Neurology - Level 2 Flashcards
Investigations to perform in first fit?
o Consider alcohol/drugs, withdrawal states, hypoglycaemia, arrhythmias, head injury, SAH, TIA/stroke, infection, metabolic
o Investigations
BMG
Bloods – glucose, FBC, U&Es, cultures if pyrexial
ECG
CXR if signs
Urine pregnancy test
CT scan if:
• Focal signs, head injury, known HIV, suspected intracranial infection, bleeding disorder or conscious level does not improve
Discharge advice to patient with first fit?
Accompanied by adult if normal neurological and CV examination, ECG and electrolytes are normal
Make appointment with epilepsy specialist in coming week
Do not drive or use heavy machinery
Supervision when performing swimming/bathing
Admit patient with first fit if?
More than one seizure in day
Definition of status epilepticus?
- Continuous generalised seizure for 5 minutes or longer, or recurrent seizures one after the other without recovery in between
- Mortality and risk of permanent brain damage increase with length of attack
Risk factors of status epilepticus?
o Under 5 or elderly age
Precipitants of status epilepticus?
Cerebral infarction, trauma, CVA, metabolic disturbances, febrile seizures
Symptoms of status epilepticus?
- Tonic-clonic easy to distinguish, non-convulsive states harder to spot
Community management of status epilepticus? Drugs if over 5 minutes long
o Buccal midazolam 10mg 1st line
o Alternative: rectal diazepam 10-20mg, IV lorazepam (if IV access)
o Call ambulance if still fitting 5 minutes after medications, concerns about ABC
Initial management of status epilepticus?
o Time the seizure
o Position patient to avoid injury
o Open and maintain airway, lay in recovery position - Remove false teeth, insert Guedel/Nasopharyngeal airway
o High flow oxygen 15L/min via NRB mask + suction
o IV access and take blood (FBC, U&Es, LFTs, glucose, Ca, Mg, VBG, toxicology screen)
o Blood cultures if septic
o Check BM glucose
o Assess cardiac and respiratory function
Drug management (after 5 minutes) in status epilepticus?
o IV lorazepam 4mg slowly
o Repeat IV lorazepam after 10 minutes if seizures fail to respond or recur
Alternative: IV diazepam
If no IV access, buccal midazolam or rectal diazepam
Drug management in status epilepticus if alcohol abuse suspected?
o If alcohol abuse – IV thiamine 250mg over 30 mins
Drug management in status epilepticus if hypoglycaemic?
o Treat hypoglycaemia with 50ml of 20% dextrose (10g)
Further drug management (if fails to respond after 25 minutes)?
o Phenytoin 15-20mg/kg IVI at rate of 50mg/minute – if fails to respond after 25 minutes
Alternative diazepam infusion until seizures respond
Monitoring of status epilepticus?
- Monitor ECG and BP
- Anaesthetic help
o May need ICU and ventilation
o RSI – propofol, thiopental, miadazolam and tracheal intubation
Olfactory nerve lesion - anatomy?
olfactory cells are bipolar neurones passing through cribiform plate to olfactory bulb
Olfactory nerve lesion - symptoms?
reduced taste and smell but not to ammonia which stimulates the pain fibres carried in trigeminal nerve
Olfactory nerve lesion - causes?
Trauma, frontal lobe tumour, meningitis
Optic nerve lesion - symptoms - visual field defects?
Scotomas
Monocular blindness – MS, GCA
Bilateral blindness – methyl alcohol, tobacco, neurosyphilis
Bitemporal hemianopia – optic chiasm compression (internal carotid artery aneurysm, pituitary adenoma, craniopharyngioma)
Homonymous hemianopia (loss of same half of visual field in both eyes on opposite side of lesions e.g. right sided lesion causes loss of left side of visual field) - lesions behind optic chiasm in optic tract/lateral geniculate nucleus/optic radiations including tumour, stroke, abscess
Optic nerve lesion - symptoms - optic neuronitis?
Pain on moving eye, loss of central vision, afferent pupillary defect, papilloedema
MS, syphilis, sinusitis
Optic nerve lesion - symptoms - optic atrophy?
Pale optic discs and reduced acuity
MS, frontal tumours, Friedreich’s ataxia, syphilia, glaucoma, optic nerve compression
Optic nerve lesion - symptoms - papilloedema?
Raised ICP (tumour, abscess, encephalitis, hydrocephalus, benign intracranial hypertension)
Inflammation (optic neuritis)
Ischaemia (accelerated hypertension)
Symptoms of oculomotor nerve lesion?
- Fixed dilated pupil
- Ptosis
- Down and outward deviation of eye
Causes of oculomotor nerve lesion?
