Chronic pain PPT by McDizzle Flashcards
Josh Guide to mind fucking anyone and everyone on issues of chronic pain!!!!!!!! skeet skeet bitches.!!!!!!!!!!!!!!!!
What is pain?
an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage or both
what is Chronic Pain?
persistent or recurrent pain, lasting beyond the usual course of acute illness or injury, or more than 6 months, and adversely affecting the patients well-being
What are the effects of unreleived pain
Delayed healing altered immunity Increased stress anxiety or depression general physical and psychological decline Economical adversity
in a study >50% of pts had to change MDs due to lack of pain control? why is this?
- unwilling to treat pain
- did not take the pt’s pain seriously
- inadequate knowledge about pain treatment
What contributes to the lack of pain control throughout the world?
- inadequate education
- poor understanding of pain syndromes
- lack of diagnostic tools
- attitudes regarding pain
- reimbursement barriers
- inadequate treatment guidelines
- poor understanding of drugs used
- reluctance to use certain pharm agents
- lack of knowledge of complementary therapies
- drug side effects
Common barriers to treatment of Chronic Pain:
Provider related?
- limited knowledge of pain patho and assessment skills
- biases against opioid therapy and overestimation of risk
- fear of regulatory scrutiny/action
Common barriers to treatment of Chronic Pain:
Patient related?
- exaggerated fear of addiction, tolerance, SE
- reluctance to report pain: stoicsm, desire to please “MD”
- concerns about “meaning” of pain
Common barriers to treatment of Chronic Pain:
system related
- low priority given to pain and symptom control
- limits on # of RXs and refills per month
- reimbursement policies
Common barriers to treatment of Chronic Pain:
economic and racial?
- language and culture differences
- perceptions and misconceptions
- lack of assertiveness in seeking treatment
- unavailability of meds
Pathophysiology of pain:
Types of pain?
- nociceptive
- neuropathic
- idiopathic
Pathophysiology of pain:
patho of chronic pain???
-the nervous system REMODELS continuously in response to repeated pain signals —> nerves become hypERsensitive to pain & resistant to antinociceptive system
Pathophysiology of pain:
what happens if chronic pain is untreated?
pain signals will continue even after injury resolves
Pathophysiology of pain:
Chronic pain signals become embedded in the ___ _____ ______
CNS
Which type of pain is pain sensing signals are initiated in response to a stimulus they elict pain relieving responses
Acute pin
Which type of pain sends pain signals that are generated for no reason and may be intensified; pain relieving mechanisms may be defective or deactivated
Chronic Pain
nociceptive pain pain results from what?
ongoing activation of primary afferent neurons responding to noxious stimuli
nociceptive pain is consistant with what?
degree of tissue injury
nociceptive pain is described as what?
aching
squeezing
stabbing
throbbing
nociceptive pain 2 subtypes
Somatic (r/t activation of somatic afferent neurons)
Visceral (r/t activation of Visceral afferent neurons)
Somatic pain:
characteristics
well localized Continuous or intermittent aching dull gnawing nagging sharp
Somatic pain
examples
Bone fracture
arthritis
Bone metastasis
Visceral Pain:
Characteristics
poorly localized referred to distant sites Sharp gnawing vague deep pressure may become worse with movement/inhale
Visceral Pain:
examples
gallbladder
pancreatitis
Cancer
What type of pain is initiated by primary lesion in the nervous system; beleived to be sustained by aberrant somatosensory processing in the peripheral and CNS
Neuropathic pain
Neuropathic pain:
characteristics
burning shooting electrical quality aching throbbing sharp Constant or intermittant
Neuropathic pain is independent of obvious ongoing _____ activation
nociceptive
Neuropathic pain
examples
post herpatic neuralgia
diabetic neuropathy
2 subtypes of Neuropathic pain
Presumed “central generator”
Presumed “peripheral generator”
Idiopathic pain what is it?
exist in the absence of an identifiable physical or psychological pathology that could account for the pain
Idiopathic pain is uncommon in what types of pt’s
pt’s with progressive illness
What is psychogenic pain?
pain that shows positive evidence of predominant psychological contribution and may be labeled with a specific phychiatric diagnosis
Pain assessment UPQRST
U-use the pt's self report P-palliative (provocative) Q- quality R- Radiation S- Severity T-Temporal
UPQRST +2
what is the +2
2 additional questions!
- what have you tried to relieve your pain
- how is the pain affecting your life
How can you assess pain in the cognitively impaired?
Ask simple questions yes/no assess risk factors for pain Observe for non-verbal signs of pain Investigate behavior/routine changes assess function and pain attempt an analgesic trial
The WHO has a ladder that states to start treating the patient based off where their pain is level is at what are the 3 levels
mild
moderate
severe
What is pain management for mild pain?
opioids
What is pain management for Moderate pain
opioids + something else
What is pain management for severe pain (basic don;t name meds yet)
opioids + something else + something else
What is pharmacological management for mild pain
Acetaminaphen
NSAIDs
COX-2 inhibitors
LA injections
What is pharmacological management for moderate pain?
Step 1 plus step 2
( Acetaminaphen, NSAIDs, COX-2 inhibitors, LA injections)
add intermitant doses of opioids
What is pharmacological management for severe pain?
