Hearables: Ear-ECG and PPG for Detection of Cardiac Arrhythmias

The goal of this observational study is to determine the feasibility of detecting abnormal heart rhythms, known as arrhythmias, by recording Electrocardiogram (ECG) and Photoplethysmogram (PPG) waveforms from the ears in patients who have already been diagnosed with arrhythmias. The main questions it aims to answer are: * Can ECG and PPG signals from the ears reliably detect arrhythmias? * How do ear-based ECG/PPG waveforms compare to standard single-lead ECG in detecting abnormal rhythms? Researchers will compare data from healthy controls and arrhythmia patients to see if ear-based recordings are as effective as traditional methods.