Pain and Addiction - Boston University Medical Campus · 2010. 9. 20. · Pain and Addiction...
Transcript of Pain and Addiction - Boston University Medical Campus · 2010. 9. 20. · Pain and Addiction...
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Pain and Addiction Clinical Challenges
CRIT Program
May 2008
Daniel P. Alford, MD, MPHAssociate Professor of Medicine
Boston University School of MedicineBoston Medical Center
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Exhibit 2: Past Year Initiation of Non-Medical Use of Prescription-type Psychopharmaceutics, Age 12 or Older: In Thousands, 1965 to 20051
0
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New
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Analgesics Tranquilizers Stimulants Sedatives
Source: SAMHSA, OAS, NSDUH data , July 2007
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Prescription Opioid Abuse
VicodinMost commonly used prescription analgesic in U.S.
Most prescribed medication of any category with >100 million scripts
9.5% 12th graders reported nonmedical use in past year (2005)
Kuehn BM. JAMA 2007SAMHSA Office of Applied Studies 2003
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Prescription Drug Abuse Drugs
Street value is dependent on several factors
• Onset of action—fast• Intensity of effect—high• Trade name > generic• Cost and availability of illicit equivalent
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Prescription Drug Abuse Physician Factors
• Four D’s• Duped
• Dated
• Dishonest
• Disabled (?)
• Medication mania• Hypertrophied enabling• Confrontation phobia
Smith DE, Seymore RB. Proc White House Conf on Prescription Drug Abuse,1980Parran T. Medical Clinics of North America 1997
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Assessing Risk of Prescription Drug “Misuse”
• Define “misuse” (versus “abuse”)• Includes
– Nonmedical use (NSDUH)– Substance Abuse, Dependence (DSM-IV)– Addiction (AAPM/APS/ASAM)– Diversion
American Psychiatric Association. DSM IV-TR, 2000Savage et al. J Pain Symptom Manage, 2003Weaver, Schnoll. J Addiction Medicine, 2007
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Physical Dependence vs. Opioid Dependence vs. Addiction
• Physical dependence• Biological adaptation• Signs and symptoms of withdrawal (e.g., pain) if opioid
is abruptly stopped
• Addiction (4 C’s)• Behavioral maladaptation• Loss of Control• Compulsive use• Continued use despite harm• Craving
• Opioid Dependence (DSM IV)• Behavioral +/- Biological
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Diagnosing Opioid Dependence* Chronic Pain Patient on Long-term Opioids
Requires 3 or more criteria occurring over 12 months
1. Tolerance – YES2. Withdrawal/Physical dependence – YES
3. Taken in larger amounts or over longer period - MAYBE4. Unsuccessful efforts to cut down or control - MAYBE5. Great deal of time spent to obtain substance - MAYBE6. Important activities given up or reduced - MAYBE7. Continued use despite harm - MAYBE
*American Psychiatric Association DSM IV-TR 2000
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Aberrant Medication Taking Behavior
• Definition– A spectrum of patient behaviors that may
reflect misuse
• Implications of behavior depends on:– Pattern– Severity
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Aberrant Medication Taking Behavior Less Likely to be Predictive of Addiction
• Complaints about need for more medication• Drug hoarding• Requesting specific pain medications• Openly acquiring similar medications from other
providers• Occasional unsanctioned dose escalation• Nonadherence to other recommendations for pain
therapy
YellowFlags
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Aberrant Medication Taking Behavior More Likely to be Predictive of Addiction
• Deterioration in functioning at work or socially• Illegal activities-selling, forging, buying from
nonmedical sources• Injection or snorting medication• Multiple episodes of “lost” or “stolen” scripts• Resistance to change therapy despite adverse
effects• Refusal to comply with random drug screens• Concurrent abuse of alcohol of illicit drugs• Use of multiple physicians and pharmacies
RedFlags
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Monitoring, Monitoring, Monitoring… “Universal Precautions”
• Contracts/Agreement form• Drug screening • Prescribe small quantities• Frequent visits• Single pharmacy• Establish a cross coverage system• Pill countsFSMB Guidelines 2004 www.fsmb.orgGourlay DL, Heit HA. Pain Medicine 2005
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Contracts/Agreements/Consents• Efficacy not well established• No standard or validated form• No evidence they are detrimental to treatment• Educational and informational• Articulates rationale and risks of treatment• Articulates monitoring and action for aberrant
medication taking behavior• Takes “pressure” off provider to make individual
decisions (Our clinic policy is…)• Prototype http://www.painedu.org
Fishman SM, Kreis PG. Clin J Pain 2002; Arnold RM et al. Am J of Medicine 2006
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Urine Toxicology Screens• Evidence of therapeutic adherence• Evidence of non-use of illicit drugs• Know limitations of test and your lab• Be careful of false negatives and positives• Talk with the patient “If I check your urine right now
will I find anything in it?”• ? Random versus scheduled• ? Supervised, temperature strips, check Cr• ? Chain-of-custody procedures
Gourlay DL, Heit HA, Caplan YH. Urine drug testing in primary care. Dispelling myths and designing strategies monograph (www.familydocs.org/files/UDTmonograph.pdf)
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Urine Toxicology Monitoring in Patients on Opioids for Chronic Pain
BEHAVIOR ISSUESYES NO TOTAL
URINE TOX POSITIVE 10 (8%) 26 (21%) 36 (29%)NEGATIVE 17 (14%) 69 (57%) 86 (71%)TOTAL 27 (22%) 95 (78%) 122
26/122 (21%) of patients had no aberrant behavioral issues BUT had abnormal drug screen
Katz NP et al. Clinical J of Pain 2002
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• 42 year old male with h/o total hip arthroplasty (THA) presented for 1st time visit with c/o hip pain.
