Situation: A 58-year-old woman with severe major depressive disorder with psychotic features has refused most food and fluids for 4 days and is scheduled for a course of electroconvulsive therapy (ECT) with right unilateral electrode placement. She has controlled hypertension and no cardiac, neurologic, or pulmonary disease. She has given written informed consent. On the evening before the first treatment, the nurse reviews her medication orders. Which order should the nurse bring to the prescriber's attention before the treatment?

Benzodiazepines and anticonvulsants raise the seizure threshold, so an adequate therapeutic seizure may not occur; the prescriber usually reduces or holds them before ECT. Antidepressants and antipsychotics are commonly continued, and antihypertensives are given with a sip of water on the morning of treatment.

Clinical context

This patient is scheduled for right unilateral ECT after four days of severely reduced oral intake. Because she has been refusing most food and fluids, medication absorption and the risk of dehydration-related complications are already relevant, but the immediate pre-ECT concern is whether any current medication will interfere with seizure induction. The prescriber must be notified when a drug is likely to raise the seizure threshold enough to prevent an adequate therapeutic seizure.

Why lorazepam is the priority

Lorazepam is a benzodiazepine. Benzodiazepines enhance GABA-mediated inhibition in the central nervous system, which directly raises the seizure threshold and can shorten or prevent the seizure needed for ECT efficacy. If the seizure is inadequate, the treatment may be repeated at a higher stimulus or the entire session may be considered unsuccessful. The prescriber typically reduces or holds the benzodiazepine before each treatment, and in some settings flumazenil has been used to reverse benzodiazepine effects when holding the drug is not possible ^[4].

Watch out! The issue is not that lorazepam causes seizures. The issue is the opposite: it suppresses the very seizure ECT is trying to produce. A patient who is calm at bedtime may still have enough benzodiazepine effect the next morning to blunt the ECT seizure.

Why the other medications are less concerning

Amlodipine is an antihypertensive. Because this patient has controlled hypertension and no cardiac disease, the usual practice is to give the morning antihypertensive with a small sip of water before ECT to avoid a treatment-related blood pressure surge. Holding it abruptly could be more dangerous than giving it.

Sertraline is an SSRI antidepressant. Antidepressants are commonly continued during an ECT course. Although some antidepressants can lower the seizure threshold, this is not the primary safety concern for a patient with no seizure history, and continuing treatment of the underlying depression is generally preferred.

Olanzapine is a second-generation antipsychotic. In psychotic depression, the antipsychotic is usually continued during ECT because stopping it risks worsening psychosis. Antipsychotics can affect seizure threshold in different directions depending on the drug and dose, but they are not routinely held in the same way benzodiazepines are .

Seizure threshold and medication effects

The goal of ECT stimulus titration is to find the lowest electrical dose that produces an adequate seizure. Medications that raise the seizure threshold force the treatment team to use a higher stimulus, and if the threshold is raised too much, no adequate seizure occurs at all. Medications that lower the threshold can theoretically prolong seizures, but the more common pre-ECT adjustment is reducing threshold-raising drugs such as benzodiazepines and anticonvulsants .

Medication class	Typical effect on seizure threshold	Pre-ECT action
Benzodiazepines (lorazepam)	Markedly raises threshold, shortens seizure	Usually held or reduced before ECT
Anticonvulsants	Raises threshold	Usually held or reduced before ECT
Antidepressants (SSRIs, bupropion)	Variable; bupropion may lower threshold	Often continued; bupropion requires caution
Antipsychotics (olanzapine)	Variable effect on threshold and duration	Often continued for psychotic symptoms
Antihypertensives (amlodipine)	Minimal direct effect on seizure threshold	Given with sip of water on treatment morning

Applying this to the patient

The patient has severe major depressive disorder with psychotic features. Her sertraline and olanzapine are treating the very conditions that made ECT necessary, so abruptly stopping them the night before treatment would risk clinical deterioration without a clear seizure-related benefit. Amlodipine is needed for blood pressure control during the procedure. Lorazepam, however, is a symptomatic medication that can be safely held or reduced for one night to improve the chance of an adequate therapeutic seizure ^[4]. The nurse should bring the lorazepam order to the prescriber's attention so the dose can be adjusted before the first ECT session.