This article discusses the process of electroconvulsive therapy (ECT) in treating depression. It details the physiological mechanisms involved, including neuronal activation and the role of neurotrophic factors.
Begin with an anesthetized patient diagnosed with depression, fitted with adhesive pads on the temples for electroconvulsive stimulation.
In the brain, the electrical current activates neuronal sodium channels, causing rapid sodium influx.
This leads to neuronal depolarization and triggers neuronal firing.
Excessive synchronized firing releases excitatory neurotransmitters, resulting in persistent neuronal activation and inducing a seizure.
Seizure activity enhances the release of neurotrophic factors, promoting neurogenesis and improving neuronal communication, which helps alleviate depression-like symptoms.
Additionally, seizure activity stimulates the sympathetic nervous system, causing pupil dilation.
Immediately after seizure cessation, position an automated infrared pupillometer over one eye to measure the pupillary response.
Activate the device to emit white light to constrict the pupil.
In the patient, the absence of pupil constriction after light exposure indicates prolonged sympathetic activation and adequate seizure induction.
After anesthetizing the patient, begin the electroconvulsive therapy or ECT procedure by using an ECT instrument set at an initial electrical stimulus dose percentage at half the value of the patient's age.
Then, immediately after electrical stimulation, hold the automated infrared pupillometer over one of the patient's eyes. After the patient's eyes are opened by an examiner, press the device button and measure maximum resting pupil size or minimum pupil size after stimulation. Next, perform controlled ventilation using a face mask with 100%oxygen until the patient begins breathing spontaneously.
Finally, using EEG, measure ictal regularity, seizure time, and greater post-ictal suppression.
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