fibrillation


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Related to fibrillation: ventricular fibrillation

fibrillation

 [fi″brĭ-la´shun]
1. a small, local, involuntary, muscular contraction, due to spontaneous activation of single muscle cells or muscle fibers.
2. the quality of being made up of fibrils.
3. the initial degenerative changes in osteoarthritis, marked by softening of the articular cartilage and development of vertical clefts between groups of cartilage cells.
Fibrillation on an electrocardiographic tracing. From Fenstermacher and Hudson, 1995.
atrial fibrillation a reentrant cardiac arrhythmia marked by rapid randomized contractions of the atrial myocardium, causing a totally irregular rapid atrial rate. It is recognizable on an electrocardiogram by the absence of P waves and an irregular ventricular response. It may be controlled by drug therapy or cardioversion.
ventricular fibrillation a cardiac arrhythmia marked by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers with ineffectual ventricular contraction; on the surface electrocardiogram it is characterized by lack of identifiable QRS complexes. This is a frequent cause of cardiac arrest. An apparatus called a defibrillator is used to alleviate it by delivering an electric shock to the heart muscle; this depolarizes the myocardium and ends the irregular contractions so that the heart can resume normal, regular contractions.

fi·bril·la·tion

(fī-bri-lā'shŭn, fib-rĭ-),
1. The condition of being fibrillated.
2. The formation of fibrils.
3. Exceedingly rapid contractions or twitching of muscular fibrils, but not of the muscle as a whole.
4. Vermicular twitching, usually slow, of individual muscular fibers; commonly occurs in atria or ventricles of the heart as well as in recently denervated skeletal muscle fibers.

fibrillation

/fi·bril·la·tion/ (fĭ″brĭ-la´shun)
1. the quality of being made up of fibrils.
2. a small, local, involuntary, muscular contraction, due to spontaneous activation of single muscle cells or muscle fibers whose nerve supply has been damaged or cut off.
3. the initial degenerative changes in osteoarthritis, marked by softening of the articular cartilage and development of vertical clefts between groups of cartilage cells.

atrial fibrillation  atrial arrhythmia marked by rapid randomized contractions of small areas of the atrial myocardium, causing a totally irregular, and often rapid, ventricular rate.
ventricular fibrillation  cardiac arrhythmia marked by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated ventricular contraction and by absence of atrial activity.

fibrillation

(fĭb′rə-lā′shən, fī′brə-)
n.
1. The forming of fibers.
2.
a. Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole.
b. Rapid uncoordinated twitching movements that replace the normal rhythmic contraction of the heart and may cause a lack of circulation and pulse.

fibrillation

[fī′brilā′shən]
Etymology: L, fibrilla, small fiber, atio, process
involuntary recurrent contraction of a single muscle fiber or of an isolated bundle of nerve fibers. Fibrillation of a chamber of the heart results in inefficient random contraction of that chamber and disruption of the normal sinus rhythm of the heart. Fibrillation is usually described by the part that is contracting abnormally, such as atrial fibrillation or ventricular fibrillation.

fibrillation

Cardiology Unsynchronized random and continuously changing electrical activity in the myocardium, causing inefficient pumping of blood. See Atrial fibrillation, Ventricular fibrillation.

fi·bril·la·tion

(fib'ri-lā'shŭn, fī'bri-)
1. The condition of being fibrillated.
2. The formation of fibrils.
3. Exceedingly rapid contractions or twitching of muscular fibrils, but not of the muscle as a whole.
4. Vermicular twitching, usually slow, of individual muscular fibers; commonly occurs in atria or ventricles of the heart as well as in recently denervated skeletal muscle fibers.

fibrillation

Uncontrolled, rapid and irregular contraction of muscle, especially heart muscle. Fibrillation most commonly affects the upper chambers of the heart (atrial fibrillation) causing an irregular pulse. Fibrillation of the main pumping chambers (ventricular fibrillation) prevents pumping and is rapidly fatal unless normal beating can be restored by electrical defibrillation.

fibrillation

or

ventricular fibrillation

very rapid, irregular contractions of the ventricular muscle of the HEART that cause blood circulation to stop immediately. Under suitable circumstances, ventricular fibrillation can be stopped by passing an electric current through the heart, using a cardiac defibrillator.

