A modified CO2/O2 Guedel airway improves capnographic accuracy compared with a CO2/O2 nasal cannula: An infant manikin study

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BACKGROUNDCapnography via a CO2/O2 nasal cannula is commonly used for respiratory monitoring during sedation. However, signal disturbances are frequently encountered, especially in young children.OBJECTIVESampling ports placed closer to the trachea have been shown to result in improved signal quality. In a manikin model of a 6-month-old infant we compared capnography from a modified Guedel airway with a CO2 port located at the tip with that from a CO2/O2 nasal cannula.DESIGNA comparison study using an artificial model of a breathing 6-month-old infant.SETTINGDepartment of Paediatrics, Inselspital Bern, Switzerland, from March 2016 to June 2016.MATERIALModified CO2/O2 Guedel airway.INTERVENTIONSCapnography using a modified CO2/O2 Guedel airway or a CO2/O2 nasal cannula was performed for tidal volumes of 20 to 80 ml (in steps of 20 ml), respiratory rates of 20 to 60 min−1 (in steps of 10 min−1) and with different O2 flows (0 to 2 l min−1, in steps of 0.5 l).MAIN OUTCOME MEASURESComparison of differences between tracheal and device CO2. Secondary outcomes included the effect of various respiratory settings and O2 flows on the CO2 difference.RESULTSThe tracheal to device CO2 difference was significantly smaller when using a modified CO2/O2 Guedel airway vs. a CO2/O2 nasal cannula: Mean ± SD, 16.8 ± 4.9 vs. 24.1 ± 5.9 mmHg, P less than 0.0001. An O2 flow of 0.5 to 2 l min−1 did not influence the tracheal to device CO2 difference with the modified CO2/O2 Guedel airway in contrast to the CO2/O2 nasal cannula where there were significant differences (P < 0.0001). The effect of various tidal volumes and respiratory rates proved to be similar in both devices.CONCLUSIONCapnography traces derived from a sample port at the tip of a modified CO2/O2 Guedel airway were more accurate than those obtained from a CO2/O2 nasal cannula.TRIAL REGISTRATIONNot applicable.

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