Final answer:
The wife should advise the client to call emergency services immediately.
Step-by-step explanation:
In this case, the wife should advise the client to call emergency services immediately. Angina pectoris is a condition characterized by chest pain due to reduced blood flow to the heart muscles. If the client has taken 2 sublingual nitroglycerin tablets without relief, it is indicative of a more severe episode that requires urgent medical attention.