A child is admitted with circumferential burns of the left arm. Following the initial assessment, what is the most urgent intervention the nurse should anticipate to prevent complications such as compartment syndrome?

Application of a topical antimicrobial to the burned area.

Immediate escharotomy to relieve pressure and improve circulation.

Fluid resuscitation via large-bore intravenous access.

Administering pain medication to manage the child's discomfort.