A review of imaging modalities in pulmonary hypertension
V/Q scan is the imaging modality of choice for screening patients with suspected chronich tromboembolic pulmonary hypertension (CTEPH) due to its high sensitivity. Imaging in CTEPH reveals perfusion defects with normal ventilation. A normal or low-probability V/Q effectively excludes CTEPH with a sensitivity of 90-100% compared to CTPA yielding a sensitivity of 50-98%. Despite the high sensitivity and experts recommendations, V/Q scan for detecting CTEPH patients is still underutilized. Efforts should be tailored to increase its use in clinical setup as V/Q do not require iodine contrast and have less radiation exposure compared to CTPA.
Ann Thorac Med 2017; 12(2): 61-73