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Seizure threshold to lidocaine is decreased following repeated ECS (electroconvulsive shock)

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Seizure susceptibility to lidocaine was investigated in rats which had received repeated ECS (electroconvulsive shock). In the first experiment three groups of rats received an ECS daily for 18 days, an ECS weekly for 18 weeks, and 18 sham treatments, respectively. Twelve weeks after the last ECS all rats received a lidocaine challenge (LC) in the form of an intraperitoneal (IP) injection of lidocaine (65 mg/kg). After the injection the animals were observed for occurrence of motor seizures. A total of 67% (10/15), 47% (7/15), and 0% (0/18) of the daily, weekly, and sham groups, respectively, had motor seizures in response to the LC. In the second experiment five groups of rats received an ECS daily for 0, 1, 6, 18, and 36 days, respectively. Eighteen weeks after the last ECS all rats received an LC and 0% (0/15), 13% (2/15), 20% (3/15), 53% (8/15), and 58% (7/12), respectively, developed seizures in response to the LC. In the third experiment two groups of rats received daily ECS and sham-ECS, respectively. Twenty-four hours after the last ECS all rats received an LC. A total of 60% (9/15) of the ECS group and 0% (0/10) of the sham-ECS group had seizures in response to the LC.(ABSTRACT TRUNCATED AT 250 WORDS)
Original languageEnglish
JournalPsychopharmacology
Volume111
Issue number4
Pages (from-to)495-8
Number of pages4
ISSN0033-3158
Publication statusPublished - 1993

    Research areas

  • Animals, Convulsants, Electroshock, Lidocaine, Male, Rats, Rats, Wistar, Regression Analysis, Seizures

ID: 36894972