The Science Journal of the American Association for Respiratory Care

2012 OPEN FORUM Abstracts

DOES THE RAM CANNULA DELIVER THE SET CPAP PRESSURE WITH BUBBLE CPAP? A BENCH TEST.

Matt McNally; Respiratory Care, Dartmouth Hitchcock Medical Center, Lebanon, NH

Background: The Ram Cannula (Neotech) has been marketed as an interface for non-invasive ventilation for infants. The manufacturer has provided literature form bench testing supporting its use with NIPPV but not with Bubble CPAP. We aimed to test whether the airway pressure delivered was equal to what it was set at on the bubble bottle. Methods: The ASL 500 test lung (IngMar Medical) was used in conjunction with a 3D scale model of a 28 week gestational age infantÂ’s upper airway. The breathing parameters on the ASL were configured to mimic those of a 28 week gestational age infant. The Ram Cannula was placed on the nasal model and connected to a CPAP circuit comprised of the Fisher and Paykel RT236 circuit and the Babi PAP(B&B Medical) CPAP bottle. The flow was set at 6 liters per minute. The CPAP level was set at 5 then 8 cmH2O. Measurements were recorded after one minute of stable breathing. Results: The mean airway pressure on a set CPAP of 5 cmH2O was 5.5 cmH2O with a SD 0.2. The mean airway pressure when set at 8 cmH2O was 8 cm H2O with a SD 0.2. Conclusion: The Ram Cannula is capable of delivering the pressure set on the bubble CPAP bottle within the manufacturerÂ’s specifications of +/- 1 cmH2O. This is despite the diameter of the Ram prongs and the fact that it does not completely seal the nares. One of the limitations of our test was that the nasal model did not account for any loss of gas orally, because the nasal model did not include a mouth. Sponsored Research - None