pain management for the medical and hematological...
TRANSCRIPT
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Pain Management for the
Medical and Hematological
Oncologist
Author: Jeff Myers MD, CCFP, MSEdProgram Head – Integrated Psychosocial, Supportive, Palliative Care Program
Odette Cancer Centre
Sunnybrook Health Sciences Centre
Assistant Professor & Associate Head
Division of Palliative Care, Dept of Family/Community Medicine
University of Toronto
*This lecture is supported by an unrestricted educational grant from Roche Canada
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30% of all cancer pts- mod/severe pain
60-90% of patients with advanced disease
Majority of advanced cancer patients have
greater than one type of pain
Can be relieved in 80-90%
Acceptable level in almost all
Incidence of Cancer Pain
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Ed
63 yo male – hormone refractory prostate CA,
several areas of bony mets (including L2, 3, 4
but not ischium, ilium, sacrum or right hip
area)
Presents to clinic with increasingly severe
right buttock pain
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Ed
Current analgesic regimen:
– Fentanyl 50 mcg/hr patch – change q72h
– Tyl #3 – 1-2 po q6h prn (uses on average
5/day when pain “severe”, unsure of benefit)
– Colace 100mg BID
– wife reluctant to support increasing patch as
her nephew is a heroin addict
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Concept of Total Pain
Domains that contribute to total pain– Physical
– Mental
– Emotional
– Social
– Spiritual
All domains must be considered to effectively manage pain
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The Pain History
Frame/word questions in ways that uncover key details
Objectivity is crucial– Important not to react or make judgments before
the story is complete
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Elements of a Comprehensive
Pain History Severity
Location
Quality/Character
– words to describe what it feels like
Duration
Pattern
Aggravating, alleviating, associated factors
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Elements of a Comprehensive
Pain History
Response to past and current analgesic
therapy– Detailed list of each medication name, impact on
pain, timing of doses, specific description of
circumstances when medication is used
If more than one pain, inquire about each
one separately
Diary or record of the pain
If appropriate, screen for abuse/addiction
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Elements of a Comprehensive
Pain History Impact on activities of daily living? Sleep?
Mood?
What is the meaning of the pain to the patient?
Fears patient/family have about analgesics?
What medications do they have at home?
How much of each medication do they have?
Who dispenses the medication?
How do they pay for medications?
How do they renew medications?
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Common Pain History Omissions
Quality of Pain – descriptor words
Radiation
Aggravating/Alleviating
Previous opioid side effects
Past Opioid Use
Screen for abuse/addiction
Details specifying impact of analgesics
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Why is it important to take a thorough
pain history and determine the
type(s) of pain the patient has?
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Why is it important to take a thorough
pain history and determine the
type(s) of pain the patient has?
The history is the key to understanding and
categorizing the patient’s pain(s) and provide
initial direction for a management plan
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Ed
C/o constant, severe right buttock pain
8/10 at rest, 10/10 with movement
deep, dull, achy in character
occasionally radiates down back of right leg
“more of a shooting feeling”
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Clinical Classification of Pain
It is essential that each cancer-related pain for
each patient be accurately classified according
to its pathophysiology in order to make the best
treatment choices using:
– Analgesics
– Adjuvant drugs
– Other analgesic modalities
Not all pain should be treated only with opioids!!
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Pain
Nociceptive Neuropathic
Somatic Visceral
Pain Classification System
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Nociceptive Pain
Pain resulting from chemical or physical
stimulation of peripheral nerve endings
(nociceptors) located in tissues
Neural pathways are intact
Can be somatic or visceral
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Nociceptive Somatic Pain
Usually well localized and non-radiating
Can be described as
achy/sharp/throbbing/gnawing/dull
Deep somatic pain
– ex: bone, muscle
Superficial somatic
– ex: skin, mucous membranes
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Nociceptive Visceral Pain
Infiltration/compression/distention/ stretching
of thoracic/abdominal viscera
More diffuse (squeezing or pressure like)
over viscera involved or referred pain
ex: bowel obstruction, liver capsule stretching
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Pain
Nociceptive Neuropathic
Somatic Visceral
Pain Classification System
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Neuropathic Pain
Caused by peripheral/CNS system injury
– Tumor compression/infiltration
– Secondary to treatment
(chemo/radiation/surgery)
Often radiates along dermatome or peripheral
nerve distributions
Burning, lancinating, pins/needles, shooting,
“feels dead or wooden”
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Types of Neuropathic Pain
Allodynia: pain due to a stimulus that normally causes no pain– pain response to light touch
Hyperalgesia: sensitivity – excruciating pain to pinprick
Dysesthesia: unpleasant abnormal sensation– burning, tingling, numbness
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Ed
C/o constant, severe right buttock pain
8/10 at rest, 10/10 with movement
deep, dull, achy in character
occasionally radiates down back of right leg
“more of a shooting feeling”
Nociceptive - Somatic
Neuropathic
