A 55 years old known diabetic, hypertensive, having the stent for CAD on medication, living alone on medications c/o uneasiness in the chest, he took tab nitroglycerin sublingually and informed his friend who shifted him to the emergency ward of the private hospital. Doctor on duty told, that he came with cardiac arrest and was resuscitated which took a little longer time and became unconscious and started having seizures. RBS 585 mg%, BP unrecordable, CO 2 90% in blood. His attendants who were staff members were told that his brain is dead probably.

After 18 hours of intensive treatment, BP became recordable, RBS 300 mg%. My query since, no family member is near him, doctors have told critical condition and the only miracle can save him. For how long, he should be observed before taking the decision of removal of life support?