The inspiratory phase on a Puritan Bennett PR-2 will end when which of the following occurs?
a. The clutch plate, diaphragm, and ceramic switch are forced left.
b. Gravity is sufficient to completely close the Bennett valve.
c. The Bennett valve rotates counterclock-wise.
d. The set Sensitivity level is reached.
ANS: B
When the gas flow through the Bennett valve decreases to between 1 and 3 L/min, the force of gravity is sufficient to swing the valve completely closed, thus terminating inspiration.
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Drugs delivered by inhalation typically require the use:
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