Necrotizing vasculitis associated with diphenylhydantoin: two fatal cases

Area of Science:

• Toxicology
• Pathology
• Pharmacology

Background:

• Diphenylhydantoin (Dilantin) is a widely used anticonvulsant medication.
• Adverse reactions to diphenylhydantoin, including toxic and allergic responses, are well-documented.
• Necrotizing vasculitis is a severe inflammatory condition affecting blood vessels.

Observation:

• Two fatal cases of widespread necrotizing vasculitis were observed in patients undergoing diphenylhydantoin therapy.
• This specific vascular complication associated with diphenylhydantoin is exceedingly rare, with only two prior reports in the literature.
• The presented cases exhibited unique characteristics within the spectrum of necrotizing angiitides.

Findings:

• The study presents two distinct cases of fatal necrotizing vasculitis linked to diphenylhydantoin (Dilantin).
• It underscores the rarity of this severe vascular adverse drug reaction, previously reported only twice.
• Analysis reveals similarities and peculiar features of this condition among the reported cases.

Implications:

• Highlights the potential for severe, life-threatening vascular complications from diphenylhydantoin therapy.
• Emphasizes the importance of recognizing necrotizing vasculitis as a rare but critical adverse effect.
• Contributes to the understanding of drug-induced vasculitis and its management.