Headaches Flashcards
name 4 red flags
- new onset >55
- known or previous malignancy
- early morning headache
- exacerbation by valsalva
are migraines more common in male or females
female
how long can migraines last
4-72 hours
outline the IHS criteria for migraine with/out aura
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outline the pathophysiology of migraines
Primarily neural influences, the old theory was based around vascular but this is less used now
- defects in the neurons (possibly inherited) means they are hyper excitable - they depolarise more easily and there is increased activity
- CNV1 is particularly effected - are activated and release neurotransmitters - neurogenic inflammation
- CGRP stimulate mast cells which release histamine, this produces an inflammatory reaction and formation of NO, which in turn leads to vasodilation.
- neurogenic inflam causes pain and swelling over brain covering, and sensitize nerve fibres so that previously innocious stimuli is found to be painful/uncomfortable (eg light, sound, pulsating vessels (throbbing character)
what is responsible for the increased sensitivity to light and sound etc in migraines
senstization of trigeminal neurons and brainstem pain pathways makes otherwise innocuous sensory stimuli (eg CSF pulsation and head movement) painful and light and sound are perceived as uncomfortable
when do migraines usually develop
around puberty, with increasing prevalence into teh 4th decade
describe the character of migraines, and what makes the better/worse
pulsating and unilateral. moderate to severe pain
made worse by routine physical activity eg walking
typically relieved by lying down in a darkened room
what featurs are migraines assoicated with
Nausea and vomiting
Photophobia, phonophobia
There may be allodynia (eg cant brush hair, wear glasses, earrings)
preferred patient setting during migraine
quiet, darkened room
what 3 forms does a migraine aura usually take
visual, sensory or speech disturbance
are all fully reversible
migraine prodrome
- Precedes headaches by hours/days
- Yawning, cravings, mood/sleep change
migraine triggers
- Chocolate
- hangovers
- orgasms
- cheese
- OCP
- hormonal factors for women, eg menstrual migraine just before menses
- lie ins
- too much/little sleep
- alcohol
- tumult
- exercise
migraine with aura
- focal neurological symptoms immediately preceding headache in some/all attacks
- Visual aura is the most common type: shimmering, teichopsia (zig-zag lines), fragmentation of image, patches of loss of vision.
- Positive sensory symptoms (mainly tingling), dysphasia and rarely loss of motor function may also occur following visual symptoms
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acephalic migraine
migraine aura without headache
what is acephalic migraine often misidagnosed as
TIA - can get senory and motor problems as wel as visual
first line acute medication for migraine
NSAID ± anti emetic
- only 25% achieve complete pain relief
- less chance of medication misuse headache
2nd line acute treatment of migraines
- triptans - 5HT agonists
- several methods of administration
- subcutaenous sumatriptan is good if patient eg vomiting
acute management of migraines: when to take NSAIDs adn triptans
take NSAIDs ASAP, take triptans at start of headache (not aura)
what triptan is good if the patient is vomiting
sumatriptan canbe given subcutaneously
which triptan is good for sustained relief
fovatriptan
when would you consider migraine prophylaxis
patient having >3 attacks/month or if they are very severe
how long must each migraine prophylaxis drug be trialed for
minimum of 4 months
first line migraine prophylaxis drugs
- beta blockers
- topiramate
- amitriptyline
topiramate AE
- weight loss, paraesthesia, impaired concentration, enzyme inducer, short term memory decrease
topiramate and contraception
topiramate is an AED that induces hepatic enzymes (in epilepsy higher doses are used)
- OCP needs a higher dose as its efficacy is decreased
- progesterone only methods cant be used
- can use copper IUD - normal or emergency
- can use Leveonelle within 72 hours of UPSI
- cant use ellaOne
is topiramate teratogenic?
yes, higher risk of congenital abnormalities eg cleft lip and palate
basilar migraine
- usually presents with symptoms of vertebrobasilar insufficiency (dizziness, vertigo) then headache
- may also have ataxia, tinnitus, decreased hearing , n and v
retinal migraine
transient unilateral visual disturbance withb minimal or no headache
ophthalmoplegic migraine
- transient migraine
- followed by periorbital pain and diplopia secondary to cranial neuropathies a few days later (and pupillary abnormalities and ptosis if CNIII involved)
hemiplegic migraine
- recurrent headaches assoicated with temporary unlateral hemiparesis/hemiplegia
- may have accompanying ipsilateral numbness or tingling
- speech distrubance
which gene defect is the familial form of hemiplegic migraine due to
SCN1A
are migraines uni or bi lateral?
