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Strict reliance on a computer algorithm or measurable ST segment criteria may lead to errors in thrombolytic therapy
D Massel1, J A Dawdy, L J Melendez
1Department of Medicine, London Health Sciences Centre, University of Western Ontario, London, Canada. dmassel@lhsc.on.ca
American Heart Journal
|August 5, 2000
Summary
Electrocardiogram interpretation for acute myocardial infarction (AMI) impacts thrombolytic therapy use. Subjective interpretation improves agreement, while strict measurement or computer analysis may lead to inappropriate therapy use.
Area of Science:
- Cardiology
- Medical Diagnostics
Background:
- Thrombolytic therapy is underused in acute myocardial infarction (AMI) patients.
- Electrocardiogram (ECG) interpretation errors may contribute to underuse.
Purpose of the Study:
- To assess if ECG diagnostic errors affect thrombolytic therapy eligibility determination.
- To compare different ECG interpretation criteria for AMI and thrombolysis.
Main Methods:
- Three cardiologists interpreted 75 ECGs twice using measured ST-segment elevation and interpretive criteria.
- ECG interpretations were compared with Marquette 12SL computer system analysis.
Main Results:
- Inter-rater agreement was excellent, especially with interpretive criteria (kappa=0.89).
- Strictly measured criteria led to 15% overuse of thrombolysis.
- Computer analysis showed 100% specificity but 61.5% sensitivity, potentially causing underuse.
Conclusions:
- Combining subjective assessment with measured ST elevation improves AMI diagnosis agreement.
- Over-reliance on measured ECG criteria or computer analysis can lead to inappropriate thrombolytic therapy use (overuse or underuse).