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Attempts at estimating mixed venous carbon dioxide tension by the single-breath method

H Ohta, O Takatani, T Matsuoka
European Respiratory Journal 1989 2: 90-95; DOI: 10.1183/09031936.93.02010090
H Ohta
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O Takatani
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T Matsuoka
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Abstract

The single-breath method was originally proposed by Kim et al. [1] for estimating the blood carbon dioxide tension and cardiac output. Its reliability has not been proven. The present study was undertaken, using dogs, to compare the mixed venous carbon dioxide tension (PVCO2) calculated by the single-breath method with the PVCO2 measured in mixed venous blood, and to evaluate the influence of variations in the exhalation duration and the volume of expired air usually discarded from computations as the deadspace. Among the exhalation durations of 15, 30 and 45 s tested, the 15 s duration was found to be too short to obtain an analyzable O2-CO2 curve, but at either 30 or 45 s, the calculated values of PVCO2 were comparable to the measured PVCO2. A significant agreement between calculated and measured PVCO2 was obtained when the expired gas with PCO2 less than 22 Torr was considered as deadspace gas.

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Attempts at estimating mixed venous carbon dioxide tension by the single-breath method
H Ohta, O Takatani, T Matsuoka
European Respiratory Journal Jan 1989, 2 (1) 90-95; DOI: 10.1183/09031936.93.02010090

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Attempts at estimating mixed venous carbon dioxide tension by the single-breath method
H Ohta, O Takatani, T Matsuoka
European Respiratory Journal Jan 1989, 2 (1) 90-95; DOI: 10.1183/09031936.93.02010090
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