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Topic: Atrial fibrillation


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In the News (Tue 21 May 19)

  
  MedlinePlus Medical Encyclopedia: Atrial fibrillation/flutter
In atrial fibrillation and flutter, the atria are stimulated to contract very quickly and differently from the normal activity originating from the sinoatrial node.
Underlying causes of atrial fibrillation and flutter include dysfunction of the sinus node (the "natural pacemaker" of the heart) and a number of heart and lung disorders, including coronary artery disease, rheumatic heart disease, mitral valve disorders, pericarditis, and others.
Some patients with atrial fibrillation and rapid heart rates may need the radiofrequency ablation done not on the atria, but directly on the AV junction (i.e., the area that normally filters the impulses coming from the atria before they proceed to the ventricles).
www.nlm.nih.gov /medlineplus/ency/article/000184.htm   (876 words)

  
  Atrial fibrillation - Wikipedia, the free encyclopedia
Atrial fibrillation (AF or afib) is a cardiac arrhythmia (an abnormality of heart rate or rhythm) originating in the atria.
Atrial fibrillation is usually accompanied by symptoms related to either the rapid heart rate or embolization.
In atrial fibrillation, the regular impulses produced by the sinus node to provide rhythmic contraction of the heart are overwhelmed by the rapid randomly generated discharges produced by larger areas of atrial tissue.
en.wikipedia.org /wiki/Atrial_fibrillation   (1753 words)

  
 Atrial Fibrillation
The hemodynamic consequences of artial fibrillation are due to two factors:(1)the loss of atrial systole may impair ventricular function in the noncompliant ventricle(e.g.,aortic stenosis,left ventricular hypertrophy) or the dilated ventricle with systolic dysfunction and (2) a rapid ventricular rate encroaches upon diastolic filling of the left ventricle and the coronary arteries.
Atrial fibrillation is an arrhythmia, characterized by grossly disorganized atrial electrical activity, which is irregular in respect to both rate and rhythm (see figures 14, 15a, 15b).
Atrial fibrillation may be minimally symptomatic to asymptomatic, or associated with fatigue, palpitations, nonspecific symptoms, reduced quality of life, reduced memory in elder patients, acute pulmonary edema (lungs full of fluid with severe shortness of breath) occurring in mitral stenosis or aortic stenosis.
www.rjmatthewsmd.com /Definitions/atrial_fibrillation.htm   (3010 words)

  
 Atrial Fibrillation & Flutter
Atrial Fibrillation (also called AF or A Fib) is a common heart rhythm disorder caused by a problem in the conduction of electrical impulses in the upper chambers, or atria, of the heart.
Atrial fibrillation may occur from time-to-time, or it may be a permanent condition.
This ECG is of a patient with atrial fibrillation.
www.hrspatients.org /patients/heart_disorders/atrial_fibrillation   (596 words)

  
 Atrial fibrillation: Just the facts...   (Site not responding. Last check: 2007-10-29)
Atrial fibrillation (AF or AFib) is a cardiac arrhythmia (An abnormal rate of muscle contractions in the heart) (an abnormality of heart rate or rhythm) originating in the atria (additional info and facts about atria).
Atrial fibrillation may be asymptomatic, and be discovered as a chance finding during a health checkup.
Instead, all tissue of the atrium discharges spontaneously, randomly generating an electrical impulse that is powerful enough to lead to conduction of the bundle of His (A bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contract) and contraction of the ventricles.
www.absoluteastronomy.com /encyclopedia/a/at/atrial_fibrillation.htm   (1576 words)

  
 Atrial Fibrillation
Atrial fibrillation is a condition in which the regular pumping function of the atria is replaced by a disorganized, ineffective quivering caused by chaotic conduction of electrical signals through the upper chambers of the heart.
Atrial fibrillation is often associated with other forms of cardiovascular disease, including one or more of the following: congestive heart failure, rheumatic heart disease, coronary artery disease, left ventricular hypertrophy, cardiomyopathy and hypertension.
Less invasive treatments of atrial fibrillation include permanent destruction of the AV node by catheter ablation accompanied by implantation of a pacemaker, a procedure generally reserved for symptomatic individuals experiencing prolonged or chronic episodes of atrial fibrillation where control of the ventricular rate is the primary objective.
www.medical-library.net /sites/_atrial_fibrillation.html   (1221 words)

  
 Why Treat Atrial Fibrillation - afibfacts.com
Patients who have atrial fibrillation are susceptible to conditions related to oxygen deficiencies and other heart diseases such as:
During atrial fibrillation the pumping mechanism of the atrial and ventricular chambers is impaired.
One of the most dangerous aspects of atrial fibrillation is the increased risk of stroke.
www.afibfacts.com /Why_Treat_Atrial_Fibrillation   (557 words)

