A client presents with a surgical incision that is red, swollen, and warm to touch. How should the nurse prioritize the hypothesis regarding the cause?

Choice A rationale Pressure injuries typically present as localized areas of tissue necrosis or skin breakdown over bony prominences such as the sacrum or heels. While they can involve inflammation if infected, the classic signs of redness, swelling, and warmth specifically at a surgical incision site are more indicative of a localized inflammatory response to pathogens. Pressure injuries are graded by stages rather than the acute inflammatory symptoms often seen with post-surgical wound complications or cellulitis. Choice B rationale Dehydration involves a systemic fluid volume deficit that manifests as poor skin turgor, dry mucous membranes, and concentrated urine. It does not cause localized redness, swelling, or warmth at an incision site. While adequate hydration is essential for the biochemical processes of wound healing, its absence leads to delayed healing or tissue friability rather than the classic signs of inflammation. Normal skin turgor and moist membranes are indicators of a balanced fluid status in patients. Choice C rationale Malnutrition, particularly protein-calorie malnutrition or vitamin C deficiency, impairs the synthesis of collagen and slows the inflammatory phase of wound healing. However, it is not a direct cause of acute redness, heat, and swelling at a surgical site. Chronic nutritional deficits may lead to wound dehiscence or delayed closure, but the immediate presence of warmth and edema usually signals an active immune response to a foreign invader or internal injury within the tissue. Choice D rationale Infection is the primary hypothesis when a surgical incision displays redness, swelling, and warmth. These are the cardinal signs of inflammation caused by the immune system responding to microbial invasion. Pathogens trigger vasodilation and increased capillary permeability, leading to the heat and edema observed. A normal white blood cell count ranges from 5000 to 10000 mm, and an elevation beyond this range often confirms the nurse's suspicion of a localized or systemic infection.