Cardiomegaly following right upper lobectomy

Curious if there are people that have experienced some cardiac issues following lung lobectomy. I had a right upper lobectomy for adenocarcinoma in November of last year. My 6 month CT scan showed 4 chamber heart enlargement. My lung function has almost reached pre surgical levels, and yet I often experience shortness of breath which may have a cardiac source. Lung and cardiac function normal prior to surgery; very active....