Persistent and Neuropathic Pain Syndromes Flashcards
what superficial receptors pick up the sensation of pain
nociceptors
on what afferents does fast, acute, well-localized pain travel to the spinal cord
A-delta
on what afferents does slow, chronic, dull, burning, aching, and poorly localized pain travel to the spinal cord
c-afferents
what are the two components of the anterolatearl spinothalamic tract that carry pain sensation to the thalamus
neospinothalamic
paleospinothalamic
what tract does fast pain travel
neospinothalamic tract
where does information from neospinothalamic tract go and what does it detect
- goes to primary sensory cortex
- detects location and intensity of pain sensation
what tract does slow pain travel
paleospinothalamic tract
where does information from paleospinothalamic tract go and what does it detect
- goes to the reticular formation, amygdala, and cingulate gyrus
- results in affective, motivational and autonomic responses to pain sensation
the ascending pain information on the ALS is transmitting what
a DANGER signal, NOT a pain signal itself
what is pain
a perception of danger signals
what 3 components make up the pain neuromatrix
cognition
body
emotion
describe the two ways in which pain can be modulated
- closing the gate: perception of pain may be modulated by neurotransmitters released by interneurons in the spine by activation of the pain gate – application of heat, cold, massage, or TENS provides stimulus for local modulation
- descending opioid pathways: central modulation of pain occurs when the descending opioid pathway is stimulated resulting in release of pain inhibiting neurotransmitters such as endorphins, enkephalins, beta-endorphins
associated with tissue damage, usually sudden and may be severe; produces a physiological response; should gradually disappear with removal of physical stimulus or as tissue heals
acute pain
persistent pain that adversely affects a pt’s well-being, function, or quality of life; associated with increased rates of depression, suicidal tendencies
chronic pain
how long does pain have to present for to be considered chronic pain
longer than 3-6 months –> which is past the expected tissue healing time
aberrant somatosensory processing in CNS/PNS; associated with peripheral neuropathies, SCI, post-stroke, MS, thalamic injury; presenting as shooting, burning pain, numbness, altered sensation
neuropathic pain
pain descriptors for muscle pain
cramping, dull, aching
pain descriptors for nerve root pain
sharp, shooting
pain descriptors for nerve pain
sharp, lightening-like, electric
pain descriptors for sympathetic nerve pain
burning, pressure, stinging, aching
pain descriptors for bone pain
deep, nagging, dull
pain descriptors for fracture
sharp, severe, intolerable
pain descriptors for vascular pain
throbbing, diffuse
receptors at site of injury become increasingly responsive or threshold for noxious stimulus decreases
peripheral sensitization
what is associated with peripheral sensitization
hyperalgesia
prolonged peripheral inflammation or inflammation in the CNS results in increased excitability in the dorsal horn and decreased inhibition via descending pathway
central sensitization
what is associated with central sensitization
allodynia
what should you screen for in patients with chronic pain
depression!!
list common persistent pain conditions
arthritis (OA and RA)
headache/migraine
persistent neck/back pain/spinal stenosis
neuralgias
peripheral neuropathies
CRPS (SHS and RSD)
myofascial pain syndrome
fibromyalgia
cancer related pain
postoperative pain
thalamic pain syndrome
pain associated with stroke, MS, SCI
what are the 3 types of headaches/headache syndromes
primary HA
secondary HA
cranial neuralgias and primary facial pain conditions
what are the 4 types of primary HA
migraine
tension
trigeminal autonomic cephalgias (TCA)
other primary headache disorders
caused by CNS excitability in nerve fibers within wall of brain blood vessels and also trigeminal N
migraine
what is the most common type of HA
tension
usually self-managed but may become chronic if occurring more than 12 days/year
tension HA
what causes tension HA
sensitization of peripheral nerves in pericranial myofascial areas
what causes trigeminal autonomic cephalgias (TACs)
excessive stimulus of trigeminal complex
how many types of trigeminal autonomic cephalgias are there and what is the most common
4
cluster headache
rare but extremely painful, excruciating pain on one side of the head around/behind the eye; may be episodic or chronic; occurs in cycles across lifespan following circadian rhythms and seasonal changes; prevalent in men 20-40 y/o and occurs in early morning
