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British Journal of Anaesthesia, Vol 84, Issue 1 63-66, Copyright © 2000 by Oxford University Press

ARTICLES

Fentanyl augments block of sympathetic responses to skin incision during sevoflurane anaesthesia in children

T Katoh, S Kobayashi, A Suzuki, S Kato, T Iwamoto, H Bito and S Sato
Department of Anaesthesiology and Intensive Care, Hamamatsu University School of Medicine, Japan.

We studied 61 healthy ASA 1 patients (aged 2-6 yr) to determine if fentanyl affects the minimum alveolar concentration which blocks adrenergic responses to skin incision (MAC-BAR) in 50% of children in the presence of 60% nitrous oxide. Patients were allocated randomly to one of three fentanyl groups to receive 0, 2 or 4 micrograms kg-1. Patients also received sevoflurane at a preselected end-tidal concentration according to an 'up-and-down' design. After a steady- state sevoflurane concentration had been maintained for at least 15 min, fentanyl was given i.v. Skin incision was performed 5 min after administration of fentanyl. The response was considered positive if heart rate (HR) or mean arterial pressure (MAP) increased by 15% or more. The MAC-BAR of sevoflurane was 1.45 MAC (95% confidence intervals 1.25-1.65 MAC), and this was reduced markedly to 0.63 MAC and 0.38 MAC by addition of fentanyl 2 and 4 micrograms kg-1, respectively. A ceiling effect was not observed and there was a significant difference between the 2 and 4 micrograms kg-1 groups.
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