AlEX-DHF: Ablation and Exercise in Diastolic Heart Failure

This study is testing whether catheter ablation (a procedure that uses heat or cold to correct abnormal heart rhythms) combined with a supervised exercise program works better than either treatment alone for people with heart failure with preserved pumping function (HFpEF) who also have atrial fibrillation (an irregular heartbeat). **You may be eligible if...** - You have been diagnosed with heart failure with preserved ejection fraction (HFpEF) - You have symptomatic atrial fibrillation that was diagnosed within the past year and has been short-lasting (persistent, not permanent) - You are physically and mentally able to perform exercise testing **You may NOT be eligible if...** - Your atrial fibrillation is paroxysmal, long-standing, or permanent - You have unstable heart disease or a recent heart attack - You have had a prior ablation procedure - Your heart pumping function (ejection fraction) is below 50% - You have significant valve disease or pulmonary hypertension Talk to your doctor to see if this trial is right for you.