- DM
- GCA
- Syphilis
- PCA aneurysm
- Raised ICP
Symptoms of trochlear nerve lesion?
- Diplopia due to weak down and in eye movements
- Eye up and outwards
- Patient tilts head away from affected side
Causes of trochlear nerve lesion?
- Trauma to orbit
- DM
- Infarction
Symptoms of trigeminal nerve lesion?
- Reduced sensation over affected area
* Weakness of jaw clenching and side-to-side movement
Causes of trigeminal nerve lesion?
Sensory- trigeminal neuralgia, herpes, nasopharyngeal carcinoma
Motor – bulbar palsy, acoustic neuroma
Symptoms of abducens nerve lesion?
• Eye deviated medially due to unopposed action of medial rectus (LR paralysed)
Causes of abducens nerve lesion?
- MS
* Pontine CVA
Symptoms of facial nerve lesion?
- Facial weakness
• If LMN – forehead paralysed too
• If UMN – forehead spared due to crossing over of pathways
Cause of facial nerve lesion?
- LMN – Bell’s palsy, polio, otitis media, skull fracture, cerebellopontine angle tumur, parotid tumour, herpes (Ramsay hunt syndrome), Lyme disease
- UMN – stroke, tumour
Symptoms of vestibulocochlear nerve lesion?
• Unilateral sensorineural hearing loss, tinnitus
Symptoms of vestibulocochlear nerve lesion?
• Loud noise, Paget’s disease of bone, Menieres’ disease, herpes, acoustic neuroma, brainstem CVA, furosemide, aspirin
Symptoms of vagus nerve lesion?
• Palatal weakness, nasal speech, uvula moves asymmetrically (away lesion) when say ahh
Cause of vagus nerve lesion?
• Trauma, brainstem lesion, cerebellopontine angle tumour, polio, GBS
Symptoms of accessory nerve lesion?
• Weakness to sternocleidomastoid and trapezius
Causes of accessory nerve lesion?
• Trauma, brainstem lesion, cerebellopontine angle tumour, polio, GBS
Symptoms of hypoglossal nerve lesion?
- LMN lesion – wasting of ipsilateral side of tongue, fasciculations and protrusion of tongue deviates to side of lesion
- If UMN lesions – deviates away from lesion but tongue wont be wasted
Causes of hypoglossal nerve lesion?
• Polio, syringomelia TB
Lesions of cerebellopontine angle tumour?
CN 7, 8 then 10 and 9
Innervation of ulnar nerve?
- C7-T1
Pathology of ulnar nerve palsy?
- Vulnerable to elbow trauma – humeral fracture
- Most often damaged at epicondylar groove or in cubital tunnel
- Compression at wrist in Guyon’s canal
Symptoms and sign of ulnar nerve palsy?
- Weakness/Wasting of medial (ulnar side) wrist flexors
- Interossei (cannot cross fingers)
- Medial two lumbricals (claw hand) – cannot extend 4/5th fingers
- Hypothenar eminence wasting
- Sensory loss over medial 1 ½ fingers and ulnar side of hand
Management of ulnar nerve palsy?
• Rest • NSAIDs • Night-time soft elbow splinting for 6 months • Surgery Decompression Epicondylectomies
Innervation of median nerve?
• C6-T1
Definition of median nerve palsy?
- Compression of median nerve in carpal tunnel
- Carpal tunnel= bounded by carpal bones and transverse carpal ligament
- Reduction in dimensions cause pressure, ischaemia of median nerve and impairs conduction
- If continued, leads to segmental demyelination with more constant symptoms
Causes of median nerve palsy?
• Entrapment Hypothyroidism, DM, acromegaly, neoplasms, lipoma, OA, RA, amyloidosis, pregnancy, sarcoidosis • Excessive use of wrist • Tenosynovitis • Obesity
Symptoms and signs of median nerve palsy?
• Intermittent tingling, numbness or altered sensation
• Burning or pain in median nerve distribution (radial 3 ½ fingers and palm)
Worse at night and can disrupt sleep
Relieved by shaking it
• Loss of grip strength
• Atrophy of thenar eminence
Tests of median nerve palsy?
• Phalen’s Test
Flex wrist for 60s and brings on symptoms
• Tinnel’s Test
Tapping lightly over median nerve produces paraesthesia or pain in median nerve distribution
• If alternative cause:
Bloods (hypothyroidism)
US (ganglion)
Management of median nerve palsy - when to refer to specialist?
Symptoms severe or ADLs reduced
Symptoms recur following carpal tunnel surgery
Patient requests
Conservative management in primary care has failed