34 results on '"C. Videbaek"'
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2. Fourth meeting of the European Neurological Society 25–29 June 1994 Barcelona, Spain
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H. Hattig, C. Delli Pizzi, M. C. Addonizio, Michelle Davis, A. R. Giovagnoli, L. Florensa, M. Roth, J. de Kruijk, Francisco Lacruz, Ph. Dewailly, A. Toygar, C. Avendano, P.P. De Deyn, J. F. Hurtevent, F. Lomeila, T. W. Wong, Gordon T. Plant, M. Bud, H. J. Willison, DH Miller, D. W. Langdon, R. Cioni, J. Servan, A. Kaygisiz, E. Racadot, D. B. Schens, E. Picciola, L. Falip, C. Bouchard, J. Jotova, A. Jorge-Santamaria, P. Misra, A. Dufour, C. P. Panagopoulos, A. Venneri, B. Sredni, B. Angelard, M. Janelidze, M. Carreno, J. Obenberger, J. Pouget, H. W. Moser, R. Kaufmann, J. A. Molina, D. Linden, A. Martin Urda, E. Uvestad, A. Krone, J. P. Cochin, J. Mallecourt, A. Cambon-Thomsen, K. Violleau, P. Osschmann, A. M. Durocher, E. Bussaglia, D. M. Danielle, H. Efendi, C. Van Broeckhoven, K. G. Jordan, W. Rautenberg, C. Iniguez, J. M. Delgado, Graham Watson, M. Lawden, Gareth J. Barker, K. Stiasny, James T. Becker, G. Campanella, E. Peghi, A. Poli, A. Haddad, T. Yamawaki, Giacomo P. Comi, S. Sotgiu, B. Ersmark, A. Pomes, M. Ziegler, P. Ferrante, P. Ruppi, H. KuÇukoglu, R. Bouton, U. K. Rinne, P. Vieregge, M. Dary, P. Giunti, Peter J. Goadsby, S. Jung, E. Secor, A. Steinberg, N. Vila, M. A. Hernandez, M. Cursi, A. Enqelhardt, A. Engelhardt, J. Veitch, F. Di Silverio, F. Arnaud, B. Neundörfer, R. Brucher, Dominique Caparros-Lefebvre, B. Meyer, Marianne Dieterich, M. H. Snidaro, R. Gomez, R. Cerbo, M. Ragno, J. M. Vance, S. Nemni, A. Caliskan, F. Barros, I. Velcheva, D. Ceballos-Baumann, V. Barak, A. Avila, N. Antonova, F. Resche, S. Pappata, L. Varela, S. R. Silveira Santos, A. Cammarota, L. Naccache, Y. Nara, E. Tournier-Lasserves, R. Mobner, T. Chase, A. Ensenyat, J. Ulrich, G. Giegerich, M. Rother, M. Revilla, N. Nitschke, K. Honczarenko, E. Basart Tarrats, J. Blin, B. Jacob, J. Santamaria, S. Knezevic, J. L. Castillo, M. Antem, J. Colomer, O. Busse, Didier Hannequin, S. Carrier, J. B. Ruidavets, C. Rozman, J. Bogoussslavsky, J. Pascual Calvet, E. Monros, J. M. Polo, M. Zucconl, Javier Muruzabal, R. R. Allen, R. Rivolta, K. Haugaard, A. Nespolo, K. Hoang-Xuang, G. Bussone, T. Avramidis, E. Corsini, Christiana Franke, T. Vinogradova, H. Boot, K. Vestergaard, G. H. Jansen, N. Argentino, M. Raltzig, W. Linssen, Mark B. Pepys, P. Roblot, L. Lauritzen, E. Fainardi, D. Morin, T. X. Arbizu Urdiain, J. Wollenhaupt, S. Bostantjopoulou, G. Pavesi, A. D. Forman, Giovanni Fabbrini, D. Jean, J. J. Archelos, M. I. Blanchs, M. Del Gobbo, Anna Carla Turconi, Ch. Derouesné, Elio Scarpini, A. Visbeck, P. Castejon, J. P. Renou, F. Mounier-Vehier, G. Potagas, Ch. Duyckaerts, A. Filla, R. Schneider, G. Ronen, K. Nagata, J. P. Vedel, A. Henneberg, G. van Melle, C. Baratti, H. Knott, M. C. Prevett, A. Bes, B. Metin, Jos V. Reempts, L. Martorell, Mefkure Eraksoy, H. O. Handwerker, D. S. Younger, O. Oktem, D. Frongillo, C. Soriano-Soriano, L. Niehaus, F. Zipp, A. Tartaro, S Newman, R. H. Browne, P. Davous, R. Sanchez, M. Muros, M. E. Kornhuber, A. Lavarone, M. Mohr, M. R. Garcia, S. Russell, H. Kellar-Wood, M. R. Tola, B. Ostermeyer, Ch. Tzekov, K. Sartor, E. B. Ringelstein, P. P. Gazzaniga, Paul Krack, H. Fidaner, H. Rico, T. Dbaiss, F. Alameda, E. Torchiana, L. Rumbach, I. Charques, J. M. Bogaard, C. D. Frith, L. J. Rappelle, R. Brenner, A. Joutel, K. Fuxe, G. HÄcker, M. J. Blaser, J. Valls-SolÇ, G. Ulm, M. Alberdi, A. Bock, F. W. Bertelsmann, U. Wieshmann, J. Visa, J. R. Lupski, D. D'Amico, L. M. P. Ramos, A. A. Vanderbark, R. Horn, M. Warmuth, Dietmar Kühne, Mark S. Palmer, C. Ehrenheim, E. Canga, S. Viola, O. Scarpino, P. Naldi, R. Almeida, A. A. Raymond, J. Gamez, Stephan Arnold, A. DiGiovanni, J. Dalmau, C. C. Chari, H. F. Beer, J. C. Koetsier, J. Iriarte, E. Yunis, J. Casadevall, E. Le Guern, E. Stenager, S. R. Benbadis, J. M. Warter, F. Burklin, I. Theodorou, L. Johannesen, G. A. Graveland, X. Leclerc, I. Vecchio, L. Ozelius, G. Nicoletti, R. K. Gherardi, E. Esperet, M. L. Delodovici, F. Cattin, F. Paiau, Giorgio Sacilotto, C. A. J. Broere, D. Chavdarov, J. P. Willmer, C. H. Hawkes, Th. Naegele, E. Ellie, E. Dartigues, M. J. Guardiola, S. Hesse, Z. Levic, Marco Rovaris, P. Saugeir-Veber, B. A. Yaqub, H. F. Durwen, R. Larumbe, J. Ballabrina, M. Sendtner, J. Röther, M. Horstink, C. Kluglein, M.P. Montesi, H. Apaydin, J. Montoya, E. Waubant, Ch. Verellen-Dunoulin, A. Nicolai, J. Lopez-Delval, R. Lemon, G. Cantinho, E. Granieri, A. Zeviani, Wolfgang H. Oertel, U. Ficola, V. Di Piero, V. Fragola, K. Sabev, M. V. Guitera, I. Turki, F. Bolgert, P. Ingrand, J. M. Gobernado, L. M. E. Grimaldi, S. Baybas, B. Eymard, Y. Rolland, Y. Robitaille, Ta. Pampols, P. J. Koehler, A. Carroacedo, J. Vilchez, S. Di Vittorio, I. R. Rise, T. Nagy, M. Kuffner, E. Palazzini, A. Ott, J. Pruim, T. X. Arbizu, E. Manetti, C. Cervera, S. Felber, G. Gursoy, J. Scholz, G. A. Buscaino, M. S. Chen, A. Pascual, J. Hazan, J. U. Gajda, J. G. Cea, G. Bottini, G. Damalik, F. Le Doze, G. Bonaldi, J. M. Hew, C. Messina, A. M. Kennedy, J. M. Carney, N. M. F. Murray, M. Parent, M. Koepp, V. Dimova, D. De Leo, K. Jellinger, G. Salemi, S. Mientus, M. L. Hansen, F. Mazzucchelli, J. Vieth, M. Mauri, E. Bartels, L. Johannsen, C. Humphreys, J. Emile, D. N. Landon, E. Kansu, R. Sanchez-Pernaute, Rsj Frackowiak, M. Gonzalez Torres, L. Oller, C. Machedo, J. Kother, M. Billiard, H. Durak, T. Schindler, A. Frank, A. Uncini, A. Sbriccoli, C. Farinas, D. W. Paty, N. Fast, A. T. Zangaladze, A. Kerkhofs, J. M. Pino Garcia, I. De la Fuente, B. Marini, L. Gomez, I. Rubio, Alessandra Bardoni, C. Brodie, P. Acin, U. Sliwka, S. A. Hawkins, S. Tardieu, F. Vitullo, J. M. Pereira Monteino, R. Gagliardi, T. Jezewski, A. Cano, T. Lempert, F. Abad Alegria, G. Rotondo, D. Ince, C. Martinez Parra, Y. Huang, H. Luders, Y. Steinvil, F. G. A. Van Der Meche, R. Bianchi, A. Sanchez, T. Sevilla, J. M. Ketelslegers, A. Domzal-Stryga, M. Pandolfo, M. O. Josse, K. W. Neff, I. Blanco, G. W. Bruyn, O. W. Witte, J. L. Thibault, G. Andersen, J. Pariset, A. Marcone, R. J. M. Lane, A. Hofman, M. Verin, T. Matilla, P. Bedoucha, J. Roche, M. Lai, M. Collard, A. Ugarte, F. Gallecho, D. Silbersweig, C. Kennard, J. P. Azulay, T. W. Ho, P. L. I. Dellemijn, R. Girardello, F. Baas, B. Voss, F. Rozenberg, E. M. Brocker, V. Stanev, A. A. J. Soeterboek, A. Marra, A. Rey, E. Ertem, M. Sawradewicz-Rybak, J. De Keyser, P. Cavallari, F. Proust, Y. Chevalier, H. C. Hansen, D. Leys, C. A. Davie, K. Hoang-Xuan, C. Bairati, H. van Crevel, Thomas T. Warner, B. Bompais, A. Dobbeleir, T Campbell, C. Macko, C. J. M. Klijn, M. Dussallant, T. P. Berlit, W. Rozenbaum, M. J. van den Bent, W. A. Rocca, M. Muller, H. Hundemer, U. Zifko, M. Campera, F. Drislane, D. Ranoux, T. M. Kloss, Anil Kumar, I. Ruolt, C. Bargnani, B. Marescau, N. A. Losseff, S. Notermans, B. Kint, E. T. Burke, C. Aykut, J. Matias Guiu, P. Maquet, T. Drogendijk, M. Leone, K. von Ammon, M. Pepeliarska, C. Prados, L. DiGiamberardino, T. Logtenberg, G. Lenoir, I. Castaldo, Damhaut, M. Radionova, G. Sirabian, R. Navon, Giovanni Antonini, K. Al Moutaery, E. Chamas, R. Schönhuber, M. Giannini, B. Debilly, I. Labatut, H. Henon, J. A. Egido, M. Baudrimont, J. N. Lorenzo, J. E. C. Bromberg, R. Antonacci, J. J. Vilchez, T. Moulin, B. Rautenstrauss, Giovanni Meola, J. Noth, S Mammi, P. Laforet, F. Lopez, C. Gehring, S. Bort, G. Rancurel, D. Decamps, S. Kostadinova, Y. Shapira, B. Neundoerfer, D. Chavrot, M. Solimena, J. P. Salier, W. Deberdt, R. Hoff-Jörgensen, A. Messina, S. Meairs, G. Rosoklija, E. Nelis, I. Bertran, C. Ertekin, J. Lohmeyer, Mitermayer Galvao dos Reis, L. Calo, E. Maccagnano, A. P. Hays, J. Verlooy, M. G. Forno, T. Blanco, L. Bail, Gabriella Silvestri, J. Montero, F. Bertrand, R. T. Ghnassia, C. Besses, T. Sereghy, F. Shalit, G. Bogliun, S. Braghi, St. Baykouchev, C. Franke, A. Lasa, L. C. Archard, J. Kriebel, S. Shaunak, M. Nocito, Alexander Tsiskaridze, E. Manfredini, T. Seigal, David G. Gadian, M. Barlas, J. D. Degos, C. Seeber, J. Caemert, J. L. Mas, R. B. Pepinsky, M. G. D'Angelo, N. Baumann, S. Yorifuji, H. P. Endtz, M. A. Cassatella, R. A. C. Hughes, V. Golzi, A. Bittencourt, A. Ferreira, M. Sanson, C. Alper, M. Vermeulen, M. A. A. van Walderveen, E. Alexiou, C. H. Lucas, M. Fiorelli, Y. N. Debbink, R. Gil, S. Congia, T. Banerjee, J. M. Bouchard, A. N. Pinto, A. Ceballos-Baumann, G. Grollier, P. I. M. Schmitz, M. D. Catata, N. Lahat, N. S. Rao, P. Papathanasopoulos, J. Valls-Solé, D. Claus, G. Schroter, A. Castro, C. Videbaek, R. Martinez Dreke, A. D. Platts, M. Hermesl, A. C. PeÇanha-Martins, M. Cardoso Silva, P. Masnou, M. J. A. Tanner, Ch. Confavreux, B. Mishu, H. Rasmussen, L. Valenciano, Carlo Pozzilli, S. W. Li, V. Salzman, Y. Vashtang, Massimo Franceschi, M. Severo, G. Deuschl, S. Setien, G. Mariani, A. Protti, J. Castillo, M. J. B. Taphoorn, M. Frontali, I. Milonas, D. Decoq, J. A. Navarro, S. Castellvi-Pel, C. Ertikin, M. Urtasun, Y. Lajat, B. E. Kendall, E. Verdu, B. Gueguen, E. Boisen, R. Couderc, A