  
 Atrial Fibrillation Page]
Adrenergic AF is another type of neurogenic atrial fibrillation that occurs as a result of excessive adrenaline that comes from stimulation of the sympathetic portion ("fight or flight"response) of the nervous system.
Atrial defibrillators are about the size of a conventional pacemaker and consist of a small battery pack, a generator, and three leads.
The Maze procedure is a surgical intervention that cures atrial fibrillation (AF) by interrupting the circular electrical patterns or wavelets that are responsible for this arrhythmia.
www.angelfire.com /az/cardiosv/af1.html   (3062 words)

  
 pulmonary vein isolation ablation, afib, flutter, atrial fibrillation
Atrial fibrillation is the most common irregular heart rhythm in the United States.
Atrial fibrillation is an abnormal heart rhythm originating in the atria.
During surgical procedures to treat atrial fibrillation, the left atrial appendage may be removed and the tissue is closed with a special stapling device.
clevelandclinic.org /heartcenter/pub/guide/disease/electric/afib.htm   (2429 words)

  
 UpToDate Patient information: Atrial fibrillation
These rapid impulses result in chaotic contractions of the atrial muscle, described as "quivering" or "worm-like." Thus, instead of a forceful single contraction of the atria seen during normal sinus rhythm, the rapid contractions of atrial fibrillation are weak, resulting in the ejection of only a small amount of blood.
Patients with atrial fibrillation that is not due to valve disease or to a reversible disease (eg, hyperthyroidism, cardiac surgery) often have predisposing factors for embolism even when they are in normal sinus rhythm.
Likelihood of spontaneous conversion of atrial fibrillation to sinus rhythm.
patients.uptodate.com /topic.asp?file=hrt_dis/4882   (3815 words)

  
 Atrial fibrillation
Some people with atrial fibrillation have no symptoms and are unaware of their condition until their doctor discovers it during a physical examination.
The risk of stroke in atrial fibrillation depends on your age (you have a higher risk as you age), on whether you have high blood pressure, a history of heart failure or a previous stroke, and other factors.
Atrial fibrillation alone may weaken the heart, leading to heart failure — a condition in which your heart can't circulate enough blood to meet your body's needs.
www.cnn.com /HEALTH/library/DS/00291.html   (1994 words)

  
 Atrial Fibrillation and Stroke
Atrial fibrillation is a rapid uncoordinated generation of electrical impulses by the atria of the heart.
At times, atrial fibrillation can be treated and the heart rhythm returned to normal, but many times this is not possible and a patient is left with chronic atrial fibrillation.
The majority of atrial fibrillation cases occur during the ages of 55 to 85.
www.loftusmd.com /Articles/stroke/atrialfibrillation.html   (481 words)

  
 Atrial Fibrillation
Atrial fibrillation is the most common abnormal heart rhythm in older people.
Atrial fibrillation often causes a sensation of pounding or fluttering in the chest.
Atrial fibrillation is often associated with a variety of diseases affecting the atria - coronary heart disease, hypertension, mitral valve prolapse, congestive heart failure, rheumatic heart disease, cardiomyopathy, congenital atrial malformations, and metabolic diseases.
www.txai.org /edu/irregular/atrial_fibrillation.htm   (1431 words)

  
 atrial fibrillation
Atrial myxomas are most often found on the left side of the heart and are attached to the septum that divides the atria.
This being said, cardiac surgery in general and surgery which involves the atrial septum (including operations the repair holes in the septum) are associated with atrial fibrillation (see a representative electrocardiogram) and atrial flutter.
Theoretically it should increase the chance of atrial fibrillation as it decreases the refractory period of the atrium, and secondly it slows the conduction of the fibrillation to the bottom of the heart.
sprojects.mmi.mcgill.ca /heart/wellaf.html   (3658 words)

  
 Paroxysmal (Lone) Atrial Fibrillation - FAQs
Atrial fibrillation basically involves a chaotic movement of electrical impulses across the atria and leads to a loss of synchrony between the atria and the ventricles.
Atrial fibrillation in itself is not a disease, but rather a symptom of some other disorder of the body.
Medical intervention in lone atrial fibrillation is aimed at preventing episodes, ameliorating the symptoms of episodes, converting the fibrillation to normal sinus rhythm (NSR), and reducing the risk of stroke.
www.afibbers.org /faq.htm   (2118 words)

  
 Atrial Fibrillation -- familydoctor.org   (Site not responding. Last check: 2007-10-29)
Atrial fibrillation (say: ay-tree-all fib-rill-ay-shun) is an irregular heartbeat that may be very fast.
Atrial fibrillation is most common in people older than 60 years of age.
If the fibrillation is new and you are having lots of symptoms, your doctor may decide to treat you with electrical cardioversion (say: kar-dee-oh-ver-shun).
familydoctor.org /775.xml   (546 words)

