Final answer:
Restlessness and agitation are common indicators of pain following surgery, with elevated blood pressure also potentially related, but less specific. Increased appetite and decreased heart rate are not typically associated with post-surgical pain.
Step-by-step explanation:
The assessment most likely related to pain one day after surgery is a) Restlessness and agitation. Pain can manifest in various ways; however, restlessness and agitation are common non-verbal indicators that a patient is experiencing discomfort or pain, especially when they are unable to articulate it. These symptoms can be observed in patients following surgery. Increased appetite is less likely immediately postoperative due to the effects of anesthesia and stress on the digestive system. An elevated blood pressure can be associated with pain, but it can also be influenced by other factors such as anxiety or preexisting hypertension. Decreased heart rate is generally not associated with pain; in fact, pain often causes a sympathetically mediated increase in heart rate.