The Contrast Study Of Ventilatory Efficacy By Laryngeal Mask Airway Or Endotracheal Tube On The Neonatus With Different Ventilatory Mode

Subject: Comparison of ventilatory efficacy by laryngeal mask airway（LMA） or endotracheal tube on the neonatus with different ventilatory mode.Objective: The relationship of peak inspiratory pressure （PIP） and tidalvolume （TV）, the effect of different respiratory rates to the PETCO₂werecompared using laryngeal mask airway or endotracheal tube on the neonatuswho underwent abdominal operation with pressure controlled ventilation （PCV）and volume controlled ventilation （VCV）.Methods：Fifty neonatus undergoing abdominal operation （since he wasborn24hours to28days）, the score of Apgar＞7and the weight＞2.5kgafter he was born, were enrolled. After induced by sevoflurane, insertion of theLMA （L group） or endotracheal tube （E group） was randomly, and thenmonitored the PETCO₂and the vital sign. Each neonate was randomly receivedLMA or endotracheal tube with different ventilatory mode, the rate35countsper minute, the rate of inspiration and expiration1:2, the PEEP5cmH₂O. Thepressure of inspiration were signed16cmH₂O，18cmH₂O and20cmH₂O, at thesame time, monitored the range of the PETCO₂. More than15min afterventilation, record the VT, PETCO₂、HR、BP. All values were expressed as themean value after measuring there times.Results:（1） Under the PCV, with the14～18cmH₂O PIP, there were notsignificant differences in the VT and PETCO₂between the L group and the Egroup （p>0.05）, but with the20cmH₂O PIP, there was difference of VT betweentwo groups. There was no difference of PETCO₂with the different respiratoryrates between two groups （p>0.05）.（2） Under the VCV, there were not significant differences in the PIP and the PETCO₂with the same VT （p>0.05）between the two groups.（3）Under the PCV and VCV, with14～20cmH₂O PIP,there were not significant differences in the PIP and the PETCO₂by Using theLMA （p>0.05）.Conclusion: During the general anesthesia on the neonatus, under thePCV, with14～18cmH₂O PIP, using the LMA and Endotracheal tube canensure the efficacy of the ventilation and maintain the normal PETCO₂. Underthe PCV, with14～20cmH₂O PIP, the VT was significant higher in the E groupthan in the L group.