Fibrillation

Rapid, uncoordinated contractions of the upper or the lower chambers of the heart.

fibrillation

unco-ordinated contraction of muscle, referring usually to heart muscle. atrial fibrillation chaotic atrial rhythm with irregular transmission to the ventricles, causing irregular heart beat. ventricular fibrillation ineffective ventricular activity with failure of cardiac output. A common cause of sudden death following myocardial infarction.

fibrillation

fine, rapid contractions (twitching) of individual or groups of skeletal or cardiac muscle fibres
  • atrial fibrillation pathological replacement of normal atrial contraction by rapid, irregular twitching of atrial wall muscle tissue, with associated irregular ventricular contraction, reduced cardiac output, resultant breathlessness and reduced general tissue perfusion

  • ventricular fibrillation pathological replacement of normal ventricular contraction by fine, rapid, irregular fibrillation of ventricle wall muscle tissue, with associated irregular and ineffective ventricular contraction, reduced cardiac output, breathlessness and reduced general tissue perfusion

fibrillation (fī·br·lāˑ·shn),

n rapid localized contraction of a nerve fiber bundle or a solitary muscle fiber.

fi·bril·la·tion

(fib'ri-lā'shŭn)
1. The condition of being fibrillated.
2. The formation of fibrils.
3. Exceedingly rapid contractions or twitching of muscular fibrils.

fibrillation (fib´rilā´shən),

n a local quivering of muscle fibers.
fibrillation, atrial,
n a cardiac arrhythmia caused by disturbed spread of excitation through atrial musculature.
Ibrillation, auricular
n an uncoordinated, independent contraction of the heart that results in marked irregularity of heart action.
fibrillation, ventricular,
n an uncoordinated, independent contraction of the ventricular musculature resulting in cessation of cardiac output.

fibrillation

1. a small, local, involuntary, muscular contraction, due to spontaneous activation of single muscle cells or muscle fibers.
2. the quality of being made up of fibrils.
3. the initial degenerative changes in osteoarthritis, marked by softening of the articular cartilage and development of vertical clefts between groups of cartilage cells.

atrial fibrillation
a cardiac arrhythmia marked by rapid randomized contractions of the atrial myocardium, causing a totally irregular, often rapid, ventricular rate. There is no synchronous atrial contraction and the ventricles beat irregularly. The heartbeat is irregular, the pulse is irregular in rhythm and amplitude. Common in the horse; an affected animal can still race but the performance is poor. Occurs in dogs in association with cardiac disease, particularly idiopathic congestive cardiomyopathy, and electrolyte disturbances.
ventricular fibrillation
a cardiac arrhythmia marked by fibrillatory contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated ventricular contraction. Ventricular fibrillation is a frequent cause of cardiac arrest. An apparatus called a defibrillator sometimes is used to alleviate fibrillation. The defibrillator delivers an electric shock to the heart muscle, depolarizing the muscle and ending the irregular contractions. The heart is then able to resume normal, regular contractions.
References in periodicals archive ?
TechNavio's report highlights that the Global Atrial Fibrillation market is witnessing a shift towards the newer and more economical drugs and treatments.
7% developed atrial fibrillation over the course of the study.
Conclusions from the analysis included: 1) Gencaro produced substantial prevention of atrial fibrillation in the entire BEST population, with a risk reduction of 41%; 2) the risk reduction for new onset atrial fibrillation was pharmacogenetically determined, with patients who were homozygous arginine at beta-1 389 having a 74% risk reduction and patients having any glycine at this position having no effect.
After researchers adjusted for potential confounding risk factors, those women in the top quartile for von Willebrand factor levels were at fivefold greater risk of having atrial fibrillation than were those women in the lowest quartile.
The findings include data on 1,244 people enrolled in 15 medical centers nationwide who showed sporadic or constant atrial fibrillation.
These statements include, but are not limited to, statements regarding the adequacy of the Company's capital to support the Company's operations, the ability of genetic variations to predict individual patient response to Gencaro; the potential for Gencaro to be the first genetically-targeted heart failure and/or atrial fibrillation prevention treatment; the projected increase in prevalence of atrial fibrillation; the projected increase in the size of the atrial fibrillation drug market in developed countries; and, the potential for the planned atrial fibrillation clinical trial provide important data on the safety and efficacy of Gencaro in the trial population.
They emphasized that prophylaxis for atrial fibrillation after lung resection is an unlabeled indication for amiodarone.
The report provides an analysis of the global atrial fibrillation market.
In patients who have paroxysmal atrial fibrillation, is the risk of stroke as high as it is in patients who have sustained atrial fibrillation, therefore necessitating anticoagulation?
These statements include, but are not limited to, statements regarding the ability of genetic variations to predict individual patient response to Gencaro; the potential for Gencaro to be the first genetically-targeted heart failure and/or atrial fibrillation prevention treatment; the projected increase in prevalence of atrial fibrillation; the projected increase in the size of the atrial fibrillation drug market in developed countries; and, the potential for the planned atrial fibrillation clinical trial provide important data on the safety and efficacy of Gencaro in the trial population.
5 Treatment Options and Management in Atrial Fibrillation 17