Search

Your search keyword '"W J Rappel"' showing total 7 results
Start Over Author "W J Rappel"
7 results on '"W J Rappel"'

1. Spatiotemporal signatures of response to atrial fibrillation ablation

Author

P Ganesan, A J Rogers, B Deb, R Feng, M Rodrigo, S Ruiperez-Campillo, F V Tjong, N Bhatia, P Clopton, W J Rappel, and S M Narayan

Subjects
Cardiology and Cardiovascular Medicine
Abstract

Background Atrial fibrillation (AF) can have organized regions, in the form of consistent dominant frequency sites, focal or reentrant sites, but it is unclear how these overlap with or differ from focal atrial tachycardias (AT) or potential drivers. We set out to develop an intuitive method based on fundamental electrogram shape and timing to separate types of AF. Objective To test the hypothesis that spatial regions of electrogram (EGM) in AF that show similar shapes over time based on cross-correlation analysis may separate patients with differing response to ablation. Methods We recruited N=133 patients (63.8±12.1 Y, 32% women), (i) N=10 had AT, (ii) N=122 AF that was or was not terminated by ablation, and (iii) N=1 pacing. All patients had left atrial mapping by 64 pole baskets. We applied repetitive activity (REACT) mapping that correlates EGMs in contiguous 2x2 regions (Fig. 1A) over 4sec. To calibrate REACT, we introduced simulated variations in shape (gaussian noise) and timing (gaussian delay) to pacing EGMs and computed nomograph over 100 random trials (Fig. 1C). Results Fig. 1B shows that REACT in a 71-year-old man with AT is more organized than in a 65 YO man with AF (100% vs 40% mapped field). Overall, REACT was higher in AT than AF (0.63±0.15 vs 0.36±0.22, p Conclusion Basic electrogram properties in AF of similar shapes in spatial areas over time can separate response to ablation and may represent “islands” of AT. Future studies should investigate the mechanisms for such islands and whether they may be targeted for therapy. Funding Acknowledgement Type of funding sources: Public grant(s) – National budget only. Main funding source(s): US National Institutes of Health

Published
2022
Full Text
View/download PDF

2. Novel electrogram featurization reveals a spectrum of response to ablation from atrial tachycardia to types of atrial fibrillation

Author

P Ganesan, A J Rogers, B Deb, R Feng, S Ruiperez-Campillo, F V Tjong, N Bhatia, P Clopton, W J Rappel, and S M Narayan

Subjects
Cardiology and Cardiovascular Medicine
Abstract

Background Although atrial tachycardia (AT) may interconvert with fibrillation (AF) in many patients, it is undefined if this represents a pathophysiological spectrum of organization, or whether it indicates that AF will respond better to ablation. Objective To test the hypothesis that the spatial area within which electrograms (EGMs) repeat in synchronized fashion over time indicates a spectrum from AT, in which areas span the entire atria, to AF, in which areas are limited. We further hypothesized that repetitive areas would be larger in AF patients with acute termination than in those with poor response to ablation. Methods We studied N=234 patients (47% women, 64±10Y), of whom (i) N=10 had AT, (ii) N=120 had AF that terminated with ablation (“Term”), (ii) N=104 had AF that did not terminate (“Non-term”). All patients had global left atrial mapping by 64 pole baskets (Abbott, IL). Spatial areas of repetitive activity (REACT) were calculated by correlating unipolar EGMs in 2x2 grids for 4 sec, repeated for the entire atria (Figure 1A, B). We quantified global organization by averaging the REACT map for each patient. Results Figure 1C shows progressively decreasing areas of repetitive EGM from AT to AF Term to AF Non-term (p0.90, a case of AF REACT 0.45 in a 65 YO male with termination by ablation, and a case of AF with REACT 0.19 in an 85 YO male that did not terminate. Further, ROC analysis of REACT analysis in AF cases predicted termination with an AUC of 0.71. Conclusion Spatial areas of repeating electrogram shapes indicates a spectrum from AT to AF with good and AF with poor acute response to ablation. Future studies should investigate whether REACT areas can be identified non-invasively, such as by body surface ECG, to guide ablation or prognosis. Funding Acknowledgement Type of funding sources: Public grant(s) – National budget only. Main funding source(s): US National Institutes of Health

