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Myoglobin

An early biomarker to aid in the diagnosis of myocardial infarction

Following myocadial necrosis associated with myocardial infarction (MI), myoglobin is one of the first markers to rise above normal levels, increasing measurably above baseline within 2-4 hours post-infarct, peaking at 9-12 hours, and returning to baseline within 24-36 hours.1,2 In the absence of skeletal muscle trauma or other factors associated with a non-cardiac related increase in circulating myoglobin, myoglobin levels have been used as an early marker for MI.3,4 A number of reports suggest the measurement of myoglobin as a diagnostic aid in “ruling-out” myocardial infarction with negative predictive values of up to 100% reported at certain time periods after onset of symptoms.

1 Mair J, et al. Rapid diagnosis of myocardial infarction by immunoturbidimetric myoglobin measurement (letter). Lancet, 1991;337:1343.
2 Chapelle, JP. Myoglobin. Clin Chem. News, 1991;17:22.
3 Silva DP, et al. Development and application of antibodies to human cardiac myoglobin in rapid fluorescence Immunoassay. Clin. Chem., 1991;37:1356.
4 Hamfelt A, et al. Use of biochemical tests for myocardial infarction in the county of Vasternorrland, a clinical chemistry Routine for the diagnosis of myocardial infarction. Scand. J. Clin. Lab. Invest. Suppl.,1990;200:20.

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