Results: the prevalence of those criteria is significantly decreased in study group compared with the control group: ventilation time 90 hours vs 243 hours (p=0.001); ICU stay 9 days vs 16 days (p0.014); prevalence of acute renal insufficience 8 cases vs 11 cases (p=0.05); prevalence of infection 5 cases vs 9 cases (p=0.036); mortality 3 cases vs 5 cases (p=0.165).