my father in law has had his thyroid removed, has diabetes, has a stint in his heart a bad back and weighs about 300lbs. He had to be taken to the er with shortness of breath, hallucinations, he has had a lot of confusion for awhile but it was much worse. he already took 40 a day lasix. Hehad fluid around lungs and heart low o2 levels. They upped his lasix to 80 put o2 on him. They had to keep the o2 at 15 otherwise his levels wouldn't stay up. Lung infection also discoved. Heart only working at 40% then co2 up to 90and unresponsive. Now on a ventilator co2 down to normal. what is likelyhood of brain damage? Any other input apprectiated. Family is trying to make some hard decisions.