Neuropathy Flashcards
Definition of mononeuropathy
Lesions of individual nerve
Causes of mononeuropathies
Local trauma
Entrapment eg. tumour
Mononeuritis multiplex definition
2 or more peripheral nerves affected
Mononeuritis multiplex general cause
Tends to be systemic
Specific causes of mononeuritis multiplex
WARDS PLC
Wegener’s
Aids / Amyloid
Rheumatoid
DM
Sarcoidosis
Polyateritis nodosa
Leprosy
Carcinomatosis
Median nerve muscle innervation
LOAF
2 Lumbricals
Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis
Median nerve roots
C6-T1
Ulnar nerve roots
C7-T1
Sx of ulnar nerve neuropathy
Weakness / wasting of:
- medial wrist flexors
- interossei
- hypothenar eminence
Sensory loss over medial 1.5 fingers
Rx of ulnar nerve neuropathy
Rest
Night time soft elbow splint
Surgery
Most common cause of ulnar nerve palsy
Cubital tunnel syndrome
Most common cause of median nerve palsy
Carpal tunnel syndrome
Sx of carpal tunnel syndrome
Pain in hand worse at night
Numbess in thumb and lateral 2.5 fingers
Phalen’s test
Tinel’s test
Rx of carpal tunnel syndrome
Splinting
Local steroid injection
Decompressive surgery
Radial nerve roots
C5-T1
Sx of radial nerve neuropathy
Wrist drop
Numbness over anatomical snuffbox
Muscles innervated by radial nerve
BEST
Brachioradialis
Extensors
Supinator
Triceps
Presentation of upper brachial plexus injury
Erb’s palsy
(Waiter’s tip)
Can’t abduct arm
Can’t flex elbow
Presentation of lower brachial plexus injury
Klumpke’s palsy
(Claw hand)
Phrenic nerve roots
C3, 4, 5
Sciatic nerve roots
L4-S3
Lateral cutaneous nerve of the thigh roots
L2-L3
Lateral cutaneous nerve of the thigh neuropathy presentation
Lateral burning thigh pain
Site of Lateral cutaneous nerve of the thigh entrapment
Inguinal ligament
Common peroneal nerve roots
L4-S1
Common causes of common peroneal nerve neuropathy
Trauma to fibular head
Sitting cross legged
Common peroneal nerve palsy presentation
Foot drop
Sensory loss over dorsum of foot
Tibial nerve roots
L4-S3
Presentation of tibial nerve neuropathy
Can’t plantar flex
Can’t flex toes
Sensory loss over sole of foot
Polyneuropathy definition
Symmetrical, widespread disorder of nerves
Metabolic causes of polyneuropathy
DM
Renal failure
Hypothyroidism
Malignancy causes of polyneuropathy
Paraneoplastic syndromes
Polycythaemia rubra vera
Inflammatory causes of polyneuropathy
Guillain Barre syndrome
Sarcoidosis
Inherited causes of polyneuropathy
Charcot-Marie-Tooth syndrome
Infective causes of polyneuropathy
Leprosy
HIV
Syphillis
Lyme disease
Toxin causes of polyneuropathy
Lead poisoning
Arsenic poisoning
Drug causes of polyneuropathy
Alcohol
Isoniazid
Phenytoin
Nutritional causes of polyneuropathy
Low B1
Low B12
Low folate
DM polyneuropathy
Mostly sensory
Glove and stocking
Another name for Charcot-Marie-Tooth syndrome
Peroneal muscular atrophy
Genetics of Charcot-Marie-Tooth syndrome
Autosomal dominant
Ch 17
Presentation of Charcot-Marie-Tooth syndrome
Starts in puberty
Weak legs + foot drop
Sx of Charcot-Marie-Tooth syndrome
Peroneal muscle atrophy
Hand and arm muscle atrophy
Weak legs
Foot drop
Variable sensory loss
Classical appearance of peroneal muscle atrophy
Inverted champagne bottle appearance
Other name for Guillain Barre syndrome
Acute inflammatory demyelinating polyneuropathy
Presentation of Guillain Barre syndrome
Few weeks post infection
Symmetrical ascending muscle weakness
Progresses days-4wks
Then recovery begins
Triggers for Guillain Barre syndrome
Campylobacter jejuni
CMV
Mycoplasma
VZV
HIV
Pathology of Guillain Barre syndrome
Infection triggers antibodies which attack nerves
Sx of Guillain Barre syndrome
Ascending muscle weakness
Sweating
Tachycardia
Arrhythmias
Worry with Guillain Barre syndrome
Respiratory muscle involvement
Features required for diagnosis of Guillain Barre syndrome
Progressive weakness in all 4 limbs
Areflexia
Mx of Guillain Barre syndrome
IV immunoglobulin 5 days
Plasma exchange
No Steroids
Prognosis of Guillain Barre syndrome
85% make near complete recovery
Complete paralysis still compatible with recovery
General Mx of polyneuropathies
Rx cause
Foot care
Splint joints
IV immunoglobulin for GBS
Rx neuropathic pain
Rx of neuropathic pain
Amitriptyline
Gabapentin
Pregabalin
Types of autonomic neuropathy
Isolated sympathetic
Isolated parasympathetic
Part of generalised sensorimotor peripheral neuropathy
Sx of autonomic neuropathy
Postural hypotension
Erectile dysfunction
Sweating
Constipation
Horner’s syndrome
Causes of primary autonomic failure
Parkinson’s disease
Lewy body dementia
Causes of secondary autonomic failure
DM
Amyloidosis