Muscle Pain Sally Kendall Parker Institute SK 2004
Dec 15, 2015
Muscle PainSally Kendall
Parker Institute SK 2004
Muscle pain
• 15% of adult population report chronic pain in the musculoskeletal system DIKE Danish Health and Morbidity Survey 1994
• 10% adult US population widespread pain, 20% chronic regional pain Wolfe et al J Rheumatology 1997
FM Prevalence: ”The end of the continuum?”
tenderness
%
2-4%
population
Clauw 2001
Fibromyalgia
•What is fibromyalgia?
•How do we diagnose fibromyalgia?
•What causes fibromyalgia?
•What is the frequency of FM?
•How can we treat FM?
What is fibromyalgia?
•Painful, non-articular condition involving muscles
•Widespread musculoskeletal pain
•Associated with fatigue, non-refreshing sleep
•May be part of a wider syndrome
Important symptoms in fibromyalgia
• Muscle pain
• Decreased endurance
• Fatigue and
• Poor sleep
• ”Exercise” intolerance
How do we diagnose fibromyalgia?
ACR-1990 Criteria: History of widespread pain
•Pain in both sides of the body
•Pain above and below the waist
•Axial skeletal pain
•Present for at least three months
Wolfe F. et al.Arthritis&Rheumatism, 1990
Digital palpation
Approximate force of 4 kg
A tenderpoint has to be painful
at palpation
not just ”tender”
ACR-1990
Fib.Reum.Klin.BDS
Pain in 11 of 18 tender points
• Suboccipital muscle insertions
• Anterior aspects of lig. intertransverse C5-C7
• Midpoint of the upper border of mm. Trapezius
• Supraspinatus at origins above the scapula
• Second rib - costochondrale junction
• 2 cm distal to the laterale epikondyles
• The upper outer quadrats of buttocks
• Posterior to the trochanteric prominence
• Mediale fat pad proximal to the joint line
What causes fibromyalgia?
Fibromyalgia is a syndrome!
• Predisposition
• Key events
• Mechanisms
Predisposition
• Polygenic predisposition + environment
Key events
• Infections• Physical trauma*• Psychological stress• Hormonal dysfunction• Drugs• Catastrophes*
• *Events perceived as stressful
Mechanisms
• Muscle Pain• Lund et al Scand J Rheumatol 2003 32 138-45
• Nørregaard et al Clin Physiol 1994 14 159-67
• Lund et al Scand J Rheumatol 1986 15 165-173
• Sensory processing
• Autonomic dysfunction• Backman et al Acta Neurol Scand 1988 77 187-91
• Neuroendocrine dysfunction • Væroy et al Pain 1988 21-26
• Russell et al Arthritis Rheum 1994 37:1593-601
Muscle Pain
Smerter-en lærebog 2003
From Smerte En Lærebog: Graven-Nielsen et al 1997
Referred pain
Sensory processing
• Interaction between ascending and descending pathways
• Evidence for abnormal central processing of noxious stimuli at cortical and sub-cortical levels leading to allodynia and hyperalgesia
•Mountz et al Arthritis Rheum 199538: 926-38•Lautenbacher & Rollman Clin J Pain 1997 13 189-96•Kosek et al Pain 1996 2-3 375-83•Bendtsen et al Arthritis Rheum 1997 40 98-102•Gracely et al Arthritis Rheum 2002 36: 1333-43
Allodynia
Hyperalgesia
Autonomic dysfunction
• Heart rate variability
• Impaired Stress response: noradrenaline and adrenaline
Petzke & Clauw Curr Rheumatol Rep 2000 2: 116-23 review
Neuroendocrine dysfunction
• Serotonin: low in blood• Substance P: CSF • Nerve growth factor: CSF • Dynorfin: CSF
• Probably NOT causes
What is the frequency of FM?
•Prevalence in the community: 1-3%
•Primary healthcare 2-6%
•Rheumatology practices up to 20%
•80-90% women
Prevalence: ”The end of the continuum?”
tenderness
%
2-4%
population
Clauw 2001
Age curve
FM och multi-symptomillnesses
• Overlap! FM 2-4%
Chronic Fatigue Syndrome 1%
multiple chemical sensitivity
exposure syndromes f.eks Gulf War syndrom, silicon breast implanter, sick building syndrome
Somatoform disorders 4%
Clauw 2001
Overlap!
• Chronic Fatigue Syndrome 21-80%• Irritabel Bowel Syndrome 32-80%• Temporomandibular Disorder 75%• Tension/Migraine Headache 10-80%• Multiple Chemical Sensitivities 33-55%• Interstitial Cystitis 13-21%• Chronic Pelvic Pain 18%
Aaron & Buchvald Best Practice & Res 2003 17: 563-74
Important symptoms in fibromyalgia patients: 2
• Depression1,2 2-34%
• Anxiety2 27%
1 Krag et al Acta Psychiatr Scand 1994 89 370-5
2.Epstein et al Psychomatics 1999 40 57-63
• Most experimental evidence against pain response bias by hypervigilance BUT psychological factors alter pain reporting and pain behaviour
Villemure & Bushnell Pain 2002 95: 195-9
Petzke et al J Rheumatol 2003 30:567-74
What treatment is available?
