Control Of Breathing And Regulation Practice Test

A 28-year-old woman participates in a trek to a base camp located at an altitude of 5,000 meters (16,400 feet). During the first 24 hours, she experiences shortness of breath, headache, and fatigue. Her breathing is rapid and deep. An arterial blood gas analysis at this time would most likely show which of the following findings?

A mountaineer has been at an altitude of 4,000 meters for four days. Initially, her arterial blood pH was 7.50 due to hyperventilation. A repeat arterial blood gas analysis now shows a pH of 7.42, a PaO2 of 55 mm Hg, and a PaCO2 of 28 mm Hg.