NCIt definition : 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);
Alternative definition : NICHD: A tachycardia originating in the atria of the heart.; CTCAE: A disorder characterized by a dysrhythmia with a heart rate greater than 100
beats per minute that originates above the ventricles.;