Table 1.

Comparison of effective concentrations of anesthetics for inhibition of spine dynamics and anesthesia

Volatile	Effective concentration for spine motility, mM*	Effective concentration for anesthesia, mM†
Chloroform	1.33	1.30§
Diethylether	20.4	25.0§
Enflurane	0.30	0.64‡
Halothane	0.23	0.27‡
Isoflurane	0.30	0.31‡

^*Calculated from concentration of saturated solution at 25°C used as stock solution. 

^†On the basis of values for minimal alveolar concentration in rats ( 

^‡) or EC₅₀ in tadpoles ( 

^§) (5, 14).