Which statement describes a renal effect of pneumoperitoneum?

• A. Intraoperative oliguria is common due to decreased renal blood flow from higher intra-abdominal pressure.
• B. Renal blood flow increases during pneumoperitoneum.
• C. Postoperative oliguria should resolve within a few hours.
• D. Fluid overload is recommended to prevent renal failure.

Answer: (A)

During pneumoperitoneum, insufflating the abdomen with CO2 raises intra-abdominal pressure, which compresses the renal vasculature and raises renal venous pressure. This reduces renal perfusion and glomerular filtration rate, so urine output commonly drops intraoperatively. The effect is reversible once the pneumoperitoneum is released and perfusion improves. The other statements don’t fit: renal blood flow does not increase under pneumoperitoneum; postoperative oliguria isn’t a guaranteed outcome specific to this situation; and pushing fluid overload to prevent renal failure is not appropriate and can be harmful.