5.5 Neurostimulation: ECT & TMS

TCO III-K3 covers neurostimulation therapies — treatments that use electrical or magnetic energy to modulate brain activity for patients who have not responded adequately to medication and psychotherapy alone. The PMH-BC exam expects nurses to know indications, the informed-consent process, and pre-/post-procedure nursing care for electroconvulsive therapy (ECT) and transcranial magnetic stimulation (TMS).

Electroconvulsive Therapy (ECT)

ECT induces a brief, controlled, generalized seizure under general anesthesia to produce rapid, robust antidepressant and antipsychotic effects.

Indications

• Severe or treatment-resistant major depressive disorder, especially with psychotic features or catatonia
• Acute suicidality requiring rapid symptom relief
• Catatonia of any cause
• Depression during pregnancy when medication risk is a concern
• Severe bipolar depression or mania unresponsive to medication

Informed Consent

ECT requires voluntary, written informed consent that the patient (or legal guardian/surrogate for an incapacitated patient, per jurisdiction) may revoke at any time before or between treatments. This ties directly to the patient self-determination principles covered under legal-ethical practice — consent must cover the procedure, expected benefits, and risks, most notably memory effects.

Pre-Procedure Nursing Care

• Confirm NPO status (typically after midnight) to reduce aspiration risk under anesthesia
• Verify signed consent is current and understood
• Remove dentures, jewelry, and other loose items; have the patient void
• Obtain baseline vital signs and a pre-treatment assessment
• Administer a pretreatment anticholinergic (e.g., glycopyrrolate or atropine) as ordered to reduce oral secretions and blunt vagally mediated bradycardia from the seizure stimulus

The Procedure

Under general anesthesia with a short-acting muscle relaxant (succinylcholine) to prevent injury from generalized muscle contraction, a brief electrical stimulus is delivered through scalp electrodes (unilateral or bilateral placement) to produce a therapeutic seizure, typically monitored by EEG. A course is usually 6–12 treatments given two to three times per week; maintenance ECT at longer intervals may follow to prevent relapse.

Post-Procedure Nursing Care and Adverse Effects

• Monitor airway, vital signs, and level of consciousness in a recovery area until the patient is fully awake and oriented
• Expect and reassure the patient about transient post-ictal confusion
• The most common adverse effect is memory disturbance — anterograde and retrograde amnesia, usually most pronounced around the treatment course and improving over days to weeks, though some retrograde memory loss (especially with bilateral placement) can persist longer
• Headache and muscle soreness are common and usually managed with routine analgesics
• Rare but serious risks include prolonged seizure, aspiration, and cardiac arrhythmia — a reason ECT requires anesthesia support and cardiac monitoring

Transcranial Magnetic Stimulation (TMS)

TMS delivers repetitive magnetic pulses, typically over the left dorsolateral prefrontal cortex, to stimulate neuronal activity without inducing a generalized seizure.

Key Distinctions from ECT

Indications and Nursing Considerations

TMS is FDA-cleared for treatment-resistant depression (and OCD). Because it is noninvasive and requires no sedation, patients can resume normal activity, including driving, immediately after a session. Common side effects are mild — scalp discomfort and headache at the stimulation site. Screening before treatment must rule out ferromagnetic metal implants near the head, pacemakers/implanted electronic devices, and a personal history of seizures, which raise procedural risk. "Treatment-resistant" in this context generally means an inadequate response to at least two adequate trials of antidepressant medication at appropriate dose and duration.

Unilateral vs. Bilateral ECT Placement

Electrode placement is a therapeutic trade-off the nurse should be able to explain to a patient. Bilateral placement (an electrode on each side of the head) tends to produce a faster antidepressant response but carries a higher risk of cognitive and memory side effects. Right unilateral placement (both electrodes on the non-dominant side) generally causes fewer cognitive effects but may require more treatments or a higher stimulus dose to achieve an equivalent response. The prescribing team selects placement based on illness severity, urgency, and the patient's tolerance for cognitive risk.

Exam Application

A stem describing a patient scheduled for ECT who reports fear of "losing my memory" calls for patient education that memory effects are the most common adverse effect and are usually transient — not false reassurance that no memory loss will occur. A stem contrasting ECT and TMS almost always hinges on the anesthesia/consciousness distinction: if the patient is unconscious and a seizure is induced, it's ECT; if the patient is awake, alert, and can drive home, it's TMS.