My mother slipped into a diabetic coma , and was in that state for a while before anyone found her (perhaps about 12 hours). She s almost 60. She s been comatose for two days now. The doctors said if she doesn t improve in 24-48 hours, she might not improve at all. She received a CAT-scan, and allegedly scored negative for everything (no infarctions, hemorrhaging, etc.). But then why won t she wake up? Does structural integrity of the brain not guarantee functional integrity?