Physiologic changes during CO2 and N2O pneumoperitoneum in diagnostic laparoscopy. A comparative study

Area of Science:

• Anesthesiology
• Cardiovascular Physiology
• Abdominal Surgery

Background:

• Diagnostic laparoscopy is a common surgical procedure.
• Pneumoperitoneum is essential for creating space during laparoscopic surgery.
• The choice of insufflation gas can impact physiological parameters.

Purpose of the Study:

• To compare the cardiovascular effects and acid-base balance of carbon dioxide (CO2) versus nitrous oxide (N2O) for pneumoperitoneum during diagnostic laparoscopy.
• To evaluate changes in serum electrolytes and chlorides.
• To assess the impact on patient hemodynamics and blood gas levels.

Main Methods:

• A comparative study involving 50 patients undergoing diagnostic laparoscopy.
• Patients were divided into two groups: CO2 pneumoperitoneum and N2O pneumoperitoneum.
• Monitoring included cardiovascular parameters, acid-base balance, serum electrolytes, and chlorides.

Main Results:

• CO2 pneumoperitoneum led to significant decreases in pH and pO2, and a significant increase in pCO2.
• N2O pneumoperitoneum showed statistically insignificant changes in pH, pCO2, and pO2.
• Both gases caused a significant heart rate increase, but CO2 had a more pronounced effect during recovery. CO2 also significantly decreased serum chlorides.

Conclusions:

• CO2 pneumoperitoneum causes significant acid-base and blood gas disturbances during laparoscopy.
• N2O pneumoperitoneum appears to be more stable regarding acid-base balance and electrolytes.
• N2O may offer a safer alternative for pneumoperitoneum, especially in patients with compromised cardiovascular or respiratory function.