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Cortical blindness after correction of symptomatic hyponatremia: dynamic cerebral dysfunction visualized using serial
1Department of Neurology, University of Massachusetts Medical Center, Worcester 01655, USA.
Summary
Rapid correction of hyponatremia can cause temporary cortical blindness due to regional hyperperfusion. Single-photon emission computed tomography (SPECT) scanning may help study osmotic disturbance-induced cerebral dysfunction.
Area of Science:
- Neurology
- Neuroimaging
- Metabolic Disorders
Background:
- Hyponatremia, a condition of low sodium levels, can lead to neurological symptoms.
- Rapid correction of hyponatremia is associated with osmotic demyelination syndrome, but transient visual disturbances are less understood.
Observation:
- A 70-year-old woman experienced cortical blindness following hyponatremia correction.
- Initial SPECT scans revealed regional cerebral hyperperfusion in the acute phase.
- Symptoms resolved, and follow-up examinations were normal.
Findings:
- The observed regional hyperperfusion was not linked to structural brain damage.
- This phenomenon may represent luxury perfusion or increased metabolic demand in dysfunctional cortical areas.
- SPECT imaging demonstrated potential utility in assessing cerebral dysfunction from osmotic disturbances.
Implications:
- This case highlights a potential neuroimaging finding in osmotic disturbances.
- SPECT scanning could be a valuable tool for studying transient cerebral dysfunction.
- Understanding these mechanisms aids in managing electrolyte imbalances and their neurological consequences.