Which of the following is most characteristic of Creutzfeldt-Jakob disease?

• A. Myoclonus
• B. Hemiparesis
• C. Tardive dyskinesia
• D. Bradykinesia

Answer: (A)

Creutzfeldt-Jakob disease (CJD) is a rapidly progressive neurodegenerative disorder characterized by several clinical features, with myoclonus being one of the most distinctive. Myoclonus refers to sudden, involuntary muscle jerks, which are a hallmark symptom of CJD. This symptom arises as the disease affects the brain, leading to the characteristic neurological decline and involuntary movements commonly seen in patients.

While other options present symptoms that might be observed in various neurological conditions, they are not characteristic of CJD. Hemiparesis refers to weakness on one side of the body, which is more typical in conditions such as stroke rather than in CJD. Tardive dyskinesia, characterized by repetitive, involuntary movements, is usually seen in association with prolonged use of certain medications and not specific to prion diseases. Bradykinesia, which involves slowness of movement, is a common feature of Parkinson’s disease and other extrapyramidal syndromes, rather than CJD.

Thus, myoclonus stands out as the most characteristic symptom of Creutzfeldt-Jakob disease, alongside other cognitive and behavioral changes, solidifying its significance in the clinical presentation of this neurodegenerative