vasoconstriction

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Related to Vasoconstrictors: Vasodilators, epinephrine

vasoconstriction

 [vas″o-kon-strik´shun]
decrease in the caliber of blood vessels. adj., adj vasoconstric´tive.

va·so·con·stric·tion

(vā'sō-kon-strik'shŭn, vas'ō-),
Narrowing of the blood vessels.

vasoconstriction

/vaso·con·stric·tion/ (-kon-strik´shun) decrease in the caliber of blood vessels.vasoconstric´tive

vasoconstriction

(vā′zō-kən-strĭk′shən)
n.
Constriction of a blood vessel, as by a nerve or drug.

vas′o·con·stric′tive adj.

vasoconstriction

Etymology: L, vas + constrigere, to tighten
a decrease in the diameter of a blood vessel. It plays an important role in the control of blood pressure and the distribution of blood throughout the body. Vasoconstriction is triggered by stimulation of the vasomotor constriction center in the medulla. Impulses from this center travel along sympathetic nerve fibers and cause contraction of the smooth muscle layers of arteries, arterioles, and, to a lesser extent, venules, and veins, bringing about constriction of these vessels. Vasoconstriction is also induced by vasomotor pressure reflexes, chemical reflexes, the medullary ischemic reflex, and impulses from the cerebral cortex and the hypothalamus. Compare vasodilation. vasoconstrictive, adj.

va·so·con·stric·tion

(vā'sō-kŏn-strik'shŭn)
Reduction in the caliber of a blood vessel due to contraction of smooth muscle fibers in the tunica media leading to decreased blood flow to a part.

vasoconstriction

Active narrowing of small arteries as a result of contraction of the circular smooth muscle fibres in their walls. This severely reduces the flow of blood through them. Compare VASODILATATION.

vasoconstriction

a narrowing of the blood vessels, often in response to cold, which occurs through a contraction of INVOLUNTARY muscles in the walls of the vessels brought about by a stimulus from the sympathetic nervous system (see AUTONOMIC NERVOUS SYSTEM).

Vasoconstriction

Constriction of a blood vessel.
Mentioned in: Induction of Labor

vasoconstriction

narrowing of the lumen of a blood vessel, due to contraction of the smooth muscle in its wall, mediated by neural (autonomic) control, local or blood-borne chemical factors, or fall in temperature. Part of the rationale for the use of ice in acute injury to minimize blood flow (and therefore swelling) in the damaged tissue.

vasoconstriction (vāˈ·zō·kn·strikˑ·shn),

n state of constriction or narrowing of a blood vessel.

va·so·con·stric·tion

(vā'sō-kŏn-strik'shŭn)
Narrowing of blood vessels.

vasoconstriction

decrease in the caliber of blood vessels; may be general or local, e.g. pulmonary, peripheral.
References in periodicals archive ?
1] Bipolar diathermy, packing, local vasoconstrictor and induced hypotension are the most commonly used techniques.
For using local anesthesia with vasoconstrictor, 54% said it was safe to use during pregnancy, 30.
Both sVCAM-1 and TBARS associated positively to SOFA score, and increased TBARS levels were associated with increased requirements for intravenous fluids for resuscitation and an increased number of days on vasoconstrictors.
noted that patients with serum creatinine > 7 mg/dl are less likely to respond to vasoconstrictor therapy.
laevifrons have muscarinic receptors type 1 and 3 with one muscarinic receptor having a high sensitivity that could be located in the endothelium coupled to COX that produce a prostanoid vasoconstrictor, and another muscarinic receptor having a low sensitivity located in the vascular smooth muscle.
It is difficult to answer why the further reduction of blood flow by the vasoconstrictor drugs like terlipressin shifts the waveform towards normal.
Most vasoconstrictors are indicated for treatment of acute bleeding, whereas nonselective beta-blockers help as primary prophylaxis and in the prevention of rebleeding.
The observed beneficial effects of the EGb 761 may be attributed to different factors, including ACE inhibition and maintenance of cellular antioxidant capacity as well as preserving vascular reactivity towards endothelium-dependent and -independent vasodilators while inhibiting responses to vasoconstrictors.
Therefore, phentolamine mesylate has not been tested for efficacy following use of local anesthetic without added vasoconstrictors.
Endothelial dysfunction occurs when bioavailable vasoconstrictors outnumber vasodilators (e.