Management of Elevated Intracranial Pressure with 3% Saline in Brain Bleed

Primary Indications for 3% Saline

The American Heart Association recommends administering 3% hypertonic saline as a continuous infusion when a patient with intracerebral hemorrhage develops clinical or radiological evidence of raised intracranial pressure, targeting a serum sodium of 145-155 mmol/L, particularly in patients with decreased level of consciousness, signs of transtentorial herniation, or hydrocephalus 1, 2
Clinical criteria that warrant hypertonic saline therapy include a Glasgow Coma Scale score ≤8 with evidence of elevated ICP, clinical signs of transtentorial herniation, and significant intraventricular hemorrhage with hydrocephalus 3

For acute ICP crisis, give 2 ml/kg of 3% saline as a bolus over 15-20 minutes, providing rapid ICP reduction with maximum effect at 10-15 minutes, lasting 2-4 hours 1, 2
Initiate continuous infusion of 3% hypertonic saline targeting serum sodium 145-155 mmol/L for sustained ICP control, which is superior to repeated boluses as it provides sustained ICP control over days and reduces frequency of ICP spikes 4, 5

Serum sodium must be measured within 6 hours of initiating therapy and every 6 hours thereafter, with a target range of 145-155 mmol/L and avoiding exceeding 155-160 mmol/L to prevent complications 1, 4, 5

Hypertonic saline is more effective than mannitol at equiosmolar doses for ICP reduction in intracerebral hemorrhage, producing significantly higher cerebral perfusion pressure 4
Early continuous 3% saline infusion reduced perihematomal edema evolution and ICP crises, with a trend toward reduced mortality 4

Prefer hypertonic saline over mannitol in brain bleed patients because it provides more rapid ICP reduction and greater increases in cerebral perfusion pressure, has a longer duration of action, and is preferred in patients with hypovolemia 4

Despite proven ICP reduction, hypertonic saline does not improve neurological outcomes or survival in patients with raised intracranial pressure, with Grade B evidence for neurological outcomes and Grade A evidence for survival 4, 5
Contraindications include not using hypertonic saline for volume resuscitation in hemorrhagic shock unless combined with severe head trauma and focal neurological signs, and avoiding use in patients with baseline sodium >155 mmol/L 4

Always combine hypertonic saline with head-of-bed elevation 20-30 degrees to assist venous drainage, adequate sedation and analgesia to control pain and agitation, maintaining cerebral perfusion pressure >70 mmHg, and avoiding hypotonic fluids 1, 2, 4

The American Society of Nephrology suggests that hypertonic saline avoids the osmotic diuresis and potential for acute kidney injury associated with mannitol, particularly relevant in CKD patients 6

The European Society of Intensive Care Medicine notes that meta-analysis of randomized trials showed hypertonic saline has a relative risk of 1.16 (95% CI, 1.00-1.33) for successful ICP control compared to mannitol, although the strength of evidence is not provided in this context 6