Norepinephrine

norepinephrine /nor·epi·neph·rine/ (-ep-i-nef´rin) a catecholamine, which is the principal neurotransmitter of postganglionic adrenergic neurons, having predominant a-adrenergic activity; also secreted by the adrenal medulla in response to splanchnic stimulation, being released predominantly in response to hypotension. It is a powerful vasopressor and is used, in the form of the bitartrate salt, to restore the blood pressure in certain cases of acute hypotension and to improve cardiac function during decompensation associated with congestive heart failure or cardiovascular surgery.

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nor·ep·i·neph·rine (nôrp--nfrn)

n.

A substance, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. Also called levarterenol, noradrenalin.

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Norepinephrine

Norepinephrine is a hormone secreted by certain nerve endings of the sympathetic nervous system, and by the medulla (center) of the adrenal glands. Its primary function is to help maintain a constant blood pressure by stimulating certain blood vessels to constrict when the blood pressure falls below normal.

Mentioned in: Antidepressant Drugs, SSRI, Catecholamines Tests, Shy-Drager Syndrome, Weight Loss Drugs

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norepinephrine (nōrˈ·ep·i·nefˑ·rin),

n a neurotransmitter released by the adrenal gland; part of the fight-or-flight response and also directly increases heart rate, blood pressure, energy release from fat, and muscle readiness.

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norepinephrine (nôr´epinef´rin),

n the neurohormonal transmitter for neuroeffector junctions of adrenergic nerve fibers. Its official drug name in the United States is levarterenol. See also levarterenol.

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norepinephrine

a catecholamine which is the neurotransmitter of most sympathetic postganglionic neurons and also of certain tracts in the central nervous system. It is also a neurohormone stored in the chromaffin granules of the adrenal medulla and released in response to sympathetic stimulation, primarily in response to hypotension. It produces vasoconstriction, an increase in heart rate, and elevation of blood pressure. It is used as a vasopressor, administered by intravenous infusion, to restore blood pressure in certain cases of acute hypotension and as an adjunct in the treatment of cardiac arrest. Called also norepinephrine.