Risk stratification in unstable coronary artery disease. Additive value of troponin T determinations and
Insights
Troponin T levels and exercise tests are valuable for assessing risk in unstable coronary artery disease patients. Combining these tests improves risk stratification for cardiac events, aiding clinical decisions.
Area of Science:
- Cardiology
- Clinical Risk Assessment
Background:
- Unstable coronary artery disease (CAD) requires accurate prognostic tools.
- Risk stratification is crucial for guiding treatment decisions in acute cardiac events.
Purpose of the Study:
- To evaluate the prognostic value of troponin T levels and exercise test responses in patients with unstable CAD.
- To determine if combining troponin T and exercise test data improves risk prediction.
Main Methods:
- A randomized study involving 963 patients with unstable CAD, treated with low molecular weight heparin.
- Troponin T levels and pre-discharge exercise tests were analyzed as predictors of cardiac death or myocardial infarction.
- Patients were categorized into risk groups based on troponin T levels, exercise test results, or a combination of both.
Main Results:
- Both maximal troponin T levels and exercise test responses independently predicted prognosis.
- Cardiac death or myocardial infarction rates increased with higher troponin T levels and higher exercise test risk categories.
- Combining troponin T and exercise test data provided superior risk categorization compared to either method alone.
Conclusions:
- Troponin T determination is a valuable tool for risk assessment in unstable CAD.
- Pre-discharge exercise testing is also effective for prognostic evaluation in unstable CAD.
- The combined use of troponin T and exercise testing offers enhanced risk stratification for patients with unstable coronary artery disease.
Abstract:
In 963 patients, participating in a randomized study of low molecular weight heparin in unstable coronary artery disease and followed for 5 months, troponin T was determined. In the 766 patients with a pre-discharge exercise test both troponin T level and exercise test response were independent predictors of prognosis. Cardiac death or myocardial infarction occurred in 5, 9 and 13% of the patients with a maximal troponin T level of < 0.06 (n = 154), 0.06-0.2 (n = 175) and > or = 0.2 microgram.l-1 (n = 437), respectively. Based on exercise tolerance and occurrence of ST depression, patients with a low (n = 361), intermediate (n = 325) and high risk (n = 80) exercise test response were identified. In these, death or myocardial infarction occurred in 5, 13 and 29%, respectively. The combination of troponin T and the exercise test response allowed an even better categorization into low (n = 84), intermediate (n = 406) and high (n = 276) risk groups with 1, 7 and 20% death or myocardial infarction, respectively. Among those 197 patients unable to perform an exercise test the incidence was 3, 16 and 27% in patients with troponin T < 0.06, 0.06-0.2 and > or = 0.2 microgram.l-1, respectively. Thus, troponin T determinations and pre-discharge exercise tests alone and combined are valuable for risk assessment in unstable coronary artery disease.
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