Arterial occlusion secondary to prior cardiac catheterization in a radial forearm flap-lessons learnt from an unusual case.

The radial forearm free flap (RFFF) is a workhorse flap for head and neck reconstruction. We present an unusual case of radial artery occlusion, likely from previous transradial cardiac catheterization, in a patient for whom an RFFF was raised for floor of mouth reconstruction following resection of squamous cell carcinoma. Pre-operative assessment with ultrasound Doppler and an Allen test was normal. The flap was raised uneventfully under tourniquet control. However, following flap elevation and tourniquet release, poor flap perfusion was noted, and cutback of the artery revealed a long segment of hard fibrous plaque within the lumen. Retrospective review of medical records showed a history of cardiac catheterization via the same radial artery. We discuss various measures that can prevent this occurrence, including careful pre-operative screening of previous procedures involving the radial artery, the reverse Allen test, Doppler ultrasound, and consideration of distal arterial exploration without a tourniquet.