His-Bundle Corrective Pacing in Heart Failure

This study is testing whether a pacemaker technique called His-bundle pacing — which delivers electrical signals through the heart's natural conduction pathway — works better than standard cardiac resynchronization therapy (CRT) in patients with heart failure and a specific type of electrical delay in the heart (right bundle branch block, or RBBB). **You may be eligible if...** - You are 18 years or older with heart failure - You are already on optimal medical therapy for heart failure - You have been recommended for a CRT-D (a combined defibrillator and resynchronization device) based on current guidelines - You have right bundle branch block (RBBB) on your ECG and your heart's pumping function (LVEF) is significantly reduced - You have moderate to severe heart failure symptoms (NYHA Class II–IV) **You may NOT be eligible if...** - You have left bundle branch block (LBBB) or a different type of conduction delay - Your life expectancy is less than 12 months - You are unable or unwilling to follow the study protocol - You don't have a recent echocardiogram within the past year Talk to your doctor to see if this trial is right for you.