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Fatal familial insomnia: Reporting a case of the rare nightmare

E Hogue1, D Weinberg2, E Palecek2

  • 1College of Medicine, Medical University of South Carolina, Charleston SC, USA.

Journal of Postgraduate Medicine
|December 11, 2024
PubMed

Insights

Fatal familial insomnia (FFI) is a rare, inherited prion disease. Genetic testing is crucial for diagnosis, as standard tests may be inconclusive for this fatal neurodegenerative condition.

Area of Science:

  • Neurology
  • Genetics
  • Pathology

Background:

  • Prion diseases are fatal neurodegenerative disorders caused by misfolded proteins.
  • Fatal familial insomnia (FFI) is a rare, hereditary prion disease with nonspecific early symptoms.
  • Early diagnosis of FFI is challenging due to the lack of characteristic findings in initial standard diagnostic tests.

Observation:

  • A patient with a family history of prion disease presented with early FFI symptoms: sleep disturbances, cognitive decline, and autonomic dysfunction.
  • Standard diagnostic investigations, including MRI, CSF analysis, and EEG, were unremarkable for prion disease.
  • Genetic testing revealed a pathogenic mutation (c.532G>A or p.Asp178Asn), confirming the FFI diagnosis.

Findings:

  • Genetic analysis is essential for diagnosing FFI, especially when conventional methods are negative.
  • The identified mutation c.532G>A (p.Asp178Asn) confirms the hereditary nature of FFI in this patient.
  • The patient experienced rapid disease progression and mortality within months of initial presentation.

Implications:

  • Increased awareness among general practitioners is vital for timely FFI diagnosis and improved patient management.
  • Understanding FFI pathophysiology aids in developing diagnostic and therapeutic strategies for prion diseases.
  • Addressing the emotional and psychological needs of patients and families is critical in managing this devastating illness.

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