Danek, JM Stevens, F. Nicoli, L. Feltri, M. L. Vazquez-Andre, J. A. Morgan-Hughes, L. D'Angelo, F. Y. Liew, L. F. Pascual, J. Patrignani Ochoa, Vittorio Martinelli, J. Cophignon, L. Zhang, S. Martin, J. F. Meder, H. C. Buschmann, L. Bertin, J. van Gijn, A. Barreiro, A. Cools, C. Leon, A. Berod, E. A. Anllo, E. Zanette, L. Petrov, R. Barona, B. Gallicchio, P. J. Cozzone, N. Diederich, G. Cancel, L. Schelosky, P. Orizaola, K. Yulug, S. Ozer, Valeria A. Sansone, B. Guiraud-Chaumeil, K. Voigt, P. Labauge, M. Eoli, J. Zhu, J. Aguirre, M. Ferrarini, B. Zyluk, E. Planas, A. Cadilha, C. Tortorella, H. Bismuth, C. E. Counsell, A. Laun, A. Ferlini, Rio J. Montalban, N. Biary, L. Becker, M. Fardeau, M. Poloni, V. M. S. de Bruin, C. Fornada, J. Barros, E. Ganzmann, E. Touze, D. Wallach, J. Peila, H. Fujimura, M. T. Iba-Zizen, G. Macchi, C. Villoslada, R. Gouider, Ph. Rondepierre, P. Grummich, P. Chiodi, C. Conte, M. Michels, P. Annunziata, G. Semana, C. Sommer, J. Vajsar, D. Zekin, J. Kulisevsky, David G. Munoz, B. Jacotot, M. Magoni, A. Luxen, T. Garcia-Silva, S. Di Cesare, Christophe Tzourio, M. Gomori, I. Picomell, L. Santoro, F. Villa, Giovanni Pennisi, T. Ribalta, J. M. Molto, L. Marzorati, P. Loiseau, F. Gemignani, A. Gironell, J. Wissel, A. Prusinski, F. Cailloux, P. Villanueva-Hemandez, P. Cozzone, T. Del Ser, J. Sans-Sabrafen, M. Zappia, P. W. A. Willems, G. Tchernia, D. Gardeur, R. Bauer, F. Palomo, H. Metz, S. Lamoureux, C. Chastang, I. Reinhard, A. Goldfarb, S. Harder, Jordi Río, C. Ozkara, E. Tekinsoy, P. Vontobell, J. De Recondo, M. Rabasa, L. Lacomblez, F. Boon, Dgt Thomas, V. Palma, Renato Mantegazza, A. Dervis, M. Nueckel, B. YalÇinerner, I. Duran, G. Dalla Volta, A. Zubimendi, J. Pinheiro, A. Marbini, Xavier Montalban, H. Wekerle, X. Pereira Monteino, F. Crespo, F. Koskas, N. Battistini, C. Ruiz, H. Offner, J. de Pommery, P. Kanovsky, J. Y. Barnett, J. Pardo, G. Tomei, R. Rene, H. M. Lokhorst, P. Thajeb, H. Bilgin, D. McGehee, R. Fahsold, L. Morgante, Katie Sidle, C. Delwaide, M. N. Diaye, P. H. Rice, A. Creange, C. Sabev, K. Stephan, K. WeilBenborn, G. Magnani, L. Grymonprez, F. Cardellach, M. Kaps, N. G. Meco, F. Vega, V. Bonifati, A. Desomer, M. Baldy-Moulinier, G. Kvale, F. J. Authier, B. Yegen, T. Ho, J. M. Rozet, E. A. Cabanis, L. Bruce, L. Ambrosoli, M. A. Petrella, M. Hernandez, P. Timmings, H. B. van der Worp, F. Mahieux, A. Urbano-Marquez, D. A. Krendel, A. A. Garcia, R. Divari, R. Michalowicz, M. R. Piedmonte, M. Bondavalli, M. Zanca, P. F. Ippel, Onofre Combarros, B. Tavitian, E. Hirsch, I. Anastasopoulos, A. Roses, A. Köhler, P. Vienna, V. Timmerman, P. Sergi, F. Cornelio, A. Di Pasquale, R. Verleger, S. Castellvirel, J. Proano, B. van Moll, F. Rubio, W. Hacke, I. Lavenu, L. Zetta, M. W. Tas, N. Bittmann, M. Bonamini, O. R. Hommes, V. Dousset, N. Afsar, S. Belal, R. R. Myers, J. Goes, Giuseppe Vita, E. Clementi, V. G. Karepov, M. Jueptner, A Vincent, P. Emmrich, Th. Heb, A. Caballo, J. Gallego, T. Mokrusch, C. Perla, L. Gebuhrer, O. Titlbach, Alessandro Prelle, A. Czlonkowska, M. Russo, D. Hadjiev, T. S. Chkhikvishvili, M. Oehlschlager, G. Becker, I. Günther, E. N. Stenager, J. Garcia Agundez, J. Casademont, J. Batlle, S. Podobnik-Sarkanji, C. Alonso-Villaverde, B. Delaguillaume, B. Genc, B. Mazoyer, A. Rodriguez-Al-barino, Ch. Hilger, B. Ferrero, R. Price, W. Grisold, L. Fuhry, D. Oulbani, D. Ewing, A. Petkov, W. Walther, A. Gokyigit, John Newsom-Davis, J. Tayot, D. Seliak, G. Pelliccioni, D. Campagne, K. Kessler, F. Boureau, D. Perani, J. P. N'Guyen, N. Tchalucova, B. A. Antin-Ozerkis, C. Lacroix, B. D. Aronovich, I. H. Jenkins, E. A. dos Reis, M. Hortells, H. M. Meinck, H. Ch. Buschmann, S. C. J. M. Jacobs, T. Wetter, P. Creissard, N. Martinez, J. Weidenfeldl, H. J. Sturenburg, G. Damlacik, V. Gracia, J. C. Turpin, A. Pou-Serradell, J. P. Vincent, T. Gagoshidze, U. Ozkutlu, M. McLeod, K. Siegfried, I. Tchaoussoglou, J. Hildebrand, S. Kowalska, M. C. Picot, G. Galardin, L. Crevits, F. Andreetta, S. Larumbe-Lobalde, G. de la Sierra, J. C. Alvarez-Cermeno, R. J. Seitz, P. L. Oey, L. Ptacek, A. M. J. Paans, A. Wirrwar, A. Schmied, J. Uilchez, H. Tounsi, D. Hipola, V. Avoledo, Y. Hirata, P. Vermersch, T. M. Aisonobe, J. Valls-SoIè, H. Staunton, J. Dichgans, R. Karabudak, I. Dones, G. Porta, E. Janssens, Maria Martinez, J. M. Fernandez-Real, R. Villagra, Y. Yoshino, C. Kabus, K. Schimrigk, I. Girard-Buttaz, F. Piccoli, F. Aichner, P. Zuchegna, S. M. Al Deeb, F. Bono, N. Busquets, A. Jobert, Patrizia Ciscato, M. Martin, L. Polman, S. Darbra, V. Le Cam-Duchez, F. Baldissera, B. Baykan-Kurt, D. Guez, M. Bratoeva, H. Matsui, M. Mila, H. Perron, L. Bjorge, G. Husby, Steven T. DeKosky, D. R. Cornblath, J. M. Gabriel, J. J. Poza, Y. Wu, A. Toscano, R. P. Kleyweg, J. Kuhnen, S. O. Confort-Gouny, A. Barcelo, A. M. Conti, C. Fiol, C. Steichen-Wiehn, J. Rodes, M. Cavenaile, C. Vedeler, M. Drlicek, C. Argentino, M. L. Peris, A. Cervello, A. Z. GinaÏ, S. Yancheva, D. Passingham, S. Aoba, D. L. Lopez, T. Rechlin, K. Sonka, L. Grazzi, V. Folnegovic-Smalc, Maurizio Moggio, S. Rivaud, F. G. I. Jennekens, C. H. Hartard, H. Meierkord, G. Stocklin, M. D. Catala, W. C. McKay, E. Salmon, C. Navarro, I. Pastor, L. Canafoglia, M. De Braekeleer, P. K. Thomas, C. Mocellini, C. Pierre-Jerome, M. C. Dalakas, P. Pollak, M. Levivier, Niall Quinn, G. E. Rivolta, Z. Tunca, H. Zeumer, J. Garcia Tena, St. Guily, P. Gaudray, Johannes Kornhuber, V. Petrunjashev, R. Montesanti, R. J. Abbott, H. Petit, G. Kiteva-Trencevska, F. Carletto, C. Ramo, I. M. Pino, P. Beau, G. F. Mennuni, F. Moschian, F. Meneghini, B. Zdziarska, B. Fontaine, C. Stephens, G. Meco, K. Reiners, G. Badlan, M. Sessa, I. Degaey, S. M. Hassan, C. Albani, F. Caroeller, M. Schroeder, G. Savettieri, A. Novelletto, R. Kurita, P. Oschmann, I. Plaza, M. Oliveres, Simone Spuler, A. Molins, M. Schwab, J. R. Kalden, C. P. Gennaula, Y. Baklan, O. Picard, J. M. Léger, B. Mokri, E. Ghidoni, M. Jacob, D. Deplanque, W. JÄnisch, C. De Andres, P. De Deyn, G. Guomundsson, B. Herron, J. Barado, J. L. Gastaut, Guglielmo Scarlato, F. Poron, Nicola Jones, H. Teisserenc, C. P. Hawkins, A. J. Steck, H. C. Chandler, S. Blanc, J. H. Faiss, Jm. Soler Insa, I. Sarova-Ponchas, M. Malberin, A. Sackmann, G. De Vuono, K. Kaiser-Rub, K. Badhia, E. Szwabowska-Orzeszko, S. Ramm, C. Jodice, G. Franck, J. Marta-Moreno, R. Sciolla, C. Fritz, A. Attaccalite, F. Weber, E. Neuman, M. Cannata, A. Rodriguez, I. Nachainkin, R. Raffaele, T. S. Yu, N. Losseff, E. Fabrizio, C. Khati, M. Keipes, M. P. Ortega, M. Ramos-Alvarez, E. Brambilla, A. Tarasov, K. H. Wollinsky, O. B. Paulson, F. Boller, G. Bozzato, H. Wagnur, R. Canton, D. Testa, E. Kutluaye, M. Calopa, D. Smadja, G. Malatesta, F. Baggi, A. Stracciari, G. Daral, G. Avanzini, J. Perret, J. Arenas, P. Boon, I. Gomes, A. Vortmeyer, P. Cesaro, S. Venz, E. Bernd Ringelstein, N. Milani, D. Laplane, P. Seibel, E. Tournier-Lasserve, Alexis Brice, L. Motti, E. Wascher, R. J. Abbot, F. Miralles, A. Turon, P. De Camilli, G. Luz, G. C. Guazzi, S. Tekin, F. Lesoin, T. Kryst, N. Lannoy, F. Gerstenbrand, S. Ballivet, H. A. M. van Diemen, J. Lopez-ArLandis, P. Bell, A. Silvani, M. A. Garcia, S. Vorstrup, D. Langdon, S. Ueno, B. Sander, V. Ozurk, C. Gurses, P. Berlit, J. M. Martinez-Lage, M. Treacy, S. O. Rodiek, S. Cherninkova, J. Grimaud, P. Marozzi, K. Hasert, S. Goldman, S. H. Ingwersen, A. Taghavy, T. Roig, R. Harper, I. Sarova-Pinchas, Anthony H.V. Schapira, R. Lebtahi, A. Vidaller, B. Stankov, D. Link, J. p. Malin, V. Petrova, Ludwig Kappos, J. L. Ochoa, T. Torbergsen, M. Carpo, M. Donato, Simon Shorvon, J. Mieszkowski, J. Perez-Serra, Raymond Voltz, G. Comi, S. Rafique, A. Perez-Sempere, N. Khalfallah, S. Bailleul, M. Borgers, S. Banfi, S. Mossman, A. Laihinen, G. Filippini, R. A. Grunewald, E. Stern, H. D. Herrmann, A. G. Droogan, P. Xue, A. Grilo, L. La Mantia, J. H. J. Wokke, S. Pizzul, Kie Kian Ang, S. Rapaport, W. Szaplyko, B. Romero, P. Brunet, A. 