my father has hypertension for the last several years. he has been taking telma 40, ecosprin, and supermet excel. of late, he has breathlessness when he walks. according to 2d echo he has LV diastolic dysfunction. we met a cardiologist. he says there may be fluid collection in the lungs and prescribed lasix 40 for three days and lasix 20 for four days. today he has stopped supermet excel and increased telma to 80. he wants us to get a lung hrct. 8 years ago my father underwent coronary angiogram which was normal. is this short of breath due to heart disease or lung disease.