Cardiac arrhythmia is a group of conditions in which the muscle contraction of the heart is irregular or is faster or slower than normal. Cardiac dysrhythmia is technically more correct, as arrhythmia would imply that there is "no rhythm," but this term is not used frequently.
Some arrhythmias are life-threatening medical emergencies that can cause cardiac arrest and sudden death. Others cause aggravating symptoms, such as an awareness of a different heart beat, or palpitation, which can be annoying. Some are quite benign and normal. Sinus arrhythmia is the mild acceleration followed by slowing of the normal rhythm that occurs with breathing. In adults the normal heart rate ranges from 60 beats per minute to 100 beats per minute. The normal heart beat is controlled by a small area in the upper chamber of the heart called the sinoatrial node or sinus node. The sinus node contains specialized cells that have spontaneous electrical activity that starts each normal heart beat.

Advice from Dr. Dave and Dr. Dee - An explanation of premature atrial contractions and premature ventricular contractions.
Alternative Treatments - Explained in lay mans terms what arrhythmias are, with suggested herbs and vitamins.
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American Heart Association - An arrhythmia is an irregular heartbeat. Find out more about the symptoms and treatments of this condition. For patients and professionals.
Meta Description: [ Arrhythmias are disorders of the heart's regular rhythmic beating. Find out what you need to know about this condition. ]
Arrhythmia: A Problem With Your Heartbeat - A discussion on arrhythmias regarding what it is, symptoms, causes, how serious it is, how do you know if you have them, types and treatment.
Meta Description: [ Information about arrhythmia from the American Academy of Family Physicians. ]
Arrythmia Awareness Week 2004 - Supported by organisations whose aims are to improve the lives of individuals and families who have been impacted as a consequence of suffering cardiac arrhythmia. May 12 - 18, 2004.
Cardiology Associates - An in-depth look at arrhythmias, discussing symptoms, causes, how serious and common they are and research among many other topics.
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Cardionetics - A look at sinus rhythms, blocks, delays, premature beats, supraventricular and ventricular arrhythmias.
Meta Description: [ Cardiac Arrhythmia ]
Cleveland Clinic Heart Center - Details about Atrial fibrillation, an abnormal heart rhythm. Includes the causes, diagnosis and treatment.
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Continuing Education: New Trends in Arrhythmia Management - A list of the program objectives, web cast, support and evaluation.
Database of Inherited Cardiac Arrhythmias - An official project of the Working Group on Arrhythmias of the European Society of Cardiology. Provides general description, genetic data (mutations, linkage data, references) concerning the inherited arrhythmigenic diseases.
Doctors' Medical Library - Discussion about arrhythmias including nutritional medicine, chelation therapy and homeopathy.
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Einthoven - Continuing education and advances in cardiac arrhythmias. Includes news, key papers, case histories and manuals.
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Family Practice Notebook: Arrhythmias in Athletes - Non-cardiac causes, types, worrisome symptoms and worrisome signs (red flags) are some topics discussed.
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Guidelines for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices - A Report of the American College of Cardiology and American Heart Association Task Force on Practice Guidelines. Committee on Pacemaker Implantation.
Health Factsheets From BUPA - Explaining the causes, symptoms and treatment of arrhythmia, available for down loading in Adobe acrobat format.
Meta Description: [ An arrhythmia is when the heart beats excessively slow or fast, or the rhythm is irregular. Arrhythmias result from damage to the heart's electrical system - BUPA health factsheet. ]
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Health South - Talks about causes, incidence and risk factors, types, symptoms, treatment and prevention for arrhythmias.
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HeartPoint - In-depth detail about this disorder including symptoms, what types, causes, what patient can do, as well as pacemakers, atrial fibrillaion and ventricular arrhythmias.
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Hospital Practice - Care and management of atrial fibrillation, atrial flutter, supraventricular tachycardia, ventricular arrhythmia and a look at syncope.
International Health News - A comprehensive, fully referenced review of the causes, prevention and treatment options for lone atrial fibrillation. A stress-related disorder that is becoming increasingly common.
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Irregular Rhythms - Detailed information about all the types of arrhythmias, flutters and tachycardias.
Journal of the Canadian Working Group for Cardiac Pacing/ Journal du Groupe de Travail Canadien po - For care givers, patients, and industrial sponsors to share information regarding cardiac pacemakers and defibrillators.
King Faisal Specialist Hospital and Research Centre - Explanation, diagnosing and treatment of arrhythmias.
Lethal Dysrhythmias - Offers in depth information on premature ventricular complexes (PVCs), ventricular tachycardia, ventricular flutter, ventricular fibrillation, asystole/ventricular standstill, sinus arrest and pulseless electrical activity (PEA).
London Health Sciences Centre - A list of doctors who provide arrhythmia services, locations and phone numbers. General information as to who may seek their help, diagnostic tools, therapeutic services and training program.
Mayo Clinic Electrophysiology Laboratory - A look at the heart and its rhythms, diagnosing, electrophysiologist, bradycardias, tachycardias, supraventricular tachycardias, atrial fibrillation and vetricular tachyarrhythmias.
Meta Description: [ Arrhythmia diagnosis and treatment by specialists and electrophysiologists at Mayo Clinic. ]
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Mayo Clinic Heart Rhythm Center - Brief description of arrhythmias and an in depth look at the different types including bradycardias, tachycardias and atrial fibrillation.
MedicineNet.com - Presents a detailed discussion on this disorder, giving complete definition, what a normal heart beat is, symptoms, causes, as well as all the different types of arrhythmias.
Meta Description: [ Explains palpitations (abnormal heart beats) and includes symptoms of arrhythmias and causes. ]
OnHealth with WebMD - Detailed look at an arrhythmia, the causes, and diagnosing. The different types and treatments available.
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Palpitations - Describes terms, doctors' explanations, and what exactly a palpitation is.
Meta Description: [ Explains palpitations (abnormal heart beats) and includes symptoms of arrhythmias and causes. ]
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SleepTight - Explanation of arrhythmias.
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St. Luke's-Roosevelt Hospital Center's Arrhythmia Service - QandAs, electrophysiology information, news, diagnostic procedures, therapeutic procedures and an explanation is presented.
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Roosevelt Hospital Center delivers advanced, innovative diagnostic and
therapeutic procedures to patients with the full spectrum of cardiac
arrhythmias. ]
SupraVentricularTachycardia Support Group - SVT or Supra Ventricular Tachycardia is a disorder where the heart starts to beat very hard and very fast for no apparent reason.
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Temple University Hospital Health Information-Palpatations - Provides information on symptoms, causes, diagnosis, and treatment.
US Food and Drug Administration - An In-depth discussion on ventricular arrhythmias and new drugs and devices in curbing deaths from this disorder.
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Vanderbilt Medical Center - Discussion of four types of arrhythmias and brief look at management in children.
Wolff-Parkinson-White Syndrome - American Heart Association looks at this disease along with the symptoms and treatment.
Meta Description: [ In a normal heart, electrical signals use only one path to move through the heart and cause it to beat. If there's an extra conduction pathway, the electrical signal may arrive at the ventricles too soon. ]
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