Peritonitis is the inflammation of the peritoneum, the thin layer of tissue lining the abdominal cavity, often resulting from an infection, injury, or underlying medical condition. It can lead to serious complications, including intra-abdominal abscess formation, which is a localized collection of pus within the abdominal cavity. Prompt diagnosis and treatment are crucial to prevent severe complications such as sepsis, which can be life-threatening.

Individuals are at an increased risk for peritonitis if they have conditions such as appendicitis, diverticulitis, or perforation of the gastrointestinal tract. Other risk factors include compromised immune systems, chronic liver disease, or prior abdominal surgeries that may predispose one to infection. Furthermore, peritoneal dialysis patients are particularly vulnerable to develop peritonitis due to the potential introduction of pathogens during the dialysis process.

Symptoms of peritonitis may include severe abdominal pain, tenderness, and rigidity, often accompanied by fever and chills. Patients might also experience nausea, vomiting, and a decreased appetite, along with changes in bowel habits such as constipation or diarrhea. The acute presentation may lead to abdominal distension and altered mental status in severe cases.

Peritonitis is primarily caused by an infection that spreads to the peritoneum, often due to perforation of the gastrointestinal tract, such as in appendicitis, diverticulitis, or peptic ulcer disease. Other causes include trauma to the abdomen, infections like tuberculosis or fungal infections, and even complications from peritoneal dialysis. An intra-abdominal abscess, which often accompanies peritonitis, is typically the result of localized infection following surgical procedures, perforated organs, or pancreatitis, leading to the accumulation of pus within the abdominal cavity.

Diagnosis of peritonitis involves a combination of clinical assessment, laboratory tests, and imaging studies. Healthcare providers may perform a physical examination to check for abdominal tenderness, and blood tests may reveal elevated white blood cell counts indicative of infection. Imaging techniques, such as ultrasound or computed tomography (CT) scans, are utilized to identify the presence of fluid collections like abscesses and assess the extent of the disease.

Treatment of peritonitis usually involves urgent medical intervention, primarily with broad-spectrum intravenous antibiotics to combat the infection. In many cases, surgical intervention may be necessary to address the underlying cause, such as repairing perforations or draining abscesses. For intra-abdominal abscesses specifically, percutaneous drainage guided by imaging techniques or exploratory surgery may be required to remove the pus and infected tissue effectively.

Preventative measures for peritonitis focus on addressing underlying conditions and optimizing surgical care during abdominal procedures. Maintaining strict hygienic practices in patients undergoing peritoneal dialysis is essential to minimize infection risk. Prompt treatment of intra-abdominal infections and timely surgical intervention when necessary are critical in preventing the onset of peritonitis.