Respiratory Quiz #13, Ventilation and Perfusion Mismatch  

1. A 72-year-old man with a history of chronic obstructive pulmonary disease (COPD) presents to the emergency department with increased shortness of breath. His arterial blood gas shows hypoxemia with a normal arterial carbon dioxide level. Which of the following best explains the mechanism of hypoxemia in this patient? 

Question 1 of 6

2. A 25-year-old woman is admitted to the hospital with a pulmonary embolism. She is started on anticoagulation therapy. Which of the following best describes the expected change in ventilation and perfusion in the affected area of the lung immediately following the embolic event? 

Question 2 of 6

3. A patient with acute respiratory distress syndrome (ARDS) is being managed in the ICU. Despite high concentrations of inspired oxygen, the patient remains hypoxemic. Which of the following mechanisms is primarily responsible for the patient's refractory hypoxemia? 

Question 3 of 6

4. A patient with a history of smoking and chronic bronchitis is evaluated for dyspnea. Pulmonary function tests reveal a decreased FEV1/FVC ratio and increased residual volume. Which of the following is the most likely cause of hypoxemia in this patient? 

Question 4 of 6

5. A 55-year-old man with pulmonary fibrosis is on oxygen therapy. Despite this, he continues to exhibit signs of hypoxemia. Which of the following mechanisms is most likely contributing to his persistent hypoxemia? 

Question 5 of 6


Question 6 of 6


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