The Science Journal of the American Association for Respiratory Care

2012 OPEN FORUM Abstracts

A COMPARISON OF OXYGEN MASK FIO2 CONCENTRATIONS USING A RANGE OF TIDAL VOLUMES AND INSPIRATORY FLOWRATES.

Christopher Russian, Joshua F. Gonzales; Respiratory Care, Texas State University-San Marcos, San Marcos, TX

Rationale: Oxygen administration is a ubiquitous therapy in nearly every hospital setting. A multitude of delivery modalities can collectively meet the needs of every patient in every situation. Although medical equipment must undergo standards and testing requirements, we question the ability of some devices to meet the needs of a patient in certain distress situations. The purpose of this research was to measure the delivered oxygen concentration from multiple oxygen modalities while using different ventilator patterns. The research determined the oxygen masks ability to maintain accurate oxygen concentrations Methodology: The researchers utilized the ASL 5000 breathing simulator, a manikin head and five oxygen delivery modalities, e.g. simple mask, non-rebreather mask, 50% venturi mask, Oxymask™, and Misty-Ox™. The ASL 5000 breathing simulator created the following ventilator parameters: respiratory rates (12, 24, 36), tidal volumes (200, 600, and 800 mLs) and inspiratory flow rates (60, 80, 100 lpm). Oxygen concentration was measured downstream at the manikin’s carina. Results: All devices were able to meet advertised oxygen concentrations when the ventilator pattern simulated “normal” breathing, i.e. f = 12, Vi = 60lpm, Vt = 200mLs. As the ventilator parameters increased, i.e. f = 24/36, Vi = 80/100lpm, Vt = 600/800 mLs, the ability of delivery device to meet the advertised oxygen concentrations decreased substantially. Devices that utilized a venturi system appeared to perform better than those devices using the oxygen flow meter as the only supply source. Conclusion: Our results demonstrate the limitations for each device based on varying respiratory conditions. Although most of the devices we tested adequately provided sufficient oxygenation during a “normal” breathing scenario, the ability to deliver an advertised oxygen level decreased with the implementation of a respiratory distress or high minute volume scenario. Careful selection and matching of the oxygen modality with the patient’s needs is warranted. Depending on the level of respiratory distress experienced by the patient the selection and implementation of an oxygen modality could have less than optimal outcomes. These results have direct impact to healthcare providers utilizing oxygenation therapy for acute and emergent needs. Sponsored Research - None Oxygen Mask FIO2 Results