In order to assess the events occurring at the tissue level, especially tissue oxygenation, what pa-rameter would you sample and measure?

a. Coronary sinus blood
b. Left-sided heart blood
c. Systemic arterial blood
d. Systemic mixed venous blood


ANS: D
To assess tissue gas exchange, the respiratory therapist must consider mixed venous blood pa-rameters. The use of mixed venous blood to assess tissue oxygenation also is discussed in Chap-ter 43.

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