Supraventricular Tachycardia is defined as:

Supraventricular Tachycardia (SVT) is characterized as a rapid heart rate that originates from above the ventricles, specifically from areas such as the atria or the atrioventricular (AV) node. This definition is crucial because it helps pinpoint the heart's electrical activity's abnormality, which occurs due to a reentrant circuit or increased automaticity in the atrial tissue.

The rapid heart rate in SVT is typically defined as exceeding 100 beats per minute and can often go as high as 200 beats per minute or more. Understanding that SVT arises from above the ventricles is essential for recognizing the arrhythmia’s distinction from ventricular tachycardia, which originates in the ventricles, as well as other types of arrhythmias that may have different underlying causes and management strategies.

The other options describe conditions that do not accurately reflect the defining characteristics of SVT. For instance, slow heart rates or those originating in the ventricles would not be classified as SVT, and other arrhythmias may present with different patterns rather than the rapid and consistent rhythm associated with SVT.