beta-blocker


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beta-blocker

or

beta-adrenergic blocking agent

(bā`tə ăd'rənûr`jĭk), drug that reduces the symptoms connected with hypertensionhypertension
or high blood pressure,
elevated blood pressure resulting from an increase in the amount of blood pumped by the heart or from increased resistance to the flow of blood through the small arterial blood vessels (arterioles).
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, cardiac arrhythmiasarrhythmia
, disturbance in the rate or rhythm of the heartbeat. Various arrhythmias can be symptoms of serious heart disorders; however, they are usually of no medical significance except in the presence of additional symptoms.
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, angina pectorisangina pectoris
, condition characterized by chest pain that occurs when the muscles of the heart receive an insufficient supply of oxygen. This results when the arteries that supply the heart muscle with oxygenated blood are narrowed by arteriosclerosis.
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, migrainemigraine
, headache characterized by recurrent attacks of severe pain, usually on one side of the head. It may be preceded by flashes or spots before the eyes or a ringing in the ears, and accompanied by double vision, nausea, vomiting, or dizziness.
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 headaches, and other disorders related to the sympathetic nervous systemnervous system,
network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system.
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. Beta-blockers also are sometimes given after heart attacks to stabilize the heartbeat. Within the sympathetic nervous system, beta-adrenergic receptors are located mainly in the heart, lungs, kidneys, and blood vessels. Beta-blockers compete with the nerve-stimulating hormone epinephrineepinephrine
, hormone important to the body's metabolism, also known as adrenaline. Epinephrine, a catecholamine, together with norepinephrine, is secreted principally by the medulla of the adrenal gland.
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 for these receptor sites and thus interfere with the action of epinephrine, lowering blood pressure and heart rate, stopping arrhythmias, and preventing migraine headaches. Because it is also epinephrine that prepares the body for "fight or flight" in stressful or fearful situations, beta-blockers are sometimes used as antianxiety drugsantianxiety drug,
drug administered for the relief of anxiety. Although their action is not fully understood, most antianxiety medications appear to affect the action of neurotransmitters in the brain (see serotonin and norepinephrine).
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, especially for stage fright and the like. People taking a beta-blocker must avoid caffeine, alcohol, and salty foods, because the interaction of those substances and the drug can raise the heart rate and blood pressure. Propranolol (Inderal) is a commonly used beta-blocker.

beta-blocker

Medicine any of a class of drugs, such as propranolol, that inhibit the activity of the nerves that are stimulated by adrenaline; they therefore decrease the contraction and speed of the heart: used in the treatment of high blood pressure and angina pectoris
References in periodicals archive ?
This should reassure clinicians, particularly for patients with another indication for beta-blockers, such as MI or the need for rate control of rapid AF with ongoing symptoms," he added.
The rate of effective perioperative beta-blockade (the primary outcome) was assessed in the patients who met our definition of perioperative beta-blockade (at least one dose of beta-blocker administered anytime before or soon after induction of anaesthesia, as well as a prescription for beta-blocker for the duration of hospital admission).
Patients on beta-blockers were significantly older (51 years vs.
Bone-building drugs to treat osteoporosis represent a major unmet medical need and a major market opportunity for OsteoCorp's bone beta-blockers.
In the MRC trial, whenever a beta-blocker was added to the diuretic, the benefits of diuretic therapy were substantially diminished and became completely nonsignificant with beta-blocker monotherapy (1).
from the University of Colorado Anschutz Medical Campus, an electrophysiologist-cardiologist and a co-author on the paper, said: "While the use of beta-blockers as a class of drugs for prevention of ventricular arrhythmias is not well studied, it is commonly thought that any beta-blocker is potentially helpful for any at-risk patient.
However, in a kidney disease patient without heart failure, there may be other blood pressure--lowering medications to try first before you try a beta-blocker.
Washington, Jan 20 (ANI): A new study has shown that beta-blockers in combination with certain anti-hypertensive drugs can significantly reduce blood pressure in hypertension patients.
Re-examining the efficacy of beta-blockers for the treatment of hypertension: a meta-analysis.
One of the most important risk factors for developing new-onset diabetes was being allocated to the beta-blocker plus or minus diuretic treatment strategy," Dr Ajay Gupta of the International Centre for Circulatory Health, Imperial College London, UK, said.
NICE recommends: "If you are taking a beta-blocker you should continue taking it.
263) states that a generic beta-blocker, when administered to patients who have suffered severe injury, was shown to reduce the common muscle-wasting condition known as hypermetabolism.

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