An Exploratory Clinical Study to Evaluate the Specificity of Magnetocardiogram in Atrial Fibrillation and the Prediction of Recurrence

Group: Group 1 (Persistent AF) Inclusion criteria： * Persistent AF is recorded by ECG before the examination of the magnetocardiogram; * Detailed clinical records, including medical history, cardiovascular risk factors, blood tests, and antiarrhythmic drug therapy; * It is recommended that antiarrhythmic drugs be discontinued at least 5 days before the examination and continue if atrial fibrillation occurs or the symptoms of atrial fibrillation are obvious; Exclusion criteria: * Severe valvular heart disease, structural heart disease, heart function classification ≥ New York Heart Association functional class II, history of ischemic heart disease, left ventricular ejection fraction \< 50%, hyperthyroidism, primary pulmonary hypertension, and respiratory disease; * Patients after radiofrequency ablation; * The implanted devices in the body effect the magnetic signal during the detection process, such as prosthetic limbs, heart stents or valves contain metal material. * Unable to maintain the supine position during the examination. Group: Group 2 (Paroxysmal AF) Inclusion criteria: * Persistent AF is recorded by ECG before the examination of the magnetocardiogram; * Detailed clinical records, including medical history, cardiovascular risk factors, blood tests, and antiarrhythmic drug therapy; * It is recommended that antiarrhythmic drugs be discontinued at least 5 days before the examination and continue if atrial fibrillation occurs or the symptoms of atrial fibrillation are obvious; Exclusion criteria: * Severe valvular heart disease, structural heart disease, heart function classification ≥ New York Heart Association functional class II, history of ischemic heart disease, left ventricular ejection fraction \< 50%, hyperthyroidism, primary pulmonary hypertension, and respiratory disease; * Patients after radiofrequency ablation; * The implanted devices in the body effect the magnetic signal during the detection process, such as prosthetic limbs, heart stents or valves contain metal material. * Unable to maintain the supine position during the examination. Group: Control group Inclusion criteria: * No history of AFor other arrhythmias; * Detailed clinical records, including medical history and cardiovascular risk factors; Exclusion criteria: * severe valvular heart disease, structural heart disease,heart function classification ≥ New York Heart Association functional class II, history of ischemic heart disease, left ventricular ejection fraction \< 50%, hyperthyroidism, primary pulmonary hypertension, and respiratory disease; * The implanted devices in the body effect the magnetic signal during the detection process, such as prosthetic limbs, heart stents or valves contain metal material. * Unable to maintain the supine position during the examination.