hello, Thanks for the consult.. Brief answer, You have to continue with digoxin 0.25mg tablet for 5 days a week for congestive heart failure Detailed Explanation, 1. I read your query i am happy to help you. You already mentioned that your blood pressure readings are low. 2. This suggests that you have Congestive heart failure with mitral valve prolapse commonly called as Left Heart Failure. 3. This problem is common to your age i mean more than 75 years of age 4. For congestive heart failure use Digoxin 0.25mg for 5 days in a week For atrial fibrillation you have to use Amiodorone tablets 5. At this age surgery is contraindicated due to low blood pressure Hope this information helps...