Effects of Carbon Dioxide Pneumoperitoneum on pH Value of Gtastric Mucosa During Infantile Peritoneoscope Operation

Objective To explore the effects of carbon dioxideCO2  pneumoperitoneum on pH value of gastric mucosapHi. Methods 40 cases of infantile macrocolon radical operation were performed under peritoneoscope with CO2 pneumoperitoneum.Gastric juice was drawed to use assay the CO2 pressure of gastric mucosaPiCO2 before pneumoperitoneum,at 30 min after pneumoperitoneum and after deflation respectively.At same time,the arterial partial pressure of CO2 PaCO2,arterial pressure of oxygen PaO2 and pH valuepHi as well as O2 pressure in gastric mucosaPiO2 were also monitored,obtained parameters of blood gas were putted up into the Henderson-Hasseribach formula,final the pHi value was calculated out. Results PiCO2 value in the pneumoperitoneum period and at 30 min after deflation were obviously increased than that in before pneumoperitoneumall P0.05.pHi value in the pneumoperitoneum period and after defletion were remarkable lower than that of before pneumoperitoneumP0.05;PiO2 value had not significantly changes in before and after pneumoperitoneum period.Arterial PaCO2 in the pneumoperitoneum and at 30 min after deflation were increased than those of before pneumoperitoneumP0.01,but pH value was lower than that in before pneumoperitoneumP0.01. Conclusions Period of the infantile peritoneoscope operation,gastric mocosa exists ischemic hypoperfusion phenomenon under CO2 pneumoperitoneum.