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the terminal flow nob on the bennett PR-2 is used for what?
it is provided for minor leak compensation
on the Bennett, compressed gas from a 50-psig gas source enters the ventilator through a brass filter, and it is then directed to a _____ ____, which then flows to the ____ _____.
gas flows through the brass filter to the DILUTER REGULATOR and then to the BENNETT VALVE.
what is the Bennett valve consit of?
a counterweighted, hollow drum w/ attached vanes
what does the drum vane in the bennett do?
it creates a barrier between atm and circuit pressures.
1. when is inspiration triggered?
2. what controls the sensitivity of the valve?
3. what does the drum do as sensitivity is increased ?
1. insp is triggered when the pt removes enough volume from the tubing to create a pressure gradient of 0.5 cm H20 across the valve, thus causing the drum to rotate counterclockwise.
2. gas that flows to the low pressure regulator which is then directed to the bennett valve
3. as sensitivity increases the gas flow rotates the drum counterclockwise toward inspiration making it easier for the pt to trigger the ventilator
In the Bird device which side is exposed to atm pressure?
the left side through a port in the left corner of the box
in the Bird, during inspiration, negative pressure generated by the pt (along w/ atm pressure from the left compartment) causes the diaphragm to move which side?
moves the diaphragm to the right, away from the left compartment
in the Bird, when does exhalation begin?
when the diaphragm, clutch plate, and ceramic switch are forced to the left, occluding gas flow into the respirator.
in the Bird, what is needed to end inspiration?
depends on the magnetic attraction between the right clutch plate and the corresponding magnet.
name 3 types of PAP that can; enhance bronchial hygiene, reduce air trapping, help mobilize secretions, and prevent atelectasis.
CPAP,EPAP & PEP
what is CPAP?
involves the application of positive pressure to the pt airway throughout the resp cycle. (pressure is constantly maintained between 5 and 20 cm H20 during both inspiration and expiration. pt breathes from a pressurized circuit that incorporates a threshold resistor in the expiratory limb.
how does EPAP differ from CPAP?
it involves the creation of PAP only during expiration.
pt generates a sub-atm pressure on inspiration and then exhales against a threshold expiratory resistance. airway pressures during EPAP can be set at 10-20 cm h20
what is PEP?
similar to CPAP and EPAP but its less cumberson and works great for people with CF.
the pt exhales against a fixed orifice that creates a back pressure that helps maintain airway patency in pts that experience airway closure (bronchiectasis)
why is thera pep convientent?
thera pep provides a series of fixed orifices that can accomodate pts over a wide variets of lung capacities
what happens when the fixed orifice on PEP is small ?
what happens when the expiratory flow is high?
the pt must maintain pressures of ___ to ___cm H20.
1. the smaller the resistors orifice, the greater the expiratory pressure generated.
2. the higher the expiratory flow the greater the expiratory pressure generated.
3. 10-20 cm H20
how do u find out the I:E ratio an insp. flow demand?
(you are provided with the RR, Vt, and IT(insp time)
1. 60 sec divided by the RR
2. then subtract the IT from that number. that will give you the ET
3. then add insp and exp ratio together
4. mutiply that # with the RR and multiply that by the Vt. convert answer into liters
5. that will give you the insp flow demand.