Increased response of brachial artery diameter to norepinephrine in hypertensive patients
Détails
ID Serval
serval:BIB_92DA0C76C7D6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Increased response of brachial artery diameter to norepinephrine in hypertensive patients
Périodique
American Journal of Physiology. Heart and Circulatory Physiology
ISSN
0363-6135
ISSN-L
0363-6135
Statut éditorial
Publié
Date de publication
07/1988
Volume
255
Numéro
1 Pt 2
Pages
H36-43
Notes
Clinical Trial Controlled Clinical Trial Journal Article Research Support, Non-U.S. Gov't --- Old month value: Jul
Résumé
The hyperresponsiveness of small arteries to norepinephrine is well documented in essential hypertensive patients. Our objective was to investigate in situ the reactivity to norepinephrine of the diameter of large arteries, which are involved in the arterial disease of hypertension as well as small arteries. Brachial artery diameter, blood flow velocity, local volumic blood flow, and local vascular resistances were determined noninvasively with a pulsed Doppler system in 19 patients with essential hypertension and 9 normotensive subjects, before and after the administration of placebo (glucose) or increasing doses of norepinephrine (10, 20, and 40 ng.kg-1.min-1 iv) given in a single-blind fashion. In hypertensive patients, norepinephrine (40 ng.kg-1.min-1) induced 1) a significant decrease in brachial artery diameter, local blood velocity, volumic flow, and conductance and 2) a small increase in mean arterial pressure. These hemodynamic changes did not occur in the placebo group and were significantly greater in hypertensive patients than in normotensive subjects, although plasma norepinephrine increased to the same extent in both groups. We conclude that in hypertensive patients the increase in vascular reactivity to norepinephrine involves not only the resistive vessels but also the large arteries thus decreasing their conducting and buffering function.
Mots-clé
Adult Blood Volume Brachial Artery/*drug effects Epinephrine/blood Female Hemodynamic Processes Humans Hypertension/*physiopathology Male Norepinephrine/blood/*pharmacology Regional Blood Flow/drug effects
Pubmed
Web of science
Création de la notice
05/03/2008 17:40
Dernière modification de la notice
20/08/2019 15:55