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Topic: Fibrillation

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	Atrial fibrillation - Wikipedia, the free encyclopedia
		It is not uncommon to identify atrial fibrillation on a routine physical examination or electrocardiogram, as it may be asymptomatic in some cases.
		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.
		Because the diagnosis of atrial fibrillation requires measurement of the electrical activity of the heart, atrial fibrillation was not truly described until 1874, when Edmé Félix Alfred Vulpian observed the irregular atrial electrical behavior that he termed "fremissement fibrillaire" in dog hearts.
	en.wikipedia.org /wiki/Atrial_fibrillation (3096 words)

	Atrial fibrillation/flutter Encyclopedia Search - Drug Price Search
		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.
		In certain cases, atrial fibrillation may require emergency treatment to convert the arrhythmia to normal (sinus) rhythm, either with electrical cardioversion or with the administration of intravenous drugs, such as dofetilide or ibutilide.
		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.drug-price-search.com /encyclopedia/?encyclopedia_name_url=219&level=2 (795 words)

	Fibrillation - Wikipedia, the free encyclopedia
		Fibrillation is the rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart.
		There are two major classes of fibrillation, atrial fibrillation and ventricular fibrillation.
		Atrial fibrillation can be a chronic condition, usually treated with anticoagulation and sometimes with conversion to normal sinus rhythm.
	en.wikipedia.org /wiki/Fibrillation (125 words)

	* Atrial fibrillation - (Disease): Definition (Site not responding. Last check: 2007-10-30)
		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 causes a rapid and irregular heartbeat,...
		Atrial fibrillation is a risk factor for arterial embolism due to the release of blood clots from the fibrillating heart.
	www.en.mimi.hu /disease/atrial_fibrillation.html (517 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.
		Patients with this type of atrial fibrillation are frequently young with structurally normal hearts, have paroxymal episodes, and the EKG often often shows bursts of an atrial tachycardia or frequent premature atrial complexes, sometimes initiating the atrial fibrillation.
		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)

	Ventricular Fibrillation: Encyclopedia of Medicine
		Ventricular fibrillation is a very rapid, uncoordinated, ineffective series of contractions throughout the lower chambers of the heart.
		Ventricular fibrillation is often associated with acute ischemic events (ischemia involves the deprivation of oxygenated blood to an area of tissue), and with chronic ischemic heart disease.
		The diagnosis of ventricular fibrillation is confirmed with an electrocardiogram.
	health.enotes.com /medicine-encyclopedia/ventricular-fibrillation (500 words)

	Lone Atrial Fibrillation
		Fibrillation attack victims usually experience one or more of these symptoms, but a few patients are not aware of any symptoms at all until an electrocardiogram exposes their irregular heart rhythm(1-4).
		Atrial fibrillation may be chronic or intermittent (paroxysmal) and may be triggered by an underlying heart disease such as mitral valve prolapse or stenosis, coronary artery disease, hypertensive heart disease, a heart attack or an inflammation of the membrane surrounding the heart (pericarditis).
		Atrial fibrillation not caused by an underlying heart disease is referred to as primary or lone atrial fibrillation(3).
	www.yourhealthbase.com /atrial_fibrillation.html (2353 words)

	UpToDate Patient information: Atrial fibrillation
		Patients with atrial fibrillation who are overweight, or have a history snoring or excessive sleepiness during the daytime, should be evaluated with a sleep study.
		Patients with symptomatic atrial fibrillation that cannot be adequately controlled with medicines may be candidates for catheter ablation to cure the atrial fibrillation.
		Likelihood of spontaneous conversion of atrial fibrillation to sinus rhythm.
	patients.uptodate.com /topic.asp?file=hrt_dis/4882 (3593 words)

	MedlinePlus Medical Encyclopedia: Atrial fibrillation/flutter
		In certain cases, atrial fibrillation may require emergency treatment to convert the arrhythmia to normal (sinus) rhythm.
		Blood thinners, such as heparin or Coumadin, may be given to reduce the risk of a thromboembolic event such as a stroke.
		The natural tendency of atrial fibrillation, however, is to become a chronic condition.
	www.nlm.nih.gov /medlineplus/ency/article/000184.htm (895 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.
		In many people who have atrial fibrillation and an otherwise relatively normal heart, atrial fibrillation is caused by rapidly discharging triggers, or "hot spots." These hot spots are like abnormal pacemaker cells that fire so rapidly that the atria fibrillate.
	www.cnn.com /HEALTH/library/DS/00291.html (1987 words)

