Yes DKA can lead to cerebral edema. Moreover, DKA can cause Hypoglycemia which can cause coma if left untreated.
Category: Management of Diabetic Ketoacidosis
Yes, it can. As the insulin levels become low again DKA can reoccur again.
If admitted to the hospital it shall take one to 4 days to recover from DKA. The key to recovery is to get fast treatment.
Type-1 diabetes people are at more risk for this disease. But yes Type 2 diabetic patients can also suffer from DKA.