A client with a seizure disorder is seen at the clinic for a follow-up visit and a prescription renewal for phenytoin. Which assessment finding warrants immediate intervention by the nurse?

Choice A reason: This is not an assessment finding that warrants immediate intervention by the nurse. Blood pressure 100/78 mm Hg is within the normal range for an adult, and it does not indicate any adverse effect of phenytoin. The nurse should monitor the blood pressure for any changes, but it is not a priority.Choice B reason: This is an assessment finding that warrants immediate intervention by the nurse. Double vision, or diplopia, is a sign of phenytoin toxicity, which can occur due to overdose, drug interactions, or impaired metabolism. Double vision can impair the client's vision, balance, and coordination, and increase the risk of falls and injuries. The nurse should stop the phenytoin infusion, if applicable, and notify the healthcare provider. The nurse should also check the serum phenytoin level and other vital signs, and prepare to administer an antidote, such as fosphenytoin, if indicated.Choice C reason: This is not an assessment finding that warrants immediate intervention by the nurse. Puffy, bleeding gums are a common side effect of phenytoin, which can cause gingival hyperplasia, or overgrowth of the gum tissue. Puffy, bleeding gums are not life-threatening, but they can affect the client's oral hygiene and appearance. The nurse should instruct the client to brush and floss the teeth regularly, and to visit a dentist for dental care.Choice D reason: This is not an assessment finding that warrants immediate intervention by the nurse. Chronic insomnia is not a common or serious side effect of phenytoin, which is an anticonvulsant that can have sedative effects. Chronic insomnia may be caused by other factors, such as stress, pain, or caffeine intake. The nurse should assess the client's sleep pattern and quality, and provide education and counseling on sleep hygiene and relaxation techniques.