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Time course of cardiac structural, functional and electrical changes in asymptomatic patients after myocardial
1II. Medizinische Universitätsklinik, Klinikum Mannheim der Universität Heidelberg, Germany.
Insights
Progressive left ventricular (LV) dilation after myocardial infarction (MI) increases sudden cardiac death risk. LV dilation correlates with electrical instability, a key predictor of death in post-MI patients.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Post-Myocardial Infarction Management
Background:
- Mechanisms linking left ventricular (LV) dysfunction and sudden cardiac death post-myocardial infarction (MI) are debated.
- Understanding these links is crucial for improving patient outcomes after MI.
Purpose of the Study:
- To investigate the relationship between LV dilation, electrical instability, and death in patients post-MI.
- To identify predictors of sudden cardiac death in this patient population.
Main Methods:
- Prospective study of 134 patients post-MI.
- Sequential assessment of LV volumes, hemodynamics, ECG, and 24-h Holter monitoring.
- Cardiac catheterization and coronary angiography performed as indicated.
Main Results:
- 16% of patients died, with 75% of deaths being sudden.
- Patients with LV dilation had a significantly higher mortality rate (32%) compared to those without (5.8%).
- LV dilation strongly correlated with electrical instability markers like Lown score and QTc prolongation.
Conclusions:
- Progressive LV remodeling post-MI is associated with increased risk of sudden cardiac death.
- Cardiac electrical instability is closely linked to LV dilation.
- Electrical instability and remodeling parameters predict sudden death, suggesting remodeling mediates the link between dysfunction and death.
Objectives:
We prospectively studied the relationship between left ventricular (LV) dilation, dysfunction, electrical instability and death in patients after a first myocardial infarction (MI) without symptoms of heart failure and ischemia.
Background:
Mechanisms linking LV dysfunction and sudden death in patients after MI remained controversial.
Methods:
Left ventricular volumes, hemodynamics, electrocardiogram and 24-h Holter recordings were sequentially obtained between two days and seven years after MI. Left ventricular catheterization and coronary angiography were performed, and revascularization was performed if appropriate.
Results:
Death occurred in 16 (12%) of the 134 patients included; it was of cardiac origin in 14 (88%) and sudden in origin in 12 (75%) patients. Of 37 (28%) patients with LV dilation, 12 died (32%); four patients (5.8%) died in the group without dilation. Left ventricular dilation was closely related to signs of electrical instability, as indicated by a significant correlation between end-diastolic LV volume index, Lown score (r = 0.98, p < 0.0001) and QTc prolongation (r = 0.998, p < 0.01), respectively.
Conclusions:
Patients with progressive remodeling are at increased risk of sudden death in chronic MI. Cardiac electrical instability is closely related to progressive LV dilation. Parameters of electrical instability and remodeling are predictors of sudden death. The findings suggest that remodeling might serve as a link between dysfunction, electrical instability of the heart and sudden death after MI.