Arrhythmia « Back to Glossary IndexAn abnormal heartbeat. Related Articles: Glossary: Abnormal Heart RhythmGlossary: Atrial FlutterGlossary: Atrial TachycardiaGlossary: Cardiac Resynchronization Therapy-Defibrillator [CRT-D]Glossary: Cardiovascular Disease [CVD]« Back to Glossary Index