Which of the following is seen in high altitude climbers?
AHyperventilation
BPulmonary edema
CDecreased PaCO2
DAll of the options
A 56-year-old male with COPD presents with worsening shortness of breath. ABG analysis shows PaO2 of 55 mmHg. Which physiological mechanism primarily contributes to his hypoxemia?
ARight-to-left shunt
BHypoventilation
CVentilation-perfusion mismatch
DReduced inspired oxygen tension
Which of the following laboratory findings most directly indicates tissue hypoxia in a patient with chronic obstructive pulmonary disease (COPD)?
AElevated hematocrit
BElevated lactic acid levels
CIncreased erythropoietin levels
DHypercapnia
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