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Electrocardiographic diagnosis of reperfusion during thrombolytic therapy in acute myocardial infarction
P A Doevendans1, A P Gorgels, R van der Zee
1Department of Cardiology, Academic Hospital Maastricht, The Netherlands.
Insights
Early electrocardiographic signs predict successful reperfusion in acute myocardial infarction patients undergoing thrombolytic therapy. ST-segment normalization and specific arrhythmias indicate a patent vessel, aiding treatment assessment.
Area of Science:
- Cardiology
- Medical Imaging
- Clinical Medicine
Background:
- Acute myocardial infarction (AMI) requires prompt reperfusion therapy.
- Thrombolytic therapy is a common treatment for AMI.
- Assessing reperfusion success is critical for patient outcomes.
Purpose of the Study:
- To identify early electrocardiographic (ECG) indicators of successful reperfusion in patients with AMI treated with thrombolytics.
- To correlate specific ECG findings with coronary angiography results indicating a patent vessel.
Main Methods:
- Continuous 12-lead ECG monitoring was conducted in 61 AMI patients receiving thrombolytic therapy.
- Coronary angiography was performed within 90 minutes to assess vessel patency (Thrombolysis in Myocardial Infarction [TIMI] trial 2 or 3).
- ECG changes were analyzed for correlation with reperfusion status.
Main Results:
- A patent vessel (TIMI 2 or 3) was found in 44 out of 61 patients.
- Early reperfusion signs included ST-segment normalization (LR 16.0), terminal T-wave inversion (LR 10.6), accelerated idioventricular rhythm (LR 6.0), and increased ventricular premature complexes (LR 2.5).
- 96% of patients reported chest pain relief after 60 minutes; however, 61% showed increased ST-segment deviation and 69% experienced increased chest pain during reperfusion.
Conclusions:
- Specific ECG changes are reliable early indicators of successful reperfusion in AMI patients treated with thrombolytics.
- ECG monitoring can complement angiography in assessing treatment efficacy.
- Understanding these ECG patterns aids in timely clinical decision-making for AMI management.
Abstract:
Continuous 12-lead electrocardiographic monitoring was performed in 61 patients receiving thrombolytic therapy for an acute myocardial infarction. Coronary angiography within 90 minutes revealed a patent vessel (Thrombolysis in Myocardial Infarction [TIMI] trial 2 or 3) in 44 patients. Early signs of reperfusion were ST-segment normalization (likelihood ratio 16.0), development of terminal T-wave inversion (likelihood ratio 10.6), accelerated idioventricular rhythm (likelihood ratio 6.0), and a twofold increase in ventricular premature complexes (likelihood ratio 2.5). Relief of chest pain after 60 minutes was reported by 96%. During reperfusion of the infarct-related vessel, an increase in ST-segment deviation was recorded in 61% of the patients, whereas 69% had an increase in chest pain preceding the eventual decline.