Objective: Not all endoscopic clips are compatible with magnetic resonance imaging (MRI).
The aim of this study is to investigate the safety of MRI-incompatible endoscopic clips in patients
undergoing MRI scans.
Methods: We retrospectively reviewed the medical records of patients who had received endoscopic
clip placement of Olympus Long Clip MRI-incompatible clips and then had undergone MRI
scans within two weeks in our hospital between 2014 and 2019.
Results: A total of 44,292 patients had undergone an MRI examination at our hospital. Only 15 patients
had MRI scans within two weeks after the endoscopic clip placement. Their median age was
65.5 years, and 12 of the 15 patients were men. At the time of the clip placement and MRI scan,
four patients were taking anti-coagulation or anti-platelet agents. The indication for endoscopic
clip placement of the 15 patients was mucosal/submucosal defect or hemorrhage and colonic perforation.
Endoscopic clips were placed in the colon of 14 patients and in the stomach of only one patient
for gastric hemorrhage. One patient experienced clip migration and three displayed artifacts in
abdominal images. No patient complications of mortality, hemorrhage, or organ perforation occurred.
Conclusion: No serious adverse event occurred during MRI scans of patients with MRI-incompatible
clips in this study, suggesting that MRI-incompatible clips may be safe to use in MRI scans.
However, this does not guarantee the safety of the Long Clip for MRI scans, as further tests are
needed to verify that this clip is safe for use during MRI.