•Physical therapy
•Education and cognitive restructuring
•Multidisciplinary long-term treatment
•Myofascial therapy
•Aerobic exercise
•Drugs
Analgesia tAnalgesia targets
• Peripheral pain generators• Central pain processes
• Windup: an increase in pain sensation with time when given repetitive painful stimuli
• Temporal summation: the additive feeling of pain unpleasantness when painful stimuli continue
• NMDA receptor: important role in central sensitization
• DNIC: a system that sends inhibitory signals from the brain stem to the spinal cord => inhibits or filters out ascending pain signals
Rao Rheum Dis Clin NA 2003
The Dorsal Horn
• Paracetamol vs anti inflammatory drugsParacetamol vs anti inflammatory drugs
self-rated effectivenessself-rated effectiveness
0
5
10
15
20
25
30
35
40
45
%
muchworse
worse same better muchbetter
N=1042
Wolfe et al, Arthritis Rheum 2000 43: 378-385
Tramadol
• Rationale• opioid μ receptor binding + monoamine reuptake inhibition
• RCTRussell et al, A&R 1997 40:S117EffectiveBiasi et al, Int J Clin Pharm 1998 XV111 13-19 pain
• Clinical useBennett et al, Am J Med 2003 114:537-545Combination with paracetamol effective
Opioids
• Rationale
Act on ascending and descending pathways
• Fentanyl Staud et al Pain 2002 95:195-9 single
dose inhibits wind up
OpioidsOpioids
• Little FM data• Problems with side effects and addiction issues• Which aspects of pain processing and experience
are the target?
Fillingim Pain 2003 105: 385-6
Staud et al Pain 2002 95:195-9
Meta-analysis tricyclicsMeta-analysis tricyclics
• Rationale increase CNS concentrations by blocking 5-HT- and/or NA-mediated
neurotransmission, antihistamine and anticholinergic effects • 9 TCA studies
» 16 14 PBO controlled [5 insufficient data]
• Duration» 3-26 weeks [1 >12 weeks]
Arnold et al Psychosomatics 2000 41:104-113
Meta-analysis tricyclicsMeta-analysis tricyclics
• Sample size» 9-98 /group
• Effect size» Moderate overall» Best on sleep / less on pain
• Response» 35-37%
Fib.Reum.Klin.BDS
Comparison Between Fibromyalgia and Depression
Patients with FM had more tender points (16,5) than depressed patients (1,3)
Fassbender et al Clin Rheum 1997
SSRIsSSRIs
• Rationale 5-HT reuptake inhibition
• Fluoxetine Wolfe et al, Scan J Rheum, 1994 23:255-259
no efficacy cf PBO
Goldenberg et al, A&R 1996 39:1852-1859
Ami + Fluox improvements cf monotherapy/PBO
• Citalopram (most selective)
Norregaard et al, Pain 1995 61:445-449
No efficacy cf PBO
Anderberg et al, Eur J Pain 2000 4:27-35 depressive symptoms No other efficacy cf PBO
Pain transmission modulators:Pain transmission modulators:SSRIsSSRIs
• SertralineAlberts et al, A&R 1998 41:S259 pain threshold
Celiker et al ACR 2000
Ser 50mg/d compared to Ami 25mg/d
Both pain,fatigue,sleep disturbance,stiffness, tender point count
FluvoxamineNishikai et al, J Rheum 2003 30:1124-25
As effective as Ami pain
NA/5HT reuptake blockersNA/5HT reuptake blockers
• VenlaxafineDwight et al, Psychosomatics 1998, 39:14-17
6/11 improved 50% in 55%
small numbers, open study, max. tolerated dosage
Sayar et al J Psychosomatic Res 2003 55:147-8
Pain, function, depression, anxiety improved
small numbers, open study
Zijlstra et al Arthritis Rheum 2002 46: S105
RCT no effect (lower dosage)
• Reboxetin Browne & Chong 10th World Congresson Pain report 2002 Open label, 25 patients better pain and fatigue
Target:SleepTarget:Sleep
• ZopicloneDrewes et al, Scan J Rheum 1991,20:288-293
sleep better, pain + stiffness same
• ZolpidemMoldofsky et al, J Rheum 1996, 23:529-533
sleep better, pain + TePs + stiffness same
Side Effects
• Tramadol: • nausea, vomiting, CNS, pruritus, rash
• TCA: • urinretention, ileus, dry mouth
• SSRI: • nausea, vomiting,CNS, sexual dysfunction, hyponatremi, serotonergic
syndrome (hyperthermia + muscle spasmer +CNS/autonomic symptoms)
Future therapies?
• Gabapentin • Cation channel blocker, GABAergic transmission enhancer• role in FM? Case reports
• Pregabalin (anti eptileptic drug)
• Crofford et al, 2002 ACR S613• RCT dose-response 8wk trial
effective pain,fatigue,sleep disturbance,global assessment
• Milnacipran
• Gendreau et al, J of Pain 2003 4: Supp 1:80• NA+5-HT blockade + NMDA antagonism• Phase 11 trials published• Better pain, fatigue, mood
Future therapies?
• Rationale
• 5-HT3 antagonists
• Tropisetron Samborski et al Materia Medica Polona 1996 28: 17-9 19 in open trial pain and tenderness, vegetative symptoms
• Ondansetron Stratz et al Zeischrift fur Rheumatologie 1994 53: 335-8 crossover design pain and tenderness in 14/34
Future therapies?
• NMDA antagonists
• NK1 antagonists
• α2 agonists
• In the morning they asked her how she had slept. ”Dreadfully!” said the princess. ”I hardly got a wink of sleep all night! Goodness knows what can have been in the bed! There was something hard in it and now I´m just black and blue all over! It is really dreadful!”
……Only a real princess could be so tender as that.
The princess and the pea by
Hans Christian Andersen
Parker Instituttet