INI-CET EXAM -2026
Medical & Surgical Nursing
Medium
The given disorders are associated with dystonia and basal ganglia involvement. Which one requires a fundamentally different treatment approach than the others?
Appeared in: INI-CET EXAM -2026
Explanation
- Wilson disease is an autosomal recessive disorder of copper metabolism, leading to toxic accumulation of copper in the liver, brain, and other tissues.
- The treatment is fundamentally different because it targets this root metabolic cause.
- Primary therapy involves lifelong use of chelating agents, such as D-penicillamine or trientine, to remove excess copper from the body.
- Zinc salts are also used to block the intestinal absorption of copper.
- This approach is a systemic metabolic intervention, unlike treatments for the other disorders which target the neurological symptoms or pathways directly.
Why Other Options Were Wrong
- Option A: PKAN (Pantothenate kinase-associated neurodegeneration) is a form of neurodegeneration with brain iron accumulation (NBIA). Its treatment is primarily symptomatic, focusing on managing the severe dystonia and rigidity with medications like baclofen, botulinum toxin, or procedures like deep brain stimulation. Iron chelation therapy has shown limited effectiveness.
- Option B: PLAN (PLA2G6-associated neurodegeneration) is another form of NBIA, similar to PKAN. The management strategy is also supportive and symptomatic, aimed at alleviating the motor symptoms of dystonia and parkinsonism.
- Option C: Dopa-responsive dystonia (DRD) has a very specific and effective treatment, but it is a neurotransmitter replacement therapy. Patients have a defect in dopamine synthesis and show a dramatic and sustained positive response to low doses of levodopa, a dopamine precursor. While highly specific, this mechanism of replacing a deficient neurotransmitter is a common strategy in neurological disorders.
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Differential diagnosis and treatment of genetic disorders causing dystonia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Accurate diagnosis of dystonia is critical because some underlying causes, like Wilson disease and Dopa-responsive dystonia, are highly treatable. Misdiagnosis can lead to irreversible neurological damage.
- A nurse should be aware that a patient with new-onset movement disorders, especially in childhood or early adulthood, requires a thorough workup that includes screening for metabolic conditions like Wilson disease.
- What if? If a young patient with dystonia and liver abnormalities is encountered, Wilson disease should be high on the differential diagnosis list, and a serum ceruloplasmin level and 24-hour urinary copper excretion test should be promptly ordered. Early initiation of chelation therapy can prevent permanent disability.
How to Approach the Question
- First, understand the core of the question: it asks to identify which of the four listed disorders has a treatment approach that is fundamentally different from the others.
- Recognize that all options are disorders that cause dystonia and involve the basal ganglia, so the differentiation must be based on their treatment.
- Systematically recall or analyze the treatment for each condition.
- Categorize the treatment mechanisms: Is it symptomatic (managing symptoms), replacement (providing a deficient substance), or etiological (addressing the root cause)?
- Compare the categories: PKAN/PLAN treatment is symptomatic. Dopa-responsive dystonia treatment is neurotransmitter replacement. Wilson disease treatment is the removal of a toxic substance (copper chelation).
- Conclude that removing a toxic metal from the body (chelation) is a fundamentally different therapeutic principle than managing neurological symptoms or replacing a neurotransmitter.
Concept Tested & Keywords
- Concept Tested: Differential diagnosis and treatment of genetic disorders causing dystonia.
- Stem keywords: dystonia, basal ganglia, treatment approach, PKAN, PLAN, Dopa-responsive dystonia, Wilson disease
- Lead-in keywords: fundamentally different
Question ID
QTejp0LZbZST2zD2D-BtjV
Reference Book
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 601-603
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 2299-2301
E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1491-1493
Practise the full INI-CET EXAM -2026
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