I POSTOPERATIVE CARE Intensive Care Units Example 24% Venturi At the minimum O2 flow rate of 2 litres/min, this Venturi will generate a total flow rate of 52 litres/min. To calculate the total flow rate from the same Venturi if O2 flow is increased to say 4 litres/min, simply look for 4 litres/min on the vertical axis of the graph and follow the horizontal line unit it intersects the 24% line. At this point of the intersection look to see what air flow rate on the horizontal axis is appropriate. In this case it is 100 litres/min. Add the O2 flow rate for the final mixture flow rate. 100 (air entrained) + 4 (oxygen flow) = 104 litres/min. Similar calculations can be carried out for the remaining Venturi concentrations at varying O2 flow rates. Acknowledgements: Compiled by David Prydie, BVMS, CertSAO, MRCVS with the aid of Ava Firth BS DVM MVS MACVSc DipACVECC MRCVS and Flexicare Medical Ltd © KRUUSE · Oktober 2016 · 19644 19643 Use of Oxygen leaflet INT 2016.indd 4 www.kruuse.com 17/03/17 12:46
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