Oh for sure the procedure is under general anesthesia. It was very quick (perhaps an hour) however I waited in the ER to be admitted the night before so it was performed the following day. Why did I go to the ER?....I was instructed to go by the radiologists because my scan showed that the SDH was not being reabsorbed as was expected after the diagnosis. My assigned neurosurgeon also was labeled an "expert" in MMA procedures. I was released the following day. One thing I will advise though is to really rest after this procedure. I did not, - While I was advised to resume my daily routines. I would strongly recommend to allow your body some slack to work on reabsorbing the current SDH. The MMA does stop the blood flow, but my POV is give it some time, and take it easy. Hope this helps. Please reply if I can be of any help further. All the best.