Peritonitis Classification and Diagnosis
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Questions and Answers

What characterizes Primary/Spontaneous Bacterial Peritonitis?

  • No obvious source of infection (correct)
  • Secondary to pancreatitis
  • Involves significant disruption of the abdominal organs
  • Requires an intra-abdominal lesion
  • Which condition is associated with Secondary Peritonitis?

  • Touch-contamination from a PD catheter
  • Iatrogenic perforation following colonoscopy (correct)
  • Chronic liver disease
  • Pre-existing ascites without infection
  • What is a common symptom of peritonitis?

  • Peritonism with abdominal tenderness (correct)
  • Severe headache
  • High blood pressure
  • Chest pain without abdominal discomfort
  • What is a potential cause of peritoneal dialysis-associated peritonitis?

    <p>Touch-contamination or exit-site infection</p> Signup and view all the answers

    In the case of a 32-year-old female with tenderness and guarding in the right iliac fossa, what type of peritonitis is she likely experiencing?

    <p>Secondary localised peritonitis</p> Signup and view all the answers

    What laboratory test is specifically included to rule out pancreatitis during the diagnosis of peritonitis?

    <p>Amylase</p> Signup and view all the answers

    Which imaging technique is best suited to identify free fluid in the abdomen without the use of contrast?

    <p>Ultrasound scan</p> Signup and view all the answers

    In the context of microbiological investigations for peritonitis, what can cause failure to culture an organism?

    <p>Delayed receipt in laboratory</p> Signup and view all the answers

    Which laboratory findings would most likely indicate inflammation/infection when diagnosing peritonitis?

    <p>Elevated CRP and WCC</p> Signup and view all the answers

    Which of the following types of specimens can be collected for microbiological investigation in cases of secondary peritonitis?

    <p>Intra-operative specimen of pus</p> Signup and view all the answers

    What is the initial management step for a patient with peritonitis?

    <p>Rest the bowel (NPO)</p> Signup and view all the answers

    Which antimicrobial combination is recommended for community-acquired secondary peritonitis?

    <p>Cefuroxime + Gentamicin + Metronidazole</p> Signup and view all the answers

    What is the role of metronidazole in the treatment of secondary peritonitis?

    <p>To provide anaerobic coverage</p> Signup and view all the answers

    Which of the following is a characteristic of piperacillin-tazobactam?

    <p>It is a broad-spectrum antimicrobial</p> Signup and view all the answers

    What is the rationale for using gentamicin in secondary peritonitis management?

    <p>To provide Gram-negative cover in case of resistance</p> Signup and view all the answers

    In what scenario would adding an antifungal agent be considered in the treatment of secondary peritonitis?

    <p>Based on local guidelines and discussions with a clinical microbiologist</p> Signup and view all the answers

    What type of bacteria does cefuroxime primarily target?

    <p>Aerobic Gram-positive cocci</p> Signup and view all the answers

    Which option accurately describes a complication that may require supportive treatment in critical care for peritonitis patients?

    <p>Sepsis or septic shock</p> Signup and view all the answers

    Which microorganisms should be covered in the empiric treatment of peritonitis?

    <p>Gram-negative bacilli and anaerobes</p> Signup and view all the answers

    What initial step is crucial for managing secondary peritonitis?

    <p>Removing the source of contamination</p> Signup and view all the answers

    What is the purpose of sending a specimen of peritoneal fluid to microbiology?

    <p>To find the causative microorganisms and their susceptibility</p> Signup and view all the answers

    Which route of administration is typically used for empiric antimicrobials in primary peritonitis?

    <p>Intravenous route</p> Signup and view all the answers

    In cases of suspected SBP, which procedure is necessary for diagnostic confirmation?

    <p>Ascitic tap or diagnostic paracentesis</p> Signup and view all the answers

    What potential complication arises from bacterial peritonitis?

    <p>Bloodstream infection (BSI)</p> Signup and view all the answers

    What should be done if resistant microorganisms are identified after culture results are available?

    <p>Escalate the antimicrobial therapy</p> Signup and view all the answers

    Which of the following is a correct statement regarding anaerobes in co-amoxiclav treatment?

    <p>Co-amoxiclav is effective against some Gram-positive and Gram-negative anaerobes</p> Signup and view all the answers

    What is a common complication associated with peritonitis?

    <p>Volvulus</p> Signup and view all the answers

    Which type of peritonitis is most likely in a patient with alcoholic liver cirrhosis and ascites?

    <p>Spontaneous bacterial peritonitis</p> Signup and view all the answers

    Which organism is commonly found in peritoneal pus after perforation of a diverticulum?

