Coworker's sister came out of a stroke that left her not speaking. Between the drugs and the surgery, they brought her back with "minimal" damage (some problems with short term memory.) He should have the best of care there. But whoever let him sit in the office for that long after the first episode was no friend to him if this was a stroke or aneurism.
Johnson is undergoing "brain" surgery according to KELO news Sioux Falls.
My dad had a stroke which left him without speech and use of his right side, but he came back fairly quickly.
I think they've ruled out stroke though in the case of Senator Johnson. They seem to be reporting it wasn't a stroke, but not really saying what it is, only he's in surgery.