Sep 1, 1976

Interaction of anesthesia, beta-receptor blockade, and blood loss in dogs with induced myocardial infarction

Anesthesiology
C Prys-RobertsW A Ryder

Abstract

The cardiovascular effects of halothane-nitrous oxide anesthesia, and beta-receptor blockade with either propranolol or practolol, were studied in 15 dogs in which severe myocardial infarction had been induced ten days earlier. The hemodynamic responses to blood loss amounting to 25 per cent of estimated blood volume, and its subsequent replacement, were studied before and after induction of beta-receptor blockade. In terms of cardiac output and aortic blood flow acceleration, cardiac performance in the absence of beta-blockade was markedly impaired during steady-state anesthesia, compared with corresponding values in normal dogs. Practolol (2.0 mg/kg) administered during anesthesia induced no significant circulatory change other than a 14 per cent decrease in heart rate and a 25 per cent increase in strode volum. Propranolol (0.3 mg/kg) caused a comparable reduction of heart rate, but significantly reduced cardiac output (-27 per cent), aortic blood flow acceleration (-26 per cent), and peak LV power (-19 per cent), and increased systemic vascular resistance (+49 per cent). The two drugs caused comparable shifts of the isoproterenol dose-response curve during anesthesia. Graduated blood loss during anesthesia, to a total of 25...Continue Reading

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Mentioned in this Paper

Coronary Circulation
Phenylephrine Hydrochloride
Arterial Pulse Pressure
Myocardial Contraction
Halothane
Circulatory System
Total Peripheral Resistance
Practolol
Myocardial Infarction
Blood Flow

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