Infusion Rate for Sodium Bicarbonate in Normal Saline
When sodium bicarbonate is mixed in 1 liter of normal saline to create a 150 mEq/L solution, infuse at 1-3 mL/kg/hour 1.
Specific Dosing Algorithm
For Continuous Infusion (Non-Cardiac Arrest)
- Preparation: Mix 150 mEq of sodium bicarbonate in 1 liter of normal saline (creates a 150 mEq/L solution)
- Infusion rate: 1-3 mL/kg/hour 1
- For a 70 kg adult: This translates to 70-210 mL/hour of the prepared solution
Context-Specific Rates
For sodium channel blocker poisoning or cocaine toxicity (the primary indication in the guidelines):
- Initial bolus: 50-150 mEq (1-3 mEq/kg) given first 1
- Then start continuous infusion at 1-3 mL/kg/hour of the 150 mEq/L solution 1
- Target pH: 7.50-7.55 (do not exceed 7.55) 2
- Target sodium: Do not exceed 155 mEq/L 2
For cardiac arrest (different approach):
- Rapid IV bolus of 44.6-100 mEq initially 3
- May repeat 50 mL (44.6-50 mEq) every 5-10 minutes as needed 3
- This is NOT a continuous infusion scenario
For less urgent metabolic acidosis:
- Infuse 2-5 mEq/kg over 4-8 hours 3
- For a 70 kg adult with 150 mEq/L solution: approximately 90-230 mL/hour
- Monitor closely and adjust based on blood gases 3
Critical Monitoring Parameters
Watch for these complications during infusion:
- Hypernatremia (keep sodium ≤155 mEq/L) 2, 1
- Alkalemia (keep pH ≤7.55) 2, 1
- Hypokalemia 1
- Hypochloremia 1
- Volume overload 1
Important Caveats
Pediatric patients require slower administration: The FDA label specifically warns that rapid injection (>10 mL/min) of hypertonic sodium bicarbonate in neonates and children under 2 years may cause hypernatremia, decreased cerebrospinal fluid pressure, and possible intracranial hemorrhage. Limit to no more than 8 mEq/kg/day in this population, and consider using a 4.2% solution instead 3.
Do not attempt full correction in the first 24 hours: The FDA label emphasizes that achieving complete normalization of CO2 content within the first day often leads to unrecognized alkalosis due to delayed ventilatory readjustment. Target a total CO2 of approximately 20 mEq/L by end of day one 3.
Different formulations exist: Adults typically receive 1 mEq/mL (8.4%) solution, while children receive 0.5 mEq/mL (4.2%) solution. Both are hypertonic 1.
The 2025 AHA guidelines 2 and 2023 AHA focused update 1 provide the most authoritative guidance, with the FDA label 3 offering additional safety parameters. The 1-3 mL/kg/hour rate for a 150 mEq/L solution represents the standard approach for continuous infusion therapy in critically ill patients requiring sodium bicarbonate.