The patient’s ABG demonstrates isolated hypercarbia and a respiratory acidosis with a pH of 7.26, pCO2 of 58, and a Bicarb of 24.9. His oxygenation is fine. The transmembrane pressures and arterial side oxygenation is fine, so this is not a problem with circuit gas exchange. The CXR is not consistent with pulmonary edema so the native lung diffusion and gas exchange should be normal as well.

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