[Persistent ST segment elevation in anterior wall myocardial infarction: a sign of ventricular dysfunction]

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Persistent ST segment elevation in anterior myocardial infarction was historically linked to ventricular aneurysm, a connection now debated.
• This study investigates the relationship between persistent ST elevation, left ventricular aneurysm, and cardiac function.

Purpose of the Study:

• To assess the association between persistent ST segment elevation and left ventricular aneurysm in patients with anterior myocardial infarction.
• To evaluate the impact of persistent ST segment elevation on left ventricular function (ejection fraction).

Main Methods:

• Cardiac catheterization was performed on 85 patients with chronic anterior wall myocardial infarction.
• Left ventricular ejection fraction and the presence of ventricular aneurysm were assessed.
• Findings were correlated with the persistence of ST segment elevation on electrocardiography.

Main Results:

• 66% of patients exhibited persistent ST segment elevation; 34% had an isoelectric ST segment.
• Left ventricular aneurysm was found in 57% of patients with elevated ST segments, but none with isoelectric ST segments.
• Ejection fraction was significantly lower in the elevated ST segment group (0.34 ± 0.13) compared to the isoelectric ST segment group (0.52 ± 0.11), irrespective of aneurysm presence.

Conclusions:

• Persistent ST segment elevation in anterior myocardial infarction is strongly associated with impaired left ventricular function.
• Left ventricular aneurysm is a common and exclusive finding in patients with persistent ST segment elevation.
• The degree of left ventricular dysfunction is independent of aneurysm presence, suggesting ST elevation as a marker of myocardial damage severity.