Serial High-Sensitivity Troponin T in Post-Primary Angioplasty Exercise Test
Humberto Andres Vaz1, Ana Paula Vanz1, Iran Castro1
1Fundação Universitária de Cardiologia, Instituto de Cardiologia, Porto Alegre, RS, Brazil.
Insights
High-sensitivity troponin T (hscTnT) levels increase more after abnormal exercise tests (ET) in ST-segment elevation myocardial infarction (STEMI) patients. This suggests ET can reveal cardiac stress, impacting hscTnT release kinetics.
Area of Science:
- Cardiology
- Biomarker Research
- Clinical Exercise Physiology
Background:
- Assessing high-sensitivity troponin T (hscTnT) release kinetics is crucial, particularly following functional tests that may induce transient ischemia.
- Understanding hscTnT behavior post-exercise is vital for diagnosing and managing cardiac conditions.
Purpose of the Study:
- To investigate serial hscTnT release patterns after exercise testing (ET) in ST-segment elevation myocardial infarction (STEMI) survivors.
- To correlate elevated hscTnT levels with exercise test findings suggestive of myocardial ischemia.
Main Methods:
- Ninety-five STEMI patients underwent ET three months post-angioplasty, with hscTnT measured at baseline and 2, 5, and 8 hours post-exercise.
- Key outcomes included peak hscTnT, the ratio of hscTnT at 5 hours to baseline (TnT5h/TnT0h), and the area under the curve (AUC).
- Statistical analysis involved log-transformation, geometric mean ratios, and analysis of covariance, adjusted for baseline values, demographics, and exercise parameters.
Main Results:
- The highest hscTnT geometric means were observed 5 hours post-exercise (TnT5h).
- After adjustments, patients with abnormal ET showed significantly higher peak hscTnT (59%), TnT5h/TnT0h ratio (59%), and AUC (45%) compared to those with normal ET.
- These differences were statistically significant (p < 0.003).
Conclusions:
- Abnormal exercise tests in STEMI patients are associated with greater elevations in hscTnT compared to normal tests.
- Serial hscTnT measurements after ET can help identify individuals with exercise-induced ischemic abnormalities.
Background:
The kinetics of high-sensitivity troponin T (hscTnT) release should be studied in different situations, including functional tests with transient ischemic abnormalities.
Objective:
To evaluate the release of hscTnT by serial measurements after exercise testing (ET), and to correlate hscTnT elevations with abnormalities suggestive of ischemia.
Methods:
Patients with acute ST-segment elevation myocardial infarction (STEMI) undergoing primary angioplasty were referred for ET 3 months after infarction. Blood samples were collected to measure basal hscTnT immediately before (TnT0h), 2 (TnT2h), 5 (TnT5h), and 8 hours (TnT8h) after ET. The outcomes were peak hscTnT, TnT5h/TnT0h ratio, and the area under the blood concentration-time curve (AUC) for hscTnT levels. Log-transformation was performed on hscTnT values, and comparisons were assessed with the geometric mean ratio, along with their 95% confidence intervals. Statistical significance was assessed by analysis of covariance with no adjustment, and then, adjusted for TnT0h, age and sex, followed by additional variables (metabolic equivalents, maximum heart rate achieved, anterior wall STEMI, and creatinine clearance).
Results:
This study included 95 patients. The highest geometric means were observed at 5 hours (TnT5h). After adjustments, peak hscTnT, TnT5h/TnT0h and AUC were 59% (p = 0.002), 59% (p = 0.003) and 45% (p = 0.003) higher, respectively, in patients with an abnormal ET as compared to those with normal tests.
Conclusion:
Higher elevations of hscTnT may occur after an abnormal ET as compared to a normal ET in patients with STEMI.
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