Document Detail


Altered structure of small cerebral arteries in patients with essential hypertension.
MedLine Citation:
PMID:  19300112     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Structural alterations in the microcirculation may be considered an important mechanism of organ damage. An increased media-to-lumen ratio of subcutaneous small resistance arteries has been demonstrated to predict the development of cardiocerebrovascular events in hypertensive patients. Alterations in the structure of small cerebral arteries have been demonstrated in animal models of experimental or genetic hypertension. However, no evaluation with reliable techniques has ever been performed in humans. DESIGN AND METHODS: Twenty-eight participants were included in the present study: they were 13 hypertensive patients and 15 normotensive individuals. All participants underwent a neurosurgical intervention for benign or malign tumors. A small portion of morphologically normal cerebral tissue was excised from surgical samples and examined. Cerebral small resistance arteries (relaxed diameter around 200 mum) were dissected and mounted on an isometric and isobaric myograph, and the tunica media to internal lumen ratio was measured. In addition, cerebral cortical microvessel density (MVD) was also evaluated. The tissue was sectioned and stained for CD31, and MVD was measured with an automated image analyzer (percentage of area stained). Blood pressure values were evaluated, before surgical intervention, by standard sphygmomanometry. RESULTS: M/L was significantly greater and MVD significantly lower in hypertensive patients than that in normotensive individuals. No difference between groups in collagen content or mechanical properties of cerebral small arteries was observed. CONCLUSION: Our results indicate that structural alterations of small cerebral vessels are present in hypertensive patients compared with normotensive individuals, similar to those previously observed in subcutaneous small arteries.
Authors:
Damiano Rizzoni; Carolina De Ciuceis; Enzo Porteri; Silvia Paiardi; Gianluca E M Boari; Pietro Mortini; Claudio Cornali; Marco Cenzato; Luigi F Rodella; Elisa Borsani; Nicola Rizzardi; Caterina Platto; Rita Rezzani; Enrico Agabiti Rosei
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of hypertension     Volume:  27     ISSN:  1473-5598     ISO Abbreviation:  J. Hypertens.     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-03-20     Completed Date:  2009-08-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  England    
Other Details:
Languages:  eng     Pagination:  838-45     Citation Subset:  IM    
Affiliation:
Clinica Medica, Department of Medical and Surgical Sciences, University of Brescia, Brescia, Italy. rizzoni@med.unibs.it
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Biomechanics
Cerebral Arteries / chemistry,  pathology*,  physiopathology
Collagen / blood
Female
Humans
Hypertension / pathology*
Male
Microcirculation
Middle Aged
Tunica Media / pathology
Vascular Resistance
Chemical
Reg. No./Substance:
9007-34-5/Collagen
Comments/Corrections
Comment In:
J Hypertens. 2009 Apr;27(4):709-11   [PMID:  19300108 ]
J Hypertens. 2009 Sep;27(9):1923-4; author reply 1924-5   [PMID:  19692849 ]

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