Opioids for chronic non-cancer pain? Which ones.....if any?

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Presentation transcript:

Opioids for chronic non-cancer pain? Which ones.....if any? Eric J. Visser Professor and Churack Chair, UNDA Specialist pain medicine physician and anaesthesiologist

Do opioids work for chronic pain? No, not that well (Level I) Especially not for LBP in < 60s NNT = 4 30% reduction in pain score (1.5/10) on average 60% adverse effects (NNH = 4); 30% stop taking them within weeks Only 30% are still taking opioids at 12M

What are the adverse effects of opioids? Classical side effects (respiratory, sedation, dizziness, nausea, constipation) Opioid-induced hyperalgesia & tolerance (pain gets worse) Endocrinopathy (testosterone, osteoporosis) Cortical changes on fMRI (cognitive, anxiety, mood, motivation) Immune suppression Increased mortality

Opioid dose escalation (over-use) Why do opioid doses increase over time? The good news..... Dose escalation is the exception rather than the rule (only in 30%) Why do doses go up?... -Chemical coping -Disease progression (neuropathic pain) or new disease -Neuro-adaptation (hyperalgesia, tolerance) -Addiction (15%) -Diversion -Prescriber practice

Selecting-out ‘poor copers’ & treating their distress with opioids Chemical coping Distress Opioids Lifestyle Dysfunction Dyscopia Chemical coping

How much is enough? ‘Ceiling dose’ 90 mg oral morphine equivalents per day is plenty! If >200 mg oral morphine/d -3 x increase overdose deaths -Premature all-cause death -Major psychosocial issues

If opioid analgesia is not working..... Opioid rotation Taper and cease 10% per fortnight

Opioid analgesia All opioid prescribing for chronic pain is an ongoing clinical trial Measure end points (function) Don’t ‘’set-and-forget’’ prescribe Review ever 3 months Only diamonds are forever, not opioids!

If opioid analgesia is not working..... It’s OK to say no and to taper and cease ‘I can’t safely prescribe this anymore’ ‘Your pain does not respond to opioid medications’ ‘Just like some infections don’t respond to antibiotics..... Some pain does not respond to pain killers’

Which opioids should we use? Tramadol 1/3rd opioid, 1/3rd nor-adrenaline, 1/3rd serotonin Good for neuropathic pain (Level I) Less addiction (S4), tolerance, hyperalgesia, withdrawal Less respiratory depression Less bowel dysfunction Can combine with some antidepressants (serotonin syndrome, 1/7000)

Tapentadol (SR) ½ opioid, ½ nor-adrenaline (no serotonin) Good for neuropathic pain and tissue injury pain (mixed pain) ½ the potency of oral morphine Less addiction (S8) Less bowel dysfunction Can combine with some antidepressants, or other opioids

Transdermal buprenorphine patch Mu partial agonist, kappa antagonist No ceiling effect for analgesia Use it like any other opioid Safer respiratory profile Safer renal profile (no accumulation) Lower dose escalation rate Better dose control....only 1 patch per week

Summary: Opioids for chronic pain They don’t ‘work’ that well: NNT = 4 (NNH = 4) (Level I) ‘Work’ better in over 60s (more side effects) Avoid in NSLBP, headache, fibromyalgia, abdominal pain (Level I) Opioid prescribing is an ongoing therapeutic trial Ceiling dose ≤90 mg oral morphine equivalents/day 3 Ts: tramadol, tapentadol SR or transdermal buprenorphine

Thank you