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Thoracoabdominal Asynchrony Is Not Associated with Oxyhemoglobin Saturation in Recovering Premature Infants
Colleen Brennan1, Lara Ulm, Samuel Julian
1Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA.
Insights
Premature infants often show thoracoabdominal asynchrony (TAA), a breathing pattern disruption. This study found TAA did not correlate with oxygen levels (SpO2%) in recovering preterm infants, even with respiratory support.
Area of Science:
- Neonatal Medicine
- Respiratory Physiology
- Pediatric Pulmonology
Background:
- Premature infants face risks of hypoxemia and breathing discoordination.
- Thoracoabdominal asynchrony (TAA) reflects lung mechanics but its link to oxygenation is unclear.
Purpose of the Study:
- To investigate the relationship between oxyhemoglobin saturation (SpO2%) and TAA in preterm infants.
- To assess TAA in infants receiving high-humidity nasal cannula (HHNC) support.
Main Methods:
- Cross-sectional observational study of 92 preterm infants (mean gestational age 26.4 weeks).
- Measured SpO2% via pulse oximetry and TAA (phase angle, φ) using respiratory inductance plethysmography.
- Infants breathed room air or received HHNC with/without supplemental oxygen.
Main Results:
- Significant TAA was observed in infants on room air (φ=83.6°) and those on HHNC (φ=47.0-90.0°).
- Infants on room air had higher SpO2% (96.3%) than those on HHNC (91.3%).
- No significant association was found between TAA and SpO2% (r²=0.09).
Conclusions:
- Preterm infants exhibit TAA irrespective of ventilatory or oxygen support.
- TAA is not associated with SpO2% in this population.
- Maintaining adequate SpO2% does not necessitate correcting TAA.
Background:
Recovering premature infants are at risk for hypoxemia and lack of synchrony between their rib cage and abdomen due to airflow obstruction and poor respiratory compliance. Thoracoabdominal asynchrony (TAA) is a useful marker of resistive and elastic lung properties. Whether TAA predicts oxygenation is unknown.
Objectives:
We investigated oxyhemoglobin saturation (SpO2%) and TAA (phase angle, φ) in preterm infants with/without high-humidity nasal cannula (HHNC).
Methods:
A cross-sectional observational study was conducted in 92 infants at 32 weeks' postmenstrual age. We measured SpO2% with pulse oximetry and TAA with φ via respiratory inductance plethysmography in infants (mean gestational age: 26.4 + 1.3 weeks) who required room air (n = 18) or HHNC with/without supplemental oxygen (1-5 liters per minute, FiO2 0.21-0.33, n = 74). We calculated median SpO2% from 24.7 + 10.0 min of quiet sleep and median φ from up to 60 breaths.
Results:
Infants breathing room air alone had marked TAA (φ = 83.6 + 32.9°, range: 10.9-148.5) as did those receiving varying degrees of ventilatory and oxygen support via HHNC (range of group means, φ = 47.0-90.0°). Infants breathing room air had statically greater median SpO2% than those receiving support (96.3 + 0.6% vs. 91.3 + 0.6%; ANOVA p = 0.001). SpO2% was not associated with TAA in either group (r2 = 0.09).
Conclusion:
Recovering premature infants exhibited TAA regardless of need for ventilatory support and supplemental oxygen. TAA was not associated with SpO2% in either group. Maintenance of SpO2% does not require correction of TAA.
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