COPD, interstitial
lung disease, etc. have been ruled out through
CT scans, Xrays and a triple
lung wedge biopsy. Right heart catherization was normal with a pulmonary artery pressure of 25/10. Echocardiograms showed normal heart function, with 62% ejection fraction. A small shunt estimated at 5.15% was seen on a nuclear medicine study. However, even though bubble saline echocardiogram showed small shunt at rest, that shunt did not increase with exertion.