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Neck and body position effects on pulmonary mechanics in infants
W A Carlo1, A Beoglos, B S Siner
1Department of Pediatrics, Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, Ohio 44106.
Insights
Infant posture significantly impacts pulmonary function. Optimizing body and neck positioning can improve breathing in infants, especially those with a history of assisted ventilation.
Area of Science:
- Pediatric Pulmonology
- Neonatal Medicine
- Respiratory Physiology
Background:
- Former preterm infants often experience altered pulmonary mechanics.
- Assisted ventilation in the neonatal period can affect long-term respiratory health.
- Bronchopulmonary dysplasia is a common complication in preterm infants requiring ventilation.
Purpose of the Study:
- To investigate the effect of body and neck positioning on pulmonary mechanics in former preterm infants.
- To determine if infants with a history of bronchopulmonary dysplasia respond differently to postural changes.
- To provide evidence for optimizing positioning during infant pulmonary function testing.
Main Methods:
- Pulmonary mechanics and ventilatory parameters were measured in 30 former preterm infants (8-10 months corrected age).
- Infants were studied in supine and semisitting positions with neutral, flexed, and extended neck positions.
- Comparison between infants with and without a history of bronchopulmonary dysplasia was performed.
Main Results:
- Changing from supine to semisitting position decreased total pulmonary resistance (P < .05) and increased specific lung compliance (P < .01).
- Neck flexion increased pulmonary resistance (P < .001) but did not affect lung compliance.
- No significant differences in postural effects were observed between infants with and without bronchopulmonary dysplasia.
Conclusions:
- Infant posture critically influences pulmonary function measurements.
- Semisitting position may improve lung function by increasing functional residual capacity.
- Neck flexion can increase airway resistance, likely due to pharyngeal area changes.
- Precise control of body and neck position is essential for accurate pulmonary function testing in infants.
Abstract:
Pulmonary mechanics and ventilatory parameters were measured in 30 former preterm infants at a postterm age of 8 to 10 months. All subjects had required assisted ventilation in the neonatal period and 16 had a history of bronchopulmonary dysplasia. Each infant was studied in both supine and semisitting positions, and in each body position the infants were studied with neutral, flexed, and extended neck positions. Baseline measurements (body supine, neck neutral) and the response to postural changes did not differ between infants who had had bronchopulmonary dysplasia and those who had not. Change in body position from supine to semisitting decreased total pulmonary resistance (P less than .05) and increased specific lung compliance (P less than .01). Neck flexion increased resistance (P less than .001) in both body positions but did not influence compliance. These postural effects are consistent with an increase in functional residual capacity in the semisitting position and a decrease in pharyngeal area during neck flexion. Thus, posture needs to be precisely controlled during pulmonary function testing in infants. Furthermore, optimal neck and body position may improve their clinical status.