My experience was the opposite of David's. The hospital staff were very much against our stand on blood and made this very clear. "If he dies, it must be God's will!" was one of the things the anaesthiologist said. "We've got one who's refusing blood". Was what the A&E nurse shouted across the room when our son (also called David) said that he wouldn't have blood products. I asked the surgeon how David had been when they took him for surgery and he said that David had been told that he was going to die!
David's injuries? Fractures to right leg, top and bottom - no other injuries.
True to their word, David did die.
Moral of the story? Talk in depth to those caring for the injured person and make sure that you detect no animosity or prejudice. The best equipment in the world is useful, but the attitude of the staff is crucial.