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Spontaneous reperfusion in ST-elevation myocardial infarction: comparison of angiographic and electrocardiographic
Kevin R Bainey1, Yuling Fu, Galen S Wagner
1University of Alberta, Edmonton, Alberta, Canada.
Insights
Electrocardiogram (ECG) assessment of spontaneous reperfusion in ST-elevation myocardial infarction better predicts clinical outcomes than angiographic assessment. ECG-based spontaneous reperfusion is linked to improved survival and reduced adverse events.
Area of Science:
- Cardiology
- Interventional Cardiology
- Myocardial Infarction Research
Background:
- Spontaneous reperfusion (SR) in ST-elevation myocardial infarction (STEMI) is crucial for patient outcomes.
- Traditional assessment of SR relies on coronary angiography, but its frequency and clinical significance in the modern reperfusion era remain unclear.
- This study systematically evaluated SR using both electrocardiographic (ECG) and angiographic methods in STEMI patients undergoing primary percutaneous coronary intervention (PCI).
Purpose of the Study:
- To compare the frequency and clinical implications of spontaneous reperfusion (SR) assessed by electrocardiography (ECG) versus coronary angiography in ST-elevation myocardial infarction (STEMI) patients.
- To determine which method of SR assessment better correlates with 30-day clinical outcomes.
- To evaluate the role of ECG in assessing myocardial reperfusion post-primary PCI.
Main Methods:
- Analysis of data from the ASSENT 4 PCI study, focusing on 585 patients randomized to primary PCI.
- Assessment of ECG-derived SR (≥70% ST-segment resolution) and angiographic SR (Thrombolysis In Myocardial Infarction [TIMI] grade 3 flow) approximately 60 minutes post-randomization and pre-PCI.
- Comparison of 30-day clinical outcomes (mortality, death/shock/congestive heart failure, death/reinfarction) between patients with and without SR, stratified by assessment method (ECG vs. angiography).
Main Results:
- The frequency of SR was similar whether assessed by ECG (14.9%) or angiography (14.7%).
- Patients with ECG-defined SR showed a trend towards lower mortality (0% vs. 3.4%) and significantly lower death/reinfarction rates (0% vs. 5.6%, P=.014) compared to those without ECG SR.
- No significant differences in clinical outcomes were observed between patients with and without angiographic SR.
Conclusions:
- Electrocardiographic assessment of SR appears to be a more reliable predictor of clinical outcomes in STEMI patients compared to angiographic assessment.
- The findings support the utility of the ECG in evaluating myocardial reperfusion, likely reflecting overall myocardial perfusion rather than solely epicardial artery patency.
- ECG criteria for SR may offer a more clinically relevant measure of reperfusion success in the context of primary PCI.
Introduction:
Spontaneous reperfusion (SR) in ST-elevation myocardial infarction has traditionally been assessed by coronary angiography. The frequency of SR varies widely in prior studies, and the clinical implications in the modern reperfusion era are unclear. Accordingly, using data from the ASSENT 4 PCI (ASsessment of the Safety and Efficacy of a New Treatment Strategy with Percutaneous Coronary Intervention) study, we undertook a systematic assessment of SR using both electrocardiographic (ECG) and angiographic techniques.
Methods And Results:
Five hundred eighty-five patients randomized to the primary percutaneous coronary intervention (PCI) arm of ASSENT 4 PCI were studied: all had ECG and thrombolysis in myocardial infarction flow data available approximately 60 minutes after randomization and before PCI. Electrocardiographic SR (>/=70% ST-segment resolution) occurred in 14.9% (87/585) and angiographic SR (thrombolysis in myocardial infarction grade 3) in 14.7% (86/585) of patients. Thirty-day clinical outcomes of patients with ECG SR versus no ECG SR tended to have lower mortality (0% vs 3.4%, P = .091), a lower composite of death/shock/congestive heart failure (6.9% vs 12.2%, P = .148), and significant reductions in death/reinfarction (0% vs 5.6%, P = .014). By contrast, no such differences were evident in patients with angiographic SR versus no SR for death (2.3% vs 3.0%, P = 1.00), death/shock/congestive heart failure (9.3% vs 11.8%, P = .498), or death/reinfarction (2.3% vs 5.2%, P = .409).
Conclusions:
Whereas the frequency of SR was comparable using either ECG or angiographic criteria, clinical outcomes were best aligned with ECG SR. These data support the role of the ECG in assessing reperfusion and likely reflect the overall impact of myocardial perfusion versus infarct-related artery epicardial patency alone.
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