All are true about primary bacterial peritonitis, EXCEPT:
**Primary Bacterial Peritonitis Core Concept**
Primary bacterial peritonitis (PBP) is a spontaneous infection of the ascitic fluid in the absence of an obvious intra-abdominal source of infection. It is a serious complication of cirrhosis and other conditions leading to ascites. The pathogenesis involves translocation of bacteria from the gut to the ascitic fluid, where they multiply and cause infection.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of PBP. The condition typically occurs in patients with cirrhosis, who have impaired liver function and a dysfunctional immune system. The gut is a common source of bacteria, and in patients with cirrhosis, the gut barrier is compromised, allowing bacteria to translocate into the ascitic fluid. The ascitic fluid is usually sterile in healthy individuals, but in patients with cirrhosis, it becomes a fertile ground for bacterial growth.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because PBP is typically seen in patients with cirrhosis and not in patients with nephrotic syndrome. While both conditions can lead to ascites, the pathogenesis and risk factors are different.
**Option B:** This option is incorrect because PBP is not typically seen in patients with a history of recent abdominal surgery. The infection is usually spontaneous and not related to a surgical procedure.
**Option C:** This option is incorrect because PBP is not typically seen in patients with a history of recent abdominal trauma. The infection is usually spontaneous and not related to trauma.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of PBP is the absence of an obvious intra-abdominal source of infection. Patients with PBP typically present with abdominal pain, fever, and ascites, but the ascitic fluid is usually sterile on initial analysis. A high index of suspicion is required to diagnose PBP, and diagnostic paracentesis is essential to confirm the diagnosis.
**Correct Answer:** D