Final answer:
The patient with a deep electrical burn affecting muscle, blood vessels, and nerves has a fourth-degree burn, the most severe burn category requiring significant medical intervention.
Step-by-step explanation:
The patient you are treating has a deep electrical burn that extends into muscle, blood vessels, and nerves. This type of burn is categorized as a fourth-degree burn. Fourth-degree burns are the most severe, with full thickness damage to skin as well as to underlying muscle and bone. Unlike third-degree burns which also damage nerve endings and can appear white, red, or black, fourth-degree burns extend even further and are not typically painful due to completely damaged nerve endings. These burns are significant and require medical interventions such as excision (debridement) or possibly amputation, followed by grafting of skin for recovery.