Abstract

Twelve dogs were anesthetized with halothane, methoxyflurane, pentobarbital and electricity. Groups of four animals received a premedication of saline, morphine or scopolamine. In the saline and scopolamine pre-medicated animals anesthetized with the conventional chemical agents there was a progressive decrease in rectal temperature throughout the period of anesthesia. The respiratory rate also decreased. In the same animals anesthetized with electricity, the rectal temperature and rate of respiration increased progressively for 90 min and then declined slowly. The temperature and respiratory changes seen after morphine premedication during electrical anesthesia resembled those seen with conventional, chemical anesthetic agents. It is suggested that morphine premedication would be desirable in procedures using electricity as the principal anesthetic agent.

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