Cardiac Vascular Nursing Certification 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which biomarker is known to elevate and return to normal the earliest after myocardial injury?

CK

Troponin

Myoglobin

Myoglobin is a small protein found in muscle tissue, including cardiac muscle. Following a myocardial injury, myoglobin is released into the bloodstream quickly due to its low molecular weight. This rapid release allows myoglobin levels to rise early after damage occurs, sometimes within 1 to 2 hours post-injury.

Additionally, myoglobin has a relatively short half-life, meaning its levels can return to baseline more swiftly compared to other biomarkers used to assess myocardial injury. This characteristic makes myoglobin a useful initial marker for detecting myocardial damage, especially in the early stages.

In contrast, biomarkers like troponin and CK have different kinetics; troponin levels typically rise later and remain elevated for a longer time following an injury. LDH similarly tends to peak later and stays elevated even longer compared to myoglobin. Understanding these dynamics is crucial for clinicians in evaluating the timing and extent of myocardial injury.

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LDH

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