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To document optimal sampling frequency, we reviewed creatine kinase (CK) myocardial specific isoenzyme (CKMB) results in 314 patients with suspected acute myocardial infarction (MI). In 127 patients with elevated CK/CKMB, peak CK observed using all samples (every four-hour [Q4hr] method) was compared with results that would have been obtained had samples been taken on admission and either twice daily (every 12-hour [Q12hr] method) or once daily (every 24-hour [Q24hr] method). Although average peak CK was statistically different (Q4hr greater than Q12hr greater than Q24hr), major underestimation of peak CK (greater than or equal to 500 units/L) was uncommon (3%) using the Q12hr method, suggesting that Q12hr sampling is a practical, cost-effective approach for patients with suspected acute MI.
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L C Becker, and
R W Peters, and
G D Plotnick
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M L Fisher, and
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M L Fisher, and
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