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Calculations

Deleted user 11 questions Updated 25 Aug 2016

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Questions in this quiz (11)

  1. 1Alveolar Air Equation: Calculates partial pressure of O2 in Alveoli

    PAO2 = (([blank_start]Pb[blank_end] - 47)[blank_start]FiO2[blank_end]) - (PaCO2/[blank_start].8[blank_end])

    Shortcut: PAO2 = (7 x FiO2) - (PaCO2 +10)
    1. APb
    2. B.8
    3. CFiO2
  2. 2A-a Gradient: Measures difference between aveolar and arterial O2

    A-aDO2 = PAO2 - PaO2

    25-65 on 100% O2 is [blank_start]Normal[blank_end]
    66 - 300 is [blank_start]V/Q[blank_end] mismatch
    >300 = [blank_start]Shunting[blank_end]
    1. AShunting
    2. BV/Q
    3. CNormal
  3. 3Arterial O2 Content (CaO2) Best measurement of O2 delivered to tissues

    CaO2 = ([blank_start]Hb[blank_end] x [blank_start]1.34[blank_end] x SaO2) + (PaO2 x [blank_start].003[blank_end])
    O2 in red blood cells plus O2 in plasma

    Normal value is [blank_start]17[blank_end]-[blank_start]20[blank_end] vol% (mL/dL)
    1. AHb
    2. B1.34
    3. C.003
    4. D17
    5. E20
  4. 4Mixed Venous O2 Content (CvO2) Total O2 in venous blood

    CvO2 = (Hb x [blank_start]1.34[blank_end] x [blank_start]SvO2[blank_end]) + [blank_start]PvO2[blank_end] x .003)

    Normal [blank_start]12[blank_end] - [blank_start]16[blank_end] vol%
    CvO2 will [blank_start]decrease[blank_end] when cardiac output decreases
    SvO2 will decrease also.
    1. A1.34
    2. BSvO2
    3. CPvO2
    4. D12
    5. E16
    6. Fdecrease
  5. 5Arterial - Venous O2 Content Difference Ca-vO2 - Provides estimate of Tissue O2 consumption
    Ca-vO2 = CaO2 - CvO2

    Normal is [blank_start]4[blank_end] - [blank_start]5[blank_end] vol %

    Used in Fick equation to calculate [blank_start]Cardiac[blank_end] Output


    1. A4
    2. B5
    3. CCardiac
  6. 6Cardiac Output Qt
    Modified [blank_start]Fick[blank_end]
    Used to calculate Cardiac output when O2 consumption and O2 content differences are known
    Qt = ([blank_start]VO2[blank_end] / (Ca-vO2([blank_start]10[blank_end]))
    Normal value is 4-8 L/min
    VO2 = Qt x Ca-vO2 x 10
    1. A10
    2. BVO2
    3. CFick
  7. 7Shunt Equation
    Qs / Qt

    Portion of cardiac output that is shunted and does not participate in gas exchange

    Qs/Qt = ((A-aDO2) x .003) / (A-aDO2) x .003) + Ca-vO2

    Normal is [blank_start]3[blank_end]-[blank_start]5[blank_end] %
    Can be estimated: Assuming 5% shunt increase for each 100 torr of A-aDO2
    1. A3
    2. B5
  8. 8SaO2 Arterial O2 Saturation
    % of Hb that is bound by O2 calculated by ABG analyzer
    Measured by hemoximeter or co-ox

    Large differences in calculated and measured could be because of increased carboxyhemoglobin levels

    PaO2 is estimated by subtracting [blank_start]30[blank_end] from [blank_start]PaO2[blank_end]
    1. APaO2
    2. B30
  9. 9HB / Hct
    HB is normally [blank_start]12[blank_end] - [blank_start]16[blank_end] g/dl
    HCT is usually [blank_start]3[blank_end] times HB in percent
    1. A3
    2. B12
    3. C16
  10. 10Deadspace to Vt Ratio
    VD/Vt
    % of gas that doesn't participate in gas exchange
    Normal is [blank_start]20[blank_end]-[blank_start]40[blank_end]%

    ((PaCO2 - PeCo2) / [blank_start]PaCO2[blank_end]) x 100

    Increased VD/VT indicates deadspace disease like a [blank_start]PE[blank_end]
    1. APE
    2. B20
    3. C40
    4. DPaCO2

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Description
User has deleted their subject information Quiz on Calculations, created by Deleted user on 19/08/2016.
Author
Deleted user
Language
English
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35
History
Created on 19 Aug 2016 · updated on 25 Aug 2016

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