The effect of different inflation volumes on the tightness and cuff pressure of classic laryngeal mask airway in children
Objective To observe the effect of different inflation volume on the tightness and cuff pressure of laryngeal mask airway(LMA)under general anesthesia in children.Methods A total of 120 children scheduled for surgery under general anesthesia with laryngeal mask airway(LMA)were selected.The children were divided into groups A,B,C and D according to their weight,in-eluding 15 cases in group A,36 cases in group B,38 cases in group C and 31 cases in group D.The corresponding laryngeal mask(No.1,No.1.5,No.2 and No.2.5)was inserted.The cuff was slowly inflated until the LMA was slightly displaced.The cuff was connected to pressure sensor to measure pressure.The initial pressure and initial inflation volume were recorded.The pressure inside the cuff was adjusted to 60 cmH2O and the inflation volume that was required to maintain this pressure was recoded.At the same time,the leakage volume(M1)of the LAM was recorded.If the pressure inside the cuff was greater than 60cmH2O,the pressure inside the cuff was adjusted to 60cmH2O,and the air leakage(M2)of the LMA at the moment was recorded.If the LMA still was good airtight when the pressure inside the cuff was 60cmH2O,the pressure inside the cuff was tried to adjust to 50 cmH2O.The air leakage(M3)of the LMA was recorded at the moment.Results The initial volume of the LMA with sizes 1,1.5,2 and 2.5 was(3.80±0.41),(5.63±0.65),(8.33±0.94),and(11.93±1.58)ml,respectively.The insufflation volumes required to maintain the cuff pressure at 60cmH2O were(2.75±0.26),(4.95±0.54),(6.93±0.63)and(10.21±1.45)ml,respectively.The differences were statistically significant(P＜0.05).There were statistically significant differences in the air leakage volumes between the four groups among the LMA with sizes 1,1.5,2 and 2.5 under different cuff pressures(P＜0.05).Conclusions The inflation volume required to maintain appropriate cuff pressure during general anesthesia of LMA in children is much lower than the maximum inflation volume recommended by the manufacturer.After inflating the cuff based on experience,the pressure inside the cuff is far higher than the maximum recommended clinical cuff pressure.The amount of air leakage in the throat is also the largest.During general anesthesia of LMA in children,the cuff pressure should be routinely monitored to avoid over-inflation.
Classical laryngeal mask airwayInflation volume of cuffChildrenPressure
NETL
NSTL
万方数据