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Navasa, J. Ballabriga, G. Broggi, T. Gudeva, C. Rose, J. Vion-Dury, J. A. Gastaut, J. Pniewski, Nicola J. Robertson, G. Kohncke, M. Billot, S. Gok, E. Castellli, F. Denktas, P. Bazzi, F. Spinelli, I. F. Moseley, C. D. Mardsen, B. Barbiroli, O. M. Koriech, A. Miller, Hiroaki Yoshikawa, F. X. Borruat, J. Zielasek, P. Le Coz, J. Pascual, A. Drouet, L. T. Giron, F. Schondube, R. Midgard, M. Alizadeh, M. Liguori, Lionel Ginsberg, L. Harms, C. Tilgner, G. Tognoni, F. Molteni, Mar Tintoré, M. Psylla, C. Goulon-Goeau, M. V. Aguilar, Massimo Filippi, K. H. Mauritz, Thomas V. Fernandez, C. Basset, S. Rossi, P. Meneses, B. Jandolo, T. Locatelli, D. Shechtcr, C. Magnani, R. Ferri, Bruno Dubois, J. M. Warier, S. Berges, F. Idiman, M. Schabet, R. R. Diehl, P. D'aurelio, M. Musior, Reinhard Hohlfeld, P. Smeyers, M. Olivé, A. Riva, C. A. Broere, N. Egund, S. Franceschetti, V. Bonavita, Nicola Canal, E. Timmermans, M. Ruiz, S. Barrandon, G. Vasilaski, B. Deweer, L. Galiano, S. F. T. M. de Bruijn, L. Masana, A. Goossens, B. Heye, K. Lauer, Heinz Gregor Wieser, Stephen R. Williams, B. Garavaglia, A. P. Sempere, F. Grigoletto, P. Poindron, R. Lopez-Pajares, I. Leite, T. A. McNell, C. Caucheteur, J. M. Giron, A. D. Collins, P. Freger, J. Sanhez Del Rio, D. A. Harn, K. Lindner, S. S. Scherer, G. Serve, M. Juncadella, X. Estivill, R. Binkhorst, M. Anderson, B. Tekinsoy, C. Sagan, T. Anastopoulos, G. Japaridze, S. Guillou, F. Erminio, Jon Sussman, P. G. Oomes, D. S. Rust, S. Mascheroni, O. Berger, M. Peresson, K. V. Toyka, T. W. Polder, M. Huberman, B. Arpaci, H. Ramtami, I. Martinez, Ph. Violon, P. P. Gazzaniga Pozzill, R. Ruda, P. Auzou, J. Parker, S. P. Morrissey, Jiahong Zhu, F. Rotondi, P. Baron, W. Schmid, P. Doneda, M. Spadaro, M. C. Nargeot, I. Banchs, J.S.P. van den Berg, R. Ferrai, M. Robotti, M. Fredj, Pedro M. Rodríguez Cruz, B. Erne, D. G. Piepgras, M. C. Arne-Bes, J. Escudero, C. Goetz, A. R. Naylor, M. Hallett, O. Abramsky, E. Bonifacio, L. E. Larsson, R. Pellikka, P. Valalentino, D. Guidetti, B. Buchwald, C. H. Lücking, D. Gauvreau, F. Pfaff, A. Ben Younes-Chennoufi, R. Kiefer, R. Massot, K. A. Hossmann, L. Werdelin, P. J. Baxter, U. Ziflo, S. Allaria, C. D. Marsden, M. Cabaret, S. P. Mueller, E. Calabrese, R. Colao, S. I. Bekkelund, M. Yilmaz, O. Oktem-Tanor, R. Gine, M. E. Scheulen, J. Beuuer, A. Melo, Z. Gulay, M. D. Have, C. Frith, D. Liberati, J. Gozlan, P. Rondot, Ch. Brunholzl, M. Pocchiari, J. Pena, L. Moiola, C. Salvadori, A. Cabello, T. Catarci, S. Webb, C. Dettmers, N. A. Gregson, Alexandra Durr, F. Iglesias, U. Knorr, L. Ferrini-Strambi, F. Kruggel, P. Allard, A. Coquerel, P. Genet, F. Vinuels, C. Oberwittler, A. Torbicki, P. Leffers, B. Renault, B. Fauser, C. Ciano, G. Uziel, J. M. Gibson, F. Anaya, C. Derouesné, C. N. Anagnostou, M. Kaido, W. Eickhoff, G. Talerico, M. L. Berthier, A. Capdevila, M. Alons, D. Rezek, E. Wondrusch, U. Kauerz, D. Mateo, M. A. Chornet, Holon, N. Pinsard, I. Doganer, E. Paoino, H. Strenge, C. Diaz, J. R. Brasic, W. Heide, I. Santilli, W. M. Korn, D. Selcuki, M. J. Barrett, D. Krieger, T. Leon, T. Houallah, M. Tournilhac, C. Nos, D. Chavot, F. Barbieri, F. J. Jimenez-Jimenez, J. Muruzabal, K. Poeck, A. Sennlaub, L. M. Iriarte, L. G. Lazzarino, C. Sanz, P. A. Fischer, S. D. Shorvon, R. Hoermann, F. Delecluse, M. Krams, O. Corabianu, F. H. Hochberg, Christopher J. Mathias, B. Debachy, C. M. Poser, L. Delodovici, A. Jimenez-Escrig, F. Baruzzi, F. Godenberg, D. Cucinotta, P. J. Garcia Ruiz, K. Maier-Hauff, P. R. Bar, R. Mezt, R. Jochens, S. Karakaneva, C. Roberti, E. Caballero, Joseph E. Parisi, M. Zamboni, T. Lacasa, B. Baklan, J. C. Gautier, J. A. Martinez-Matos, W. Pollmann, G. Thomas, L. Verze, E. Chleide, R. Alvarez Sala, I. Noel, E. Albuisson, O. Kastrup, S. I. Rapoport, H. J. Braune, H. Lörler, M. Le Merrer, A. Biraben, S. Soler, S. J. Taagholt, U. Meyding-Lamadé, K. Bleasdale-Barr, Isabella Moroni, Y. Campos, J. Matias-Guiu, G. Edan, M. G. Bousser, John B. Clark, J. Garcia de Yebenes, N. K. Olsen, P. Hitzenberger, S. Einius, Aj Thompson, Ch. J. Vecht, T. Crepin-Leblond, Klaus L. Leenders, A. Di Muzio, L. Georgieva, René Spiegel, K. Sabey, D. Ménégalli, J. Meulstee, U. Liszka, P. Giral, C. Sunol, J. M. Espadaler, A. D. Crockar, K. Varli, G. Giraud, P. J. Hülser, A. Benazzouz, A. Reggio, M. Salvatore, K. Genc, M. Kushnir, S. Barbieri, J. Ph. Azulay, M. Gianelli, N. Bathien, A. AlMemar, F. Hentati, I. Ragueneau, F. Chiarotti, R. C. F. Smits, A. K. Asbury, F. Lacruz, B. Muller, Alan J. Thompson, Gordon Smith, K. Schmidt, C. Daems Monpeun, Juergen Weber, A. Arboix, G. R. Fink, A. M. Cobo, M. Ait Kaci Ahmed, E. Gencheva, Israel-Biet, G. Schlaug, P. De Jonghe, Philip Scheltens, K. Toyka, P. Gonzalez-Porque, A. Cila, J. M. Fernandez, P. Augustin, J. Siclia, S. Medaglini, D. E. Ziogas, A. Feve, L. Kater, G. J. E. Rinkel, D. Leppert, Rüdiger J. Seitz, S. Ried, C. Turc-Carel, G. Smeyers, F. Godinho, M. Czygan, M. Rijntjes, E. Aversa, M. Frigo, Leif Østergaard, J. L. Munoz Blanco, A. Cruz-Matinez, J. De Reuck, C. Theillet, T. Barroso, V. Oikonen, Florence Lebert, M. Kilinc, C. Cordon-Cardon, G. Stoll, E. Thiery, F. Pulcinelli, J. Solski, M. Schmiegelow, L. J. Polman, P. Fernandez-Calle, C. Wikkelso, M. Ben Hamida, M. Laska, E. Kott, W. Sulkowski, C. Lucas, N. M. Bornstein, D. Schmitz, M. W. Lammers, A. de Louw, R. J. S. Wise, P. A. van Darn, C. Antozzi, P. Villanueva, P. H. E. Hilkens, C. Constantin, W. Ricart, A. Wolf, M. Gamba, P. Maguire, Alessandro Padovani, B. M. Patten, Marie Sarazin, H. Ackermann, L. Durelli, S. Timsit, Sebastian Jander, B. W. Scheithauer, G. Demir, J. P. Neau, P. Barbanti, A. Brand, N. AraÇ, V. Fischer-Gagnepain, R. Marchioli, G. Serratrice, C. Maugard-Louboutin, G. T. Spencer, D. Lücke, G. Mainardi, K. Harmant Van Rijckevorsel, G. B. Creel, R. Manzanares, Francesco Fortunato, A. May, J. Workman, K. Johkura, E. Fernandez, Carlo Colosimo, L. Calliauw, L. Bet, Félix F. Cruz-Sánchez, M. Dhib, H. Meinardi, F. Carrara, J. Kuehnen, C. Peiro, H. Lassmann, K. Skovgaard Olsen, A. McDonald, L. Sciulli, A. Cobo, A. Monticelli, B. Conrad, J. Bagunya, J. Benitez, V. Desnizza, B. Dupont, O. Delrieu, D. Moraes, J. J. Heimans, F. Garcia Rio, M. Matsumto, A. Fernandez, R. Nermni, R. Chalmers, M. J. Marchau, F. Aguado, P. Velupillai, P. J. Martin, P. Tassan, V. Demarin, A. Engelien, T. Gerriets, Comar, J. L. Carrasco, J. P. Pruvo, A. Lopez de Munain, D. Pavitt, J. Alarcon, Chris H. Polman, B. Guldin, N. Yeni, Hartmut Brückmann, N. Wilczak, H. Szwed, R. Causaran, G. Kyriazis, M. E. Westarp, M. Gasparini, N. Pecora, J. M. Roda, E. Lang, V. Scaioli, David R. Fish, D. Caputo, O. Gratzl, R. Mercelis, A. Perretti, G. Steimetz, I. Link, C. Rigoletto, A. Catafau, G. Lucotte, M. Buti, G. Fagiolari, A. Piqueras, C. Godinot, J. C. Meurice, Erodriguez J. Dominigo, F. Lionnet, H. Grzelec, David J. Brooks, P. M. G. Munro, F. X. Weilbach, M. Maiwald, W. Split, B. Widjaja-Cramer, V. Ozturk, J. Colas, E. Brizioli, J. Calleja, L. Publio, M. Desi, R. Soffietti, P. Cortinovis-Tourniaire, E. F. Gonano, G. Cavaletti, S. Uselli, K. Westerlind, H. Betuel, C. O. Dhiver, H. Guggenheim, M. Hamon, R. Fazio, P. Lehikoinen, A. Esser, B. Sadzot, G. Fink, Angelo Antonini, D. Bendahan, V. Di Carlo, G. Galardi, A. F. Boller, M. Aksenova, Del Fiore, V. de la Sayette, H. Chabriat, A. Nicoletti, A. Dilouya, M. L. Harpin, E. Rouillet, J. Stam, A. Wolters, M. R. Delgado, Eduardo Tolosa, G. Said, A. J. Lees, L. Rinaldi, A. Schulze-Bonhage, MA Ron, C. Lefebvre, E. W. Radü, R. Alvarez, M. L. Bots, P. Reganati, S. Palazzi, A. Poggi, N. J. Scolding, V. Sazdovitch, T. Moreau, E. Maes, M. A. Estelies, P. Petkova, Jose-Felix Marti-Masso, G De La Meilleure, N. Mullatti, M. Rodegher, N. C. Notermans, T. A. T. Warner, S. Aktan, J. P. Louboutin, L. Volpe, C. Scheidt, W. Aust, C. M. Wiles, U. Schneider, S. K. Braekken, W. R. Willems, K. Usuku, Peter M. Rothwell, C. Talamon, M. L. Sacchetti, A. Codina, M. H. Marion, A. Santoro, J. Roda, A. Bordoni, D. J. Taylor, S. Ertas, H. H. Emmen, J. Vichez, V. BesanÇon, R. E. Passingham, M. L. Malosio, A. Vérier, M. Bamberg, A. W. Hansen, E. Mostacero, G. Gaudriault, Marie Vidailhet, B. Birebent, K. Strijckmans, F. Giannini, T. Kammer, I. Araujo, J. Nowicki, E. Nikolov, A. Hutzelmann, R. Gherardi, J. Verroust, L. Austoni, A. Scheller, A. Vazquez, S. Matheron, H. Holthausen, J. M. Gerard, M. Bataillard, S. Dethy, V. H. Patterson, V. Ivanez, N. P. Hirsch, F. Ozer, M. Sutter, C. Jacomet, M. Mora, Bruno Colombo, A. Sarropoulos, T. H. Papapetropoulos, M. Schwarz, D. S. Dinner, N. Acarin, B. Iandolo, J. O. Riis, P. R. J. Barnes, F. Taroni, J. Kazenwadel, L. Torre, A. Lugaresi, I. L. Henriques, S. Pauli, S. Alfonso, Pedro Quesada, A. S. T. Planting, J. M. Castilla, Thomas Gasser, M. Van der Linden, A. Alfaro, E. Nobile-Orazio, G. Popova, W. Vaalburg, F. G. A. van der Mech, L. Williams, F. Medina, J. P. Vernant, J. Yaouanq, B. Storch-Hagenlocher, A. Potemkowski, R. Riva, M. H. Mahagne, M. Ozturk, Ve. Drory, N. Konic, C. Jungreis, A. Pou Serradell, J. L. Gauvrit, G. J. Chelune, S. Hermandez, T. Dingus, L. Hewer, Ch. Koch, M. N. Metz-Lutz, G. Parlato, M. Sinaki, Charles Pierrot-Deseilligny, H. C. Diener, J. Broeckx, J. Weill-Fulazza, M. L. Villar, M. Rizzo, O. Ganslandt, C. Duran, N. A. Fletcher, G. Di Giovacchino, Susan T. Iannaccone, C. Kolig, N. Fabre, H. A. Crockard, Rita Bella, M. Tazir, E. Papagiannuli, K. Overgaard, Emma Ciafaloni, I. Lorenzetti, F. Viader, P. A. H. Millac, I. Montiel, L. H. Visser, M. Palomar, P. L. Murgia, H. Pedersen, Rafael Blesa, S. Seddigh, W. O. Renier, I. Lemahieu, H. M. L. Jansen, L. Rosin, J. Galofre, K. Mattos, M. Pondal, G. M. Hadjigeorgiou, D. Francis, L. Cantin, D. Stegeman, M. Rango, A. B. M. F. Karim, S. Schraff, B. Castellotti, I. Iriarte, E. Laborde, T. J. Tjan, R. Mutani, D. Toni, B. Bergaasco, J. G. Young, C. Klotzsch, A. Zincone, X. Ducrocq, M. Uchuya, O. J. Kolar, A. Quattrone, T. Bauermann, Nereo Bresolin, J. Vallée, B. C. Jacobs, A. Campos, Werner Poewe, J. A. Villanueva, A. W. Kornhuber, A. Malafosse, E. Diez-Tejedor, G. Jungreia, M. J. A. Puchner, A. Komiyama, O. Saribas, V. Volpini, L. Geremia, S. Bressi, A. Nibbio, Timothy E. Bates, T. z. Tzonev, E. Ideman, G. A. Damlacik, G. Martino, G. Crepaldi, T. Martino, Kjell