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Sorry you are correct sent that to the wrong person.
We have discussed at length that no he would not have been ok. His heart was not able to work any more. BP aside, body temperature aside (both not good by themselves) but the real issue is that his heart was unable to do the Job it needed to do. The heart failure is what caused the BP to be low and the temperature to not come up.
Baring a feline heart transplant, which is not available, he was dying.
You know why. His heart was failing completely. He could not maintain his temperature outside the incubation chamber. He could not maintain his blood pressure, he was probably throwing clots everywhere in his body. He was dying.
It is not a feeling. It is unfortunately a fact that your cat's heart could not support life outside of a hospital and was not going to be able to come back from his complete heart failure.
The oxygen cage had temperature control as well to help with his body temp.
I am so sorry to say this but we cannot continue hashing this out again and again. We have been discussing your cat's case at length for months and you still are struggling with acceptance and healing. I am going to recommend that you see a counselor to help you move through the stages of grief as I cannot assist you further.
It is my opinion that this is not healthy for you to keep on this path that I feel is causing you unnecessary pain.
I know your cat loved you and you loved him and he would not want you to keep remember him this way over and over again.
Unfortunately, at this juncture I am going to withdraw myself from advising you further and request that when I close this question that you not contact me further as it is not helping you and I have nothing further to offer you from what we have discussed at length.
I have discussed with you at length why I know what I know. It is not just me saying these things. You also had a cardiologist that told you the same thing as well as emergency clinicians.
I wish you peace and healing.