    <p>Escherichia coli</p> Signup and view all the answers

    Which empirical antibiotic regimen is recommended for treating secondary peritonitis?

    <p>Cefuroxime and metronidazole</p> Signup and view all the answers

    What diagnostic procedure is essential for suspecting peritonitis?

    <p>Specimen of peritoneal fluid sent to microbiology</p> Signup and view all the answers

    What is a key management strategy for peritonitis?

    <p>Drainage and source control along with antibiotic therapy</p> Signup and view all the answers

    Which condition does not fall under the categories of peritonitis?

    <p>Chronic peritonitis</p> Signup and view all the answers

    Why is anaerobic coverage necessary in managing secondary peritonitis?

    <p>Anaerobes are frequently present in normal flora of the gastrointestinal tract</p> Signup and view all the answers

    Study Notes

    Peritonitis Classification

    • Peritonitis can be primary (spontaneous bacterial peritonitis, aka SBP), secondary, or peritoneal dialysis (PD)-associated.
    • SBP has no obvious source and may be seen in patients with pre-existing ascites (chronic liver disease).
    • Secondary peritonitis is caused by intra-abdominal lesions/spillage like perforation of an organ, tumor, penetrating injury, acute pancreatitis, and post-procedure complications.

    Peritonitis: Clinical Features

    • Peritonism is the term for signs and symptoms of peritonitis.
    • Symptoms include abdominal pain, bloating, feeling unwell, nausea/vomiting/anorexia.
    • Abdominal pain may radiate to shoulders or back and worsen on movement.
    • Fever is also common.
    • Peritonitis can be localised or generalised.

    Peritonitis: Diagnosis

    • Diagnosis relies on clincial signs, laboratory testing (FBC, renal profile, liver function, coagulation, CRP, amylase, lactate, blood for group & save/cross-match, venous/arterial blood gas, procalcitonin), and microbiology.
    • Expected findings include elevated CRP and WCC.
    • Microbiology investigations include blood cultures, urine MC&S, and peritoneal fluid specimens.
    • Radiology (abdominal X-ray (erect), CT scan, ultrasound) can be used to detect free air or fluid.

    Peritonitis: Management

    • Initial management focuses on bowel rest, large-bore IV cannula, analgesia, and IV fluids.
    • Further management depends on clinical presentation - may require surgical exploration.
    • Sepsis/septic shock requires supportive care in a critical care setting (oxygen, ventilation, inotropes, dialysis).

    Management of Secondary Peritonitis

    • Antimicrobials:
      • Empiric choice depends on clinical scenario, likely microorganisms, and local guidelines.
      • Community-acquired: 2nd generation cephalosporin (cefuroxime) + aminoglycoside (gentamicin) + metronidazole.
      • Hospital-acquired: β-lactam/β-lactamase inhibitor combination (piperacillin-tazobactam) + aminoglycoside (gentamicin).
      • Antifungal agent (caspofungin or fluconazole) may be recommended.
    • Source control: Remove source of contamination by draining abscess, performing appendicectomy, bowel resection, or repairing perforation.
    • If laparotomy is performed, peritoneal washout or ‘lavage’ is necessary. Specimen of fluid/faecal material should be sent promptly to microbiology.

    Management of Primary Peritonitis (SBP) or PD Peritonitis

    • Usually monomicrobial infection, but occult perforation (polymicrobial) should be excluded.
    • Peritoneal fluid specimens are crucial for diagnosis.
    • Treatment can be IV (SBP) or intraperitoneally (IP) via PD catheter.
    • PD catheter may need removal or exchange.

    Complications of Bacterial Peritonitis

    • Bloodstream infection (BSI)
    • Sepsis/septic shock
    • Localised abscess/collection
    • Adhesions - fibrous scar tissue forming abnormal attachments between organs.
    • Adhesions can cause pain, volvulus, and intestinal obstruction.

    Key Points

    • Peritoneal fluid specimen is crucial for determining the causative microorganisms and their susceptibility.
    • Empiric antimicrobial therapy should cover likely microorganisms and include anaerobic cover for secondary peritonitis.
    • Once results are available, target/rationalise antimicrobial therapy based on susceptibility results.
    • Failure to collect and send a peritoneal fluid specimen hinders appropriate management.

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    Description

    This quiz covers the classification, clinical features, and diagnosis of peritonitis. It focuses on understanding primary, secondary, and dialysis-associated peritonitis, along with the key symptoms and diagnostic methods. Perfect for medical students and healthcare professionals looking to enhance their knowledge in this area.

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