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Site and mechanics of spontaneous, sleep-associated obstructive apnea in infants
G W Don1, T Kirjavainen, C Broome
1David Read Sleep Unit, Department of Respiratory Medicine, The Royal Alexandra Hospital for Children, Westmead, New South Wales, Australia.
Insights
Infantile obstructive sleep apnea (OSA) involves palatal or retroglossal airway obstruction. Infants with OSA show increased respiratory efforts during events, with the soft palate frequently implicated.
Area of Science:
- Pediatric Pulmonology
- Sleep Medicine
- Respiratory Physiology
Background:
- Infantile obstructive sleep apnea (OSA) is a significant clinical concern.
- Understanding the specific mechanisms of upper airway obstruction in infants is crucial for effective treatment.
Purpose of the Study:
- To investigate the mechanics of airway obstruction in infantile obstructive sleep apnea.
- To determine the primary sites of obstruction and respiratory effort patterns during obstructive events.
Main Methods:
- Airway pressures were measured using a triple-lumen catheter in 19 infants (1-36 weeks old) during overnight polysomnography.
- Magnetic resonance imaging and body weight data from 70 infants guided catheter placement.
- Obstruction sites (palatal vs. retroglossal) and respiratory effort amplitudes were analyzed.
Main Results:
- Palatal obstruction occurred in 52% of events, retroglossal in 48%.
- Palatal obstruction was significantly more common in infants treated for OSA (80%) compared to those with infrequent events (38.6%).
- Respiratory efforts increased during obstructive events (mean intrathoracic pressures reaching -20.4 cmH2O), with arousal in only 29% of apneas.
Conclusions:
- The soft palate is a common site of upper airway obstruction in infants with OSA.
- Infant responses to obstruction are distinct, showing increased respiratory efforts without persistent "upper airway resistance" and infrequent arousal compared to older children.
Abstract:
To examine the mechanics of infantile obstructive sleep apnea (OSA), airway pressures were measured using a triple-lumen catheter in 19 infants (age 1-36 wk), with concurrent overnight polysomnography. Catheter placement was guided by correlations between measurements of magnetic resonance images and body weight of 70 infants. The level of spontaneous obstruction was palatal in 52% and retroglossal in 48% of all events. Palatal obstruction predominated in infants treated for OSA (80% of events), compared with 38.6% from infants with infrequent events (P = 0.02). During obstructive events, successive respiratory efforts increased in amplitude (mean intrathoracic pressures -11.4, -15.0, and -20.4 cmH(2)O; ANOVA, P < 0.05), with arousal after only 29% of the obstructive and mixed apneas. The soft palate is commonly involved in the upper airway obstruction of infants suffering OSA. Postterm, infant responses to upper airway obstruction are intermediate between those of preterm infants and older children, with infrequent termination by arousal but no persisting "upper airway resistance" and respiratory efforts exceeding baseline during the event.