Article Text


A controlled study of sleep related disordered breathing in obese children


Background: Unlike the adult sleep related disordered breathing (SDB) patients who are typically obese, the relation between obesity and childhood SDB is not clear.

Aims: To investigate whether obese children are more at risk of obstructive SDB when compared to normal population, and whether this risk is potentiated by the presence of pharyngeal lymphoid tissue.

Methods: Forty six obese children (age 10.8 (SD 2.3) years; BMI 27.4 (SD 5.1)), and 44 sex and age matched normal weight children (age 11.7 (SD 2.1) years; BMI 18 (SD 1.8)) were studied. All children underwent a set of physical examinations (including the upper airways) and sleep studies.

Results: The obese children were different from the normal weight children in terms of type (predominantly obstructive), frequency, and severity of respiratory disturbances. Depending on the criteria used, 26% or 32.6% of obese children had SDB; 2.3% of normal controls had OAI ⩾1 and 4.5% had RDI ⩾5. Presence of SDB was related to presence of tonsils (size >2; range 0–4) (OR 12.67, 95% CI 2.14 to 75.17) and BMI (OR 1.20, 95% CI 1.08 to 1.33).

Conclusions: Results suggest that obese children are at increased risk of obstructive SDB; the presence of any pharyngeal lymphoid tissue enlargement in obese children should therefore be aggressively managed.

  • childhood
  • sleep related disordered breathing
  • obesity
  • pharyngeal lymphoid tissues
  • AI, apnoea index
  • BMI, body mass index
  • CA, central apnoea
  • ECG, electrocardiogram
  • EEG, electroencephalogram
  • EMG, electromyogram
  • EOG, electro-oculogram
  • ETCO2, end tidal CO2
  • IBW, ideal weight for height
  • MSLT, multiple sleep latency test
  • OA, obstructive apnoea
  • OAI, obstructive apnoea index
  • ODI, oxygen desaturation index
  • PSG, polysomnographic studies
  • RDI, respiratory disturbance index
  • SDB, sleep disordered breathing

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