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[Significance of the persistence of ST segment elevation in anterior infarction]
F Matias1, A R de Almeida, J Carvalho
1Hospital de Pulido Valente.
Insights
Persistent ST segment elevation in anterior myocardial infarction indicates worse left ventricular function and more severe wall motion abnormalities. Ventricular aneurysm was only found in patients with ST segment elevation.
Area of Science:
- Cardiology
- Clinical Medicine
- Medical Research
Context:
- Persistent ST segment elevation in anterior myocardial infarction was historically linked to ventricular aneurysm, a notion now debated.
- Assessing the relationship between electrocardiographic findings and left ventricular function is crucial in managing myocardial infarction.
Purpose:
- To investigate the association between persistent ST segment elevation and left ventricular wall motion abnormalities and global function in patients with anterior myocardial infarction.
Summary:
- A retrospective study of 94 anterior myocardial infarction patients found persistent ST segment elevation in 60%.
- This group exhibited significantly depressed ejection fraction (36.2% vs. 49.3%) and more severe left ventricular asynergy (75% vs. 32%) compared to those with isoelectric ST segments.
- Ventricular aneurysm was exclusively observed in patients with persistent ST segment elevation.
Impact:
- Findings suggest persistent ST segment elevation is a marker for impaired left ventricular function and severe asynergy post-anterior myocardial infarction.
- This electrocardiographic pattern may aid in identifying patients at higher risk for adverse cardiac events.
- The study refines the understanding of ST segment behavior in myocardial infarction, moving beyond the traditional aneurysm association.
Objective:
Persistent ST segmentary elevation in anterior myocardial infarction was classically attributed to ventricular aneurysm. This association is now considered controversial. We studied the association between this electrocardiographic finding and the left ventricular wall motion abnormalities and global function.
Design:
Retrospective study.
Setting:
Patients admitted to Hospital de Pulido Valente Coronary Care Unit in Lisbon with anterior myocardial infarction who were submitted to angiographic study.
Patients:
94 patients were included in the study.
Methods:
The global ejection fraction, the regional wall motion abnormalities, the coronary artery disease extension, the patency and the proximal involvement of the left anterior descending artery were investigated.
Results:
56 of the 94 patients (60%) had persistent ST segment elevation and 38 (40%) had isoelectric ST segment. The ejection fraction was markedly depressed in the group with elevated ST segment (36.2 SD 17.6) in contrast with the group with isoelectric ST segment (49.3 SD 14.8) (p < 0.001). The group with persistent ST segment elevation had more advanced degrees of left ventricular asynergy (42/58-75%) than the group with isoelectric ST segment (12/38-32%) (p = 0.02). The other studied angiographic variables did not differ between the two groups.
Conclusions:
The group with persistent ST segment elevation was associated with advanced degrees of left ventricular asynergy and greater left ventricular function depression. The ventricular aneurysm was exclusive of the first group.