trigeminal autonomic cephalgias
occur as a result of an underlying pathology and would signal a red/orange flag
secondary HA
examples of causes of secondary HA
subdural hematoma, subarchnoid hemorrhage, increased ICP secondary to TBI/concussion, meningitis, brain abscess, CNS conditions, cerebral neoplasms, toxicity, sinusitis, otitis media
referred from cervical zygopophyseal joints or intervertebral discs in the neck and perceived as head/face pain
cerviogenic HA
what nuclei are involved with cervicogenic HA
C1-3
signs and sx of cervicogenic HA overlap with
migraine without aura and tension-type HA
s/s that are different from migraine with cerviogenic headache
reduced C/s PROM/AROM
may have arm pain
can reduce sx with palpation/motion
what can be used to measure the impact of cerviogenic HA
NDI (neck disability index)
irritation to CN V causing severe facial pain and spasms; sharp knife-like pain lasting < 2 minutes with multiple attacks a day; “lightning bolt” pain sensation; pain may follow distribution of N branches
trigeminal neuralgia (tic doulourex)
what are the 3 branches of the trigeminal N
opthalamic
maxillary
mandibular
causes of trigeminal neuralgia
- N irritation due to contact of healthy artery/vein against trigeminal N (increased pressure causing abnormal firing; due to trauma increasing pressure; herpes zoster virus causing inflammation)
- demyelination of CN 5 (MS)
- many unknown causes
how to diagnosis trigeminal neuralgia
neuro exam
MRI
no special tests - dx of exclusion
triggers for trigeminal neuralgia
touching skin lightly
shaving
brushing teeth
blowing nose
drinking hot/cold beverages
applying makeup
smiling
talking
there are a lot of unknown triggers and can often have multiple triggers
treatment trigeminal neuralgia
- pharmalogical: anticonvulstants (carbamazepine, phenytoin); muscle relaxant (balcofen); gabapentin (anticonvulsand but used for neuropathy/pain)
- surgical: microvascular decompression, percutaneous sterotactic rhizotomy, percutaneous balloon compression; stereotactic radiosurgery
- PT: education, biofeedback to help reduce pain, relaxation techniques, neurodynamics, r/o other causes (TMJ, HA, dental issues)
when can peripheral neuropathy occur
when there is disease or injury to somatic, cranial or autonomic nerves
when does central neuropathy occur
after stroke, spinal cord injury, in MS or other CNS disorder
how is neuropathic pain described
shooting, burning, numbness, alterations in sensation and paresthesia that are often hard to describe
what are some risk factors of developing persistent pain conditions
- genetic factors for central sensitization
- comorbid conditions (migraine, fibromyalgia, CRPS, persistent LBP, IBS, chronic tension HA, TMJ disorder, depression, pain disorder, PTSD, pelvic pain, TN)
- W > M
- psychosocial h/o trauma, abuse, stress, poor coping skills
- lack of social support, limited access to preventative care
- stress
- smoking, alcohol and drunk addiction, obesity/overweight
- nutritional contributions from lack of vitamin D and b-vitamin
what is a specific scale that can be used for neuropathic pain
Leads Assessment of Neuropathic Symptoms and Signs
LANSS
how to diagnose persistent pain conditions
no specific imaging/lab tests
dx by exclusion
OTC for persistent pain conditions
acetaminophen
NSAIDs for persistent pain conditions
naproxen, ibuprofen
topical for persistent pain conditions
capsaicin, lidocaine, salsalate, menthol
antidepressants for persistent pain conditions
amitriphyline, tricyclics
anticonvulsants for persistent pain conditions
gabapentin, cyclobenzaprine
muscle relaxants for persistent pain conditions
balcofen, cyclobenzaprine
weak opiates for persistent pain conditions
tramadol
strong opiates for persistent pain conditions
codeine, hydrocodone, morpine, fentanyl patch
general principles for persistent pain management
- improve ability to cope with pain
- teach non-pharmalocigal management techniques
- increase physical strength, endurance, mobility, independence
- improve sleep
- teach proper body mechanics
- increase social, recreational activities
- enhance vocational opportunities
- teach why they are having pain
PT interventions for persistent pain
- graded exercise, aerobic conditioning, functional-based activities
- manual therapy (soft tissue, trigger point)
- neuromuscular reeducation (EMG biofeedback, diaphragmatic breathing, PNF)
- AD
- physical agents
- complementary approaches (yoga, tia chi, acupuncture, dry needling, mind-body therapies)
- pain education