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Early prediction of risk in patients with suspected unstable angina using serum troponin T
Insights
Detectable serum troponin T in patients with unstable angina predicts serious cardiac events within six months. Early troponin T testing can identify high-risk individuals needing prompt intervention.
Area of Science:
- Cardiology
- Biomarkers
- Clinical Risk Stratification
Background:
- Rest angina affects many patients with detectable cardiac troponin T.
- This subgroup may face a higher risk of severe cardiac events.
Purpose of the Study:
- To determine if early serum troponin T levels predict cardiovascular complications in suspected unstable angina.
- Investigate troponin T as an independent risk factor.
Main Methods:
- Prospective cohort study of 164 patients with suspected rest angina.
- Serum troponin T measured 14 hours post-symptom onset.
- Logistic regression analysis to identify independent risk factors over six months.
Main Results:
- Elevated troponin T (0.05 microgram/L) found in 33% of patients.
- Admission ECG predicted in-hospital events, but troponin T did not.
- Detectable troponin T independently predicted serious complications during six-month follow-up (OR 3.7).
Conclusions:
- Serum troponin T > 0.05 microgram/L is a significant predictor of six-month cardiac events in rest angina patients.
- Early troponin T measurement aids in identifying high-risk patients for timely intervention and revascularization.
Background:
One-third of patients with rest angina are reported to have detectable cardiac troponin T in the serum and may be at increased risk of serious cardiac events.
Aim:
To investigate whether a single early estimation of serum troponin T was an independent predictor of serious cardiovascular complications in patients with suspected unstable angina.
Methods:
A prospective cohort study in which patients with suspected rest angina had a serum troponin T estimation 14 hours after symptom onset and were classified using discriminator levels of serum troponin T of 0.05 and 0.1 microgram/L as well as a number of other variables. All patients were followed for six months to document any cardiac complications and a stepwise logistic regression analysis was conducted to determine independent risk factors of complications.
Results:
One hundred and sixty-four patients were evaluated. Using a discriminator level of 0.05 microgram/L 54 patients (33%) had detectable troponin T. The admission ECG was the only independent predictor of cardiac events in hospital--odds ratio 4.0 (95% CI 1.7-9.6). Detectable troponin T did not appear to be an independent predictor of serious complications. During the six-month follow-up period, detectable troponin T using a discriminator of 0.05 microgram/L was an independent predictor of serious complications--odds ratio 3.7 (95% CI 1.8-7.6).
Conclusions:
In patients with suspected rest angina, detectable serum troponin T > 0.05 microgram/L is an independent predictor of serious cardiac events during the six-month follow-up period although not during hospitalisation. Using a single, early serum troponin T estimation and other variables available at the time of admission, a high risk subgroup who may benefit from early investigation and revascularisation can be identified.