I think my husband's c-pap just saved his life. He was feeling sick so was taking a nap while I was at work. He put the c-pap on and later called me to say that he thought he was having a heart attack. When the ambulance came they couldn't find his pulse/blood pressure. It was touch and go there for awhile. We think the c-pap (with supplemental oxygen cranked up on high) kept him going until the paramedics could get an iv going with meds. Turned out his gall bladder had gone bad and he ended up with sepsis. That is infection in the blood and it can kill you very, very fast. That was a month ago and he is doing pretty well now. Still recovering, but much improved.