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1. Progress toward standardized diagnosis of vascular cognitive impairment: Guidelines from the Vascular Impairment of Cognition Classification Consensus Study

Author

Skrobot, Olivia A., Black, Sandra E., Chen, Christopher, DeCarli, Charles, Erkinjuntti, Timo, Ford, Gary A., Kalaria, Rajesh N., O'Brien, John, Pantoni, Leonardo, Pasquier, Florence, Roman, Gustavo C., Wallin, Anders, Sachdev, Perminder, Skoog, Ingmar, VICCCS Group, Taragano, F. E., Kril, J., Cavalieri, M., Jellinger, K. A., Kovacs, G. G., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., De Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J., Lenoir, H., Tsatali, M., Tsolaki, M., Sundar, U., Coen, R. F., Korczyn, A. D., Altieri, M., Baldereschi, M., Caltagirone, C., Caravaglios, G., Di Carlo, A., Di Piero, V., Gainotti, G., Galluzzi, S., Logroscino, G., Mecocci, P., Moretti, D. V., Padovani, A., Fukui, T., Ihara, M., Mizuno, T., Kim, S. Y., Akinyemi, R., Baiyewu, O., Ogunniyi, A., Szczudlik, A., Bastos-Leite, A. J., Firmino, H., Massano, J., Verdelho, A., Kruglov, L. S., Ikram, M. K., Kandiah, N., Arana, E., Barroso-Ribal, J., Calatayud, T., Cruz-Jentoft, A. J., López-Pousa, S., Martinez-Lage, P., Mataro, M., Börjesson-Hanson, A., Englund, E., Laukka, E. J., Qiu, C., Viitanen, M., Biessels, G. J., De Leeuw, F.-E., Den Heijer, T., Exalto, L. G., Kappelle, L. J., Prins, N. D., Richard, E., Schmand, B., Van Den Berg, E., Van Der Flier, W. M., Bilgic, B., Allan, L. M., Archer, J., Attems, J., Bayer, A., Blackburn, D., Brayne, C., Bullock, R., Connelly, P. J., Farrant, A., Fish, M., Harkness, K., Ince, P. G., Langhorne, P., Mann, J., Matthews, F. E., Mayer, P., Pendlebury, S. T., Perneczky, R., Peters, R., Smithard, D., Stephan, B. C., Swartz, J. E., Todd, S., Werring, D. J., Wijayasiri, S. N., Wilcock, G., Zamboni, G., Au, R., Borson, S., Bozoki, A., Browndyke, J. N., Corrada, M. M., Crane, P. K., Diniz, B. S., Etcher, L., Fillit, H., Greenberg, S. M., Grinberg, L. T., Hurt, S. W., Lamar, M., Mielke, M., Ott, B. R., Perry, G., Powers, W. J., Ramos-Estebanez, C., Reed, B., Roberts, R. O., Romero, J. R., Saykin, A. J., Seshadri, S., Silbert, L., Stern, Yaakov, Zarow, C., Ben-Shlomo, Yoav, Passmore, Anthony P., Love, Seth, and Kehoe, Patrick G.

Subjects
Cognition disorders, Cognition disorders--Diagnosis, FOS: Clinical medicine, Neurosciences
Abstract

Introduction: Progress in understanding and management of vascular cognitive impairment (VCI) has been hampered by lack of consensus on diagnosis, reflecting the use of multiple different assessment protocols. A large multinational group of clinicians and researchers participated in a two-phase Vascular Impairment of Cognition Classification Consensus Study (VICCCS) to agree on principles (VICCCS-1) and protocols (VICCCS-2) for diagnosis of VCI. We present VICCCS-2. Methods: We used VICCCS-1 principles and published diagnostic guidelines as points of reference for an online Delphi survey aimed at achieving consensus on clinical diagnosis of VCI. Results: Six survey rounds comprising 65–79 participants agreed guidelines for diagnosis of VICCCS-revised mild and major forms of VCI and endorsed the National Institute of Neurological Disorders–Canadian Stroke Network neuropsychological assessment protocols and recommendations for imaging. Discussion: The VICCCS-2 suggests standardized use of the National Institute of Neurological Disorders–Canadian Stroke Network recommendations on neuropsychological and imaging assessment for diagnosis of VCI so as to promote research collaboration.

Published
2018
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2. Progress toward standardized diagnosis of vascular cognitive impairment: Guidelines from the Vascular Impairment of Cognition Classification Consensus Study

Author

Skrobot, O. A., Black, S. E., Chen, C., Decarli, C., Erkinjuntti, T., Ford, G. A., Kalaria, R. N., O'Brien, J., Pantoni, L., Pasquier, F., Roman, G. C., Wallin, A., Sachdev, P., Skoog, I., Taragano, F. E., Kril, J., Cavalieri, M., Jellinger, K. A., Kovacs, G. G., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J., Lenoir, H., Tsatali, M., Tsolaki, M., Sundar, U., Coen, R. F., Korczyn, A. D., Altieri, M., Baldereschi, M., Caltagirone, C., Caravaglios, G., Di Carlo, A., Di Piero, V., Gainotti, Guido, Galluzzi, S., Logroscino, G., Mecocci, P., Moretti, D. V., Padovani, A., Fukui, T., Ihara, M., Mizuno, T., Kim, S. Y., Akinyemi, R., Baiyewu, O., Ogunniyi, A., Szczudlik, A., Bastos-Leite, A. J., Firmino, H., Massano, J., Verdelho, A., Kruglov, L. S., Ikram, M. K., Kandiah, N., Arana, E., Barroso-Ribal, J., Calatayud, T., Cruz-Jentoft, A. J., Lopez-Pousa, S., Martinez-Lage, P., Mataro, M., Borjesson-Hanson, A., Englund, E., Laukka, E. J., Qiu, C., Viitanen, M., Biessels, G. J., de Leeuw, F. -E., den Heijer, T., Exalto, L. G., Kappelle, L. J., Prins, N. D., Richard, E., Schmand, B., van den Berg, E., van der Flier, W. M., Bilgic, B., Allan, L. M., Archer, J., Attems, J., Bayer, A., Blackburn, D., Brayne, C., Bullock, R., Connelly, P. J., Farrant, A., Fish, M., Harkness, K., Ince, P. G., Langhorne, P., Mann, J., Matthews, F. E., Mayer, P., Pendlebury, S. T., Perneczky, R., Peters, R., Smithard, D., Stephan, B. C., Swartz, J. E., Todd, S., Werring, D. J., Wijayasiri, S. N., Wilcock, G., Zamboni, G., Au, R., Borson, S., Bozoki, A., Browndyke, J. N., Corrada, M. M., Crane, P. K., Diniz, B. S., Etcher, L., Fillit, H., Greenberg, S. M., Grinberg, L. T., Hurt, S. W., Lamar, M., Mielke, M., Ott, B. R., Perry, G., Powers, W. J., Ramos-Estebanez, C., Reed, B., Roberts, R. O., Romero, J. R., Saykin, A. J., Seshadri, S., Silbert, L., Stern, Y., Zarow, C., Ben-Shlomo, Y., Passmore, A. P., Love, S., Kehoe, P. G., Gainotti G., Skrobot, O. A., Black, S. E., Chen, C., Decarli, C., Erkinjuntti, T., Ford, G. A., Kalaria, R. N., O'Brien, J., Pantoni, L., Pasquier, F., Roman, G. C., Wallin, A., Sachdev, P., Skoog, I., Taragano, F. E., Kril, J., Cavalieri, M., Jellinger, K. A., Kovacs, G. G., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J., Lenoir, H., Tsatali, M., Tsolaki, M., Sundar, U., Coen, R. F., Korczyn, A. D., Altieri, M., Baldereschi, M., Caltagirone, C., Caravaglios, G., Di Carlo, A., Di Piero, V., Gainotti, Guido, Galluzzi, S., Logroscino, G., Mecocci, P., Moretti, D. V., Padovani, A., Fukui, T., Ihara, M., Mizuno, T., Kim, S. Y., Akinyemi, R., Baiyewu, O., Ogunniyi, A., Szczudlik, A., Bastos-Leite, A. J., Firmino, H., Massano, J., Verdelho, A., Kruglov, L. S., Ikram, M. K., Kandiah, N., Arana, E., Barroso-Ribal, J., Calatayud, T., Cruz-Jentoft, A. J., Lopez-Pousa, S., Martinez-Lage, P., Mataro, M., Borjesson-Hanson, A., Englund, E., Laukka, E. J., Qiu, C., Viitanen, M., Biessels, G. J., de Leeuw, F. -E., den Heijer, T., Exalto, L. G., Kappelle, L. J., Prins, N. D., Richard, E., Schmand, B., van den Berg, E., van der Flier, W. M., Bilgic, B., Allan, L. M., Archer, J., Attems, J., Bayer, A., Blackburn, D., Brayne, C., Bullock, R., Connelly, P. J., Farrant, A., Fish, M., Harkness, K., Ince, P. G., Langhorne, P., Mann, J., Matthews, F. E., Mayer, P., Pendlebury, S. T., Perneczky, R., Peters, R., Smithard, D., Stephan, B. C., Swartz, J. E., Todd, S., Werring, D. J., Wijayasiri, S. N., Wilcock, G., Zamboni, G., Au, R., Borson, S., Bozoki, A., Browndyke, J. N., Corrada, M. M., Crane, P. K., Diniz, B. S., Etcher, L., Fillit, H., Greenberg, S. M., Grinberg, L. T., Hurt, S. W., Lamar, M., Mielke, M., Ott, B. R., Perry, G., Powers, W. J., Ramos-Estebanez, C., Reed, B., Roberts, R. O., Romero, J. R., Saykin, A. J., Seshadri, S., Silbert, L., Stern, Y., Zarow, C., Ben-Shlomo, Y., Passmore, A. P., Love, S., Kehoe, P. G., and Gainotti G.

