Anticonvulsant-induced rickets and nephrocalcinosis

Area of Science:

• Nephrology
• Pediatric Endocrinology
• Clinical Pharmacology

Background:

• Valproic acid is a widely used anticonvulsant.
• Proximal tubulopathies can lead to serious metabolic disturbances.
• Nephrocalcinosis is an uncommon complication of proximal tubulopathy.

Observation:

• A severely disabled young girl developed Fanconi syndrome after long-term valproic acid administration.
• The patient also presented with nephrocalcinosis, a rare finding in proximal tubulopathy.
• Concomitant use of another anticonvulsant may have contributed to the nephrocalcinosis.

Findings:

• Valproic acid can induce Fanconi syndrome, leading to hypophosphatemic rickets.
• Nephrocalcinosis can occur as a rare complication of valproic acid-induced proximal tubulopathy.
• Combined anticonvulsant therapy might potentiate renal complications.

Implications:

• Increased awareness of rare anticonvulsant-related renal complications is crucial for healthcare providers.
• Monitoring for Fanconi syndrome and nephrocalcinosis in patients on long-term valproic acid is recommended.
• Further research into the mechanisms of anticonvulsant-induced nephrotoxicity is warranted.