The pressure manometer in-line with a bubble CPAP setup is reading higher than the depth of the expiratory limb in the liquid-filled bottle. This is most likely caused by which of the following?
a. Set flow rate above 5 L/min
b. Set flow rate below 5 L/min
c. Fluid in the inspiratory line
d. Improperly placed manometer
ANS: A
The set flow rate for a bubble CPAP setup is 5 L/min. Flow rates above 5 L/min result in higher pressures than those anticipated by the submersion depth of the distal tubing. Flow rates lower than 5 L/min would not be able to maintain the bubble CPAP level needed for a given depth. Improper placement of the manometer could result in lower pressures than expected, because the manometer would not be reading pressure on exhalation. Fluid in the inspiratory line may drop the pressure reading by the manometer, because it would cause back pressure behind the fluid.
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