Abstract

Introduction: Progress in understanding and management of vascular cognitive impairment (VCI) has been hampered by lack of consensus on diagnosis, reflecting the use of multiple different assessment protocols. A large multinational group of clinicians and researchers participated in a two-phase Vascular Impairment of Cognition Classification Consensus Study (VICCCS) to agree on principles (VICCCS-1) and protocols (VICCCS-2) for diagnosis of VCI. We present VICCCS-2. Methods: We used VICCCS-1 principles and published diagnostic guidelines as points of reference for an online Delphi survey aimed at achieving consensus on clinical diagnosis of VCI. Results: Six survey rounds comprising 65–79 participants agreed guidelines for diagnosis of VICCCS-revised mild and major forms of VCI and endorsed the National Institute of Neurological Disorders–Canadian Stroke Network neuropsychological assessment protocols and recommendations for imaging. Discussion: The VICCCS-2 suggests standardized use of the National Institute of Neurological Disorders–Canadian Stroke Network recommendations on neuropsychological and imaging assessment for diagnosis of VCI so as to promote research collaboration.

Published
2018

3. The Vascular Impairment of Cognition Classification Consensus Study

Author

Skrobot, Olivia A., Love, Seth, Kehoe, Patrick G., O'Brien, John, Black, Sandra E., Chen, Christopher, DeCarli, Charles, Erkinjuntti, Timo, Ford, Gary A., Kalaria, Rajesh N., Pantoni, Leonardo, Pasquier, Florence, Roman, Gustavo C., Wallin, Anders, Sachdev, Perminder S., Skoog, Ingmar, Ben-Shlomo, Yoav, Passmore, Anthony P., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J-J., Lenoir, H., Tsatali, M., Tsolaki, Magda, Sundar, U., Ikram, M. K., Biessels, G. J., Exalto, L. G., Kappelle, L. J., van den Berg, E., Swartz, J. E., and VICCCS group

Subjects
Consensus, Epidemiology, Health Policy, Clinical Neurology, Guidelines, Criteria, Delphi, Vascular dementia, Cellular and Molecular Neuroscience, Psychiatry and Mental health, Developmental Neuroscience, Journal Article, Vascular cognitive impairment, Geriatrics and Gerontology
Abstract

