At the altitude of 6500 meters, the atmospheric pressure is 347 Hg. What is the inspired PO2?
PO2 of the inspired air is 21 percent of ihe total barometric (atmospheric) pressure. Hence, (21/100) 347 = 72.87. Decreased ambient oxygen pressure results in hypoxemia. This is most commonly seen at high altitude or in nonobstructive asphyxia. The A-a O2 gradient is normal, and hypoxemia improves with supplemental oxygen. Ref: Sarko J., Stapczynski J.S. (2011). Chapter 65. Respiratory Distress. In J.E. Tintinalli, J.S. Stapczynski, D.M. Cline, O.J. Ma, R.K. Cydulka, G.D. Meckler (Eds), Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 7e.
73 mmHg
63 mmHg
53 mmHg
83 mmHg