MEASUREMENT OF TOTAL THORACIC IMPEDANCE (TI) AND SPECIFIC CONDUCTANCE (SG) IN NORMAL INFANTS BY FORCED OSCILLATION

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