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Am. J. Respir. Crit. Care Med., Volume 165, Number 8, April 2002, 1048-1054

Altered Autonomic Function and Reduced Arousability in Apparent Life-Threatening Event Infants with Obstructive Sleep Apnea

Carmel Harrington, Turkka Kirjavainen, Arthur Teng, and Colin E. Sullivan

David Read Laboratory, University of Sydney, and Sydney Children's Hospital, Sydney, Australia; University of Helsinki, Helsinki; and University of Turku, Turku, Finland

The aim of this study was to examine cardiorespiratory control in infants presenting with an apparent life-threatening event (ALTE). We performed six to eight 45° head-up tilts in 10 ALTE infants (age, 14 ± 3 weeks) and 12 age-matched control subjects during slow wave sleep and rapid eye movement sleep (REM). All infants underwent full overnight polygraphic sleep recordings with noninvasive measurement of beat-to-beat blood pressure. All control infants had normal sleep breathing. In contrast, 5 of the 10 ALTE infants had more than two obstructive apneas per hour of sleep, with short hypoxic episodes (obstructive sleep apnea [OSA]). In slow wave sleep, in response to the tilt, the ALTE infants with OSA showed a reduced heart rate response, and three of the five showed a marked postural hypotension. The ALTE infants with OSA also had altered heart rate and blood pressure variability and an increased arousal threshold in REM (p = 0.0002). By contrast, those ALTE infants with normal sleep breathing had cardiovascular and arousal responses similar to those of the control infants. We conclude that a number of ALTE infants with OSA have abnormal cardiovascular autonomic control that, combined with their decreased arousability in REM, may provide an explanation for the ALTE episodes.




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