<![CDATA[Heart disease is the number one cause of death in the world. Heart disease is a disease due to blockage of the heart's blood vessels which causes a disturbance in the balance between blood supply and demand. Level II Hospital Ridwan Meureksa is a hospital that provides inpatient, outpatient and emergency services. One of the services at the Level II Hospital Moh. Ridwan Meureksa is dealing with matters related to the human heart. In January 2021 to December 2021 at the Moh. Ridwan Meureksa the number of people with heart disease has increased and it is necessary to anticipate the increase in the future. This study aims to classify based on probability or probability from previous data, as well as obtain information about accuracy, precision and recall obtained when testing patient data using the Naive Bayes algorithm. The data used is medical record data of 3970 patients with heart disease cases. The results of the analysis show that symptoms of shortness of breath, rapid pulse, palpitations, weight loss, fever and decreased consciousness can be indicators for diagnosing heart disease. The results of this study are 99.7% and 98.7%, accuracy, 99.8% and 99.3%, precision and 99.8 % and 99.3%.recall.]]>
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