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February 4, 1974

Risk with Arterial Flow Probes

Author Affiliations

Bruce Kelham Surgical Laboratory Children's Hospital of San Francisco

JAMA. 1974;227(5):556. doi:10.1001/jama.1974.03230180054020

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To the Editor.—  Some vascular surgeons who are studying arterial blood flow after various forms of arterial reconstruction have measured blood flow with noncannulating flow probes; in some instances, the surgeons have left these probes in place for a few days after surgery. This has produced much useful information. Some surgeons have also measured carotid artery blood flow during surgery, but I do not believe that any probes have been left in place on this artery.Gerry, Fronek, and Witzel (Proc Soc Exp Biol Med 140:1477-1479, 1972) reported the thrombosis of carotid arteries in dogs when only pneumatic occluders were implanted on them. We have had the same problem after implanting flow probes on the common carotid artery in rhesus monkeys (for chronic studies). In addition, movement of the animal's head or neck frequently caused temporary, complete occlusion of the artery (indicated by zero flow). We believe that these problems