Endothelial dysfunction in resistance arteries is related to high blood pressure and circulating low density lipoproteins in previously treated hypertension.

Abstract:

BACKGROUND:Peripheral endothelial dysfunction has been demonstrated in hypertension. However, its relationship to blood pressure (BP) load, vascular structure, and metabolic disturbances in patients with long-standing, previously treated hypertension is unclear. METHODS:A total of 41 patients with stage I to III essential hypertension and electrocardiographic left ventricular hypertrophy were studied. After 2 to 3 weeks of placebo treatment we measured nitroprusside-induced relaxation (NIR), acetylcholine-induced relaxation (AIR), and media:lumen ratio in isolated, subcutaneous resistance arteries by myography, as well as 24-h ambulatory BP, and serum lipids. RESULTS:Maximal AIR correlated negatively with median 24-h diastolic BP (r=-0.42, P=.01), and sensitivity to AIR correlated negatively with serum low density lipoprotein (LDL) (r =-0.36, P < .05). In multiple regression analyses, sensitivity to AIR correlated negatively with serum LDL (beta=-0.33) independently of maximal NIR (beta=0.41) (adjusted R2 =0.26, P < .01). Maximal acetylcholine-induced relaxation correlated negatively with median 24-h diastolic BP (beta=-0.38) independently of maximal NIR (beta=0.45) (adjusted R2= 0.32, P < .001). Acetylcholine-induced relaxation was not significantly related to diabetes or to media:lumen ratio (r = -0.26, NS). CONCLUSIONS:High diastolic BP and high serum LDL were associated with impaired maximal AIR and reduced sensitivity to AIR, respectively, independently of smooth muscle cell responsiveness to nitroprusside. This indicated decreasing endothelial function in small resistance arteries with increasing BP and increasing LDL in hypertension. Endothelial function was not significantly related to vascular structure of the resistance arteries or to diabetes in these patients with long-standing hypertension.

journal_name

Am J Hypertens

authors

Olsen MH,Wachtell K,Aalkjaer C,Devereux RB,Dige-Petersen H,Ibsen H

doi

10.1016/s0895-7061(01)02148-3

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

861-7

issue

9 Pt 1

eissn

0895-7061

issn

1941-7225

pii

S0895-7061(01)02148-3

journal_volume

14

pub_type

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