A 29-year-old woman presents to the ED 45 minutes after spilling boiling water onto her right forearm while cooking. The affected area is circumferential from the wrist to the mid-forearm. Exam shows a shiny, pale, insensate area with overlying leathery eschar. Her fingers are cool with delayed capillary refill; radial pulse is weak compared with the left. She reports increasing tightness and pain proximal to the burned area. Oxygen saturation is 99% on room air and breath sounds are normal. Which of the following is the most appropriate next step in management?

(Assume IV access, analgesia, and fluid resuscitation are being initiated as needed.)