Hi, Thank you for posting your query. It is very unfortunate that your mother has gone into unconscious state after anaesthesia. The possible reasons could be hyopxia (lack of oxygen supply to brain) or hypotension (low blood pressure leading to lack of blood flow to brain). Exact reason can be ascertained if you discuss with the treating surgeon/anaesthetist. Regarding the current condition, investigations such as brain scan and EEG may be helpful. This would also help in predicting the outcome and chances of recovery. Best wishes, Dr Sudhir Kumar MD DM (Neurologist) Senior Consultant Neurologist