Någren, E. Idiman, D. Samuel, J. M. Perez Trullen, Y. van der Graaf, J. O. Thorell, M. J. M. Dupuis, E. Sieber, R. D'Alessandro, C. Cazzaniga, J. Faiss, A. Tanguy, A. Schick, I. Hoksergen, A. Cardozo, R. Shakarishvili, G. K. Wennlng, J. L. Marti-Vilalta, J. Weissenbach, I. L. Simone, Amalia C. Bruni, Darius J. Adams, C. Weiller, A. Pietrangeli, F. Croria, C. Vigo-Pelfrey, Patricia Limousin, A. Ducros, G. Conti, O. Lindvall, E. Richter, M. Zuffi, A. Nappo, T. Riise, J. Wijdenes, M. J. Fernandez, J. Rosell, P. Vermersh, S. Servidei, M. S. C. Verdugo, F. Gouttiere, W. Solbach, M. Malbezin, I. S. Watanabe, A. Tumac, W. I. McDonald, D. A. Butterfield, P. P. Costa, F. deRino, F. Bamonti, J. M. Cesar, C. H. Lahoz, I. Mosely, M. Starck, M. H. Lemaitre, K. M. Stephan, S. Tex, R. Bokonjic, I. Mollee, L. Pastena, M. Gutierrez, F. Boiler, M. C. Martinez-Para, M. Velicogna, O. Obuz, A. Grinspan, M. Guarino, L. M. Cartier, E. Ruiz, D. Gambi, S. Messina, M. Villa, Michael G. Hanna, J. Valk, Leone Pascual, M. Clanet, Z. Argov, B. Ryniewicz, E. Magni, B. Berlanga, K. S. Wong, C. Gellera, C. Prevost, F. Gonzalez-Huix, R. Petraroli, J. E. G. Benedikz, I. Kojder, C. Bommelaer, L. Perusse, M. R. Bangioanni, Guy M. McKhann, A. Molina, C. Fresquet, E. Sindern, Florence Pasquier, M. J. Rosas, M. Altieri, O. Simoncini, M. Koutroumanidis, C. A. F. Tulleken, M. Dary-Auriol, S. Oueslati, H. Kruyer, I. Nishisho, C. R. Horning, A. Vital, G. V. Czettritz, J. Ph. Neau, B. Mihout, A. Ameri, M. Francis, S. Quasthoff, D. Taussig, S. Blunt, P. Valentin, C. Y. Gao, O. Heinzlef, H. d'Allens, C. Coudero, M. Erfas, G. Borghero, P. J. Modrego Pardo, M. C. Patrosso, N. L. Gershfeld, P. A. J. M. Boon, O. Sabouraud, M. Lara, J. Svennevig, G. L. Lenzi, A. Barrio, H. Villaroya, JosÇ M. Manubens, O. Boespflug-Tanguy, M. Carreras, D. A. Costiga, J. P. Breux, S. Lynn, C. Oliveras Ley, A. G. Herbaut, J. Nos, C. Tornali, Y. A. Hekster, J. L. Chopard, J. M. Manubens, P. Chemouilli, A. Jovicic, F. Dworzak, S. Smirne, S. E. Soudain, B. Gallano, D. Lubach, G. Masullo, G. Izquierdo, A. Pascual Leone Pascual, A. Sessa, V. Freitas, O. Crambes, L. Ouss, G. W. Van Dijk, P. Marchettini, P. Confalonieri, M. Donaghy, A. Munnich, M. Corbo, and M. E. L. van der Burg
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Neurology ,business.industry ,Media studies ,Library science ,Medicine ,Neurology (clinical) ,business - Published
- 1994
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3. Thrombolytic therapy in acute ischemic stroke. A Danish pilot study
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Ellemann K, Tom Skyhøj Olsen, C Videbaek, Gam J, Peter Arlien-Søborg, A Karle, Gudrun Boysen, H Pedersen, B Sperling, and Karsten Overgaard
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Adult ,Male ,Denmark ,medicine.medical_treatment ,Ischemia ,Pilot Projects ,Brain Ischemia ,Central nervous system disease ,medicine.artery ,medicine ,Humans ,Thrombolytic Therapy ,Infusions, Intravenous ,Stroke ,Aged ,Advanced and Specialized Nursing ,Chemotherapy ,medicine.diagnostic_test ,business.industry ,Vascular disease ,Brain ,Middle Aged ,medicine.disease ,Recombinant Proteins ,Cerebral Angiography ,Cerebral blood flow ,Regional Blood Flow ,Tissue Plasminogen Activator ,Anesthesia ,Injections, Intravenous ,Angiography ,Middle cerebral artery ,Feasibility Studies ,Female ,Neurology (clinical) ,Tomography, X-Ray Computed ,Cardiology and Cardiovascular Medicine ,business - Abstract
In a feasibility and safety study of thrombolytic therapy in acute ischemic stroke, we explored the usefulness of measurements of regional cerebral blood flow. Twenty-three patients with acute ischemic stroke were treated with 100 mg recombinant tissue plasminogen activator infused intravenously over 1 hour. Thrombolytic therapy was initiated 78 to 355 minutes after onset of symptoms. Angiography 16 to 24 hours after treatment in 17 patients showed patient intracranial arteries in 12, partial occlusion of the middle cerebral artery in 3, and total occlusion of the middle cerebral artery in 2. rCBF with 99mTc-hexamethylpropyleneamine oxime intravenously was measured 5 minutes before and within 24 hours after thrombolytic therapy in 12 patients. 10 of the 12 patients showed brain tissue reperfusion and 2, with angiographically documented middle cerebral artery occlusion, showed no reperfusion, thus documenting a relationship between reperfusion measured by regional cerebral blood flow and angiographic patency (P = .015). Three patients died. Patients who were reperfused within 24 hours (documented by repeated regional cerebral blood flow measurements) showed greater clinical improvement on the Scandinavian Stroke Scale the sooner their thrombolytic therapy was started and the more severe their neurological deficits. Acute cerebral ischemia can be documented by rCBF measurements without delay of thrombolytic therapy, and repeated rCBF measurements can reveal whether cerebral reperfusion has occurred. In our study, early reperfusion was associated with clinical improvement.
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- 1993
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4. SPECT tracer [(123)I]IBZM has similar affinity to dopamine D2 and D3 receptors
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C, Videbaek, K, Toska, M A, Scheideler, O B, Paulson, and G, Moos Knudsen
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Tomography, Emission-Computed, Single-Photon ,Pyrrolidines ,Receptors, Dopamine D2 ,Cricetinae ,Benzamides ,Receptors, Dopamine D3 ,Animals ,Dopamine Antagonists ,Humans ,CHO Cells - Abstract
Emission tomography investigations of the pathophysiological involvement of the cerebral dopaminergic transmitter system in the living human brain relies heavily on a careful selection of the most suitable radioligand. In recent years, many clinical studies have employed [(123)I]IBZM in SPECT studies. The aim of the present study was to characterize the binding of IBZM to dopaminergic receptor subtypes as a means of elucidating which receptor subtypes are visualized and examined by [(123)I]IBZM. The affinity of IBZM for each of the major human dopamine receptors (D1, D2(short), D3, D4(4. 2), and D5 receptor) was determined by competitive radioligand binding assay using membranes prepared from clonal cell lines expressing the different subtypes. Radioligands with high affinity for the D1(A) and D5 receptors ([(3)H]SCH-23390), dopamine D2(short) and D4(4.2) receptors ([(3)H]Spiroperidol), and dopamine D3 receptor ([(3)H]7-OH-DPAT) were used to measure specific binding. Corresponding unlabeled displacing ligands for determination of nonspecific binding were employed. Assays were performed at 25 degrees C. These experiments show that for IBZM K(i) values were 1.6 nM for dopamine D2(s) receptors and 2.2 nM for dopamine D3 receptors. There was no binding of IBZM to D1(A), D5, or D4(4.2) receptors. In conclusion, when [(123)I]IBZM is used as SPECT tracer, the studies reflect dopaminergic D2 as well as D3 receptor binding.
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- 2000
5. Dopamine D(2) receptor quantification in extrastriatal brain regions using [(123)I]epidepride with bolus/infusion
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L H, Pinborg, C, Videbaek, G M, Knudsen, C G, Swahn, C, Halldin, L, Friberg, O B, Paulson, and N A, Lassen
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Adult ,Male ,Tomography, Emission-Computed, Single-Photon ,Pyrrolidines ,Receptors, Dopamine D2 ,Brain ,Contrast Media ,Middle Aged ,Iodine Radioisotopes ,Benzamides ,Homeostasis ,Humans ,Tissue Distribution ,Aged - Abstract
The iodinated benzamide epidepride, which shows a picomolar affinity binding to dopamine D(2) receptors, has been designed for in vivo studies using SPECT. The aim of the present study was to apply a steady-state condition by the bolus/infusion approach with [(123)I]epidepride for the quantification of striatal and extrastriatal dopamine D(2) receptors in humans. In this way the distribution volume of the tracer can be determined from a single SPECT image and one blood sample. Based on bolus experiments, an algorithm using conventional convolution arguments for prediction of the outcome of a bolus/infusion (B/I) experiment was applied. It was predicted that a B/I protocol with infusion of one-third of the initial bolus per hour would be appropriate. Steady-state conditions were attained in extrastriatal regions within 3-4 h but the infusion continued up to 7 h in order to minimize the significance of individual differences in plasma clearance and binding parameters. A steady-state condition, however, could not be attained in striatal brain regions using a B/I protocol of 20 h, even after 11 h. Under near steady-state conditions a striatal:cerebellar ratio of 23 was demonstrated. Epidepride has a unique signal-to-noise ratio compared to [(123)I]IBZM but present difficulties for steady-state measurements of striatal regions. The bolus/infusion approach is particularly feasible for quantification of the binding potential in extrastriatal regions.
