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• W2000227958 abstract "Letters15 October 1995Noninvasive Carotid Artery TestingC. Y. Oliver Wong, MBBS, PhD, William J. MacIntyre, PhD, and Raymundo T. Go, MDC. Y. Oliver Wong, MBBS, PhDThe Cleveland Clinic Foundation; Cleveland, OH 44195Search for more papers by this author, William J. MacIntyre, PhDThe Cleveland Clinic Foundation; Cleveland, OH 44195Search for more papers by this author, and Raymundo T. Go, MDThe Cleveland Clinic Foundation; Cleveland, OH 44195Search for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-123-8-199510150-00015 SectionsAboutVisual AbstractPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail TO THE EDITOR:We enjoyed the recent article by Blakeley and colleagues [1]. We were surprised, however, that they did not discuss functional nuclear noninvasive tests. In an era of cost-consciousness, functional imaging is becoming increasingly important for patient management, and general internists should be kept abreast of these available tests. In recent years, noninvasive functional perfusion imaging of the brain with carbon dioxide or acetazolamide challenge using single-photon emission computed tomography (SPECT) has been widely investigated for detecting substantial carotid disease and its functional effects on the brain [2-5]. These tests are similar to myocardial perfusion imaging with thallium-201, with which pharmacologic stress tests are used to diagnose coronary artery disease. In the stress brain perfusion study, the patient is given a radiotracer for measurement of cerebral perfusion at a baseline state. This procedure is followed by another injection of radiotracer after carbon dioxide or acetazolamide challenge. The change in perfusion between these two studies indicates the cerebral vasomotor reserve. Those who are at risk for stroke show decreased vasomotor reserve.In patients who have had a transient ischemic attack, even baseline cerebral perfusion SPECT imaging is clinically helpful in predicting outcome. In a study of 12 patients who had transient ischemic attacks, 3 of 4 patients (75%) who had abnormal baseline cerebral SPECT imaging results after these attacks had a stroke within 3 to 7 days, whereas none of the 8 patients with normal brain SPECT results had a stroke as late as 1.5 to 8 months of follow-up [4]. It is expected that this noninvasive nuclear cerebral perfusion test, which has a cost similar to that of magnetic resonance angiography, will become more influential in the management decision for significant carotid disease. This nuclear cerebral perfusion test does not have the limitations of procedures mentioned in the review article [1]. The test has the additional advantage of directly visualizing the cerebral perfusion effects of substantial unilateral carotid stenosis, the relative importance of bilateral carotid disease, and intracranial vascular disease. Although the authors claimed that noninvasive tests cannot replace invasive angiography for surgical candidates, it should be noted that the nuclear stress brain SPECT study is the only comprehensive noninvasive test for carotid artery disease that can supplement angiography with important additional information on the status of cerebral perfusion to help in the decision-making process for revascularization [5].References1. Blakeley DD, Oddone EZ, Hasselblad V, Simel DL, Matchar DB. Noninvasivive carotid artery testing. A meta-analytic review. Ann Intern Med. 1995; 122:360-7. Google Scholar2. Oku N, Matsumoto M, Hashikawa K, Moriwaki H, Okazaki Y, Seike Y, et al. Carbon dioxide reactivity by consecutive technetium-99m-HMPAO SPECT in patients with a chronically obstructed major cerebral artery disease. J Nucl Med. 1994; 35:32-40. Google Scholar3. Ramsay SC, Yeates MG, Lord RS, Hille N, Yeates P, Eberl S, et al. Use of technetium-HMPAO to demonstrate changes in cerebral blood flow reserve following carotid endarterectomy. J Nucl Med. 1991; 32:1382-6. Google Scholar4. Bogousslavsky J, Delaloye-Bischof A, Regli F, Delaloye B. Prolonged hypoperfusion and early stroke after transient ischemic attack. Stroke. 1990; 21:40-6. Google Scholar5. Wong CY, Chyatte D, MacIntyre WJ, et al. Pre-surgical evaluation of vasomotor reserve in patients with cerebraovascular disease (CVD) undergoing encephalo-myosynangiosis, bypass and endarterectomy [Abstract]. J Nucl Med. 1995; 36 [In press]. Google Scholar Comments0 CommentsSign In to Submit A Comment Author, Article, and Disclosure InformationAffiliations: The Cleveland Clinic Foundation; Cleveland, OH 44195 PreviousarticleNextarticle Advertisement FiguresReferencesRelatedDetails Metrics 15 October 1995Volume 123, Issue 8Page: 633-634KeywordsAngiographyBrainBrain diseasesCarbon dioxideCarotid arteriesIschemic strokeStenosisStrokeTransient ischemic attacksVascular diseases Issue Published: 15 October 1995 CopyrightCopyright © 1995 by American College of Physicians. All Rights Reserved.PDF DownloadLoading ..." @default.
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