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Equipment Theory for Respiratory Care Chapter 6 questions with answers.
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Equipment Theory for Respiratory Care Chapter 6 questions with answers.
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Equipment Theory for Respiratory CareChapter 6 questions with answers.
Pulmonary measurement devices ANS - 1. Measures lung volumes and flow rates.
2. Principles used in this measurement are volume displacement, body plethysmography, and flow
measurement.
Volume displacement devices ANS - 1. Relies on patients exhaled volume or gas to expand a bellows
and move a bell or piston
2. The amount of movement is proportional to the volume exhaled.
Water seal spirometers ANS - a volume displacement device that measures lung volume
Kymograph ANS - 1. Moving pen recorder
2. Measures flow and volume
Dry rolling seal spirometer ANS - Operates like a frictionless piston
Bellows spirometer ANS - Gas enters the bellows causing it to expand. The expansion is proportional to
change in volume.
Body plethysmograph ANS - 1. Relies on Boyle's law to measure thoracic volume changes.
2. Completely encloses the patient in an airtight sealed chamber.
3. As the patient's lungs expand and contract, the volume they occupy in the Vic increases and
decreases.
pneumotachometer ANS - 1. Devices that measure gas flow.
2. Volume is obtained by the following: Volume=(Flow)(Time)
, Thermal anemometer ANS - 1. Uses a heated element at a constant temperature. As gas passes the
element it is cooled by convection.
2. When the temp of the element drops, additional current is called for by the thermostat to maintain
constant temp. Current flow is proportional to gas flow.
Fleisch pneumotachometer ANS - 1. Relies on a pressure difference to measure flow
2. Heated capillary tubes cause resistance to gas flow. Gas flowing through the device will create a
pressure difference before and after the resistance grid.
Venturi pneumotachometer ANS - 1. Incorporates a venturi tube and a differential pressure
transducer .
2. By placing pressure taps distal to the throat of a venturi it is possible to measure flow.
3. Difference in pressure between the proximal pressure port and the port at the venturi port is
proportional to the flow of gas through the tube.
4. Differential pressure transducer converts the pressure difference to an electrical signal. The voltage
difference then becomes directly proportional to flow.
Pilot tube flow sensor ANS - 1. Another pneumotachometer that measures flow based on pressure
differences.
2. Pressure difference between the ram air pressure and static pressure is proportional to flow.
Wright respirometer ANS - 1. Portable respirometer that uses rotating vanes and a gear mechanism to
measure exhaled volumes.
2. A rotating vane turns a gear mechanism, causing a dial to move and indicates a change in volume.
Holoscale respirometer ANS - Larger wright respirometer
Peak flowmeter ANS - 1. A type pf pneumotachometer that is used at the bedside to measure peak
expiratory flow rates.
2. Useful in determining the effectiveness of a bronchodilator and the reversibility of an airway
obstruction.
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