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- 2000
6. S.14.01 Frontal dopamine D2-receptor binding potentials in drug-naive first-episode schizophrenic patients predict the effect of antipsychotic treatment
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T. Mackeprang, Hans Rasmussen, Claus Svarer, Birte Glenthøj, Lars H. Pinborg, L. Friberg, and C. Videbæk
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Pharmacology ,First episode ,business.industry ,Antipsychotic treatment ,Psychiatry and Mental health ,Drug-naïve ,Dopamine receptor D1 ,Neurology ,Dopamine receptor D3 ,Dopamine receptor D2 ,Medicine ,Pharmacology (medical) ,Neurology (clinical) ,business ,Biological Psychiatry ,medicine.drug - Published
- 2007
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7. Brain extraction and distribution of 99mTc-bicisate in humans and in rats
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G M, Knudsen, A R, Andersen, F E, Somnier, C, Videbaek, S, Hasselbalch, and O B, Paulson
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Adult ,Male ,Sodium Radioisotopes ,Brain ,Biological Transport ,Arteries ,Organotechnetium Compounds ,Middle Aged ,Rats ,Veins ,Blood-Brain Barrier ,Cerebrovascular Circulation ,Oximes ,Animals ,Humans ,Female ,Tissue Distribution ,Cysteine ,Rats, Wistar - Abstract
Blood-brain barrier (BBB) passage of the flow tracer ethylenediylbis-L-cystein diethylester (bicisate, ECD) was measured repeatedly in five patients by means of the intravenous (i.v.) double-indicator technique using 24Na+ as an intravascular cotracer. After i.v. injection, the arterial concentration curve of 99mTc-bicisate was delayed and dispersed compared with that of the intravascular cotracer, presumably due to lung retention of the flow tracer. The corrected cerebral venous output curves were fitted using a three-compartment model with four parameters. At resting cerebral blood flow (CBF) values, the unidirectional brain extraction was 0.57 +/- 0.05, the permeability-surface area product for passage from blood to brain (PS1) was 0.48 +/- 0.07 ml/g/min, and the distribution volume for bicisate was 0.74 +/- 0.20 (mean +/- SD). In a single patient, BBB transport after i.v. injection of bicisate was compared with that of a similar flow tracer, d,l-hexamethylpropyleneamine oxime (HM-PAO), and similar values were found for the two tracers. In 19 rats, the brain extraction of bicisate was measured by means of the intracarotid double-indicator technique. The brain extraction was measured at resting, decreased, and increased CBF values. Low CBF values were obtained by hyperventilation and high values by hypercapnia. The degree of backflux of tracer from brain to blood was evaluated by means of the three-compartment model and was found to be negligible in these experiments. The brain extraction was 0.70 +/- 0.1 and PS1 was 0.94 +/- 0.27 ml/g/min. During hypercapnia, CBF increased from 0.77 to 1.09 ml/g/min, leading to a significant decrease in brain extraction, from 0.70 to 0.56.(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1994
8. Regional cerebral blood-flow measured by HMPAO and SPECT in a 5-year-old boy with Landau-Kleffner syndrome
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S E Mouridsen, H Søgaard, C Videbaek, and A R Andersen
- Subjects
Male ,medicine.medical_specialty ,Landau–Kleffner syndrome ,Radiography ,Hemodynamics ,Electroencephalography ,Hippocampus ,Functional Laterality ,Speech Disorders ,Epilepsy ,Metabolic Diseases ,medicine ,Aphasia ,Humans ,Mri scan ,Tomography, Emission-Computed, Single-Photon ,Brain Diseases ,medicine.diagnostic_test ,business.industry ,Brain ,General Medicine ,Syndrome ,medicine.disease ,Surgery ,Frontal Lobe ,Cerebral blood flow ,Positron emission tomography ,Cerebrovascular Circulation ,Child, Preschool ,Pediatrics, Perinatology and Child Health ,Neurology (clinical) ,business ,Nuclear medicine - Abstract
We present a 5-year-old boy with Landau-Kleffner syndrome, whose clinical manifestations were very similar to cases previously reported in the literature. CT and MRI scan failed to document any morphological abnormalities of his brain. However, high resolution rCBF imaging by HMPAO and SPECT demonstrated relatively low-flow areas in the left middle frontal gyrus and the right mesiotemporal/hippocampal region corresponding to the localization of EEG changes.
- Published
- 1993
9. [Extravasation of cytostatics. Example of a severe complication from the use of long-term central venous catheters]
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F, Bach, C, Videbaek, J, Holst-Christensen, and S, Boesby
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Amsacrine ,Catheterization, Central Venous ,Leukemia, Myeloid, Acute ,Time Factors ,Humans ,Antineoplastic Agents ,Equipment Failure ,Female ,Radiography, Thoracic ,Middle Aged ,Extravasation of Diagnostic and Therapeutic Materials - Abstract
Completely implantable ports have become increasingly popular for venous access in the treatment of cancer. An uncommon but very serious complication is reported here: extravasation of a cytostatic agent secondary to a damaged Port-a-Cath catheter. Guidelines to be observed in implantation are recommended.
- Published
- 1991
10. Newborn screening for adrenoleukodystrophy: International experiences and challenges.
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Videbæk C, Melgaard L, Lund AM, and Grønborg SW
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- Infant, Newborn, Female, Humans, Neonatal Screening methods, New York, Genetic Association Studies, Adrenoleukodystrophy diagnosis, Adrenoleukodystrophy genetics, Adrenal Insufficiency diagnosis
- Abstract
X-linked adrenoleukodystrophy (XALD) is the most common leukodystrophy. It has an estimated incidence of around 1/17.000, and a variable phenotype. Following the passage of Aidens Law, New York became the first state to implement a newborn screening for XALD in 2013. Since then, 38 American states, Taiwan, and the Netherlands have included XALD in their NBS program, and Japan and Italy have ongoing pilot studies. Screening for XALD allows for early, potentially lifesaving treatment of adrenal insufficiency and cerebral demyelination but is also a complex subject, due to our limited understanding of the natural history and lack of prognostic biomarkers. Screening protocols and algorithms vary between countries and states, and results and experiences gained so far are important for the future implementation of XALD NBS in other countries. In this review, we have examined the algorithms, methodologies, and outcomes used, as well as how common challenges are addressed in countries/states that have experience using NBS for XALD. We identified 14 peer-reviewed reports on NBS for XALD. All studies presented methods for detecting XALD at birth by NBS using a combination of mass spectrometry and ABCD1 gene sequencing. This has allowed for early surveillance of presymptomatic XALD patients, and the possibility for early detection and timely treatment of XALD manifestations. Obstacles to NBS for XALD include how to deal with variants of unknown significance, whether to screen females, and the ethical concerns of an NBS for a disease where we have limited understanding of natural history and phenotype/genotype correlation., Competing Interests: Declaration of Competing Interest Sabine Grønborg has previously served on an advisory board for Bluebird Bio. None of the other authors have competing interest statements., (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2023
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11. Allogenic hematopoietic stem cell transplantation in two siblings with adult metachromatic leukodystrophy and a systematic literature review.
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Videbæk C, Stokholm J, Sengeløv H, Fjeldborg LU, Larsen VA, Krarup C, Nielsen JE, and Grønborg S
- Abstract
Two siblings were diagnosed with adult metachromatic leukodystrophy (MLD) and treated with hematopoietic stem cell transplantation (HSCT). While the older sibling was symptomatic at the time of diagnosis, her younger brother was diagnosed and transplanted at the presymptomatic state. We describe patients' clinical, biochemical, and genetic features, as well as neuropsychological and neurophysiological test results, and brain magnetic resonance imaging from pretransplantation and posttransplantation assessments. Both patients converted to complete donor chimerism and arylsulfatase A levels normalized 3 months posttransplantation. Twelve months posttransplantation, neurological and neuropsychological assessment for both patients showed stabilization, and they remained stable for the 38 months long observation period. To assess the effect of HSCT used as treatment for the rare, adult MLD subtype on survival and stabilization, we performed a systematic literature review and included 7 studies with a total of 26 cases. Of these 26 cases, 6 patients died of HSCT-related complications and 2 patients had graft rejection. Of the remaining 18 patients, 2 patients improved after HSCT, 13 patients stabilized, and 3 patients progressed, suggesting that HSCT potentially benefits adult MLD patients. Larger studies focusing on this subtype are needed and recommendations on criteria for HSCT in adult MLD need to be evolved., Competing Interests: The authors declare no potential conflict of interest., (© 2021 The Authors. JIMD Reports published by John Wiley & Sons Ltd on behalf of SSIEM.)
- Published
- 2021
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12. Drug-induced mild therapeutic hypothermia obtained by administration of a transient receptor potential vanilloid type 1 agonist.
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Fosgerau K, Weber UJ, Gotfredsen JW, Jayatissa M, Buus C, Kristensen NB, Vestergaard M, Teschendorf P, Schneider A, Hansen P, Raunsø J, Køber L, Torp-Pedersen C, and Videbaek C
- Subjects
- Animals, Capsaicin administration & dosage, Capsaicin pharmacology, Cattle, Disease Models, Animal, Dose-Response Relationship, Drug, Humans, Infusions, Intravenous, Macaca fascicularis, Out-of-Hospital Cardiac Arrest physiopathology, Rats, Rats, Sprague-Dawley, Resuscitation methods, TRPV Cation Channels agonists, Transient Receptor Potential Channels agonists, Capsaicin analogs & derivatives, Hypothermia, Induced, Out-of-Hospital Cardiac Arrest therapy
- Abstract
Background: The use of mechanical/physical devices for applying mild therapeutic hypothermia is the only proven neuroprotective treatment for survivors of out of hospital cardiac arrest. However, this type of therapy is cumbersome and associated with several side-effects. We investigated the feasibility of using a transient receptor potential vanilloid type 1 (TRPV1) agonist for obtaining drug-induced sustainable mild hypothermia., Methods: First, we screened a heterogeneous group of TRPV1 agonists and secondly we tested the hypothermic properties of a selected candidate by dose-response studies. Finally we tested the hypothermic properties in a large animal. The screening was in conscious rats, the dose-response experiments in conscious rats and in cynomologus monkeys, and the finally we tested the hypothermic properties in conscious young cattle (calves with a body weight as an adult human). The investigated TRPV1 agonists were administered by continuous intravenous infusion., Results: Screening: Dihydrocapsaicin (DHC), a component of chili pepper, displayed a desirable hypothermic profile with regards to the duration, depth and control in conscious rats. Dose-response experiments: In both rats and cynomologus monkeys DHC caused a dose-dependent and immediate decrease in body temperature. Thus in rats, infusion of DHC at doses of 0.125, 0.25, 0.50, and 0.75 mg/kg/h caused a maximal ΔT (°C) as compared to vehicle control of -0.9, -1.5, -2.0, and -4.2 within approximately 1 hour until the 6 hour infusion was stopped. Finally, in calves the intravenous infusion of DHC was able to maintain mild hypothermia with ΔT > -3°C for more than 12 hours., Conclusions: Our data support the hypothesis that infusion of dihydrocapsaicin is a candidate for testing as a primary or adjunct method of inducing and maintaining therapeutic hypothermia.
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- 2010
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13. Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin.
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Fosgerau K, Ristagno G, Jayatissa M, Axelsen M, Gotfredsen JW, Weber UJ, Køber L, Torp-Pedersen C, and Videbaek C
- Subjects
- Animals, Arrhythmias, Cardiac, Capsaicin administration & dosage, Capsaicin adverse effects, Capsaicin pharmacology, Cardiac Output, Low, Disease Models, Animal, Electric Countershock, Heart Arrest physiopathology, Humans, Infusions, Intravenous, Male, Rats, Rats, Sprague-Dawley, TRPV Cation Channels agonists, Transient Receptor Potential Channels agonists, Capsaicin analogs & derivatives, Heart Arrest drug therapy, Resuscitation
- Abstract
Background: Survivors of a cardiac arrest often have persistent cardiovascular derangements following cardiopulmonary resuscitation including decreased cardiac output, arrhythmias and morphological myocardial damage. These cardiovascular derangements may lead to an increased susceptibility towards the external and internal environment of the cardiovascular system as compared to the healthy situation., Methods: Here we tested the hypothesis that the cardiovascular system in healthy rats and rats resuscitated from a cardiac arrest may be differentially affected by a transient receptor potential vanilloid type 1 agonist, by continuous intravenous infusion of dihydrocapsaicin (DHC)., Results: Compared to baseline, infusion of DHC caused an initial increase in mean arterial blood pressure in both healthy and resuscitated rats of 25% and 10%, respectively. Also, we observed an initial response of tachycardia in both healthy and resuscitated rats of 30% and 20%, respectively. Then, at high levels of DHC infusion (> 2.0 mg/kg/hr) we observed two single episodes of transient bradycardia and hypotension in 33% of the healthy rats, which was consistent with a TRPV1 agonist induced Bezold-Jarisch reflex. In contrast, in resuscitated rats we observed multiple episodes of bradycardia/hypotension in 100% of the rats and at a dose of DHC of 0.65 mg/kg/hr. Notably, this DHC effect could be completely blocked in the resuscitated rats by pre-treatment with atropine, a muscarinic acetylcholine antagonist., Conclusions: Our results indicate that the susceptibility of the rats towards TRPV1 agonist induced Bezold-Jarisch reflex is increased in those resuscitated from cardiac arrest compared to the healthy situation.
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- 2010
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14. [123I]epidepride binding to cerebellar dopamine D2/D3 receptors is displaceable: implications for the use of cerebellum as a reference region.
