Assessment of Reconstruction and Inverse Reconstruction in Right Atrium by Multimodal Echocardiographic Techniques

Inclusion Criteria: 1. With a history of paroxysmal Af (PAF) and PAF record within 6 months prior to ablation, confirming at least one of the following findings: AF lasting for ≥30 s recorded in Holter or 12-lead ECG. 2. No response to more than one antiarrhythmic drug, or unwilling to receive longterm drug treatment. 3. Can provide informed consent form expressing willingness to participate in the study and comply with follow-up tests and evaluation procedures. 4. Aged 18-80 years. Exclusion Criteria: 1. With acute diseases, such as acute phase after myocardial infarction (within 3 months), within 3 months after acute heart failure or new cerebral infarction; 2. In the list of heart transplantation; 3. Expected survival less than 1 year; 4. With other hemorrhagic diseases and anticoagulant therapy is not allowed; 5. Thrombosis in left atrium; 6. Heart failure, New York Heart Association(NYHA) III/IV or eject fraction(EF)\<40%; 7. Patients with uncontrolled cancer; 8. Significant hepatic or renal impairment (and/or alanine transaminase(ALT) or Aspartate transaminase(AST) \>2 times upper limit of normal, creatinine clearance rate(CCr)\<50%); 9. Previous catheter radiofrequency ablation for AF or cardiac surgery; 10. Pregnant and lactating women, women who plan to become pregnant, or women of child bearing age not using reliable contraceptive measures.