What is the total body surface area (TBSA) burned in a 1‑year‑old, 10 kg female with burns involving the left anterior neck, upper anterior chest, and top of the left shoulder?

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Burn TBSA Estimation in a 1-Year-Old

The estimated TBSA burned is approximately 6.5-7% using the pediatric Lund-Browder chart, which is the gold standard for children and must be used instead of the Rule of Nines.

Anatomical Area Breakdown

For a 1-year-old child with burns to the left anterior neck, upper anterior chest, and top of left shoulder:

  • Anterior neck: ~1% TBSA
  • Upper anterior chest (assuming upper third of anterior trunk): ~3-4% TBSA
  • Top of left shoulder: ~1.5-2% TBSA

Total: Approximately 6.5-7% TBSA

Critical Method Selection

You must use the pediatric Lund-Browder chart 1. The Wallace Rule of Nines significantly overestimates TBSA and is explicitly not suitable for children 1. In pediatric patients, body proportions differ dramatically from adults—infants have proportionally larger heads (20% vs 9% in adults) and smaller lower extremities 2.

Why This Matters for Management

This 1-year-old with ~7% TBSA burned requires:

  1. Immediate fluid resuscitation: Administer 20 mL/kg crystalloid (200 mL for this 10 kg child) within the first hour, regardless of TBSA calculation 1. This early bolus addresses the hypovolaemic phase before precise TBSA assessment.

  2. Burn center referral: This child meets criteria for specialized burn center admission 1:

    • Infant < 1 year of age (automatic criterion)
    • Burns in function-sensitive area (neck)
    • TBSA > 10% threshold is NOT met, but age alone mandates referral

  3. Subsequent fluid management: After initial bolus, calculate maintenance fluids using Holliday-Segar 4-2-1 rule (40 mL/hr for 10 kg) PLUS modified Parkland formula (3-4 mL/kg/%TBSA) 1:

    • Maintenance: 40 mL/hr
    • Resuscitation: 3 mL × 10 kg × 7% = 210 mL over 24 hours (additional ~9 mL/hr)
    • Total: ~49 mL/hr, titrated to urine output 0.5-1 mL/kg/hr

Common Pitfalls to Avoid

TBSA overestimation is epidemic: Studies show 70-94% of cases overestimate TBSA 1, with burns between 10-20% TBSA overestimated most frequently 3. This leads to fluid overload ("fluid creep") and increased morbidity 1.

The "palm = 1%" rule: Use the entire palmar surface of the hand (palm + fingers), which equals ~1% TBSA 1, 4. The palm alone is only 0.5% TBSA 4. This quick estimation method helps but should be confirmed with formal Lund-Browder assessment.

Repeat assessment: TBSA must be recalculated during initial management as initial estimates are frequently inaccurate 1. Consider smartphone applications like E-Burn for improved accuracy 1, 5.

References

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