FIGURE 2.

Algorithm for the diagnosis of pulmonary hypertension (PH) and its causes: role of the PH expert centre. CTEPH: chronic thromboembolic PH; V/Q: ventilation/perfusion; RHC: right heart catheterisation. ^#: single photon emission computed tomography or planar V/Q scan is acceptable; ^¶: these include patients with chronic thromboembolic disease without PH; ⁺: the composition of the multidisciplinary team may differ depending on the type of clinical problem; ^§: according to clinical classification of PH; ^ƒ: only in expert centres and only with a reassessment plan in place.