IRCT201110237874N1 IRCT 2011-12-18 Vice chancellor for research, Hamadan University of Medical Sciences Effect of progressive change position program on lung health in patients undergoing mechanical ventilation Effect of progressive change position program on lung health in patients undergoing mechanical ventilation 2011-11-01 anticipated 60 Complete https://irct.ir/trial/8309 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive. 2-3 Mechanical ventilation pneumonia. Intervention 1: The Intervention group: Implementing of progressive change position program Progressive change position program is gradually putting the patient in the chair position that 3 times a day and in three different shifts, for 4 days, will be done and Includes the following steps: The head of the bed at an 45 degrees and the foot of the bed an -75 degrees for 15 minutes; The head of the bed at an 60 degrees and the foot of the bed an -75 degrees for 15 minutes; The head of the bed at an 75 degrees and the foot of the bed an -75 degrees for 30 minutes. In this study, the ergonomics rule is used to determine the angles of the bed. In this study, drug or chemical composition will not be used. Intervention 2: In control group, do not any intervention. In this group, as intervention group, routine work is performed.