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Physiological instability after respiratory pauses in preterm infants
Andrew P Marshall1, Kathleen Lim2, Sanoj K Ali2
1School of Engineering, College of Science Engineering and Technology, University of Tasmania, Hobart, Tasmania, Australia.
Pediatric Pulmonology
|July 18, 2019
Summary
Brief respiratory pauses, particularly when clustered, significantly increase hypoxemia and bradycardia in preterm infants. Understanding these events is crucial for improving infant respiratory support and outcomes.
Area of Science:
- Neonatal physiology
- Respiratory medicine
- Pediatric critical care
Background:
- Factors influencing apnea-related hypoxemia and bradycardia severity are not fully understood, especially in infants on noninvasive respiratory support.
- Physiological instability, including hypoxemia (SpO2 <80%) and bradycardia (HR <100 bpm), following respiratory pauses requires further investigation.
Purpose of the Study:
- To determine the frequency and predictors of physiological instability after respiratory pauses in infants receiving noninvasive respiratory support.
- To analyze the impact of respiratory pause duration and temporal clustering on hypoxemia and bradycardia.
Main Methods:
- Capsule pneumography measured respiratory pause duration in 30 preterm infants (gestation 30 weeks) on noninvasive support and oxygen.
- SpO2 and HR reductions were measured following pauses of 5-29 seconds, with clustered pauses analyzed separately.
- Regression analysis identified predictors of instability, including demographic, clinical, and situational variables.
Main Results:
- 17,105 isolated and 9,180 clustered pauses were identified.
- Longer duration and clustered pauses increased likelihood of hypoxemia and bradycardia.
- Short pauses (5-9 seconds) contributed substantially to overall physiological instability due to their frequency.
Conclusions:
- Brief respiratory pauses, especially when clustered, significantly contribute to hypoxemia and bradycardia in preterm infants.
- Identifying predictors like birth gestation, hemoglobin, respiratory support type, and caffeine treatment is key for managing instability.
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