Arrhythmia
Also called: Irregular heartbeat
National Institutes of Health
Other Languages
An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia. The most common type of arrhythmia is atrial fibrillation, which causes an irregular and fast heart beat.
Many factors can affect your heart's rhythm, such as having had a heart attack, smoking, congenital heart defects, and stress. Some substances or medicines may also cause arrhythmias.
Symptoms of arrhythmias include
- Fast or slow heart beat
- Skipping beats
- Lightheadedness or dizziness
- Chest pain
- Shortness of breath
- Sweating
Your doctor can run tests to find out if you have an arrhythmia. Treatment to restore a normal heart rhythm may include medicines, an implantable cardioverter-defibrillator (ICD) or pacemaker, or sometimes surgery.
NIH: National Heart, Lung, and Blood Institute
- About Arrhythmia (American Heart Association)
- Arrhythmia (American Academy of Family Physicians)Also in Spanish
- Arrhythmia
(National Heart, Lung, and Blood Institute)Also in Spanish - Categories of Arrhythmias (Texas Heart Institute)Also in Spanish
- Common Tests for Arrhythmia (American Heart Association)
- Electrophysiology Studies (EPS) (American Heart Association)
- Heart Health Tests: MedlinePlus Health Topic (National Library of Medicine)Also in Spanish
- Holter and Event Monitors (National Heart, Lung, and Blood Institute)
- Skipped Beats (Heart Rhythm Society)
- Slow Heartbeat (Heart Rhythm Society)
- Syncope (National Institute of Neurological Disorders and Stroke)
- Tilt Table Test (Mayo Foundation for Medical Education and Research)Also in Spanish
- Risk Factors and Prevention (Heart Rhythm Society)
- Understand Your Risk for Arrhythmia (American Heart Association)
- Antiarrhythmics (Texas Heart Institute)Also in Spanish
- Cardioversion (National Heart, Lung, and Blood Institute)Also in Spanish
- Catheter Ablation (National Heart, Lung, and Blood Institute)Also in Spanish
- Defibrillators (National Heart, Lung, and Blood Institute)
- Medications for Arrhythmia (American Heart Association)
- Pacemakers and Implantable Defibrillators: MedlinePlus Health Topic (National Library of Medicine)Also in Spanish
- Prevention and Treatment of Arrhythmia (American Heart Association)
- AED (Automated External Defibrillator) Programs: Questions and Answers (American Heart Association) - PDF
- All about Heart Rate (Pulse) (American Heart Association)
- Automated External Defibrillators: Do You Need an AED? (Mayo Foundation for Medical Education and Research)Also in Spanish
- Substances and Heart Rhythm Disorders (Heart Rhythm Society)
- Sudden Death in Young People--Heart Problems Often Blamed (Mayo Foundation for Medical Education and Research)Also in Spanish
- Why Arrhythmia Matters (American Heart Association)
- Arrhythmogenic Right Ventricular Dysplasia (American Academy of Family Physicians)Also in Spanish
- Atrial Flutter (Heart Rhythm Society)
- Bradycardia (Mayo Foundation for Medical Education and Research)Also in Spanish
- Brugada Syndrome (Mayo Foundation for Medical Education and Research)Also in Spanish
- Bundle Branch Block (Mayo Foundation for Medical Education and Research)
- Cardiac Arrest: MedlinePlus Health Topic (National Library of Medicine)Also in Spanish
- Heart Block (National Heart, Lung, and Blood Institute)
- Heart Diseases and Disorders (Heart Rhythm Society)
- Long QT Syndrome (National Heart, Lung, and Blood Institute)
- Other Rhythm Disorders (American Heart Association)
- Palpitations (National Heart, Lung, and Blood Institute)
- Postural Tachycardia Syndrome (National Institute of Neurological Disorders and Stroke)
