Management of Vomiting Caused by Increased Intracranial Pressure (ICP)

Initial Assessment and Management

Vomiting is a common symptom of increased ICP, often accompanied by headache, altered mental status, and gait abnormalities 1
Immediate neuroimaging (preferably contrast-enhanced MRI) should be performed to evaluate for hydrocephalus, mass lesions, or other causes of increased ICP 1
Maintain head of bed elevation at 20-30° to help reduce ICP through improved venous drainage 2
Ensure adequate airway protection, as vomiting increases aspiration risk in patients with altered consciousness 3

Repeated lumbar punctures to reduce pressure - remove sufficient CSF to reduce pressure to 50% of opening pressure or 200 mm H₂O, whichever is greater 1
Continue daily lumbar punctures for approximately 4 days until pressure stabilizes to <250 mm H₂O 1
Administer antiemetics promptly to control vomiting and reduce risk of aspiration 3
Maintain adequate cerebral perfusion pressure (CPP) ≥60 mmHg while managing ICP 2
Osmotic diuretics: Mannitol (0.5-1 g/kg IV bolus) is effective for acute management of increased ICP 4
Mannitol dose may be repeated once or twice as needed, provided serum osmolality remains <320 mosm/L 4
Avoid prophylactic use of mannitol; only administer when clinical signs of increased ICP are present 4

If medical therapy with repeated lumbar punctures fails to stabilize ICP, neurosurgical consultation for shunting procedures is necessary 1
Early neurosurgical consultation is recommended as most patients with persistently increased ICP will require permanent shunt placement 1
Ventriculoperitoneal or lumboperitoneal shunting may be required for long-term management 5
For patients with shunts who develop new vomiting, evaluate for shunt malfunction or infection 5

Monitor for signs of neurological deterioration: changes in mental status, pupillary abnormalities, or worsening symptoms 6
Repeat neuroimaging if there is any change in mental status, vomiting, cranial neuropathy, or gait disturbance 1
Watch for signs of hydrocephalus on imaging: ventriculomegaly and transependymal edema 1
Monitor opening pressure during lumbar punctures to assess treatment efficacy 1

In patients with coagulopathy, correction of coagulation abnormalities may be necessary before lumbar puncture 7
Hyperventilation should be avoided as a prophylactic measure but may be considered for acute, life-threatening increased ICP not controlled by other measures 4
In patients with renal impairment, mannitol may cause volume overload requiring dialysis 4
Corticosteroids may be beneficial in certain cases of increased ICP, particularly when associated with inflammation, though evidence is mixed 6

Avoid indiscriminate use of sedatives which may mask neurological deterioration 3
Do not rely solely on clinical signs for diagnosis as papilledema and other classic signs may be late findings 6
Avoid prophylactic hyperventilation as it may cause cerebral vasoconstriction and potentially worsen cerebral edema 4