D5 Fluid Hourly Infusion Rate
For adults, infuse D5-containing fluids at approximately 100 mL/hour to maintain blood glucose and provide maintenance hydration, which delivers about 5 grams of dextrose per hour. 1
Standard Adult Dosing
- The typical maintenance rate is 100 mL/hour for an average 70 kg adult, calculated from the standard 100 mL/kg per 24 hours formula. 1
- This rate provides sufficient glucose (approximately 5 grams/hour) to prevent hypoglycemia while avoiding hyperglycemia. 1
- Blood glucose should be monitored every 1-2 hours when initiating D5W infusions to ensure the rate is appropriate. 1
Clinical Context Adjustments
Diabetic Ketoacidosis
- Switch to D5-containing fluids at 4-14 mL/kg/hour (approximately 280-980 mL/hour for a 70 kg adult) once serum glucose reaches 200-250 mg/dL during DKA treatment. 1, 2
- This higher rate maintains glucose in target range while continuing insulin therapy to resolve ketoacidosis. 1
Hypoglycemia Management
- After initial correction of acute hypoglycemia, continuous D5W at 100 mL/hour prevents recurrent episodes. 1
- For continuous infusion in severe hypoglycemia or insulin overdose, use D10W at 100 mL/kg per 24 hours (approximately 290 mL/hour for 70 kg adult), titrating to maintain blood glucose between 100-180 mg/dL. 3
Adrenal Insufficiency
- Initial fluid bolus of 20 mL/kg of D5NS over the first hour (1400 mL for 70 kg adult), followed by maintenance rates of 100-150 mL/hour. 1, 2
Special Population Considerations
Cardiac or Renal Compromise
- Limit D5W rates to 100 mL/hour or less in patients with cardiac or renal compromise. 1
- Monitor closely for fluid overload with frequent assessment of volume status. 2
- Use cautiously in congestive heart failure or chronic renal disease to prevent volume overload. 2
Pediatric Patients
- Use weight-based calculations: 100 mL/kg/24h for first 10 kg, 50 mL/kg/24h for 10-20 kg, and 20 mL/kg/24h for remaining weight. 1, 2
- Isotonic or near-isotonic solutions (D5 0.9% NaCl) are preferred over hypotonic fluids to prevent hospital-acquired hyponatremia. 4
Critical Safety Considerations
Maximum Dextrose Infusion Rate
- Do not exceed 5-7 mg/kg/minute of dextrose (approximately 350-490 mg/minute or 21-29 grams/hour for 70 kg adult) to avoid hyperglycemia. 3
- Dextrose infusion rates exceeding 4-5 mg/kg/min significantly increase the risk of hyperglycemia, even in patients not predisposed to hyperglycemia. 5
Discontinuation Protocol
- Never abruptly discontinue dextrose infusion in insulin overdose patients. 3
- Reduce infusion rate by 50% over the final 30 minutes before discontinuing to prevent rebound hypoglycemia. 3
Electrolyte Monitoring
- Check serum potassium and sodium levels carefully, as dextrose administration causes electrolyte shifts. 3
- Monitor every 1-2 hours during ongoing dextrose infusion. 3
Common Pitfalls to Avoid
- Avoid reflexive full-dose administration of concentrated dextrose solutions, as rapid and repeated large doses can cause excessive blood glucose elevation and have been associated with cardiac arrest and hyperkalemia. 3
- D50W is irritating to veins; dilution to D10W or D25W is preferable for peripheral administration. 3
- Titrate based on initial glucose level and patient response rather than administering fixed large doses. 3