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[Saved myocardium in acute ST-segment elevation myocardial infarction post-reperfusion: Analysis by cardiac magnetic
Rienzi Díaz-Navarro1, Tamara Sáez1, Felipe Peirano2
1Departamento de Medicina Interna, Escuela de Medicina, Universidad de Valparaíso, Chile.
Insights
Primary angioplasty significantly salvages more myocardium in ST-segment elevation myocardial infarction (STEMI) patients compared to thrombolysis or no reperfusion. Cardiovascular magnetic resonance effectively quantifies this salvaged heart muscle.
Area of Science:
- Cardiology
- Medical Imaging
- Interventional Cardiology
Background:
- ST-segment elevation myocardial infarction (STEMI) is a critical condition requiring prompt reperfusion.
- Assessing myocardial salvage is crucial for determining treatment efficacy and patient prognosis.
- Non-reperfused, thrombolysis, and primary angioplasty represent different management strategies for STEMI.
Purpose of the Study:
- To quantify salvaged myocardium in the infarct-related artery territory of STEMI patients.
- To compare myocardial salvage between reperfused (thrombolysis, primary angioplasty) and non-reperfused STEMI patients.
- To evaluate the role of cardiovascular magnetic resonance (CMR) in assessing myocardial viability post-STEMI.
Main Methods:
- Twenty-five first STEMI patients were studied (10 non-reperfused, 10 thrombolysis, 5 primary angioplasty).
- Cardiac magnetic resonance imaging was performed 3-6 days post-coronary angiography.
- Myocardial salvage mass and myocardial salvage index were quantified using CMR.
Main Results:
- Primary angioplasty patients showed significantly lower peak troponin levels and smaller infarct sizes compared to thrombolysis and non-reperfused groups.
- Myocardial salvage mass was significantly higher in primary angioplasty patients (27.4g) versus thrombolysis (4.7g) and non-reperfused (2.1g) groups.
- Myocardial salvage index was markedly greater in primary angioplasty patients (65.2%) compared to thrombolysis (14.9%) and non-reperfused (6.6%) groups.
Conclusions:
- Primary angioplasty demonstrates superior myocardial salvage in STEMI patients.
- The findings necessitate a re-evaluation of current reperfusion strategies for STEMI.
- CMR is a valuable tool for quantifying salvaged myocardium and assessing early myocardial viability.
Objective:
To quantify by cardiovascular magnetic resonance the salvaged myocardium in the myocardium supplied by the infarct-related artery in reperfused and non-reperfused patients with a first ST-segment elevation myocardial infarction (STEMI).
Patients And Method:
Twenty-five patients with a first STEMI (non-reperfused, ten patients; thrombolysis, ten patients; primary angioplasty, five patients) underwent cardiac magnetic resonance imaging 3 to 6 days after coronary angiography. Myocardial salvage and myocardial salvage index were quantified.
Results:
Peak troponin values were lower in patients with primary angioplasty than in thrombolysis and non-reperfused patients (14,1 ng/ mL versus 515,4 ng/mL and 123,1 ng/mL, respectively; p < 0,007) and smaller infarct size (14,1 g versus 31,2 g and 31,5 g, respectively; p < 0,003). Myocardial salvage mass and myocardial salvage index were higher in patients with primary angioplasty than in thrombolysis and non-reperfused patients (27,4 g versus 4,7 g and 2,1 g, respectively; p < 0,003) and (65,2% versus 14,9% and 6,6%, respectively; p < 0,0001).
Conclusions:
The results of this study indicate the need to reassess the performance of coronary angioplasty and stent implantation in patients with a first STEMI, thrombolysis, and non-thrombolysis without prior myocardial viability studies. Cardiac magnetic resonance allows the quantification of salvaged myocardium and could be considered an emerging clinical application for the early evaluation of myocardial viability.
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