Free Cardiac Enzymes Essay Sample

Cardiac enzymes are vital in circulation. They also aid in assessing patients with suspected myocardial infarction (MI). Nonetheless, these enzymes are different. Thus, despite having the same function, the three major cardiac enzymes, myoglobin, troponin and creatine kinase CK-MB, differ in their duration and MI detection.

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Myoglobin is a cardiac enzyme released into circulation mainly when muscle tissue is damaged, including myocardial necrosis. As a heme protein, it lies in the skeletal muscle and lasts 4-12 hours; hence it is nonspecific for MIs. However, the benefit in the enzyme is that a noticeable increase is observed one hour after an injury. Thus, the enzyme occurs first.

Alternatively, troponin enzymes, namely troponin C, troponin T and troponin I, are normal proteins which are vital in the cardiac myocyte specifically in the contractile apparatus. The proteins are discharged into circulation between 3-6 hours after symptoms and usually remain noticeable for the next 4-9 days. The long half-life enables the efficient diagnosis of MI. However, it is challenging to notice re-infraction because arises in acute stent thrombosis after a percutaneous coronary intervention (PCI). Accordingly, there are several instances for troponin elevation not necessarily related to MI; nonetheless, the enzyme’s elevation is more sensitive than creatine kinase CK-MB and myoglobin.

Creatine kinase is a muscle enzyme existing as isoenzymes. The MB kind is precise to myocardial cells. Like troponin, CK level rises about 3-4 hours after MI but remains only 3-4 days. Its duration is, therefore, shorter than troponin enzymes. Thus, unlike other cardiac enzymes, the aspect makes it vital in the detection of re-infarction during the window of 4-10 days after the first insult. Cardiac enzymes differ in their MI detection and occurrence.

Creatine kinas CK-MB is the most effective for re-infarction detection. Though occurring much later, it lasts longer. Myoglobin occurs first; however, it is least useful in MI detection as it lasts for a day. Alternative, while troponin occurs the same time as CK-MB, it is hard in noticing re-infraction due to PCI. Thus, cardiac enzymes are essential in protecting one during injuries to the heart muscles.


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