Step 1 plus step 2 plus step 3
( Acetaminaphen, NSAIDs, COX-2 inhibitors, LA injections, and intermitant doses of opioids)
add regional block, sustained release opioids
Acetaminophen
dose maximum
4000 mg/day
Acetaminophen adverse reactions are dose dependent but more susceptible in what patents?
alcoholics
Acetaminophen facts Anit-flammatory effects? adverse effects vs other non-opioids? effects on platelet fxn? Adverse effect?
minimal
fewer
none
hepatotoxicity (increased with liver disease ETOH)
NSAIDs
exert effects at the ______ and _____ levelsls
peripheral and central
NSAIDs exhibit _______, ________, and _______ effects
antipyretic
analgesic
antiflammatory
NSAIDs do or do not produce physical or psychological dependence?
do not
NSAIDs are usefull for acute and chronic pain due to a variety of causes including what?
trauma
surgery
arthritis
CA
NSAIDs ceiling dose must be monitored to avoid toxicity with a maximum dose of _______mg/day
3200
combining NSAIDs increases the potential adverse effects! what are the adverse effects of NSAIDs
hepatic dysfunction
bleeding
Gastric ulceration
renal failure
what are some drug classes used for adjuvant analgesics for neuropathic pain
Anticonvuslants antidepressents Corticosteroids Alpha-2 adrenergic agonist NMDA receptor agonist Topicals
Adjuvant analgesics: anticonculsants
what are some examples
gabapentin carbamazepine phenytoin valproate clonazepam
Adjuvant analgesics: antidepressants what class is best shown to work from evidence
tricyclics
Adjuvant analgesics: antidepressants
what classes are better tolerated than tricyclics?
SSRI and atypicals
Adjuvant analgesics: antidepressants
they are proven efficient for all types of neuropathic pain, but often preferred for what?
continuous dysesthesias
Adjuvant analgesics: antidepressants
dose for pain management?
less than antidepresssent use
Adjuvant analgesics: anticonvulsants dose for pain?
similar to anticonvulsant dose
Adjuvant analgesics: Corticosteroids
they have been shown to improve what?
pain appetite nausea malaise quality of life in Ca pt's
Adjuvant analgesics: Corticosteroids
In CA pt’s it is indicated for refractory neuropathic pain and also?
bone pain bowel obstruction capsular bone lymphedema headache
Adjuvant analgesics: Corticosteroids
in non-cancer pts it;s use is limited to what?
inflammatory conditions
Adjuvant analgesics: Corticosteroids
what are the 2 usual drugs used?
dexamethasone
prednisione
Name 6 short acting opiods
Hydrocodone/APAP Hydromorphone Morphine Oxycodone w or w/o APAP oral transmucosal fentanyl tramadol
name 4 long acting opioids
transdermal fentanyl
methadone
extended release morphine
Oxycodone CR
Advantages of long-acting opiods
fewer peaks and troughs (sustained pain releif)
dosed less often (improved adherence)
potentially improved satisfactions
Elements to consider for drug selection
severity of pain previous exposure availability pt preference renal and liver fxn cost
how do you dose to optimize effects of medications
fixed schedule around the clock vs as needed dosing, rescue doses
recomendations for by-the-clock (fixed schedule) dosing
- dose with long acting opiod plus an “asneeded” short acting opioid (usually 5-15% of total daily dose) q 2-3h PRN
- baseline dose increases 25-100% or equal to rescue dose use
- increase rescue dose as baseline dose increases
equivalent doses put dose into SC/IV/IM dose!
30 mg morphine PO
10 mg
equivalent doses put dose into SC/IV/IM dose!
4-8mg Hydromorphone
1.5 mg
equivalent doses put dose into SC/IV/IM dose!
20 mg oxycodone
none
equivalent doses put dose into SC/IV/IM dose!
20 mg methadone
10 mg
If a pt is receiving a 24hr done of 180mg PO. what is teh equivalent 24hr dose of PO hydromorphone
Morphine 30mg PO = morphine 180mg PO
——————– ———————-
hydromophone 7.5mg x
X= 45 mg PO (6-8mg PO q4)
what is the key to successful opiod therapy
titration
what is the ceiling dose for pure agonist opioids?
none
Opioid unexpected SE
resp depression depression Apnea Resp arrest Circ depression Hypotension Shock Constipation
What are expected SE of opiods
N/V Somnolence Dizziness Pruritis Headache Dry mouth Sweating
what are non pharm ways to manage pain
Lifestyle changes (weight loss) Rehab therapy Psychosocial therapies Interventional tech (TENS, Injections, surgery) Complementry therapies (massage)
How do you measure opioid outcomes?
the 4 A's Analgesia ADLs Adverse effects Aberrant drug taking (addiction)
what is an abstinence syndrome induced by administration of an antagonist or by dose reduction
physical dependence
What is the diminished drug effect from drug exposure
tolerance
2 tyoes of tolerance
associative and pharmacological
what is a disease with pharmacological, genetic, and psychosocial elements, has elements of loss of control, compulsive use, use despite harm
Addiction
what is aberrant drug-related behaviors driven by uncontrolled pain
pseudoaddiction
What pts (3) are at low risk for addiction
acute pain
Ca pain
pt’s w/o backgrounds of abuse