Welcome to your 🧬 Parkinson Disease, Huntington Disease & Neurodegenerative Movement Disorders Arena — 40 Integrated MCQs
1.
A patient with a hereditary spinocerebellar disorder has normal muscle power but cannot accurately judge the distance of voluntary limb movements. Which finding best describes this deficit?
2.
A 59-year-old patient with progressive motor neuron disease develops slurred speech, swallowing difficulty and visible wasting of the tongue. Which pathological site best explains this combination?
3.
A patient with Parkinson disease starts selegiline and subsequently complains of difficulty sleeping. Which explanation best accounts for this adverse effect?
4.
A patient with Parkinson disease develops shorter periods of benefit from each levodopa dose as the disease progresses. Which pathological change most directly contributes to this loss of smooth response?
5.
A patient treated with levodopa alone begins taking large amounts of pyridoxine supplementation. His Parkinsonian symptoms become less controlled. Which mechanism best explains this change?
6.
A psychiatrist reviews a patient taking selegiline for Parkinson disease. The patient asks why the same drug can also have antidepressant effects under different treatment conditions. Which explanation is most accurate?
7.
A man with progressive motor neuron disease remains cognitively able to make decisions but develops severe limb weakness, dysarthria and declining independence. Which management approach best addresses the overall nature of his illness?
8.
A 36-year-old woman from a family with inherited neurological disease has progressive imbalance. Examination shows inaccurate finger-to-nose testing and a tremor that becomes more prominent as her finger approaches the target. Which system is primarily dysfunctional?
9.
A patient with motor neuron disease develops worsening dysphagia, recurrent coughing during meals and progressive weight loss despite dietary modification. Which intervention principle is most appropriate?
10.
A 62-year-old man with progressive motor neuron disease develops wasting of hand muscles. Muscle biopsy shows groups of small angular fibers rather than random individual fiber loss. Which process best explains this pattern?
11.
A 72-year-old man with Parkinson disease experiences recurrent fluctuations despite levodopa therapy. His physician adds a drug that prolongs levodopa benefit by reducing catechol-O-methyltransferase activity. Which class has been added?
12.
A child with Friedreich ataxia is attending follow-up. Neurological symptoms are slowly progressing, but the pediatrician also plans periodic assessment for an important metabolic association. Which abnormality should be considered?
13.
A patient develops Parkinsonian symptoms while receiving a dopamine-blocking drug. The offending drug is discontinued, but symptoms remain troublesome during recovery. Which pharmacological approach is most appropriate for symptomatic treatment?
14.
A patient taking levodopa with carbidopa develops involuntary choreiform movements after several years of therapy. His nausea has remained well controlled. Which interpretation best explains this pattern?
15.
A 65-year-old woman develops bilateral rigidity and bradykinesia two months after starting metoclopramide. Tremor is mild, and both sides are affected similarly. Which feature most strongly supports a medication-related rather than idiopathic process?
16.
A 70-year-old man with Parkinson disease has reduced facial expression, soft speech and progressively smaller handwriting. Which underlying functional disturbance best explains this combination?
17.
A patient receiving bromocriptine develops progressive breathlessness and is found to have fibrotic valvular changes. Which property of this drug is most closely related to this complication?
18.
A patient with motor neuron disease develops sudden inappropriate episodes of laughing and crying despite reporting no corresponding change in mood. Which neurological involvement most likely accounts for this finding?
19.
A man with Huntington disease initially presents with irritability and impaired planning before severe movement disability develops. Which explanation best accounts for these non-motor manifestations?
20.
A teenager with Friedreich ataxia has progressive imbalance that is more severe than would be expected from isolated cerebellar dysfunction. Which additional pathway involvement contributes importantly to his impaired position sense?
21.
A 14-year-old with Friedreich ataxia has worsening gait instability but remains independently mobile. The family asks which intervention is most appropriate at this stage to preserve function for as long as possible. Which is the single best approach?
22.
A patient with advanced Parkinson disease develops sudden episodes of severe immobility. A rapidly acting dopamine agonist is selected for rescue therapy. Which route is most appropriate for reliable rapid effect?
23.
Histological examination of the spinal cord from a patient with amyotrophic lateral sclerosis shows small eosinophilic cytoplasmic inclusions within degenerating motor neurons. Which pathological finding is being described?
24.
A 66-year-old man with Parkinson disease has a previous history of recurrent psychotic episodes. His physician is considering escalation of dopaminergic therapy. Which concern is most important when considering levodopa?
25.
A 69-year-old patient develops Parkinsonian features after starting a dopamine-receptor blocking medication. The drug is withdrawn, but symptoms continue to progress rather than gradually improve. Which interpretation is most appropriate?
26.
A patient with Parkinson disease receives levodopa together with carbidopa. Several weeks later, he develops vivid visual hallucinations. Which explanation best accounts for persistence of this adverse effect despite carbidopa therapy?
27.
A patient with Parkinson disease has coexisting untreated angle-closure glaucoma. Which property of levodopa therapy makes this comorbidity clinically relevant?
28.
A patient with motor neuron disease is offered edaravone as part of disease-modifying treatment. Its proposed therapeutic benefit is most closely related to reduction of which process?
29.
A 45-year-old woman with Huntington disease has increasingly uncontrolled movements. The abnormal movements are related to early degeneration of inhibitory neurons within the striatum. Which functional consequence best explains her motor manifestations?
30.
At autopsy, the midbrain of an elderly patient with long-standing Parkinson disease shows marked pallor of the substantia nigra. Which pathological process most directly accounts for this gross appearance?
31.
A 49-year-old laboratory worker develops severe Parkinsonian features after accidental exposure to a neurotoxic compound. The toxin selectively damages nigrostriatal dopaminergic neurons and produces a syndrome resembling Parkinson disease. Which compound best fits this mechanism?
32.
A 38-year-old man develops progressive behavioral change and involuntary movements. His father developed the same disorder at 52 years of age. Genetic testing shows that the patient has a larger repeat expansion than his father. Which phenomenon best explains the earlier presentation in the son?
33.
A 15-year-old girl with Friedreich ataxia develops progressive spinal curvature and high-arched feet. Which management approach is most appropriate for these complications?
34.
A patient taking levodopa is prescribed a non-selective monoamine oxidase inhibitor for another condition. Which clinically important consequence is the main reason this combination should be avoided?
35.
A 12-year-old boy has progressive gait difficulty and dysarthria. Examination shows impaired joint-position sense, extensor plantar responses and foot deformity. Genetic testing demonstrates a GAA repeat expansion. Which protein is primarily deficient?
36.
A patient with Parkinson disease has severe bradykinesia despite treatment. The therapeutic team explains that dopamine normally facilitates movement by influencing both major basal ganglia pathways. Which combined effect best describes normal dopaminergic action?
37.
A neuropathologist examining tissue from a patient with motor neuron disease identifies abnormal accumulation of a DNA/RNA-binding protein in affected neurons. Which protein is characteristically associated with many cases of amyotrophic lateral sclerosis?
38.
A patient receiving levodopa reports that the drug works less reliably when taken with a large protein-rich meal. Which pharmacokinetic explanation is most appropriate?
39.
A patient with advanced Huntington disease undergoes brain imaging. Marked atrophy of the caudate nuclei has altered the contour of the lateral ventricles. Which imaging change is most likely?
40.
A 64-year-old man with amyotrophic lateral sclerosis has increasing morning headaches, weak cough and breathlessness when lying flat. Which management priority is most appropriate?
