Final answer:
The LVN should monitor the client's blood pressure for hypotension.
Step-by-step explanation:
A priority observation for the LVN to make after a c-section birth with an epidural anesthetic is monitoring blood pressure for hypotension.
During a c-section, an epidural anesthesia is given to numb the lower part of the body. This anesthesia can cause a decrease in blood pressure due to the medication's effects. Hypotension can be dangerous for the client and needs to be monitored closely.