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Pinborg LH, Videbaek C, Ziebell M, Mackeprang T, Friberg L, Rasmussen H, Knudsen GM, and Glenthoj BY
- Subjects
- Adult, Binding, Competitive, Cerebellum diagnostic imaging, Humans, Kinetics, Radiography, Radioligand Assay methods, Reference Values, Tomography, Emission-Computed, Single-Photon methods, Benzamides pharmacokinetics, Cerebellum metabolism, Iodine Radioisotopes, Pyrrolidines pharmacokinetics, Receptors, Dopamine D2 metabolism, Receptors, Dopamine D3 metabolism
- Abstract
The low density of cerebellar dopamine D(2)/D(3) receptors provides the basis for using the cerebellum as a representation of free- and non-specifically bound radioligand in positron emission tomography (PET) and single photon emission computed tomography (SPECT) studies. With the development of ultra high-affinity dopamine D(2)/D(3) ligands like [(123)I]epidepride, [(18)F]fallypride, and [(11)C]FLB-457, quantification of extrastriatal low density receptor populations including the cerebellum is possible with important implications for calculation of binding parameters. [(123)I]epidepride-SPECT was performed in 23 patients with schizophrenia before and after 3 months of antipsychotic treatment with either risperidone (n=14) or zuclopenthixol (n=9). In the unblocked situation and partially blocked situation, the average distribution volumes were 5.2+/-1.3 mL/mL and 4.0+/-0.8 mL/mL, respectively. The paired distribution volumes were reduced by 22+/-15% (mean+/-SD) after antipsychotic treatment (p<0.0001, paired Student's t-test). From the paired distribution volumes in cerebellum and extrastriatal regions, the average distribution volume representing free and non-specifically bound [(123)I]epidepride was calculated to be 3.3+/-0.8 mL/mL. Both the % [(123)I]epidepride fraction of plasma radioactivity (p>0.76) and the plasma [(123)I]epidepride concentration (p>0.45) were unchanged after antipsychotic treatment (paired Student's t-test). These results strongly suggest the presence of "non-negligible" specific [(123)I]epidepride binding to dopamine D(2)/D(3) receptors in the cerebellum. Using the cerebellum as a representation of free and non-specifically bound radioligand and neglecting the specifically bound component may lead to results that erroneously imply that antipsychotic drugs bind to extrastriatal dopamine D(2)/D(3) receptors with a higher affinity than to striatal dopamine D(2)/D(3) receptors.
- Published
- 2007
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15. Frontal dopamine D(2/3) receptor binding in drug-naive first-episode schizophrenic patients correlates with positive psychotic symptoms and gender.
- Author
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Glenthoj BY, Mackeprang T, Svarer C, Rasmussen H, Pinborg LH, Friberg L, Baaré W, Hemmingsen R, and Videbaek C
- Subjects
- Adult, Benzamides pharmacokinetics, Brain Mapping, Brief Psychiatric Rating Scale statistics & numerical data, Case-Control Studies, Contrast Media pharmacokinetics, Female, Frontal Lobe diagnostic imaging, Frontal Lobe drug effects, Humans, Iodine Isotopes pharmacokinetics, Male, Pyrrolidines pharmacokinetics, Schizophrenia diagnostic imaging, Tomography, Emission-Computed, Single-Photon methods, Frontal Lobe metabolism, Receptors, Dopamine D2 metabolism, Receptors, Dopamine D3 metabolism, Schizophrenia metabolism, Schizophrenic Psychology, Sex Characteristics
- Abstract
Background: The aim of the study was to examine extrastriatal dopamine D(2/3) receptor binding and psychopathology in schizophrenic patients, and to relate binding potential (BP) values to psychopathology., Methods: Twenty-five drug-naive schizophrenic patients and 20 healthy controls were examined with single-photon emission computerized tomography (SPECT) using the D(2/3)-receptor ligand [123I]epidepride., Results: In the hitherto largest study on extrastriatal D(2/3) receptors we detected a significant correlation between frontal D(2/3) BP values and positive schizophrenic symptoms in the larger group of male schizophrenic patients, higher frontal BP values in male (n = 17) compared to female (n = 8) patients, and - in accordance with this - significantly fewer positive schizophrenic symptoms in the female patients. No significant differences in BP values were observed between patients and controls; the patients, however, had significantly higher BP in the right compared to the left thalamus, whereas no significant hemispheric imbalances were observed in the healthy subjects., Conclusions: The present data are the first to confirm a significant correlation between frontal D(2/3) receptor BP values and positive symptoms in male schizophrenic patients. They are in agreement with the hypothesis that frontal D(2/3) receptor activity is significant for positive psychotic symptoms. Additionally, the data support a thalamic hemispheric imbalance in schizophrenia.
- Published
- 2006
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16. Imaging of dopamine transporters and D2 receptors in patients with Parkinson's disease and multiple system atrophy.
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Knudsen GM, Karlsborg M, Thomsen G, Krabbe K, Regeur L, Nygaard T, Videbaek C, and Werdelin L
- Subjects
- Adult, Aged, Benzamides pharmacokinetics, Brain diagnostic imaging, Brain metabolism, Cocaine pharmacokinetics, Diagnosis, Differential, Dopamine Plasma Membrane Transport Proteins, Female, Humans, Iodine Radioisotopes pharmacokinetics, Male, Middle Aged, Pyrrolidines pharmacokinetics, Radiopharmaceuticals pharmacokinetics, Reproducibility of Results, Sensitivity and Specificity, Cocaine analogs & derivatives, Membrane Glycoproteins metabolism, Membrane Transport Proteins metabolism, Multiple System Atrophy diagnostic imaging, Multiple System Atrophy metabolism, Nerve Tissue Proteins metabolism, Parkinson Disease diagnostic imaging, Parkinson Disease metabolism, Receptors, Dopamine D2 metabolism, Tomography, Emission-Computed, Single-Photon methods
- Abstract
Purpose: The aim of this study was to ascertain whether combined presynaptic and postsynaptic dopaminergic single-photon emission computed tomography (SPECT) scanning is useful for differentiation between patients with idiopathic Parkinson's disease (IPD), patients with multiple system atrophy of the striatonigral type (MSA) and healthy subjects., Methods: SPECT measurements of the dopamine transporter (DAT) were done with 123I-beta-CIT, while for determination of the dopamine D2-like receptors (D2), 123I-epidepride was used. Clinical evaluation and SPECT scans were carried out in 14 patients with IPD, eight patients with MSA and 11 healthy age-matched control subjects., Results: Putaminal DAT binding was reduced to 32% of control values in IPD and to 19% of control values in MSA . Significantly higher striatal asymmetry in DAT binding was found in MSA than in controls, but IPD patients had significantly higher asymmetry than MSA patients. Striatal D2 binding did not differ significantly between patients and healthy controls but the ratio between caudate DAT and D2 binding was significantly higher in patients with IPD than in those with MSA, even when disease severity was taken into account., Conclusion: Patients with reduced striatal 123I-beta-CIT binding and a side-to-side difference greater than 15% are likely to suffer from IPD. Patients with reduced striatal 123I-beta-CIT binding and a side-to-side difference of between 5% and 15% are more likely to have MSA. 123I-epidepride SPECT measurements may add further diagnostic information, since the ratio between DAT and D2 receptor binding is significantly higher in IPD than in MSA.
- Published
- 2004
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17. Quantification of [(123)I]PE2I binding to dopamine transporters with SPET.
- Author
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Pinborg LH, Videbaek C, Svarer C, Yndgaard S, Paulson OB, and Knudsen GM
- Subjects
- Area Under Curve, Cerebral Cortex blood supply, Cerebral Cortex diagnostic imaging, Cerebrovascular Circulation, Corpus Striatum blood supply, Corpus Striatum diagnostic imaging, Dopamine Plasma Membrane Transport Proteins, Humans, Middle Aged, Models, Chemical, Phantoms, Imaging, Radiopharmaceuticals pharmacokinetics, Sensitivity and Specificity, Tissue Distribution, Tomography, Emission-Computed, Single-Photon, Xenon Radioisotopes pharmacokinetics, Cerebral Cortex metabolism, Corpus Striatum metabolism, Membrane Glycoproteins, Membrane Transport Proteins metabolism, Models, Biological, Nerve Tissue Proteins, Nortropanes pharmacokinetics
- Abstract
The iodinated cocaine derivative [(123)I]PE2I is a new selective ligand for in vivo studies of the dopamine transporter (DAT) with single-photon emission tomography (SPET). The aim of the present study was to describe a method for accurate quantification of binding data following a bolus injection of [(123)I]PE2I. Six healthy subjects (age 51+/-24 years) underwent xenon-133 SPET for quantification of regional CBF and [(123)I]PE2I SPET for quantification of DAT binding. rCBFs were within normal limits in all subjects. Fitting data to a two-tissue compartment model resulted in striatal K(1) values of 0.39+/-0.08 ml ml(-1) min(-1), equal to a first-pass extraction fraction of 0.72+/-0.13. Distribution volumes (DVs) were calculated using compartment analysis, area under the curve analysis and Logan analysis. Logan analysis is preferred since stable DV values were already obtained 120 min after [(123)I]PE2I injection. Mean striatal DV was 37.9+/-9.6 ml ml(-1) and mean occipital cortex DV was 5.5+/-0.7 ml ml(-1). In the absence of local pathology in a reference tissue, Logan analysis without blood sampling is an attractive method for accurate quantification of striatal [(123)I]PE2I binding. The distribution volume ratio (DVR) (6.6+/-1.4) was in good agreement with the DVR calculated with blood (6.7+/-1.4).
- Published
- 2002
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18. Benzodiazepine receptor quantification in Huntington's disease with [(123)I]omazenil and SPECT.
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Pinborg LH, Videbaek C, Hasselbalch SG, Sørensen SA, Wagner A, Paulson OB, and Knudsen GM
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Tomography, Emission-Computed, Single-Photon, Flumazenil analogs & derivatives, Huntington Disease diagnostic imaging, Iodine Radioisotopes, Receptors, GABA-A analysis
- Abstract
Objectives: Increasing evidence suggests that metabolic changes predate neuronal death in Huntington's disease and emission tomography methods (PET and SPECT) have shown changes in glucose consumption and receptor function in early and possibly even presymptomatic disease. Because the GABA(A)-benzodiazepine receptor complex (BZR) is expressed on virtually all cerebral neurons BZR density images may be used to detect neuronal death. In this study the regional cerebral [(123)I]iomazenil binding to BZR was determined in patients with Huntington's disease and normal controls by a steady state method and SPECT., Methods: Seven patients mildly to moderately affected by Huntington's disease and seven age matched controls were studied. Brain CT was performed on all subjects. In each subject two [(123)I]iomazenil-SPECT measurements were acquired-one with and one without infusion of flumazenil. The affinity constant of flumazenil (Kd) was calculated from the paired distribution volumes (DV) and the free plasma flumazenil concentration. The distribution volume of [(123)I]iomazenil in the unblocked condition (DV(0)) reflects the ratio between BZR density and Kd., Results: Flumazenil Kd was similar in the Huntington's disease group and the control group (11.3 v 11.2 mM). For the Huntington's disease group a 31% reduction in striatal DV(0) (p=0.03) was found. In the cortical regions, DV(0) was similar in patients and in controls. In Huntington's disease, DV(0) correlated significantly with functional capacity (p=0.04) and chorea symptoms (p=0.02). The clinically least affected patients displayed DV(0)s within the range of those of the control group (19-35 ml/ml)., Conclusions: The finding of an unchanged Kd of flumazenil in patients indicates that the BZR is functionally intact in Huntington's disease. That is, the reduction in DV(0) for BZR represents a selective decrease in the number of striatal BZRs. DV(0) significantly correlated with functional loss and [(123)I]iomazenil-SPECT could be an important tool for validation of the effect of future therapeutic strategies aimed at limiting oxidative stress and free radicals in Huntington's disease.
- Published
- 2001
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19. In vivo measurement of haloperidol affinity to dopamine D2/D3 receptors by [123I]IBZM and single photon emission computed tomography.
- Author
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Videbaek C, Toska K, Friberg L, Holm S, Angelo HR, and Knudsen GM
- Subjects
- Adult, Animals, Brain cytology, Brain drug effects, Cerebrovascular Circulation drug effects, Female, Haloperidol administration & dosage, Haloperidol blood, Humans, Infusions, Intravenous, Kinetics, Male, Rats, Rats, Wistar, Receptors, Dopamine D2 analysis, Receptors, Dopamine D3, Autoradiography methods, Benzamides pharmacokinetics, Brain metabolism, Cerebrovascular Circulation physiology, Haloperidol pharmacology, Iodine Radioisotopes pharmacokinetics, Pyrrolidines pharmacokinetics, Receptors, Dopamine D2 metabolism, Tomography, Emission-Computed, Single-Photon methods
- Abstract
This study examines the feasibility of a steady-state bolus-integration method with the dopamine D2/D3 receptor single photon emission computer tomography (SPECT) tracer, [123I]IBZM, for determination of in vivo affinity of haloperidol. The nonspecific binding of [123I]IBZM was examined in the rat brain by infusion of haloperidol to plasma levels approximately 100 times the Kd level in man. In humans, Kd for haloperidol binding was measured in four healthy volunteers that were examined twice: once with partial dopamine D2/D3 receptor blockade obtained by a scheduled infusion of unlabeled haloperidol (0.7 mg total dosage), and once in an unblocked state. Blood sampling and SPECT were performed intermittently during 6 hours after intravenous [123I]IBZM bolus injection. Plasma [123I]IBZM was determined by octane extraction. Plasma haloperidol was determined by a radioimmunoassay, and plasma protein binding was determined by equilibrium dialysis. In humans, the striatal D2/D3 receptor occupancy was 0.27+/-0.085 and the in vivo Kd for haloperidol was 0.25+/-0.1 nmol/L, which is comparable to Kd values as obtained from in vitro studies. The authors conclude that steady-state [123I]IBZM SPECT studies allow for determination of dopamine D2/D3 receptor occupancy in striatum and in vivo measurement of drug affinity to striatal dopamine D2 and D3 receptors.
- Published
- 2001
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20. SPECT tracer [(123)I]IBZM has similar affinity to dopamine D2 and D3 receptors.