Published
2022
Full Text
View/download PDF

4. Model of banding in diffusive and convective regimes during directional solidification of peritectic systems

Author

Alain Karma, B. C. Fuh, W. J. Rappel, and R. Trivedi

Subjects
Convection, Phase transition, Materials science, Diffusion equation, Metallurgy, Metals and Alloys, Nucleation, Thermodynamics, Mechanics, Condensed Matter Physics, Boundary layer, Mechanics of Materials, Phase (matter), Diffusion (business), Directional solidification
Abstract

The formation of banded microstructure in peritectic systems is examined theoretically in both diffusive and convective regimes. A rigorous model is developed in the diffusive regime that describes the non-steady-state growth of alternate solid α and β phase bands with a planar solid-liquid interface. The model is extended to incorporate the effect of convection by assuming that solute diffusion takes place within a boundary layer of constant thickness, with a uniform composition in the mixed liquid zone outside this layer. The model predicts that convection effects in a semi-infinite sample narrow the composition range over which extended banding can occur, and the spacing of bands is reduced compared to the diffusive growth model. In a finite length sample, convection is shown to lead only to the transient formation of bands. In this transient banding regime, only a few bands with a variable width are formed, and this transient banding process can occur over a wide range of compositions inside the two-phase peritectic region. Directional solidification studies in the Pb-Bi system show transient bands and agree qualitatively with these predictions. However, the basic mechanisms of band formation observed in this system is found to be significantly different from the one assumed in the model. A new mechanisms of banding is proposed in which continuous growth of both phases is present instead of nucleation at the boundary of the pre-existing phase. This mechanism yields an oscillatory structure with a shorter spatial periodicity than the band spacing predicted by the purely diffusive or boundary layer convective models.

