ECST formulaEuropean Carotid Surgery Trial formula. A formula which assesses the degree of carotid arterial stenosis as a percentage reduction in vessel diameter. The minimum diameter of the arteries caused by stenosis (the maximum point of blood constriction) is compared with another diameter that represents the normal diameter of the carotid arteries when the patient is healthy, and uses the estimated normal lumen diameter at the site of the lesion based on a visual impression of where the normal artery wall was before development of the stenosis.
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