# Pharm

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1. Ficks law of diffusion
• diffusion= (P1-P2)(Area)(solubility)
•                ----------------------------
•              (membrane thickness)(sq.root of MW)
2. Graham's law of diffusion
rate of diffusion = 1/sq root of density = 1/sq root of molar mass3.
3. Henry's Law
amt of gas that will dissolve in a liquid is proportional to the partial press of the gas in the gas phase

- allows determination of amts of gases (O2 and CO2) that will dissolve in blood
4. Amt of O2 tha dissolves in blood
0.003 ml/100 ml blood/mmHg partial press

-so, if PaO2 is 300 mmHg, then 300 mmHg x 0.003= 0.9 ml O2/100 ml blood
5. laminar flow
change in P/airway resistance

• airway resistance = 8 x length x viscosity
•                             ------------------------
•                          pi x radius to the 4th power
6. Reynolds number
• Re =linear velocity x diameter x fluid density
•        --------------------------------------------
•                        viscosity

• low reynolds # (<1000) = laminar flow
• high reynolds # (>1500) = turbulent flow
7. poiseuille's law
-used for laminar flow

F = (pi r4 change P)/(8 viscosity length)
8. Bernoulli's Principle
• - r/t laminar flow
• - based on total conservation of energy

E = PV + mgh + 1/2 mv2

in a narrowing, assuming constant flow, resistance & press will decrease in the narrowing

• R = change in P/ F
• R = 8(viscosity)(lenght)/(pi r4)
9. causes of turbulent flow
• - rough tubing walls or kinks
• - flow through orifice
• - high velocity flow

flow exiting the narrowing becomes turbulent

turbulent flow is inversely related to density
10. absolute humidity
mass of water vapr in a given volume of air
11. relative humidity %
(actual vapor press/saturated vapor press) x 100
12. ohm's law
energy = current (amperes) x resistance (ohms)

E = IR
13. % inspired air
• % of inhaled air that is occupied by anesthetic has
• -controlled by anesthetic machine
14. alveolar partial press
used as a determinant of brain partial press
 Author: shirljoa ID: 214727 Card Set: Pharm Updated: 2013-04-21 03:37:54 Tags: Inhalationals Folders: Description: Inhalationals Show Answers: