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Early Differentiation of Stress Cardiomyopathy from Acute Anterior Wall Myocardial Using Changing Cardiac Enzyme
Ji Yeon Hong1, Sung Kee Ryu2, Ji Young Park1
1Division of Cardiology, Department of Internal Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
Insights
Changes in cardiac enzymes like creatine kinase MB (CK-MB) and troponin T (Tn-T) can help distinguish stress cardiomyopathy (SCMP) from ST elevation myocardial infarction (STEMI). Peak enzyme levels are key indicators for early differentiation.
Area of Science:
- Cardiology
- Biochemistry
- Diagnostic Medicine
Background:
- Acute anterior wall ST elevation myocardial infarction (STEMI) and stress cardiomyopathy (SCMP) share elevated cardiac enzyme patterns.
- Cardiac enzyme kinetics offer potential for early differentiation between STEMI and SCMP.
Purpose of the Study:
- To evaluate the utility of serial cardiac enzyme measurements in differentiating SCMP from anterior STEMI.
- To identify specific enzyme thresholds for distinguishing between these two cardiac conditions.
Main Methods:
- Retrospective analysis of 27 SCMP patients and 30 anterior STEMI patients.
- Comparison of initial and peak levels of creatine kinase MB (CK-MB) and troponin T (Tn-T).
Main Results:
- Anterior STEMI patients exhibited higher initial CK-MB levels compared to SCMP patients.
- Peak CK-MB and Tn-T levels, along with their changes from baseline, were significantly greater in the STEMI group.
- Peak CK-MB > 46.65 ng/mL or Tn-T > 1.56 ng/mL effectively differentiated SCMP from anterior STEMI.
Conclusions:
- Serial changes in cardiac enzymes serve as an effective early diagnostic tool.
- Monitoring peak CK-MB and Tn-T levels aids in distinguishing SCMP from anterior STEMI.
Background:
Most patients with acute anterior wall ST elevation myocardial infarction (STEMI) or stress cardiomyopathy (SCMP) show elevations in cardiac enzymes that peak within 24 hours. The changing pattern of cardiac enzymes can be an early clue to the differentiation of anterior STEMI and SCMP.
Methods:
This study was a retrospective analysis (matching cases and respective control subjects) performed at a single center. We compared 27 patients with SCMP and 30 patients with anterior STEMI. We used laboratory data included cardiac marker, such as the initial creatine kinase MB (CK-MB) fraction and troponin T (Tn-T), at admission and peak CK-MB and Tn-T at follow up.
Results:
The mean age was 69.3 ± 14.1 years, and 38.6% of patients were female. The SCMP patients were older, more often female, and had lower left ventricular ejection fractions than the anterior STEMI patients. The initial CK-MB was higher in the anterior STEMI group than in the SCMP group. In contrast, the initial Tn-T level was not significantly different between the 2 groups. Peak CK-MB and Tn-T levels and change from initial levels were significantly greater in the anterior STEMI group than they were in the SCMP group. SCMP could be differentiated from anterior STEMI based on peak CK-MB > 46.65 ng/mL or Tn-T > 1.56 ng/mL.
Conclusions:
Follow-up changes in cardiac enzymes can be an effective early tool for differentiating SCMP from anterior STEMI.
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