Final answer:
The nurse should inform the client to stop activity and take the sublingual nitroglycerin as directed if acute angina occurs.
Step-by-step explanation:
The nurse should include in the teaching that if acute angina occurs, the client should stop activity and take the medication as directed. Sublingual nitroglycerin is a medication used to relieve chest pain in heart disease by dilating coronary arteries and improving blood flow. It should be taken when angina symptoms occur and can be repeated every 5 minutes for up to three doses, with a maximum of nine doses in a 30-minute period.