  
 HeartPoint: AFib, Tell me more
Atrial fibrillation in this case, as well as in the case of mitral valve disease, can be an important cause of worsening of a patient's condition.
This may be the cause of "lone atrial fibrillation" in many cases, and could account for many of the cases currently termed "idiopathic".
In such cases, the atrium is left in atrial fibrillation and the AV Node is "ablated" (a small amount of tissue is destroyed) using radio frequency delivered from a catheter.
www.heartpoint.com /afib-tellme.html   (4174 words)

  
 Atrial fibrillation - MayoClinic.com
Atrial fibrillation is a common heart rhythm problem.
Atrial fibrillation is often caused by changes in your heart that occur with age or as a result of heart disease or high blood pressure.
Atrial fibrillation may be a sporadic condition, or it may be chronic.
www.mayoclinic.com /health/atrial-fibrillation/DS00291   (265 words)

  
 Information on atrial fibrillation (abnormality in the heart rhythm) produced by medical doctors
Atrial fibrillation (AF) is the most common, abnormal rhythm of the heart.
In a normal heart, the rate of atrial contraction is the same as the rate of ventricular contraction.
The rate of ventricular contraction in AF is determined by the speed of transmission of the atrial electrical discharges through the AV node.
www.medicinenet.com /atrial_fibrillation/article.htm   (1239 words)

  
 AllRefer Health - Atrial Fibrillation/Flutter (A-Fib, Auricular Fibrillation)
Atrial fibrillation/flutter is a disorder of heart rhythm (arrthymia) usually with rapid heart rate in which the upper heart chambers (atria) are stimulated to contract in a very disorganized and abnormal manner.
Arrhythmias are caused by a disruption of the normal functioning of the electrical conduction system of the heart.
Some cases of atrial fibrillation or flutter occur in the setting of a heart attack (myocardial infarction) or soon after surgery on the heart.
health.allrefer.com /health/atrial-fibrillation-flutter-info.html   (559 words)

  
 Atrial Fibrillation Centre
Atrial Fibrillation (AF) is the most common, abnormal rhythm of the heart.
The London Atrial Fibrillation Centre comprises a team of dedicated healthcare professionals based mainly in The London Bridge Hospital in central London, who have international recognition in the field of treatment and research into atrial fibrillation (AF).
By establishing a pedigree in both AF management and research we are able to offer "cutting-edge" treatments for Atrial Fibrillation and make management decisions based on opinions informed by the latest scientific data.
www.londonafcentre.co.uk   (238 words)

  
 eMedicine - Atrial Fibrillation : Article by Jeffrey Lazar
Atrial fibrillation (AF), the most commonly encountered arrhythmia in clinical practice, is defined by the absence of coordinated atrial systole.
The rate at which the atrial electrical impulses are transmitted to the ventricle is determined by a number of factors including relative refractory period within the atrioventricular (AV) node, hydration status, and presence or absence of pharmacologic agents used to control the rate.
Atrial fibrillation can be considered a disease of aging, and with the projected increase in the elderly population in America, the prevalence is expected to more than double by the year 2050.
www.emedicine.com /EMERG/topic46.htm   (9114 words)

  
 Artial Heart Fibrillation : Atrial Fibrillation Drug, Type Atrial Fibrillation, Atrial Fibrillation : FurtherHealth.com
The term Atrial Fibrillation (AF) describes one of a number of common types of irregular heart rhythms.
Atrial fibrillation is caused by electrical problems in the atria
Thus, in Atrial Fibrillation, the heart is pumping the blood around the body in a weak and ineffective manner.
www.furtherhealth.com /article/13_1_Atrial-Fibrillation   (346 words)

  
 Atrial Fibrillation - CardiologyChannel
Atrial fibrillation is an abnormality of heart rhythm in which chambers of the heart contract in a disorganized manner, producing an irregular heart rate.
Atrial fibrillation can lead to heart failure (shortness of breath, edema, palpitations) and chest pains and, when left untreated, can lead to stroke.
First, because less blood is pumped into the ventricles, there is less blood circulating throughout the body and blood accumulates in the lungs, causing shortness of breath (dyspnea) and other symptoms of heart failure.
www.cardiologychannel.com /afib   (774 words)

  
 Treatment Options for Atrial Fibrillation - afibfacts.com
Your prognosis should be based on a precise diagnosis of the incidence and classification of your atrial fibrillation.
The long-term outcome of patients with coronary disease and atrial fibrillation undergoing the Cox-Maze procedure.
Surgical ablation of atrial fibrillation with bipolar radiofrequency as the primary modality.
www.afibfacts.com /Treatment_Options_for_Atrial_Fibrillation   (1003 words)

  
 Atrial Fibrillation
Atrial fibrillation is a disorder found in about 2.2 million Americans. During atrial fibrillation, the heart's two small upper chambers (the atria) quiver instead of beating effectively.
The likelihood of developing atrial fibrillation increases with age. Three to five percent of people over 65 have atrial fibrillation.
Atrial pacemakers can be implanted under the skin to regulate the heart rhythm.
www.americanheart.org /presenter.jhtml?identifier=4451   (539 words)

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