Anesthesia Pharmacology:  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 OnLine)

Dependent
Variable

Units

Ideal Gas

van der
Waals Gas

Dieterici
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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