Measurement of total thoracic impedance (ti) and specific conductance (sg) in normal infants by forced oscillation

ABSTRACT 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<.001; BPD: r=.54, p<.02). The mean TI values were significantly higher for the

BPD group: TI at 10Hz was significantly lower in both groups than TI at 6Hz (p<.001). SG also decreased with growth despite the decrease in TI (NL: r=-.50, p<.001; BPD: r=-.38,

p<.10). There was no difference in SG between groups. We conclude that TI is easily measured in infants by forced oscillation and demonstrates the expected decrease with growth and a

frequency dependence. Finally, SG decreases with growth suggesting a relative dysanapsis in lung growth with lung volume increasing more rapidly than airway size. ARTICLE PDF AUTHOR

INFORMATION AUTHORS AND AFFILIATIONS * Dept. Red. and Div. Resp. Sci., Arizona Health Sciences Center, Tucson, AZ Wayne J Morgan, Robert Tepper, Kathy Cota & Lynn M Taussig Authors *

Wayne J Morgan View author publications You can also search for this author inPubMed Google Scholar * Robert Tepper View author publications You can also search for this author inPubMed 

Google Scholar * Kathy Cota View author publications You can also search for this author inPubMed Google Scholar * Lynn M Taussig View author publications You can also search for this author

inPubMed Google Scholar CONSORTIA GHMA PEDIATRICIANS RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Morgan, W., Tepper, R., Cota, K. _et al._

MEASUREMENT OF TOTAL THORACIC IMPEDANCE (TI) AND SPECIFIC CONDUCTANCE (SG) IN NORMAL INFANTS BY FORCED OSCILLATION. _Pediatr Res_ 18 (Suppl 4), 398 (1984).

https://doi.org/10.1203/00006450-198404001-01833 Download citation * Issue Date: 01 April 1984 * DOI: https://doi.org/10.1203/00006450-198404001-01833 SHARE THIS ARTICLE Anyone you share the

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