Effects of high neuromuscular blocking agent dose on post-operative respiratory complications in infants and children.

Abstract

This study evaluated the association between neuromuscular blocking agent dose and post-operative respiratory complications in infants and children. Data from 6507 general anaesthetics provided to children aged 0-10years undergoing surgery were analysed to examine the effects of neuromuscular blocking agent dose on post-operative respiratory complications (primary endpoint) and secondary endpoints. Confounder-adjusted analyses addressed age, surgical duration, and comorbidity burden. In confounder-adjusted analyses, high doses of neuromuscular blocking agents were associated with higher risk of post-operative respiratory complications (OR 2.27; 95% CI 1.12-4.59; P=.022). The effect was modified by age (P-for-interaction=.016) towards a more substantial risk in infants ≤1year (OR 3.84; 95% CI 1.35-10.94; P=.012), by duration of surgery (P-for-interaction=.006) towards a higher difference in odds for surgeries <90minutes (OR 4.25; 95% CI 1.19-15.18; P=.026), and by ASA physical status (P-for-interaction=.015) with a greater effect among patients with higher operative risk (ASA >1: OR 3.17; 95% CI 1.43-7.04; P=.005). Neostigmine reversal did not modify the association between neuromuscular blocking agents and post-operative respiratory complications (P-for-interaction=.38). Instrumental variable analysis confirmed that high doses of neuromuscular blocking agents were associated with post-operative respiratory complications (probit coefficient 0.25; 95% CI 0.04-0.46; P=.022), demonstrating robust results regarding concerns of unobserved confounding. High dose of neuromuscular blocking agents is associated with post-operative respiratory complications. We have identified subcohorts of paediatric patients who are particularly vulnerable to the respiratory side-effects of neuromuscular blocking agents: infants, paediatric patients undergoing surgeries of short duration, and those with a high ASA risk score.