Polymorphous ventricular tachycardia in acute myocardial infarction

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Polymorphous ventricular tachycardia (VT) is considered rare in acute coronary heart disease.
• The actual prevalence and clinical characteristics of VT in acute myocardial infarction (MI) remain largely undetermined.

Purpose of the Study:

• To determine the prevalence of polymorphous VT in patients admitted with acute myocardial infarction (MI).
• To evaluate the treatment strategies and prognosis associated with polymorphous VT in the context of acute MI.

Main Methods:

• A retrospective review of 771 consecutive patients admitted with acute MI.
• Identification and analysis of patients who developed polymorphous VT during hospitalization.

Main Results:

• Nine patients (1.2%) experienced polymorphous VT, with no identifiable predisposing factors.
• The arrhythmia was largely resistant to standard treatments like cardioversion and overdrive pacing.
• Verapamil demonstrated effectiveness in 3 out of 4 patients treated.
• Mortality was high, with 6 deaths during hospitalization and 3 within 6 months post-discharge.

Conclusions:

• Polymorphous VT in acute MI is associated with a significantly poor prognosis compared to regular VT.
• Treatment of polymorphous VT in acute ischemia is challenging and may require alternative strategies.
• Verapamil warrants further investigation in a therapeutic trial for this specific patient group.