A patient has coronary artery bypass graft surgery and is transported to the surgical intensive care unit at noon.He is placed on mechanical ventilation.Interpret his initial arterial blood gas levels:
pH 7.31
PaCO₂ 48 mm Hg
Bicarbonate 22 mEq/L
PaO₂ 115 mm Hg
O₂ saturation 99%

Question

Quizplus · Accepted Answer

The high PaO₂ level reflects hyperoxygenation; the PaCO₂ and pH levels show respiratory acidosis.The respiratory acidosis is uncompensated as indicated by a pH of 7.31 (acidosis)and a normal bicarbonate level.No metabolic compensation has occurred.

A Patient Has Coronary Artery Bypass Graft Surgery and Is