Veterinary anaesthesia and analgesia
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To determine cardiovascular responses to administration of butorphanol in isoflurane-anesthetized horses. ⋯ The results presented here confirm that butorphanol can be administered to horses during isoflurane anesthesia without adverse effects on HR and arterial blood pressure. The results imply that butorphanol can deepen the plane of anesthesia and obtund sympathetic stimulation from a surgical procedure.