EVALUATION OF IMPEDANCE CARDIAC OUTPUT IN CHILDREN

Autor:	Robert E. Durnin, Paul E. Leaverton, D. A. Ehmke, Zuhdi Lababidi, Ronald M. Lauer
Rok vydání:	1971
Předmět:	medicine.medical_specialty Cardiac output business.industry Dye dilution computer.file_format Mean difference Valvular insufficiency Internal medicine Pediatrics Perinatology and Child Health medicine Cardiology ICO Pulmonary blood flow Impedance cardiograph business computer Electrical impedance
Zdroj:	Pediatrics. 47:870-879
ISSN:	1098-4275 0031-4005
DOI:	10.1542/peds.47.5.870
Popis:	In 20 children without shunts or valvular insufficiency, duplicate dye dilution and impedance cardiac outputs (ICO) were carried out. The duplicate dye dilutions had a standard deviation 0.259 L/min/m2, while duplicate ICO had a standard deviation 0.192 L/min/m2 (F = 1.82, p < 0.05). Of 53 sequential estimates, cardiac outputs measured by both indicator dye dilution and ICO had a 5.5% mean difference. In 21 subjects with left to right shunts, the ICO related well with pulmonary blood flow (r = 0.92) rather than systemic flow (r = 0.21). In 13 subjects with aortic insufficiency, sequential Fick and ICO had a 50% mean difference; the impedance measurement was found to be higher in every case. These data indicate that the impedance cardiograph can provide a noninvasive measure of cardiac output when there are no shunts or valvular insufficiencies. In subjects with left to right shunts the impedance cardiograph provides a measure of the pulmonary blood flow. When aortic insufficiency exists the impedance cardiograph is distorted such that it is consistently higher than Fick cardiac output.
Databáze:	OpenAIRE
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