Final answer:
The nurse should initially check the client's respiratory rate due to the nature of myasthenia gravis, which can impair breathing. If concerns arise regarding the medication, like morphine sulfate, the nurse should notify the registered nurse and question the order. Monitoring blood pressure and administering medication are also important but secondary to assessing respiratory status.
Step-by-step explanation:
Based on the information provided, an adult client was admitted with myasthenia gravis, which is a neuromuscular disorder characterized by weakness and fatigue of voluntary muscles. When reviewing the client's medication administration record (MAR), the licensed practical nurse (LPN)/licensed vocational nurse (LVN) noticed medication information. In this situation, the nurse should initially check the client's respiratory rate because myasthenia gravis can affect the muscles involved in breathing, potentially leading to respiratory distress. If the LPN/LVN has any concerns regarding the prescribed medication, such as morphine sulfate which can further depress respiratory function, they should notify the registered nurse and question the medication order as appropriate. Monitoring the client's blood pressure and administering the medication as scheduled could also be important steps, but ensuring the safety of the client by checking their respiratory status is the most immediate action required given the nature of myasthenia gravis.