- Author
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Videbaek C, Toska K, Scheideler MA, Paulson OB, and Moos Knudsen G
- Subjects
- Animals, CHO Cells, Cricetinae, Humans, Receptors, Dopamine D3, Tomography, Emission-Computed, Single-Photon, Benzamides metabolism, Dopamine Antagonists metabolism, Pyrrolidines metabolism, Receptors, Dopamine D2 metabolism
- Abstract
Emission tomography investigations of the pathophysiological involvement of the cerebral dopaminergic transmitter system in the living human brain relies heavily on a careful selection of the most suitable radioligand. In recent years, many clinical studies have employed [(123)I]IBZM in SPECT studies. The aim of the present study was to characterize the binding of IBZM to dopaminergic receptor subtypes as a means of elucidating which receptor subtypes are visualized and examined by [(123)I]IBZM. The affinity of IBZM for each of the major human dopamine receptors (D1, D2(short), D3, D4(4. 2), and D5 receptor) was determined by competitive radioligand binding assay using membranes prepared from clonal cell lines expressing the different subtypes. Radioligands with high affinity for the D1(A) and D5 receptors ([(3)H]SCH-23390), dopamine D2(short) and D4(4.2) receptors ([(3)H]Spiroperidol), and dopamine D3 receptor ([(3)H]7-OH-DPAT) were used to measure specific binding. Corresponding unlabeled displacing ligands for determination of nonspecific binding were employed. Assays were performed at 25 degrees C. These experiments show that for IBZM K(i) values were 1.6 nM for dopamine D2(s) receptors and 2.2 nM for dopamine D3 receptors. There was no binding of IBZM to D1(A), D5, or D4(4.2) receptors. In conclusion, when [(123)I]IBZM is used as SPECT tracer, the studies reflect dopaminergic D2 as well as D3 receptor binding., (Copyright 2000 Wiley-Liss, Inc.)
- Published
- 2000
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21. Dopamine D(2) receptor quantification in extrastriatal brain regions using [(123)I]epidepride with bolus/infusion.
- Author
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Pinborg LH, Videbaek C, Knudsen GM, Swahn CG, Halldin C, Friberg L, Paulson OB, and Lassen NA
- Subjects
- Adult, Aged, Benzamides administration & dosage, Benzamides blood, Benzamides pharmacokinetics, Brain diagnostic imaging, Contrast Media administration & dosage, Contrast Media pharmacokinetics, Homeostasis, Humans, Iodine Radioisotopes, Male, Middle Aged, Pyrrolidines administration & dosage, Pyrrolidines blood, Pyrrolidines pharmacokinetics, Tissue Distribution, Tomography, Emission-Computed, Single-Photon, Brain metabolism, Receptors, Dopamine D2 metabolism
- Abstract
The iodinated benzamide epidepride, which shows a picomolar affinity binding to dopamine D(2) receptors, has been designed for in vivo studies using SPECT. The aim of the present study was to apply a steady-state condition by the bolus/infusion approach with [(123)I]epidepride for the quantification of striatal and extrastriatal dopamine D(2) receptors in humans. In this way the distribution volume of the tracer can be determined from a single SPECT image and one blood sample. Based on bolus experiments, an algorithm using conventional convolution arguments for prediction of the outcome of a bolus/infusion (B/I) experiment was applied. It was predicted that a B/I protocol with infusion of one-third of the initial bolus per hour would be appropriate. Steady-state conditions were attained in extrastriatal regions within 3-4 h but the infusion continued up to 7 h in order to minimize the significance of individual differences in plasma clearance and binding parameters. A steady-state condition, however, could not be attained in striatal brain regions using a B/I protocol of 20 h, even after 11 h. Under near steady-state conditions a striatal:cerebellar ratio of 23 was demonstrated. Epidepride has a unique signal-to-noise ratio compared to [(123)I]IBZM but present difficulties for steady-state measurements of striatal regions. The bolus/infusion approach is particularly feasible for quantification of the binding potential in extrastriatal regions., (Copyright 2000 Wiley-Liss, Inc.)
- Published
- 2000
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22. No effect of insulin on glucose blood-brain barrier transport and cerebral metabolism in humans.
- Author
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Hasselbalch SG, Knudsen GM, Videbaek C, Pinborg LH, Schmidt JF, Holm S, and Paulson OB
- Subjects
- Adult, Biological Transport, Active, Female, Fluorodeoxyglucose F18 pharmacokinetics, Humans, Male, Permeability, Radiopharmaceuticals pharmacokinetics, Reference Values, Tissue Distribution, Tomography, Emission-Computed, Blood Glucose metabolism, Blood-Brain Barrier physiology, Brain metabolism, Insulin blood
- Abstract
The effect of hyperinsulinemia on glucose blood-brain barrier (BBB) transport and cerebral metabolism (CMRglc) was studied using the intravenous double-indicator method and positron emission tomography using [18F]fluorodeoxyglucose as tracer (PET-FDG). Sixteen normal healthy control subjects (25 +/- 4 years old) were studied twice during a euglycemic and a euglycemic-hyperinsulinemic condition. Our hypothesis was that high physiologic levels of insulin did not affect the BBB transport or net metabolism of glucose. During insulin infusion, arterial plasma insulin levels increased from 48.5 to 499.4 pmol/l. The permeability-surface area products for glucose and FDG BBB transport obtained with the double-indicator method remained constant during hyperinsulinemia. Similarly using PET-FDG, no changes were observed in the unidirectional clearance of FDG from blood to brain. k2* (FDG transport from brain to blood) increased significantly by 15 and 18% (gray and white matter, respectively), and k4* (dephosphorylation of FDG) increased by 18%. The increase in k2* may be caused by insulin inducing a decrease in the available FDG brain pool. The increase in k4* may be related to an increased loss of labeled products during insulin fusion. Irrespective of these changes, CMRglc remained unchanged in all brain regions. We conclude that hyperinsulinemia within the normal physiologic range does not affect BBB glucose transport or net cerebral glucose metabolism.
- Published
- 1999
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- View/download PDF
23. Blood-brain barrier transport and protein binding of flumazenil and iomazenil in the rat: implications for neuroreceptor studies.
- Author
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Videbaek C, Ott P, Paulson OB, and Knudsen GM
- Subjects
- Animals, Biological Transport, Cerebrovascular Circulation drug effects, Ligands, Male, Rats, Rats, Wistar, Blood-Brain Barrier, Flumazenil analogs & derivatives, Flumazenil pharmacokinetics, GABA Modulators pharmacokinetics, GABA-A Receptor Antagonists
- Abstract
The calculated fraction of receptor ligands available for blood-brain barrier passage in vivo (f(avail)) may differ from in vitro (f(eq)) measurements. This study evaluates the protein-ligand interaction for iomazenil and flumazenil in rats by comparing f(eq) and f(avail). Repeated measurements of blood-brain barrier permeability for two benzodiazepine antagonists were performed in 44 rats by the double-indicator technique. Cerebral blood flow was measured by intracarotid Xe-injection. The apparent permeability-surface product (PSapp) was measured while CBF or bolus composition was changed. Comparison of PSapp obtained in the absence and presence of 5% albumin in the injectate yielded f(avail), whereas f(eq) was measured by equilibrium dialysis. Iomazenil and flumazenil f(avail) was 62% and 82%, respectively, whereas f(eq) was significantly lower, 42% and 61%. The PSapp for iomazenil and flumazenil increased significantly by 89% and 161% after relative CBF increases of 259% and 201%, respectively. The results demonstrate that application of f(eq) in neuroreceptor studies underestimates the plasma input function to the brain. Model simulations render possible that the differences between f(avail) and f(eq) as well as the effect of CBF on PSapp can be caused by capillary heterogeneity.
- Published
- 1999
- Full Text
- View/download PDF
24. Cerebral glucose metabolism is decreased in white matter changes in patients with phenylketonuria.
- Author
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Hasselbalch S, Knudsen GM, Toft PB, Høgh P, Tedeschi E, Holm S, Videbaek C, Henriksen O, Lou HC, and Paulson OB
- Subjects
- Adult, Brain pathology, Case-Control Studies, Female, Humans, Magnetic Resonance Imaging, Male, Phenylketonurias pathology, Brain metabolism, Glucose metabolism, Phenylketonurias metabolism
- Abstract
Cerebral magnetic resonance imaging (MRI) has revealed white matter changes in patients with phenylketonuria (PKU), an inborn error of metabolism with increased plasma phenylalanine level. Because the significance of these lesions is unknown, this study was undertaken to determine whether glucose metabolism was depressed in cerebral white matter MRI changes in patients with PKU. Four patients with PKU and nine healthy volunteers with an average age of 23 y (range 19-26 y) and 23 y (range 20-27 y), respectively, were studied. The IQ of patients with PKU was between 58 and 97. Cerebral MRI and positron emission tomography images with 18F-deoxyglucose were obtained, and arteriovenous differences for oxygen and glucose as well as cerebral blood flow was measured simultaneously to determine global cerebral oxygen and glucose metabolism. Cerebral MRI revealed that all patients with PKU had white matter changes with characteristic localization. In patients with PKU, regional glucose metabolism was 36% lower in the anterior periventricular areas, 0.14 +/- 0.06 compared with 0.22 +/- 0.04 mumol.g-1.min-1 in controls (mean +/- SD, p < 0.05, Mann-Whitney). Further, the ratio between glucose metabolism in the affected white matter and the cortex was 14% lower in the patients, decreasing from 0.57 +/- 0.05 to 0.48 +/- 0.06 (p < 0.05). Global cerebral blood flow, oxygen and glucose consumption were similar in the two groups. In conclusion, regional glucose metabolism is lower in MRI-demonstrated white matter changes. In mildly intellectually impaired patients with PKU, global cerebral glucose and oxygen metabolism remain intact.
- Published
- 1996
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- View/download PDF
25. Neuroreceptor quantification in vivo by the steady state principle and [123I]iomazenil in rats.
- Author
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Videbaek C, Andersen JV, Dalgaard L, Foged C, Paulson OB, and Lassen AN
- Subjects
- Animals, Blood metabolism, Brain metabolism, Flumazenil blood, Flumazenil pharmacology, Male, Mathematics, Rats, Rats, Wistar, Flumazenil analogs & derivatives, Neurons drug effects, Receptors, GABA-A drug effects
- Abstract
A steady state method for neuroreceptor quantification in vivo in small laboratory animals is described, using [123I]iomazenil as tracer for the benzodiazepine receptor. The method was used for determination of the receptor equilibrium constant for a non-radioactive ligand, flumazenil, in rats and involved measurement of the nonspecific binding of [123I]iomazenil. Thirty-five animals were intravenously infused for 2 h with [123I]iomazenil and flumazenil in different proportions to obtain occupancies of the benzodiazepine receptor from close to 0 to about 99%. The nonspecific binding of iomazenil in brain tissue was calculated by an iterative procedure from the data for the highly blocked animals, and it was found to be 1.04 ml per ml plasma (n = 6). The mean cortical Kd of flumazenil was 21 +/- 11 nM (n = 19). The method is discussed with special reference to the problems of ascertaining steady state and nonspecific binding.
- Published
- 1995
- Full Text
- View/download PDF
26. Tomographic cerebral blood flow measurement during carotid surgery.
- Author
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Knudsen L, Vorstrup S, Olsen KS, Videbaek C, and Schroeder TV
- Subjects
- Aged, Carotid Stenosis diagnostic imaging, Endarterectomy, Carotid, Female, Hemodynamics physiology, Humans, Male, Middle Aged, Organotechnetium Compounds, Oximes, Prospective Studies, Regional Blood Flow physiology, Technetium Tc 99m Exametazime, Brain blood supply, Brain Ischemia diagnostic imaging, Carotid Stenosis surgery, Intraoperative Complications diagnostic imaging, Tomography, Emission-Computed, Single-Photon
- Abstract
Objectives: The aim of the study was to depict regional cerebral blood flow (rCBF) during carotid cross clamping using 99mTechnetium-hexamethylpropylene amine oxime (TcHMPAO). This tracer rapidly passes the blood-brain barrier and is retained for hours in the brain tissue. Injecting TcHMPAO during surgery and performing single photon emission computer tomography (SPECT) scanning shortly after the operation thereby pictures rCBF at the time of injection., Design: Ongoing prospective study., Settings: Departments of Vascular Surgery, Neurology and Anaesthesiology, University Hospital, Rigshospitalet, Copenhagen, Denmark., Material: 15 patients who during a period of 4 months underwent carotid endarterectomy., Chief Outcome Measures: Prior to surgery rCBF was determined using 133Xe and SPECT. Intraoperatively stump pressure was measured and a bolus of TcHMPAO was injected for later SPECT measurement., Main Results: We found a significant correlation between stump pressure and enhancement of side-to-side asymmetry in rCBF due to carotid cross clamping. Pronounced variations were seen in which regions were deprived of perfusion during clamping., Conclusion: TcHMPAO allows tomographic assessment of CBF during carotid surgery. This method may serve as a reference tool in future research on intraoperative cerebral haemodynamics.
