Diagnostic accuracy of a prehospital electrocardiogram rule-based algorithm for ST-elevation myocardial infarction:
J H Y Lai1, C T Lui1, T W T Chan2
1Department of Accident and Emergency, Tuen Mun Hospital, Hong Kong SAR, China.
Insights
The prehospital electrocardiogram (PHECG) rule-based algorithm shows high accuracy in diagnosing ST-elevation myocardial infarction (STEMI) in Hong Kong. It demonstrates excellent sensitivity and negative predictive value for STEMI detection.
Area of Science:
- Cardiology
- Emergency Medicine
- Diagnostic Accuracy
Background:
- Prehospital electrocardiogram (PHECG) rule-based algorithms are crucial for timely ST-elevation myocardial infarction (STEMI) diagnosis.
- The Hannover Electrocardiogram System is widely utilized in Hong Kong for PHECG interpretation.
- Evaluating the diagnostic performance of this algorithm in a real-world setting is essential.
Purpose of the Study:
- To assess the diagnostic accuracy of the rule-based PHECG algorithm for STEMI.
- To evaluate the sensitivity, specificity, and predictive values of the algorithm.
- To compare the algorithm's performance against adjudicated blinded ratings and clinical diagnoses.
Main Methods:
- A prospective observational study involving 2210 patients with chest pain who received EMS.
- Analysis of PHECGs using the Hannover Electrocardiogram System rule-based algorithm.
- Diagnostic accuracy evaluated against investigator-adjudicated ratings, attending physician diagnosis, and hospital discharge diagnosis.
Main Results:
- STEMI prevalence was 5.1% in the study population.
- The PHECG algorithm achieved 94.6% sensitivity and 87.9% specificity for STEMI detection.
- Negative predictive value was exceptionally high at 99.7%, indicating strong rule-out capability.
Conclusions:
- The widely used rule-based PHECG algorithm in Hong Kong demonstrates high sensitivity for STEMI diagnosis.
- The algorithm shows fair specificity, suggesting a need for careful clinical correlation.
- PHECGs are valuable tools for rapid STEMI identification in the prehospital setting.
Introduction:
This study reviewed the diagnostic accuracy of the prehospital electrocardiogram (PHECG) rule-based algorithm for ST-elevation myocardial infarction (STEMI) universally utilised in Hong Kong.
Methods:
This prospective observational study was linked to a population-wide project. We analysed 2210 PHECGs performed on patients who presented to the emergency medical service (EMS) with chest pain from 1 October to 31 December 2021. The diagnostic accuracy of the adopted rulebased algorithm, the Hannover Electrocardiogram System, was evaluated using the adjudicated blinded rating by two investigators as the primary reference standard. Diagnostic accuracy was also evaluated using the attending emergency physician's diagnosis and the diagnosis on hospital discharge as secondary reference standards.
Results:
The prevalence of STEMI was 5.1% (95% confidence interval [CI]=4.2%-6.1%). Using the adjudicated blinded rating by investigators as the reference standard, the rule-based PHECG algorithm had a sensitivity of 94.6% (95% CI=88.2%-97.8%), specificity of 87.9% (95% CI=86.4%-89.2%), positive predictive value of 29.4% (95% CI=24.8%-34.4%), and negative predictive value of 99.7% (95% CI=99.3%-99.9%) [all P<0.05].
Conclusion:
The rule-based PHECG algorithm that is widely used in Hong Kong demonstrated high sensitivity and fair specificity for the diagnosis of STEMI.
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