Support Apnea Board & OSCAR
Changes
662 bytes removed,
02:51, 11 March 2018
=What is the oxygen concentration in the diluted CPAP circuit?=
The equation to calculate concentration from flow is:(oxygen flow rate (litres) at 100% O2 + air volume (litres) at 21% O2) / Total air volume = oxygen concentration %therefore, at 1 litres/minute oxygen addition and assuming a total CPAP flow of 60 L/min:(1-L/min x 100) + (60-L/min x 21) = 1360 /60-L/min = 22.% Oxygen.at 1 litre/minute oxygen(3-L/min x 100) + (60-L/min x 21) = 1560 / 60 L/min = 26% oxygen. Any variable can be changed based on available data. If the flow rate is 40 L/min from the CPAP, the oxygen concentrations will be higher. If leaks are present or pressure results in a higher average vent-rate, the oxygen concentrations will be lower.Pending
Donate to Apnea Board
