A client is admitted to the intensive care unit (ICU) after a colon resection with the formation of a loop colostomy. The nurse determines the client's abdominal dressing is clean and dry. Vital signs are temperature 100° F (37.8° C) orally, heart rate 132 beats/minute, blood pressure 88/65 mm Hg, and urine output 10 mL/hour. Which intervention should the nurse implement?

A. Place a cooling blanket on the client. A temperature of 100°F (37.8°C) is only mildly elevated and does not require active cooling. The priority concern is hemodynamic instability due to hypovolemia, not fever management. Cooling blankets are typically used for high fevers (≥ 102°F or 38.9°C). B. Administer an antipyretic agent. While fever may indicate postoperative infection or inflammatory response, the client’s most critical issue is hypotension and low urine output, suggesting hypovolemia or early shock. Treating the underlying cause (fluid loss) is more urgent than giving an antipyretic. C. Give a 500 mL IV fluid bolus challenge. The client has tachycardia (132 bpm), hypotension (88/65 mm Hg), and oliguria (10 mL/hour), all of which suggest hypovolemic shock, a common postoperative complication. A fluid bolus (typically 500–1000 mL of isotonic crystalloid such as normal saline or lactated Ringer’s) is the first-line treatment to restore intravascular volume, improve blood pressure, and increase urine output. D. Titrate IV vasopressor for systolic less than 80. Vasopressors (e.g., norepinephrine) are not the first-line treatment for hypovolemic shock. Fluids should be administered first to correct volume loss before considering vasopressors. If hypotension persists despite adequate fluid resuscitation, vasopressors may be initiated.