	Atrial Fibrillation -- familydoctor.org (Site not responding. Last check: 2007-10-30)
		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 (522 words)

	Atrial Fibrillation
		As the largest portion of the U.S. population ages, the prevalence of atrial fibrillation is expected to increase.
		Unfortunately, the prevalence of atrial fibrillation is expected to grow exponentially as the aged portion of the U.S. population expands.
		The estimated annual stroke risk for patients not on warfarin with atrial fibrillation and hypertension, diabetes mellitus, previous stroke or transient ischemic attack, coronary artery disease, or congestive heart failure is 6%.
	www.uspharmacist.com /oldformat.asp?url=newlook/files/Feat/Atrial.htm&pub_id=8&article_id=826 (3500 words)

	Understanding Atrial Fibrillation
		Atrial Fibrillation (Afib) is an arrhythmia, an irregularity of the heart’s rhythm.
		Atrial fibrillation can be paroxysmal (episodes come and go on their on), persistent (episodes come and last until you are put back into rhythm) or permanent (the heart stays in Afib despite efforts to convert into a normal rhythm).
		Although the rhythm of atrial fibrillation is not life threatening by itself, there is a 2-fold higher rate of death in patients with Afib compared to those without AFib.
	www.healthsystem.virginia.edu /Internet/afibcenter/whatis_afib.cfm (1076 words)

	Fibrillation, atrial definition - Heart Disease and other cardiovascular conditions on MedicineNet.com
		Fibrillation, atrial: An abnormal irregular heart rhythm whereby electrical signals are generated chaotically throughout the upper chambers (atria) of the heart.
		Although many persons with atrial fibrillation have no symptoms, the most common symptom is palpitations, an uncomfortable awareness of the rapid and irregular heartbeat.
		Treatment of atrial fibrillation involves controlling the risk factors, medications to slow the heart rate and/or convert the heart to normal rhythm, and preventing complications of blood clotting.
	www.medterms.com /script/main/art.asp?articlekey=3447 (150 words)

	Atrial Fibrillation
		Your heart also has a kind of internal wiring that begins in the atrium before going to the ventricle so that there is a sequence of the atrium pumping blood into the ventricle before the ventricle pumps blood to your lungs and the rest of your body.
		In atrial fibrillation, the atrium contracts in a disorganized and inefficient way and can also affect the conduction of electrical impulses to the ventricle; this may cause your heart to beat too fast.
		Blood can sometimes form clots in the fibrillating atrium, which can be life threatening if they find their way into your blood vessels, causing strokes or damage to your lungs.
	healthlink.mcw.edu /article/901288788.html (455 words)

	Atrial and Ventricular Fibrillation
		In atrial fibrillation, the atrial contractions are not synchronized and, therefore, are ineffective at contributing to ventricular filling.
		Contrary to atrial fibrillation, which is possible to live with, ventricular fibrillation is considerably more serious, leading to loss of consciousness wihtin seconds, and death if not treated immediately.
		Spontaneous resynchronization of the heart during ventricular fibrillation is rare; therefore, a strong, well-placed electrical shock to the heart will polarize all cells simultaneously, putting a halt to the fibrillation, and the SA node resumes it's role as the pacemaker.
	www.usc.edu /dept/biomed/bme403/Section_3/atrial_and_ventricular_fibrillation.html (671 words)

	Atrial Fibrillation - Page 1
		Atrial fibrillation (AF) is an abnormal heartbeat that affects the upper chambers of the heart, or
		During atrial fibrillation the atria quiver rather than contract normally because of rapid and irregular electrical signals in the heart.
		Atrial fibrillation causes approximately 15 percent of all strokes.
	heart.healthcentersonline.com /arrhythmia/atrialfibrillation.cfm (476 words)

	afib, atrial fib, ablation, atrial fibrillation
		Certain patients with isolated atrial fibrillation, especially after failed percutaneous ablation or with continuous atrial fibrillation and/or enlarged atria, are candidates for the Maze procedure.
		Atrial fibrillation is very common in patients who require heart surgery for other reasons (such as mitral valve surgery, aortic valve surgery, coronary artery bypass grafting, and other surgical procedures).
		During surgical procedures to treat atrial fibrillation, the left atrial appendage is removed and the tissue is closed with a special stapling device.
	www.clevelandclinic.org /heartcenter/pub/atrial_fibrillation/surgtx.htm (2513 words)

