Anesthesia Pharmacology Chapter 4:  Physics and Anesthesiology

Vaporizers

 

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Vaporizers

 

photo: Richard Struthers, The Anesthesia Machine

Fig. 1: Variable Bypass Vaporizer

 

Fig 2: Measured Flow Vaporizer (e.g. Copper Kettle  (Foregger, Puritan-Bennett), Verni-Trol (Ohmeda))

 

 

Table 1:  30Saturated Vapor Pressures (SVP) 20oC

halothane (Fluothane)

243 mm Hg

(volume % at 1 atm) 

32% (243/760)

isoflurane (Forane)

238 mm Hg

31%

enflurane (Ethrane)

172 mm Hg

23%

sevoflurane (Sevorane, Ultane)

160 mm Hg

21%

Gaseous Equation of State Calculator (courtesy of Dr. Fred Senese, General Chemistry

Dependent
Variable
UnitsIdeal Gasvan der
Waals Gas
Dielectric
Gas
Pressure
Volume
Temperature
Moles mol

Gas van der Waals
Parameters
Dieterici
Parameters
PC (atm) a (SI units)
VC (L/mol) b (SI units)
TC (K) TBoyle/TC
ZC (K) ZC (calc)
 
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Citations