The Science Journal of the American Association for Respiratory Care

2011 OPEN FORUM Abstracts

COMPARISON OF RELATIVE HUMIDITY AND TEMPERATURE WITH TWO TYPES OF HUMIDIFICATION DEVICES.

Cynthia C. White, James Johnson, Thomas J. Cahill; Respiratory Care Division, Cincinnati Children's Hospital Medical Center, Cincinnati OH, OH

Adequate humidification plays a large role in managing pediatric patients with artificial airways. Current humidification practice for most pediatric patients receiving mechanical ventilation is active heated humidification. The Medisize Gold Booster humidification system combines an HME option with a Teflon heater unit that also provides active humidification as opposed to a standard humidifier. We tested the hypothesis that there was no difference in delivered relative humidity with the Booster HME system (Medisize, Finland) in comparison to the Fisher Paykel 850(F&P) heater set in invasive mode utilizing a heated wire Evaqua circuit(Cardinal Healthcare)in a pediatric lung model. Methods: A Servo i (Maquet, Sweden) ventilator was calibrated according to manufacturer's recommendations and set up with a pediatric/adult Evaqua circuit. A TTL Lung model 5601i (Michigan Instruments, Grand Rapids, MI) was set with a lift bar, and driven by a second Servo i ventilator to achieve a tidal volume of 100mL and 200mL respectively and a RR of 30 BPM. A thermohygrometer was placed at patient wye to measure RH and Temperature with both the Medisize System and Fisher and Paykel system at both tidal volume settings. Results: RH measured with both humidification devices and at both tidal volume settings was 99.9%. Temperature at the wye with the Medisize system was 24.8 degrees C. Temperature measured with the F&P system measured 29.8 degrees C. The Medisize system took a slightly longer period of time to reach full RH than the F&P system set up with the Evaqua circuit. Conclusion: Both the F& P 850 Heater with Evaqua circuit and Medisize HME booster system were able to provide 100% RH in our simulated pediatric lung model. More clinical testing is required to assess deadspace, patient tolerance, and condensate produced by the Medisize device. A future battery pack for the Medisize device may prove useful for providing active humidification to ventilated patients during patient transport and time off unit. Sponsored Research - None