How does suspended animation work?
Well this kind of surgery involves stopping your heart and taking your heart out, causing you to basically freeze in time, but then while you are bloodless you are filled with salt water which causes you to freeze in time.
Do you think this is a safe practice?
Well based on the kind of person you are testing on. If the person is in a life and death situation then i would say it's safe, along with if the person was going to die anyway. But if the person is sick and could be cured with medicine or some other kind a drug then it shouldn't be done on the person.
What are other ways doctors could prevent people from dying of traumatic wounds?
By freezing people's cells the person won't or shouldn't feel pain and also if it's serious this treatment could help prevent it and cure the person. And once their cured they won't have to die anymore.