Final answer:
An elevated temperature requires further assessment when preparing a patient for a CT scan with an IV contrast agent due to the potential for increased heart rate, adverse effects on heart contraction, and risk of reaction to the contrast medium.
Step-by-step explanation:
The nurse should identify that an elevated temperature requires further assessment when a client is to undergo a CT scan with an IV contrast agent. We know from several case studies and medical notes that elevated body temperature, or hyperthermia, affects the heart by increasing heart rate (HR) and strength of contraction. In extreme cases, hyperthermia can lead to the cessation of normal body functions, including those of the central nervous system. Furthermore, patients with an elevated temperature might be at higher risk of contrast-induced nephropathy or adverse reactions to the contrast medium.
It's important to note that the other listed findings (increased heart rate, decreased blood pressure, normal respiratory rate) in the context of pre-scan preparation may not be as immediately concerning as an elevated temperature. However, a comprehensive assessment would address any abnormal findings in vitals before a procedure involving a contrast agent due to the potential for complications.