Published
1998
Full Text
View/download PDF

5. Poster Session 2

Author

T. Andersson, A. Magnusson, I.- L. Bryngelsson, O. Frobert, K. M. Henriksson, N. Edvardsson, D. Poci, M. Polovina, T. Potpara, M. Licina, N. Mujovic, A. Kocijancic, D. Simic, M. C. Ostojic, R. A. Providencia, A. Botelho, J. Trigo, J. Nascimento, N. Quintal, P. Mota, A. M. Leitao-Marques, R. F. Bosch, W. Kirch, L. Rosin, S. N. Willich, D. Pittrow, H. Bonnemeier, M. C. Valenza, L. Martin, T. Munoz Casaubon, G. Valenza, M. Botella, M. Serrano, B. Valenza, I. Cabrera, K. Anderson, B. S. Benzaquen, N. Koziolova, J. Nikonova, Y. Shilova, D. Scherr, S. Narayan, M. Wright, D. Krummen, A. Jadidi, P. Jais, M. Haissaguerre, M. Hocini, R. Hunter, Y. Liu, Y. Lu, W. Wang, R. J. Schilling, S. Bernstein, B. Wong, R. Rooke, C. Vasquez, R. Shah, S. Rosenberg, L. Chinitz, G. Morley, M. Bashir Choudhary, F. Holmqvist, J. Carlson, H.- J. Nilsson, P. G. Platonov, A. S. Jadidi, H. Cochet, S. Miyazaki, A. J. Shah, N. Marrouche, N. Calvo, M. Nadal, D. Andreu, D. Tamborero, F. E. Diaz, A. Berruezo, J. Brugada, L. Mont, S. Fichtner, G. Hessling, H. L. Estner, C. Jilek, T. Reents, S. Ammar, J. Wu, I. Deisenhofer, H. Nakanishi, K. Kashiwase, A. Hirata, M. Wada, Y. Ueda, J. Skoda, P. Neuzil, J. Popelova, J. Petru, L. Sediva, V. Y. Reddy, L. Uldry, A. Forclaz, N. Virag, J.- M. Vesin, L. Kappenberger, R. Sehra, C. Briggs, W.- J. Rappel, M. Janotka, M. Chovanec, K. Yamashiro, K. Takami, Y. Sakamoto, K. Satoh, T. Suzuki, H. Nakagawa, A. Romanov, E. Pokushalov, S. Artemenko, V. Shabanov, I. Stenin, D. Elesin, A. Turov, A. Yakubov, M. Hioki, S. Matsuo, K. Ito, R. Narui, S. Yamashita, K. Sugimoto, M. Yoshimura, T. Yamane, L. Di Biase, J. D. Gallinghouse, K. Rajappan, J. Kautzner, A. Dello Russo, C. Tondo, F. Lorgat, A. Natale, O. Balta, K. Buenz, M. Paessler, H. Anders, M. Horlitz, T. Deneke, L. Lickfett, I. Liberman, M. Linhart, R. Andrie, E. Mittmann-Braun, F. Stockigt, G. Nickenig, J. Schrickel, R. Tilz, A. Rillig, B. Feige, A. Metzner, A. Fuernkranz, A. Burchard, E. Wissner, F. Ouyang, T. R. Betts, M. A. Jones, K. C. K. Wong, N. Qureshi, Y. Bashir, G. Corbucci, D. Losik, V. Selina, M. A. Crandall, C. Daniels, E. Daoud, S. Kalbfleisch, H. Yamaji, T. Murakami, H. Kawamura, M. Murakami, K. Hina, S. Kusachi, G. Dakos, V. Vassilikos, S. Paraskevaidis, A. Mantziari, S. Theophylogiannakos, I. Chouvarda, I. Chatzizisis, I. Styliadis, T. Kimura, K. Fukumoto, N. Nishiyama, Y. Aizawa, Y. Fukuda, T. Sato, S. Miyoshi, S. Takatsuki, A. J. Navarrete Casas, I. Ali, F. C. Conte, M. Moran, B. G. Graham, O. Kalejs, R. Lacis, P. Stradins, A. Koris, I. Putnins, M. Vikmane, A. Lejnieks, A. Erglis, A. Estrada, A. Perez Silva, S. Castrejon, D. Doiny, J. L. Merino, A. Baranchuk, I. Greiss, C. S. Simpson, H. Abdollah, D. P. Redfearn, M. Buys-Topart, R. Nitzsche, B. Thibault, S. Kathan, C. Kolb, S. Reif, S. Schade, J. Taggeselle, A. Frey, A. Birkenhagen, S. Kohler, M. Schmidt, O. Cano Perez, F. Buendia, B. Igual, J. M. Osca, J. M. Sanchez, M. J. Sancho-Tello, J. M. Olague, A. Salvador, J. M. Tolosana, J. Fernandez-Armenta, M. Matas, M. C. Barbarin, M. Habibovic, K. C. Van Den Broek, D. A. M. J. Theuns, L. Jordaens, M. Alings, P. H. Van Der Voort, S. S. Pedersen, G. Pupita, S. Molini, M. Brambatti, A. Capucci, S. Molodykh, E. M. Idov, O. V. Belyaev, L. Segreti, E. Soldati, G. Zucchelli, A. Di Cori, S. Viani, L. Paperini, R. De Lucia, M. G. Bongiorni, L. Binner, M. Taborsky, D. Bello, H. Heuer, B. Ramza, I. Jenniskens, W. B. Johnson, M. S. Silvetti, L. Rava', M. S. Russo, C. Di Mambro, A. Ammirati, G. Gimigliano, M. Prosperi, F. Drago, A. R. Santos, B. Picarra, P. Semedo, P. Dionisio, R. Matos, M. Leitao, A. Jacinto, M. Trinca, P. Mazzone, G. Ciconte, A. Marzi, G. Paglino, P. Vergara, N. Sora, S. Gulletta, P. Della Bella, P. Koppitz, A. Fach, S. Hobbiesiefken, E. Fiehn, R. Hambrecht, J. Sperzel, M. Jung, J. Schmitt, D. Pajitnev, H. Burger, G. Goebel, W. Ehrlich, T. Walther, T. Ziegelhoeffer, V. Vancura, D. Wichterle, V. Melenovsky, M. Glikson, G. Goldenberg, A. Segev, D. Dvir, J. Kuzniec, A. Finkelstein, I. Hay, V. Guetta, W. K. Choo, S. Gupta, R. Kirkfeldt, J. Johansen, E. Nohr, M. Moller, P. Arnsbo, J. Nielsen, M. Banha, P. Stojanov, S. Raspopovic, D. Vasic, D. Savic, G. Nikcevic, V. Jovanovic, P. Defaye, B. Mondesert, A. Mbaye, R. Cassagneau, V. Gagniere, J. Jacon, V. Sanfins, H. R. Reis, J. N. Nobre, V. M. Martins, L. D. Duarte, C. M. Morais, J. C. Conceicao, M. Hero, J. L. Rey, A. Ducharme, C. Simpson, C. Stuglin, L. Blier, M. Senaratne, Y. Khaykin, A. Pinter, A. Mlynarska, R. Mlynarski, M. Sosnowski, J. Wilczek, C. Iorgulescu, S. Bogdan, D. Constantinescu, C. Caldararu, M. Dorobantu, A. Radu, R.