疼痛機制 the mechanism of pain
DESCRIPTION
The slide show is my teaching material to medical students and physicans in 2006-7.TRANSCRIPT
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From Signal to Sufferings
從電氣訊號到疼痛
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台大麻醉科孫維仁醫師
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千古艱難惟一死..
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是愛撫?還是懲罰?
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疼痛處理不當,會怎樣?
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疼痛處理得當,會怎樣?
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Dilemma in Pain Research
Nociception
Pain
Suffering
Pain behaviors
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Classical Approaches to Pain
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Classical Approaches to Pain
Anatomical
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Classical Approaches to Pain
Anatomical Physiological
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Classical Approaches to Pain
Anatomical Physiological Pathological
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Classical Approaches to Pain
Anatomical Physiological PathologicalPsychological
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傷害性刺激: Nociception
Damage
Response
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Transmission of Pain
Injury
Peri-aqueduct gray
PeripheralNerve
Dorsal RootGanglion
C-Fiber
A-beta FiberA-delta Fiber
Spinothalamic tract
Dorsal Horn
Brain
Spinal Cord
Somatosensory cortex
Ant cingular cortex
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Nerve Distribution
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The Dual Pathway
Pain stimulus
Dorsal horn
Sensorycortex
Dorsal rootganglia
Perception
Modulation
Transmission
Transduction NE
5-Ht
Opioid
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Die in peace...
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神蹟?催眠?
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The scope of pain
分子
生物體
社會群體
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分子運動
訊息傳遞
基因調節
神經系統
嬰幼期變化 c-Fos
AP-1
c-Jun-pp
AP-1 site
Dynorphin
c-Jun-ppp
p
CREB
Immediate early gene
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Molecular marker of pain
ms sec min hour day week month year
AMPA
NMDA,Sub-P, CGRPCa, NO, PKC
apoptosis ???
Neuronal Sprouting
dynorphinNPY, galanin
c-fos
Kao & Sun, Chinese J Pain, 2003.
pErk
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medialpathway
lateralpathway
Damage
Sensory discriminative
response
Emotional cognitive response
Somatosensorycortex
Ant cingularcortex
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Current Dimensions of Pain
Sensory
Damage
Response
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Current Dimensions of Pain
Sensory
EmotionalDamage
Response
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Current Dimensions of Pain
CognitiveSensory
EmotionalDamage
Response
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Current Dimensions of Pain
Sociobehavioral
CognitiveSensory
EmotionalDamage
Response
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Pain-Sleep-Mood Cycle
Panic, GAD, OCD Depression,and acute anxiety all associated with sleep disruption
Sleep deprivation increases anxiety, stress
hormones and sympathetic tone
Sleep disturbance
Anxiety
Pain
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疼痛的分期
急性疼痛 慢性疼痛
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Somatic
Visceral Neuropathic
疼痛的總類
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Mixed TypeCaused by a
combination of both primary injury or
secondary effects
Clincal Pain Nociceptive
PainCaused by activity in neural pathways in
response to potentially tissue-damaging stimuli
Neuropathic Pain
Initiated or caused by primary lesion or
dysfunction in the nervous system
Postoperativepain
Cancer painOsteoporosis
ArthritisBack pain
Postherpeticneuralgia
Neuropathic spinal stenosis
Cancer pain
Myofascial pain
Central post-stroke pain
Phantom pain
Trigeminalneuralgia
Polyneuropathy (eg,diabetic, chemotherapy)
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孫維仁
Neuropathic Pain
代謝
缺血
遺傳
壓迫
創傷
中毒
感染
免疫
Etiology SyndromeSymptoms
自發性
經由刺激誘導
神經性疼痛
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normal
spontaneous firing from damaged axon
spontaneous firing from spinal neuron
Ectopic Focus
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鄰近正常Aβ活化
C fiber 受損
正常Aβ神經
NGF
Nerve Sprouting
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Allodynia and Aβ Sprouting
X
III/IVV
I/II AβAβ
C
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Allodynia and Aβ Sprouting
X
III/IVV
I/II
nociceptive neuronsafferent inputmodulationvisceral
non-nociceptive neurons
AβAβ
C
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孫維仁
臨床表現
燒灼痛
觸感痛
緊繃感尖銳感電擊感
持續
持續
持續持續陣發性
時間 發作
自發性
誘發性
自發性誘發性
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Acute Herpes ZosterA few days…..
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Acute Herpes ZosterA week…..
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Sub-acute Herpes ZosterA few weeks…..
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Post-herpetic NeuralgiaA few months…..
