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Abstract

Insulin is a superior antidote for cardiovascular toxicity induced by verapamil in the anesthetized canine.

J A Kline, C A Tomaszewski, J D Schroeder and R M Raymond
Journal of Pharmacology and Experimental Therapeutics November 1993, 267 (2) 744-750;
J A Kline
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C A Tomaszewski
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J D Schroeder
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R M Raymond
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Abstract

Because of its positive inotropic effects that are independent of cyclic AMP, insulin was compared to epinephrine and glucagon as a novel treatment for cardiac toxicity from verapamil. Twenty-four alpha-chloralose-anesthetized mongrel canines of either sex were instrumented to monitor standard hemodynamic and cardiodynamic parameters and maximum elastance at end systole, via the transit-time technique, as our index of contractility. Toxicity was induced by 0.1 mg/kg/min of verapamil (i.v.), until 50% reduction in mean arterial blood pressure or complete AV dissociation for 30 min. This was followed by continuous infusion of 1.0 mg/kg/hr of verapamil during one of four treatment protocols: 1) control (0.9% NaCl, 2.0 ml/min); 2) epinephrine (1.0 micrograms/kg/min); 3) hyperinsulinemic-euglycemic (HIE) clamp (recombinant insulin at 4.0 U/min with 20% dextrose, arterial glucose clamped); or 4) glucagon (0.2-0.25-mg/kg bolus infusion followed by 150-micrograms/kg/min infusion). Treatments were continued until death or 240 min after which time surviving animals received a 3.0-mg/kg additional bolus of verapamil. Verapamil decreased all hemodynamic parameters during titration. All controls died within 85 min. All treatments tended to improve hemodynamics; however, HIE significantly improved maximum elastance at end systole, left ventricular end diastolic pressure and coronary artery blood flow vs. other treatments (P < .05, repeated measures). Glucagon transiently restored sinus rhythm (four animals), but in all cases reverted to A-V dissociation, coincident with sharp decreases in circumflex artery blood flow and contractility.(ABSTRACT TRUNCATED AT 250 WORDS)

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Journal of Pharmacology and Experimental Therapeutics
Vol. 267, Issue 2
1 Nov 1993
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Abstract

Insulin is a superior antidote for cardiovascular toxicity induced by verapamil in the anesthetized canine.

J A Kline, C A Tomaszewski, J D Schroeder and R M Raymond
Journal of Pharmacology and Experimental Therapeutics November 1, 1993, 267 (2) 744-750;

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Abstract

Insulin is a superior antidote for cardiovascular toxicity induced by verapamil in the anesthetized canine.

J A Kline, C A Tomaszewski, J D Schroeder and R M Raymond
Journal of Pharmacology and Experimental Therapeutics November 1, 1993, 267 (2) 744-750;
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