Seventy neonatal to adolescent general surgical patients were studied to create an individual dose-response curve for the long-acting neuromuscular blocking agents, alcuronium and d-tubocurarine. The mean (SEM) ED95 of alcuronium was 196 (9), 271 (13) and 243 (8) μg/kg in infants, children and adolescents, respectively (P < 0.01). d-tubocurarine showed a similar age dependent dose-response relationship. ED95 doses were 414 (40), 499 (41) and 445 (31) μg/kg, respectively. The onset time (time from intravenous administration to maximal effect) following equipotent dosages was 40–50% shorter in infants than in children or adolescents (1.5 vs 2.7 minutes, P < 0.05).
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