Biomechanics of resistance artery wall remodeling in angiotensin-II hypertension and subsequent recovery.

Abstract:

BACKGROUND/AIMS:To identify the relationship between systemic and local hemodynamics, as well as segmental biomechanical properties in a musculocutaneous resistance artery during angiotensin-II hypertension and its recovery. METHODS:Rats were infused with angiotensin-II using implanted osmotic minipumps (ALZET 2ML4, 150 ng/kg/min) for 4 weeks. Measurements were made either immediately following infusion or after an additional 4-week recovery period. Parallel controls were created. Segmental geometry and blood flow were determined in vivo on microsurgically exposed segments of the saphenous arterial branch (350 mum). Pressure-radius plots of excised cylindrical segments were recorded by pressure arteriography. RESULTS:Eutrophic hypertensive wall remodeling developed, with reduced passive radius, increased wall thickness, elevated low-stress elastic modulus, reduced norepinephrine contraction, and reduced endothelium-mediated dilation. Relaxed wall geometry fully healed in 4 weeks of recovery, but an increased contractility and a reduced in vivo lumen persisted. Regional hemodynamic resistance correlated positively with systemic arterial pressure and wall thickness in vivo, and negatively with in vivo lumen size throughout these studies. CONCLUSION:A partial recovery of the biomechanical parameters was found. Healing of eutrophic hypertensive remodeling of the resistance artery wall is a complex biomechanical process, not a simple reversal of the original pathological sequel.

journal_name

Kidney Blood Press Res

authors

Nádasy GL,Várbíró S,Szekeres M,Kocsis A,Székács B,Monos E,Kollai M

doi

10.1159/000285847

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

37-47

issue

1

eissn

1420-4096

issn

1423-0143

pii

000285847

journal_volume

33

pub_type

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