Epileptic seizure-induced hypertension and its prevention by calcium channel blockers: a real-time study in conscious telemetered rats.
Epileptic seizures are accompanied by changes in autonomic function that in turn influence the cardiovascular system (hypertension and bradyarrhythmia). We have studied possible cardioprotective activity (during the ictal state in conscious animals) of valproic acid, nifedipine, and verapamil, alone and in combination, during pentylenetetrazole (PTZ)-induced seizures. Telemetry system was used for recording EEG, blood pressure, and heart rate in conscious, freely moving rats during seizures. We observed that PTZ-induced seizures were accompanied by hypertension and bradyarrhythmia. Pretreatment with valproic acid did not block seizure-induced hypertension and bradyarrhythmia. Nifedipine alone and in combination with valproic acid blocked seizure-induced hypertension and bradyarrhythmia significantly. We also observed that pretreatment with verapamil alone and in combination with valproic acid did not block seizure-induced hypertension and bradyarrhythmia significantly. Our results suggest that pretreatment with nifedipine alone or in combination with valproic acid provides protection against seizure-induced hypertension and bradyarrhythmia.
Beig
Mirza Irfan
MI
Dr. B.R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110 007, India.
Chandra
Ramesh
R
Talwar
Anita
A
Fahim
Mohammad
M
Katyal
Anju
A
D000818:Animals; D002121:Calcium Channel Blockers / Q000627:therapeutic use*; D003243:Consciousness / Q000502:physiology*; D004827:Epilepsy / Q000150:complications / Q000503:physiopathology / Q000517:prevention & control*; D006973:Hypertension / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013686:Telemetry / Q000379:methods
D002121:Calcium Channel Blockers