The Application Of End-tidal Cardon Dioxide Monitoring Via Distal Gas Samples In Ventilated Neonates

Objective:To estimate the accuracy and relationship between PETCO2and PaCO2with the epidural catheter into the top of endotracheal tube and connect carbon dioxide sample tube during neonatal mechanical ventilation.Methods:50cases of full-term newborn abdominal surgery were performed under general anesthesia, the age ranged from1to28days, the weight ranged from2.55to4.0kg, ASA class I or II, were divided into two groups (n=25each):Carbon dioxide gas sample collected in group R was collected from conventional position (in proximal end), while the sample collected in group I was collected from Modified position (in distal end). Group I:using1mm epidural catheters, carbon dioxide sample tube was connected at one end, and the other end into the endotracheal tube to the endotracheal tube on the top hole of the endotracheal tube. PETCO2and PaCO2were measured after15minutes with mechanical ventilation.Results:It was obviously lower with PeETCO2value than PaCO2value in the two groups (P<0.01); There was no significant difference in PaCO2value between the two groups (P>0.05); pETCO2value was obviously higher in group I than in group R (P<0.01). It had a moderate correlation between PETCO2and PaCO2in group R (r=0.505, P<0.05), the accuracy rate (the value of PETCO2/PaCO2) was75.84%. It had a significant correlation between PETt=CO2and PaCO2in group I (r=0.956, P<0.01), the accuracy rate was90.62%.Conclusion:PETCO2detected via the modified carbon dioxide monitoring had a better correlation and accuracy with PaCO2in neonates.