Prospective Cohort Study of Bachmann Bundle Versus Right Atrial Appendage Pacing: Impact on Atrial Cardiomyopathy Evaluated by Echocardiographic Parameters and Clinical Outcome

Inclusion Criteria: * Patients aged 19 years or older * Patients diagnosed with sick sinus syndrome who are scheduled for de novo implantation of a permanent pacemaker or permanent implantable cardioverter-defibrillator * Patients or their legal representatives who voluntarily consent to the access of medical records and study data throughout the entire research period Exclusion Criteria: * Patients with persistent or permanent AF * Patients with a life expectancy of less than one year due to other comorbidities * Pregnant or breastfeeding women * Patients who refuse active treatment