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Long-term value of exercise testing after acute myocardial infarction: influence of thrombolytic therapy
1Department of Cardiology, Rambam Medical Center and Statistics Laboratory, Technion-Israel Institute of Technology, Faculty of Medicine, Haifa, Israel.
Insights
Early exercise testing after acute myocardial infarction (AMI) predicts long-term survival, but its value varies based on thrombolytic therapy, ST-segment depression, and revascularization rates. These exercise parameters offer crucial prognostic information for AMI patients.
Area of Science:
- Cardiology
- Clinical Exercise Physiology
Background:
- Early risk stratification after acute myocardial infarction (AMI) is crucial for patient management.
- Exercise testing provides valuable prognostic information in post-MI patients.
Purpose of the Study:
- To assess the long-term predictive accuracy of early exercise testing in patients who received thrombolytic therapy for AMI.
- To determine how factors like thrombolysis, ST-segment depression, and revascularization influence exercise test prognostic value.
Main Methods:
- A nonblinded prospective follow-up study was conducted.
- 443 patients underwent exercise testing 3 weeks post-AMI.
- Patients were followed for a median of 75 months, with subgroups receiving or not receiving IV thrombolysis.
Main Results:
- Reduced physical working capacity, left ventricular dysfunction, and 1-mm to <2-mm ST depression on exertion increased cardiac death risk.
- In thrombolysis patients, no deaths occurred with ≥2-mm ST depression, associated with high revascularization.
- No exercise parameters predicted recurrent infarction in the thrombolysis group; cardiac death was linked to ≥2-mm ST depression and reduced capacity in non-thrombolysis patients.
Conclusions:
- Exercise test parameters have variable predictive value for long-term survival post-AMI.
- The prognostic utility is influenced by thrombolytic therapy administration, degree of ST-segment depression, and revascularization rates.
Objectives:
To evaluate the long-term predictive value of exercise testing performed early after acute myocardial infarction (AMI) in patients receiving thrombolytic therapy.
Design:
Nonblinded prospective follow-up study.
Setting:
Cardiac rehabilitation unit in a 900-bed university hospital.
Subjects:
Four hundred forty-three patients allowed to perform exercise testing 3 weeks after AMI were followed for a median of 75 months; 183 received IV thrombolysis and 263 did not.
Results:
Cardiac death hazard ratios were significantly increased in the presence of reduced physical working capacity on exertion, left ventricular dysfunction, and > or = 1-mm (but < 2-mm) ST-segment depression on exertion. In the group receiving thrombolytic therapy, no patient with > or = 2-mm ST-segment depression on exercise died; this group was characterized by a high rate of revascularization, whereas the group with > or = 1-mm but < 2-mm ST-segment depression was not. No parameter related to clinical or exercise testing predicted recurrent infarction in the group receiving thrombolytic therapy. Among patients not receiving thrombolysis, cardiac death was significantly related to > or = 2-mm ST-segment depression on exertion, to reduced physical working capacity, and to the lack of revascularization during follow-up.
Conclusion:
Exercise test-derived parameters have variable value in predicting long-term survival of patients performing exercise test after AMI depending on the following: (1) whether thrombolytic therapy was given or not; (2) the degree of ST-segment depression during exercise testing; and (3) the rate of revascularization.