Document Detail

Preserved acetazolamide reactivity in lacunar patients with severe white-matter lesions: 15O-labeled gas and H2O positron emission tomography studies.
MedLine Citation:
PMID:  22252236     Owner:  NLM     Status:  MEDLINE    
Limited evidence exists on the relationships between severity of white-matter lesions (WMLs) and cerebral hemodynamics in patients without major cerebral artery disease. To examine changes of cerebral blood flow (CBF), oxygen metabolism, and vascular reserve capacity associated with severity of WML in patients with lacunar stroke, we used a positron emission tomography (PET). Eighteen lacunar patients were divided into two groups according to the severity of WMLs, assessed by Fazekas classification; grades 0 to 1 as mild WML group and grades 2 to 3 as severe WML group. Rapid dual autoradiography was performed with (15)O-labeled gas-PET followed by (15)O-labeled water-PET with acetazolamide (ACZ) challenge. Compared with the mild WML group, the severe WML group showed lower CBF (20.6±4.4 versus 29.9±8.2 mL/100 g per minute, P=0.008), higher oxygen extraction fraction (OEF) (55.2±7.4 versus 46.7±5.3%, P=0.013), and lower cerebral metabolic rate of oxygen (CMRO(2)) (1.95±0.41 versus 2.44±0.42 mL/100 g per minute, P=0.025) in the centrum semiovale. There were no significant differences in the ACZ reactivity between the two groups (48.6±22.6% versus 42.5±17.2%, P=0.524). Lacunar patients with severe WMLs exhibited reduced CBF and CMRO(2), and increased OEF in the centrum semiovale. The ACZ reactivity was preserved in both patients with severe and mild WMLs in each site of the brain.
Tomohisa Nezu; Chiaki Yokota; Toshiyuki Uehara; Miho Yamauchi; Kazuhito Fukushima; Kazunori Toyoda; Masayasu Matsumoto; Hidehiro Iida; Kazuo Minematsu
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-18
Journal Detail:
Title:  Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism     Volume:  32     ISSN:  1559-7016     ISO Abbreviation:  J. Cereb. Blood Flow Metab.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-01     Completed Date:  2012-07-03     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  8112566     Medline TA:  J Cereb Blood Flow Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  844-50     Citation Subset:  IM    
Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan.
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MeSH Terms
Cerebellum / blood supply,  metabolism*,  radiography*
Cerebrovascular Circulation / drug effects
Glycine / analogs & derivatives*,  pharmacology
Positron-Emission Tomography*
Stroke, Lacunar / metabolism*,  radiography*
Reg. No./Substance:
2620-63-5/N-acetylglycinamide; 56-40-6/Glycine

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