Final answer:
The PN should replace the saturated linens, ensure the client's hydration, and continue to monitor vital signs, possibly administering antipyretics if ordered.
Step-by-step explanation:
After assessing the client's vital signs and finding that they are diaphoretic with saturated linens, the Practical Nurse (PN) should take immediate action to address the fever and potential fluid loss. The PN should first replace the soiled linens to prevent the client from getting chills and to maintain a clean environment. It is also important to ensure the client is well-hydrated because excessive sweating can lead to dehydration. The PN should offer fluids, if appropriate, and continue to monitor the client's vital signs closely. In some cases, depending on the healthcare setting and scope of practice, administering antipyretics, as ordered by the healthcare provider, to help reduce the fever might be an appropriate step.