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Many CPAP users also require supplemental oxygen.
=Oxygen Bleed Adapter=The Oxygen Bleed Adapter is provided inserted into the CPAP /BPAP circuit to allow oxygen to be mixed into the respiratory circuit using an ". Oxygen is always provided at higher pressure at a set flow-rate, so the dose can be calculated. Several bleed adapters are available, and they are inexpensive. The images below show oxygen bleed adapters for both standard and heated tubing. [[file:oxygen bleed adapter Standard.png]] [[file:oxygen bleed adapter"heated hose. png]] =Physical Characteristics of an Oxygen Bleed=
Concentrated oxygen is generally delivered at pressures in excess of 15 psi, and is metered by Flow.
CPAP air pressure is delivered at pressures less than 30 cm H2O.
The typical CPAP or Bilevel respiratory circuit flows 40 to 80 L/min of air volume in the absence of large leaks. (our example will assume 60 L/min)
=What is the oxygen concentration in the diluted CPAP circuit?=
(oxygen flow rate (litres) at 100% + air volume (litres) at 21% O2) / Total air volume = oxygen concentration %
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