To the Editor.—
The risk involved with flow probes on the carotid artery was discussed by E. M. Cuthbertson (227: 556, 1974). The author warned against leaving electromagnetic flow probes on the carotid artery in man, the reason being that thrombosis of the artery and temporary complete occlusions due to head movements frequently occurred in experimental animals (dogs) when flow probes were implanted for long-term studies.Since July 1970, we have used implantable electromagnetic flow probes in the internal carotid artery after arterial reconstruction due to obstructive disease of the artery. Sixty patients were studied up to five days postoperatively. The method for implantation of the flow probe1 proved safe. Thrombosis occurred in only one patient in whom the flow probe was dislocated by the development of a hematoma caused by drainage tube clotting a few hours after surgery. There was no evidence that the flow probe per se caused
Samnegård H, Ekeström S. Risks With Arterial Flow Probes. JAMA. 1974;230(4):538. doi:10.1001/jama.1974.03240040016010
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