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Troponin T measurement after myocardial infarction can identify left ventricular ejection of less than 40%
A C Rao1, P O Collinson, R Canepa-Anson
1Department of Cardiology, Mayday University Hospital, Croydon, Surrey, UK.
Insights
Serum troponin T levels after myocardial infarction reliably identify patients with reduced left ventricular ejection fraction (<40%). This simple test predicts a poor prognosis, aiding in early risk stratification for acute myocardial infarction patients.
Area of Science:
- Cardiology
- Biomarker Research
- Diagnostic Imaging
Background:
- Acute myocardial infarction (AMI) poses significant mortality risks.
- Left ventricular ejection fraction (LVEF) is a key prognostic indicator post-AMI.
- Accurate identification of patients with LVEF < 40% is crucial for timely intervention.
Purpose of the Study:
- To evaluate serum troponin T (cTnT) as a non-invasive marker for identifying AMI patients with LVEF < 40%.
- To correlate cTnT levels with angiographically determined LVEF in a post-MI cohort.
- To assess the prognostic value of cTnT in predicting adverse outcomes in AMI.
Main Methods:
- Prospective study of 50 consecutive patients admitted for their first AMI.
- Measurement of serum troponin T concentrations within 12-48 hours of admission.
- Performance of coronary angiography and left ventriculography to determine LVEF.
Main Results:
- A strong negative correlation was observed between serum troponin T levels and LVEF (r = -0.72, p < 0.0001).
- A troponin T concentration > 2.8 µg/L accurately predicted LVEF < 40% with 100% sensitivity and 92.9% specificity.
- Receiver operator characteristic (ROC) curve analysis showed high diagnostic accuracy (Area Under Curve = 0.9773).
Conclusions:
- Serum troponin T is a reliable, non-invasive, and cost-effective biomarker for identifying AMI patients with impaired LVEF (<40%).
- Elevated troponin T levels identify patients at high risk for adverse prognosis following their first myocardial infarction.
- This biomarker facilitates early risk stratification and guides clinical management decisions.
Aim:
To determine whether measurement of serum troponin T concentration after first acute myocardial infarction can be used to identify patients with a left ventricular ejection fraction of < 40%, who have an adverse prognosis.
Methods:
Troponin T concentration was measured, and coronary and left ventriculography performed in 50 consecutive patients with acute myocardial infarction. Angiographic left ventricular ejection fraction was compared with serum troponin T concentration. Patients with previous myocardial infarction were excluded.
Results:
There was a strong negative correlation between left ventricular ejection fraction and troponin T concentration. Spearman's rank correlation coefficient (corrected for ties) was -0.72 (95% confidence intervals (CI) -0.55 to -0.83; p < 0.0001). Analysis by receiver operator characteristic curve produced an area under the curve of 0.9773 (95% CI 0.9409 to 1.0136). A troponin T concentration of > 2.8 micrograms/l predicted a left ventricular ejection fraction of < 40% with a sensitivity of 100% (CI 84.6 to 100.0) and specificity of 92.9% (CI 76.5 to 99.1). Exclusion of patients who did not receive thrombolytic treatment did not significantly affect the results.
Conclusion:
Serum troponin T concentration measured 12-48 hours after admission for first myocardial infarction is a reliable, simple, quick, inexpensive, non-invasive method for identifying patients with a left ventricular ejection fraction of < 40% for whom there is a poor prognosis.