- G. Vatasescu, S. Yusu, T. Ikeda, H. Mera, Y. Miwa, A. Abe, M. Miyakoshi, T. Tsukada, H. Yoshino, V. Nayar, P. Cantelon, A. Rawling, M. R. D. Belham, P. J. Pugh, J. Osca Asensi, O. Cano, D. Tejada, B. Munoz, M. Rodriguez, J. Olague, L. Wecke, A. Van Hunnik, T. Thompson, L. Di Carlo, M. Zdeblick, A. Auricchio, F. Prinzen, A. Doltra Magarolas, B. Bijnens, E. Silva, D. Penela, M. Sitges, P. Ofman, L. Navaravong, J. Leng, A. Peralta, P. Hoffmeister, R. Levine, J. Cook, M. Stoenescu, M. E. Tettamanti, A. Revilla Orodea, J. Lopez Diaz, L. De La Fuente Galan, R. Arnold, E. Garcia Moran, J. A. San Roman Calvar, I. Gomez Salvador, K. Nakamura, M. Takami, T. Keida, A. Mesato, S. Higa, M. Shimabukuro, H. Masuzaki, R. Proietti, A. Sagone, G. Domenichini, H. Burri, C. Valzania, M. Biffi, H. Sunthorn, G. Gavaruzzi, H. Foulkes, G. Boriani, S. Koh, W. Hou, J. Snell, J. Poore, N. Dalal, G. Bornzin, A. Kloppe, D. Mijic, H. Bogossian, I. Ninios, M. Zarse, B. Lemke, L. Guedon-Moreau, C. Kouakam, D. Klug, C. Marquie, F. Ziglio, S. Kacet, H. Mohamed Fereig Hamed, A. M. A. L. Hamdy, A. H. M. E. D. Abd El Aziz, M. R. V. A. T. Nabih, R. E. H. A. B. Hamdy, A. Yaminisaharif, G. H. Davoudi, A. Kasemisaeid, S. Sadeghian, A. Vasheghani Farahani, P. Yazdanifard, A. Shafiee, C. Alonso, C. Grimard, G. Jauvert, A. Lazarus, L. L. Mont, J. Ortiz-Perez, T. Caralt, J. Escudero, F. Perez, K. M. Griffith, R. Ferreyra, P. Urena, M. Demas, C. Muratore, H. Mazzetti, J. Guardado, M. Fernandes, V. H. Pereira, F. Canario-Almeida, F. Ferreira, B. Rodrigues, J. Almeida, A. Sokal, E. Jedrzejczyk, R. Lenarczyk, S. Pluta, O. Kowalski, P. Pruszkowska, A. Swiatkowski, Z. Kalarus, M. Heinke, B. Ismer, H. Kuehnert, T. Heinke, R. Surber, N. Osypka, D. Prochnau, H. R. Figulla, S. Iacopino, M. Landolina, A. Proclemer, L. Padeletti, V. Calvi, A. Pierantozzi, P. Di Stefano, A. Bauer, F. Bode, F. Le Gal, J. C. Deharo, M. Delay, J. Clementy, M. Kawamura, Y. Munetsugu, K. Tanno, Y. Kobayashi, D. Cannom, J. Hosoda, T. Ishikawa, K. Andoh, M. Nobuyoshi, S. Fujii, S. Shizuta, T. Isshiki, M. A. Castel, F. Perez-Villa, B. Vidal, P. Pruszkowska-Skrzep, M. Szulik, T. Kukulski, L. Gianfranchi, K. Bettiol, F. Pacchioni, P. Alboni, R. Abu Sham'a, J. Buber, E. Nof, R. Kuperstein, M. Feinberg, D. Luria, M. Eldar, K. Parks, J. R. Stone, J. P. Singh, E. Hatzinikolaou-Kotsakou, M. Kotsakou, T. H. Beleveslis, G. Moschos, E. Reppas, P. Latsios, K. Tsakiridis, A. Kazemisaeid, G. Davoodi, A. Yamini Sharif, M. Sheikhvatan, M. Toniolo, G. Zanotto, A. Rossi, L. Tomasi, C. Vassanelli, H. Versteeg, P. M. C. Mommersteeg, G. Vergara, J. Blauer, R. Ranjan, S. Vijayakumar, E. Kholmovski, N. Volland, R. Macleod, L. E. Aguinaga Arrascue, A. Bravo, P. Garcia Freire, P. Gallardo, E. Hasbani, J. Dantur, R. Quintana, P. P. Adragao, D. Cavaco, L. Parreira, K. Reis Santos, P. Carmo, R. Miranda, S. Marcelino, D. Cabrita, P. Sommer, T. Gaspar, S. Rolf, A. Arya, C. Piorkowski, G. Hindricks, E. Valles Gras, V. Bazan, L. Portillo, F. Suarez, J. Bruguera, J. Marti, Y. Huo, S. Richter, R. Schoenbauer, N. Rivas, J. Casaldaliga, I. Roca, L. Dos, J. Perez-Rodon, A. Pijuan, D. Garcia-Dorado, A. Moya, H. B. Carter, A. Garg, J. Hegrenes, H. J. Sih, L. R. Teplitsky, K. Kuroki, H. Tada, Y. Seo, T. Ishizu, M. Igawa, Y. Sekiguchi, K. Kuga, K. Aonuma, C. Rodriguez A, J. Mejias, P. Hidalgo, J. A. Hidalgo L, M. Orczykowski, P. Derejko, F. Walczak, E. Szufladowicz, P. Urbanek, R. Bodalski, K. Bieganowska, L. Szumowski, P. Peichl, R. Cihak, I. Skalsky, P. Kubus, P. Vit, L. Zaoral, R. A. Gebauer, M. Fiala, J. Janousek, K. Hiroshima, M. Goya, M. Ohe, K. Hayashi, Y. Makihara, M. Nagashima, Y. An, M. Schloesser, T. Lawrenz, D. Meyer