[Device therapy after acute coronary syndrome]

Area of Science:

• Cardiology
• Electrophysiology

Context:

• Acute coronary syndromes (ACS) are infrequently associated with high-degree atrioventricular (AV) blocks.
• Ventricular tachyarrhythmias are common during acute myocardial infarctions (MIs).

Purpose:

• To outline management strategies for cardiac arrhythmias complicating acute coronary syndromes.
• To define criteria for device implantation in post-MI patients.

Summary:

• High-degree AV blocks in ACS rarely necessitate permanent pacemaker implantation.
• Sustained ventricular tachycardia (VT) or ventricular fibrillation (VF) beyond 48 hours post-MI indicates implantable cardioverter-defibrillator (ICD) need.
• ICD for primary prophylaxis may be considered if left ventricular ejection fraction remains ≤35% for over 40 days.
• Biventricular stimulation is recommended for early device implantation if ventricular pacing is required or LBBB with prolonged QRS is present.

Impact:

• Provides guidance on appropriate device therapy for complex cardiac arrhythmias after MI.
• Aims to optimize patient outcomes by stratifying risk for sudden cardiac death.