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Canadian Journal of Anesthesia 48:1084-1090 (2001)
© Canadian Anesthesiologists' Society, 2001
General Anesthesia

Equi-lasting doses of rocuronium, compared to mivacurium, result in improved neuromuscular blockade in patients undergoing gynecological laparoscopy

[Des doses de durée équivalente de rocuronium, comparé au mivacurium, améliorent la curarisation chez des patientes qui subissent une laparoscopie gynécologique]

Ashraf A. Dahaba, MD MSc, Ekkehard Schweitzer, MD, Robert D. Fitzgerald, MD and Sylvia Schwarz, MD

From the Department of Anaesthesia and Intensive Care, Lainz Hospital and the Ludwig Boltzmann Institute For Economics Of Medicine In Anaesthesia and Intensive Care, Vienna, Austria.

Dr. Ashraf Dahaba, Department of Anaesthesiology and Intensive Care Medicine, Karl Franzens University, Auenbruggerplatz 29, A-8036, Graz, Austria, Europe. Phone: ++ 43 316 385 2829; Fax: ++ 43 316 385 3267; E-mail: Ashraf.Dahaba{at}kfunigraz.ac.at

Purpose: To compare equi-lasting doses of a short-acting (mivacurium) to an intermediate-acting (rocuronium) neuromuscular relaxant, with regard to intubating conditions, efficacy, number of maintenance doses, hemodynamic alterations, adverse events and costs, in patients undergoing laparoscopic gynecological surgery.

Methods: Sixty patients were randomly allocated to receive either 0.2 mg•kg-1 (3 x ED95) mivacurium or 0.5 mg•kg-1 (1.7 x ED95) rocuronium, under propofol/fentanyl anesthesia. T1, first twitch of the train-of-four (TOF) and TOF ratio (T4:T1) were used to evaluate neuromuscular block using the Relaxometer® mechanomyograph. The trachea was intubated when T1 was maximally suppressed. Neuromuscular block was maintained at 25% T1 with equi-lasting doses of 0.075 mg•kg-1 mivacurium or 0.15 mg•kg-1 rocuronium.

Results: Mean (min) ± SD mivacurium onset time (1.9 ± 0.4) was longer than that of rocuronium (1.3 ± 0.3). This did not yield a statistical difference in intubating conditions between the two groups. Interval 25–75% T1 recovery and time to 0.8 TOF recovery were prolonged following rocuronium (11.9 ± 3.9, 52.6 ± 15.5 respectively) compared to mivacurium (6.7 ± 2.3, 39.2 ± 8.1 respectively). More patients, 22/30, required mivacurium maintenance doses compared to 14/30 patients in the rocuronium group. Arterial blood pressure declined and 13/30 patients manifested erythema following mivacurium administration. The acquisition costs of rocuronium (6.93 Euro/patient) were 23% lower compared to mivacurium (8.96 Euro/patient).

Conclusion: Equi-lasting doses of rocuronium resulted in favourable intubating conditions more rapidly, improved hemodynamic stability, required less frequent administration of maintenance doses and were not associated with erythema, compared to mivacurium.




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M. El-Orbany and A. A. Dahaba
Short-acting neuromuscular blocking drugs allow better control of OR time
Can J Anesth, June 1, 2002; 49(6): 635 - 635.
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