Zu Vilsendorf, C. Strunk-Mueller, C. Stellbrink, J. Papagiannis, D. Avramidis, C. Kokkinakis, G. Kirvassilis, G. Eidelman, A. Arenal, T. Datino, F. Atienza, E. Gonzalez Torrecilla, A. Miracle, J. Hernandez, F. Fernandez Aviles, E. Ene, P. Insulander, H. Bastani, F. Braunschweig, N. Drca, G. Kenneback, J. Schwieler, J. Tapanainen, M. Jensen-Urstad, B. Andrea, E. M. A. Andrea, W. M. Maciel, L. S. Siqueira, R. C. Cosenza, F. M. Mittidieri, S. F. Farah, J. A. Atie, E. Kanoupakis, E. Kallergis, H. Mavrakis, C. Goudis, I. Saloustros, N. Malliaraki, G. Chlouverakis, P. Vardas, J. L. Bonnes, J. Jaspers Focks, S. W. Westra, M. A. Brouwer, J. L. R. M. Smeets, G. Inama, C. Pedrinazzi, F. Oliva, M. Senni, M. Zoni Berisso, S. Mostov, M. Haim, R. Nevzorov, D. Hasadi, B. Starsberg, A. Porter, J. Kuschyk, A. Schoene, F. Streitner, C. G. Veltmann, R. Schimpf, M. Borggrefe, U. Luesebrink, A. Gardiwal, H. Oswald, T. Koenig, D. Duncker, G. Klein, R. Bastiaenen, V. Batchvarov, O. Atty, J. H. Cheng, E. R. Behr, M. M. Gallagher, A. H. Starrenburg, K. Kraaier, M. F. Scholten, J. Van Der Palen, S. Adhya, L. A. Smith, T. Zhao, C. Bannister, R. H. Kamdar, M. Martinelli, S. Siqueira, R. Greco, S. A. D. Nishioka, A. A. A. Pedrosa, R. Alkmim-Teixeira, G. L. Peixoto, R. Costa, J. C. Nielsen, P. T. Mortensen, J. B. Johansen, W. Kwasniewski, A. Filipecki, D. Urbanczyk-Swic, W. Orszulak, M. Trusz - Gluza, J. Jimenez-Candil, J. Morinigo, C. Ledesma, C. Martin-Luengo, T. Vogtmann, M. Gomer, S. Stiller, V. Kuehlkamp, G. Zach, S. Loescher, S. Kespohl, G. Baumann, J. D. Snell, N. Korsun, J. R. Snell, B. Morley, R. Bharmi, Y. Nabutovsky, M. Mollerus, L. Naslund, A. Meyer, M. Lipinski, B. Libey, K. Dornfeld, A. Martin, M. Gallego, M. K. De Bie, J. B. Van Rees, C. J. Borleffs, J. Thijssen, J. W. Jukema, M. J. Schalij, L. Van Erven, E. T. Van Der Velde, T. A. Witteman, H. Foeken, T. Szili-Torok, F. Akca, K. Caliskan, F. Ten Cate, M. Michels, D. C. Cozma, L. Petrescu, C. Mornos, S. I. Dragulescu, J. A. Groeneweg, B. K. Velthuis, M. G. P. J. Cox, P. Loh, D. Dooijes, M. J. Cramer, J. M. T. De Bakker, R. N. W. Hauer, S. D. Park, S. H. Shin, S. I. Woo, J. Kwan, K. S. Park, D. H. Kim, A. Iorio, L. Vitali Serdoz, F. Brun, E. Daleffe, M. Zecchin, M. Dal Ferro, S. Santangelo, G. F. Sinagra, S. Ouali, R. Hammemi, S. Hammas, S. Kacem, R. Gribaa, E. Neffeti, F. Remedi, E. Boughzela, P. Korantzopoulos, K. Letsas, Z. Christogiannis, K. Kalantzi, A. Ntorkos, J. Goudevenos, P. W. X. Foley, L. Yung, E. Barnes, M. Kikuchi, H. Ito, F. Miyoshi, R. Pecini, J. M. Marott, G. B. Jensen, J. Theilade, T. Mine, T. Kodani, T. Masuyama, I. M. Mozos, C. Serban, C. Costea, L. Susan, P. Barthel, A. Mueller, M. Malik, G. Schmidt, O. Karakurt, H. Kilic, D. R. Munevver Sari, D. Mroczek-Czernecka, A. Z. Pietrucha, A. Borowiec, M. Wnuk, I. Bzukala, O. Kruszelnicka, E. Konduracka, J. Nessler, Y. Kikuchi, A. Meireles, C. Gomes, D. Anjo, C. Roque, A. Pinheiro Vieira, V. Lagarto, A. Hipolito Reis, S. Torres, L. Miller, G. Vedrenne, E. Bruguiere, A. Redheuil, T. Lavergne, J. Y. Le Heuzey, E. Mousseaux, A. Hersi, K. Alhabib, H. Alfaleh, K. Sulaiman, W. Almahmeed, J. Alsuwidi, H. Amin, A. Almotarreb, H. W. K. Pang, K. Michael, E. J. Pereira, P. W. Munt, M. F. Fitzpatrick, A. S. Revishvili, G. Simonyan, T. Dzhordzhikiya, O. Sopov, V. Kalinin, E. T. Locati, A. M. Vecchi, G. Cattafi, A. Sachero, M. Lunati, S. Sayah, A. Alizadeh, N. Nazari, M. Hekmat, M. Moradi, M. Zeighami, H. Ghanji, K. Suzuki, M. Takagi, K. Maeda, H. Tatsumi, P. Vieira, H. Reis, A. Toth, H. Vago, P. Takacs, E. Edes, A. Marki, G. Y. Balazs, K. Huttl, B. Merkely, F. Lainis, M. M. Buckley, E. J. Johns, C. M. Seifer, L. Daba, K. Liebrecht, W. Piwowarska, J. Toquero Ramos, E. Perez Pereira, C. Mitroi, V. Castro Urda, J. M. Fernandez Villanueva, A. Corona Figueroa, L. Hernandez Reina, I. Fernandez Lozano, A. Bartoletti, P. Bocconcelli, S. Giuli, R. Massa, C. Svetlich, G. Tarsi, F. Tronconi, E. Vitale, P. Stryjewski, M. Wegrzynowska, A. Lousinha, J. Labandeiro, E. Antunes, S. Silva, S. Alves, A. Timoteo, M. Oliveira, R. Cruz Ferreira, and J. Jedrzejczyk-Spaho

