Related Experiment Videos
Risk stratification by treadmill testing in acute myocardial infarction following thrombolytic therapy
A Banerjee1, N B Debnath, S Roy
1Railway Hospital, Howrah.
Insights
Treadmill tests (TMT) may not effectively stratify risk for acute myocardial infarction (AMI) survivors in the post-thrombolytic era. This study found TMT parameters were insignificant in predicting future cardiac events in these patients.
Area of Science:
- Cardiology
- Clinical Medicine
- Preventive Cardiology
Background:
- Risk stratification is crucial for acute myocardial infarction (AMI) survivors to predict future cardiovascular events.
- Treadmill testing (TMT) has been a traditional method for risk stratification.
- The efficacy of TMT in the post-thrombolytic era requires re-evaluation, as most existing algorithms predate widespread thrombolysis.
Purpose of the Study:
- To evaluate the effectiveness of symptom-limited treadmill testing (TMT) for risk stratification in male patients surviving acute myocardial infarction (AMI).
- To determine if TMT parameters can predict cardiac events in the post-thrombolytic treatment era.
Main Methods:
- Fifty male AMI survivors (age 38-62) underwent symptom-limited TMT using the Modified Bruce Protocol.
- Patients were followed up for 6-10 months to record cardiac events.
- TMT parameters including ST segment depression, number of leads with ST depression, work capacity (METs), and blood pressure response were compared between groups with and without events.
Main Results:
- Out of 38 patients followed up, 22 experienced cardiac events (Group A) and 16 did not (Group B).
- Statistically insignificant differences were observed between Group A and B in key TMT parameters: ST depression > 2.5 mm (12 vs 9), number of leads with ST depression (66 vs 48), mean work capacity (8.1 vs 7.9 METs), and mean systolic blood pressure response.
- Cardiac events included unstable angina, reinfarction, sudden death, and need for coronary artery bypass grafting or angioplasty.
Conclusions:
- This study suggests that treadmill testing (TMT) may not be a reliable prognostic indicator for risk stratification in acute myocardial infarction (AMI) survivors treated with thrombolysis.
- The efficacy of TMT in predicting future cardiac events in the post-thrombolytic era remains undetermined.
- Further research is needed to establish effective risk stratification methods for contemporary AMI survivors.
Abstract:
Survivors of acute myocardial infarction (AMI) should have risk stratification for assessment of their future risk of cardiovascular events. One of the important means of risk stratification is by treadmill test (TMT). Most of the algorithms for assessment were done in the prethrombolytic era. But in the post-thrombolytic era, risk stratification by TMT should be properly evaluated. Fifty males with confirmed AMI with age ranging from 38-62 years (mean 48 years) were tested with a symptom limited (Modified Bruce Protocol) TMT. The patients were followed up for a minimum of 6 months (range 6-10 months). Out of 50 patients, 38 reported for follow up. Among them 22 (Group A) had cardiac events and 16 (Group B) had no events. Among the patients (Group A), 6 had unstable angina, 7 had reinfarction, 2 had sudden death, 4 had coronary artery bypass grafting (CABG) and 3 had angioplasty. Comparison between the two groups, A and B in TMT parameters like ST segment depression > 2.5 mm (12 vs 9), no. of leads where ST depression occurred (66 vs 48) during exercise, mean work capacity (8.1 vs 7.9 mets), mean systolic blood pressure response were all statistically insignificant. Though TMT was believed to be a good prognostic indicator to assess further cardiac events after AMI, its efficacy in risk stratification after thrombolysis is yet to be determined. This study does not show its worth in post MI risk assessment.