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Myoglobin as an early indicator of acute myocardial infarction
Insights
Early detection of acute myocardial infarction is crucial. Serum myoglobin levels offer a faster diagnostic marker than creatine phosphokinase-MB (CPK-MB) in emergency settings.
Area of Science:
- Cardiology
- Biochemistry
Background:
- Electrocardiogram (ECG) and serum enzymes like creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) can yield false-normal results early in acute myocardial infarction (AMI).
- Myoglobin, an oxygen-carrying protein in cardiac and skeletal muscle, is a potential early biomarker for AMI.
Purpose of the Study:
- To evaluate the utility of serum myoglobin as an early diagnostic marker for acute myocardial infarction compared to CPK-MB.
Main Methods:
- A study involving 59 patients presenting with chest pain was conducted.
- Serum myoglobin and CPK-MB levels were measured at presentation (0 hours) and at 3 hours.
Main Results:
- At presentation, myoglobin was elevated in 13 of 21 AMI patients, while CPK-MB was positive in only three.
- By 3 hours, serum myoglobin elevation identified all 21 AMI patients, with CPK-MB positive in 19.
Conclusions:
- Serum myoglobin elevation allows for earlier identification of acute myocardial infarction than CPK-MB.
- Myoglobin testing can facilitate timely admission for intensive monitoring and verification with CPK-MB.
Abstract:
The ECG and the determination of serum enzymes creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) may be falsely normal early in acute myocardial infarction. Myoglobin, an oxygen-carrying protein found in cardiac muscle and striated skeletal muscle, presents an attractive alternative to CPK and LDH in the emergency department setting for identification of acute myocardial infarction. Myoglobin levels may be elevated in the serum within one hour after myocardial cell death with peak levels reached within four to six hours. We report a study of 59 patients presenting to a community hospital with chest pain and subsequent hospitalization. Twenty-one had an acute myocardial infarction. Presenting (0 hour) myoglobin determination was positive in 13 of 21 individuals, while CPK-MB was positive in only three. Serum myoglobin elevation at three hours identified all 21 patients with myocardial infarction with the CPK-MB determination positive in 19. Serum myoglobin elevation may permit early identification of myocardial infarction, with subsequent verification using CPK-MB determination, allowing appropriate intensive care admission for careful monitoring of these patients.