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A radiographic method for estimating lung volumes in sick infants
Author(s) -
Fumey MarieHélène,
Nickerson Bruce G.,
Birch Martha,
McCrea Ray,
Kao Lily C.
Publication year - 1992
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.1950130111
Subject(s) - medicine , functional residual capacity , lung volumes , plethysmograph , bronchopulmonary dysplasia , radiography , lung , expiration , nitrogen washout , cardiology , spirometry , tidal volume , nuclear medicine , thorax (insect anatomy) , residual volume , respiratory system , radiology , anatomy , asthma , gestational age , pregnancy , biology , genetics
Estimation of lung volumes by conventional methods in sick infants is technically difficult and is the subject of controversy. In this study, we compared both thoracic gas volume (TGV), measured with an infant whole body plethysmograph, and functional residual capacity (FRC), determined by the nitrogen washout technique, to planimetric measurements of anteroposterior chest radiographs in 26 infants with bronchopulmonary dysplasia (BPD). © 1992 Wiley‐Liss, Inc. The tidal volume (TV) of each patient was added to TGV and FRC because these were measured at the end of expiration whereas chest radiographs were taken at the end of spontaneous inspiration. The regression equations expressing the relationships between TGV and right + left lung field areas [A + B], and between FRC and lung areas are expressed as follows: [TGV + TV](mL) = 3.3 mL/cm 2 × [A + B] cm2 + 24 mL and [FRC + TV](mL) = 3.5 mL/cm2 × [A + B] cm2 − 13.5 mL. Correlation coefficients of 0.9 and 0.7 for TGV and FRC, respectively, suggest a stronger correlation between TGV and lung areas than between FRC and lung areas. Lung areas measured by planimetry correlate closely with physiological measurement of lung volumes. We conclude that the planimetric method is an inexpensive and reliable technique for estimating lung volumes in young infants with BPD when chest radiographs are available.