Effect of timolol on autonomic neural discharge associated with ouabain-induced arrhythmia

European Journal of Pharmacology
C M Lathers

Abstract

The purpose of this study was to determine the effect of the beta-blocking agent timolol on postganglionic cardiac and preganglionic splanchnic sympathetic and vagal neural discharge, ouabain-induced arrhythmia, heart rate and mean arterial blood pressure. Cats were anesthetized with alpha-chloralose, given atropine, and pretreated with timolol (5 mg/kg, i.v. infused at a rate of 0.5 mg/kg/min for 10 min). Bolus injections of ouabain (25 microgram/kg, i.v.) were given every 15 min until the animals died; the first injection was given 15 min after the end of the timolol infusion. When compared with cats (n = 13) receiving only ouabain, timolol (n = 11 cats) increased the time to ouabain-induced arrhythmia and death from 23 +/- 3 to 48 +/- 7 and 46 +/- 3 to 76 +/- 9 min, respectively (p less than 0.05). Both heat rate and mean arterial blood pressure had decreased from 137 +/- 4 to 104 +/- 6 beats/min and 133 +/- 6 to 103 +/- 7 mm Hg, respectively (P less than 0.05); ouabain did not reverse the decreases. Neural activity monitored from the vagus and from the postganglionic cardiac and preganglionic splanchnic sympathetic nerves was not significantly altered by the infusion of timolol. The administration of ouabain after timolol d...Continue Reading

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Related Concepts

Nervousness
Depression, Chemical
Diastolic Blood Pressure
Atropine
Anti-Arrhythmia Agents
Ouabain
Antiarrhythmic [EPC]
Pressoreceptors
Atropinum, atropine
Vagus Nerve Structure

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