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- W2000659721 abstract "Using only skin surface blood gas measurements, we calculated the ventilatory response to inhaled carbon dioxide from changes in skin surface PCO2 (PSCO2). This new method is based on the fact that if CO2 elimination is nearly constant, the change in alveolar ventilation from one steady state level to another is inversely proportional to the change in PSCO2. From this we derived a ventilatory ratio (VR) for 0%, 2%, and 4% CO2 breathing. A ventilatory response slope is then calculated from the three VR values, and is similar to a standard CO2 response slope. We serially studied 20 infants (28 to 40 weeks gestation) 2 to 9 weeks of age. Ten infants had serious apnea, ten did not. The infants breathed each test gas for 8 to 10 minutes during quiet sleep with skin surface electrodes attached. Infants with apnea were studied before and after apneic spells resolved. We found that apneic infants had a significantly reduced VR slope compared with that in the nonapneic infants, regardless of age. When apnea disappeared, the ventilatory ratio slope always increased into the range measured in nonapneic infants. In nonapneic infants the ventilatory ratio slope significantly increased with postnatal age. We conclude that infants with serious apnea have a reduced ventilatory response to CO2 and that the resolution of apnea is associated with the development of a normal CO2 response." @default.
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- W2000659721 date "1984-09-01" @default.
- W2000659721 modified "2023-10-17" @default.
- W2000659721 title "Estimation of ventilatory response to carbon dioxide in newborn infants using skin surface blood gas electrodes" @default.
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- W2000659721 doi "https://doi.org/10.1016/s0022-3476(84)80010-4" @default.
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