The Science Journal of the American Association for Respiratory Care

2011 OPEN FORUM Abstracts


Joel M. Brown, John S. Emberger; Christiana Care Health System, Newark, DE

Background: HFOV has been an accepted method of low tidal volume ventilation for several years. The SensorMedic 3100 B is the only device that is FDA approved to provide this form of ventilation for the adult population. One well known problem with this device is that it doesn't have a back up battery that allows the unit to maintain ventilation during brief power outages. Many medical facilities have considered using external uninterrupted power source (UPS) to fix this issue. The UPS is a device that provides emergency power to a designated appliance by using a previously charged battery. In this bench study we evaluated the ability of two commercially available UPS units with and without an AC power source. We also evaluated how long these UPS unit's battery sources would provide power to the 3100B during low, medium and high clinical settings. Methods: We used a Michigan TTL test lung with the compliance set at 30 ml/cm H20 and a 5 cm H20/L/sec airway resistance. Two commercial grade battery backup power sources were evaluated: APC Back UPS Pro 1500 (APC) and the Tripp Lite OmniSmart 350 (TLOS). Both batteries were recently purchased and were not used prior to this study. The UPS function was observed with AC power available and with the backup battery power activated. Each objective was observed at following 3100B clinical settings: Low (MAP 20, Power 4.0, It 33% and Hz 5), Medium (MAP 30, Power 6.0, It 33% and Hz 4) and High (MAP 40, Power 10.0, It 50% and Hz 3). The battery backup time (BBT) was observed from AC power removal until the HFOV unit depressurized and failed to ventilate. A total of 3 trials where performed at each clinical setting. Both UPS devices were charged for a minimum of 24 hours between trials. Results: The APC performed normally with AC power under all clinical settings. The TLOS worked normally during the Low and Medium clinical settings. The TLOS spontaneously switched to the battery backup mode in all of the High clinical settings trials. Both units were able to provide adequate emergency BBT. The APC provided the longest BBT during Medium and Low clinical setting trials. See the attached table for additional information. Conclusion: Although both UPS systems provided adequate BBT, the TLOS was unable to remain under AC power during the High HFOV clinical setting trials. The APC unit was able to perform in all clinical conditions while providing adequate battery back time for emergency power loss.
Sponsored Research - None
Battery Backup Time (BBT) at 3 Different HFOV Settings