Introduction Numerous diagnostic criteria have tried to tackle the variability in clinical manifestations and problematic diagnosis of vascular cognitive impairment (VCI) but none have been universally accepted. These criteria have not been readily comparable, impacting on clinical diagnosis rates and in turn prevalence estimates, research, and treatment. Methods The Vascular Impairment of Cognition Classification Consensus Study (VICCCS) involved participants (81% academic researchers) from 27 countries in an online Delphi consensus study. Participants reviewed previously proposed concepts to develop new guidelines. Results VICCCS had a mean of 122 (98–153) respondents across the study and a 67% threshold to represent consensus. VICCCS redefined VCI including classification of mild and major forms of VCI and subtypes. It proposes new standardized VCI-associated terminology and future research priorities to address gaps in current knowledge. Discussion VICCCS proposes a consensus-based updated conceptualization of VCI intended to facilitate standardization in research.

Published
2017

4. The Vascular Impairment of Cognition Classification Consensus Study

Author

ZL Cerebrovasculaire Ziekten Medisch, ZL Algemene Neurologie Medisch, Circulatory Health, Brain, Opleiding Neurologie, Projectafdeling VCI, MS KNO, Skrobot, Olivia A., Love, Seth, Kehoe, Patrick G., O'Brien, John, Black, Sandra E., Chen, Christopher, DeCarli, Charles, Erkinjuntti, Timo, Ford, Gary A., Kalaria, Rajesh N., Pantoni, Leonardo, Pasquier, Florence, Roman, Gustavo C., Wallin, Anders, Sachdev, Perminder S., Skoog, Ingmar, Ben-Shlomo, Yoav, Passmore, Anthony P., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J-J., Lenoir, H., Tsatali, M., Tsolaki, Magda, Sundar, U., Ikram, M. K., Biessels, G. J., Exalto, L. G., Kappelle, L. J., van den Berg, E., Swartz, J. E., VICCCS group, ZL Cerebrovasculaire Ziekten Medisch, ZL Algemene Neurologie Medisch, Circulatory Health, Brain, Opleiding Neurologie, Projectafdeling VCI, MS KNO, Skrobot, Olivia A., Love, Seth, Kehoe, Patrick G., O'Brien, John, Black, Sandra E., Chen, Christopher, DeCarli, Charles, Erkinjuntti, Timo, Ford, Gary A., Kalaria, Rajesh N., Pantoni, Leonardo, Pasquier, Florence, Roman, Gustavo C., Wallin, Anders, Sachdev, Perminder S., Skoog, Ingmar, Ben-Shlomo, Yoav, Passmore, Anthony P., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J-J., Lenoir, H., Tsatali, M., Tsolaki, Magda, Sundar, U., Ikram, M. K., Biessels, G. J., Exalto, L. G., Kappelle, L. J., van den Berg, E., Swartz, J. E., and VICCCS group

