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[Anatomo-functional substrate of high risk arrhythmia after myocardial infarct]
R Ruiz Granell1, A Querchfeld, R García Civera
1Servicio de Cardiología, Hospital Clínico Universitario, Valencia.
Insights
Significant ventricular arrhythmias after myocardial infarction are linked to a history of hypertension and higher systolic pressures. These arrhythmias are a risk factor for sudden death, independent of ventricular function.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Context:
- Ventricular arrhythmias post-myocardial infarction (MI) predict sudden death.
- Prognostic value of these arrhythmias is independent of ventricular function.
- Associations with clinical, hemodynamic, and angiographic factors remain unclear.
Purpose:
- To investigate hypothetical associations between ventricular arrhythmias and clinical, hemodynamic, and angiographic variables in post-MI patients.
- To compare patients with and without significant ventricular arrhythmias (≥10 PVCs/hour or repetitive forms).
Summary:
- 60 post-MI patients underwent Holter monitoring and cardiac catheterization 3-5 weeks after admission.
- Significant ventricular arrhythmias occurred in 25% of patients.
- Hypertension history (53.3% vs 17.8%) and higher systolic pressures were associated with arrhythmias; no differences in infarct location, acute complications, or coronary anatomy were found.
Impact:
- Identifies arterial hypertension history and elevated systolic pressures as potential risk factors for ventricular arrhythmias post-MI.
- Highlights the need for further research into the relationship between these factors and sudden cardiac death risk.
- Contributes to understanding the multifactorial nature of post-MI arrhythmias.
Abstract:
Ventricular arrhythmias detected in the late-hospital phase of myocardial infarction have been identified as a risk factor for sudden death, being their prognostic value independent of ventricular function. However, relations between both factors are not clarified. In order to study hypothetic associations between ventricular arrhythmias and some clinical, hemodynamic and angiographic variables, 60 patients (52 males, 8 females) underwent 24-hour Holter recordings and cardiac catheterization with left ventricular and coronary angiographies, 3-5 weeks after hospital admission. Past history data, acute phase complications and hemodynamic and angiographic results were compared between patients with and without significant ventricular arrhythmias during Holter monitoring (10 or more PVC's/hour and/or repetitive forms). No significant differences were found between both groups neither in mean age nor in the incidence of previous angina or infarction, cerebral ischemia, diabetes, lipid disorders or subjective feeling of being under psychological stress. Prior history of arterial hypertension was, however, significantly more frequent in patients with ventricular arrhythmias (53.3% vs 17.8%; p = 0.0183). No differences were observed in the localization of the infarct or in the complications during the acute phase (CPK peak, Killip's score, angina after 24 hours of evolution, intraventricular or A-V conduction disorders and supraventricular and ventricular arrhythmias). Among hemodynamic data, only left ventricular and aortic systolic pressures were different in both groups, being significantly higher in patients with ventricular arrhythmias. There were not differences in left ventricular segmentary contraction and in number of coronary vessels involved. To conclude, significant ventricular arrhythmias were recorded in 25% of patients.(ABSTRACT TRUNCATED AT 250 WORDS)