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Estimation of infarct size using serum troponin T concentration in patients with acute myocardial infarction
1Department of Internal Medicine, Osaka City University Medical School, Japan.
Insights
Late serum troponin T peak concentration accurately predicts myocardial infarction size. This finding holds true regardless of when troponin T levels peak after the heart attack, aiding in infarct size estimation.
Area of Science:
- Cardiology
- Biomarkers
- Medical Imaging
Background:
- Estimating myocardial infarction (MI) size is crucial for prognosis and treatment.
- Serum troponin T is a key biomarker for MI, but its peak concentration kinetics can vary.
- Non-invasive imaging techniques are used to assess cardiac function and damage post-MI.
Purpose of the Study:
- To evaluate the correlation between late serum troponin T peak concentration and myocardial infarct size.
- To determine if troponin T peak timing affects its utility in predicting infarct size.
Main Methods:
- Serum troponin T levels were measured in 34 acute MI patients.
- Left ventriculography, 2D echocardiography, and 201thallium SPECT were performed ~4 weeks post-MI.
- Correlations were assessed between late troponin T peak values (days 3-5) and imaging-derived infarct size metrics.
Main Results:
- Left ventricular ejection fraction (LVEF) and wall motion index (WMI) showed inverse correlations with late troponin T peak (r=0.68, r=0.70).
- 201thallium SPECT extent score (ES) and severity score (SS) demonstrated excellent linear correlations with late troponin T peak (r=0.77, r=0.66).
- These correlations were consistent in patients with early (day 1) and delayed troponin T peaks.
Conclusions:
- Late serum troponin T peak concentration is a reliable predictor of myocardial infarct size.
- Infarct size estimation using late troponin T peak is independent of the timing of its peak serum concentration.
- This finding supports the use of late troponin T levels for assessing MI severity.
Abstract:
To estimate the size of myocardial infarction, serum troponin T concentration was measured in 34 patients with acute myocardial infarction. Left ventriculography, 2-dimensional echocardiography and resting 201thallium myocardial single photon emission computed tomography (SPECT) were performed about 4 weeks after the onset of myocardial infarction and used for correlation with the late serum troponin T peak concentration which occurred on the 3rd to 5th day after onset. Both left ventricular ejection fraction (LVEF) obtained from left ventriculography and wall motion index (WMI) obtained from 2-dimensional echocardiography were inversely related to late troponin T peak value (LVEF: r = 0.68, p < 0.001, WMI: r = 0.70, p < 0.001). Extent score (ES) and severity score (SS), which were estimated from the initial resting 201thallium SPECT image, showed excellent linear correlations with late troponin T peak concentrations (ES: r = 0.77, p < 0.001, SS: r = 0.66, p < 0.001). This correlation was present both in patients with an early troponin T peak on day 1 (group A-16 patients) and in those without an early peak (group B-10 patients). Thus, late troponin T peak concentration can be used to predict infarct size regardless of the kinetics of its appearance in serum.