supraventricular arrhythmia supraventricular tachycardia 2026-04-06T12:17:56Z SVT Supraventricular tachycardias are characterized by a narrow QRS complex and an elevated heart rate. They encompasses various atrial, junctional (ectopic), and atrioventricular tachycardias. MPheno.ontology rapid heart rhythm originating at or above the atrioventricular node supraventricular tachycardias SV tachycardia MP:0031715