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孫維仁
Natural Course of Herpes Zoster
BurningTactile-allodyniaTightnessPin-prickingShooting
Acute ChronicSub-acute
Peripheral CentralPeripheral+CentralSensitization
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孫維仁
Central Sensitization
Normal
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孫維仁
Central Sensitization
Normal
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孫維仁
Central Sensitization
Normal
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孫維仁
Central Sensitization
Normal Sensitized
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孫維仁
Central Sensitization
Normal Sensitized
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孫維仁
Central Sensitization
Normal Sensitized
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孫維仁
Central Sensitization
Normal Sensitized
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孫維仁
Definition
"Stimulus– threshold
– modality
"Response– pain
intensity
Hyperalgesia HypesthesiaAllodynia
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孫維仁
Definition
"Stimulus– threshold
– modality
"Response– pain
intensity
Hyperalgesia HypesthesiaAllodynia
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孫維仁
Definition
"Stimulus– threshold
– modality
"Response– pain
intensity
Hyperalgesia HypesthesiaAllodynia
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孫維仁
Definition
"Stimulus– threshold
– modality
"Response– pain
intensity
Hyperalgesia HypesthesiaAllodynia
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Threshold vs ResponseP
ain
Inte
nsity
10
8
6
4
2
0
Stimulus Intensity
Hyperalgesia
InjuryAllodynia
Normal
Hyperpathia
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孫維仁
Targeted Approach
Mechanisms
Signs and Symptoms
Treatment
對症下藥
對病下藥
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Management of Neuropathic Pain
• PharmaceuticalsAntidepressantsAnticonvulsantsLocal anestheticsNSAID’s/COX 2’sOpioidsα-adrenergic agentsTopical agents
• Nerve blocks– Sympathetic– Somatic
• Interventional therapies– Spinal cord stimulation– Intrathecal opioids– Neuro-lesioning
• Complementary– Acupuncture– Biofeedback/hypnosis
• Psycho-social consulting
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Pain Treatment Continuum
Least invasive
Most invasive
Psychological/physical approachesTopical medications
Oral medications*
*Consider referral if previous treatments are unsuccessful.
Injections*Interventional techniques*
Continuum not related to efficacy.
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鴉片類止痛劑
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mu-Agonist
Efficacious
dose-dependent
no ceiling
Reliable
Predictable
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NSAID
當然評價
mu-opioid
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藥理作用 藥品 μ κ 效價 管制
Agonist
Morphine ++ 1 I
Demerol ++ 1/8 II
Fentanyl ++ 100 II
Tramadol + + 1/10 III
Propoxyphene + 1/3 IV
Codeine + 1/12 III
Partial Agonist Buprenorphine + 60 III
Agonist AntagonistNalbuphine - + 1 III
Butorphanol - + 10 IV
Antagonist Naloxone -- --
Pharmacodynamic Profiles
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Adjuvants
✓ 便秘
✓ 小便滯留✓ 暈眩✓ 噁心嘔吐✓ 皮癢✓ 呼吸抑制
Laxatives & stimulants(peripheral opioid Ant)Alfa-1 blockerRitalinNovamine/Haldol/RemeronNalbuphine/ ButophanolNalbuphine/ Butophanol
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WHO止痛階梯
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WHO止痛階梯
非嗎啡類止痛藥
Step I
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WHO止痛階梯
非嗎啡類止痛藥
Step I
弱效嗎啡類止痛藥
Step II
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WHO止痛階梯
非嗎啡類止痛藥
Step I
弱效嗎啡類止痛藥
Step II
強效嗎啡類止痛藥 Step III
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WHO止痛階梯
非嗎啡類止痛藥
Step I
弱效嗎啡類止痛藥
Step II
強效嗎啡類止痛藥 Step III
九成
治癒
率
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孫維仁
TherapeuticTOXIC
「低量開始,緩慢加量」
Serum Level
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鎮痛消炎劑
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孫維仁
Analgesic Action of NSAID
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孫維仁
Analgesic Action of NSAID
Arachidonic acid
Prostaglandins
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孫維仁
Analgesic Action of NSAID
COX 1 COX 2
Arachidonic acid
Prostaglandins
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孫維仁
Analgesic Action of NSAID
COX 1 COX 2
peripheral central
nociceptor activation
neuronal sensitization
Arachidonic acid
Prostaglandins
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孫維仁
Analgesic Action of NSAID
COX 1 COX 2
peripheral central
nociceptor activation
neuronal sensitization
NSAID
Arachidonic acid
Prostaglandins
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孫維仁
Inflammation or Pain
COX-2
Pros
tagl
andi
ns
COX-1
InflamedNormal NSAID COX-2 specificinhibitor
COX-1 COX-1
Inflammation, pain
COX-1
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孫維仁
COX-2
NSAID on COX-1/2
COX-1
N-terminal
Carboxylicgroup
of NSAIDforms
“salt bridge”with
Arginineat 120
C-terminalcontainingactive sites
Arachidonic Acid
NSAID(flurbiprofen)phenyl group
binds tohydrophobic
channel
N-terminal
Carboxylicgroup
of NSAIDforms“salt
bridge”with
Arginineat 120
C-terminalcontainingactive sites
Arachidonic Acid
NSAID(flurbiprofen)phenyl group
binds tohydrophobic
channel
Kurumbail et al. Nature. 1996; 384: 644-648
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孫維仁
Specific COX-2 Inhibitor - “Side Pocket”
Hydrophilic “side pocket”
N-terminal
C-terminalcontainingactive sites
Arg 513,Hist 90 – forms hydrogen bonds with oxygen in sulfonamide side chain
Specific COX-2 inhibitor – phenyl group binds tohydrophobic channel
Arachidonic Acid
Arg 120
Kurumbail et al. Nature 1996; 384: 644-648
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抗憂鬱劑
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Antidepressants in
Multiple mechanisms of action
RCTs and meta-analyses demonstrate benefit of
amitriptyline, nortriptyline, desipramine
Variable onset of analgesia
Independent of antidepressant activity
Improvements in insomnia, anxiety, depression
*Not approved by FDA for this use.
