Fluid Management in Pediatric Patients

Calculating Maintenance Fluid Requirements

The American Academy of Pediatrics recommends calculating pediatric maintenance fluid requirements using the Holliday-Segar formula, which is 4 mL/kg/hour for the first 10 kg, 2 mL/kg/hour for the second 10 kg, and 1 mL/kg/hour for each kilogram above 20 kg 1
For a 25 kg child, the total maintenance rate is 65 mL/hour, calculated as 40 mL/h for the first 10 kg, 20 mL/h for the second 10 kg, and 5 mL/h for the remaining 5 kg 1

The American Academy of Pediatrics recommends using isotonic fluids, such as 0.9% NaCl, for maintenance hydration in hospitalized children, especially during the first 24 hours 1
Isotonic fluids help reduce the risk of hospital-acquired hyponatremia 1

For hypovolemic shock, administer isotonic crystalloid boluses of 20 mL/kg (up to 60 mL/kg in the first hour if needed) 2
For moderate dehydration (6-9% fluid deficit), administer 100 mL/kg over 2-4 hours 3
For mild dehydration (3-5% fluid deficit), administer 50 mL/kg over 2-4 hours 3
After rehydration, return to maintenance fluid rates 3
Replace ongoing fluid losses in addition to maintenance requirements 3
For diarrhea, add 10 mL/kg for each watery stool 3
For vomiting, add 2 mL/kg for each episode 3

Monitor for signs of fluid overload and watch for clinical indicators of hydration status, including mental status, peripheral perfusion, and urine output 2

Avoid using hypotonic solutions for initial resuscitation as they can worsen hyponatremia 2
Be cautious with fluid administration in patients with renal failure or congestive heart failure, as they may require reduced maintenance rates 1
Don't continue maintenance rates without reassessment in changing clinical conditions 1

Increase maintenance fluids by 10-15% for each degree Celsius of fever above normal 1
Consider reduced maintenance rates in patients with kidney injury or heart failure 1
For patients with nephrogenic diabetes insipidus, calculate maintenance using: first 10 kg: 100 mL/kg/24h; 10-20 kg: 50 mL/kg/24h; remaining weight: 20 mL/kg/24h 4