Observation Of Gastric Air Intake By Compression Of Cricoid Cartilage And Pressure On Left Side Before Induction Period Of Anesthesia

Object:To compare the difference between the pre-anesthesia induction period and the left side of the annular cartilage horizontal pressure stomach air intake,to explore the effectiveness of the two compression methods.Methods:From September 2019 to December 2020,90 patients underwent general anesthesia intubation in Yiji Mountain Hospital of Southern Anhui Medical College,With written consent,randomly divided into three groups:A group without any pressure group（control group）;B group anterior square annular cartilage pressing group（annular group）;C group had the same strength cricoid cartilage level left pressing group（left side group）.Select 15 cm H₂O Pressure Control Mask for 3 min,Ultrasound measurements were used to induce the cross-sectional area of the antrum and the presence of stellate artifacts in the antrum,Assess intragastric intake,The gas volume in stomach of three groups was compared.The measured tidal volume（VT）,oxygen saturation（Sp O2）and end-expiratory carbon dioxide partial pressure（Et CO2）were also recorded at 60 s、120s and 180 s.Results:A total of 81 patients were included for the analysis,There was no significant difference in sex,age and body mass index between A,B and C groups（0.05）;There was no significant difference in actual tidal volume（VT）,end-expiratory carbon dioxide partial pressure（Et CO2）and oxygen saturation（Sp O2）s mask ventilation（0.05）;Antrum area before and after face mask positive pressure ventilation increased significantly in the three groups（P<0.05）;And between the three groups C the gastric antrum area change is the smallest,B next group,A group was the largest（P<0.01）;However,in A group（91.7%）,the positive rate of cometary artifact was the highest,B group（71.4%）followed,The C group（62.1%）was the smallest（p<0.05）.Conclusion:In 15 cm H₂O pressure controlled ventilation mode,the pressure on the left side of the cricoid cartilage level may be more effective than the pressure on the front side to prevent the intragastric intake during mask ventilation.