[Effect of changes in sympathetic vasomotor tonus on vasodilatatory effect of catecholamines].
The study of resistances modifications in the femoral vascular bed during bilateral carotide occlusion supports the hypothesis of an inhibitory action of isoprenaline on norepinephrine release by the sympathetic post-ganglionnic fibres. This action explain the relations between isoprenaline vasodilator potency and sympathetic activity level.
D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002200:Capillary Resistance / Q000187:drug effects*; D002339:Carotid Arteries / Q000502:physiology; D002395:Catecholamines / Q000494:pharmacology*; D004285:Dogs; D004837:Epinephrine / Q000494:pharmacology; D005263:Femoral Artery; D006614:Hindlimb / Q000098:blood supply; D007545:Isoproterenol / Q000494:pharmacology; D012039:Regional Blood Flow / Q000187:drug effects*; D013564:Sympathetic Nervous System / Q000502:physiology*; D014630:Vagus Nerve / Q000502:physiology
D002395:Catecholamines; D007545:Isoproterenol; D004837:Epinephrine
Influence des variations du tonus vasomoteur orthosympathique sur l'action vasodilatatrice des catécholamines