Clinical Research Directory

Inclusion Criteria: * Written informed consent provided voluntarily by the subject * Age ≥ 19 years * Patients who undergo standard 12-lead ECG measurement during the study period * Subjects with sinus rhythm on ECG at the time of examination * Subjects available for additional 1-lead ECG measurement during the same visit Exclusion Criteria: * Subjects deemed inappropriate or unlikely to comply with the study requirements by the investigator * Patients with atrial fibrillation or atrial flutter on ECG at the time of examination * Patients with pacing rhythm due to a pacemaker * Subjects with severe tremor, uncooperativity, or skin conditions that make 1-lead ECG measurement difficult * Subjects whose additional study measurements would delay standard medical care due to a critical medical condition * Withdrawal of consent or refusal to agree to personal information usage * ECG with sub-standard quality (unanalyzable noise, lead disconnection, etc.; note: unanalyzable rate evaluation can be recorded separately)