TY - JOUR T1 - Humidification of inspired oxygen is increased with a pre-nasal cannula compared to intranasal cannula JF - European Respiratory Journal JO - Eur Respir J VL - 42 IS - Suppl 57 SP - P3357 AU - Dominic Dellweg AU - Markus Wenzel AU - Ekkehard Hoehn AU - Olaf Bourgund AU - Peter Haidl Y1 - 2013/09/01 UR - http://erj.ersjournals.com/content/42/Suppl_57/P3357.abstract N2 - Background: Oxygen can be given pre- or intra-nasally ± humidification. How this impacts intra-nasal humidity has not been investigated.Objective:To investigate nasal humidity during pre-nasal and intra-nasal oxygen administration with and without humidification.Method:We first developed and validated a sampling and analysis system.By means of this system we measured nasal humidity in 12 individuals who received nasal oxygen with an intra-nasal and pre-nasal cannula at different flows ± humidification.ResultsIn our subjects intranasal humidity dropped significantly from 40.3 ± 8.7 % to 35.3 ± 5.8 %, 32 ± 5.6 % and 29.0 ± 6.8 % at a flow of one, two and three litres respectively when oxygen was given intra-nasally without humidification (p=0.001, p<0.001 and p<0.001 respectively).We observed no significant change in airway humidity when oxygen was given pre-nasally without humidification.Conclusion:Pre-nasal administration of dry oxygen achieves similar levels of intranasal humidity as intranasal administration in combination with a bubble through humidifier. Pre-nasal oxygen simplifies application and may reduce therapy cost. ER -