• One year ago displaced left femoral neck fracture requiring THA with subsequent chronic hip pain.
• Pain managed by his orthopedist initially with oxycodone/acetaminophen (Percocet®) and more recently with ibuprofen.
• Recent extensive reevaluation of his hip pain was negative.
Case
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• Requested that his orthopedist prescribe something stronger like “Percocet” for his pain as the ibuprofen was ineffective.
• Told to discuss his pain management with his primary care physician (you).
• On disability since his hip surgery and lives with his wife and 2 children.
• Denies current or a history of alcohol, tobacco or drug use.
Case continued
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• Meds: Ibuprofen 800mg TID
• Walks with a limp, uses a cane, vitals normal, 6 ft, 230 lbs.
• Large well-healed scar over the left lateral thigh/hip with no tenderness or warmth over the hip, full range of motion.
• Doesn’t want to return to his orthopedist because “he doesn’t believe that I am still in pain.”
Case continued
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• In summary, 42 yo man on disability with chronic hip pain who is requesting “Percocet”.
• Is his pain real?
• Is he drug seeking?
• Should you prescribe opioid analgesics?
• If so, what are your (and the patients) goals?
Case continued
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Is the patient’s pain “real”?
• There are no “pain meters”• Vital signs are not reliable• Pain is subjective to the patient• Pain is subjective to the examiner• There is no way on the first visit(s) to
know for certain if the patient’s pain is real or not
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Nervous System Plasticity
• The nervous system not “hard-wired”
• The nervous system is dynamic
• Painful stimuli → changes in anatomy, chemistry, physiology and gene expression
• Loss of axons induces changes in adjacent neurons that survive
• Changes may be permanent
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Is the patient “drug seeking?”
• Directed or concerted efforts to obtain medication
• It is difficult to distinguish…
…inappropriate drug-seeking from…
…appropriate pain relief-seeking
Vukmir RB. Am J Drug Alcohol Abuse. 2004
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When Are Opioids Indicated?• Pain is moderate to severe
• Pain has significant impact on function
• Pain has significant impact on quality of life
• Non-opioid pharmacotherapy has been tried and failed
• Patient agreeable to have opioid use closely monitored (e.g. pill counts, urine screens)
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Opioid Efficacy in Chronic Pain• Most literature surveys & uncontrolled case series• RCTs are short duration <4 months with small
sample sizes <300 pts• Mostly pharmaceutical company sponsored• Pain relief modest
– Some statistically significant, others trend towards benefit– One meta-analysis decrease of 14 points on 100 point scale
• Limited or no functional improvement
Balantyne JC, Mao J. NEJM 2003 Martell BA et al. Ann Intern Med 2007; Eisenberg E et al. JAMA. 2005
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Opiophobia
• Overestimate potency and duration of action
• Fear of being scammed
• Often prescribed with too small a dose and too long a dosing interval
• Exaggerated fear of addiction potential
Morgan, J. Adv Alcohol Subst Abuse, 1985
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Addiction Risk• Published rates of abuse and/or addiction in chronic pain
populations are 3-19%• Suggests that known risk factors for abuse or addiction in
the general population would be good predictors for problematic prescription opioid use– Past cocaine use, h/o alcohol or cannabis use1
– Lifetime history of substance use disorder2
– Family history of substance abuse, a history of legal problems and drug and alcohol abuse3
– Heavy tobacco use4
– History of severe depression or anxiety4
1 Ives T et al. BMC Health Services Research 2006 2 Reid MC et al JGIM 2002 3 Michna E el al. JPSM 2004 4Akbik H et al. JPSM 2006
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Setting Goals: the Four A’s• Analgesia• Activities of daily living• avoid Adverse events• avoid Aberrant drug-related behaviors
• Affect
Passik SD et al. Clin Ther. 2004
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1 month later
• He is currently taking Percocet 1 tablet every 6 hours (120/month) as you prescribed.
