A high a hydroxybutyrate dehydrogenase 241 is abnormal, with normal values ranging from 90-182 U/L. It may be caused by myocarditis, pleural effusion and myocardial infarction. 1. Myocarditis: when there is limited or diffuse inflammatory infection in the myocardium, it may lead to myocarditis, with high α-hydroxybutyrate dehydrogenase and symptoms such as palpitation and shortness of breath. 2. Pleural effusion: If the chest area is infected, it may easily lead to pleurisy, resulting in pleural effusion and high alpha-hydroxybutyrate dehydrogenase. 3. Myocardial infarction: when the myocardium is ischemic for a long time, it will cause myocardial cell failure, resulting in myocardial infarction and high alpha-hydroxybutyrate dehydrogenase. For patients with high alpha-hydroxybutyrate dehydrogenase, they should go to the hospital in time, clarify the cause of the disease and follow the doctor’s instructions for treatment.