The age of my grandma is around 94 years (she is very old). The doctors asked the following two important questions.
(1) CPR (cardiopulmonary resuscitation). The doctors doesn’t advise CPR considering Mum age. They explained that the CPR process may break her bones. She may temporarily survive but then she will be in a painful situation.

(2) Life savings machines (Ventilator). There are possibilities that Doctors may use ventilator to revive her Example: In case of cardiac arrest.

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You must do everything to save her life, even if it causes pain or breaking bones