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[Myocardial infarction with normal electrocardiogram]
C Bouchiat1, P Talard, B Y Mafart
1Service de Cardiologie, Hôpital d'Instruction des Armées Sainte-Anne, Toulon.
Insights
Electrocardiograms (ECG) can miss lateral wall myocardial infarcts, even when normal. Diagnosis relies on elevated cardiac enzymes (CPK), but these infarcts often have a good short-term prognosis.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Myocardial infarction (MI) diagnosis typically involves electrocardiogram (ECG) and cardiac enzyme levels.
- ECG's sensitivity for detecting lateral wall MIs can be limited.
Observation:
- Two cases of lateral wall MI diagnosed solely by elevated creatine phosphokinase (CPK) levels.
- ECG remained normal throughout hospitalisation in both cases.
Findings:
- Lateral wall myocardial infarcts due to first marginal artery occlusion may not be detected by standard ECG.
- Elevated CPK was the key diagnostic marker in these specific infarct cases.
Implications:
- Normal or minimally abnormal ECG in suspected MI necessitates further investigation with cardiac biomarkers.
- Delayed diagnosis of lateral wall MI due to ECG limitations may impact treatment strategies.
- Patients with normal admission ECGs and MI have a favorable short-term prognosis, suggesting less aggressive initial management may be appropriate.
Abstract:
These two cases concern myocardial infarcts where the electrocardiogram (ECG) was within normal limits at admission and throughout the period of hospitalisation, the diagnosis of an infarct being made secondarily on the basis of raised CPK. Both cases involved infarcts limited to the lateral wall due to occlusion of the first marginal artery of the left border. Several recent studies have evaluated the diagnostic value of the ECG in infarcts and have shown its lack of sensitivity in lateral infarcts. The resultant diagnostic difficulties may lead to delayed treatment, the consequences of which should not be capital since it has been shown that infarcts with a normal or minimally abnormal ECG at the time of admission have a favourable short term prognosis.