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Protective effects of different beta-blocking agents against electroshock lethality in mice
Journal De Pharmacologie
|July 1, 1983
Summary
Phenytoin and propranolol effectively protected animals from lethal electroshock. Quinidine-like activity (QLA) appears more crucial than beta-blocking effects for this protective outcome.
Area of Science:
- Pharmacology
- Neuroscience
- Cardiology
Background:
- Anticonvulsants like phenytoin are explored for neuroprotective effects.
- Beta-blocking agents possess varying pharmacological properties, including quinidine-like activity (QLA) and intrinsic sympathomimetic activity (ISA).
Purpose of the Study:
- To compare the efficacy of phenytoin and beta-blockers in protecting against electroshock lethal dose (ELD).
- To investigate the role of QLA and ISA in the protective effects against electroshock.
Main Methods:
- Phenytoin and three beta-blocking agents (propranolol, practolol, metoprolol) were administered to animals.
- Animals were then subjected to an electroshock lethal dose (ELD).
- Survival rates and dose-response relationships were analyzed.
Main Results:
- Phenytoin (15 mg/kg) and propranolol (70 mg/kg) provided complete protection against ELD.
- Metoprolol required higher doses (130 mg/kg) for effectiveness.
- Practolol showed partial protection at low doses, but higher doses exacerbated lethality due to ISA.
Conclusions:
- Quinidine-like activity (QLA) is a significant factor in conferring protection against electroshock lethality.
- Beta-blocking activity alone is less critical than QLA for this specific protective effect.
- The intrinsic sympathomimetic activity (ISA) of some beta-blockers may be detrimental in this context.