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Tricyclic Antidepressantsfor Neuropathic Pain Disorders
Start at 10-25 mg at bedtimeincrease every few days as tolerated to a target dose of 50 mg
if no effect at 2 wk, continue to increase
may need ≥150 mg
Can split dose to reduce side effects
Expect partial effectuse multiple agents
Consider preprescription cardiac evaluation
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Tricyclic Antidepressants: Adverse Effects (AEs)
• Commonly reported AEs (generally anticholinergic):– blurred vision– cognitive changes– constipation– dry mouth– orthostatic hypotension– sedation– sexual dysfunction– tachycardia– urinary retention
• Desipramine
• Nortriptyline
• Imipramine
• Doxepin
• Amitriptyline
FewestAEs
Most AEs
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Pharmacodynamic profiles
Receptor 5-HT NE
clinical actions
antidepressionanxiolysis
antidepressionenhanced drive
side effectnausea,vomitingGI symptomsheadache
tachycardiatremorsympathomimetic
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Clinical ManifestationReceptor 5-HT1 5-HT2 5-HT3
action antidepressionanxiolysis
side effect
insomniaagitationnervousnesssexual disorder
nauseavomitingGI symptomsheadache
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Effect of mirtazapine on aminergic neurons
NA cell body
5-HT cell body
presynaptic NA neuron
α2-autoreceptor
presynaptic 5-HT neuron
postsynaptic 5-HT neurons
5-HT1 5-HT2 5-HT3
postsynaptic NA neuron
noradrenaline serotonin
α2-heteroreceptor
Remeron
vesicle
α2-autoreceptor
α1-adrenoreceptor
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Remeron
Sleep improvement !via block 5-HT2 receptors
You need to know !
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抗癲癇製劑
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Gabapentin
α2δ GABA
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Gabapentin
α2δ GABA
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Clinical ApplicationsNeuropathic Pain
Post-herpetic neuralgia
Diabetic painful neuropathy
Trigeminal neuralgia
Acute herpes zoster
Acute HIVD
Sleep disorder
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介入性止痛術
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Epidural Injection
Inter-laminar
Trans-foraminal
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Headache
inflammatory pain
spasticity-induced pain
Botulinum and Analgesia
Migraine ++ Tension-type ??
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疼痛病患問題的特質
痛覺感受的異常性
生理狀況的脆弱性
心理問題的複雜性
疾病進展的多樣性
藥物反應的不定性
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Delimma of Pain Management
Analgesia Side effect
Pain Sufferings
Treatment
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療效
副作用
止痛越強=副作用越強?
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嗜血的殺手?
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還是,混口飯吃?
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The Strategy
Mechanisms
Signs and Symptoms
Treatment
對症下藥
對病下藥
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慢性疼痛治療原則
Nociceptive-- somatic origin-- visceral origin
Non-nociceptive-- somatic origin -- visceral origin-- neuropathic origin
Opioids!!
Adjuvant! Nerve block!
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From Signal to Cells
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spinal cord
From Signal to Cells
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spinal cord
dorsal horn
From Signal to Cells
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spinal cord
dorsal horn
Sensory neuron
From Signal to Cells
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spinal cord
dorsal horn
Sensory neuron
From Signal to Cells
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From Damage to Sufferings
Damage
Response
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From Damage to Sufferings
Damage
Response
Anatomical Physiological PathologicalPsychological
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From Damage to Sufferings
Damage
Response
Anatomical Physiological PathologicalPsychological
Sociobehavioral
CognitiveSensory
Emotional