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Titolo:
QUANTITATIVE MORPHOLOGIC STUDY OF INTIMAL THICKENING AT THE HUMAN CAROTID BIFURCATION .2. THE COMPENSATORY ENLARGEMENT RESPONSE AND THE ROLE OF THE INTIMA IN TENSILE SUPPORT
Autore:
MASAWA N; GLAGOV S; ZARINS CK;
Indirizzi:
UNIV CHICAGO,DEPT PATHOL,5841 S MARYLAND AVE CHICAGO IL 60637 UNIV CHICAGO,DEPT PATHOL CHICAGO IL 60637 UNIV CHICAGO,DEPT SURG CHICAGO IL 60637 DOKKYO UNIV,SCH MED,DEPT PATHOL TOCHIGI JAPAN
Titolo Testata:
Atherosclerosis
fascicolo: 2, volume: 107, anno: 1994,
pagine: 147 - 155
SICI:
0021-9150(1994)107:2<147:QMSOIT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATHEROSCLEROSIS; PLAQUE; LOCALIZATION; ARTERIES;
Keywords:
CAROTID BIFURCATION; INTIMAL THICKENING; ATHEROSCLEROSIS; ARTERY ENLARGEMENT; WALL TENSILE STRESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
N. Masawa et al., "QUANTITATIVE MORPHOLOGIC STUDY OF INTIMAL THICKENING AT THE HUMAN CAROTID BIFURCATION .2. THE COMPENSATORY ENLARGEMENT RESPONSE AND THE ROLE OF THE INTIMA IN TENSILE SUPPORT", Atherosclerosis, 107(2), 1994, pp. 147-155

Abstract

Arteries enlarge where intimal plaques form, tending to preserve lumen cross sectional area but causing an increase in mural tangential tension due to the increase in radius. To characterize the compensatory enlargement process at the carotid bifurcation and to evaluate the possible contribution of intima thickening to mural tensile support duringthe enlarging process, we assessed the relationships among intimal thickening, artery size and estimated tensile stress at 9 sequential axial levels in 42 human carotid bifurcations obtained during post-mortemexaminations of 36 adults with no clinical or anatomical evidence of cerebrovascular disease. Right and left bifurcations were available for 6 patients. The arteries were fixed under conditions of controlled pressure distention and histologic sections were prepared at 0.5 cm axial intervals. We determined vessel radius (r), intima thickness (IT), media thickness (MT), intima area (IA), lumen area (LuA) and the area encompassed by the internal elastic lamina (IELA), i.e. the lumen areaif there were no intimal thickening. Although IT, IA and r were greatest in the proximal sinus region, there was a highly significant linear relationship between IA and IELA at each axial level; correlation coefficients ranged from 0.64 to 0.97 with P < 0.001 at each level. Stenosis (IA/IELA x 100) ranged from 10.8 +/- 8.0% at the common carotid level immediately proximal to the bifurcation angle to 22.3 +/- 17.9% at the level immediately distal to the angle, but LuA remained nearly constant at each level regardless of IA. When wall tensile stress (TS) was computed using only media thickness (MT), values ranged from 8.2 +/- 2.5 to 17 +/- 7.0 x 10(5) dyn/cm(2) (1 dyn = 10(-5) N) with the maximum occurring at the proximal sinus. When, however, total wall thickness (IT + MT) was used, TS was similar at all levels with a mean of 6.5 +/- 2.5 x 10(5) dyn/cm(2), (range, 5.5 +/- 1.8 to 7.3 +/- 2.7 x 10(5) dyn/cm(2)) with no significant differences among the 9 levels, including those with little or no intimal thickening. We conclude that during stages of minimal or moderate intimal thickening and plaque formation at the carotid bifurcation, artery size (IELA) at each level increases with IA, thereby preserving LuA. The sum of intima and media thickness corresponds to the increase in radius such that estimated tangential mural tensile stress remains normal at each level.

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Documento generato il 30/09/20 alle ore 05:07:35