Which condition is primarily responsible for the decrease in arterial PO2 in patients with chronic obstructive pulmonary disease (COPD)?
ACO poisoning
BShock
CCyanide poisoning
DVentilation-perfusion mismatch
A patient with acute pulmonary embolism is found to have hypoxia. What is the most likely mechanism causing hypoxia in this condition?
AHypoventilation
BDiffusion impairment
CVentilation-perfusion mismatch
DShunt
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
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