<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing an irregular heartbeat, chest tightness, and palpitations. My heart rate has also decreased and Ive been gaining weight. What could be causing these symptoms?  <response>: Based on your symptoms, its possible that you have cardiomyopathy. I recommend scheduling further tests to confirm this diagnosis and discuss treatment options. 