Ventilation Perfusion (VQ) Scan

A ventilation/perfusion lung scan should be performed in patients with pulmonary hypertension because it has the highest sensitivity for chronic thromboembolic pulmonary hypertension (CTEPH).  A normal or low probability scan can exclude CTEPH with a sensitivity and specificity both greater than 90%.

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Figure 1.  VQ scan in normal subject 

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Figure 2.  VQ scan in CTEPH 

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Figure 3. VQ scan in IPAH

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