Equations for CRT

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Author:
darrell2662
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186403
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Equations for CRT
Updated:
2012-12-01 15:10:36
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Equations
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  1. Static Compliance
  2. Alveolar minute ventilation


    Estimated 1ml per lb of ideal body weight for VD
  3. Cardiac Output



    Heart rate X stroke volume
  4. Mean arteriol pressure


    • Mean: 90
    • Monitors perfusion
    • Normal:120/80
  5. Cerebral Perfusion Pressure
    CPP=MAP-ICP

    Normal: 70-90
  6. Smoking History
    Pack years= # of packs/day x # of years smoked

    4 packs a day x 10 years equals 40 pack years
  7. ETT size
    Size= weight in kg divided by 10

    Oral: 21-25 cm mark at lip

    Nasal: 26-29 cm mark
  8. Catheter size


    8.0/2 =4x3 =12 french
  9. Alveolar air equation
    (FiO2 x 7) - (PaCO2 + 10)

    • 50%= 300 torr
    • 100% O2= 600 torr
  10. The A-a Gradient
    (A-aDO2)
    A-aDO2 = PAO2 - PaO2
  11. Arterial oxygen content
    (CaO2)
    CaO2 = (Hb x 1.34 x SaO2) + (PaO2 x .003)

    Normal: 17-20%

    Good PaO2, good Hb, Good SaO2 then answer is gonna be in high teens

    Bad PaO2, Bad Hb, Bad SaO2 then answer is gonna be in low teens
  12. Mixed venous oxygen content
    (CVO2)
    Bad arteriol

    CVO2 = (Hb x 1.34 x SVO2) + (PVO2 x .003)

    Normal: 14%
  13. Arteriol- Venous oxygen content difference
    C(a-V)O2
    C(a-v)O2 = CaO2-CvO2

    Normal:4-5%
  14. Shunt equation
    (Qs/Qt)
    Calculate the percent shunt when the A-aDO2 is 300 torr and the C(a-v)O2 is 3.6 vol %!

    For every 100 on the A-a gradient, add another 5% shunt to normal

    Answer is 20%
  15. Deadspace to tidal volume ratio
    (VD/VT)
  16. Duration of Flow
  17. Air to oxygen Ratio
  18. Total flow
    Total flow=(flow meter setting x factor)

    What is the total flow when a venti mask is set at 5 L/min and the dilution control is set at 28%?

    • Air/O2 entrainment ratio is 10:1 for 28%
    • Total flow factor is 11

    5 x 11 = 55 L/min
  19. Raw
    (Peak pressure- Plateau pressure)/ flow L/sec

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