Progressive familial heart block, type 1A

This trial tests two ways of placing a pacemaker lead in the heart's left bundle branch area. One strategy aims to directly capture the heart's conduction system, while the other accepts capture of the nearby septal muscle. Researchers will compare how well the heart's pumping fu…

This study tests a newer, more natural pacing method for people with heart failure and electrical problems in the heart. The approach uses the heart's own conduction system to improve coordination between chambers. Researchers will track patients for two years to see if this meth…

This study explores whether the electrical signal measured by a pacemaker or defibrillator during implantation can help identify cardiac amyloidosis — a condition where abnormal proteins build up in the heart. Researchers will enroll 242 adults aged 65 and older who already need …

This study follows 25,000 people referred to a specialized heart clinic with symptoms like chest pain or shortness of breath. Researchers will track which heart conditions are actually diagnosed and how patients are evaluated. The goal is to improve diagnostic accuracy and unders…

This study looks at whether people with certain heart rhythm disorders also carry genetic variants linked to a rare muscle condition called non-dystrophic myotonia. Researchers will review medical records of 570 participants and invite some for a neurological exam and electromyog…