Published
2017

5. The Vascular Impairment of Cognition Classification Consensus Study

Author

Skrobot, O. A., Love, S., Kehoe, P. G., O'Brien, J., Black, S., Chen, C., DeCarli, C., Erkinjuntti, T., Ford, G. A., Kalaria, R. N., Pantoni, L., Pasquier, F., Roman, G. C., Wallin, A., Sachdev, P., Kril, J., Skoog, I., Ben-Shlomo, Y., Passmore, A. P., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J., Lenoir, H., Tsatali, M., Tsolaki, M., Sundar, U., Coen, R. F., Korczyn, A. D., Altieri, M., Baldereschi, M., Caltagirone, C., Caravaglios, G., Di Carlo, A., DI Piero, V., Gainotti, G., Galluzzi, S., Logroscino, G., Mecocci, P., Moretti, D. V., Padovani, A., Fukui, T., Ihara, M., Mizuno, T., Kim, S. Y., Akinyemi, R., Baiyewu, O., Ogunniyi, A., Szczudlik, A., Bastos-Leite, A. J., Firmino, H., Massano, J., Verdelho, A., Kruglov, L. S., Ikram, M. K., Kandiah, N., Arana, E., Barroso-Ribal, J., Calatayud, T., Cruz-Jentoft, A. J., Lopez-Pousa, S., Martinez-Lage, P., Mataro, M., Borjesson-Hanson, A., Englund, E., Laukka, E. J., Qiu, C., Viitanen, M., Biessels, G. J., de Leeuw, F. -E., den Heijer, T., Exalto, L. G., Kappelle, L. J., Prins, N. D., Richard, E., Schmand, B., van den Berg, E., van der Flier, W. M., Bilgic, B., Allan, L. M., Archer, J., Attems, J., Bayer, A., Blackburn, D., Brayne, C., Bullock, R., Connelly, P. J., Farrant, A., Fish, M., Harkness, K., Ince, P. G., Langhorne, P., Mann, J., Matthews, F. E., Mayer, P., Pendlebury, S. T., Perneczky, R., Peters, R., Smithard, D., Stephan, B. C., Swartz, J. E., Todd, S., Werring, D. J., Wijayasiri, S. N., Wilcock, G., Zamboni, G., Au, R., Borson, S., Bozoki, A., Browndyke, J. N., Corrada, M. M., Crane, P. K., Diniz, B. S., Etcher, L., Fillit, H., Greenberg, S. M., Grinberg, L. T., Hurt, S. W., Lamar, M., Mielke, M., Ott, B. R., Perry, G., Powers, W. J., Ramos-Estebanez, C., Reed, B., Roberts, R. O., Romero, J. R., Saykin, A. J., Seshadri, S., Silbert, L., Stern, Y., Zarow, C., Gainotti G., Logroscino G. (ORCID:0000-0003-1301-5343), Skrobot, O. A., Love, S., Kehoe, P. G., O'Brien, J., Black, S., Chen, C., DeCarli, C., Erkinjuntti, T., Ford, G. A., Kalaria, R. N., Pantoni, L., Pasquier, F., Roman, G. C., Wallin, A., Sachdev, P., Kril, J., Skoog, I., Ben-Shlomo, Y., Passmore, A. P., Engelborghs, S., Lafosse, C., Bertolucci, P. H., Brucki, S., Caramelli, P., de Toledo Ferraz Alves, T. C., Bocti, C., Fulop, T., Hogan, D. B., Hsiung, G. R., Kirk, A., Leach, L., Robillard, A., Sahlas, D. J., Guo, Q., Tian, J., Hokkanen, L., Jokinen, H., Benisty, S., Deramecourt, V., Hauw, J., Lenoir, H., Tsatali, M., Tsolaki, M., Sundar, U., Coen, R. F., Korczyn, A. D., Altieri, M., Baldereschi, M., Caltagirone, C., Caravaglios, G., Di Carlo, A., DI Piero, V., Gainotti, G., Galluzzi, S., Logroscino, G., Mecocci, P., Moretti, D. V., Padovani, A., Fukui, T., Ihara, M., Mizuno, T., Kim, S. Y., Akinyemi, R., Baiyewu, O., Ogunniyi, A., Szczudlik, A., Bastos-Leite, A. J., Firmino, H., Massano, J., Verdelho, A., Kruglov, L. S., Ikram, M. K., Kandiah, N., Arana, E., Barroso-Ribal, J., Calatayud, T., Cruz-Jentoft, A. J., Lopez-Pousa, S., Martinez-Lage, P., Mataro, M., Borjesson-Hanson, A., Englund, E., Laukka, E. J., Qiu, C., Viitanen, M., Biessels, G. J., de Leeuw, F. -E., den Heijer, T., Exalto, L. G., Kappelle, L. J., Prins, N. D., Richard, E., Schmand, B., van den Berg, E., van der Flier, W. M., Bilgic, B., Allan, L. M., Archer, J., Attems, J., Bayer, A., Blackburn, D., Brayne, C., Bullock, R., Connelly, P. J., Farrant, A., Fish, M., Harkness, K., Ince, P. G., Langhorne, P., Mann, J., Matthews, F. E., Mayer, P., Pendlebury, S. T., Perneczky, R., Peters, R., Smithard, D., Stephan, B. C., Swartz, J. E., Todd, S., Werring, D. J., Wijayasiri, S. N., Wilcock, G., Zamboni, G., Au, R., Borson, S., Bozoki, A., Browndyke, J. N., Corrada, M. M., Crane, P. K., Diniz, B. S., Etcher, L., Fillit, H., Greenberg, S. M., Grinberg, L. T., Hurt, S. W., Lamar, M., Mielke, M., Ott, B. R., Perry, G., Powers, W. J., Ramos-Estebanez, C., Reed, B., Roberts, R. O., Romero, J. R., Saykin, A. J., Seshadri, S., Silbert, L., Stern, Y., Zarow, C., Gainotti G., and Logroscino G. (ORCID:0000-0003-1301-5343)

