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Dehydration

NCLEX Review Guide: Pediatric Dehydration - Metabolic & Endocrine Considerations

Pathophysiology & Assessment

Dehydration Classifications

  • Mild dehydration (3-5% fluid loss): Slightly dry mucous membranes, normal skin turgor, alert child with mild thirst
  • Moderate dehydration (6-9% fluid loss): Dry mucous membranes, delayed skin turgor, sunken eyes, decreased urine output
  • Severe dehydration (>10% fluid loss): Very dry mucous membranes, tenting skin turgor, sunken fontanelles (infants), altered mental status

Memory Aid: "DEHYDRATION"

Dry mucous membranes
Eyes sunken
Heart rate increased
Yearning for fluids
Decreased urine output
Reduced skin turgor
Altered mental status
Thirst increased
Increased specific gravity
Oliguria present
No tears when crying

Key Points

  • Infants and toddlers are at highest risk due to higher metabolic rate and larger body surface area
  • Weight loss is the most accurate indicator of fluid deficit in children
  • Capillary refill >2 seconds indicates poor perfusion

Types of Dehydration

Dehydration Types Comparison

Type Serum Sodium Clinical Presentation Priority Intervention
Isotonic 130-150 mEq/L Proportional water/sodium loss Standard fluid replacement
Hypotonic <130 mEq/L Seizures, cerebral edema risk Slow, careful sodium replacement
Hypertonic >150 mEq/L Neurological symptoms, irritability Gradual fluid replacement
CRITICAL ALERT: Never correct severe hypernatremia rapidly - risk of cerebral edema and seizures. Decrease sodium by no more than 10-12 mEq/L per 24 hours.

Nursing Interventions & Management

Fluid Replacement Protocol

  1. Calculate fluid deficit: Pre-illness weight - current weight = fluid deficit in kg (1 kg = 1 liter fluid loss)
  2. Determine maintenance fluids: 100 mL/kg/day for first 10 kg + 50 mL/kg/day for next 10 kg + 20 mL/kg/day for each kg >20
  3. Replace deficit gradually: 50% of deficit in first 8 hours, remaining 50% over next 16 hours
  4. Monitor electrolytes: Check sodium, potassium, chloride every 4-6 hours during active replacement

Clinical Scenario

Case: 2-year-old with gastroenteritis, 10% weight loss, lethargic, dry mucous membranes, no tears when crying, skin tenting present.

Priority Actions: Establish IV access, begin isotonic fluid replacement, monitor vital signs hourly, assess neurological status, strict I&O monitoring.

Key Points

  • Oral rehydration therapy (ORT) is first-line for mild-moderate dehydration if child can tolerate PO intake
  • IV therapy indicated for severe dehydration, vomiting, or inability to maintain oral intake
  • Monitor for signs of fluid overload: increased work of breathing, crackles, peripheral edema

Commonly Confused Points

Dehydration vs. Overhydration Signs

Assessment Dehydration Overhydration
Skin Turgor Delayed/tenting Normal to edematous
Mucous Membranes Dry, sticky Moist
Fontanelles Sunken Bulging
Urine Output Decreased (<1 mL/kg/hr) May be normal or increased

Quick Check: Severe Dehydration Red Flags

  • ✓ Altered mental status/lethargy
  • ✓ Absent tears when crying
  • ✓ Sunken eyes/fontanelles
  • ✓ Skin tenting >2 seconds
  • ✓ Capillary refill >3 seconds
  • ✓ Heart rate >20% above normal

Study Tips & Common Pitfalls

NCLEX Success Strategies

Common Pitfalls to Avoid:
  • Don't confuse percentage of dehydration with actual fluid deficit calculations
  • Remember that infants dehydrate faster than older children due to higher metabolic demands
  • Never give hypotonic solutions to children with increased intracranial pressure

Priority Nursing Actions Mnemonic: "FLUID"

Frequent vital signs and neurological assessments
Laboratory values monitoring (electrolytes, BUN, creatinine)
Urine output measurement (goal: 1-2 mL/kg/hr)
IV access establishment and fluid replacement
Daily weights (same time, same scale, same clothing)

Key Points

  • Always assess for underlying causes: diabetes, renal disease, gastrointestinal losses
  • Document intake and output meticulously - include all sources of fluid loss
  • Educate parents on signs of dehydration and when to seek medical care

Self-Assessment Checklist

  • ☐ Can I differentiate between mild, moderate, and severe dehydration?
  • ☐ Do I know the fluid replacement calculations for pediatric patients?
  • ☐ Can I identify priority nursing interventions for each type of dehydration?
  • ☐ Do I understand the risks of rapid fluid/electrolyte correction?
  • ☐ Can I recognize signs of fluid overload during treatment?

Remember: You've got this! Pediatric dehydration questions test your ability to prioritize care and recognize subtle changes in children. Trust your assessment skills and always consider the child's developmental stage when planning interventions. Every question you master brings you closer to becoming an excellent nurse!

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