How can I help my husband recover from a serious arm surgery?

My husband has just had serious surgery to his arm. His arm was cut in four places as he tripped and put his arm through a large window- He severed the artery, veins ,nerves and tendons. He lost a lot of blood and spent 4 days in hospital. He was given plasma everyday and has to build up his blood. Can you tell me how to help with this process and how to help the body with this trauma.

Regards