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Cardiac enzymes are irrelevant in the patient with suspected myocardial contusion
W L Biffl1, F A Moore, E E Moore
1Department of Surgery, Denver General Hospital, Colorado 80204-4507.
Insights
Elevated cardiac enzyme levels do not reliably predict complications in blunt chest trauma patients with suspected myocardial contusion. Routine cardiac enzyme testing should be removed from practice guidelines due to its lack of clinical utility and high cost.
Area of Science:
- Cardiology
- Trauma Surgery
- Emergency Medicine
Background:
- Myocardial contusion, a serious condition after blunt chest trauma, presents diagnostic challenges due to low complication rates and unreliable predictive tests.
- The role of elevated cardiac enzyme levels in diagnosing myocardial contusion and predicting complications remains controversial.
- Current management strategies for suspected myocardial contusion are often confounded by the lack of cost-effective diagnostic tools.
Purpose of the Study:
- To evaluate the clinical utility of cardiac enzyme levels in predicting complications in patients with suspected myocardial contusion.
- To assess the cost-effectiveness of routine cardiac enzyme assays in the management of blunt chest trauma.
- To determine if cardiac enzyme elevation is a sole predictor of complications in myocardial contusion.
Main Methods:
- A retrospective analysis of 359 high-risk blunt chest trauma patients over 4 years.
- Application of an established practice guideline for patient assessment.
- Multivariate statistical modeling to evaluate early risk factors, with a focus on cardiac enzyme levels.
Main Results:
- Myocardial contusion was diagnosed in 30% of patients; complications (dysrhythmias, cardiogenic shock) occurred in 5%.
- Cardiac enzyme elevation was not the sole predictor of complications in any patient.
- Routine cardiac enzyme assays incurred substantial costs without demonstrating significant clinical benefit.
Conclusions:
- Cardiac enzyme determinations lack a useful role in evaluating patients with suspected myocardial contusion.
- Current practice guidelines should eliminate routine cardiac enzyme testing for myocardial contusion.
- Focusing on established risk factors and guidelines may improve cost-effectiveness in managing blunt chest trauma.
Background:
Myocardial contusion is commonly diagnosed following blunt chest trauma, and has potentially lethal complications. Cost-effective case management in patients with suspected myocardial contusion is confounded by the low incidence of complications and the lack of a reliable test to predict them. The clinical usefulness of elevated cardiac enzyme levels is controversial.
Methods:
We analyzed a 4-year experience of 359 patients with high-risk blunt chest trauma who were assessed using an established practice guideline. Our multivariate statistical model evaluated all of the early risk factors included in the guideline, specifically focusing on cardiac enzyme levels.
Results:
Myocardial contusion was diagnosed in 30% of patients, and complications (dysrhythmias and cardiogenic shock) occurred in 5%. In no case was cardiac enzyme elevation the sole predictor of a complication. The cost of routine cardiac enzyme assay was substantial.
Conclusion:
Cardiac enzyme determinations have no useful role in the evaluation of patients with suspected myocardial contusion. They should be eliminated from current practice guidelines.