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Value of negative predischarge exercise testing in identifying patients at low risk after acute myocardial infarction
Insights
A negative predischarge exercise test effectively identifies low-risk patients after acute myocardial infarction (AMI) treated with thrombolysis. This finding remains valuable despite thrombolytic therapy, aiding in risk stratification for cardiac events.
Area of Science:
- Cardiology
- Clinical Medicine
- Exercise Physiology
Background:
- Thrombolytic therapy improves acute myocardial infarction (AMI) survival but increases subsequent cardiac events.
- Optimal diagnostic and therapeutic strategies for post-AMI patients remain elusive.
- Identifying low-risk patients after AMI is crucial for tailored management.
Purpose of the Study:
- To evaluate the utility of predischarge exercise testing in identifying low-risk patients post-AMI treated with thrombolysis.
- To determine if thrombolytic therapy impacts the predictive value of exercise testing.
- To assess the correlation between exercise test results and 6-month cardiac event rates.
Main Methods:
- 157 patients with uncomplicated AMI underwent maximal or symptom-limited exercise testing (Bruce protocol) within 15 days of treatment.
- Patients were stratified into groups based on exercise test results (negative vs. positive for angina/ST depression).
- Follow-up for 6 months monitored major (death, reinfarction) and minor (angina) coronary events.
Main Results:
- No deaths occurred during follow-up.
- Patients with negative exercise tests (n=105) had significantly fewer reinfarctions (3%) and postinfarction angina (7%) compared to those with positive tests (n=52; 4% reinfarctions, 40% angina).
- 90% of patients with negative exercise tests were event-free at 6 months (97% free of major events).
Conclusions:
- Negative predischarge exercise testing is a valuable tool for identifying low-risk patients following acute myocardial infarction treated with thrombolysis.
- Thrombolytic therapy does not diminish the prognostic significance of a negative exercise test.
- This testing aids in stratifying patients for appropriate post-AMI care and risk management.
Abstract:
Although thrombolytic therapy reduces mortality in patients with acute myocardial infarction (AMI), it is associated with a greater incidence of successive coronary events, and there is still no ideal diagnostic and therapeutic strategy for such patients. The present study verifies the value of negative predischarge exercise testing in identifying low-risk patients treated with thrombolysis after AMI. One hundred fifty-seven consecutive patients with an uncomplicated clinical course underwent maximal or symptom-limited exercise testing (Bruce treadmill protocol) within 15 days of AMI in the absence of therapy. The location of the AMI was anterior in 51 patients, inferior in 85 and non-Q-wave in 21. All of the patients were followed for 6 months. Death and nonfatal reinfarction were considered as major coronary events, and the recurrence of angina as a minor event. Exercise test results were negative in 105 patients (group 1) and positive for angina or ST depression greater than or equal to 0.1 mV in 52 (group 2). No deaths occurred during follow-up; there were 3 reinfarctions (3%) and 7 cases (7%) of postinfarction angina in group 1, and 2 reinfarctions (4%) and 21 cases (40%) of postinfarction angina in group 2. By the end of follow-up, 90% of the patients with negative exercise test results were event-free (97% in the case of major events). These results show that thrombolytic therapy does not affect the value of negative postinfarction exercise testing in identifying low-risk patients.