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  • Title: Recovery rate of the cardiovascular system in rabbits following short-term halothane anesthesia.
    Author: Sartick M, Eldridge ML, Johnson JA, Kurz KD, Fowler WL, Payne CG.
    Journal: Lab Anim Sci; 1979 Apr; 29(2):186-90. PubMed ID: 459413.
    Abstract:
    Mean arterial pressure, cardiac output and heart rate were determined in eight male New Zealand white rabbits while conscious and after being anesthetized with halothane plus nitrous oxide for 15 minutes. Delivery of the anesthetic agent was stopped and the measurement repeated at 15, 30, 60 and 210 minutes. In a separate experiment blood samples were obtained for plasma renin activity in six rabbits before anesthesia, after 15 minutes of halothane plus nitrous oxide administration, and again 210 minutes after cessation of the anesthesia. Later, this experiment was repeated with the same rabbits except that they were allowed to breathe room air instead of the anesthesia. The halothane anesthesia resulted in decreased mean arterial pressure and cardiac output, but these returned to the preanesthetic levels by 15 minutes after stopping the anesthesia. Heart rate increased during halothane administration, and although it tended to return toward control levels after cessation of the halothane, heart rate was still elevated 210 minutes later. Halothane plus nitrous oxide produced an increase in plasma renin activity, which then subsided to normal by 210 minutes following anesthesia; breathing room air did not result in increases in plasma renin activity. These studies revealed that although short-term anesthesia with halothane plus nitrous oxide resulted in cardiovascular changes in rabbits, after cessation of the anesthetic agent the cardiovascular system quickly returned to normal.
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