Physiological Ventricular Pacing Vs Managed Ventricular Pacing for Persistent AF Prevention in Prolonged AV Interval

Inclusion Criteria: 18 years older patients, able to express Informed Consent, with prolonged atrioventricular interval (PR\>180 ms) and one of the following indications for PM implantation according to current guidelines: * Sinus node disease. * Paroxysmal type1or 2 second-degree AV-block. Exclusion Criteria: * Candidacy for implantable cardioverter-defibrillator or cardiac resynchronization therapy device implantation. * Severe grade mitral or aortic regurgitation/stenosis. * Atrial fibrillation ablation (left pulmonary veins). * Cardiac surgery \< 3 months before PM implantation. * History of long-standing persistent AF. * Permanent third-degree AV block. * Participation in another clinical trial in the past 3 months. * Pregnancy or intention to become pregnant. * Life expectancy of \< 3 years.