Cardiac enzymes include lactate dehydrogenase, glutamate aminotransferase, and phosphocreatine kinase, as well as phosphocreatine kinase isoforms and glutamate aminotransferase, but it is phosphocreatine kinase isoforms, also known clinically as CKMB, which has the highest specificity and is found in the heart. This index is significantly elevated in myocardial necrosis, the reference value is 0-25U/L, and it will be more than three times higher in patients with myocarditis, that is, more than 75U/L, and other cardiac enzymes will be elevated as well. However, there is a better indicator for myocarditis and myocardial necrosis, called troponin, which has a higher specificity and is therefore used more often in clinical practice.