Which characterization best fits sustained ventricular tachycardia?

Which characterization best fits sustained ventricular tachycardia?

• A. Short-lasting episodes less than 15 seconds
• B. Rapid heart rate exceeding 100 beats per minute
• C. Long-lasting episodes greater than 30 seconds
• D. Infrequent PVC occurrences

Answer: (C)

Sustained ventricular tachycardia is characterized as a series of episodes where the heart rhythm persists for a significant duration, specifically longer than 30 seconds. This condition indicates that the tachycardia is not self-limiting; rather, it continues to pose a risk for hemodynamic instability and potential progression to more serious arrhythmias, such as ventricular fibrillation.

The emphasis on lasting longer than 30 seconds distinguishes it from other transient forms of tachycardia. It underscores the importance of monitoring and intervention, as the sustained nature of this rhythm can lead to compromised cardiac output and necessitate urgent medical intervention.

In contrast, episodes less than 15 seconds do not meet the criteria for sustained ventricular tachycardia, as they are considered nonsustained. Rapid heart rates exceeding 100 beats per minute are common in various types of tachycardias, but on their own, they do not define sustained ventricular tachycardia without reference to duration. Additionally, infrequent PVC occurrences are distinct from sustained ventricular tachycardia, which involves a consistent rapid rhythm rather than sporadic premature contractions. Thus, the clear definition and longer duration associated with sustained ventricular tachycardia are crucial in understanding its clinical implications