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### 7 Cards in this Set

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 Body fluid compartment measurement with dye-dilution [A1] (mg/ml) x Vol1 (ml) = amount of A (mg) = [A2] x Vol2 A1 = known concentration of substance Vol1= known volume of substance A2 = concentration of distributed subtance in body compartment Vol 2 is volume of body compartment He dilution - FRC = V1(C1-C2)/C2 - C1 = initial [He] - C2 = final [He] - V1 initial volume of system plethysmography - boyle's law to find FRC - airtight box of known V - P measured in box and at airway during inspiration effort at closed airway - V1 = volume in box - V2 = volume after inspiration - change in volume = volume of thorax - P3 and p4 are pressure in airway before and after inspiration P3v3 = p4(V3+ change in V) - V3 = FRC FRC = P4 (change in V/ change in P) Folwer method - measures deadspace - 100% O2 in, V and [N] measured on exhalation - no increase in N initially, but incrases to an S curve gradually before a plateau - horizontal line from plateau, vertical tangent to it, through S curve - alveolar gas = plateau - value at which perpendicular intersects Volume axis is anatomic dead space Bohr Method - physiological and anatomical dead space - yield same as Fowlers - when high physiologic deadspace bohr --> large value - Vd/Vt = - (PaCO2 - PECO2)/ PaCO2 PaCO2 = partial pressure of CO2 in arterial blood PECO2 = partial pressure of CO2 in expired air - normal is .2 - .4 Flow rate V = ΔP/R P = driving force R = resistance V= flowrate (with a dot over it) Poiseuille's Law R = 8nl/pi r^4 flowrate and pressure under laminar flow - R = resistance - n = viscosity of gas - l = length of tube -