New analysis from the PATS trial questions the effectiveness of sleep studies alone in guiding early surgery decisions for children with mild sleep-disordered breathing, highlighting persistent symptoms despite stable sleep parameters.
Parents and clinicians deciding what to do about a child who snores heavily but has only mild abnormalities on a sleep study often face an uneasy trade-off: operate early, or monitor and wait. New analysis from one of the largest randomised trials in paediatric sleep medicine suggests that, over 12 months, the answer is not as simple as the numbers from an overnight study might imply. According to research published in the Journal of Clinical Sleep Medicine, only a small minority of children in the watchful-waiting group showed measurable worsening on repeat polysomnography, yet many continued to have ongoing symptoms at home.
The findings come from the control arm of the Pediatric Adenotonsillectomy Trial for Snoring, or PATS, a multicentre study designed to test whether adenotonsillectomy helps children with mild sleep-disordered breathing. The protocol for PATS was published after the trial was launched to address wide variation in practice and the limited high-quality evidence guiding surgery in this group. In the secondary analysis, researchers followed 234 children aged 3 to 12.9 years who had not undergone surgery, most of whom had enlarged tonsils but only mild breathing disturbance at baseline.
The investigators used two different yardsticks for progression. One was objective: whether the obstructive apnoea-hypopnoea index, or oAHI, rose to 3 or more events an hour on a repeat sleep study. The other was symptom-based: whether caregivers reported a clinically significant score on a validated sleep questionnaire. Sleep studies were read centrally, and the study also drew on baseline information such as daytime sleepiness, quality of life, behaviour, asthma, attention-deficit hyperactivity disorder and exposure to tobacco smoke.
On the objective measure, the results were reassuring. Among the children who completed follow-up sleep studies, only 20, or 13%, progressed to the threshold used for worsening. The average baseline oAHI in the group was low, at 0.8 events an hour, and for most children the underlying physiology remained stable over the year. That fits earlier work from the PATS programme, which showed that many children with mild sleep-disordered breathing do not deteriorate rapidly and that some improve without immediate intervention.
The symptom picture was much less comforting. Of the children with follow-up questionnaire data, 110, or 57%, still had a high symptom burden after a year, and most of those cases reflected symptoms that were already present at the start rather than new problems. Even among children whose breathing scores remained technically mild, symptom persistence was common. In practical terms, the study suggests that a child can look stable in the sleep laboratory while still struggling with disturbed sleep, snoring and the downstream effects parents see every day.
Certain factors appeared to shape that risk. Black children were more likely to show worsening on the sleep study, echoing a broader body of research showing that sleep apnoea is more common and often more persistent in Black children. Asthma, attention problems and tobacco smoke exposure were linked with a greater chance that symptoms would persist or worsen. By contrast, larger tonsils were unexpectedly associated with lower odds of ongoing symptom burden, a result the authors said may reflect differences in where the obstruction is coming from, since tonsil size alone does not reliably predict the severity of sleep-disordered breathing.
The study also highlights the limits of using a sleep study alone to decide who should wait and who should have surgery. A model based on clinical factors did only a little better than chance at predicting objective worsening, while a model that included baseline symptom burden and tonsil grade was more informative for identifying children likely to remain symptomatic. The broader message, according to the researchers, is that watchful waiting should not mean doing nothing. For children whose snoring coexists with asthma, behavioural concerns or a heavy symptom load, repeated symptom review and a lower threshold for considering adenotonsillectomy may be warranted.
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