Sick Sinus Syndrome

Bradyarrhythmias are conditions where the heart beats too slowly, causing symptoms like dizziness, fainting, and fatigue. In some patients, these slow heart rhythms are caused by overactivity of the vagus nerve (the part of the nervous system that slows the heart down). Cardioneuroablation (CNA) is a catheter-based procedure that targets and reduces the effect of these overactive nerves on the heart. It is an alternative to permanent pacemaker implantation, especially for younger patients. Traditionally, CNA is performed using radiofrequency (RF) energy to create small burns in specific areas of the heart. This study investigates whether focal cryoablation (freezing technology using the Freezor™ Xtra catheter) is as safe and effective as standard RF ablation for CNA. This is a prospective, non-randomized study. Participants will receive either RF ablation (N=30) or cryoablation (N=30). The study will evaluate the recurrence of slow heart rhythms and fainting episodes, as well as any complications, over 12 months of follow-up.

The goal of this observational study is to evaluate the impact of different atrial pacing sites-Bachmann's bundle pacing versus right atrial appendage pacing-on the development and progression of atrial cardiomyopathy in patients diagnosed with sick sinus syndrome who are undergoing permanent pacemaker implantation.

The goal of this clinical trial is to compare two pacemaker strategies: Left Bundle Branch Area Pacing (LBBAP) and Minimized Ventricular Pacing (MVP) in patients requiring a permanent pacemaker for sick sinus syndrome and prolonged AV interval. It will also evaluate the safety and feasibility of the LBBAP method in these patients. The main questions it aims to answer is: \*Is LBBAP with physiological AV interval better than Minimized Ventricular Pacing? Researchers will compare the LBBAP group (aiming for conduction system capture with physiological AV intervals) to the MVP group (aiming to minimize ventricular pacing with prolonged AV intervals) to evaluate the optimal pacing strategy. Participants will: * Be randomly assigned to either the LBBAP group or the MVP group. * Undergo a pacemaker implantation procedure according to the specific criteria for their assigned group. * Visit the clinic for regular checkups to measure pacing function and ensure the device settings remain compliant with the study protocol.

PACE-AF is a prospective, observational patient registry designed to evaluate the impact of pacemaker algorithms on atrial fibrillation (AF) incidence, progression, and clinical outcomes in patients implanted with dual-chamber pacemakers. The registry aims to include 400-500 patients with longitudinal follow-up. Primary outcomes are progression to permanent AF and all-cause mortality. Secondary outcomes include quality of life, hospitalization, and cardiovascular events.

Objective: This clinical study employs a prospective, paired, self-controlled, non-inferiority, multicenter research design to assess the safety and efficacy of utilizing 5G cloud follow-up for CIED in parameters monitoring and remote programming post-implantation. Participants will: undergo regular clinic follow-up visits in accordance with the guidelines undergo routine in-office follow-up and 5G cloud follow-up during each regular clinic visit

This is a multicenter prospective randomized blind controlled trial with a sham procedure group of the efficacy and safety of cardioneuroablation as a method of treating symptomatic bradycardia without a permanent pacemaker implantation