St. Luke's-Roosevelt Hospital Center's Arrhythmia Service - QandAs, electrophysiology information, news, diagnostic procedures, therapeutic procedures and an explanation is presented. Advice from Dr. Dave and Dr. Dee - An explanation of premature atrial contractions and premature ventricular contractions. 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. Vanderbilt Medical Center - Discussion of four types of arrhythmias and brief look at management in children. 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. Doctors' Medical Library - Discussion about arrhythmias including nutritional medicine, chelation therapy and homeopathy. 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. 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. Sudden Arrhythmic Death Syndrome - Information for the family and relatives of a young person who has died. SADS Foundation - A non-profit organization providing information on the disease. Arrhythmia Alliance - Group of individuals, patient groups, charities, and medical professionals aimong to raise awareness and promote treatment. Includes medical information and FAQ. NYU Langone Medical Center - Information about arrhythmias including the causes, various types of arrhythmias, symptoms, diagnosis, and treatment. Family Practice Notebook: Arrhythmias in Athletes - Non-cardiac causes, types, worrisome symptoms and worrisome signs (red flags) are some topics discussed. Alternative Treatments - Explained in lay mans terms what arrhythmias are, with suggested herbs and vitamins. UCLA Cardiac Arrhythmia Center - Official site for center, offering information on the disease and how to become a patient. NHS Choices: Supraventricular Tachycardia - Provides information on this condition which features episodes of abnormally fast heart rate. Includes details of symptoms, causes, diagnosis and treatment. American Heart Association - An arrhythmia is an irregular heartbeat. Find out more about the symptoms and treatments of this condition. For patients and professionals. SADS UK : The Ashley Jolly SAD Trust - Voluntary organization raising awareness about heart conditions in young people. Provides support to patients and families. 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. Palpitations - Describes terms, doctors' explanations, and what exactly a palpitation is. The Canadian Sudden Arrhythmia Death Syndromes (SADS) Foundation - Established in 1995, the only patient advocacy group in Canada dedicated to supporting families affected by inherited cardiac rhythm disorders.