['Patch testing is thought to be necessary prior to metal device implantation to rule out metal allergy-related complications; however, there are controversies over the effects of nickel allergy on the outcome of nickel alloy-based device implantation.', 'This study aimed to evaluate the adverse events in a Korean population of nickel allergy patients who underwent atrial septal defect (ASD) closure with a nickel-titanium alloy-based device.', 'We retrospectively reviewed the medical records of patients who underwent ASD closure with a nitinol device.', 'Among 38 patients who had ASD closure, 4 of 5 nickel-allergic patients and 10 of the 33 non-nickel-allergic patients had post-closure complications. All patients fared well, without device failure culminating in device removal.'] Do positive reactions to nickel on a patch test predict clinical outcome of nickel alloy-based atrial septal defect occluder implantation?