Right Ventricular Functional Reserve in Early-Stage Idiopathic Pulmonary Fibrosis An Exercise Two-Dimensional Speckle Tracking Doppler Echocardiography Study

BACKGROUND: The most important determinant of long-term survival in patients with idiopathic pulmonary fibrosis is the right ventricular (RV) adaptation to the increased pulmonary vascular resistance. Our aim was to explore RV contractile reserve during stress echocardiography in early-stage IPF.