title: Association between hemodynamics in the common carotid artery and severity of carotid atherosclerosis in patients with essential hypertension.
abstract: BACKGROUND
  Carotid intima-media thickness (IMT) and plaque burden evaluated by B-mode ultrasound have been used as relevant indicators for carotid atherosclerosis. This study was aimed to investigate the relationship between hemodynamic parameters in the common carotid artery (CCA) and the severity of carotid atherosclerosis in untreated hypertensive patients.
  
  
  METHODS
  Carotid IMT and plaque burden were evaluated in bilateral CCA, bifurcations, external and internal carotid arteries using duplex ultrasound in 80 untreated hypertensive patients. The patients were divided into four groups according to plaque burden. Hemodynamic parameters of CCA, including peak and mean circumferential wall tension (CWT), tensile stress (TS), wall shear stress (WSS), and Young's elastic modulus (YEM), were calculated after measurements of internal diameter (ID), IMT, and peak and mean flow velocities of CCA. Arterial stiffness was also assessed using the brachial-ankle pulse wave velocity (baPWV).
  
  
  RESULTS
  Age, pulse pressure, creatinine, carotid IMT, and mean TS were shown to have significant differences among the four plaque groups (P < 0.05). Peak CWT and peak TS were also shown to have marginal differences. In univariate analysis, the peak and mean CWT and TS were significantly correlated with plaque score. Stepwise multiple regression analysis showed that carotid IMT, age, and peak CWT were independently associated with plaque score.
  
  
  CONCLUSIONS
  These results suggest that the CWT and TS of the CCA are associated with the severity of carotid atherosclerosis in untreated hypertensive patients. Hence, the hemodynamics of vessels may contribute to the plaque burden of low-resistance arteries.
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Kaohsiung Municipal United Hospital, Kaohsiung, Taiwan.
authors.forename: Min Y
authors.initials: MY
authors.lastname: Lee
authors.forename: Chan M
authors.initials: CM
authors.lastname: Wu
authors.forename: Kuo H
authors.initials: KH
authors.lastname: Yu
authors.forename: Chih S
authors.initials: CS
authors.lastname: Chu
authors.forename: Kun T
authors.initials: KT
authors.lastname: Lee
authors.forename: Sheng H
authors.initials: SH
authors.lastname: Sheu
authors.forename: Wen T
authors.initials: WT
authors.lastname: Lai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000842:Ankle / Q000098:blood supply; D001783:Blood Flow Velocity; D001794:Blood Pressure; D001916:Brachial Artery / Q000503:physiopathology; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology*; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D004548:Elasticity; D005260:Female; D006439:Hemodynamics; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D012307:Risk Factors; D012720:Severity of Illness Index; D013314:Stress, Mechanical; D018616:Ultrasonography, Doppler, Duplex