Electrolyte Management in Traumatic Brain Injury

Initial Assessment and Monitoring

The American College of Anaesthesia recommends monitoring sodium and potassium levels closely in all traumatic brain injury patients, as electrolyte imbalances are nearly universal and directly impact mortality and neurological outcomes 1

The American College of Anaesthesia recommends avoiding prolonged hypernatremia to control intracranial pressure in severe TBI patients, due to the weak relationship between serum sodium and ICP, risk of "rebound" ICP during correction, potential to worsen cerebral contusions, and associated hyperchloremia that may impair renal function (Grade 2-, Strong Agreement) 1, 2, 3
The American College of Anaesthesia suggests using osmotherapy, such as mannitol 20% or hypertonic saline at 250 mOsm, infused over 15-20 minutes, for threatened intracranial hypertension, signs of brain herniation, and other specific emergencies (Grade 1+, Strong Agreement) 5

The American College of Anaesthesia recommends using 0.9% saline as the only isotonic crystalloid for brain injury, and avoiding hypotonic solutions, such as Ringer's lactate and Ringer's acetate, as they increase brain water 6
The American College of Anaesthesia advises against using 4% albumin solution in severe TBI patients, due to increased mortality risk (Grade 2-, Strong Agreement) 5
The American College of Anaesthesia recommends avoiding synthetic colloids in fluid management 6

The Praxis Medical Insights guideline suggests distinguishing between SIADH and cerebral salt wasting by assessing volume status, urine sodium, and cardiovascular signs, including orthostatic changes, to properly diagnose and treat hyponatremia 4