During ventilation with pressure cycled ventilators, we have found that it is possible to predict the inspired oxygen concentration from a standard graph when the ventilators are driven by compressed air and oxygen is added to the inspiratory line. We found no significant difference between the predicted and observed inspired oxygen concentrations when (1) expired minute ventilation was measured accurately, (2) the flowmeter for oxygen delivery had a scale from 0 to 6 liters per minute and was calibrated and used with a constant pressure delivery system, (3) there was no leakage of oxygen from the line, and (4) the mixing volume of the inspiratory line was large.
Lewinsohn GE, Grassino AE, Channin EA, Tyler JM. Control of Inspired Oxygen Concentration in Pressure Cycled Ventilators. JAMA. 1970;211(6):961–963. doi:10.1001/jama.1970.03170060025005
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: