A 36-year-old man with a history of AIDS and Pneumocystis infection presents to the emergency department with severe respiratory distress. The patient is placed on a ventilator at a rate of 16, tidal volume of 600mL, and FIO2 of 0. An arterial blood sample taken 20 minutes later reveals a PO2 of 350 mmHg, a PCO2 of 36 mmHg and a pH of 7.32. At a barometric pressure of 757 mmHg and assuming normal respiratory exchange ratio (R) of 0.8, the patient’s alveolar oxygen tension is approximately which of the following in mmHg 576 355 665 105 712

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A 36-year-old man with a history of AIDS and Pneumocystis infection presents to the emergency department with severe respiratory distress. The patient is placed on a ventilator at a rate of 16, tidal volume of 600mL, and FIO2 of 0. An arterial blood sample taken 20 minutes later reveals a PO2 of 350 mmHg, a PCO2 of 36 mmHg and a pH of 7.32. At a barometric pressure of 757 mmHg and assuming normal respiratory exchange ratio (R) of 0.8, the patient’s alveolar oxygen tension is approximately which of the following in mmHg

576

355

665

105

712

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