Dear Emad, 

here are some hints on this issue,. See also my paper Miss B and Miss P: 

Article Communicating with the ventilated patient--a literature review

Article Optimizing speech production in the ventilator‐assisted indi...

Article Lip-reading and the ventilated patient

Article When Should a Mechanically Ventilated Patient Undergo Tracheostomy?

Article Adaptation of a Communication Interaction Behavior Instrumen...

Article Return of Voice for Ventilated Tracheostomy Patients in ICU

Article Nurses' communication with patients who are mechanically ven...

here are resources from the CAHPS AHRQ tools and WHO

https://www.facs.org/~/media/files/advocacy/cahps/improvement%20guide.ashx

http://www.ahrq.gov/cahps/surveys-guidance/item-sets/PCMH/index.html

http://www.who.int/healthinfo/paper32.pdf

http://www.ahrq.gov/professionals/quality-patient-safety/hais/tools/mvp/index.html

http://www.rwjf.org/en/library/articles-and-news/2014/01/improving-communication-to-improve-patient-care-in-intensive-car.html

Hello dear colleague my experience will show if ventilated  patient had literacy can communicate us with writing and who had not literacy with hint can relate physician.

 thank you all.