title: Platelet accumulation in carotid atherosclerotic lesions: semiquantitative analysis with indium-111 platelets and technetium-99m human serum albumin.
abstract: To evaluate platelet accumulation in carotid atherosclerotic lesions semiquantitatively, a dual-tracer technique was applied, using In-111 platelets and Tc-99m human serum albumin. With this approach, we investigated the ratio of radioactivity in In-111 platelets deposited on the vascular wall to those circulating in the blood pool, platelet accumulation index ( PAI ). This study included 12 normal subjects and 25 patients with ischemic cerebrovascular disease (CVD). Angiographic abnormalities were observed at 34 of 50 carotid bifurcations in the CVD patients. The mean PAI value was significantly higher at the carotid bifurcations with angiographic abnormality than at the normal ones (p less than 0.001). Furthermore, elevations of mean PAI were prominent at the lesions with severe stenosis or ulceration. The degree of platelet accumulation was well demonstrated by this technique, which can also yield information on thrombogenicity and efficiency of antiplatelet therapy in carotid atherosclerotic disease.
mesh_terms: D000328:Adult; D000368:Aged; D001792:Blood Platelets / Q000000981:diagnostic imaging*; D002341:Carotid Artery Thrombosis / Q000000981:diagnostic imaging*; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging; D002533:Cerebral Angiography; D006801:Humans; D007204:Indium; D002537:Intracranial Arteriosclerosis / Q000000981:diagnostic imaging*; D002546:Ischemic Attack, Transient / Q000000981:diagnostic imaging; D008875:Middle Aged; D011868:Radioisotopes; D011877:Radionuclide Imaging; D012588:Scintillation Counting / Q000379:methods; D012709:Serum Albumin; D013667:Technetium; D013668:Technetium Tc 99m Aggregated Albumin
chemical_list: D011868:Radioisotopes; D012709:Serum Albumin; D013668:Technetium Tc 99m Aggregated Albumin; D007204:Indium; D013667:Technetium