[Hypophosphatemia: cause or consequence?]

Area of Science:

• Nephrology
• Neurology
• Endocrinology

Background:

• Hypophosphatemia is defined as serum phosphate below 0.80 mmol/l, with severe cases under 0.32 mmol/l.
• Causes include acute cellular shifts and chronic phosphate depletion.
• Glucosuria, elevated urinary glucose, is less common with fewer identified causes.

Observation:

• A 52-year-old patient presented with a seizure.
• The patient exhibited severe hypophosphatemia (0.26 mmol/l).
• A possible Fanconi syndrome diagnosis was considered.

Findings:

• Severe hypophosphatemia was identified as the likely cause of the patient's seizure.
• The case highlights the dual role of hypophosphatemia in seizures, as both a consequence and a cause.
• Glucosuria was also noted in the patient.

Implications:

• Emphasizes the need for thorough hypophosphatemia work-up in patients presenting with seizures.
• Highlights the importance of recognizing intracellular phosphate shifts as a potential seizure etiology.
• Underscores the diagnostic challenge of conditions like Fanconi syndrome presenting with metabolic derangements.