Abstract

Introduction Numerous diagnostic criteria have tried to tackle the variability in clinical manifestations and problematic diagnosis of vascular cognitive impairment (VCI) but none have been universally accepted. These criteria have not been readily comparable, impacting on clinical diagnosis rates and in turn prevalence estimates, research, and treatment. Methods The Vascular Impairment of Cognition Classification Consensus Study (VICCCS) involved participants (81% academic researchers) from 27 countries in an online Delphi consensus study. Participants reviewed previously proposed concepts to develop new guidelines. Results VICCCS had a mean of 122 (98–153) respondents across the study and a 67% threshold to represent consensus. VICCCS redefined VCI including classification of mild and major forms of VCI and subtypes. It proposes new standardized VCI-associated terminology and future research priorities to address gaps in current knowledge. Discussion VICCCS proposes a consensus-based updated conceptualization of VCI intended to facilitate standardization in research.

Published
2017

7. Ionic dependencies of tetrodotoxin-resistant action potentials in trigeminal root ganglion neurons.

Author

Hsiung GR and Puil E

Subjects
4-Aminopyridine pharmacology, Action Potentials drug effects, Animals, Calcium pharmacology, Cisplatin pharmacology, Doxorubicin pharmacology, Electrodes, Guinea Pigs, In Vitro Techniques, Lidocaine analogs & derivatives, Lidocaine pharmacology, Potassium Channels drug effects, Potassium Channels physiology, Sodium pharmacology, Tetraethylammonium, Tetraethylammonium Compounds pharmacology, Trigeminal Ganglion cytology, Neurons drug effects, Tetrodotoxin pharmacology, Trigeminal Ganglion drug effects
Abstract

Action potentials recorded in vitro from the perikarya of trigeminal root ganglion neurons (guinea-pig) were examined for their sensitivities to blockers of specific ion channels or to removal of certain ionic species in the bathing media. The majority (approximately 65%) of the 137 neurons exhibited action potentials following application of the Na(+)-channel blocker, tetrodotoxin. This group of neurons was selected for further investigation under conditions of extracellular K(+)-channel blockade with tetraethylammonium and 4-aminopyridine. Long-duration action potentials consisting of two distinct components could be evoked under such conditions. The fast component of the spike was abolished in Na(+)-deficient perfusion media and was sensitive to blockade by extracellular lidocaine or intracellular QX-222 applications. It is likely that the slow component was mediated mainly by Ca2+, but in Ca2(+)-deficient media. Mg2(+)-influx may have contributed to the small voltage response. The amplitude and shape of the slow component was unaffected by applications of lidocaine or QX-222. Self-sustained repetitive firing was also observed in 11 neurons in the above conditions. This activity persisted even under conditions of severe deficiencies in extracellular [Ca2+] or [Na+]. Two distinct but overlapping K(+)-conductances that were sensitive to blockade by internal Cs(+)-application and insensitive to applications of tetraethylammonium and 4-aminopyridine, appear to mediate the afterhyperpolarization of the long-duration spike. One portion of the afterhyperpolarization was 60-150 ms in duration and was unaffected by removal of Ca2+ from the extracellular media, while the other had a time-course lasting 150-250 ms and was abolished by removal of external Ca2+. In some neurons, these K(+)-conductances were blocked by high doses of doxorubicin or cisplatin. The results show that at least two ion species (Na+ and Ca2+) contribute to the formation of the tetrodotoxin-resistant, long-duration action potential in trigeminal root ganglion neurons during selective K(+)-conductance blockade and also provide evidence for Mg2+ involvement in the generation of this voltage response.

Published
1990
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