Source / episode info

• **Episode:**336
• **Title:**Divine Intervention Episode 336 – USMLE Step 2CK Rapid Review Series 64 (+8/25-28 Step 2CK/3 Course Reminder).
• **Published:**2021-08-24
• Source:Episode page

One-liner

This episode provides a rapid review of high-yield topics including optic neuritis associated with MS, the differential diagnosis and management of neurodegenerative conditions (AD, CJD, WNS), complex pharmacology involving acetylcholinesterase inhibitors for various indications, and specific seizure/vascular patterns.

High-yield summary

• Optic Neuritis: Classically associated with Multiple Sclerosis (MS). Diagnosis requires MRI of the brain with IV contrast; treatment is an ophthalmologic emergency requiring IV corticosteroids to prevent permanent blindness.
• Acetylcholinesterase Inhibitors (AChEIs): Used for multiple conditions: Alzheimer's disease (Donepezil, Galantamine, Rivastigmine), Myasthenia Gravis (Pyridostigmine), and post-operative ileus/bladder overflow (Neostigmine).
• Neurodegenerative Markers: West Nile Syndrome (WNS) is associated with copper excess and low serum ceruloplasmin; Creutzfeldt-Jakob Disease (CJD) is a prion disease marked by elevated 14-3-3 protein in CSF.
• Absence Seizures: A generalized seizure type characterized on EEG by the classic "3 Hz spike and slow wave" pattern, treated with Ethosuximide.
• Organophosphate Poisoning: Presents as a cholinergic crisis (SLUDGE syndrome). Treatment involves administering an anticholinergic receptor antagonist (Atropine) followed by enzyme regeneration (Pralidoxime).

Learning objectives

• Differentiate the clinical presentation, diagnostic markers, and management of optic neuritis versus other causes of vision loss.
• Apply knowledge of acetylcholinesterase inhibitor pharmacology across various conditions (AD, MG, ileus).
• Recognize the key laboratory findings associated with neurodegenerative disorders like WNS and CJD.
• Understand the pathophysiology and treatment protocols for specific seizure types, such as absence seizures.
• Master the emergency management steps for cholinergic crises (organophosphate poisoning) and anticholinergic overdoses.

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