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Effect of chestwall distortion on the measurement of pulmonary mechanics in preterm infants
Author(s) -
Neto Galdino Silva,
Gerhardt Tilo,
Claure Nelson,
Duara Shahnaz,
Bancalari Eduardo
Publication year - 1995
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.1950200107
Subject(s) - medicine , distortion (music) , cardiology , anesthesia , physics , amplifier , optoelectronics , cmos
The purpose of this study was to determine the effect of chestwall distortion (CWD) on the measurement of pulmonary compliance (C L ) and resistance (R L ). Inductance plethysmography was used in 15 preterm infants to determine CWD as total compartmental displacement ratio (TCDR) and out of phase movement between ribcage and abdomen as phase shift (PS). Flow was measured by pneumotachography and esophageal pressure change (Pe) with a water‐filled catheter. C L and R L were calculated by linear regression analysis. Seven infants (mean ± SD: BW, 1,484 ± 186 g, GA 32.4 ± 2.2 weeks, age 8.7 ± 4.7 days) had a breathing pattern characterized by episodes with a high degree of CWD, followed by periods with minimal CWD (distortion group). In this group lung function measurements were analyzed separately during periods with and without CWD. The remaining 8 infants (BW, 1,244 ± 233 g, GA 30.4 ± 2.4 weeks, age 7.4 ± 3.1 days) always breathed with minimal CWD, and the measurements in this group (non‐distortion group) were used as a reference for the values obtained in the distortion group. Measurements of TCDR, PS, C L , R L , and tidal volume (V T ) obtained in the absence of CWD were not significantly different between distortion and non‐distortion groups. The measurements obtained in the presence of CWD showed a significantly higher TCDR and PS, but C L and R L were not significantly different from the C L and R L measurements obtained in the distortion and non‐distortion groups in the absence of CWD. The only signficant effect of CWD was a reduction in V T . The results indicate that the moderate degree of CWD observed in the study population does not significantly contribute to the variability in C L and R L measurements in preterm infants. Pediatr Pulmonol. 1995; 20:34–39 . © 1995 Wiley‐Liss, Inc.