Which lab values should be closely monitored in patients with myocardial infarction (MI, heart attack)?

Updated: May 07, 2019
  • Author: A Maziar Zafari, MD, PhD, FACC, FAHA; Chief Editor: Eric H Yang, MD  more...
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In the setting of MI, closely monitor potassium and magnesium levels. The creatinine level is also needed, prior to cardiac catheterization and prior to initiating treatment with an angiotensin-converting enzyme (ACE) inhibitor. Blood glucose levels are important to measure, as many patients are first diagnosed with diabetes when they present with MI.

Although not routinely measured, the erythrocyte sedimentation rate (ESR) rises above reference range values within 3 days and may remain elevated for weeks.

The serum lactate dehydrogenase (LDH) level rises above the reference range within 24 hours of MI, reaches a peak within 3-6 days, and returns to the baseline within 8-12 days.

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