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Sun et al reported (1982) that ETCO2 correlates extremely well with arterial CO2 (PaCO2) in newborn infants with normal lungs and emphasized the advantage of continuously and non-invasively
following pulmonary function using ETCO2 and AaDCO2 of RDS infants from day one on respirator until the last day on ventilator. Foregger End-Tidal CO2 monitoring system was used in this
study. End tidal gas was collected via ET tube adaptor at the sampling flow rate of 150 ml/min. Thirty-six RDS infants, (m GA 31.9 wks m BW 1618 gms, age 1 to 8 days) who required FiO2 >40%
were studied daily for 8 days or until they were extubated.
PETCO2 and AaDCO2 showed inverse relationship. While PETCO2 increased stepwise AaDCO2 decreased daily as patients showed clinical and blood gas improvement. The correlation coeficient of
PETCO2 trend was r=0.963, p
