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Algorithm showing a stepwise approach to the assessment and investigation of a possible neuropathy. CIDP, chronic
electromyography; GBS, Guillain-Barré ... syndrome; HNPP, ... palsies; NCS, nerve ... #Diagnosis #Neurology
Causes of Neuromuscular Weakness
 • Spinal Cord: Demyelinating Disease (MS), Epidural abscess, Infarction, Syringomyelia, Tetanus, Transverse
Tumor • Motor Nerves ... Poliomyelitis, Guillain-Barre ... syndrome, Mononeuritis ... #differential #diagnosis ... #neurology
Guillain-Barre Syndrome - Summary

Acute AIDP that presents with rapidly progressive flaccid weakness

Epidemiology:
 • 1-2 cases/100,000 per
Guillain-Barre Syndrome ... • Pain: Due to nerve ... Diagnosis: • ... #diagnosis #management ... #treatment #neurology
Localizing Extraocular Movement Disorders
 • CN Ill (Oculomotor) Nerve Palsy 
 • CN IV (Trochlear) Nerve
IV (Trochlear) Nerve ... One-and-a-half Syndrome ... ophthalmology #neurology ... #differential #diagnosis ... #ocular
Lower Extremity Dermatomes and Myotomes
Reflexes: 
 • Knee - L2, L3, L4
 • Ankle - S1
• Cauda Equina Syndrome ... damage to peroneal nerve ... #Myotomes #diagnosis ... #neurology #sensory ... #motor #leg #physicalexam
NINDS Diagnostic Criteria for Guillain Barre Syndrome 
Features Required for Guillain-Barré Syndrome:
 • Progressive muscle weakness
Criteria for Guillain ... Features Required for Guillain-Barré ... signs, Cranial nerve ... BrighamMedRes #Guillain ... #neurology #neuropathy
Upper Extremity Dermatomes and Myotomes
Motor Function
Shoulder:
 • Abduction - C5,C6 (axillary)
 • Adduction - C6, C7,
Upper Extremity Dermatomes ... Carpal Tunnel Syndrome ... #Myotomes #diagnosis ... #neurology #sensory ... #motor #arm #physicalexam
Ptosis - Differential Diagnosis Framework

Ptosis (Greek- to fall) Drooping of the upper eyelid that usually results
- Differential Diagnosis ... Neurogenic Ptosis - Neurologic ... junction, cranial nerve ... eyelid: • Third nerve ... #Ptosis #neurology
Cauda Equina Syndrome Overview

Cauda Equina Syndrome:
 • Prevalence: 1:33,000-100,000 ppl/yr
 • Incidence: 1.5-3.4 million ppl/yr
 •
compression of nerve ... Differential Diagnosis ... Tethered cord • Guillain-Barre ... region (S2-S4 dermatomes ... #causes #neurology
Guillain-Barré Syndrome (GBS)
Acute autoimmune demyelinating polyradiculoneuropathy that presents with rapidly progressive flaccid weakness
Epidemiology:
 • Incidence: 1
Guillain-Barré Syndrome ... SinaiBmoreIMRes #GBS #Guillain ... #Barre #Syndrome ... #diagnosis #management ... #neurology