[Alveolar hypoventilation during sleep in pharyngeal obstruction caused by lymphoid hypertrophy in children].

Twenty-four children suspected of having apnea induced by lymphoid pharyngeal obstruction were studied by nocturnal polygraphy. The data recorded were: instantaneous cardiac frequency, thoracic movements, naso-oral flux, transcutaneous PO2 and PCO2. Episodes of hypoxemia and of hypercapnia related to obstructive apneas were found in 19 children; the mean of the lowest values of PtcO2 during sleep was 58.4 mmHg versus 85 mmHg during wakefulness. The mean od the highest values of PtcCO2 was 50 mmHg during sleep versus 40 mmHg during wakefulness. Six children presented with marked hypoxemia (PtcO2 less than or equal to 50 mmHg). Transcutaneous blood gas monitoring is indicated in all children presenting with sleep disorders due to pharyngeal obstruction. The finding of a marked hypoxemia should suggest removal of the obstacle concerned.