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Myocardial infarction with an initially normal electrocardiogram--angiographic findings
L Caceres1, D Cooke, R Zalenski
1Department of Medicine, Lutheran General Hospital, Park Ridge, IL 60068-1174, USA.
Clinical Cardiology
|October 1, 1995
Summary
Acute myocardial infarction (AMI) with a normal initial electrocardiogram (ECG) is uncommon. Persistent normal ECGs in AMI patients often indicate branch vessel lesions, leading to less damage and fewer complications.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Acute myocardial infarction (AMI) diagnosis typically relies on electrocardiogram (ECG) changes.
- A subset of AMI patients present with a normal initial ECG, posing a diagnostic challenge.
Purpose of the Study:
- To investigate the characteristics and outcomes of AMI patients with an initially normal ECG.
- To differentiate patient groups based on subsequent ECG evolution and correlate findings with coronary lesion location.
Main Methods:
- Retrospective review of 732 AMI patients over two years.
- Identification of 21 patients with normal initial ECGs who underwent coronary arteriography.
- Classification into three groups based on ECG evolution: ST elevation/Q waves, ST depression/T-wave inversion, or persistently normal ECG.
Main Results:
- The incidence of AMI with a normal initial ECG was 3.7%.
- Patients with persistently normal ECGs (Group 3) had lesions in branch vessels, unlike those with ST elevation/Q waves (Group 1) who had major coronary trunk involvement.
- ECG changes typically occurred within 48 hours of hospitalization.
Conclusions:
- AMI with a normal initial ECG is uncommon but can involve any coronary artery.
- Persistent normal ECGs in AMI are associated with branch vessel lesions, smaller infarct size, and fewer complications.
- ECG evolution within 48 hours is common in AMI patients with initial ECG abnormalities.