Case history
A 61-year-old female who slightly felt the dyspnea on effort and was admitted to our center. 24-hours electrocardiogram (ECG) showed a total of 50000 ventricular premature contractions (VPC) and the left ventricular ejection fraction (LVEF) was reduced by 35%. Although the origin was likely originated from the junction between the left and right coronary cusp, catheter manipulation below the cusp was difficult due to the anatomical reason. Fortunately, a single radiofrequency application above the right coronary cusp (RCC) near the left coronary cusp (LCC) – right coronary cusp (RCC) junction could eliminate the VPCs. Her symptom disappeared immediately after the procedure, and no VPC recurred and LVEF was normalized 6 months after the procedure. LGE-MRI could excellently visualize the RF lesion at the myocardial crescent beneath the interleaflet triangle.