Prognostic factors in nonsustained ventricular tachycardia

Area of Science:

• Cardiology
• Electrophysiology
• Sudden Cardiac Death

Background:

• Nonsustained ventricular tachycardia (VT) is a recognized arrhythmia.
• Predicting sudden cardiac death (SCD) risk in these patients remains challenging.

Purpose of the Study:

• To evaluate the prognostic value of electrophysiologic study (EPS) findings and left ventricular ejection fraction (LVEF) in patients with spontaneous nonsustained VT.

Main Methods:

• Electrophysiologic studies were conducted in 83 patients with spontaneous nonsustained VT.
• Follow-up data on mortality, including sudden death, were collected.
• Multivariate analysis assessed risk factors for SCD.

Main Results:

• Sudden death occurred in 10 patients, all with LVEF ≤0.40.
• Inducible sustained VT was associated with increased SCD risk.
• Low LVEF (≤0.40) was the strongest predictor of SCD, conferring a 3-fold increased risk.
• Patients with both inducible sustained VT and LVEF ≤0.40 had a 7-fold increased risk of SCD.

Conclusions:

• Patients with nonsustained VT and LVEF >0.40 generally have a favorable prognosis.
• Noninducibility of VT on EPS does not guarantee a good outcome, especially in cardiomyopathy patients.
• LVEF ≤0.40 and inducible sustained VT are critical independent predictors of SCD risk.