Carbon dioxide-enhanced angiography for detection of colonic diverticular bleeding and clinical outcomes.

Purpose: To determine the ability of CO-enhanced angiography to detect active diverticular bleeding that is not detected by iodinated contrast medium (ICM)-enhanced angiography and its impact on clinical outcomes when used to confirm embolization, particularly the risks of rebleeding and ischemic complications.

Materials And Methods: We retrospectively identified a cohort of patients with colonic diverticular bleeding who underwent catheter angiography between August 2008 and May 2023 at our institution. We divided them according to whether they underwent CO angiography following a negative ICM angiography study or to confirm hemostasis post-embolization (the CO angiography group) or ICM angiography alone in the absence of active bleeding or for confirmation of hemostasis post-embolization (the ICM angiography group). The ability to detect active colonic diverticular bleeding and clinical outcomes were compared between the two groups.

Results: There were 31 patients in the ICM angiography group and 29 in the CO angiography group. The rate of detection of active bleeding by CO angiography that was not identified by ICM angiography was 48%. The rebleeding rate was 23% in the ICM angiography group and 6.9% in the CO angiography group. Among the patients who underwent TAE, the ischemic complications rate was 7.1% in the ICM angiography group and 4.5% in the CO angiography group.

Conclusions: CO angiography may detect active diverticular bleeding that is not detectable by ICM angiography and appears to be associated with a lower rebleeding rate.

Level Of Evidence: IV.