Mortality linked to the peritonitis is extremely high and variable between 42% and 80% when associated with a systemic framework of severe sepsis. This variability is linked to a number of risk factors, including advanced age of the patients, the presence of comorbidity, male sex, a poor nutritional status, and a number of re-operations; as well as specific characteristics related to the type of infection, the timing of surgery, the beginning of an appropriate and early antibiotic therapy.The post-operative treatment of the patient with peritonitis significantly affects the outcome of the same. The presence of peritonitis and then the seizure of large volumes of liquids and the possible state of systemic vasodilation induced by the infectious process, provide a framework of hypovolemia. There is a literature that identifies in abdominal trauma damage patient's volemic aggressive resuscitation an element of pejorative outcomes. The purpose of this work is to evaluate the clinical changes determined by a different volemic strategy.