Dr. Smita Mishra, Paediatric Cardiologist, Associate Director - Jaypee Hospital, will discuss about mechanical prosthesis and when it is required in this video. Mechanical prosthesis is preferred as the life of tissue valves is very less. In mechanical prosthesis, it is expected to be 20 years of longevity and re-intervention is not frequently needed. Life-long blood thinner is given and certain blood tests are advised such as INR which has to be between 2-3. INR should be monitored every 3 weeks. When the INR value stabilizes then can be repeated every three months and the drugs needed to be adjusted. She will further explain what to do if an INR value is less or more than normal value.