• A disorder characterized by an electrocardiographic finding of a tachycardia which does not originate in the ventricles or His Purkinje system. There is an abnormally high heart rate and QRS complexes are typically narrow, but aberration or preexcitation may be present. (CDISC)
  NCI
  U.S. National Cancer Institute, 2021
• A tachycardia originating in the atria of the heart.
  NICHD Pediatric Terminology
  U.S. National Cancer Institute, 2021
• An abnormally fast heartbeat originating in heart tissue above the ventricles.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Supraventricular tachycardia (SVT) is an abnormally increased heart rate (over 100 beats per minute at rest) with origin above the level of the ventricles.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2025
• (tachycardia, supraventricular) A generic expression for any tachycardia that originates above the BUNDLE OF HIS.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A disorder characterized by a dysrhythmia with a heart rate greater than 100 beats per minute that originates above the ventricles.
  Common Terminology Criteria for Adverse Events
  U.S. National Institutes of Health, 2021
• Supraventricular tachycardia (SVT), also called paroxysmal supraventricular tachycardia, is defined as an abnormally fast heartbeat. It's a broad term that includes many forms of heart rhythm problems (heart arrhythmias) that originate above the ventricles (supraventricular) in the atria or AV node.
  Mayo Clinic
  Mayo Foundation for Medical Education and Research, 2025