LeeAnna Shepherd
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(Airway Resistance (Raw)) Lung Testing Test sobre Airway Mechanics, creado por LeeAnna Shepherd el 13/08/2016.

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LeeAnna Shepherd
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Airway Mechanics

Airway Mechanics

Pregunta 1 de 10

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Formula for Raw
( Pressure - Pressure) /

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Pregunta 2 de 10

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Airway resistance:
Difference in pressure between the and the , related to gas at the mouth.
Typical value - cmH2O / L/sec
Measured by body pleth: Pt pants gently with open shutter at a rate of - breaths per second. This creates an 2 shaped curve on screen that plots flow against box pressure. Shutter closes and second curve is produced that plots mouth pressure against box pressure. Raw is calculated from these 2 graphs.

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Pregunta 3 de 10

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Normal Raw Values
Nose, mouth, upper airway: %
Trachea, Bronchi: %
Small Airways: %

Explicación

Pregunta 4 de 10

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Airway Conductance ()
Flow per unit of change in L/sec/cmH2O
Reciprical of Raw: 1/
conductance is the same but is measured by liter of volume: (1/Raw)/ or
Normal Value: . - L/sec/cmH20
More appropriate than Raw for small airway disease

Explicación

Pregunta 5 de 10

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Compliance
Volume Change per unit of Pressure change
CLT = Lungs and = L/cmH2O
CL = Only = L/cmH2O
CT = only = L/cmH2O

In vented patients record plateau pressure at different lung volumes.

Explicación

Pregunta 6 de 10

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Compliance:
Balloon Technique
Catheter with inflatable is marked cm from the tip.
Balloon is inserted through the nose and swallowed into .
In the stomach pressure swings on inspiration and on expiration after 1 ml of air is injected.
Balloon is retracted into and the pressure swings .
Catheter is - cm from the nose.
Air is evacuated from the balloon, then ml is injected.
Pt inspires to before taking any measurements to standardize.
Have pt inspire again - pressure and volume measurements are taking at zero flow.
Lung compliance is taken from slope of P-V over segment from FRC to +.5L
At FRC balloon pressure should equal cmhO
Max elastic pressure is the most pressure at TLC
Static lung compliance is the difference of pressure and mouth .

Explicación

Pregunta 7 de 10

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Static Lung Compliance
Change in lung per unit change in transpulmonary measured over the straight portion of P-V curve between FRC and FRC +
Δ / Δ

Normal Value = L/cmH2O

Explicación

Pregunta 8 de 10

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Abnormal Compliance
CL is in disease like pneumonia, atelectasis, pulm fibrosis
CL is in emphysema because of loss of
CT is with chest wall deformities and obesity.

Explicación

Pregunta 9 de 10

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Maximum Static Recoil Pressure
Most pressure obtained at TLC
Normal value is - cmH2O

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Pregunta 10 de 10

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CoEffecient of Retraction
COR is used to express the maximal static recoil of the lung relative to the lung (TLC)
COR = (Pst at ) /
Normal Value = - cmH2O/L

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