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[The complex assessment of myocardial electrical instability in exacerbated ischemic heart disease]
Insights
Sudden coronary death risk in unstable angina patients requires comprehensive assessment. Combining Holter monitoring, stress tests, and programmed ventricular stimulation is crucial for evaluating myocardial electric stability.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Background:
- Unstable angina poses a significant risk for sudden coronary death.
- Current methods for assessing myocardial electric stability in these patients are insufficient.
- Understanding the mechanisms of ventricular arrhythmias is critical.
Purpose of the Study:
- To investigate the risk of sudden coronary death in patients with unstable angina.
- To evaluate the utility of programmed ventricular stimulation in assessing myocardial electric stability.
- To explore the correlation between different diagnostic methods for ventricular arrhythmias.
Main Methods:
- Holter's monitoring
- Loading tests
- Invasive programmed ventricular stimulation
- Study included 39 patients with unstable angina.
Main Results:
- Programmed stimulation identified ventricular tachycardia in 56.4% of patients.
- No correlation was found between Holter monitoring, loading tests, and programmed stimulation results.
- Arrhythmias during Holter monitoring were often linked to ischemia, but ischemia was not always present during programmed stimulation.
Conclusions:
- A multifaceted approach is necessary for assessing myocardial electric stability in unstable angina.
- Different methods may reflect distinct pathogenetic mechanisms of ventricular arrhythmias.
- Further research is needed to refine risk stratification for sudden coronary death in this population.
Abstract:
Risk of sudden coronary death in patients with unstable stenocardia is studied insufficiently. 39 patients with unstable stenocardia underwent Holter's monitoring, loading tests and invasive programmed ventricular stimulation coming lately into increasingly wide use for assessment of myocardial electric stability. Programmed stimulation allowed to single out two groups of patients: with ventricular tachycardia (56.4%) and without it (43.6%). Results obtained by aforementioned methods showed no correlation which is explained by the authors as being due to different pathogenetical mechanisms initiating ventricular arrhythmias. Thus, for example, rhythm disorders emerged not infrequently in the periods of ischemia during Holter's monitoring while myocardial ischemia was not observed in all cases of programmed ventricular stimulation. That is why complex approach needs to be pursued for assessment of electric stability of myocardium in patients with advancing stenocardia.