Clinical meaning
Papilledema is edema of the optic disc caused by elevated intracranial pressure (ICP) transmitted through the optic nerve sheath to the optic nerve head. The three main causes are increased intracranial pressure (space-occupying lesions, hydrocephalus, idiopathic intracranial hypertension), retrobulbar neuritis (optic nerve inflammation, often associated with multiple sclerosis), and changes in retinal blood vessels. Early signs include distension of retinal veins, loss of the optic cup, and blurring of the disc margins. In later stages, the optic disc becomes visibly elevated. Unlike other causes of disc edema, papilledema specifically refers to disc swelling from elevated ICP and is typically bilateral. The nurse monitors neurological status, reports visual changes, and assists with positioning and safety measures.
Exam relevance
Risk factors: - Space-occupying intracranial lesions (tumors, abscesses) - Hydrocephalus - Idiopathic intracranial hypertension (pseudotumor cerebri) - Cerebral venous sinus thrombosis - Meningitis or encephalitis - Obesity (risk factor for IIH) - Medications: tetracyclines, vitamin A, corticosteroid withdrawal - Hypertensive crisis