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[Myocardial ischemia and ventricular arrhythmia]
1Heinrich-Heine-Universität Düsseldorf Medizinische Klinik und Poliklinik B Klink für Kardiologie, Pneumologie und Angiologie.
Zeitschrift Fur Kardiologie
|November 25, 1998
Summary
Myocardial ischemia is linked to ventricular arrhythmias in coronary heart disease patients. Metabolic and electrophysiological tests reveal distinctions, identifying "hibernating" or "mismatch" zones as potential risk factors for sudden cardiac death.
Area of Science:
- Cardiology and Electrophysiology
- Cardiac Metabolism
- Myocardial Ischemia Research
Context:
- Coronary heart disease (CHD) patients exhibit a relationship between myocardial ischemia and ventricular arrhythmias, unlike those with non-ischemic cardiac conditions.
- Combined metabolic-electrophysiological protocols, including programmed stimulation and metabolic analysis, differentiate between ischemic and non-ischemic heart disease.
- Resting and stress conditions reveal significant metabolic distinctions in patients with ischemic heart disease.
Purpose:
- To investigate the relationship between myocardial ischemia and the induction of ventricular arrhythmias in patients with coronary heart disease.
- To identify metabolic and electrophysiological markers differentiating patients with and without ventricular arrhythmias.
- To explore the role of "hibernating myocardium" and "mismatch" zones as risk factors for arrhythmic events and sudden cardiac death.
Summary:
- Patients with coronary heart disease and ventricular arrhythmias (VT/VF) more frequently present with "hibernating myocardium" or "mismatch" zones compared to those without arrhythmias.
- These zones, characterized by reduced perfusion and preserved metabolism, are identified via scintigraphic SPECT/PET studies and may indicate a risk for sudden cardiac death post-myocardial infarction.
- Monomorphic reentrant VT originates in scarred border zones with "match" patterns (reduced perfusion and metabolism), contrasting with polymorphic VT/VF linked to acute-on-chronic ischemia.
Impact:
- Findings suggest that "hibernating" or "mismatch" zones are potential risk factors for arrhythmic events and sudden cardiac death after myocardial infarction.
- Understanding the interplay between acute and chronic ischemia is crucial for managing polymorphic ventricular tachycardia/fibrillation.
- Interventional therapies (ablation, surgery, ICD) are often necessary for controlling VT foci, while anti-ischemic treatment is effective for a subset of patients.