<s>[INST] My daughter in laws dad had a heart attack today.. He was rushed to hospital with no pulse, she said that they induced a coma, bc he needs bypass surgery and have to see if he is responsive, it needs 48 hrs. they wont know until monday. He is critical, tomorrow he will be 68. he is not responsive now, and was put on a respirator, now she thinks he is breathing on his own.. what does all this mean, and why do they induce a coma, [/INST] HIT hank for asking to ChatDoctorLook you have wrongly understood, in medical come is always the bad consequences of disease, medicine does not push the patients in coma, but of course medicine can induce the general anesthesia which is reversible and safe too, while coma is cerebral pathology and most of the time it is irreversible, your daughter must have been induced GA for some procedure, Respirator does not induce the coma it is life support machine, hope this information helps you have nice day. </s>