The number of patients with ‘‘ICU-acquired pneumonia’’ was 45 (27.3%) in the control group and 44 (28.0%) in the study group. Outcome variables (days on mechanical ventilation, ventilator-free days, SOFA day 5,correlation between the limit used for ‘‘normal GRV’’ and the incidence of diarrhea, regurgitation or abdominal distension [22, 23].