	Electrical cardioversion for atrial fibrillation
		To stop atrial fibrillation that has not stopped on its own or after a trial of antiarrhythmic medications has failed.
		If you have had atrial fibrillation for longer than 48 hours, your doctor will probably recommend that you take the anticoagulant warfarin (such as Coumadin) for at least 3 weeks before and for 1 to 3 months after the procedure.
		Alternately, if you have had atrial fibrillation for more than 48 hours but a test called transesophageal electrocardiogram has ruled out the presence of blood clots in the upper heart chambers (atria), you will not need anticoagulants before the procedure.
	www.webmd.com /hw/heart_disease/hw160011.asp (746 words)

	atrial fibrillation
		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.
		Some patients are very unwell in atrial fibrillation but many after a while (maybe a month or so) and with relatively safe medications that only slow the heart rate and blood thinners live well with their fibrillation.
		This report is of two cases of atrial fibrillation and one case of sudden death with exposure to a halogenated hydrocarbon CFC 113.
	sprojects.mmi.mcgill.ca /heart/wellaf.html (3658 words)

	Heart Info - Ventricular Fibrillation/Ventricular Tachycardia
		Ventricular fibrillation is a life-threatening electrical abnormality of the heart.
		Both ventricular fibrillation and ventricular tachycardia tend to occur in hearts that have been previously damaged either by a heart attack or some other etiology.
		With ventricular fibrillation, there is no blood pressure so the patient will immediately pass-out and if not resuscitated or if CPR is not initiated, the patient will suffer irreversible brain damage in five to six minutes.
	www.heartinfo.org /ms/ency/399/main.html (1396 words)

	Atrial Fibrillation
		Primary or lone atrial fibrillation is atrial fibrillation without evidence of underlying heart disease.
		Secondary atrial fibrillation is caused by cardiac disease that affects the atria.
		For many people with infrequent and brief episodes of atrial fibrillation, the episodes are brought on by a number of "triggers." Because many of these involve overindulgence, medical professionals sometimes call this "holiday heart." Some of these people are able to avoid episodes or have fewer episodes by avoiding their trigger.
	www.emedicinehealth.com /atrial_fibrillation/page2_em.htm (288 words)

	Atrial fibrillation - Voyager, the free encyclopedia (Site not responding. Last check: 2007-10-30)
		Atrial fibrillation (AF or afib) is a cardiac arrhythmia (an abnormality of heart rate or rhythm) originating in the atria.
		In addition, the erratic wall motion of the atria leads to blood stasis which predisposes to thrombosis and embolism to the brain and other areas, being a prime risk factor for stroke, the most feared complication of atrial fibrillation.
		It is not uncommon to identify atrial fibrillation on a routine physical examination or electrocardiogram.
	www.voyager.in /Atrial_fibrillation (1692 words)

	ABC of Atrial Fibrillation: AETIOLOGY, PATHOPHYSIOLOGY, AND CLINICAL FEATURES -- Lip et al. 311 (7017): 1425 -- BMJ
		Thyrotoxicosis is an important and curable cause of atrial fibrillation.
		Pneumonia is commonly associated with atrial fibrillation in
		Predictors of primary atrial fibrillation and concomitant clinical and hemodynamic changes in patients with chronic heart failure: a prospective study in 344 patients with baseline sinus rhythm
	bmj.bmjjournals.com /cgi/content/full/311/7017/1425 (1498 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 (2507 words)

	Dangers of Guidant CONTAK RENEWAL: Ventricular Fibrillation
		It is caused by the lack of coordination in the large chambers of your heart.
		Ventricular fibrillation is a medical emergency: if the arrhythmia continues for more than a few seconds, blood circulation will cease, as evidenced by lack of pulse and blood pressure and death will ensue.
		Ventricular fibrillation, along with an arrhythmia called pulseless ventricular tachycardia underlie most cases of cardiac arrest and sudden cardiac death.
	www.weitzlux.com /guidant/contakrenewalh135/ventricularfibrillation_1312.html (364 words)

	atrial fibrillation, afib, pulmonary vein isolation ablation
		Atrial fibrillation is an abnormal heart rhythm originating in the atria.
		People with atrial fibrillation are five to seven times more likely to have a stroke than the general population.
		During surgical procedures to treat atrial fibrillation, the left atrial appendage may be removed and the tissue is closed with a special stapling device.
	www.clevelandclinic.org /heartcenter/pub/guide/disease/electric/afib.htm (2436 words)

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