• Diuresis preserved (+ 40 ml/hour)

• Stable cardiocirculatory state without the need for vasopressor amines and, above all, without having to progressively increase the doses

• Lack of general toxic and infectious signs

• Lack of abdominal signs of diffusion; intestinal transit preserved or restored and decreased nasogastric tube fluid output

• Rapid disappearance of the alarm sign that led to a suspected diagnosis of postoperative peritonitis

• Slightly elevated neutrophil polymorphonuclear count or, if clearly elevated, a marked drop in values compared to the previous figure

• Easily correctable functional renal failure

• Lack of indication for assisted ventilation or prolongation of ventilation in a patient without preoperative respiratory failure

• Oligo-anuria

• Insufficient cardiocirculatory status with increasing deterioration

• Insufficient cardiocirculatory status with increasing deterioration

• Lack of satisfactory clinical and laboratory response to intensive medical treatment

• Abdominal signs of propagation; lack of resumption of intestinal transit or secondary arrest

• Elevated rate of leukocytosis

• Persistence of renal failure despite intensive medical treatment or worsening of renal failure

• Need for assisted ventilation