Effect of isoflurane versus propofol-remifentanil anesthesia on neuromuscular blockade and hemodynamic responses by cisatracurium bolus injection

Background: Inhalational anesthetics potentiate nondepolarizing muscle relaxants. Cisatracurium is a recently introduced neuromuscular blocker in Korea. We studied the effect of inhalational anesthesia and total intravenous anesthesia (TIVA) on neuromuscular blockades and hemodynamic responses by cisatracurium bolus injection. Methods: Forty patients undergoing elective surgery were randomly divided into isoflurane and propofolremifentanil groups. A bolus dose of cisatracurium of 0.15 mg/kg (3 x ED95) was administered after induction and the onset time and clinical duration of action were recorded. The nueromuscular blockade was monitored using train-offour (TOF) stimulation. Hemodynamic parameters were also recorded. Results: Onset time was 194.0 +/- 39.1 sec in the isoflurane group and 226.5 +/- 62.2 sec in the propofol-remifentanil group. Clinical duration of action was 49.2 +/- 9.0 min in the isoflurane group and 43.0 +/- 9.2 min in the propofolremifentanil group. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) immediately before intubation decreased in the propofol-remifentanil group. Heart rate (HR), SBP and DBP 1 and 3 min after tracheal intubation increased in the isoflurane group. Conclusions: Onset time was similar between isoflurane and propofol-remifentanil anesthesia. Clinical duration of action was significantly longer in isoflurane anesthesia. SBP and DBP immediately before intubation and HR, SBP and DBP 1 and 3 min after tracheal intubation were significantly different between the two groups.