ИЗМЕНЕНИЯ ВНУТРИКЛЕТОЧНЫХ ПОТЕНЦИАЛОВ И ИОННЫХ ТОКОВ НЕЙРОНОВ МОЛЛЮСКОВ ПРИ ВНЕ- И ВНУТРИКЛЕТОЧНОМ ДЕЙСТВИИ СЕВОФЛУРАНА И ДЕСФЛУРАНА

Intercellular potentials changes of identifiable intact neurons ini solated CNS of great ramshorn ( Planorbarius corneus ) have been investigated with the help of intercellular microelectrodes and ion currents of isolated neurons of great ramshorns and pond snails ( Lymnaea stagnalis ) with the fixation of potential influenced by desflurane in concentrations of 1 and 10 mM (1.2 и 12 MAC) and sevoflurane in concentrations of 1 and 5 mM (2.27 and 11.36 MAC). In 3-5 minutes after the start of anesthetics' action some neurons developed insignificant hyperpolarization (for 2-5 mV), and some other developed depolarization (up to 10 mV). When anesthetics were being washed out for 5-10 minutes the reversible depolarization appeared.  Changes in ion currents under the influence of anesthetics were more homogeneous compared to changes in biopotentials. Desflurane and sevoflurane in 1 mM concentrations suppressed amplitudes of sodium, calcium and potassium currents by 40%, and inactivation of potassium low currents was speed up. Anesthetics in the concentration of 5-10 mM suppressed currents by 70-80%. It developed fast (for 20-30 seconds) and after this action the amplitudes restored slowly (for 5-15 minutes) and it failed to reach the initial values in all the times. Intercellular activity of sevoflurane did not suppress ion currents, i.e. it was ineffective.