RIGHT VENTRICULAR FUNCTIONAL RESERVE IN EARLY STAGE IDIOPATHIC PULMONARY FIBROSIS: AN EXERCISE TWO DIMENSIONAL SPECKLE TRACKING DOPPLER ECHOCARDIOGRAPHY STUDY On Behalf of The RIGHT Heart International NETwork (RIGHT-NET) Investigators.

RV myocardial dysfunction is already present at rest in early stage IPF and worsens during exertion as detected by 2DSTE. The RV altered contractile reserve appears to be related to reduced exercise tolerability and impaired pulmonary hemodynamic.