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Huntington Disease

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In one line

·Huntington disease is an inherited brain disorder where mutant huntingtin protein kills neurons in the striatum, causing progressive movement problems, dementia, and psychiatric symptoms with no cure.

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Normal physiology

·The brain uses specialized regions called the basal ganglia (clusters of nerve cells deep in the brain) to coordinate smooth, purposeful movement and support thinking and emotion. The striatum (the largest part of the basal ganglia) receives signals from the cortex (the brain's outer layer) and sends refined instructions to other brain areas to control movement precision and suppress unwanted motions. Neurons (nerve cells) in the striatum use chemical messengers called neurotransmitters (brain chemicals that carry signals between nerve cells) to communicate. Healthy huntingtin protein supports neuron survival, helps transport materials inside cells, and regulates gene activity in the nucleus (the cell's control center).

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What goes wrong

·In Huntington disease, a gene mutation adds extra DNA building blocks to the huntingtin gene, creating an abnormally long stretch of repeating code. This mutation causes cells to make a misshapen huntingtin protein that clumps together inside neurons and becomes toxic. The mutant protein damages the cell's power plants, disrupts gene control, and triggers the cell's self-destruct program, slowly killing neurons in the striatum and other brain regions over decades.

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Hallmark signs

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Red flags · escalate now

·New or worsening suicidal thoughts (suicide risk is 4 to 6 times higher than general population)
·Choking episodes or recurrent pneumonia (suggests aspiration and need for swallow evaluation and feeding tube discussion)
·Rapid weight loss despite adequate intake (signals disease progression and increased metabolic demands)
·Severe agitation, aggression, or psychosis (requires urgent psychiatric evaluation and medication adjustment)

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Workup

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Treatment

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NCLEX trap

·Assess the cause of agitation first (pain, constipation, infection, fear) and use non-pharmacologic interventions; antipsychotics are reserved for severe psychiatric symptoms because they can worsen motor function and carry serious side effects.
·Huntington disease is autosomal dominant, affecting males and females equally; each child of an affected parent has a 50% chance of inheriting the mutation regardless of sex.
·Restraints increase agitation, injury risk, and distress; instead, pad bed rails, remove sharp objects, provide a safe walking environment, and allow supervised movement to preserve dignity and function.
·Weight loss occurs despite adequate intake due to hypermetabolism from constant involuntary movements; patients need high-calorie, high-protein diets with frequent small meals and may require 5,000 or more calories daily.
·Presymptomatic genetic testing requires extensive genetic counseling, psychological assessment, and informed consent because a positive result profoundly affects life planning, mental health, and family dynamics; testing is always voluntary.
·Psychiatric and cognitive symptoms often appear before motor signs, cause greater distress, and increase suicide risk; holistic care addressing mood, behavior, safety, and family support is essential from diagnosis onward.

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