Physiological changes in transperitoneal versus retroperitoneal laparoscopy in children: a prospective analysis

Area of Science:

• Pediatric Urology
• Minimally Invasive Surgery
• Anesthesiology
• Physiology

Background:

• Surgeon preference and experience heavily influence surgical approach selection in pediatric urology.
• Objective physiological data comparing transperitoneal and retroperitoneal CO(2) insufflation in children are limited.
• Understanding hemodynamic differences is crucial for optimizing patient safety during laparoscopic procedures.

Purpose of the Study:

• To compare the cerebral and systemic hemodynamic effects of transperitoneal versus retroperitoneal carbon dioxide (CO(2)) insufflation in pediatric patients.
• To investigate objective physiological variables that may influence the choice of surgical approach in pediatric laparoscopy.

Main Methods:

• Thirty-six pediatric patients undergoing laparoscopic surgery were divided into transperitoneal (18) and retroperitoneal (18) groups.
• A standardized anesthetic technique was employed, with measurements including end-tidal CO(2), middle cerebral artery blood flow velocity, and mean arterial pressure.
• Data were collected before, during, and after CO(2) insufflation to 12 mm Hg pneumoperitoneum.

Main Results:

• Transperitoneal CO(2) insufflation caused a rapid, parallel increase in middle cerebral artery blood flow velocity, mean arterial pressure, and end-tidal CO(2) within the first 8 minutes.
• Following the initial 8 minutes, middle cerebral artery blood flow velocity and mean arterial pressure plateaued during transperitoneal insufflation, despite continued increases in end-tidal CO(2).
• Retroperitoneal CO(2) insufflation resulted in progressive increases in both middle cerebral artery blood flow velocity and end-tidal CO(2) throughout the insufflation period.

Conclusions:

• Cerebral blood flow velocity and end-tidal CO(2) demonstrate a progressive, gradual increase during retroperitoneal laparoscopy.
• In contrast, transperitoneal laparoscopy is associated with a quicker rise and subsequent plateau in these physiological parameters.
• The smaller absorptive surface area of the retroperitoneal space is hypothesized to explain these observed physiological differences.