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Question 1 of 23

When the V/Q lung scan result returns with a mismatch ratio that is greater than 1, which condition should be suspected?

Rationale:
A mismatch ratio greater than 1 on a V/Q lung scan suggests a pulmonary embolus. This occurs because ventilation remains normal while perfusion is impaired, indicating a blockage in blood flow to lung tissue. The scan highlights areas where air reaches alveoli but blood does not, a hallmark finding for pulmonary embolism diagnosis in clinical practice. A: Pain Pain does not affect ventilation-perfusion ratios or cause mismatches on lung scans; it is a symptom, not a condition altering lung perfusion or ventilation patterns. Hence, it is unrelated to V/Q mismatch ratios. B: Atelectasis Atelectasis involves collapsed lung tissue causing both ventilation and perfusion to decrease; it typically results in matched defects, not mismatched ratios greater than 1 on V/Q scans. D: Ventricular septal defect This cardiac abnormality affects blood flow between heart chambers but does not produce localized lung ventilation-perfusion mismatches or a ratio greater than 1 on a V/Q scan.