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Pentobarbital and halothane hyperpolarize cat alpha-motoneurons.

J F Whitney, L L Glenn

|August 27, 1986

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Anesthetics like halothane and pentobarbital hyperpolarized spinal alpha-motoneurons by 5 mV, reducing synaptic activity. This suggests adjustments are needed for accurate electrophysiological recordings in awake preparations.

Area of Science:

Neuroscience
Anesthesiology
Electrophysiology

Background:

Spinal alpha-motoneurons are crucial for motor control.
Anesthetics can alter neuronal membrane potentials, affecting electrophysiological measurements.
Understanding these effects is vital for accurate research in awake preparations.

Purpose of the Study:

To investigate the impact of halothane and pentobarbital on the membrane potential of spinal alpha-motoneurons in awake-intact cats.
To determine the extent of membrane potential changes and synaptic activity alterations induced by these anesthetics.

Main Methods:

Electrophysiological recordings were performed on spinal alpha-motoneurons in awake-intact cats.
Cats were sequentially anesthetized with either halothane (5%) or pentobarbital (35 mg/kg).

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Changes in membrane potential and spontaneous synaptic activity were measured.

Main Results:

Both halothane and pentobarbital induced a significant hyperpolarization of approximately 5 mV in spinal alpha-motoneurons.
Spontaneous synaptic activity in motoneurons was reduced under both anesthetic conditions.
A reduction in excitatory postsynaptic potential (EPSP) frequencies was implicated in the observed hyperpolarization.

Conclusions:

Anesthetics significantly alter spinal alpha-motoneuron membrane potential, causing hyperpolarization and reduced synaptic activity.
The findings suggest that the criterion for acceptable motoneuron impalements in awake preparations should be adjusted by approximately 5 mV more depolarized compared to anesthetized preparations.
Accurate electrophysiological data requires consideration of anesthetic-induced membrane potential shifts.