Does anyone have experience of exercise induced right sided abdominal pain (not due to right heart failure - normal VP, IVC on echo) in severe MR due to MVP or other valvar disease. And now post op appears to have same syndrome with severe PHT. Is the PHT related to mesenteric ischaemia, causing the pain, and releasing vasoactive agents causing the PHT? All abdominal investigations negative (invasive mesenteric angio not yet done).