Abstract
Overhead radiant warming devices facilitate the care of sick newborn infants. However, no data are available on the energy ex penditure)oxygen consumption)of infants under radiant energy warmers compared to conventional incubators. This study was conducted to compare oxygen consumption of normal, two day old full term infants subjected to non-ionizing radiant warmers(KDC-CC-660) and to conventional incubators(Servo-Care Armstrong Incubators, Ohio Medical Products). Oxygen consumption was determined using the “closed system technique” employing nasal prongs, a CO2 analyzer the Beckman OM-11 O2 analyzer and the Hewlett Packard (HP). Pneumotach with attachments to the respiratory integrator of the HP 7700 multichannel recording system. All infants were fed 20 minutes prior to each recording period. Each infant was alternately placed on the radiant warmer and the incubator(servo-control set to 36.5 ° C)and after an initial stabilizing period of 20-30 minutes the O2 consumption was determined for 3-5 minutes while in quiet sleep (characteristic EEG, ECG, muscle activity and respiration). The skin temp and heart rate were respectively, radiant warmer 36.6 ° C and 136 b/m and incubator 36.1 ° C and 135 b/m. These findings support the hypothesis of increased oxygen consumption in infants on radiant energy warmers.
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