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<dc:title xml:lang="fr">Etude expérimentale évaluant l’effet de l’urapidil sur le tonus artériel et sa capacité à préserver la vasoconstriction hypoxique dans l’artère pulmonaire</dc:title>
<dcterms:alternative xml:lang="en">Experimental study evaluating the effect of urapidil on vascular tone and its ability to preserve hypoxic vasoconstriction in the pulmonary artery</dcterms:alternative>
<dc:subject xml:lang="fr">Hypertension artérielle</dc:subject>
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<dc:subject xml:lang="fr">Vasoconstriction hypoxique</dc:subject>
<dc:subject xml:lang="en">Arterial Hypertension</dc:subject>
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<dcterms:abstract xml:lang="fr">La prise en charge d’une hypertension artérielle est un enjeu majeur dans certaines situations à risque telles que la pré-éclampsie ou chez les patients avec une pathologie respiratoire pour lesquels la vasoconstriction hypoxique pulmonaire est bénéfique. L’urapidil est un antihypertenseur d’action mixte associant une action antagoniste sur les récepteurs alpha-1 adrénergiques post synaptiques périphériques et une baisse du tonus sympathique par action centrale qui pourrait impliquer à la fois un blocage des récepteurs alpha-1 et une activité agoniste sérotoninergique sur les récepteurs 5HT1A qui limite la survenue d’une tachycardie reflexe. La première étude indique que les récepteurs 5HT1A périphériques ne semblent pas impliqués dans les effets vasculaires périphériques de l’urapidil, qui seraient principalement le résultat du blocage des récepteurs alpha 1 adrénergiques. La deuxième étude montre que l’urapidil préserve la VHP contrairement à la nicardipine et la clévidipine qui l’inhibent.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Urapidil, a vasodilator, is widely used in the treatment of hypertension mostly due to better patient tolerance. Urapidil has a dual action: firstly it works as a selective alpha1- adrenoreceptor antagonist and secondly as an agonist of 5-HT1A receptors in the central nervous system. Thus, the present findings, while confirming that urapidil is a potent inhibitor of alpha 1-adrenoceptor-induced contraction targeting preferentially arteries with an endothelial dysfunction, do not support the role of 5-HT1A receptor activation in the control of the vascular tone in response to urapidil in the three types of blood vessels studied. In conclusion, this trial showed that in our experimental setting, urapidil preserved the hypoxia triggered vasoconstriction in isolated pulmonary vessels. Conversely, both calcium channel inhibitors nicardipine and clevidipine blunted the vasocontrictor reaction to hypoxia. These findings may have important clinical consequences that deserve further evaluation.</dcterms:abstract>
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