Hello Thanks for asking the question. I am Dr Adil. After going through the details of your question, i noticed that your patient has many problems, she has mitral valve stenosis, prosthetic valve, i presume that mitral valve stenosis may also caused her atrial dilatation and atrial fibrillation that had lead to the embolic stroke. Now she also has sub-dural and sub arachanoid hematoma. So these are so many problems, one correct one problem at a time, and all these problems require surgery and for surgeries and anesthesia one needs a good and sound heart and she is also on mechanical ventilation, and long term mechanical ventilation also compromise the function of lungs. I am not seeing a good chance of her recovery. But in medical sciences, miracle do happens. I wish her well and hope, may she wake up soon. Regards.