Final answer:
The nurse must report the inability to palpate the pedal pulse prior to the fasciotomy, as it suggests possible compromised blood flow to the limb, which requires urgent medical attention.
Step-by-step explanation:
The nurse should report the finding of an inability to palpate pedal pulse to the provider prior to surgery. This is a critical sign as it may indicate a lack of adequate blood flow to the affected extremity, which is a concern especially after a procedure such as an open reduction internal fixation and can be an indicative of a potential compartment syndrome or other vascular compromise. Other worrying signs that should be noted, although not part of the multiple-choice options, include the extremity being cool and pale, the reported tingling and numbness, and the extreme pain rated as 10 despite analgesic medication. All these signs require immediate medical attention to prevent further complications.