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47 Cards in this Set

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Saturated Vapor Pressure
At equilibrium the partial pressure exerted by the vapor
Gas in Solution
-At equilibrium the liquid is saturated with gas.
Henry's Law
Double Pressue
Double Solubility
Temp = Constant
Henry's Law
amount of gas abs. by a liquid is directly proptional to part press of gas in eqilibrium with the liquid
Henry's Law
Amount of anesthetic vapor absorbed into the blood is directly proptional to part press of the anesthetic in the alveoli
If temperature is not held constant and a gas is heated
Gas comes out of solution
(pop can in the sun)
Bunsen Solubility Coefficient
Nitrogen at const temp @ 760
= ___ml N2/1L H20
14 ml
Bunsen Solubility Coefficient
Nitrous Oxide at const temp @ 760 = ___ml N2/1L H20
39 ml (Nitrous is more soluble than Nitrogen)
pertains to the solubility of gas in liqid using STP
Bunsen Solubility Coefficient
Oswald Solubility Coefficient
Nitrous Oxide at37 temp @ ambient pressue
= ___ml N2/1L H20
39 ml N20/1000ml in Blood
Oswald Solubility Coefficient
Nitrous Oxide at 37 temp @ ambient press = ___ml N2/1L Blood
470 ml in Blood (Nitrous more soluble in the blood than H20)
The solubility of a Gas
Depends upon
-Partial Pressue
- Temperature
- Gas & Liquid Concerned
Ostwald Solubility Coefficient (used in ans)
volume of gas which dissolves in one unit volume of liquid at the temperature concerned
Ostwald Solubility Coefficient (used in ans)
volume of gas is not corrected to STP, measured at ambient temp/pressure
Double pressure @ constant temp and volume reamins the same.
Boyles Law
Partition Coefficient
ratio of a subst in one phase compared to another
- two phases being = vol. and in equilibrium
Partition Coefficient
Specify the phases of concern in correct order
- temp should be specified
Blood Gas Partition Coeffcient
at equilibrium concentration in blood = 47ml, the ratio of that to the unit volume
47/100 = .47
Blood Gas Partition Coeffcient
N2O in Blood = total of 1L, 37 C, 470ml N20/1L =
47 per 100ml = .47
Blood/Oil Partition Coefficient
Oil + Bld = 1L
1.4 L N20 in Oil
470ml N20 in Bld
= .47/1.4 = 0.33
At equal pressure & 37C what is the Solubility Coefficient of N20
= .47L
At equal pressure & 37C what is the Solubility Coefficient of Halothane
= 2.3 L
At equal pressure & 37C what is the Solubility Coefficient of Ether
= 12 L
The _____ soluble the longer it will take to build tension in the alveoli
more
With gas the blood must be saturated prior to building ______in the alveoli
tension
With gas the blood must be saturated prior to building tension in the alveoli prior to building tension in the ___
brain
Where do we want to keep anesthetic gas
Alveoli
Keeping the Alveoli tension high.
FA =
Fraction Alveolar
Fi =
Fraction inspired
Solubility in blood:
Des
.42
Solubility in blood:
Sevo
.68
Solubility in blood:
Halothane
2.4
Solubility in blood:
Forane
1.4
What is considered low solubility
< 1
What is considered high solubility
4-5
Low blood solubility example
N20
Medium blood solubility example
Halothane
High blood solubility example
Ether
The wake up curve for low solubility =
low solubility = short wake up time
(fast to sleep, fast to wake up)
The wake up curve for high solubility =
Long time to go to sleep, long time to wake up.
Higher solubility takes away from alveolar tension and takes _____ to take effect
longer, absorb in blood readily. (low solubility works faster)
Oil gas partition(37C)
N20
=1.4 (more soluble in oil than bld)
Oil gas partition(37C)
Ether
= 65 less soluble than halothane (opposite in blood)
Oil gas partition(37C)
Halothane
= 224
Minimum Alveolar Conc (MAC)
%vol at 1 ATM
= a dose, indicates potentcy
Solubility coefficient in oil is an indication of
the potentcy
Increased oil solubility =
increased potentcy