The Supreme Court also said that in professions like lawyers and doctors, the professionals cannot guarantee for the success of the case. Courts said that the advocate cannot provide guarantee to his/her client that he would definitely win the case and nor a doctor can tell his patient that is operations are always successful. And though this professions doctor and lawyer can only say that they are experienced in their work and they would do their best efforts so that they are successful.
The Supreme Court of India in an important decision said that if in case the advise given by a doctor goes wrong in some way, despite of it, no case under section 420 of Indian Penal Code or something like that can be registered against him/her.
You should also consider sending a notice to the patient's family stating his conditions, as well as the repercussions they are going to face, if the patient does not adhere to the treatment. This will reduce your legal risk, if a case of medical negligent or malpractice is lodged against you or the hospital.
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Regards.