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Observations made on severe apneic spells in two infants at risk for sudden death
Insights
This study investigated infant apnea, finding mixed apnea involving pharyngeal obstruction is clinically significant. Theophylline showed potential in reducing apnea incidence in at-risk infants.
Area of Science:
- Pediatric Pulmonology
- Neonatal Sleep Studies
Background:
- Infants at risk for sudden infant death syndrome (SIDS) were studied for prolonged apneic spells.
- Quantification of airflow and pharyngeal airway pressures were utilized.
Observation:
- Severe apneic spells were associated with a spectrum of shorter apneas.
- Physiologic events like sighs and swallows occurred alongside apneic spells.
- Infant A exhibited clustering of severe apneic spells.
Findings:
- Mixed apnea was identified as the clinically significant form.
- Pharyngeal obstruction was the primary site of obstruction in mixed apnea.
- Obstruction onset was often at the beginning of spells, progressing over breaths.
- Obstruction resolved gradually following the apneic spell.
Implications:
- Understanding the mechanics of mixed apnea can inform clinical management.
- Theophylline may be a therapeutic option for reducing apnea in vulnerable infants.
- Further research into pharyngeal airway dynamics during apnea is warranted.
Abstract:
We have studied the sequence of events during prolonged apneic spells in two infants who, by virtue of multiple risk factors or ultimate death, were at risk for sudden death. Using techniques to quantitate airflow and pharyngeal airway pressures, we have reported many descriptive aspects of the apnea in these infants. Specifically, we have noted that severe apneic spells in these infants were accompanied by a wide spectrum of lengths and types of shorter apneas. In the case of infant A, the most severe spells occurred in clusters. Physiologic phenomena usually considered normal (sighs, swallows, etc.) often occurred in association with the apneic spells. In addition, we found that: 1) mixed apnea was the clinically significant form of apnea; 2) in mixed apnea, the site of obstruction was in the pharynx; 3) obstruction often occurred at the beginning of the spells; and 4) this obstruction occurred progressively over a series of breaths prior to the spell and resolved in a similar fashion. Theophylline, in one infant, decreased the incidence of apnea.