Clinical Investigation to Evaluate the Effectiveness and Safety of ECG App

Inclusion criteria

• Patients over 18 years old, regardless of gender;
• Participants who meet one of the following conditions according to the medical history in the past 3 months or the ECG during the screening period:

• Patients with normal sinus rhythm;
• Patients with persistent or permanent paroxysmal atrial fibrillation or in the onset of paroxysmal atrial fibrillation;
• Patients with frequent premature beats (more than 5 per minute) or in the onset of premature beats;
• Patients who have good compliance, and can cooperate to complete this research by himself/herself; 4）Patients who volunteer to participate and have signed an informed consent form.

Exclusion criteria

• Patients using cardiac pacemakers or implantable cardioverter defibrillators (ICD);
• Patients with atrioventricular block or bundle branch block;
• Patients with significant sinus arrhythmia, sinus arrest or sick sinus syndrome;
• Patients with interpolated premature beats, junctional premature beats, or escape rhythms;
• Patients with atrial tachycardia, atrial flutter, ventricular tachycardia, ventricular flutter, or ventricular fibrillation;
• Patients with a resting heart rate of slower than 50 beats/minute or faster than 110 beats/minute;
• Patients with atrial fibrillation complicated with premature beats;
• Patients who are critically ill, making it difficult to make an accurate assessment of the effectiveness and safety of the device;
• Patients who suffer from tremor diseases or chorea, making it difficult to complete the examination quietly;
• Patients with bullous diseases or large-area skin rashes that are not suitable for body surface electrode recording;
• Patients whose skin is allergic to ethanol;
• Patients with contagious skin diseases;
• Patients with a history of mental illness or with cognitive impairment;
• Patients who have participated in other clinical investigations within the past 30 days that may affect this investigation; 15） Other conditions that the investigators consider inappropriate for participation in the investigation.