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[Is sudden reperfusion more arrhythmogenic during thrombolysis for myocardial infarction?]
V Gressin1, A P Gorgels, Y Louvard
1Service de cardiologie, hôpital Gilles de Corbeil, Corbeil-Essonnes.
Insights
Rapid ST segment normalization during acute myocardial infarction thrombolysis correlates with increased ventricular arrhythmias, particularly prolonged ventricular tachycardias. Faster reperfusion appears more arrhythmogenic.
Area of Science:
- Cardiology
- Electrophysiology
- Myocardial Infarction Research
Context:
- Intravenous thrombolysis is a critical treatment for acute myocardial infarction (AMI).
- Ventricular arrhythmias are a significant complication following AMI and reperfusion therapy.
- ST segment changes on electrocardiograms (ECGs) reflect myocardial reperfusion status.
Purpose:
- To analyze the relationship between ST segment normalization speed and the occurrence of ventricular arrhythmias during and after intravenous thrombolysis for AMI.
- To investigate specific types of ventricular arrhythmias, including ventricular extrasystoles, accelerated idioventricular rhythms, and ventricular tachycardias, in relation to reperfusion rates.
Summary:
- This study analyzed 41 patients undergoing thrombolysis for AMI, assessing ventricular arrhythmias via Holter monitoring and ECGs in relation to ST segment normalization times.
- Patients were categorized into rapid (<60 min), intermediate (60-180 min), and slow (>180 min) ST normalization groups.
- While overall arrhythmia incidence was similar, prolonged ventricular tachycardias were significantly higher in the rapid normalization group (69%, p=0.002).
- A higher number of ventricular arrhythmias, including extrasystoles and accelerated idioventricular rhythms, were observed with faster ST segment changes.
Impact:
- Findings suggest that the speed of ST segment normalization is a predictor of ventricular arrhythmia burden post-thrombolysis.
- Rapid reperfusion, indicated by quick ST normalization, may be associated with a greater pro-arrhythmic effect.
- This highlights the importance of monitoring arrhythmias in relation to reperfusion dynamics for optimizing AMI management.
Abstract:
The object of this study was to analyse ventricular arrhythmias occurring during intravenous thrombolysis for acute myocardial infarction with respect to ST segment changes on 24 hour Holter ECG monitoring initiated at the same time as thrombolytic therapy and on repeated 12 lead electrocardiogrammes. Forty-one patients in whom the infarct-related artery was patent at coronary angiography carried out 30.5 +/- 3.1 hours (< or = 24 hours in 59% of cases) after the onset of chest pain were included. The time to normalisation of the ST segment was defined as the interval between maximum ST elevation to a steady state and helped identify rapid (< or = 60 minutes, n = 13) from intermediate (60-180 minutes, n = 15) and slow (> 180 minutes, n = 13) reperfusion. The incidence of ventricular arrhythmias was the same in all three groups, except for prolonged ventricular tachycardias (> 15 complexes): 69%, 13% and 15% respectively (p = 0.002). The number of arrhythmias was greater when the ST segment changes were rapid than when they were intermediate or slow. This was true for ventricular extrasystoles (p < 0.05), accelerated idioventricular rhythms (p < 0.05), early (< or = 6 hours from onset of thrombolysis) accelerated idioventricular rhythms (p < 0.01) and ventricular tachycardias (p < 0.05). Therefore, the number of ventricular arrhythmias seems to be related to the speed of ST segment change, suggesting that more sudden reperfusion is more arrhythmogenic.