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British Journal of Anaesthesia, Vol 76, Issue 1 23-28, Copyright © 1996 by The Board of Management and Trustees of the British Journal of Anaesthesia

CLINICAL INVESTIGATIONS

Vecuronium infusion requirements in paediatric patients in intensive care units: the use of acceleromyography

U. M. Hodges
Division of Anaesthetics, United Medical and Dental School, Guy's Hospital, London SE1 9RT

Neuromuscular blocking drugs in intensive care units (ICU) may cause complications, including prolonged neuromuscular block as a result of overdosage and post-ventilation muscle weakness. These may be increased by using inappropriately high infusion rates for infants, in whom published studies are scarce, and by failure to monitor neuromuscular block. There is little ICU experience of acceleromyography, which may permit more reliable monitoring. To determine appropriate vecuronium infusion rates, 12 neonates/infants (median age 4 (interquartile range (IQR) 2-5) months) and 18 children (median age 3.07 (2-10 yr) were studied. The vecuronium infusion rate was adjusted to maintain train-of- four (TOF) at 1 response using the TOF guard accelerometer. Recovery time was measured from cessation of infusion until spontaneous TOF ratio recovery of 0.7. Neonates and infants required 45% less vecuronium (mean infusion rate 54.7 (SEM 4.23) micrograms kg-1 h-1) than older children (98.7 (7.07) micrograms kg-1 h-1) and had faster recovery to 70% T4/T1 (45 (IQR 20-51) min vs 65 (55-103) min), with no evidence of prolonged weakness. Routine monitoring of neuromuscular block in ICU is essential; acceleromyography is convenient and reliable.
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