The Science Journal of the American Association for Respiratory Care

2010 OPEN FORUM Abstracts


Rick Carter1, Kevin Crezee1, Connie Watkins1, Donald M. Null2; 1Respiratory Care, Primary Childrens Medical Center, Salt Lake City, UT; 2Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT

Backround: Primary Childrens Medical Center (PCMC) has used nasal continuous positive airway pressure (NCPAP) with conventional ventilation and humidity for many years. It was determined that a method of consistent humidification was needed while delivering high frequency NCPAP (HFNCPAP). Method: The Percussionaire Sinusoidal Bronchotron with Turbohead phasitron (Bronchotron) and Hudson Nasal CPAP Prongs were attached to a specimen cup. The Fisher & Paykel MR850 (MR850) heater, the Hydrate OMNI Humidification System (OMNI) and the Percussionaire aerosol generator (PAG) were all evaluated. For testing purposes devices were set to 37∞C and to target 100% relative humidity except the PAG (non heated device). A FLUKE 971 was used to measure relative humidity and temperature within the specimen cup. The Bronchotron was set up with an infant ventilator circuit compatible with each device. Operational pressure was set at 30psi and oscillatory cpap and pulsatile flowrate were set at low, mid, and high settings (other settings were placed in the 12 o’clock position for the duration of testing). The humidifiers were allowed time to stabilize when placed on a new settings, then measurements were obtained from the specimen cup. Measurements were taken at time of stabilization (when humidifier indicated set temperature) and fifteen minutes post stabilization using size #0 and #5 Hudson cpap prongs. The range of NCPAP pressures were from 3 to 13cmH2O. Results: We found that the MR850 and the OMNI were able to deliver adequate heat and humidity in all of the tested areas. The MR850 delivered an average of 97.3% relative humidity at 34.9∞C, but took approximately 15 minutes to stabilize. The OMNI delivered an average of 98.9% relative humidity at 33.9∞C and took less than 2 minutes to stabilize. The PAG was able to deliver an average of 71.2% relative humidity at room air temperature. Relative humidity in the room was measured at 28%. Visible humidity and rainout were also observed. All measurements are shown in the following table. Conclusion: At PCMC we currently utilize the MR850’s so it would not be cost effective to change to a different device at this time given that both devices ( MR850 and OMNI) operated very well in the testing environment provided. The OMNI may prove more cost effective over time due to reduced circuit costs. The PAG may be an alternative if power is not available, but would increase gas consumption. Sponsored Research - None