During the first 24 hours after the burn, fluid replacement is the treatment priority. The assessment that will alert the nurse that the fluid replacement is ineffective is:

A. Crackles in the lungs may indicate fluid overload or pulmonary complications, but in the first 24 hours after a burn, the primary concern is hypovolemia and shock. While crackles require monitoring, they are not the first indicator of ineffective fluid replacement. B. Urine output is the most reliable indicator of effective fluid resuscitation in burn patients. The goal is typically 0.5–1 mL/kg/hr for adults. A urine output of 20 mL/hr in an average adult suggests insufficient perfusion and inadequate fluid replacement, signaling that the current fluid therapy is ineffective and needs adjustment. C. Significant edema in the burn area is expected after burns due to increased capillary permeability and does not indicate ineffective fluid replacement. Edema is part of the normal inflammatory response and occurs even with appropriate fluid resuscitation. D. A rectal temperature of 101°F indicates mild hyperthermia, which may be related to the inflammatory response, infection risk, or environmental factors. It is not a primary indicator of fluid replacement effectiveness.