Inducing an Acute Electroconvulsive Seizure in a Rat Model

Electroconvulsive seizure or ECS is an experimental animal model of Electroconvulsive Therapy or ECT to study seizure-induced neuroplasticity.

To create an ECS model, take ear-clip electrodes connected to a pulse generator.

Wet the ear-clip electrodes and the rat’s ears with sterile saline to enhance electrical conductivity.

Attach one clip per ear, positioning them beyond the main cartilage band for optimal current distribution.

Then, press the shock button on the pulse generator for a few seconds to deliver electrical stimulation to the rat’s head.

This stimulation activates voltage-gated ion channels in neurons, causing rapid depolarization.

As a result, neurons fire uncontrollably, bypassing normal inhibitory regulation and leading to neuronal hyperexcitability and seizure activity.

When the rat exhibits clonus, a rhythmic, involuntary muscle jerking due to seizure activity, disconnect the ear clips.

Record the seizure behavior and duration.

Finally, after seizure termination, allow the rat to recover.

Wet the ear clips with sterile saline and ensure that they are saturated. Next, wet the rat's ears with sterile saline by wrapping them in saline soaked gauze. Once they are wet, remove the gauze. Attach the clips to the ears at one clip per ear and position them beyond the main cartilage band. Press the shock button for a few seconds and observe the seizure.

As clonus begins, disconnect the ear clips and record the seizure behavior according to a revised racine's scale of 1 to 5. This includes rearing with forelimb clonus at stage 4, and rearing and falling with forelimb clonus at stage 5. The seizure should last approximately 10 seconds. Record the seizure duration using a timer.

Following seizure termination, return the rat to its home cage. Monitor the rat for another five minutes to make sure of its recovery from the seizures. Keep it singly housed in the cage and return the cage to the recovery room.