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Ed
Current analgesic regimen:
– Fentanyl 50 mcg/hr patch – change q72h
– Tyl #3 – 1-2 po q6h prn (uses on average
5/day when pain “severe”, unsure of
benefit)
– Colace 100mg BID
– wife reluctant to support increasing patch
as her nephew is a heroin addict
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Ed – Objectives
Improve management of nociceptive pain
Address neuropathic pain
Address fears about opioids
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Ed – Objectives
Improve management of nociceptive pain
Address neuropathic pain
Address fears about opioids
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Ed – Manage Nociceptive Pain
Opioid Options:
1. Maximize current regimen
2. Rotate opioid (new regimen)
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Fentanyl Transdermal Oral BT form currently not available in Canada
Onset of action, time to reach steady state and
absorption highly variable
Does not allow for rapid titration
In setting of malignant pain, fentanyl only appropriate
when:
– pain is well controlled and unlikely to vary
considerably
– oral route not available**
*fentanyl contraindicated in opioid naïve patients
**do not consider when patients lose oral route due to progressed
disease/enter actively dying phase
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Opioids
Morphine
Hydromorphone
Oxycodone
Fentanyl
Codeine
Methadone
Tramadol
Buprenorphine
Meperidine (Demerol): NO ROLE IN CHRONIC/CANCER PAIN MANAGEMENT
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Opioid Preparations
MS Contin, M-
Eslon, Kadian
MS-IR, Statex
Hydromorph
Contin
Hydromorphone IR
OxyContin
Oxycocet, Percocet,
Endocet, Oxy-IR
Duragesic
Codeine Contin
Tylenol #1-4
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Opioid Cost Comparison
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WHO Ladder
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General Dosing Considerations
Educate patient and family
Investigate wisely and effectively
Do not delay TREAT immediately
Use a “pain diary” and objective measures
of pain
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General Dosing Considerations
Helpful Hints as we begin to develop an
approach:
If pain is “mild”, non-opioids (acetaminophen,
acetylsalicylic acid) should first be introduced
If pain persists, or if at presentation it is
“moderate” to “severe”, opioids should be
introduced
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General Dosing Considerations
Initially, “weak opioids” (codeine, tramadol)
should be prescribed; if “maximum” doses are
reached, the weak opioids should be rotated
to “strong opioids”
“Strong” opioids have no maximum dose!!!
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General Dosing Considerations
Continuous pain: around the clock pain =
ATC dosing
Intermittent pain: breakthrough or incident pain =
PRN dosing
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General Dosing Considerations
If ATC dosing required, the patient should
initially receive a dose of short-acting opioid
every 4 hours (T1/2 - determines dosing
interval of standing opioid)
Steady state - determines when it is safe to
make changes in dosing
– after 5 half lives
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General Dosing Considerations
“Breakthrough pain” refers to pain experienced despite around-the-clock analgesia
Cmax- determines breakthrough frequency
– 1hr po (all opioids), 20-30 min sc, 6-10 min iv
When initiating an opioid, breakthrough dose =
50% of the routine 4-hourly dose OR
10%–20% of the total daily opioid dose
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General Dosing Considerations
If pain begins to stabilize on a routine dose of
a short-acting opioid, the long-acting
equivalent of the same opioid should be
substituted
The availability of hourly breakthrough dosing
should not change
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General Dosing Considerations
Long-acting or extended-release opioids have a half-life of approximately 12 hours
Most patients should receive them twice daily
Long-acting formulations should not be used on an as-needed basis because of their delayed onset of action
In general, patients should receive the same opioid for routine and breakthrough dosing (the exception in Canada is fentanyl)
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General Dosing Considerations
With IR oral preparations: dose q4h, adjust daily
With SR oral preparations: dose q8,12,24h, may adjust daily
If unstable pain: use IR preparations, it gives you more flexibility
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Combination Preparations
Percocet, Endocet, Oxycocet
Tylenol #1,2,3,4
Daily dosing/use is limited by amount of
acetaminophen
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Ed
Current analgesic regimen:
– Fentanyl 50 mcg/hr patch – change q72h
– Tyl #3 – 1-2 po q6h prn (uses on average
5/day when pain “severe”, unsure of
benefit)
– Colace 100mg BID
– wife reluctant to support increasing patch
as her nephew is a heroin addict
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Opioid Conversion Table
Codeine Morphine Oxycodone Hydromorph Fent/Meth
PO 100mg 10mg 5mg* 2mg
SC/IV 5mg 1mg
* Disagreement as to appropriate equivalency
Fentanyl patch 25micrograms q72hours = 50mg morphine q24hours
Methadone = conversion very complicated
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1 Percocet (5mg PO oxycodone) =
10mg PO morphine = 2 mg PO hydromorphone
Side note…
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Ed
Fentanyl 50mcg/hr = Morphine 100mg q24h =
Hydromorphone 20mg q24h
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Ed
Fentanyl 50mcg/hr = Morphine 100mg q24h =
Hydromorphone 20mg q24h
Hydromorphone 3mg po q4h OR
Hydromorph Contin 9mg q12h
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Ed
Fentanyl 50mcg/hr = Morphine 100mg q24h =
Hydromorphone 20mg q24h
Hydromorphone 3mg po q4h OR
Hydromorph Contin 9mg q12h
Hydromorphone 2mg q1h prn
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What was wrong with
original breakthrough dose?
