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Diagnostic algorithm for chronic thromboembolic pulmonary hypertension. PH: pulmonary hypertension; CTEPH: chronic thromboembolic pulmonary hypertension; TR: tricuspid regurgitation; WHO: World Health Organization; V/Q: ventilation/perfusion; PAP: pulmonary artery pressure; PCWP: pulmonary capillary wedge pressure; PVR: pulmonary vascular resistance; CTPA: computed tomography pulmonary angiogram.
