[Anesthesia and non-conventional transmissible agents (or prion diseases)]

Area of Science:

• Neuroscience and prion diseases
• Pathology of neurodegenerative disorders
• Infectious disease epidemiology

Background:

• Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases including Creutzfeldt-Jakob disease (CJD), kuru, scrapie, and bovine spongiform encephalopathy (BSE).
• These diseases are characterized by spongiform degeneration, neuronal loss, and the misfolding of the cellular prion protein (PrPc) into an abnormal isoform.
• Atypical presentations and the risk of iatrogenic or variant CJD (nvCJD), potentially linked to BSE, necessitate improved diagnostic and safety measures.

Purpose of the Study:

• To review the characteristics, diagnostic challenges, and transmission risks associated with transmissible spongiform encephalopathies (TSEs).
• To highlight the importance of early diagnosis and appropriate sterilization procedures in managing prion diseases.
• To discuss the neuropathological and clinical variations observed in CJD and related disorders.

Main Methods:

• Review of neuropathological findings, including spongiform changes, gliosis, and prion protein conformation.
• Analysis of clinical presentations, diagnostic methods (EEG, CSF 14-3-3 immunoassay, tonsil biopsy), and their limitations.
• Examination of potential transmission routes, including iatrogenic and variant forms, and the resistance of the infectious agent to sterilization.

Main Results:

• Spongiform encephalopathies exhibit significant neuropathological and clinical heterogeneity.
• The 14-3-3 immunoassay in cerebrospinal fluid and tonsil biopsy Western blot show promise for early diagnosis.
• The prion agent's resistance to sterilization poses a major challenge, requiring strict handling protocols and disposable equipment.

Conclusions:

• Early and accurate diagnosis of TSEs is essential for patient management and preventing iatrogenic spread.
• The distinct characteristics of nvCJD suggest a link to BSE, emphasizing the need for surveillance.
• Strict adherence to sterilization protocols and the use of disposable medical devices are critical due to the agent's resistance.