Delta Waves

Will someone with 1hz- 4hz come out of a coma. Was told also of ischemic?(lack of oxygen). Has slight myclonic, but when walk in room and talk to patient, hold hand they do calm down. Vent down to 5, bpm is anywhere from 22 up to 30. Does show signs of awareness ie...when talking to patient has facial twitches, tries to open eyes(opens to small slits). Pupils slow in reacting.  Occasionally has coughing spree. Would like to know of any treatments, medicines, to try and get brain more into a beta or alpha state. Do constantly talk to patient. Any help greatly appreciated.