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Body surface isopotential maps in old inferior myocardial infarction undetectable by 12 lead electrocardiogram
Insights
Body surface maps effectively diagnose old inferior myocardial infarction missed by standard 12-lead ECG. Positional changes in QRS minimums on body surface maps distinguish infarction from non-infarction groups.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Diagnosing old inferior myocardial infarction can be challenging with conventional 12-lead ECG.
- Subtle Q waves in lead aVF may indicate infarction but lack definitive diagnostic clarity.
Purpose of the Study:
- To evaluate the diagnostic utility of body surface isopotential mapping for inferior myocardial infarction.
- To determine if body surface maps can identify cases not clearly diagnosed by 12-lead ECG.
Main Methods:
- Selected 43 patients with specific Q wave criteria in lead aVF.
- Categorized patients into infarction and non-infarction groups using clinical history and cardiac catheterization.
- Analyzed body surface isopotential maps, focusing on the minimum's positional changes during the early QRS phase.
Main Results:
- Distinctive body surface map patterns were observed between the infarction and non-infarction groups.
- The infarction group showed specific minimum shifts (left posterior chest to lower back/right anterior lower chest).
- The non-infarction group displayed different minimum shifts (back to right upper chest/left anterior chest to lower back).
Conclusions:
- Body surface mapping provides valuable diagnostic information for inferior myocardial infarction.
- The positional dynamics of the QRS minimum on body surface maps differentiate patients with and without infarction.
- Body surface maps offer diagnostic capabilities beyond standard 12-lead ECG for specific infarction cases.
Abstract:
The purpose of this study is to examine the value of body surface isopotential maps in the diagnosis of old inferior myocardial infarction that can not be diagnosed by 12 lead ECG. Forty-three patients with a Q wave of at least 0.02 sec but less than 0.04 sec in width and also less than 25% of the R wave in depth in lead a VF of the 12 lead ECG were selected for this study. The patients were divided into infarction and noninfarction groups based on their clinical histories and cardiac catheterization data. The infarction group showed characteristic surface maps with a minimum which moved from the left posterior chest to the lower back or from the lower back to the right anterior lower chest in the early phase of QRS. The noninfarction group exhibited a minimum which shifted from the back to the right upper chest or from the left anterior chest to the lower back in the same phase. Thus, both groups were clearly distinguishable from each other by the positional change of the minimum in the early phase of QRS. This study suggested that body surface maps contain diagnostic information concerning the presence or absence of inferior myocardial infarction which is not easily available from the 12 lead ECG.