I have had open heart surgery (6 months ago) also  chf and afib (am age 70) been walking about mile a day with no pr oblems until about two weeks ago legs have become heavy and weak after couple blocks breathing is good I dont get it! Please help.....
These symptoms might be related to your heart failure, and some of the tablets you take for this condition might need to be adjusted. It might be possible that water tablets could be increased. Your doctor might also request a blood test called NTproBNP and a scan, to measure the stress of the heart.