Subjects
medicine.medical_specialty, Voltage-dependent calcium channel, business.industry, medicine.drug_class, Umbilical artery, 030204 cardiovascular system & hematology, Cyclase, 3. Good health, Low testosterone levels, 03 medical and health sciences, 0302 clinical medicine, Bkca channel, Endocrinology, Physiology (medical), Internal medicine, medicine.artery, Natriuretic peptide, Medicine, 030212 general & internal medicine, Cardiology and Cardiovascular Medicine, business, Ionic Channels
Abstract

Inthelastdecadesseveralinvestigatorshavesuggestedtheassociationofandrogenswithhypertension. Recently, some studies have shown that the incidence of cardiovascular diseases is increased in men with low testosterone levels, suggesting a protective role of androgens. Hypertension is one of the mostcommonproblemsinpregnancythatcomplicates5-10 %ofpregnancies.Anincreaseofmorbidity wasobservedinbabiesfrompregnantwomenwithhypertension.However,thepathogenesisremains unclearandthislimitstheabilitytopreventandtreatthispathology.Thebeneficialeffectsofandrogens for vascular system are associated with their ability to cause vasorelaxation. Inhuman vessels, this non genomiceffectofandrogensappeartobeduetoactivationoflargeconductancecalcium-activatedpotassiumchannels(BKCa)andvoltagegatedpotassiumchannels(KV)whichisinducedbycGMPincrease andaconsequentactivationofcGMP-dependentproteinkinase(PKG).Ontheotherhand,thegenomic effects of androgens concerning ionic channels are almost unknown. Our previous studies suggested that androgens increase the expression of BKCa channels and decrease expression of L-type calcium channels (LTCC). The aim of this work was to analyze the genomic effects of androgens on theexpressionofotherproteinsinvolvedintheregulationofvascularcontractility,suchassolubleguanylate cyclase (sGC), the natriuretic peptide receptor-A (NPRA) and PKG. This study also aimed to compare the expression levels of these proteins in human umbilical artery (HUA) from normotensive andhypertensivepregnantwomen.ToachievethesegoalsrealtimePCRwasperformedusingsmooth

