As study of effect of nebolization of hypertonic saline 5% in intubated patients for prevention of ventilatory associated pneumonia, in a randimized controlled double blind clinical trial,30 patients, 20-60 yr, male and female, divided to two groups, intervention group, nebolization NaCl5% (n=15), control group, sterile water (n=15). Inclusion criteria: intubation period less than 24 hour, no clinical and imaging manifestation of pneumonia
exclusion criteria: pulmonary infection; Acute physiology and chronic health evaluation II score II>25; active infection in admission; evidence of infection in chest X ray; immune deficiency; prescribe of high dose cortocosteroid (more than 300mg hydrocortisone); advanced cancer. In intervention group hypertonic saline% ,7 ml and in control group water sterile, 7 ml, will be nebolized until extubation or for 7 days each 6 hour., Before start of study (phase 0) and 48, 72, 120 and 144 hour sample of tracheal secretions and blood will be provided for microbial smear and culture and Interlukin-6. Potassium,Sodium, blood gas analysis, blood suger, blood urea, Creatinin, hemoglubin, hematocrit,Acute Physiology And Chronic Health Evaluation II score, Simlified clinical Pulmonary Infectious score will be meassured and recorded. we will record age, gender, cause of ICU addmision and comorbidity too.