COPD: chronic obstructive pulmonary disease; CTEPH: chronic thromboembolic pulmonary hypertension; DPG: diastolic pressure gradient; LHD: left heart disease; LV: left ventricular; PE: pulmonary embolism; PH: pulmonary hypertension; PVR: pulmonary vascular resistance. ^aClass of recommendation. ^bLevel of evidence. ^cReference(s) supporting recommendations.