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Criteria for Acute MI
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Criteria for Acute MI
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Criteria for Acute MI
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Criteria for Acute MI
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Criteria fห้องสมุดไป่ตู้r Prior MI
心肌梗死全球统一定义 与影像学诊断
何作祥
中国医学科学院阜外心血管病医院
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Thygesen, K. et al. Circulation 2007;116:2634-
2653
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Criteria for Acute MI
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Criteria for Acute MI
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Electrocardiographic Detection of Myocardial Infarction
Coronary artery dominance, size and distribution of arterial segments, collateral vessels, and location, extent, and severity of coronary stenoses can also impact ECG manifestations of myocardial ischemia.
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Electrocardiographic Detection of
Myocardial Infarction
The ECG by itself is often insufficient to diagnose acute myocardial ischemia or infarction since ST deviation may be observed in other conditions such as acute pericarditis, LV hypertrophy, LBBB, Brugada syndrome, and early repolarization patterns. Also Q-waves may occur due to myocardial fibrosis in the absence of coronary artery disease, as in, for example, cardiomyopathy.
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医学课件Tphpytgesen, K. et al. Circulation 2007;116:2634-2653 10
Biomarker Evaluation
The preferred biomarker for myocardial necrosis is cardiac troponin (I or T), which has nearly absolute myocardial tissue specificity as well as high clinical sensitivity, thereby reflecting even microscopic zones of myocardial necrosis.
The ECG is an integral part of the diagnostic work-up of patients with suspected myocardial infarction.
The acute or evolving changes in the ST-T waveforms and the Q-waves when present potentially allow the clinician to date the event, to suggest the infarct-related artery, and to estimate the amount of myocardium at risk.
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Imaging Techniques
The underlying rationale is that regional myocardial hypoperfusion and ischemia lead to a cascade of events including myocardial dysfunction, cell death, and healing by fibrosis.
Important imaging parameters are therefore perfusion, myocyte viability, myocardial thickness, thickening, and motion, and the effects of fibrosis on the kinetics of radiolabeled and paramagnetic contrast agents.
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Echocardiography
Echocardiography is an excellent real-time imaging technique with moderate spatial and temporal resolution. Its strength is the assessment of myocardial thickness, thickening, and motion at rest. This can be aided by tissue Doppler imaging. Echocardiographic contrast agents can improve endocardial visualization, but contrast studies are not yet fully validated for the detection of myocardial necrosis, although early work is encouraging.
If troponin assays are not available, the best alternative is CKMB (measured by mass assay).
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Electrocardiographic Detection of Myocardial Infarction