Oxygen consumption monitor for infants

A computer controlled, continuous oxygen consumption analyzer was designed, constructed, and tested for determining the cardiac output of infants using Fick's method. The analyzer continuously pulled air at a rate between 10 and 60 L/min from a hood placed over the infant's head and should...

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Bibliographic Details
Main Authors: Von Maltzahn, W.W., Miller, G.A.
Format: Conference Proceeding
Language:English
Subjects:
Carbon dioxide
Computerized monitoring
Data analysis
Gas detectors
Infrared sensors
Nitrogen
Oxygen
Paramagnetic materials
Pediatrics
Testing
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Summary:A computer controlled, continuous oxygen consumption analyzer was designed, constructed, and tested for determining the cardiac output of infants using Fick's method. The analyzer continuously pulled air at a rate between 10 and 60 L/min from a hood placed over the infant's head and shoulders. A sample flow of 200 mL/min was drawn from this main air flow and passed through a paramagnetic oxygen sensor and an infra-red carbon dioxide sensor. The analyzer used the data from these sensors to calculate oxygen consumption. The analyzer's performance was tested and verified by infusing a constant flow of nitrogen into the hood at different air flow rates through the hood and different nitrogen flow rates, thus simulating various levels of oxygen consumption. A simulated oxygen consumption of 100 mL/min resulted in a measured oxygen consumption of 100.73/spl plusmn/1.25 mL/min (mean and standard deviation) at various hood flow rates of 15 to 55 L/min. Finally, the analyzer was tested on several infants with cardiovascular defects.< >
DOI:10.1109/IEMBS.1994.415182