Figure 2From: Capillary pCO2 helps distinguishing idiopathic pulmonary arterial hypertension from pulmonary hypertension due to heart failure with preserved ejection fraction Receiver operated characteristics (ROC) curve showing the diagnostic performance of p c CO 2 in distinguishing idiopathic pulmonary arterial hypertension (IPAH) from pulmonary hypertension in patients with heart failure and preserved ejection fraction (PH-HFpEF). Back to article page