A nurse is caring for a client who has undergone electroconvulsive therapy (ECT). The nurse should monitor the client for which of the following adverse effects of ECT?

Choice A reason: Voice alteration is not a recognized adverse effect of ECT. The procedure does not involve the vocal cords or laryngeal structures. Choice B reason: Neck pain may occur due to muscle tension or positioning, but it is not a common or primary adverse effect of ECT. Choice C reason: Memory deficits, particularly short-term memory loss, are a well-documented side effect of ECT. Clients may experience confusion and difficulty recalling recent events, which typically improves over time. Choice D reason: Headaches are a common but mild and transient side effect of ECT. They are usually managed with analgesics and do not pose significant clinical concern compared to cognitive effects.