A 3-year-old child is admitted to the pediatric unit with severe diarrhea for the past 3 days. The child appears lethargic, has sunken eyes, and decreased skin turgor. Vital signs are: temperature 101.2°F (38.4°C), heart rate 140 bpm, respiratory rate 28/min, blood pressure 85/50 mmHg. The mother reports the child has had minimal oral intake and only 2 wet diapers in the past 12 hours. What is the nurse's priority action?

A 3-year-old child presents with a 3-day history of severe diarrhea, lethargy, sunken eyes, decreased skin turgor, tachycardia (140 bpm), and critically reduced urine output (2 wet diapers in 12 hours). Vital signs show a temperature of 101.2°F (38.4°C), respiratory rate of 28/min, and a narrowed pulse pressure of 85/50 mmHg.

This presentation is consistent with severe dehydration progressing to hypovolemic shock secondary to acute gastroenteritis. The compensatory tachycardia and narrowed pulse pressure indicate the cardiovascular system is struggling to maintain perfusion against significant intravascular volume depletion. Altered mental status (lethargy) signals inadequate cerebral perfusion, a critical warning sign.

The immediate priority is to establish intravenous (IV) access and initiate rapid fluid resuscitation with isotonic crystalloids (e.g., 20 mL/kg bolus of normal saline or lactated Ringer's). This directly addresses the life-threatening circulatory collapse. Oral rehydration is contraindicated in this scenario due to the child's depressed level of consciousness, which creates a high risk for aspiration, and because the enteral route cannot restore intravascular volume quickly enough to reverse shock.

1. Secure IV Access: Obtain the largest-bore IV catheter possible, ideally two sites if the child is critically ill.
2. Initiate Fluid Bolus: Administer isotonic crystalloid bolus as ordered, typically starting at 20 mL/kg, and reassess vital signs and perfusion status after each bolus.
3. Continuous Monitoring: Place the child on continuous cardiorespiratory monitoring and pulse oximetry. Monitor heart rate, blood pressure, urine output (strict intake and output), and mental status closely.
4. Diagnostic Workup: Once the child is stabilized, obtain blood for electrolytes, blood urea nitrogen, creatinine, and glucose. A stool culture may be sent if indicated, but only after initial resuscitation is underway.
5. Transition to Oral Rehydration: As the child's clinical status improves and mental status normalizes, begin transitioning to oral rehydration therapy with small, frequent volumes.

• In pediatric patients, hypotension is a late and ominous sign of shock; tachycardia and poor perfusion are earlier, more reliable indicators.
• Urine output of less than 1 mL/kg/hour in children is a key marker of inadequate renal perfusion and significant dehydration.
• Always prioritize airway, breathing, and circulation (ABCs). In this case, the "C" (circulation) is acutely compromised and demands immediate intervention.