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[Arrhythmia in acute myocardial infarction with involvement of the right ventricle]
M Córdoba Tejada1, A Olivares, J A González-Hermosillo
1Instituto Nacional de Cardiología Ignacio Chávez, México, D.F.
Insights
Right ventricular infarction significantly increases the risk of arrhythmias and conduction disorders, leading to more pacemaker implants and higher mortality compared to isolated inferior myocardial infarction.
Area of Science:
- Cardiology
- Electrophysiology
- Myocardial Infarction Research
Context:
- Investigating cardiac arrhythmias and conduction disturbances in patients with myocardial infarction.
- Focusing on the specific impact of right ventricular involvement in posteroinferior myocardial infarction.
Purpose:
- To compare the incidence and types of arrhythmias and conduction disorders in patients with and without right ventricular involvement during posteroinferior myocardial infarction.
- To assess the implications for pacemaker implantation and patient mortality.
Summary:
- Patients with right ventricular infarction experienced significantly higher rates of conduction disturbances (68% vs. 20%), including atrioventricular block and intraventricular conduction defects like right bundle branch block.
- Ventricular arrhythmias, such as ventricular fibrillation and torsades de pointes, were also more prevalent in the right ventricular infarction group.
- A greater need for pacemaker implantation (62 vs. 12) and increased mortality (23 vs. 2) were observed in patients with right ventricular involvement, though deaths were not attributed to arrhythmias.
Impact:
- Highlights the critical role of right ventricular involvement in posteroinferior myocardial infarction, leading to more severe conduction system damage.
- Underscores the increased risk of significant arrhythmias and the need for interventions like pacemakers in this patient subgroup.
- Provides evidence for more aggressive monitoring and management strategies for patients with right ventricular infarction.
Abstract:
Arrhythmias and conduction disorders were studied in 110 patients with posteroinferior myocardial infarction with right ventricular involvement. All the patients were hospitalized in the coronary care unit, and were compared with another 110 patients with posteroinferior myocardial infarction without extension to the right ventricle. 99% of the patients with right ventricular infarction and 96.3% of the patients with isolated inferior infarction had some type of arrhythmia. The disorders of automatism were similar in both groups (90% vs 91%, respectively). The conduction disturbances were observed in 68% of the infarctions extended to the right ventricle and in 20% of the isolated left ventricular infarctions (p greater than 0.01). A-V block occurred in 52% of the infarctions with right ventricular involvement and only in 10.9% of the control group. Intraventricular conduction disorders also were more frequent in right ventricular infarction (24.5% vs 10.9%) (p less than 0.02), especially the RBBB (18.2% vs 6.4%). Ventricular fibrillation was observed in 5.5% and 0.9%, and polymorphic ventricular tachycardia (torsades de pointes) in 12.7% and 1.9% respectively. In 62 patients with right ventricular infarction it was necessary to implant a pacemaker as compared to 12 patients in the control group. Mortality was higher in the patients with inferior infarction extended to the right ventricle (23 patients vs 2 patients). None of the deaths were due to arrhythmias. It can be concluded that conduction disorders and the number of pacemaker implants are more common in the infarctions with right ventricular involvement due to more severe damage to the conduction system.