Which statement about lignocaine is correct?

Which statement about lignocaine is correct?

A 79-year-old man with Alzheimer's disease is found to have significant elevation of liver function tests on routine follow-up examination. Which of the following medications should be maintained at current doses in this patient?

A 62-year-old retired small business owner has had slowly increasing intraocular pressure bilaterally. You start him on drug used to treat his open-angle glaucoma, which also happens to cross the blood–brain barrier better than other drugs in its class. Which of the following drugs is this?

A 67-year-old man with early onset of Alzheimer's disease is being seen by his primary care physician. Consideration is being made to begin preemptive therapy with an anticholinesterase inhibitor. The patient and family are made aware of such side effects as nausea, vomiting, diarrhea, and muscle cramps. The mechanism of action of these effects likely involves which of the following?

A 38-year-old man with chronic anxiety and agitation is currently being treated with a long-acting benzodiazepine. He is having challenges with sleep and is referred to a sleep center for a 24-h sleep study to further ascertain his difficulties. Which of the following is the most likely abnormality to be noted on this study?