Ch 11 - Pain Medicine: Pain Syndromes Flashcards
Description of Nociceptive/Somatic pain
Deep somatic pain: dull/aching
Superficial somatic pain: sharp, pricking
Burning, localized, reproducible
Description of Visceral pain
Crampy and dull
Vague in location
Description of Neuropathic/Central pain
Burning, tingling, shooting, stabbing, electric-like
May be associated with numbness, tingling
What is the cause of nociceptive/somatic pain?
noxious perception from tissue damage mediated by the somatic nervous system
What is the cauase of visceral pain?
Organs mediated by ANS
What is the cause of neuropathic/central pain?
Lesion or dysfunction in CNS or PNS
What is myofascial pain?
Localized and referred soft-tissue pain that can exhibit sensory, motor, and autonomic symptoms arising from myofascial trigger point
What is a myofascial trigger point?
hyperirritable point within a taut band of skeletal muscle or fascia that is painful on compression
What is Complex regional pain syndrome (CRPS)?
neuropathic pain disorder affects one or more extremities and usually occurs following a physical injury
What are the types of CRPS?
CRPS I: without nerve damage
CRPS II: nerve damage
Medications used for CRPS
NSAIDs, antidepressants, anticonvulsants, opioids (limited data), topical dimethyl sulfoxide (DMSO), and oral N-acetylcysteine (NAC)
What procedure can be useful in CRPS?
Sympathetic nerve blocks
Describe CRPS pain
Continuing pain, allodynia, or hyperalgesia in which the pain is disproportionate to any known inciting event
What can be signs of CRPS?
edema, changes in skin blood flow, or abnormal sudomotor activity in the region of pain
What is Interstitial cystitis?
Chronic inflammatory condition of the bladder’s submucosal and muscular layers
What is a Hunner’s ulcer?
Patches of broken skin on the bladder wall
Present in 10% of interstitial cystitis
Describe K+ sensitivity test
Positive if patient experiences pain with urinating K+/water vs water from bladder alone
What is first line treatment for interstitial cystitis?
Patient education
Diet modification
Stress modification
What is second line treatment for interstitial cystitis?
PT Oral medications (amitriptyline, cimetidine, hydroxyzine, pentosan polysulfate) Bladder instillations (DMSO, heparin, lidocaine)
What is third line treatment for interstitial cystitis?
Treatment of Hunner’s ulcers (laser, fulguration,
triamcinolone injection)
Hydrodistention (low pressure, short duration)
What is fourth line treatment for interstitial cystitis?
Neuromodulation (sacral or pudendal nerve)
What is fifth line treatment for interstitial cystitis?
Cyclosporine A, Botulinum toxin
What is sixth line treatment for interstitial cystitis?
Surgical intervention (urinary diversion, augmentation, cystectomy)
What is Irritable bowel syndrome (IBS)?
Abd pain or discomfort for 6 mo & at least 3x/mo for the last 3 mo w/o other cause
What are symptoms of Irritable bowel syndrome (IBS)?
Chronic abdominal pain Discomfort Bloating Urgency to move bowels Tenesmus Alteration of bowel habits Improvement of pain with bowel movement
What comorbidities are associated with Irritable bowel syndrome (IBS)?
HA
Fibromyalgia
Depression
Chronic fatigue syndrome
Tx of IBS
Diet modification
Psychotherapy
Probiotics
Oral medications (fiber supplements, laxatives) Antidiarrheals (loperamide)
Antispasmodics (hyoscine, cimetropium, pinaverium)
Antidepressants (TCAs, SSRIs), or Amitiza (lubiprostone)
What do the sacral nerves provide sensory and motor innervation to?
Anorectal region and motor innervation to the external anal sphincter and levator ani muscles
Which viscera are innervated by S1-4?
Bladder
Urethra
External genitalia
What is a Presacral neurectomy used for?
Midline chronic dysmenorrhea that is unresponsive to medical management
What is a Presacral neurectomy?
Total transection of the presacral nerves, superior hypogastric plexus, lying within the boundaries of the interiliac triangle
What is a LUNA procedure?
Under laparoscopy, uterus is anteverted with a uterine manipulator and the uterosacral ligaments, which carry nerve fibers, are identified and transected close to their cervical attachment.
What is Piriformis syndrome?
Compression or irritation of the sciatic nerve by the piriformis muscle, resulting in pain, numbness, and tingling in the buttocks that may radiate into the thigh and lower leg
What kind of pain is present in 30% of HIV patients?
Peripheral neuropathic pain
Which HIV medications can cause peripheral neuropathy?
didanosine and stavudine
What can contribute to HA in HIV patients?
Cryptococcal meningitis
Zidovudine
What can cause abdominal pain in HIV patients?
Mycobacterium avium complex [MAC] infection
What is a common first symptom of MS?
Optic neuritis
Usually resolves in 7 to 10 days
What is the most common pain syndrome in MS?
Neurogenic: dysesthesias, often occurs in legs
Lhermitte’s sign
Describe pain in peripheral vascular disease
Intermittent claudication: calf pain on exercise Critical limb ischemia: pain at rest Aching Cramping Burning in feet, calves or thighs
What is chronic pain in sickle cell disease typically secondary to?
AVN (hips > shoulders > ankles)
What can be seen on x-ray of the spine with chronic back pain in sickle cell disease?
Fish mouth appearance of spine
What is Rheumatoid arthritis?
systemic disease characterized by inflammation of the membranes lining the joints and synovium
What is the cause of pain in RA?
Synovitis
Usage related joint pain secondary to weakness
Secondary arthritis
Describe symptoms of Ankylosing Spondylitis
Pain and stiffness in SI, low back and buttock that is gradual over weeks to months
Pain unilateral, bilateral or alternating
Worse in the mornings and at night
What can improved the symptoms in Ankylosing Spondylitis (AS)?
Warm shower
Light exercise
Describe the epidemiology of Fibromyalgia patients
Female-to-male ratio of 3:1 >50 years of age Low educational level Low socioeconomic status Living in rural areas
What is the mechanism of Fibromyalgia?
CNS sensitization that leads to “disordered afferent processing” and increased levels of excitatory neurotransmitters (glutamate, substance P) and/or low levels of inhibitory neurotransmitters (5HT, NE, GABA)
What are the symptoms of Fibromyalgia?
Multifocal pain Fatigue Insomnia Cognitive or memory problems Psychological distress
How is Fibromyalgia diagnosed?
Tenderness at 11 or more of 18 specific tender point sites (pressure at 4 kg/cm2).
What are pharmacologic treatments of Fibromyalgia?
- TCAs and cyclobenzaprine shown to be efficacious in RCTs
- Pregabalin (FDA approved in 2007)
- Duloxetine (FDA approved in 2008)
- Milnacipran (FDA approved in 2009)
What are nonpharmacologic treatments of Fibromyalgia?
- Exercise
- Behavioral medicine
- Educational approaches