Related Experiment Videos
Postural variations in pulmonary resistance, dynamic compliance, and esophageal pressure in neonates
Insights
The right lateral posture improves lung mechanics in infants compared to the supine position. Esophageal pressure changes (delta Pes) are accurately measured in all postures, but absolute values are not clinically meaningful.
Area of Science:
- Pediatric Pulmonology
- Respiratory Physiology
- Neonatal Critical Care
Background:
- Assessing lung mechanics in infants is crucial for respiratory management.
- The esophageal balloon method is used to measure esophageal pressure changes (delta Pes).
- The influence of posture on infant lung mechanics and the reliability of delta Pes measurement require further investigation.
Purpose of the Study:
- To determine the effect of different postures on infant lung mechanics.
- To assess the clinical reliability of the esophageal balloon method for measuring delta Pes.
- To compare lung mechanics in supine, right lateral, and left lateral positions.
Main Methods:
- Lung mechanics were measured in 13 term and preterm infants.
- Measurements were taken in supine, right lateral, and left lateral postures.
- Pulmonary resistance (Rp) and dynamic compliance (Cdyn) were assessed using the occlusion test for delta Pes.
Main Results:
- Pulmonary resistance (Rp) was significantly lower in the right lateral position compared to supine.
- Dynamic compliance (Cdyn) was significantly higher in the right lateral position compared to supine.
- Delta Pes was accurately recorded in all postures; however, mean end-expiratory esophageal balloon pressure (PesEE) was higher in preterm infants and the supine posture.
Conclusions:
- The right lateral posture is mechanically less demanding for infants than the supine posture.
- The esophageal balloon method reliably measures delta Pes in infants across different postures.
- Absolute values of PesEE lack physiological meaning and should not guide patient management or lung mechanics calculations.
Abstract:
In order to determine effect of posture and to assess the reliability of the esophageal balloon method for measuring esophageal pressure changes (delta Pes) under clinical conditions, lung mechanics were measured in 13 term and preterm babies in each of 3 postures: supine, right, and left lateral. The pulmonary resistance (Rp) was significantly lower and the dynamic compliance (Cdyn) higher in the right lateral than in the supine position. Judged by the occlusion test, delta Pes was recorded accurately in each posture. The mean end-expiratory esophageal balloon pressure (PesEE) was higher in preterm infants and in the supine posture. It is concluded that the (right) lateral posture is mechanically less demanding than the supine posture and that delta Pes can be measured accurately in the supine posture. Absolute values of PesEE have no physiologic meaning and should not be used for patient management or for the calculation of lung mechanics.