Fitbit vs. hospital ECG: can a smartwatch save hearts?

This study is testing whether a Fitbit can accurately measure heart electrical activity (QT interval) in 80 adults with Long QT Syndrome, a condition that can cause dangerous heart rhythms. Participants will use a Fitbit to take weekly ECG readings at home, which will be compared to standard hospital ECGs. The goal is to see if wearable devices can reliably track heart health and help explain symptoms, potentially reducing the need for frequent clinic visits.