Quiz
Volume and Flow Measuring Devices
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Perguntas do quiz (6)
1Volume Measuring Spirometers
Wedge Bellows
Collapsable bellows that folds and unfolds as patient [blank_start]breathes[blank_end]
Will [blank_start]lose[blank_end] volume if cracks or holes in bellows
Dry Rolling Seal Spirometer
Volume Displacement
Consists of a [blank_start]piston[blank_end] within a [blank_start]cylinder[blank_end] supported by a rod resting on a frictionless bearings
Rod can be attached directly to a potentiometer or recording pen on paper
Can be used to assess pre/post bronchodilator changes
Water Seal Spirometer
Volume Displacement
AKA Collins or [blank_start]Steadwell[blank_end]
Large bell [blank_start]7[blank_end]-[blank_start]14[blank_end] L, submerged in a column of [blank_start]H2O[blank_end]
As pt breathes, bell moves an equally [blank_start]proportional[blank_end] distance
Recorded with chain/pulley device connected to kymograph
For rebreathing studies: [blank_start]separate[blank_end] hoses and [blank_start]CO2[blank_end] scrubber are needed
Calibration: Using 3L syringer, must be accurate - range +- [blank_start]3.5[blank_end]%
Leak Test: Filling spirometer to 1/2 volume then applying a [blank_start]weight[blank_end]
Flow Cal: using [blank_start]rotameter[blank_end] 2-12 L/sec- Abreathes
- Blose
- Cpiston
- Dcylinder
- ESteadwell
- F7
- G14
- HH2O
- Iproportional
- Jseparate
- KCO2
- L3.5
- Mweight
- Nrotameter
2Flow measuring Devices
Peak flow meter
Measure peak expiratory flow at [blank_start]bedside[blank_end]
Pt inhales maximally then exhales hard and fast through deice
PEFR is read directly from [blank_start]scale[blank_end]
Factors that affect accuracy - Pt effort, [blank_start]Moisture[blank_end], Debris
Turbine Device
Wright Respirometer
Rotating [blank_start]Vane[blank_end] with gears, flow causes vanes to [blank_start]spin[blank_end] and displays volume
Accurate from 3-200 lpm
Assure [blank_start]linearity[blank_end] by checking flows with 3L syringe
Can become alinear from vane [blank_start]deformation[blank_end], contamination or debris- Abedside
- Bscale
- CMoisture
- DVane
- Espin
- Flinearity
- Gdeformation
3Pneumotach - measures flow and converts to volume display
Ultrasonic Pneumotach
AKA [blank_start]Vortex[blank_end] Shedding or Transit Time
Consists of an emitting and recieving [blank_start]crystal[blank_end] and a lflow tube with struts
Number of [blank_start]pulses[blank_end] is proportional to [blank_start]flow[blank_end]
Pitot Tube
Flow measured by placing a series of small [blank_start]tubes[blank_end] in a flow sensor and connecting to a pressure transducer
Condensation and secretions [blank_start]do not[blank_end] affect measurements
Thermal Element
Contains heated [blank_start]platinum[blank_end] wire or small metal [blank_start]bead[blank_end] that [blank_start]cools[blank_end] as gas flows across. Amount of current needed to maintain tem is [blank_start]proportional[blank_end] to flow
Accuracy is affected by gas [blank_start]composition[blank_end]
Pressure Differential
AKA Fleisch Pneumotach
Contains [blank_start]resistive[blank_end] element that causes pressure to drop as gas flows across. Difference in pressure is [blank_start]proportional[blank_end] to flow
Commonly used in Body Box
Heat is incorporated to reduce [blank_start]condensation[blank_end]- AVortex
- Bcrystal
- Cpulses
- Dflow
- Etubes
- Fdo not
- Gplatinum
- Hbead
- Icools
- Jproportional
- Kcomposition
- Lresistive
- Mproportional
- Ncondensation
4CO2/Water Absorbers
CO2 Absorbers
Sodium [blank_start]Hydroxide[blank_end], NaOH (SodaLime, Soda-Sorb) BaraLyme, Barium Hydroxide
Used for [blank_start]rebreathing[blank_end] tests, [blank_start]He[blank_end] Dilution or DLCO RB
Replace: When exhausted, when color [blank_start]changes[blank_end], Weekly
Produced H20 as a byproduct. Place upstream from H20 [blank_start]absorber[blank_end]
Water Absorber
Drie-Rite (calcium sulfate, CaSO4)
Removes moisture from pt breathes through circuit
When CO2 reacts with soda lime it produces H20
Place [blank_start]AFTER[blank_end] co2 absorber and before analyzer- AHydroxide
- Brebreathing
- CHe
- Dchanges
- Eabsorber
- FAFTER
5Permapure Tubing ([blank_start]Fafion[blank_end])
Special tubing - conditions gas to equilibrate with [blank_start]ambient[blank_end] humidity
Allows for accurate levels in gas samples
Valves
Directional Valves
Allows tech to switch pt into [blank_start]circuit[blank_end]
[blank_start]Directs[blank_end] exhaled gas through analyzers.spirometers- AFafion
- Bambient
- Ccircuit
- DDirects
6Calibration
3L syringe to check for [blank_start]leaks[blank_end]
Volume should be checked at low, med and high [blank_start]flows[blank_end] to assure linerity
Rotameter is a good device for [blank_start]reproducible[blank_end] low flows
Sine-Wave [blank_start]pump[blank_end]: Biphasic, simulates flows and volumes
Automatic Syringe - [blank_start]Computer[blank_end] Controlled motor syringe
Explosive [blank_start]decompression[blank_end] device - simulates FVC
Alinearity can happen: Contamination, bent vanes, moisture, debris
Once volume displacement spirometer is caled it will retain linearity until it develops a [blank_start]leak[blank_end]- Aleaks
- Bflows
- Creproducible
- Dpump
- EComputer
- Fdecompression
- Gleak
Informações
- Descrição
- O usuário eliminou as informações de disciplina Quiz sobre Volume and Flow Measuring Devices, criado por Usuário eliminado em 19-08-2016.
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- Usuário eliminado
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- Criado em 19 ago 2016 · atualizado em 25 ago 2016
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