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Respiratory Care |

Controlled Oxygen Therapy in Clinical Practice: Fixed or Variable Venturi Mask?

Julia García Fuertes, MD; Veronica Hernandez Garcia, MD; Francisco Javier Ribas Solis, MD; L. Tomas Lopez, MD; P. Sodradillo Ecenarro, MD; M. Azpiazu Blocona, MD; C. Egea Santaolalla, MD; B. Lahidalga Mugica, MD; V. Zorrilla Lorenzo, MD; A. Rivas Guerrero, MD; L. Cancelo Diaz, MD; D. Bravo, MD; Jose Luis Lobo Beristain, MD
Author and Funding Information

Txagorritxu Hospital (H.U.A), Vitoria-Gasteiz, Spain


Chest. 2014;145(3_MeetingAbstracts):550A. doi:10.1378/chest.1788695
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Abstract

SESSION TITLE: Respiratory Support Posters

SESSION TYPE: Poster Presentations

PRESENTED ON: Saturday, March 22, 2014 at 01:15 PM - 02:15 PM

PURPOSE: The use of a Venturi mask has the advantage of administrating an accurate concentration of oxygen that remains constant while we treat our patients. However, there are many venturi mask models. The objetive of our study is to analyze the reliability of various oxygen delivery devices that are based on Venturi principle.

METHODS: Six different oxygen delivery devices were tested. From each device, three units were randomly chosen. Every unit was tested for all FiO2 that the model was able to administrate. In order to obtain the desired FiO2, nine measurements were done per unit: using the flow recommended by the manufacturer and +/- 50% from the flow recommended by the manufacturer (Nine measurements: three per each flow). In total, 1053 measurements were taken. To do the measure it was used a Venturimask with a T piece connected to constant Oxygen flow coming from an oxygen wall jack, controlled by an oxygen flowmeter indicator (TaemaFloval). The FiO2 measurement was tested by a sensor membrane (NUOVAE-17/J). The Reliability was defined by the oxygen concentration that is appropriate when the values obtained complied with the European normative (±1% when O2 concentrations <35%, ±2% between the 35 to 40%, ±3% to 50% and ±4% for 60%).

RESULTS: When O2 flows recommended by the manufacturer are administrated, not all masks comply with the normative, being more reliable the fixed intersugical system. Fixed models comply with the regulation more than the variable models (except for the variable intersurgical model). Reducing (-50%) or increasing (+50%) O2 flow recommended by the manufacturer, do not produced significant variations in FiO2 obtained, compared to the FiO2 obtained with O2 flow recommended by the manufacture.

CONCLUSIONS: 1. Fixed venturi systems are more suitable to the normative that variable venturi systems. 2. We should be careful choosing a variable venturi system, especially when low FiO2 is needed. 3. In our study, we found no variations for FiO2, when oxygen flow recommended by the manufacturer was reduced or increased (+/- 50%).

CLINICAL IMPLICATIONS: When an accurate concentration of oxygen is needed for the patients a fixed venturi system should be the option.

DISCLOSURE: The following authors have nothing to disclose: Julia García Fuertes, Veronica Hernandez Garcia, Francisco Javier Ribas Solis, L. Tomas Lopez, P. Sodradillo Ecenarro, M. Azpiazu Blocona, C. Egea Santaolalla, B. Lahidalga Mugica, V. Zorrilla Lorenzo, A. Rivas Guerrero, L. Cancelo Diaz, D. Bravo, Jose Luis Lobo Beristain

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