Arteriovenous fistula of the innominate artery occurred in a patient 3 weeks after retrograde brachial arterial catheterization was performed 1 day before aortocoronary bypass surgery. Intramural dissection was noted at catheterization, and a mediastinal hematoma at operation. Exploration of the hematoma in the course of catheterization might have prevented the arteriovenous fistula, which necessitated a second operation 3 weeks after the first. To our knowlege this complication of retrograde brachial catheterization has not previously been described. We recommend that known injuries to cervical or thoracic arteries occurring just before operations requiring extracorporeal circulation be explored to prevent late complications. Recent injuries to the cervical and thoracic arteries that are not acessible to external compression should be exposed and treated during sternotomy to prevent late complications if heparinization is contemplated.
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