Published
2011
Full Text
View/download PDF

6. Flash Presentations I

Author

H. Ino, C. Sprenger, G. Breithardt, K. G. Haeusler, T. Meinertz, U. Ravens, G. Steinbeck, U. Tebbe, M. Oeff, R. Pisters, R. Nieuwlaat, M. H. Prins, J. Y. Le Heuzey, A. P. Maggioni, A. J. Camm, H. J. G. M. Crijns, C. Torp-Pedersen, H. J. Crijns, R. L. Page, S. J. Connolly, S. H. Hohnloser, R. Sehra, D. Krummen, C. Briggs, W.- J. Rappel, S. Narayan, H. U. Simon, M. Horack, J. Senges, E. Hoffmann, S. Willems, S. Spitzer, K. H. Kuck, J. Brachmann, A. Revishvili, G. Matsonashvili, E. Labartkava, T. Dzhordzhikiya, S. Serguladze, A. Shmul, B. Kvasha, C. E. B. Lima, M. Martinelli, R. Alkmim-Teixeira, S. A. D. Nishioka, S. Siqueira, L. D. Jesus, M. Wajngarten, R. Costa, P. Ferrero, P. De Filippo, P. Ferrari, R. Brambilla, F. Cantu, J. Pachon, E. Pachon M, T. J Lobo, J. C. Pachon, M. Z. Pachon, T. Santillana P, A. D. Jatene, A. M. Sinha, D. Andresen, B. Schumacher, J. Tebbenjohanns, S. Castrejon Castrejon, A. Perez-Silva, D. Doiny, A. Estrada, M. Ortega, J. L. Lopez-Sendon, J. L. Merino, P. Jais, F. Sacher, N. Derval, A. Jadidi, P. Maury, I. Nault, M. Hocini, M. Haissaguerre, E. Pokushalov, A. Romanov, S. Artemenko, V. Shabanov, and A. Turov

Subjects
Physiology (medical), Cardiology and Cardiovascular Medicine
Published
2011
Full Text
View/download PDF

7. Physical models of collective cell motility: from cell to tissue.

Author

B A Camley and W-J Rappel

Subjects
*CELL motility, *CELL communication
Abstract

In this article, we review physics-based models of collective cell motility. We discuss a range of techniques at different scales, ranging from models that represent cells as simple self-propelled particles to phase field models that can represent a cell’s shape and dynamics in great detail. We also extensively review the ways in which cells within a tissue choose their direction, the statistics of cell motion, and some simple examples of how cell–cell signaling can interact with collective cell motility. This review also covers in more detail selected recent works on collective cell motion of small numbers of cells on micropatterns, in wound healing, and the chemotaxis of clusters of cells. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results