The authors have compared two different techniques of anaesthesia: the classical anaesthesia with benzodiazepine-analgesic (diazepam and fentanyl) and one of its variant obtained by using flunitrazepam and buprenorphine. The 45 patients submitted to gynaecological surgery were causally divided in two groups in connection with the two different anaesthesiological techniques. The clinical and statistical analysis of the collected data demonstrated the real validity of this anaesthesiological variant: either for premedication by perfect anxiolysis and sedation, or for the maintenance by low incidence on cardiocirculation system and perfect analgesia that extended its effects for many hours after surgical operation.