There are five types of lactate dehydrogenase isoenzymes. Lactate dehydrogenase isoenzymes are found in cardiac muscle cells and are present in very small amounts in the blood. Lactate dehydrogenase isoenzymes are released into the bloodstream and are detected when the heart muscle cells are damaged. High lactate dehydrogenase isoenzyme should be considered in conjunction with symptoms of heart disease. If you have chest pain with shoulder and back pain, radiating pain, and an electrocardiogram suggesting myocardial ischemia, high lactate dehydrogenase isoenzyme should be considered as myocardial ischemic necrosis, as well as high lactate dehydrogenase isoenzyme in patients with myocarditis, and high liver and gallbladder disease. If you suffer from digestive symptoms, you should focus on hepatobiliary disease. Clinically, malignant tumors are also increased, and the higher the LDH, the worse the prognosis. A high lactate dehydrogenase isoenzyme should be considered in conjunction with other diseases, and a slight elevation is usually meaningless.