I am currently in Pulmonary Rehab which I think is helping. The orginal testing in Oct '08 for the phrenic nerve was not able to find anything. Since no one has found a cause it is labeled idiopathic-NO KNOWN CAUSE. I went from fairly active one day to emergency room and breathing problem the next. What the difference a day makes. There seems to be no known cure but, possibe idiopathic cure. . I am located in the Washington D.C. metro area where there are doctors who are also learning as I go thru this process. Neurogolist at George Washington are using IVIG treating this as CIDP (Chronic Infammatory Demylenation Polyneuropathy) --eyesight seems to be getting better --not sure of breathing.