Abstract: Medical field is fast growing with adoption of technology tools. Technology has reduced the burden on medical staff with various software which has made the works quick and easy. Medical software when properly planned and utilized has benefits of minimizing the cost and time of the medical professionals. In this regard Data mining is an effective tool that can prove useful to utilize the information in the database in diagnosing a disease or its appropriate treatment. This aids to provide quality care to the patients. In order to achieve this above objective this paper has been designed to develop Computer Based-Medical Decision Support System for Prediction of Heart Attack using Data Mining technique namely Na´ve Bayes. It is a web based questionnaire application. It helps to diagnose the heart disease through the answer given by the user. Thus it assists the practitioner in even assessing complex conditions & arriving at accurate medical decision/diagnosis.

Keywords: Na´ve Bayes, decision support, data mining, heart disease.