Background: To investigate the feasibility and safety of the O eccentric shape occluder in the interventional occlusion treatment of intracristal ventricular septal defect (IVSD). Methods: A retrospective analysis of the clinical data of 56 IVSD patients treated by interventional occlusion at our center, as well as recording of their intraoperative and postoperative status, was performed. Results: Of the 56 patients, a total of 48 patients underwent successful occlusion during the first surgical attempt. Four patients were transferred to the Surgery Department after occlusion when the largest occluder failed because of large defects. Two patients exhibited aortic valve regurgitation; 1 patient had mild regurgitation, which was not worsened after 6 months of follow-up. One patient had severe aortic regurgitation, and 2 days after the operation, the patient underwent a second operation. One patient exhibited a residual shunt, which was above the occluder; after 1 year of follow-up, re-occlusion was successful and eliminated the shunt. One patient developed complete right bundle branch block. Conclusion: Most IVSD interventional occlusion treatments are feasible and safe.

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