Our article concentrates on two acute states, which develop less dramatically but their after-effects may be very serious: Spontaneous bacterial peritonitis and Ogilvie’s syndrome. Spontaneous bacterial peritonitis is a bacterial infection of the ascitic fluid without any intraperitoneal source of infection. Ascites is a condition of the disease but need not be clinically manifested. Spontaneous bacterial peritonitis comes usually during heavy hepatic impairment. Diagnosis can be set according: 1. Positive cultivation of ascitic fluid, 2. PMN levels higher then 250/mm3, 3. No infection, which may require a surgical intervention is apparent. Liver disease, which brings about the spontaneous bacterial peritonitis can be: 1. Chronic (e.g. alcoholic cirrhosis), 2. Subacute (e.g. alcoholic hepatitis), 3. Acute (e.g. fulminant hepatic failure). Mortality of this form of peritonitis can reach up to 46 %. The most frequent etiological factor is alcohol and viral hepatitis, the most frequent agents are E. coli and Klebsiella pneumoniae. The disease is most effectively cured by cefalosporins of the third generation. With inadequate treatment, prognosis may be poor. Intestinal pseudoobstruction syndrome has clinical symptomatology of a serious impairment with ileus without signs of any mechanical intestinal obstruction. Syndrome can be classified according to its development: 1. Acute form - acute intestinal pseudoobstruction syndrome - Ogilvie’s syndrome, 2. Chronic from - chronic intestinal pseudoobstruction syndrome. Pathogenic mechanism of the syndrome is not known. The disease is related to immobility, administration of some drugs, electrolyte imbalance and concomitant diseases (most frequently malignant tumors). Clinical symptomatology dominates nausea, vomiting, diffuse abdominal pain, constipation or diarrhoea. For diagnostics the first step should be termination of all medication, which could have causing affects, then taking native abdominal X-ray picture where gaseous intestinal distension can be prominent (coecum distended up to 9-12 cm). Identification of fluid surfaces is not usual. Endoscopic examination can exclude obstruction in the distal part of gut minimally. The most frequent complication is perforation of coecum. Pharmacological treatment relays on prokinetics. The basic intervention remains decompression by a rectal catheter or an effective coloscopic decompression with subsequent introduction of a cannula. Mortality of the disease fluctuates between 43 and 46 %.

        Key words: spontaneous bacterial peritonitis, pseudoobstruction