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The nature and evolution of ventricular arrhythmias in acute myocardial infarction
M Di Biase1, F Minafra, S Iliceto
1Division of Cardiology, University of Bari, Italy.
Insights
Ventricular arrhythmias after acute myocardial infarction initially decrease but may increase later. Most patients maintain their arrhythmia status long-term, with severity correlating to myocardial infarction markers.
Area of Science:
- Cardiology
- Electrophysiology
- Critical Care Medicine
Background:
- Ventricular arrhythmias are a serious complication following acute myocardial infarction (AMI).
- Understanding the natural evolution of these arrhythmias is crucial for patient management and prognosis.
Purpose of the Study:
- To investigate the natural time course of ventricular arrhythmias in patients experiencing their first AMI.
- To identify patterns of arrhythmia behavior and long-term outcomes.
Main Methods:
- A cohort of 56 AMI patients admitted within 3 hours of symptom onset were monitored.
- Holter monitoring was performed at multiple time points: 24h, 48h, day 8, day 18, and 2-year follow-up.
- Limited drug administration was employed, and antiarrhythmic drugs were discontinued before follow-up assessments.
Main Results:
- A significant reduction in ventricular arrhythmias was observed from day 1 to day 8.
- A non-significant increase occurred between day 8 and day 18, persisting at the 2-year follow-up.
- Three patient patterns emerged: steady reduction (44%), constant incidence (24%), and fluctuating arrhythmias (31%).
- Peak and mean lactic dehydrogenase levels correlated with arrhythmia severity.
Conclusions:
- Ventricular arrhythmias in AMI patients show an initial decreasing trend followed by potential late increases.
- Long-term arrhythmia status is often stable from day 18 onwards, particularly in patients with higher Lown grades.
- Myocardial infarction extent, indicated by LDH levels, is linked to ventricular arrhythmia severity.
Abstract:
The natural evolution of ventricular arrhythmias complicating a first episode of acute myocardial infarction has been studied in a group of 56 consecutive patients, who were admitted to the Coronary Care Unit within three hours of the onset of symptoms, and in whom drug administration (digitalis, antiarrhythmics, diuretics and heparin) was limited. Ventricular arrhythmias have been evaluated by means of Holter monitoring performed during the first 24 hours, the second 24 hours, the eighth day, the 18th day and two years after discharge when antiarrhythmic drugs has been discontinued for at least five half-lives. The overall incidence and prevalence of ventricular arrhythmias showed a steady and statistically significant reduction from the first to the eighth day, and a not statistically significant increase from the eighth to the 18th day. The latter increase was still present at the two-year follow-up. The one-by-one behaviour analysis of discharged patients delineated three different patterns: patients who presented a steady reduction in ventricular arrhythmias from the first to the 18th day (44%); patients who showed an almost constant incidence of ventricular arrhythmias during all phases of acute myocardial infarction (24%); and patients who presented both a decrease and an increase in their ventricular arrhythmias (31%). The follow-up at two years showed that the majority of patients, especially those discharged in a high Lown class, had the same arrhythmias as at their follow-up on the 18th day. Correlation of ventricular arrhythmias with the extent of the infarcted area demonstrated that only the peak and mean values of lactic dehydrogenase correlated with the severity of ventricular arrhythmias.(ABSTRACT TRUNCATED AT 250 WORDS)