• He rates his pain as “15” out of 10 all the time and describes no improvement in function.
• Should you increase his dose of Percocet?
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Opioid Responsiveness (Resistance)
Analgesia Dose limiting Toxicity
• Opioids don’t relieve pain in up to 40% of patients• Opioid responsiveness varies
• Acute > Chronic• Nociceptive > Neuropathic
Pain
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Pseudo-opioid-resistance
• Some patients with adequate pain relief believe it is not in their best interest to report pain relief– Fear that care would be reduced
– Fear that physician may decrease efforts to diagnose problem
Evers GC. Support Care Cancer. 1997
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Case continued
• Transition to sustained release morphine and signed controlled substance agreement.
• After a stable period of several months, he surprises you by presenting without an appointment requesting an an early refill.
• Is he addicted?
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Aberrant Medication Taking Behaviors Differential Diagnosis
• Inadequate analgesia – “Pseudoaddiction”1
– Disease progression– Opioid resistant pain (or pseudo-resistance)2
– Withdrawal mediated pain– Opioid-induced hyperalgesia3
• Addiction• Opioid analgesic tolerance3
• Self-medication of psychiatric and physical symptoms other than pain
• Criminal intent - diversion
1 Weissman DE, Haddox JD. 1989; 2 Evers GC. 1997; 3 Chang C et al 2007
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Pseudo-addiction
• Patients with severe unrelieved pain• Intensely focused on obtaining relief
• Mimics aspects of addiction
• Behavior should resolve when adequate pain relief is provided, without evidence of loss of control, escalation, binging, etc.
Weissman DE, Haddox JD. Pain.1989
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Withdrawal Mediated PainW
ithdr
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Pain Pain Pain Pain
Com
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opioid opioid opioid opioid
Opi
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Con
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Approaching Patient with Aberrant Drug-taking Behavior
• Non-judgmental stance
• Use open-ended questions
• State your concerns about the behavior
• Examine the patient for signs of flexibility– More focused on specific opioid or pain relief
• Approach as if they have a relative, if not absolute, contraindication to controlled drugs
Passik SD, Kirsh KL. J Supportive Oncology 2005
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Stopping Opioid Analgesics
• Patient is not improving and may have opioid- resistant pain
• Some patients experience improvement in function and pain control when chronic opioids are stopped
• Patient may have a new problem – “opioid dependence (addiction)” and may need substance abuse treatment
• Be clear that you will continue to work on pain management using non-opioid therapy
• Taper patient slowly to prevent opioid withdrawal
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Discussing Lack of Benefit• Stress how much you believe / empathize with
patient’s pain severity and impact.• Express frustration re: lack of good pill to fix it.• Focus on patient’s strengths.• Encourage therapies for “coping with” pain.• Show commitment to continue caring about
patient and pain, even without opioid rx. Schedule close follow-ups during and after taper.
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Discussing Possible Addiction
• Explain why aberrant behaviors raises your concern for possible addiction.
• Benefits no longer outweighing risks. – “I cannot responsibly continue prescribing
opioids as I feel it would cause you more harm than good.”
• Always offer referral to addiction treatment.• Stay 100% in “Benefit/Risk of Med” mindset.
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Opioid Agonist Treatment and Pain
Patients who are physically dependent on opioids (ie. methadone, buprenorphine) must be maintained on daily equivalence (“opioid debt”) before ANY analgesic effect is realized with opioids used for acute pain management
Alford DP, Compton P, Samet JH. Ann Intern Med 2006
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Summary• The use of opioid analgesic therapy requires
careful assessment and tailored monitoring approaches
• Diagnosing addiction during pain management is difficult and requires careful monitoring
• Usual substance abuse risk factors probably apply to prescription opioid abuse
• Manage addiction by tapering opioids and referring to substance abuse treatment
• For patients on Opioid Agonist Treatment, treat “opioid debt” along with treating pain