- Published
- 1994
- Full Text
- View/download PDF
27. Brain extraction and distribution of 99mTc-bicisate in humans and in rats.
- Author
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Knudsen GM, Andersen AR, Somnier FE, Videbaek C, Hasselbalch S, and Paulson OB
- Subjects
- Adult, Animals, Arteries, Biological Transport, Blood-Brain Barrier, Cerebrovascular Circulation, Female, Humans, Male, Middle Aged, Organotechnetium Compounds blood, Organotechnetium Compounds chemistry, Oximes pharmacokinetics, Rats, Rats, Wistar, Sodium Radioisotopes, Tissue Distribution, Veins, Brain metabolism, Cysteine analogs & derivatives, Organotechnetium Compounds pharmacokinetics
- Abstract
Blood-brain barrier (BBB) passage of the flow tracer ethylenediylbis-L-cystein diethylester (bicisate, ECD) was measured repeatedly in five patients by means of the intravenous (i.v.) double-indicator technique using 24Na+ as an intravascular cotracer. After i.v. injection, the arterial concentration curve of 99mTc-bicisate was delayed and dispersed compared with that of the intravascular cotracer, presumably due to lung retention of the flow tracer. The corrected cerebral venous output curves were fitted using a three-compartment model with four parameters. At resting cerebral blood flow (CBF) values, the unidirectional brain extraction was 0.57 +/- 0.05, the permeability-surface area product for passage from blood to brain (PS1) was 0.48 +/- 0.07 ml/g/min, and the distribution volume for bicisate was 0.74 +/- 0.20 (mean +/- SD). In a single patient, BBB transport after i.v. injection of bicisate was compared with that of a similar flow tracer, d,l-hexamethylpropyleneamine oxime (HM-PAO), and similar values were found for the two tracers. In 19 rats, the brain extraction of bicisate was measured by means of the intracarotid double-indicator technique. The brain extraction was measured at resting, decreased, and increased CBF values. Low CBF values were obtained by hyperventilation and high values by hypercapnia. The degree of backflux of tracer from brain to blood was evaluated by means of the three-compartment model and was found to be negligible in these experiments. The brain extraction was 0.70 +/- 0.1 and PS1 was 0.94 +/- 0.27 ml/g/min. During hypercapnia, CBF increased from 0.77 to 1.09 ml/g/min, leading to a significant decrease in brain extraction, from 0.70 to 0.56.(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1994
28. Benzodiazepine receptor equilibrium constants for flumazenil and midazolam determined in humans with the single photon emission computer tomography tracer [123I]iomazenil.
- Author
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Videbaek C, Friberg L, Holm S, Wammen S, Foged C, Andersen JV, Dalgaard L, and Lassen NA
- Subjects
- Adolescent, Adult, Binding Sites, Blood Proteins metabolism, Chromatography, High Pressure Liquid, Flumazenil analogs & derivatives, Flumazenil pharmacology, Humans, Male, Midazolam blood, Midazolam pharmacology, Protein Binding, Receptors, GABA-A drug effects, Flumazenil metabolism, Midazolam metabolism, Receptors, GABA-A metabolism
- Abstract
This study is based on the steady state method for the calculation of Kd values recently described by Lassen (J. Cereb. Blood Flow Metab. 12 (1992), 709), in which a constant infusion of the examined nonradioactive ligand is used with a bolus injection of tracer. Eight volunteers were examined twice, once without receptor blockade and once with a constant degree of partial blockade of the benzodiazepine receptors by infusion of nonradioactive flumazenil (Lanexat) or midazolam (Dormicum). Single photon emission computer tomography and blood sampling were performed intermittently for 6 h after bolus injection of [123I]iomazenil. The tracer in plasma was determined by high-pressure liquid chromatography and also by a simple octanol extraction procedure. The free concentration of flumazenil and midazolam in plasma water averaged 52% and 3.5% of that in whole plasma. The Kd values for the entire cortical rim for flumazenil were 7.4, 10.0, 10.3 and 17.7 nmol/l plasma water and, for midazolam, 73, 76, 58 and 30 nmol/l plasma water. The variation exceeds random methodological error and is probably due to interindividual differences in receptor affinity. The Kd level of midazolam is considerably higher than expected from the results of in vitro studies.
- Published
- 1993
- Full Text
- View/download PDF
29. The effect of tirilazad mesylate (U74006F) on cerebral oxygen consumption, and reactivity of cerebral blood flow to carbon dioxide in healthy volunteers.
- Author
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Olsen KS, Videbaek C, Agerlin N, Krøll M, Bøge-Rasmussen T, Paulson OB, and Gjerris F
- Subjects
- Adult, Brain blood supply, Brain metabolism, Double-Blind Method, Free Radical Scavengers, Humans, Lipid Peroxides antagonists & inhibitors, Male, Partial Pressure, Prospective Studies, Brain drug effects, Carbon Dioxide blood, Cerebrovascular Circulation drug effects, Oxygen Consumption drug effects, Pregnatrienes pharmacology
- Abstract
Background: The 21-aminosteroids are a series of compounds designed to inhibit lipid peroxidation in the cell, and, as such, may have cerebral protective effects. The current study was performed to evaluate the effect of a 21-aminosteroid, tirilazad mesylate (U74006F), on cerebral blood flow, metabolism, and carbon dioxide reactivity., Methods: Using a double-blind study design, eight volunteers received tirilazad mesylate, and eight others received only vehicle. The cerebral blood flow was measured by single photon emission computerized tomography using 133Xe inhalation in the resting condition at the beginning of the study and after infusion of tirilazad mesylate (1.5 mg/kg) or vehicle. Cerebral oxygen metabolism was calculated from the cerebral blood flow and the measured cerebral arteriovenous oxygen content difference. After both of the above cerebral blood flow measurements, arterial carbon dioxide tension was decreased by voluntary hyperventilation, and, later, increased by breathing an air/carbon dioxide mixture. The relative changes in cerebral blood flow induced by the PaCO2 variations were estimated from the changes in the arteriovenous oxygen content difference., Results: Blood pressure, pulse rate, and PaCO2 were similar before and after the infusion of tirilazad mesylate in both groups, and there was no difference between the groups. The cerebral blood flow and oxygen metabolism did not change after the tirilazad mesylate infusion. The slope of the regression line of relative change of estimated cerebral blood flow and PaCO2 (regression coefficients in both groups, > 0.90) was unchanged after infusion., Conclusions: Tirilazad mesylate has no effect on cerebral blood flow, cerebral oxygen metabolism, or reactivity of cerebral blood flow to carbon dioxide in healthy volunteers.
- Published
- 1993
- Full Text
- View/download PDF
30. Regional cerebral blood-flow measured by HMPAO and SPECT in a 5-year-old boy with Landau-Kleffner syndrome.
- Author
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Mouridsen SE, Videbaek C, Søgaard H, and Andersen AR
- Subjects
- Aphasia complications, Aphasia physiopathology, Brain blood supply, Brain pathology, Brain Diseases diagnostic imaging, Brain Diseases pathology, Cerebrovascular Circulation, Child, Preschool, Frontal Lobe metabolism, Frontal Lobe physiopathology, Functional Laterality, Hippocampus metabolism, Hippocampus physiopathology, Humans, Male, Metabolic Diseases metabolism, Metabolic Diseases physiopathology, Radiography, Speech Disorders complications, Tomography, Emission-Computed, Single-Photon, Brain physiopathology, Brain Diseases physiopathology, Syndrome
- Abstract
We present a 5-year-old boy with Landau-Kleffner syndrome, whose clinical manifestations were very similar to cases previously reported in the literature. CT and MRI scan failed to document any morphological abnormalities of his brain. However, high resolution rCBF imaging by HMPAO and SPECT demonstrated relatively low-flow areas in the left middle frontal gyrus and the right mesiotemporal/hippocampal region corresponding to the localization of EEG changes.
- Published
- 1993
- Full Text
- View/download PDF
31. Thalamic infarcts: Effects on cerebral blood flow, metabolism, and neuropsychological function.
- Author
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Boysen G, Høgh P, Pedersen H, Öberg G, Bruhn P, Thomsen AM, Videbæk C, Hasselbalch S, and Paulson O
- Abstract
In four patients with thalamic infarcts causing severe neuropsychological deficits, regional cerebral blood flow (rCBF) was measured by single-photon emission computed tomography using (99m)Tc-d,l,-hexamethylpropyleneamine oxime as tracer. In one of these patients, cerebral glucose metabolism was measured by positron emission tomography using (18)F-fluorodeoxyglucose as tracer. Three patients had left paramedian thalamic infarcts, in one case combined with an infarction of the right cerebellar hemisphere, and one had bilateral paramedian and left anterior thalamic infarcts. Neuropsychological assessment revealed profound impairment of memory, verbal fluency, and abstract reasoning, as well as perseveration and varying degrees of dyscalculia and constructional apraxia in all patients. There were distinct personality changes and deficient judgment and insight. All four patients had reduced cortical rCBF in the left frontoparietal regions. In three cases, flow was also reduced in the left temporal lobe; they all presented with a fluent aphasia, which only partly remitted over time. Prosody and mimics were impaired only in the patient with bilateral thalamic infarction. In one of the patients with unilateral thalamic infarct extending into the mesencephalon, glucose metabolism was reduced in the ipsilateral frontal, temporal, and occipital regions. Thalamic infarcts can alter the activity in widespread functional systems of the brain and thus lead to extensive neuropsychological deficits., (Copyright © 1993. Published by Elsevier Inc.)
- Published
- 1993
- Full Text
- View/download PDF
32. The effect of ketanserin on cerebral blood flow and cerebrovascular CO2 reactivity in healthy volunteers.
- Author
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Olsen KS, Videbaek C, Schmidt JF, and Paulson OB
- Subjects
- Adult, Blood Pressure drug effects, Female, Homeostasis drug effects, Humans, Infusions, Intravenous, Male, Oxygen Consumption drug effects, Tomography, Emission-Computed, Single-Photon, Brain blood supply, Carbon Dioxide blood, Ketanserin pharmacology
- Abstract
The effect of the anti-hypertensive agent ketanserin on the cerebral blood flow (CBF) and the cerebrovascular CO2 reactivity was examined in 10 healthy volunteers. Ketanserin was administered as an intravenous bolus of 10 mg followed by an infusion of 6 mg/h. Before administration CBF was measured by single photon emission computerized tomography (SPECT) of inhaled 133Xenon. Then arterial CO2 tension was subsequently decreased by voluntary hyperventilation and increased by breathing an air/CO2 mixture. The relative changes in CBF induced by the changes in arterial CO2 tension were estimated by the cerebral arterio-venous oxygen content difference method. One hour following the start of ketanserin infusion the SPECT measurement and CO2 manipulations were repeated. The CO2 reactivity (expressed as the slope of the regression line of the linear relation between CBF and PaCO2), was unchanged, i.e. 3.2%/0.1 kPa before ketanserin and 4.1%/0.1 kPa during ketanserin, respectively. Using regression lines from a semi-logarithmic plot the CO2 reactivity was also unchanged 3.4%/0.1 kPa and 3.5%/0.1 kPa, respectively. Ketanserin did not change CBF. The cerebral oxygen metabolism (CMRO2) was decreased 19% one hour after the start of infusion of ketanserin. In conclusion administration of ketanserin in a clinically relevant dose to healthy volunteers does not change the regional CBF not the cerebrovascular CO2 reactivity, but a decrease in CMRO2 was observed. However further studies are needed to clarify whether ketanserin in fact has a depressing effect on CMRO2 or whether the different results are caused by methodological errors or stochastic variation.
- Published
- 1992
- Full Text
- View/download PDF
33. [Extravasation of cytostatics. Example of a severe complication from the use of long-term central venous catheters].
- Author
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Bach F, Videbaek C, Holst-Christensen J, and Boesby S
- Subjects
- Amsacrine administration & dosage, Amsacrine adverse effects, Antineoplastic Agents administration & dosage, Catheterization, Central Venous instrumentation, Equipment Failure, Female, Humans, Middle Aged, Radiography, Thoracic, Time Factors, Antineoplastic Agents adverse effects, Catheterization, Central Venous adverse effects, Extravasation of Diagnostic and Therapeutic Materials etiology, Leukemia, Myeloid, Acute drug therapy
- Abstract
Completely implantable ports have become increasingly popular for venous access in the treatment of cancer. An uncommon but very serious complication is reported here: extravasation of a cytostatic agent secondary to a damaged Port-a-Cath catheter. Guidelines to be observed in implantation are recommended.
- Published
- 1991
34. Cytostatic extravasation. A serious complication of long-term venous access.
- Author
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Bach F, Videbaek C, Holst-Christensen J, and Boesby S
- Subjects
- Antineoplastic Agents adverse effects, Equipment Failure, Female, Heart Atria, Humans, Leukemia, Myeloid diagnostic imaging, Middle Aged, Necrosis chemically induced, Radiography, Catheters, Indwelling, Extravasation of Diagnostic and Therapeutic Materials, Infusion Pumps, Implantable, Leukemia, Myeloid drug therapy
- Abstract
Totally implantable ports have gained popularity as venous access in the treatment of cancer. A case is reported with an uncommon but very serious complication, i.e., cytostatic extravasation secondary to a broken implanted catheter. Guidelines for implantation and remedies are recommended.
- Published
- 1991
- Full Text
- View/download PDF
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