Final answer:
If the AEMT is struggling with an IV line and refuses your assistance, it's best to not engage during the call and calmly speak to them about it later.
Step-by-step explanation:
If the AEMT is having difficulty establishing an IV line and refuses your assistance, it is important to handle the situation appropriately. The best course of action would be to not engage in the situation and calmly speak to the AEMT about it after the call. This approach allows you to maintain a professional and respectful environment, while also addressing the issue and offering assistance when necessary.