<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have been having difficulty with breathing. I have had a CT scan which shows light and dark areas in my lungs. The pulmonary specialist that I started seeing put me on 30mg Prednisone for 6 weeks and now 20mg. along with oxygen use at 2L. None of this therapy has really corrected my problem. In fact, now, I need to use the oxygen most of the time. I will be seeing my doctor this week for follow up. Do you have any suggestions what diseasesproblems could be causing this. I have had history of sarcoidosis which affected my electrical system of my heart now have pacemaker for it. Looking for alternate treatments, tests etc. to be done?  <response>: Hello! Thank you for asking on Chat Doctor! I read your question carefully and understand your concern. Your past medical history is really concerning, and your symptoms seem to be related to acidosis. But I recommend performing some other tests like : pulmonary function tests, a blood gas analysis, a resting ECG, to examine better your cardiac and pulmonary function. An ambulatory 24-hour ECG monitoring may be needed if suspicions of arrhythmia are raised. Steroids can be a therapeutic test for acidosis which is a disorder which improves by steroids. But in your case, the dose of steroids may need to be raised, in order to have the wished effects. The cardiac complications, improve too, when acidosis starts responding to the therapy. You should discuss with your attending physician on the above possibilities. Hope to have been helpful! Best wishes, 