Figure 2From: Chronic obstructive pulmonary disease phenotype desaturator with hypoxic vascular remodelling and pulmonary hypertension obtained by cluster analysisCorrelation obtained by cluster analysis, between mean pulmonary arterial pressures made by echocardiography versus diurnal PaCO 2 and nocturnal T90 values. (D) Desaturator patients may be identified, by cluster analysis, by a pattern of Mean PAP and, rather than by T90 alone, with the latter two variables being predictors of nocturnal desaturation severity. From [35].Back to article page