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Airway Mechanics

Deleted user 10 questions Updated 11 Jan 2017

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Questions in this quiz (10)

  1. 1Formula for Raw
    ([blank_start]Mouth[blank_end] Pressure - [blank_start]Alveolar[blank_end] Pressure) / [blank_start]Flow[blank_end]
    1. AMouth
    2. BAlveolar
    3. CFlow
  2. 2Airway resistance:
    Difference in pressure between the [blank_start]mouth[blank_end] and the [blank_start]alveoli[blank_end], related to gas [blank_start]flow[blank_end] at the mouth.
    Typical value [blank_start].6[blank_end] - [blank_start]2.4[blank_end] cmH2O / L/sec
    Measured by body pleth: Pt pants gently with open shutter at a rate of [blank_start]1.5[blank_end] - [blank_start]2.5[blank_end] 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.
    1. Amouth
    2. Balveoli
    3. Cflow
    4. D.6
    5. E2.4
    6. F1.5
    7. G2.5
  3. 3Normal Raw Values
    Nose, mouth, upper airway: [blank_start]50[blank_end]%
    Trachea, Bronchi: [blank_start]30[blank_end]%
    Small Airways: [blank_start]20[blank_end]%
    1. A50
    2. B30
    3. C20
  4. 4Airway Conductance ([blank_start]Gaw[blank_end])
    Flow per unit of [blank_start]pressure[blank_end] change in L/sec/cmH2O
    Reciprical of Raw: 1/[blank_start]Raw[blank_end]
    [blank_start]Specific[blank_end] conductance is the same but is measured by liter of [blank_start]lung[blank_end] volume: (1/Raw)/[blank_start]TLC[blank_end] or [blank_start]FRC[blank_end]
    Normal Value: .[blank_start]42[blank_end] - [blank_start]1.67[blank_end] L/sec/cmH20
    More appropriate than Raw for small airway disease
    1. AGaw
    2. Bpressure
    3. CRaw
    4. DSpecific
    5. Elung
    6. FTLC
    7. GFRC
    8. H42
    9. I1.67
  5. 5Compliance
    Volume Change per unit of Pressure change
    CLT = Lungs and [blank_start]Thorax[blank_end] = [blank_start].2[blank_end] L/cmH2O
    CL = [blank_start]Lungs[blank_end] Only = [blank_start].2[blank_end] L/cmH2O
    CT = [blank_start]Thorax[blank_end] only = [blank_start].1[blank_end] L/cmH2O

    In vented patients record plateau pressure at different lung volumes.
    1. A.2
    2. B.2
    3. CThorax
    4. DLungs
    5. E.1
    6. FThorax
  6. 6Compliance:
    [blank_start]Esophogeal[blank_end] Balloon Technique
    Catheter with inflatable [blank_start]balloon[blank_end] is marked [blank_start]50[blank_end] cm from the tip.
    Balloon is inserted through the nose and swallowed into [blank_start]stomach[blank_end].
    In the stomach pressure swings [blank_start]positive[blank_end] on inspiration and [blank_start]negative[blank_end] on expiration after 1 ml of air is injected.
    Balloon is retracted into [blank_start]esophagus[blank_end] and the pressure swings [blank_start]reverse[blank_end].
    Catheter is [blank_start]35[blank_end] - [blank_start]45[blank_end] cm from the nose.
    Air is evacuated from the balloon, then [blank_start].5[blank_end] ml is injected.
    Pt inspires to [blank_start]TLC[blank_end] 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 [blank_start]curve[blank_end] over segment from FRC to [blank_start]FRC[blank_end] +.5L
    At FRC balloon pressure should equal [blank_start]-5[blank_end] cmhO
    Max elastic [blank_start]recoil[blank_end] pressure is the most [blank_start]negative[blank_end] pressure at TLC
    Static lung compliance is the difference of [blank_start]esophageal[blank_end] pressure and mouth [blank_start]pressure[blank_end].
    1. AEsophogeal
    2. Bballoon
    3. C50
    4. Dstomach
    5. Epositive
    6. Fnegative
    7. Gesophagus
    8. Hreverse
    9. I35
    10. J45
    11. K.5
    12. LTLC
    13. MFRC
    14. Ncurve
    15. O-5
    16. Precoil
    17. Qnegative
    18. Rpressure
    19. Sesophageal
  7. 7Static Lung Compliance
    Change in lung [blank_start]volume[blank_end] per unit change in transpulmonary [blank_start]pressure[blank_end] measured over the straight portion of P-V curve between FRC and FRC + [blank_start].5L[blank_end]
    Δ[blank_start]V[blank_end] / Δ[blank_start]Pst[blank_end]

    Normal Value = [blank_start].2[blank_end] L/cmH2O
    1. Avolume
    2. Bpressure
    3. C.5L
    4. DPst
    5. EV
    6. F.2
  8. 8Abnormal Compliance
    CL is [blank_start]decreased[blank_end] in [blank_start]restrictive[blank_end] disease like pneumonia, atelectasis, pulm fibrosis
    CL is [blank_start]increased[blank_end] in emphysema because of loss of [blank_start]elasticity[blank_end]
    CT is [blank_start]decreased[blank_end] with chest wall deformities and obesity.
    1. Arestrictive
    2. Belasticity
    3. Cdecreased
    4. Dincreased
    5. Edecreased
  9. 9Maximum Static Recoil Pressure
    Most [blank_start]negative[blank_end] pressure obtained at TLC
    Normal value is [blank_start]24.4[blank_end] - [blank_start]34.5[blank_end] cmH2O
    1. Anegative
    2. B24.4
    3. C34.5
  10. 10CoEffecient of Retraction
    COR is used to express the maximal static recoil [blank_start]pressure[blank_end] of the lung relative to the lung [blank_start]volume[blank_end] (TLC)
    COR = (Pst at [blank_start]TLC[blank_end]) / [blank_start]TLC[blank_end]
    Normal Value = [blank_start]4[blank_end]-[blank_start]8[blank_end] cmH2O/L
    1. Apressure
    2. Bvolume
    3. CTLC
    4. DTLC
    5. E4
    6. F8

Information

Description
User has deleted their subject information Quiz on Airway Mechanics, created by Deleted user on 19/08/2016.
Author
Deleted user
Language
English
Views
46
History
Created on 19 Aug 2016 · updated on 11 Jan 2017

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