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Canadian Journal of Anesthesia, Vol 46, 429-432, Copyright © 1999 by Canadian Anesthesiologists' Society

ARTICLES

Sevoflurane exposure time and the neuromuscular blocking effect of vecuronium

AA Ahmed, M Kumagai, T Otake, Y Kurata and Y Amaki
Department of Anesthesia, Ain Shams University, Cairo, Egypt. kader2a@hotmail.com

PURPOSE: To determine the effect of sevoflurane exposure time on the duration of vecuronium neuromuscular blockade. METHODS: In 40 adult patients anesthesia was induced with 1.5-2 mg x kg(-1) propofol and 3-5 microg x kg(-1) fentanyl and the trachea was intubated without the aid of muscle relaxant. Patients were randomized into four groups of 10. In group 1, 0.05 mg x kg(-1) vecuronium was administered with N2O and anesthesia was maintained by propofol infusion and fentanyl. Vecuronium was administered with sevoflurane 2% in 30 patients, commencing at the same time (group 2) and at 30, and 60 min after sevoflurane (groups 3, 4). Adductor pollicis force of contraction to train-of-four ulnar nerve stimulation was recorded. Times from vecuronium injection to 95%, maximal block, and recovery times to 25% recovery were recorded. RESULTS: There were no differences in times to 95% and maximal block in the four groups. Recovery times were longer in groups 3 and 4 than in groups 2 and 1 (P < 0.01). Times to 5% recovery were 15.0 +/- 3.7, 17.8 +/- 4.8, 28.2 +/- 9.9, and 29.5 +/- 9.5, and to 25% recovery were 22.3 +/- 5.2, 27.2 +/- 6.4, 42.3 +/- 16.3, and 50.5 +/- 16.4 in groups 1, 2, 3, and 4 respectively. No differences were found between group 1 and group 2 nor between group 3 and group 4. CONCLUSION: Sevoflurane produced time-dependent potentiation of vecuronium. After 30 min exposure, 25% recovery was prolonged by 89% and after 60 min by more than 100% compared with the control group.


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Copyright © 1999 by the Canadian Anesthesiologists' Society.