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Updated: May 1, 2026

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
Published on: March 6, 2019
[Severity of the lung disease index in infants with respiratory distress syndrome]
Insights
Optimizing respiratory support for preterm infants involves analyzing lung biomechanics. Key indicators like hyperextension rate and time constant correlate with oxygenation, aiding in assessing respiratory failure severity.
Area of Science:
- Neonatal intensive care
- Pediatric respiratory medicine
- Mechanical ventilation
Context:
- Ventilator-associated lung injury and optimizing respiratory support are critical in neonatal resuscitation.
- Preterm infants often require mechanical ventilation due to respiratory failure.
Purpose:
- To enhance intensive care outcomes for preterm infants with respiratory failure.
- To optimize respiratory support by analyzing lung biomechanical characteristics and blood gas parameters.
Summary:
- This study evaluated 138 preterm infants requiring mechanical ventilation, assessing dynamic lung compliance, airway resistance, hyperextension, and time constant.
- Dynamic compliance, airway resistance, C20/C, and time constant were identified as significant biomechanical indicators of respiratory failure severity.
- A correlation was found between oxygenation index, clinical severity assessment, and mechanical ventilation duration.
Impact:
- The hyperextension rate and time constant correlate with the oxygenation index.
- These parameters can be utilized for the initial screening and evaluation of critically ill neonates admitted to the intensive care unit.
Unlabelled:
Optimization of respiratory support and prevention of ventilator-associate lung injure are the most important problems of neonatal resuscitation and intensive care.
The Aim Of The Study:
To improve the results of intensive care for respiratory failure in preterm infants by optimizing respiratory support on the basis of the analysis of the biomechanical characteristics of the lungs and blood gas.
Materials And Methods:
The study included 138 infants with birth weight 1500g (1300-1740g) and a gestational age of 30.5 (29-32) weeks in need of mechanical ventilation. Apgar score at one minute was equal to 5.0 (4.0-6.0) points, and the fifth--7.0 (6.0-7.0) points. Biomechanical properties of light investigated the dynamic lung compliance, aerodynamic upper airway resistance, the coefficient of hyperextension, the time constant and the coefficient of RVR, reflecting the patient's spontaneous breathing pattern were evaluated.
Results:
It was found that the most significant biomechanical characteristics of lungs, reflecting the severity of the respiratory failure are the dynamic compliance, aerodynamic airway resistance, coefficient C20/C, and the time constant. Correlation between the index of oxygenation, clinical assessment of the severity of respiratory failure and the duration of control mechanical ventilation was demonstrated.
Conclusion:
Rate of hyperextension and time constant are expressed by the correlation with the level of the oxygenation index, which allows them to be used for screening evaluation of severity critically ill patients during admission to the neonatal intensive care unit.
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