Physio Equations

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Author:
sketch112
ID:
140863
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Physio Equations
Updated:
2012-03-11 10:15:46
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  1. Cardiac Output
    CO= HR x SV
  2. Darcy's Law of Bulk Flow
    BF= P/R
  3. Resistance
    1/r^4
  4. Velocity of BF
    Flow (CO)/ cross-sectional area
  5. Stroke Work
    SW= SV x MAP
  6. Mean Arterial Pressure
    MAP= CO x TPR
  7. Pouiselle's Law
    BF= P (viscosity/n4)
  8. Resistance (w/i organs)
    Series

    R1+ R2 + R3
  9. Resistance (b/w organs)
    Parallel

    1/R1+ 1/R2+ ....
  10. Heart Rate (EKG)
    60/# beats
  11. Compliance
    C= V/P
  12. Mean Arterial Pressure
    MAP= diastolic + 1/3 (pulse presure)
  13. Pulse Pressure
    PP= Systoli- diastolic (~40)
  14. Reynold's
    VDp/n

    velocity x diameter x density / viscosity
  15. Laplace's Law
    P= 2T/r
  16. Net Filtration
    Jv= k[Pc-Pif]-[pic-pif]
  17. Ejection Fraction
    EF= SV/EDV
  18. Fick's Principle
    CO= O2 consumption/ (O2 pulm vein - O2 pulm art)

    • Pulm vein= peripheral artery (ex: brachial)
    • Pulm artery= systemic mixed venous blood
  19. Stroke Volume
    SV= EDV-ESV
  20. Filtered load
    GFR x P
  21. Excretion Rate
    UV
  22. Reabsorption
    (GFR x P) - (UV)
  23. Secretion
    (UV)-(GFR x P)
  24. Renal Plasma Flow
    RPF=(Upah x Vpah)/(Ppah)
  25. GFR
    PUF x Kf

    PUF= (PGc-Pbs)-piGc
  26. Clearance
    C=UV/P

    (inulin, or ~creatinine)
  27. Fractional Excretion
    FE= C / GFR x 100
  28. Fractional Reabsorption
    100- FE
  29. Free H2O Clearance
    CH2O=VCosm
  30. Net Flux
    Jx= PA( Xo-Xi)

    + = movement into cell
  31. Daltons Law
    760 (%) + 760 (%)...
  32. Nernst
    -60log(xi/xo) = cations

    • Na+ = 59
    • Cl= -46
    • K= -83
  33. Driving Force
    DF= Vm- Em

    + = driven out of cell

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