Thank You @johnbishop @rosemarya for links and information to research. I have read a good amount of what is out there. I was hoping to hear from any other transplant recipients who may have experienced it, but looks as though this is as uncommon of a condition as it says it is. @colleenyoung, he will need what is called a surgical plication that lifts the diaphragm. He undergoes more pulmonary testing next week, we will make a decision to proceed after those results. Again, thank you for your responses and best wishes.