Intravenous Fluid Administration Guidelines

Introduction to Maintenance Fluids

The American Academy of Pediatrics (AAP) recommends that patients requiring maintenance intravenous fluids (IVFs) should receive isotonic solutions with appropriate potassium chloride and dextrose 1
The Infectious Diseases Society of America (IDSA) states that once the patient is rehydrated, maintenance fluids should be administered, and ongoing losses should be replaced until diarrhea and vomiting are resolved 2
For patients with dehydration, intravenous rehydration should be continued until pulse, perfusion, and mental status normalize 3

Standard maintenance fluid rates should be followed, with adults typically receiving 1-2 mL/kg/hour based on clinical status, and children's rates based on weight using the Holliday-Segar formula (4-2-1 rule) 4
For patients with specific conditions like acute pancreatitis, fluid administration rates may vary between non-aggressive (<10 mL/kg/hour) and aggressive (>10 mL/kg/hour) based on severity 5

For patients with traumatic brain injury, normal saline is preferred over Lactated Ringer's solution to maintain plasma osmolality 4
For patients with severe liver failure, the metabolism of lactate in Lactated Ringer's solution may be compromised 4
In patients with short bowel syndrome requiring overnight hydration, continuous administration is particularly important to maintain fluid balance 6, 7

Continuous administration of maintenance fluids helps maintain steady plasma volume and electrolyte concentrations, and allows for better physiological handling of the fluid load compared to bolus administration 1
Lactated Ringer's solution is slightly hypotonic (osmolarity 273 mOsm/L) with a sodium concentration of 130 mEq/L, and should be administered continuously throughout the night rather than as a single bolus to ensure proper hydration and electrolyte balance 1