Schematic diagram of the DETECT study [56]. Schematic diagram of the DETECT study [56]. Inclusion criteria: systemic sclerosis or mixed connective tissue disease for ≥3 yrs; diffusing capacity of the lung for carbon monoxide <60% predicted; and no known pulmonary hypertension (PH) or left heart disease. Study commenced October 2008; cross-sectional data analysis 2011; longitudinal phase predicted completion end 2013. RHC: right heart catheterisation; ECG: electrocardiogram; Echo: echocardiography; NT-proBNP: N-terminal pro-brain natriuretic peptide; PAH: pulmonary arterial hypertension. C.P. Denton, and E. Hachulla Eur Respir Rev 2011;20:270-276 ©2011 by European Respiratory Society