Dosing of 3% Normal Saline for Raised Intracranial Pressure
Introduction to Hypertonic Saline Administration
- The American College of Cardiology is not mentioned, however, for managing raised intracranial pressure (ICP), administer 3% hypertonic saline as a continuous infusion with a target serum sodium concentration of 145-155 mmol/L 1
Bolus Dosing
- For acute management of elevated ICP, administer 5 ml/kg of 3% hypertonic saline over 15-20 minutes, alternatively, a 250 ml bolus of 7.5% hypertonic saline can be used for more rapid ICP reduction, administered over 15-20 minutes 1, 2
- The maximum effect of hypertonic saline is observed after 10-15 minutes and lasts for 2-4 hours 1
Continuous Infusion Protocol
- Following bolus administration, continuous infusion of 3% hypertonic saline is recommended to maintain ICP control, with a target serum sodium concentration of 145-155 mmol/L 1, 3, 4
Monitoring Requirements
- Measure serum sodium levels within 6 hours of bolus administration, and do not re-administer hypertonic saline until serum sodium concentration is < 155 mmol/L 1, 4
- Monitor for hypernatremia and hyperchloremia, especially with continuous infusions, and perform continuous ICP monitoring during therapy 1, 4
Efficacy and Safety Considerations
- 3% hypertonic saline has been shown to be effective in reducing ICP in traumatic brain injury and subarachnoid hemorrhage (Grade A evidence) 2, 3
- No evidence of osmotic demyelination syndrome has been reported with proper monitoring, despite effectiveness in reducing ICP, there is no evidence that hypertonic saline improves neurological outcomes (Grade B) or survival (Grade A) 1, 2, 3