A nurse is assessing a client suspected of having peritonitis. Which diagnostic test is most likely to be performed to confirm the diagnosis?
A.
Electrocardiogram (ECG)
B.
Complete blood count (CBC)
C.
Chest X-ray
D.
Abdominal computed tomography (CT) scan
The Correct Answer and Explanation is:
The correct answer is D. Abdominal computed tomography (CT) scan.
Explanation:
Peritonitis is an inflammation of the peritoneum, the tissue lining the inner wall of the abdomen and covering abdominal organs. It can be caused by bacterial or fungal infections, often following abdominal injury, surgery, or rupture of an abdominal organ (such as the appendix, gallbladder, or stomach ulcer). Peritonitis is a life-threatening condition requiring prompt diagnosis and treatment.
Abdominal CT scan is the most likely diagnostic test to confirm peritonitis because it provides detailed cross-sectional images of the abdominal structures. A CT scan can help identify:
- Areas of inflammation or infection within the peritoneal cavity.
- Abscesses or fluid collections, which are common in peritonitis.
- Bowel perforations, ruptured organs, or obstructions.
- Other potential causes of abdominal pain that might mimic peritonitis, such as diverticulitis, appendicitis, or pancreatitis.
Why other tests are less appropriate:
- A. Electrocardiogram (ECG): While an ECG is important for evaluating heart function, it is not used to diagnose peritonitis. It might be ordered if chest pain or cardiac issues are suspected but would not be useful in confirming an abdominal infection.
- B. Complete blood count (CBC): A CBC is helpful in showing signs of infection or inflammation, such as elevated white blood cells (WBCs), which are common in peritonitis. However, a CBC is nonspecific and cannot confirm the diagnosis of peritonitis alone. It would typically be part of the initial workup, but it must be followed by imaging studies like a CT scan for confirmation.
- C. Chest X-ray: This imaging test might be performed to rule out other causes of abdominal or chest pain, such as a diaphragmatic hernia or pneumonia. It may also help detect free air under the diaphragm, suggesting a perforated organ, but it is less sensitive than a CT scan for diagnosing peritonitis directly.
In conclusion, while other tests may provide supportive information, an abdominal CT scan is the most effective diagnostic tool for directly visualizing the causes and effects of peritonitis, guiding appropriate treatment decisions.