The effects of pre-treatment with butorphanol on postanesthesia shivering in patients undergoing operation of hypogustric zone after combined spinal-epidural anesthesia

Objective To assess the effects of pre-treatment with butorphanol on postanesthesia shivering in patients undergoing operation of hypogastric zone after combined spinal-epidural anesthesia. Methods Sixty patients (ASA Ⅰ,Ⅱ) undergoing operation of hypogastric zone were randomly assigned into two groups(n = 30). Group A(test group) : The patients were injected intravenously with butorphanoi 1 mg/5 ml at the time of 10 min before combined spinal-epidural anesthesia. Group B(control group) : The patients were injected intravenously with 0.9% saline 5 ml at the same time point. The development of shivering and sedation degree was observed after the anesthesia. Results The incidence rate on shivering in test group was significantly lower than that in control group(P <0.01). While the satisfaction rate on sedation score in test group was higher than that in control group(P < 0.05). Conclusion Pre-treatment with butorphanol is effective and safe on poatanesthesia shivering in patients undergoing operation of hypogastric zone. Key words: Butorphanol;  Combined spinal-epidural anesthesia;  Shivering;  Sedation score