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Rapid reduction of ST-segment elevation after successful direct angioplasty in acute myocardial infarction
G M Santoro1, D Antoniucci, R Valenti
1Division of Cardiology, Careggi Hospital, Viale Morgagni, and the Institute of General Pathology, University of Florence, Italy.
Insights
Early ST-segment elevation reduction after angioplasty predicts better outcomes in acute myocardial infarction (AMI) patients. This simple ECG assessment identifies those most likely to benefit from reperfusion therapy, guiding clinical decisions.
Area of Science:
- Cardiology
- Clinical Medicine
- Medical Diagnostics
Background:
- Acute myocardial infarction (AMI) requires prompt reperfusion therapy.
- Assessing myocardial damage and functional recovery post-intervention is crucial.
- Electrocardiogram (ECG) monitoring is a standard diagnostic tool.
Purpose of the Study:
- To determine if ST-segment changes on ECG predict myocardial damage and functional recovery.
- To evaluate the utility of early ST-segment analysis post-angioplasty in AMI patients.
- To identify patients who benefit most from reperfusion therapy.
Main Methods:
- Prospective study of 117 AMI patients undergoing direct coronary angioplasty.
- Classification into two groups based on ST-segment elevation reduction (<50% vs. >=50%) 30 minutes post-procedure.
- Assessment of peak creatine kinase, infarct zone wall motion score index, and left ventricular ejection fraction at one month.
Main Results:
- Patients with >=50% ST-segment reduction showed significantly lower peak creatine kinase levels.
- Greater improvement in infarct zone wall motion score index and higher ejection fraction were observed in the >=50% reduction group.
- Functional recovery was significantly higher (78% vs. 34%) in patients with >=50% ST-segment reduction.
Conclusions:
- ST-segment elevation reduction is a strong independent predictor of functional recovery post-angioplasty in AMI.
- Early ECG ST-segment analysis provides rapid, cost-effective information for patient stratification.
- This method helps identify patients likely to achieve maximal benefit from reperfusion therapy.
Abstract:
The aim of this study was to evaluate whether assessment of ST-segment changes in the 12-lead electrocardiogram from admission to 30 minutes after successful direct coronary angioplasty can predict myocardial damage and functional outcome in patients with acute myocardial infarction (AMI). Of 158 consecutive patients, 117 (92 men, aged 61 +/- 11 years) were prospectively classified into 2 groups: group 1, <50% reduction in ST-segment elevation in a single selected lead (42 patients); group 2, > or =50% reduction in ST-segment elevation (75 patients). Baseline characteristics were similar except for anterior wall AMI and Killip class >2, which were more prevalent in group 1. Peak creatine kinase was significantly higher in group 1 (3,690 +/- 2,809 vs 2,592 +/- 1,960 U/L; p = 0.018). One-month echocardiograms were obtained in 102 patients (87%). Infarct zone wall motion score index decreased in both groups, but this reduction was higher in group 2 (p <0.001). Functional recovery (>0.22 decrease in infarct zone wall motion score index) was observed in 34% of group 1 and in 78% of group 2 patients (p <0.001). One-month left ventricular ejection fraction was higher in group 2 (p <0.001). At multivariate analysis, reduction of ST-segment elevation was the only independent predictor of functional recovery (p <0.001). In conclusion, ST-segment analysis provides rapid and inexpensive information allowing identification of patients who are likely to benefit the most from myocardial reperfusion as early as 30 minutes after the last balloon inflation.