Actually I had this procedure before I had my thymectomy on April 14th. It was very hard to judge how well it worked, since surgery wipes you out completely. But I felt fantastic the day of surgery. I cant even imagine how I would have felt after surgery without it. I woke up to the doctor saying she should probably re-innubate me. I begged her to give me a lil more time or a bipap machine. She let me see my family first, thank goodness I was better enough after that, that she decided to just keep a very close eye on me.