Source / episode info

• **Episode:**59
• **Title:**Divine Intervention Episode 59 – Neurology Clerkship Shelf Review Part 8 (Final Part)
• **Published:**2018-10-22
• Source:Episode page

One-liner

This comprehensive review covers diverse neuro topics including B12 deficiency/myelopathy, various dementia syndromes (AD, NPH), myopathies (PM/DM), toxicological emergencies (cholinergic/anticholinergic poisoning), and classic neurological exam findings like Gerstmann syndrome and the triad for brain abscess.

High-yield summary

• B12 Deficiency: Causes subacute combined degeneration affecting the dorsal columns (vibration, fine touch) and lateral corticospinal tracts (spasticity, hyperreflexia). Diagnosis involves elevated methylmalonic acid and specific testing using intrinsic factor.
• Dementia Syndromes: Normal Pressure Hydrocephalus (NPH) presents with "wacky, wet, wobbly" triad (urinary incontinence, gait disturbance, dementia) and is treated with a VP shunt to decrease ICP.
• Myopathies: Polymyositis typically causes symmetric proximal weakness; Dermatomyositis requires the presence of characteristic skin findings (e.g., Gottron's papules). Both require CK elevation for diagnosis.
• Toxin Management: Cholinergic toxicity (organophosphates, nerve gas) is treated with Atropine (M receptor blocker) and Pralidoxime (AChE regenerator); Anticholinergic toxicity (atropine overdose) causes dry mouth, constipation, and flaccid paralysis.
• Neuroanatomy/Exam: A lesion in the dominant parietal lobe leads to Gerstmann syndrome (acalculia, agraphia, left-right disorientation), while a non-dominant parietal lobe lesion typically presents with neglect.

Learning objectives

• Differentiate the clinical presentations, pathophysiology, and diagnostic workup for various types of dementia (AD, NPH, vascular).
• Recognize the classic signs and management protocols for common neurological emergencies (e.g., status epilepticus, brain abscess).
• Correlate peripheral neuropathy/myopathy findings with specific metabolic deficiencies or autoimmune processes (B12 deficiency, PM/DM).
• Master the differential diagnosis and treatment of toxicological states involving cholinergic vs. anticholinergic agents.
• Apply knowledge of neuroanatomy to interpret deficits related to parietal lobe lesions (Gerstmann syndrome vs. neglect).

Board exam buzzwords