- Premature Contractions - PACs and PVCs (American Heart Association)
- Premature Ventricular Contractions (PVCs) (Mayo Foundation for Medical Education and Research)Also in Spanish
- Sick Sinus Syndrome (Mayo Foundation for Medical Education and Research)Also in Spanish
- Tachycardia (Mayo Foundation for Medical Education and Research)Also in Spanish
- Tachycardia: Fast Heart Rate (American Heart Association)
- Ventricular Fibrillation (Mayo Foundation for Medical Education and Research)Also in Spanish
- What Is Sudden Cardiac Arrest? (National Heart, Lung, and Blood Institute)
- Wolff-Parkinson-White Syndrome and Accessory Pathways (American Heart Association)
- Genetics Home Reference: Andersen-Tawil syndrome (National Library of Medicine)
- Genetics Home Reference: ankyrin-B syndrome (National Library of Medicine)
- Genetics Home Reference: Brugada syndrome (National Library of Medicine)
- Genetics Home Reference: catecholaminergic polymorphic ventricular tachycardia (National Library of Medicine)
- Genetics Home Reference: chronic atrial and intestinal dysrhythmia (National Library of Medicine)
- Genetics Home Reference: Jervell and Lange-Nielsen syndrome (National Library of Medicine)
- Genetics Home Reference: progressive familial heart block (National Library of Medicine)
- Genetics Home Reference: Romano-Ward syndrome (National Library of Medicine)
- Genetics Home Reference: short QT syndrome (National Library of Medicine)
- Genetics Home Reference: sick sinus syndrome (National Library of Medicine)
- Genetics Home Reference: Timothy syndrome (National Library of Medicine)
- Genetics Home Reference: Wolff-Parkinson-White syndrome (National Library of Medicine)
- Sudden Cardiac Arrest (SCA) Risk Assessment (Heart Rhythm Society)
- Arrhythmias
(Medical Encyclopedia)Also in Spanish - Cardiac conduction system (Medical Encyclopedia)Also in Spanish
- Heartbeat (Medical Encyclopedia)Also in Spanish
- ClinicalTrials.gov: Arrhythmias, Cardiac (National Institutes of Health)
- ClinicalTrials.gov: Bradycardia (National Institutes of Health)
- ClinicalTrials.gov: Tachycardia (National Institutes of Health)
- ClinicalTrials.gov: Tachycardia, Ectopic Atrial (National Institutes of Health)
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- Arrhythmia -- see more articles
- Heart Anatomy (Texas Heart Institute)Also in Spanish
- Heart and Stroke Encyclopedia (American Heart Association)
- Heart Information Center (Texas Heart Institute)Also in Spanish
- How the Heart Works (National Heart, Lung, and Blood Institute)
- Arrhythmias (For Parents) (Nemours Foundation)Also in Spanish
- Children and Arrhythmia (American Heart Association)
- Premature Ventricular Contractions (For Parents) (Nemours Foundation)
- Treating Arrhythmias in Children (American Heart Association)
- Types of Arrhythmia in Children (American Heart Association)
- Arrhythmias (Nemours Foundation)Also in Spanish
- Arrhythmias (Medical Encyclopedia)Also in Spanish
- Atrial fibrillation or flutter (Medical Encyclopedia)Also in Spanish
- Cardiac ablation procedures (Medical Encyclopedia)Also in Spanish
- Ectopic heartbeat (Medical Encyclopedia)Also in Spanish
- Electrocardiogram (Medical Encyclopedia)Also in Spanish
- Exercise stress test (Medical Encyclopedia)Also in Spanish
- Heart palpitations (Medical Encyclopedia)Also in Spanish
- Holter monitor (24h) (Medical Encyclopedia)Also in Spanish
- Paroxysmal supraventricular tachycardia (PSVT) (Medical Encyclopedia)Also in Spanish
- Ventricular tachycardia (Medical Encyclopedia)Also in Spanish
- Wolff-Parkinson-White syndrome (Medical Encyclopedia)Also in Spanish
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