Ninety-nine unselected patients were given a standardized general anaesthetic with fentanyl 1.5 jag · kg-1 every 30 minutes and were randomly divided into three equal Groups: Group I patients received naloxone 0.1 mg, Group II naloxone 0.2 mg, and Group III naloxone 0.4 mg, at the end of operation and after the reversal of neuromuscular blockade. After administration of naloxone systolic blood pre...... hiện toàn bộ