Nonsustained ventricular tachycardia during programmed ventricular stimulation: criteria for a positive test

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Programmed ventricular stimulation (PVS) is used to assess risk in patients with ventricular tachycardia (VT).
• There is ongoing debate regarding the optimal criteria for defining a positive PVS test.

Purpose of the Study:

• To retrospectively analyze PVS results in patients with documented VT.
• To determine the most accurate PVS criteria for predicting future cardiac events.

Main Methods:

• Retrospective analysis of PVS results in 50 patients with documented sustained VT.
• Patients underwent PVS with single/double extrastimuli and burst pacing.
• Antiarrhythmic drug therapy was guided by PVS results and Holter monitoring.

Main Results:

• Induction of non-sustained or sustained VT during PVS was significantly associated with higher rates of sudden death or VT recurrence (p < 0.001).
• Defining a positive PVS test as the induction of 5 or more VT beats maximized predictive value and accuracy.
• This criterion showed significantly higher predictive accuracy compared to using only sustained VT.

Conclusions:

• PVS is a valuable tool for predicting adverse events in patients with VT.
• Using a threshold of 5 or more induced VT beats during PVS improves risk stratification.
• Optimized PVS criteria enhance the prediction of sudden cardiac death and VT recurrence.