Therapy for late post infarction ventricular tachycardia.

Area of Science:

• Cardiology
• Electrophysiology
• Sudden Cardiac Death

Background:

• Non-sustained ventricular tachycardia (VT) in the late post-myocardial infarction (MI) period is a known predictor of sudden cardiac death.
• Patients with 3-beat VT on Holter monitoring may exhibit electrical instability.

Purpose of the Study:

• To investigate if patients with 3-beat VT on Holter monitoring in the late infarction period demonstrate electrical instability at electrophysiologic studies.
• To assess the safety and efficacy of programmed electrical stimulation (PES) in managing high-risk post-MI patients.

Main Methods:

• Forty-seven patients with ≥3-beat VT on Holter monitoring were identified.
• Twenty-nine patients underwent invasive electrophysiologic studies (EPS) including programmed electrical stimulation (PES).
• Antiarrhythmic therapy was guided by PES results.

Main Results:

• Of 29 patients undergoing EPS, 28 had inducible VT (18 sustained, 10 non-sustained).
• No complications occurred during EPS.
• After follow-up, 26 of 28 inducible patients were alive and well; no sudden deaths occurred in this group.
• PES identified effective antiarrhythmic agents for patients.

Conclusions:

• Programmed electrical stimulation (PES) studies are safe and effective for assessing therapy in high-risk post-MI patients.
• PES can identify patients at risk for sudden death and guide treatment to improve outcomes.
• Early identification and management of electrical instability post-MI are crucial for preventing sudden cardiac death.