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Thread: Fluids q2 N*

  1. #1
    Roxanita is offline Senior Member
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    Fluids q2 N*

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    A 23 y.o. med student weighing 70Kg participates in a clinical study. Which of the following volumes (in liters) are most likely measured under basal conditions?
    (PV=plasma volume; ISFV=interstitial fluid volume; ICFV=intracellular fluid volume; ECFV=extracellular fluid volume; TBW=total body water)

    PV/ISFV/ICFV/ECFV/TBW

    a)3-11-28-14-42

    b)3-12-24-14-38

    c) 3-12-30-15-47

    d) 4-10-28-14-41

    e) 4-12-26-15-40

  2. #2
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    Asclepius1 is offline Ultimate Member 537 points
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    My guess is A.

    2/3 of total body weight is total body fluid

    2/3 of total body fluid is Intracellular

    1/3 of total body fluid is extracellular

  3. #3
    Roxanita is offline Senior Member
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    TBW= aprox 60% Weight (Kg)

    TBW = ICF (2/3TBW) + ECF(1/3TBW)

    ECF = ISF(2/3ECF) + PV(1/3 ECF)


    Therefore... 60%(70)= 42lts

    ICF=2/3(42)=> ICF= 28 --> ECF=14

    ISF= 2/3(14)=> ISF=10 --> PV=4

    answer a)

    Relationship between the volumes of major fluid compartments
    The values shown are calculated for a 70 kg man: TBW = 0.6 x Body weight


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