Feasibility and Prognosis of Left Atrial Appendage Closure in Patients With Heart Failure and Atrial Fibrillation

Study hypotheses is that in patients with heart failure and atrial fibrillation, reduced left atrial appendage (LAA) emptying velocities leads to LAA thrombus formation therefore a higher rate of stroke and embolism are observed even on oral anticoagulants. Therefore The left atrial appendage closure (LAAC) procedure's benefit in patients with an impaired left ventricular ejection fraction (LVEF) has to be investigated So the study is to assess the safety and prognosis of left atrial appendage closure (LAAC) in patients with heart failure in preventing thromboembolic events, bleeding and all-cause mortality. Patients will be divided into to groups, one group includes patients with no evidence of heart failure, and another group including patients with previous history of or with an evidence of with heart failure.