catecholamines


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cat·e·chol·a·mines

(kat'ĕ-kol'ă-mēnz),
Pyrocatechols with an alkylamine side chain; examples of biochemical interest are epinephrine, norepinephrine, and l-dopa. Catecholamines are major elements in responses to stress.

cat·e·chol·a·mines

(kat'ĕ-kol'ă-mēnz)
Pyrocatechols with an alkylamine side chain; examples of biochemical interest are epinephrine, norepinephrine, and l-dopa. Catecholamines are major elements in responses to stress.

catecholamines

The group of AMINES, which includes adrenaline, noradrenaline, dopamine and chemically related amines. These are derived from the amino acid tyrosine, and act as neurotransmitters or hormones.

Catecholamines

Family of neurotransmitters containing dopamine, norepinephrine and epinephrine, produced and secreted by cells of the adrenal medulla in the brain. Catecholamines have excitatory effects on smooth muscle cells of the vessels that supply blood to the skin and mucous membranes and have inhibitory effects on smooth muscle cells located in the wall of the gut, the bronchial tree of the lungs, and the vessels that supply blood to skeletal muscle. There are two different main types of receptors for these neurotransmitters, called alpha and beta adrenergic receptors. The catecholamines are therefore are also known as adrenergic neurotransmitters.

catecholamines (kaˈ·t·kōˑ·l·mēnz),

n.pl a group of substances derived from tyrosine that act as hormones to stimulate cellular activity and carry nerve impulses through the body.
References in periodicals archive ?
After surgery, 24-hour urine examination is done for measuring fractionated catecholamines and metanephrines levels.
Some histologically proven adrenal pheochromocytomas are tumors that do not produce or secrete catecholamines and metanephrines.
These tumours usually get diagnosed late due to their low incidence and lack of catecholamine secretion.
While there are multiple methods available for the measurement of catecholamines, liquid chromatography (LC) coupled with tandem mass spectrometry remains the gold standard (Li 2014) for these and many other biological analytes (Grebe et al.
There are probably other neurohumoral agents secreted by the tumor chromaffin cells, such as neuropeptide Y, that can act synergistically with the catecholamines and worsen the myocardial injury and the patient's progress.
Such results may be due to the fact of catecholamines, as well as the presence of these self-inducers in the conditioned medium, induce cell multiplication (FREESTONE et al.
In this case, before the night of admission, the only symptoms were occasional palpitations, worsening over a period of several years, which in retrospect were always associated with increased abdominal pressure which apparently pushed on the tumor to secrete a surge of excess catecholamines.
Although different markers, including catecholamines and vanillylmandelic acid, are utilized as diagnostic tests, total and fractionated metanephrines in plasma or urine provide the best valid laboratory test for excluding or confirming pheochromocytoma.
Catecholamines are substances produced by nerve tissue including the brain and the inner part of the adrenal glands.
After a preoperative medical consult and adequate preoperative catecholamine blockade, the patient underwent bilateral open adrenal-ectomies with a chevron incision.
General physiological changes upon acute exposure to altitude include increased resting and sub-maximal heart rate (HR), increased resting and sub-maximal ventilation (VE), increased blood pressure (BP), increased catecholamine secretion, and decreased V[O.