Physiologic Changes in a Small Animal Model for Neonatal Minimally Invasive Surgery

Area of Science:

• Neonatal physiology
• Surgical innovation
• Animal models in research

Background:

• Minimally invasive surgery (MIS) is increasingly vital in neonatal procedures.
• The physiological effects of capnoperitoneum in neonates require further elucidation.
• This study investigates the impact of capnoperitoneum on neonatal physiology using a small animal model.

Purpose of the Study:

• To characterize the physiological impact of capnoperitoneum in a neonatal small animal model.
• To establish safe and effective parameters for capnoperitoneum in neonatal MIS research.
• To provide a foundation for future studies on neonatal laparoscopic surgery.

Main Methods:

• Twenty-four 10-day-old Sprague Dawley rats were used.
• Inhalative anesthesia with spontaneous breathing was administered.
• Carbon dioxide (CO2) insufflation was performed for 1 hour at varying pressures and flows, with sham and external controls.

Main Results:

• Capnoperitoneum was well-tolerated at 2 mmHg and 0.5 L/min.
• A significant decrease in heart rate was observed in the CO2 group compared to sham controls.
• Elevated postmortem pCO2 and reduced pH levels were noted in both CO2 and sham groups compared to external controls, with higher pCO2 in the CO2 group.

Conclusions:

• A reliable small animal model for neonatal laparoscopy was successfully established.
• The established parameters (2 mmHg, 0.5 L/min) induce physiological alterations but are well-tolerated.
• These findings support the use of this model and parameters for future research on neonatal MIS capnoperitoneum effects.