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Permanent pacing in patients with transient trifascicular block during acute myocardial infarction
Insights
Patients with acute myocardial infarction and transient atrioventricular (A-V) block, along with specific heart blocks, face high sudden death risk. Prophylactic pacemakers significantly improve survival in this high-risk group.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Patients experiencing acute myocardial infarction (MI) with transient complete atrioventricular (A-V) block, right bundle branch block, and left anterior hemiblock are at high risk for late sudden death.
- Recurrent A-V block is presumed to be the cause of sudden death in this patient subgroup.
Purpose of the Study:
- To evaluate the impact of prophylactic permanent pacing on the prognosis of patients who survive acute myocardial infarction with transient complete A-V block, right bundle branch block, and left anterior hemiblock.
Main Methods:
- A retrospective study over 5 years identified 18 patients with acute MI, transient complete A-V block, right bundle branch block, and left anterior hemiblock who survived to hospital discharge.
- Outcomes were compared between a group of six patients who did not receive permanent pacing and twelve subsequent patients who received permanent demand pacemakers.
Main Results:
- Five out of six patients (83%) without permanent pacing died suddenly within a mean of 2.4 months post-discharge.
- Twelve patients who received permanent pacemakers showed significantly improved prognosis, with a mean survival time of 18 months (P < 0.001).
- Six patients with pacemakers were alive at an average follow-up of 20 months.
Conclusions:
- Prophylactic permanent pacemaker implantation significantly improves survival rates in select patients following acute myocardial infarction complicated by transient complete A-V block, right bundle branch block, and left anterior hemiblock.
- This intervention mitigates the high risk of sudden cardiac death in this specific high-risk subgroup.
Abstract:
Patients with acute myocardial infarction and transient complete atrioventricular (A-V) block in association with right bundle branch block and left anterior hemiblock have a high incidence rate of late sudden death presumably due to recurrent A-V block. Over a 5 year period, 18 patients demonstrated right bundle branch block and left anterior hemiblock and had transient complete block during an acute myocardial infarction and survived to hospital discharge. Of six patients who did not have permanent pacing, five died suddenly (one was lost to follow-up) with a mean survival time of 2.4 months after hospital discharge. Twelve subsequent patients received permanent demand pacemakers and had a significantly improved prognosis with a mean survival time of 18 months (P less than 0.001). Six patients were still alive at an average follow-up time of 20 months. Prophylactic permanent pacing significantly improves the prognosis after acute myocardial infarction in this select subgroup of patients.