Pre-term infant volume measurements by acoustic plethysmography.
An acoustic plethysmograph has been developed to provide routine total body volume measurements of pre-term (1.5-3.0 kg) infants. It operates near 50 Hz and is excited by band-limited 25 Hz span noise. Excitation, measurement, analysis, and environment are computer controlled for greater accuracy, speed, and objectivity in volume determinations. Performance tests produced volume measurements with a mean per cent error (+/- SD) of 0.77 +/- 0.66% for two phantoms with volumes of 2880 and 2130 cm3. Ten, one-minute volume measurements were obtained for 14 infants over a 20 to 30 min period. Their mean density was 1.061 +/- 0.028 g cm-3 and their weight ranged from 1294 to 2025 g.
Valerio Jiménez
O S
OS
Department of Paediatrics, Baylor College of Medicine, Houston, TX 77030.
Moon
J K
JK
Jensen
C L
CL
Vohra
F A
FA
Sheng
H P
HP
D001823:Body Composition; D002138:Calibration; D001330:Electronic Data Processing; D004867:Equipment Design; D006801:Humans; D006813:Humidity; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D010993:Plethysmography, Whole Body / Q000295:instrumentation / Q000379:methods*; D012016:Reference Values; D015203:Reproducibility of Results; D012984:Software; D013696:Temperature