The client with arteriosclerosis is scheduled for a cardiac catheterization. Which of the following is the primary responsibility of the nurse prior to the procedure? A. Explain the procedure to the client B. Check the laboratory results for a prothrombin time C. Take the client's vital signs D. Obtain a permit for the examination

Begin by understanding the context of the question. The client in question has arteriosclerosis, and they are scheduled for a cardiac catheterization, a medical procedure used to diagnose and treat cardiovascular conditions. The nurse has specific responsibilities before the procedure, and we need to identify the primary responsibility among the given options.

Now, we will analyze the options provided: A. Explain the procedure to the client - This is important, as it helps the client understand what's going to happen during the procedure, and provides a chance to address any concerns or questions. B. Check the laboratory results for a prothrombin time - Prothrombin time is a blood test that measures how long it takes blood to clot, which can be crucial information prior to a procedure like cardiac catheterization, as it may affect bleeding risk. C. Take the client's vital signs - Monitoring the client's vital signs is an essential responsibility of a nurse and can be helpful to detect any abnormal condition and assess the overall health status of the patient, but may not necessarily be the primary responsibility. D. Obtain a permit for the examination - Getting a permit (i.e. informed consent) for the procedure is a legal and ethical requirement to ensure the client agrees to the procedure and is aware of the potential risks and benefits.

Among the given options, the primary responsibility of the nurse prior to cardiac catheterization is to obtain a permit for the examination (Option D), as it ensures the client's consent, and maintains legal and ethical standards. Although other options are important aspects of the nurse's responsibilities, obtaining informed consent is crucial before any medical procedure can take place.