What characteristic feature can help distinguish V-tach from SVT?

What characteristic feature can help distinguish V-tach from SVT?

• A. Presence of P waves
• B. Duration of the rhythm
• C. QRS complex duration
• D. Atrial flutter waves

Answer: (C)

The characteristic feature that can help distinguish ventricular tachycardia (V-tach) from supraventricular tachycardia (SVT) is the duration of the QRS complex. In V-tach, the QRS complexes are typically wider than 0.12 seconds because the impulses are originating from the ventricles, which causes a slower conduction through the myocardium. In contrast, SVT usually presents with a narrow QRS complex, typically less than 0.12 seconds, since the impulse originates above the ventricles, allowing for normal conduction pathways.

Understanding the width of the QRS complex is crucial in differentiating between these two tachycardias, as it gives insight into the site of origin of the electrical impulses. Thus, recognizing that a wide QRS complex indicates V-tach while a narrow QRS suggests SVT can inform clinical management and intervention strategies effectively.