Respiratory Medicine MCQ for NEET PG & FMGE

← Respiratory Medicine

A 68-year-old male with a 10-year history of chronic obstructive pulmonary disease (COPD) presents with worsening cough and dyspnea for 3 days following a cold. Arterial blood gas (ABG) analysis (without oxygen supplementation): pH 7.38, PaCO₂ 6 kPa (45 mmHg), PaO₂ 9.4 kPa (70 mmHg). The most likely cause of his hypoxemia is due to:

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