Hypoxemia during hyperbaric oxygen therapy.

This report describes a patient with mucormycosis treated with hyperbaric oxygen therapy (HBO2). Arterial O2 tension (PaO2) during HBO2 was considerably lower (346 mm Hg) than expected (1,500 mm Hg) due to an inadvertent right main-stem intubation, which was not otherwise clinically evident. This case illustrates the influence of a large right-to-left shunt (Qs/Qt) on O2 loading during HBO2. We raise the question if routine hyperbaric treatment protocols are adequate to raise PaO2 in patients with large Qs/Qts.