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[Treatment of postinfarction ventricular tachycardia based on the results of programmed stimulation]
1Okresní ústav národního zdraví Prostĕjov, vnitrní oddĕlení.
Insights
Serial drug testing using programmed stimulation effectively identified antiarrhythmic treatments for 80% of patients with post-infarction ventricular tachycardia, significantly reducing adverse events.
Area of Science:
- Cardiology
- Electrophysiology
- Pharmacology
Context:
- Significant post-infarction ventricular tachycardia poses a high risk of sudden cardiac death.
- Effective antiarrhythmic drug selection is crucial for managing these arrhythmias.
- Programmed electrical stimulation is a key diagnostic tool in electrophysiology.
Purpose:
- To evaluate the efficacy of serial antiarrhythmic drug testing using programmed electrical stimulation in patients with significant post-infarction ventricular tachycardia.
- To assess the predictive value of this testing method for long-term outcomes.
- To determine the optimal treatment protocol for managing ventricular arrhythmias post-myocardial infarction.
Summary:
- Serial testing of antiarrhythmic agents (Class I and III or combination) via programmed pacing identified effective treatments in 80% of 21 patients with significant post-infarction ventricular tachycardia.
- Patients receiving effective treatment showed no significant ventricular tachycardias or sudden deaths during follow-up, unlike the control group.
- The method demonstrated 90% accuracy in predicting long-term outcomes, including ventricular tachycardia and sudden death.
Impact:
- Serial drug testing with programmed stimulation is an effective strategy for selecting antiarrhythmic therapies in post-MI VT patients.
- This approach significantly lowers the incidence of serious ventricular arrhythmic events and sudden cardiac death.
- The findings support the use of this protocol for personalized antiarrhythmic drug management in high-risk cardiac patients.
Abstract:
Serial testing of antiarrhythmic agents (group I and III or their combination) by means of programmed pacing using a simple protocol (1-3 premature stimuli during stimulation from the apex of the right ventricle at a rate of 100 [120] and 140/min) and milder criteria of the effectiveness of treatment (does not produce significant ventricular tachycardias of a frequency above 150/min and with a duration longer than 30 s) was performed in 21 patients with significant post-infarction ventricular tachycardia (same definition of significance). Effective treatment was found in serial testing in 17 patients, i.e. in 80%. According to the results of serial test and long-term adherence to treatment the patients were divided into two groups. Group I comprised 14 patients taking effective treatment up to the completion of the investigation and group II, seven patients, where effective treatment was not revealed during testing (4 patients) or was discontinued because of side-effects (3 patients). During long-term follow up (15.2 +/- 13.5 months) no significant ventricular tachycardias or sudden deaths were recorded in group I but in five patients of group II P less than 0.0003). A correct prediction of ventricular tachycardia or sudden death during long-term treatment was made in 19 patients, i.e. 90%. Serial testing of drugs by programmed stimulation is thus, when the above stimulation protocol is used in patients with significant ventricular tachycardia and with a myocardial infarction in the case-history, an effective method leading to a relatively low incidence of serious ventricular arrhythmic attacks.