MEASUREMENT OF TOTAL THORACIC IMPEDANCE (TI) AND SPECIFIC CONDUCTANCE (SG) IN NORMAL INFANTS BY FORCED OSCILLATION
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We studied 56 normal infants (NL) and 16 infants with broncho-pulmonary dysplasia (BPD) to determine alterations in TI and SG with growth in health and disease. TI was measured at 6 and 10
Hz by a standard forced oscillation technique. Functional residual capacity (FRC) was measured by helium dilution technique. The ages, FRCs, and lengths (L) were not different between
groups. In both groups there was a significant decrease in TI with increasing size (NL: r=-.53, p