Assessing hemodynamic response to submaximal exercise in pulmonary arterial hypertension patients using an implantable hemodynamic monitor.

Pulmonary arterial hypertension (PAH) is a chronic, progressive disease that is incurable, even with effective therapy. Long-term outcome in PAH is best preserved by targeting hemodynamic improvements to reduce risk of subsequent right ventricular (RV) failure. Methods that can assess RV adaptation to stress have important implications to better understand an individual's physiology and may play a pivotal role in guiding therapy in PAH.