Background: Use of radial and ulnar access has increased due to its perceived benefits over femoral access. Ulnar artery catheterization can place patients at risk of significant complications, including pseudoaneurysm, expanding hematoma, compartment syndrome, ulnar nerve injury, and critical hand ischemia. The purpose of this study was to describe complications specific to ulnar artery catheterization. Methods: After obtaining institutional review board approval, a retrospective review was performed on all patients who underwent ulnar artery catheterization at our institution between 2019 and 2021. Complications were assessed, and complication rates were compared with previously published studies on ulnar artery catheterization for coronary angiography (percutaneous coronary intervention). Results: A total of 41 patients were available for review with a mean age of 59 years. Of these, 17 patients (41%) sustained complications in the immediate postprocedural period. These complications included hematoma (12 patients, 29%), pseudoaneurysm (1 patient, 2%), ulnar artery thrombosis (1 patient, 2%), ulnar neuropathy (3 patients, 7%), arterial damage requiring repair (2 patients, 5%), transient ischemia (3 patients, 7%), and compartment syndrome (2 patients, 5%). Three of these patients (7%) required operative intervention, and several were admitted to the hospital for an additional period of observation. Conclusions: This series highlights the significant risks associated with ulnar artery catheterization for percutaneous procedures. Complications include pseudoaneurysm, expanding hematoma, compartment syndrome, ulnar nerve damage, and critical hand ischemia. Several of these patients required urgent or emergent surgical intervention, with some patients experiencing ongoing ulnar nerve symptoms.
