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Electrocardiographic diagnosis of myocardial infarction in patients with pacemakers
Insights
Diagnosing myocardial infarction during artificial pacing is possible. New ECG changes during right ventricular pacing can indicate heart attack, aiding clinical decisions.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Diagnostics
Background:
- Right ventricular pacing is a common intervention for cardiac rhythm management.
- Myocardial infarction (MI) can present atypical electrocardiogram (ECG) findings in patients with pacemakers.
- Understanding pacemaker-induced ECG changes is crucial for accurate MI diagnosis.
Purpose of the Study:
- To investigate electrocardiogram (ECG) changes during myocardial infarction (MI) in patients with transvenous pacemakers.
- To determine the diagnostic utility of ECG patterns during right ventricular pacing in the context of MI.
Main Methods:
- The study included 32 patients with transvenous pacemakers who experienced myocardial infarction.
- Electrocardiograms (ECGs) were analyzed during right ventricular pacing.
- ECG findings were correlated with the occurrence of myocardial infarction.
Main Results:
- Right ventricular pacing resulted in ECG patterns resembling left bundle branch block (29 patients) or right bundle branch block (2 patients).
- Myocardial infarction induced new ECG changes in 20 out of 32 patients during pacemaker rhythm.
- Observed changes included QS complexes, ST segment abnormalities, T wave inversions, and combined abnormalities.
Conclusions:
- Electrocardiogram (ECG) changes associated with myocardial infarction during artificial pacing are identifiable.
- Recognizing these specific ECG alterations in patients with pacemakers can significantly aid in the diagnosis of heart attacks.
Abstract:
The ECG changes of myocardial infarction during permanent or transient right ventricular pacing were studied in 32 patients with transvenous pacemakers who developed myocardial infarction. During right ventricular pacing the electrocardiogram resembled left bundle branch block in 29 patients, right bundle branch block in two, and in one patient the pattern could not be determined. Myocardial infarction induced new ECG changes during pacemaker rhythm in 20 of the 32 patients. There were only QS complexes in 5 cases, ST segment abnormalities in 4 and T wave inversions in 4, negative Q and T waves were simultaneously observed in one patient, Q wave and S-T segment changes in 3 and S-T segment change and T wave inversion in 3 patients. It is concluded that knowledge of the ECG changes induced by myocardial infarction in most patients under artificial pacing can be useful for diagnosis.