AIIMS Rishikesh NO - 2019
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: AIIMS Rishikesh NO - 2019
Explanation
- Dopa-responsive dystonia (DRD), or Segawa disease, is caused by a genetic defect that impairs the body's ability to produce dopamine.
- The treatment is fundamentally different because it involves a simple replacement therapy using low doses of levodopa (a precursor to dopamine).
- This treatment is highly specific and effective, leading to a dramatic, rapid, and sustained resolution of dystonic symptoms.
- This near-complete reversal of symptoms with a replacement therapy is unique among the given options.
Why Other Options Were Wrong
- Option A: PKAN is a form of neurodegeneration with brain iron accumulation (NBIA). Its treatment is primarily symptomatic and supportive, aiming to manage the progressive dystonia and rigidity but not addressing the underlying cause. Iron chelation therapy has shown limited effectiveness.
- Option B: Like PKAN, PLAN is another form of NBIA. Treatment focuses on managing symptoms of this progressive neurodegenerative disorder rather than correcting the root cause. Its management strategy is not fundamentally different from other neurodegenerative conditions.
- Option D: Wilson disease is a disorder of copper metabolism. While its treatment with chelating agents (like D-penicillamine) is causal (it removes the toxic substance), it is aimed at halting the progression of neurodegeneration. The response is slow and often incomplete, which is different from the rapid and dramatic improvement seen in DRD.
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Differential treatment of genetic movement disorders involving dystonia and the basal ganglia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- The most critical clinical point is to consider Dopa-responsive dystonia in any child or adolescent presenting with dystonia, especially if it fluctuates during the day.
- Because DRD is so treatable, a diagnostic trial of levodopa is often recommended in patients with unexplained dystonia to avoid misdiagnosis as cerebral palsy or a more severe, untreatable neurodegenerative disorder.
- What if? If a patient with Dopa-responsive dystonia is misdiagnosed with cerebral palsy, they would be subjected to years of unnecessary and ineffective physical therapy and antispasmodic medications, while a simple, low-dose pill could have completely resolved their symptoms.
How to Approach the Question
- First, identify the core of the question: you need to find the disorder among the four options that has a unique treatment strategy.
- Recognize that all four conditions involve dystonia and the basal ganglia, so the difference must lie in the pathophysiology and, consequently, the treatment.
- Briefly recall or look up the treatment for each disorder. Categorize them: Is the treatment symptomatic (managing symptoms) or causal (addressing the root cause)?
- You'll find that PKAN/PLAN have symptomatic treatment, while DRD and Wilson disease have causal treatments.
- Now, compare the two causal treatments. Wilson disease treatment involves removing a toxin (copper) to halt progression, a slow process. DRD treatment involves replacing a deficient substance (dopamine), which results in a rapid and dramatic reversal of symptoms.
- Conclude that the nature and remarkable efficacy of the replacement therapy for DRD make its treatment approach fundamentally different from the others.
Concept Tested & Keywords
- Concept Tested: Differential treatment of genetic movement disorders involving dystonia and the basal ganglia.
- Stem keywords: dystonia, basal ganglia, PKAN, PLAN, Dopa-responsive dystonia, Wilson disease, treatment
- Lead-in keywords: fundamentally different
- Negative lead-in flag: false
Question ID
QRiB1CoSeCLAakIvn1wEaB
Reference Book
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 601-603
E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1491-1493
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
Practise the full AIIMS Rishikesh NO - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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