Low diffusion and saturation suggested COPD, but her lung function was 115% of normal (so very mild) Put on Advair
and Spyriva...1 month later, diffusion dropped! But lungs were always clear, functioning at over 100%. Sent for every test you can imagine - from CT angiogram, etc. to CT chest - no shunts, no embolisms, fibrosis,etc. Oxygen level at night 98% (no not apnea). After two ecocardiograms and a 5 bubble echos-no hole in heart.