unilateral
tension type headache
bilateral, non-pulsatile (tight band sensation) headache, pressure behind eyes
severity of TTH pain
mild to moderate
what other features does TTH have
- non-pulsatile - tight band
- relatively featureless - no nause and vomiting, no phono or photo phobia
what psychiatric disorders are TTH strongly associated with
anxiety and depression
management of TTH
- simple analgesics
- physical treatments and stress relief: massage, ice packs
- tricyclics: amitryptyline, dothiepin
what are the trigeminal autonomic cephalgias
- unilateral headaches in the distribution of CNV1, that are associated with ipsilateral autonomic features (eg ptosis, miosis, nasal stuffiness etc)
epidemiology of cluster headaches
common in young people, men>women
more common in smokers
features of cluster headaches
- excruciating unilateral retro-orbita pain
- redness and tearing of eye
- nasal congestion
- facial flushing
- lid swelling
- transient Horner’s syndrome
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how does patient act during cluster headaches
terribel pain, patient prefers to rock or move about
timing and duration of cluster headaches attacks
- attacks are shorter than migraines (30-90 minutes)
- may occur several times per day
- often at night or v early in the morning
- cluster bout can last for weeks to months, and can recur after a year or so
acute treatment of cluster headaches
- analgesics are unhelpful
- high flow oxygen for 20 min and subcut sumatriptan
prophylactic treatment of cluster headaches
verapamil, lithium and/or short course of steriods
which age group are paroxysmal hemicranias seen in
elderly females
features of paroxysmal hemicranias
- severe unilateral throbbing headache
- pain goes in, around or behind eye. occasionally can reach towards back of neck
paroxysmal hemicranias attacks
- briefer (10-30 min) and more frequent than cluster headaches
- do not occur in clusters
management of paroxysmal hemicranias
rapid and complete response to indomethacin - diagnostic
sunct
short lived (20 seconds), unilateral, neuralgia form headache, conjunctival injection (red eye), tearing
treatment of SUNCT
lamotrigine (anti convulsant) and gabapentin
what is sunct often misidagnosed as, and how would you differentiate it
trigeminal neuralgia - sunct has autonomic features such as red eye and tearing
TN will have inceased sensitivity and pain in CNV1 distribution
primary cough headache
sudden sharp head pain on coughing
what must be ruled out with primary cough headache
intracranial pathology
management of primary cough headache
indomethacin, lumbar puncture removal of CSF
new onset unilateral cranial autonomic features require imaging: MRI brain and MR angiogram.
who is trigeminal neuralgia usually seen in
elderly women
which CNV branch does trigeminal neuralgia usually invovle
2/3, tends to start in 3 and can spread
decribe trigeminal neuralgia pain
sharp, severe, stabbing, unilateral
duration and frequency of trigeminal neuralgia
1-90sec, 10-100/day
often spontaneous remission
what can trigger trigeminal neuralgia
swallowing, chewing, touching, talking
what is the main risk factor for trigeminal neuralgia
hypertension - compresion of CNV near the pons by an ectatic loop (dilated)
secondary causes of trigeminal neuralgia
tumour compressing nerve root, MS, zoster, skull base malformation
young patient with bilateral trigeminal neuralgia?
think MS
management of trigeminal neuralgia
- carbamazepine reduces the severity of attacks int the majority of cases
- gabapentin, phenytoin, baclogen
- surgery: ablation or decompression - high risk
what investigation must be performed for trigeminal neuralgia
MRI to exclude secondary causes
medication misuse headache - which are the top 3 causes
A common reason for an episodic headache becoming a chronic headache is medication misuse. The culprits are mixed analgesics (paracetamol + codeine/opiates), ergotamine and triptans. Limit OTC analgesia (no more than 6 days/month).
This is why NSAIDs are first line over triptans
what is the timeframe for the definiton of a medication misuse headache
has to last 15 days, and have started/wrosened when pt on regular medication
must improve within 2month sof stopping medication