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https://aam.ucsf.edu/oxygen-delivery-devices
Variable performance devices. These devices deliver a variable inspired oxygen concentration to the patient, which depends on the PIFR. Depending on a patient's inspiratory effort (tidal volume, 'speed' of inspiration and respiratory rate) the PIFR can often exceed the flow rate at which oxygen or an oxygen/air mixture is supplied by the device,...
https://anesthesiageneral.com/general-anesthesiaoxygen-delivery-devices/
These are classified as high flow Oxygen Delivery Devices and low flow Oxygen Delivery Devices. Classification of Oxygen Delivery Devices in non intubated patient : 1. High flow (fixed performance) delivery systems. 2. Low flow (variable performance) delivery systems.
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-2044.2007.05026.x
Mar 14, 2007 · The variable performance devices were tested at oxygen flow rates of 2, 4, 6, 8, 10 and 15 l.min −1 as delivered by an AHE ball flow meter. The fixed performance devices were assessed using the oxygen flow rates for the appropriate inserts, as recommended by the manufacturer.Author: T. A. J. Wagstaff, N. Soni
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2044.2007.05026.x
devices – variable performance, fixed performance and high flow – at two fixed tidal volumes. The respiratory rate was increased and its effect on the oxygen concentration assessed. Variable performance systems such as the Hudson mask deliver a significantly reduced oxygen concentration at high respiratory rates.Author: T. A. J. Wagstaff, N. Soni
http://www.partone.lifeinthefastlane.com/supplemental-oxygen.html
Supplemental Oxygen. Describe different systems to deliver supplemental oxygen and the advantages and disadvantages of these systems . Devices for delivery of oxygen can be classified into: Variable performance devices ; Fixed performance devices; Variable Performance Devices. Variable performance devices: Do not deliver a fixed FiO 2
https://www.researchgate.net/publication/6380909_Performance_of_six_types_of_oxygen_delivery_devices_at_varying_respiratory_rates
Variable performance systems such as the Hudson mask deliver a significantly reduced oxygen concentration at high respiratory rates. Fixed performance systems delivering 24-40% oxygen deliver appropriate oxygen concentrations across the range of respiratory rates,...
http://indiachest.org/wp-content/uploads/2018/04/Oxygen-delivery-devices_Hemanth_Oct-2017.pdf
Oxygen Delivery Systems LOW FLOW OXYGEN DEVICES HIGH FLOW OXYGEN DEVICES Cannot deliver constant FiO 2 Maintain constant FiO 2 Flow 6 - 8 L/min Delivering O 2 at very high flow Mixture of oxygen + room air Flow usually 4 times the actual Minute volume FiO 2 varies with tidal volume-Shallow breathing = less entrainment of room air (high FiO 2)File Size: 793KB
https://aam.ucsf.edu/article/simple-facemask-hudson-mask
They are variable performance devices and the maximum inspired oxygen concentration that can be achieved with these devices is up to 60%, but this is very dependent on the oxygen flowrate and the patient's respiratory pattern. The mask has side holes which are designed to allow indrawing of room air during inspiration.
https://www.frca.co.uk/article.aspx?articleid=101124
High capacity oxygen delivery devices (capacity 250-1500 ml) With these devices, O 2 flows directly into the reservoir bag, which fills whenever the patient's inspiratory flow rate is lower than the flow rate of …
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