Atrial myocardial infarction: A tale of the forgotten chamber

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Atrial infarction, first described nearly a century ago, remains poorly understood with limited data on its clinical significance.
• Universally accepted diagnostic criteria for atrial infarction are still lacking.
• Atherosclerosis is the primary cause, but it can also occur in cor pulmonale and pulmonary hypertension.

Purpose of the Study:

• To review the current understanding of atrial infarction, including its causes, clinical presentation, diagnostic challenges, and management.
• To highlight the limitations in current diagnostic criteria and the need for validation.

Main Methods:

• Literature review of studies on atrial infarction.
• Analysis of electrocardiographic (ECG) patterns associated with atrial infarction.
• Discussion of clinical presentations and complications.

Main Results:

• Atrial infarction often co-occurs with ventricular infarction, with presentation varying based on ventricular involvement.
• Potential ECG findings include abnormal P-wave morphologies, PR-segment deviations, and various supraventricular tachyarrhythmias (e.g., atrial fibrillation, flutter, tachycardia) and AV blocks.
• Complications encompass thromboembolic events and cardiogenic shock.

Conclusions:

• Despite its long history, atrial infarction requires further research to establish validated diagnostic criteria.
• Current management focuses on coronary reperfusion and rhythm control, as no specific guidelines exist for atrial involvement in myocardial infarction.