What's the difference between pressor and vasoconstrictor?
Pressor
Definition:
(a.) Causing, or giving rise to, pressure or to an increase of pressure; as, pressor nerve fibers, stimulation of which excites the vasomotor center, thus causing a stronger contraction of the arteries and consequently an increase of the arterial blood pressure; -- opposed to depressor.
Example Sentences:
(1) In telecost fishes, the corpuscles of Stannius contain Bowie-stainable granules and a renin-like pressor substance.
(2) Concerning the descending influences, it was found that stimulation of the anterior hypothalamus evokes depressor reactions, whereas stimulation of the posterior hypothalamus results in pressor reactions.
(3) The pressor effect induced by the kinin antagonist suggests that kinins may contribute to the regulation of blood pressure.
(4) Trimazosin at the dose used and under the conditions of study did not reverse the peripheral pressor effect of angiotensin II or B-HT920 but at higher concentrations, unlike prazosin, it relaxed the K+ contracted thoracic aorta.
(5) Lysine vasopressin was maximally antidiuretic in the absence of a significant pressor effect at a dose of 2.5 pmol h-1 100 g body weight-1.
(6) The possibility that the pressor effects of angiotensin II influence angiotensin-induced thirst was investigated in dogs pretreated with hexamethonium.
(7) Single shocks applied to medullary pressor sites evoked a train of spikes in the interneurons.
(8) Finally, fosinopril had no effect on the pressor or chronotropic effects of norepinephrine (NE) or 1,1-dimethyl-4-phenylpiperinium (DMPP) or electrical stimulation of the sympathetic ganglia of pithed rats.
(9) It was found that within the dorsal part of the well known pressor area there is a narrow strip, 2.5 mm lateral from the mid line, starting ventral to the inferior colliculus and ending in the medulla close to the floor of the IV ventricle, from which vasodilatation in skeletal muscles is selectively obtained.
(10) The present study, which fails to show augmented synthesis of PGs by renal tissues derived from gravid rats, is consistent with our previous investigation in which cyclooxygenase inhibition did not reduce the gestational increase of renal hemodynamics or restore the attenuated renal pressor responsiveness to exogenous angiotensin II.
(11) Diminished pressor responsiveness was considered to be due to concurrent reduction of central sympathetic vasomotor activity, because sympathetic nerve responses to hypothalamic stimulation were appreciably lessened in tripamide-treated SHR.
(12) Furthermore, this study demonstrates that the AV3V region is necessary for vasopressin-dependent pressor responses caused by an osmotic stimulus.
(13) However, the pressor response to the stressors was greater in ICI 118,551- than vehicle-treated F1, but the tachycardia was equivalent for both groups.
(14) The pacemaker remained responsive one year after implant, increasing rate during exercise, cold pressor stress, ischemia of the arms and emotional stress.
(15) To try to compare receptor compartment kinetics, receptor binding, and binding-response coupling for two smooth muscle types in vivo, pressor and uterine responses to oxypressin, an equipotent analog of oxytocin and vasopressin, were studied simultaneously in urethane-anesthetized, pentolinium-indomethacin treated rats.
(16) In contrast, in AP-lesioned dogs, AVPX alone substantially reduced the pressor response to BVB.
(17) Change of 5-hydroxytryptamine (5-HT) concentrations in platelets from patients with chronic tension-type headache (TH) and controls were observed during cold pressor test (CPT).
(18) However, unlike the HS response, the pressor effect to HG returned to base line within approximately 5 min during a 10-min infusion.
(19) In contrast, stimulus-induced pressor response of BP showed no consistent correlation to prestimulus BP.
(20) Microinjections of this agent into the VLPA prevented the pressor responses to subsequent microinjections of CD at the same sites, indicating that AFDX-116 blocked M2 receptors.
Vasoconstrictor
Definition:
(a.) Causing constriction of the blood vessels; as, the vasoconstrictor nerves, stimulation of which causes constriction of the blood vessels to which they go. These nerves are also called vasohypertonic.
(n.) A substance which causes constriction of the blood vessels. Such substances are used in medicine to raise blood pressure.
