Neurobehavioral Disorders - Eppp Knowledge

1. Which condition most commonly causes acute confusion and asterixis due to liver dysfunction?

   Hepatic encephalopathy. Hepatic encephalopathy occurs when liver failure allows toxins like ammonia to accumulate, causing confusion and motor signs like asterixis from metabolic disruption.

2. Which lobe lesion is most associated with disinhibition, poor judgment, and personality change?

   Frontal lobe lesion. Frontal lobe lesions disrupt executive functions and impulse control, leading to behavioral changes as the frontal cortex regulates judgment and inhibition.

3. Which neurobehavioral syndrome is most associated with bilateral amygdala damage and fearlessness?

   Klüver-Bucy syndrome. Klüver-Bucy syndrome results from amygdala damage, reducing fear responses and causing hyperorality due to impaired emotional processing.

4. Which diagnosis is most associated with acute, fluctuating attention and consciousness changes?

   Delirium. Delirium is characterized by rapid onset of altered mental status, including fluctuating disturbances in attention and consciousness, distinguishing it from chronic conditions.

5. Which condition is most associated with visual hallucinations and fluctuating cognition early in illness?

   Dementia with Lewy bodies. Dementia with Lewy bodies features early visual hallucinations and cognitive fluctuations due to alpha-synuclein pathology affecting cortical regions.

6. Identify the classic sleep-wake pattern change commonly seen in delirium.

   Sleep-wake cycle reversal or fragmentation. Delirium often disrupts the normal sleep-wake cycle, leading to daytime somnolence and nighttime agitation due to underlying physiologic disturbances.

7. Which movement disorder is associated with chorea plus progressive cognitive and psychiatric changes?

   Huntington disease. Huntington disease features caudate nucleus degeneration, leading to choreiform movements alongside cognitive decline and psychiatric symptoms from basal ganglia pathology.

8. What is the hallmark cognitive deficit required for a delirium diagnosis?

   Disturbance in attention (reduced ability to direct, focus, sustain, shift). Delirium requires a disturbance in attention as its core feature, reflecting reduced clarity of awareness and inability to focus or shift cognitive resources.

9. Which neurologic condition is most associated with rapidly progressive dementia and myoclonus?

   Creutzfeldt-Jakob disease. Creutzfeldt-Jakob disease involves prion protein misfolding, causing rapid neuronal loss manifested as accelerating dementia and myoclonic jerks.

10. Which Alzheimer disease cognitive domain is typically impaired earliest?

    Episodic memory (new learning and recall). In Alzheimer's disease, episodic memory impairment occurs first due to early neurofibrillary tangle accumulation in the medial temporal lobes.

11. Which syndrome is defined by anterograde amnesia with confabulation due to thiamine deficiency?

    Korsakoff syndrome. Korsakoff syndrome arises from thiamine deficiency damaging the mammillary bodies and thalamus, impairing memory formation and prompting confabulation to fill gaps.

12. Which acute neurologic event commonly presents with postictal confusion after abnormal movements?

    Seizure. Seizures involve paroxysmal neuronal discharges, followed by postictal confusion due to temporary cortical dysfunction after the event.

13. What core motor feature commonly co-occurs with dementia with Lewy bodies?

    Parkinsonism (bradykinesia, rigidity, tremor). Parkinsonism arises in dementia with Lewy bodies from dopaminergic neuron loss in the substantia nigra, paralleling motor symptoms in Parkinson's disease.

14. Which neurocognitive disorder is most associated with stepwise decline after cerebrovascular events?

    Vascular neurocognitive disorder. Vascular neurocognitive disorder results from cumulative cerebrovascular damage, causing abrupt declines corresponding to infarcts or ischemic events.

15. Identify the behavioral presentation most typical of a left hemispheric stroke.

    Aphasia (language impairment). Left hemispheric strokes often impair language functions because the dominant hemisphere houses Broca's and Wernicke's areas critical for speech and comprehension.

16. Which demyelinating disease often presents with relapsing neurologic deficits and cognitive fatigue?

    Multiple sclerosis. Multiple sclerosis causes demyelination in the central nervous system, resulting in episodic deficits and fatigue from disrupted neural transmission.

17. Which disorder classically presents with resting tremor, bradykinesia, and later cognitive slowing?

    Parkinson disease. Parkinson's disease involves nigrostriatal dopamine depletion, causing motor symptoms early and cognitive slowing later due to broader cortical involvement.

18. Which endocrine disorder can present with depression, cognitive slowing, and psychomotor retardation?

    Hypothyroidism. Hypothyroidism reduces thyroid hormone levels, slowing metabolic processes and leading to neuropsychiatric symptoms like depression and cognitive impairment.

19. Which acute neurologic process most strongly suggests sudden aphasia and unilateral weakness?

    Stroke (cerebrovascular accident). Stroke causes abrupt focal neurologic deficits like aphasia and hemiparesis due to sudden interruption of blood flow to specific brain regions.

20. What behavioral presentation is most characteristic of pseudobulbar affect after neurologic injury?

    Involuntary, disproportionate laughing or crying. Pseudobulbar affect stems from disruption of cortico-bulbar pathways, resulting in emotional expressions incongruent with internal feelings post-injury.

21. Which neurocognitive disorder most strongly presents with early personality change and disinhibition?

    Frontotemporal neurocognitive disorder. Frontotemporal neurocognitive disorder involves degeneration of frontal and temporal lobes, leading to early behavioral changes like disinhibition before memory deficits.

22. Identify the behavioral presentation most typical of a right hemispheric stroke.

    Left hemispatial neglect and visuospatial deficits. Right hemispheric strokes commonly cause left-sided neglect and visuospatial issues due to the right brain's role in spatial awareness and attention.

23. Which clinical course best differentiates delirium from major neurocognitive disorder?

    Acute onset with fluctuating course. Delirium's acute onset and fluctuating symptoms contrast with the gradual, progressive decline typical of major neurocognitive disorders like dementia.

24. Which lobe lesion is most associated with anterograde memory impairment (new learning deficit)?

    Medial temporal lobe (hippocampal) lesion. Medial temporal lobe lesions impair consolidation of new memories because the hippocampus is essential for encoding declarative information.

25. Identify the diagnosis: fluctuating attention, disorientation, and visual hallucinations after infection.

    Delirium due to a medical condition. Delirium due to medical conditions like infection presents with acute, fluctuating symptoms from systemic physiologic disturbances affecting brain function.

Study these flashcards