An algorithm for the early diagnosis of pulmonary arterial hypertension in systemic sclerosis. An algorithm for the early diagnosis of pulmonary arterial hypertension in systemic sclerosis. RV: right ventricle; TAPSE: tricuspid annular plane systolic excursion; PAP: pulmonary artery pressure; PA: pulmonary artery; BNP: B-type natriuretic protein; lcSSc: limited cutaneous systemic sclerosis; DL,CO: diffusing capacity of the lung for carbon monoxide; RVH: right ventricular hypertrophy; PO2: oxygen tension; TR: tricuspid regurgitation; CT: computed tomography; PE: pulmonary embolism; PF: pulmonary fibrosis; V′/Q′: ventilation/perfusion ratio; ILD: interstitial lung disease; mPAP: mean PAP; PVR: pulmonary vascular resistance; CCB: calcium channel blockers; WHO: World Health Organization; ETRA: endothelin receptor antagonist; PDE: phosphodiesterase. Reproduced from [110] with permission from the publisher. Joshua J. Solomon et al. Eur Respir Rev 2013;22:6-19 ©2013 by European Respiratory Society