Example Sentences:
(1) With aging, the blood vessel wall becomes hyperreactive--presumably because of an augmented vasoconstrictor and a reduced vasodilator responsiveness.
(2) This suggests that there was a deterioration of the vasoconstrictor response and indicated a possible effect of heat at the receptor or effector level.
(3) We compared the effects of angiotensin II and endothelin on mass levels of 1,2-diacylglycerol, and endogenous activator of protein kinase C, in cultured rabbit vascular smooth muscle cells with the effects of these vasoconstrictors on contractile responses of rabbit aortic strips.
(4) Thus, the potent vasoconstrictor thromboxane A2 may play a role in the impairment of renal function and renal blood flow during acute allograft rejection.
(5) The coronary vasoconstrictor response produced by ibopamine was inhibited completely by the irreversible alpha-adrenoceptor antagonist, phenoxybenzamine, whereas the response produced by epinine was transformed into relaxation which was inhibited by the beta-adrenoceptor antagonist, propranolol.
(6) This agent is used in dentistry as a vasoconstrictor (Neo-Cobefrin) and although its pharmacologic activilty is weaker than that of (-) norepinephrine, it appears that this agent can have significant pharmacologic effects at higher doses.
(7) Vasoconstrictor responses in the rat tail artery to vasopressin, ATP and KCl, like those to alpha 1-adrenoceptor agonists, were enhanced by alpha 2-adrenoceptor agonists.2+owever, vasoconstrictor responses to
(8) To evaluate whether local anesthetic scalp infiltration blunts hemodynamic responses to craniotomy in anesthetized children (age, 2-18 yr), two concentrations of bupivacaine (0.125% and 0.25%) with vasoconstrictor (epinephrine 1:400,000) were compared with control data when a solution of vasoconstrictor alone was injected.
(9) In endothelium-denuded segments, vasoconstrictor responses to nerve stimulation (0.5 Hz, 10 s) or norepinephrine (10 ng) remained constant.
(10) Moreover, the mechanical denudation technique did not deleteriously affect smooth muscle because vasoconstrictor and vasodilator responses to nonendothelial-dependent drugs were the same before and after denudation.
(11) Following the administration of the alpha- and beta-adrenoceptor antagonists phenoxybenzamine and propranolol, the vasoconstrictor response to exogenous NA was reduced by 98%, whereas that of NPY was unaltered.
(12) Following the first report on the identification of endothelin (ET), an increasing body of work has accumulated on this endothelium-derived 21-amino acid vasoconstrictor peptide.
(13) Results of the present study indicate that MCT, by an unknown mechanism, causes an early and transient increase in pulmonary vascular responsiveness to some but not all vasoconstrictors.
(14) Considering the fact that EPA antagonizes LTC4-induced coronary constriction, it seems possible, that EPA might act as a functional antagonist of vasoconstrictor eicosanoids including EPA-derived SP-LT.
(15) Although caution must be advised in the extrapolation of this phenomenon, which was observed in a manipulated artery during coronary angioplasty, the vasoconstrictor response to intracoronary thrombus formation in vivo may play an important role in the dynamic mechanisms of acute coronary heart disease syndromes.
(16) The magnitude of the vasoconstrictor response appeared to be subject to seasonal variation.
(17) Comparable increase of afterload was achieved in heart transplant recipients with significantly (p less than 0.001) less angiotensin II, which indicates increased vasoconstrictor sensitivity.
(18) We conclude that atherosclerosis potentiates vasoconstrictor responses to serotonin and these abnormalities are reversible by dietary treatment of atherosclerosis.
(19) The inhibitory effect of atrial natriuretic peptide on the myotropic action of phenylephrine on superior mesenteric artery and thoracic aorta rings was studied to test the hypothesis that this peptide interferes with the mobilization of intra- or extra-cellular calcium produced by vasoconstrictor agents.
(20) Vasoconstrictor effects of norepinephrine (NE) and potassium chloride (K+) in the perfused central artery of the rabbit's ear and in perfused mesenteric arteries of cats were significantly inhibited by infusion with Krebs bicarbonate solution made hyperosmotic with mannitol (50-200 mosM increase).