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- W2561636145 abstract "Background: Even though laryngeal mask airways (LMAs) are the most commonly used airway in paediatric anaesthesia, little is known about the assessment of respiratory mechanics in this setting.Methods: We measured respiratory resistance (R) and reactance (X) with forced oscillations at 16 Hz superimposed on spontaneous breathing following induction of anaesthesia. Children between 1.3 and 5.6 years of age (n=20) with healthy respiratory status were studied. R and X were corrected for the impedance of the LMA and other equipment parts.Results: R exhibited large flow related fluctuations ([Fig. 1][1]) amounting on average to 169% and 180% in expiration and inspiration, while the changes in X were milder. Minimum R was attained at end expiration (10.2±3.6 hPa.s/L), much lower than the mean values for whole breaths (18.1±5.1 hPa.s/L). Fast flow transitions at end inspiration resulted in high R values (16.4±5.9 hPa.s/L). All R indices were significantly (r=-0.49 … -0.75) related to height. ![Figure][2] Conclusions: LMA introduces marked flow-related nonlinearities in R, making the conventional assessment of the lower respiratory tract difficult. However, within-breath tracking identifies the flow-independent values of R and can be instructive for the proper placement of LMA.Grant Support: HSRF (105403), NHMRC (APP1050427), ANZCA (AEG13/003) and Princess Margaret Hospital Foundation (9622). [1]: #F1 [2]: pending:yes" @default.
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- W2561636145 date "2015-09-01" @default.
- W2561636145 modified "2023-09-27" @default.
- W2561636145 title "LATE-BREAKING ABSTRACT: Measurement of respiratory system mechanics via laryngeal mask airway in children" @default.
- W2561636145 doi "https://doi.org/10.1183/13993003.congress-2015.oa3498" @default.
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