Tonsillectomy in children with obesity: the risk window is recovery, not the ward

Design

Systematic review and random-effects meta-analysis of 18 studies

Population

60,044 children aged under 18 having tonsillectomy, 7.8% with obesity

Primary outcome

Postoperative respiratory complications

Effect

12.2% vs 7.6%; OR 1.86 (95% CI 1.38 to 2.49), I² = 77.5%

A meta-analysis of 18 studies and 60,044 children having tonsillectomy, with or without adenoidectomy, compared respiratory complications in children with obesity (7.8% of the sample) and without.

Complications occurred in 12.2% of children with obesity and 7.6% without (OR 1.86, 95% CI 1.38 to 2.49), with high heterogeneity (I² = 77.5%). The key finding is where the excess sat: obesity raised the odds only in studies that counted events in the post-anaesthesia care unit. In studies limited to complications on the inpatient ward, obesity was not associated with more events.

This suggests extended recovery observation, rather than routine overnight admission, may be the right safeguard. A child with obesity who has no respiratory events in recovery may be suitable for same-day discharge if other criteria are met. Obstructive sleep apnoea severity, age and comorbidity still matter and were not fully separated from obesity here.

• Observe children with obesity closely in recovery after tonsillectomy, where the excess complications occurred.
• Consider same-day discharge for a child with obesity who has had no respiratory events in recovery and meets other criteria.
• Continue to admit children with severe obstructive sleep apnoea, young age or significant comorbidity overnight.
• Record BMI percentile before surgery so risk can be planned rather than discovered.

Why it matters

It challenges routine overnight admission based on obesity alone, which strains bed capacity.

Don't overread it

Observational studies with high heterogeneity; the ward-only finding comes from a subgroup comparison.

The statistics, in plain English

An odds ratio of 1.86 means the odds of a respiratory complication were nearly doubled in children with obesity. An I² of 77.5% means the studies varied considerably. Comparing studies that did and did not count recovery events is a subgroup analysis, which is weaker than a direct comparison.

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