fibrillation

(redirected from auricular Ibrillation)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

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.