MLT

𝐂𝐚𝐫𝐝𝐢𝐚𝐜 𝐛𝐢𝐨𝐦𝐚𝐫𝐤𝐞𝐫𝐬:
Primary cardiac biomarkers used to diagnose and monitor myocardial infarction (heart attack). In clinical practice, we use these markers because they are released into the bloodstream at different times following heart muscle damage.

🔴𝟏. 𝐓𝐫𝐨𝐩𝐨𝐧𝐢𝐧 (𝐓𝐡𝐞 𝐆𝐨𝐥𝐝 𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝)
Troponin is the most sensitive and specific marker for cardiac injury. Because it is almost exclusively found in the heart, any elevation (when combined with clinical symptoms) is highly suggestive of a heart attack.

𝐂𝐥𝐢𝐧𝐢𝐜𝐚𝐥 𝐔𝐭𝐢𝐥𝐢𝐭𝐲: Primary diagnostic tool for Myocardial Infarction (MI).

𝐊𝐢𝐧𝐞𝐭𝐢𝐜𝐬: It rises within 3–6 hours of injury and can remain elevated for up to 10–14 days.

𝐈𝐧𝐭𝐞𝐫𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬: Elevations can sometimes be seen in chronic kidney disease or severe sepsis, so it must be interpreted alongside an ECG.
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🔴𝟐. 𝐂𝐊-𝐌𝐁 (𝐂𝐫𝐞𝐚𝐭𝐢𝐧𝐞 𝐊𝐢𝐧𝐚𝐬𝐞-𝐌𝐁)
CK-MB is an isoenzyme found mostly in the heart, but also in small amounts in skeletal muscle.

𝐂𝐥𝐢𝐧𝐢𝐜𝐚𝐥 𝐔𝐭𝐢𝐥𝐢𝐭𝐲: Most useful for detecting reinfarction. Because it returns to baseline quickly (within 48–72 hours), a second rise in CK-MB levels can indicate a new, subsequent heart attack that Troponin might mask.

𝐈𝐧𝐭𝐞𝐫𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬: Severe skeletal muscle trauma or intense exercise can cause "false" elevations.

🔴𝟯. 𝗠𝘆𝗼𝗴𝗹𝗼𝗯𝗶𝗻:
Myoglobin is an oxygen-binding protein found in all muscle tissue. It is the first marker to rise after injury.

𝗖𝗹𝗶𝗻𝗶𝗰𝗮𝗹 𝗨𝘁𝗶𝗹𝗶𝘁𝘆: High negative predictive value. Because it rises so early (within 1–2 hours), if a patient has chest pain and the myoglobin is normal, we can often "rule out" an immediate MI.

𝗟𝗶𝗺𝗶𝘁𝗮𝘁𝗶𝗼𝗻: Very low specificity. It rises due to any muscle damage (like a heavy workout or a fall), so a high value does not automatically mean a heart attack.

Types of Antibodies& Functions