Tachycardias that originate within the atria or above the ventricles are referred to as

• A. SVT
• B. VT
• C. AF
• D. VTAC

Answer: (A)

Tachycardias that originate within the atria or above the ventricles are called supraventricular tachycardias. The key point is that the rhythm starts above the ventricular muscle, often in the atria or the AV nodal region. These rhythms typically produce a narrow QRS complex because ventricular activation uses the normal conduction system, unless there’s aberrant conduction. Examples include atrial tachycardia and AV nodal reentrant tachycardia.

This contrasts with ventricular tachycardia, which starts in the ventricles and usually has a wide QRS complex and can be more unstable. Atrial fibrillation is an irregular, chaotic atrial rhythm with an unpredictable ventricular response, not a single fast, regular rhythm like an SVT. So, the tachycardias originating above the ventricles are classified as supraventricular tachycardias.