Tylenol #3 – 1-2 po q6h prn 5/day
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What was wrong with
original breakthrough dose?
Tylenol #3 – 1-2 po q6h prn 5/day
Tylenol #3 = Codeine 30mg = Morphine 3mg =
Hydromorphone 0.6 mg (1/4 of reqd)
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Ed – Objectives
Improve management of nociceptive pain
Address neuropathic pain
Address fears about opioids
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Ed – Objectives
Improve management of nociceptive pain
Address neuropathic pain
Address fears about opioids
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“But HCP…we don’t want him to
become addicted!”
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Opioid Myths
MYTH 1 – Opioids Cause Addiction
Physical dependence is an expected result of long-
term opioid treatment
SHOULD NOT BE CONFUSED WITH ADDICTION
Physical dependence = withdrawal syndrome
Addiction is a chronic neurobiologic disease with
genetic, psychosocial and environmental factors
Helpful to patients to differentiate reason for use ie
relieving physical pain versus escaping psychological
“pain”
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“But HCP…aren’t these
medications too strong for him to
be taking all the time?”
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Which of the following is the
strongest opioid?
A) fentanyl
B) hydromorphone
C) morphine
D) oxycodone
E) none of the above
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Opioid “Strength”
Patients/caregivers ask “Is this too strong?”
How do we respond?
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Opioid “Strength”
Patients/caregivers ask “Is this too strong?”
How do we respond?
Potency (opiate receptor affinity; accounts for “difference” in # of mg)
Equianalgesic dosing
Titrate to effectiveness
“All opioids are in the same category in terms of strength. Its about figuring out which one and what dose works the best for you and your pain.”
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Opioid Myths
MYTH 2 – Opioids = Rapid Tolerance
Tolerance = state of adaptation, diminished
effect of drug over time
Clinically significant tolerance is unusual
Patients with progressing disease require
increased levels of opioids to control
increased levels of pain
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Opioid Side Effects Common
– Constipation
– Nausea
– Sedation**
Less Common– Pruritus
– Hallucinations
Rare– Respiratory depression
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Ed
Current analgesic regimen:
– Fentanyl 50 mcg/hr patch – change q72h
– Tyl #3 – 1-2 po q6h prn (uses on average
5/day when pain “severe”, unsure of
benefit)
– Colace 100mg BID
– wife reluctant to support increasing patch
as her nephew is a heroin addict
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www.OncologyEducation.ca
Constipation
Prevention is the key!!!
ALL patients on routine opioids require routine medications to prevent constipation
Recent evidence suggesting no efficacy with
stool softeners (docusate)
Must have laxative – maximize Senna and, if
necessary, add Lactulose
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Constipation
No BM for three days is considered urgent
Lactulose 30 cc every two hours until BM
Bisacodyl suppositories
Enemas
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Opioid Related Nausea
Opioid induced nausea tends to be temporary
If persists: treat nausea and rule out other
causes
History of opioid related nausea suggests
patient may require prophylactic anti-emetics
– haloperidol (Haldol) 0.5 mg
– prochlorperazine (Stemetil) 10mg
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www.OncologyEducation.ca64
Opioid Side Effects:Four Management Strategies
Dose reduction of systemic opioid
Symptomatic management of the side effect Ritalin for sedation, clonazepam for myoclonus
Opioid rotation Hydromorphone better choice in renal failure
Switching route of systemic administration
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Opioid Toxicity
Drowsiness…lethargy…non-arousable...
Confusion…hallucinations…agitation…
Myoclonus…seizures
Respiratory rate decline
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Opioid Toxicity:Four Common Causes
Sepsis
Decreased pain due to:
– new adjuvant therapy
– radiotherapy
– chemotherapy
Opioid dose changes made too frequently
within 5 half-life periods
Conversion mistakes
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Ed – Objectives
Improve management of nociceptive pain Hydromorphone 3mg po q4h
Hydromorphone 2mg q1h prn
Address neuropathic pain (next module)
Address fears about opioids Wife and patient educated re: opioid safety