Pain
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Transcript of Pain
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PAINDaniel Eshetu
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What is Pain?
“…an unpleasant sensory and emotional
experience associated with actual or
potential tissue damage, or described
in terms of such damage.”
International Association for the Study of Pain (IASP) - 1964
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Defining Pain
• There is no objective way to measure pain
• When in doubt, believe what the patient says
• Even without objective evidence, pain is very real to the individual
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Defining Pain
Pain is highly subjective to the individual experiencing it.
"Pain is whatever the experiencing person says it is, existing whenever he says it does.”
McCaffery M. Nursing Practice Theory UCLA Press,1968.
McCaffery M Pain: Clinical Manual. St. Louis: Mosby, 1999.
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Acute Pain
Well defined temporal pain onset
Associated with • subjective and
objective physical signs
Helps in limiting the damage
Pain management - Nurses
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Chronic Pain
Pain persisting for > 3 months
Less well defined temporal onset
No known useful biological purpose
Pain management - Nurses
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Anil Paleri-Addis-Jul 09 7
PERSISTING+
PHASE 2/Inflamatory
Inflammation
BRIEF
CNSPHASE 1/Nociceptive
ABNORMAL+
PHASE 3/NeuropathicNerve or CNS damage
Different Types of Pain
Cervero, F. & Laird, J. M. A. 1991
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Nociceptors: Primary afferent neurons, distinguish btwn noxious & innocuous
events.
External (eg skin) or Internal (eg viscera)Cell bodies are in dorsal root ganglia, outside spinal cord.
Nociception
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Nociception & the neurones
Two Types :A-delta fibers: Small, myelinated neurons
Fast conduction 3 to 30 m/sec.
C-fibers: Unmyelinated neuronsSlow 0.3 to 1.5 m/sec.
Contribute to the pain experience differently. A-fibers: First (immediate) sharp pain; C fibers: Mediate the delayed, dull pain.
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Neuropathic Pain
• Aberrant processes in PNS or CNS
• Sensitization from prolonged exposure to noxious stimuli or nerve injury, or through peripheral nervous system changes
• Disproportionate to the stimulation of nociceptor
• May occur without nociception
• Serves no protective function
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Mechanisms of Pathophysiologic Pain
• Injured or diseased nerves
Eg - Diabetes, peripheral neuropathies, nerve compression or infiltration
• Typically have an unusual burning, tingling or electric shock like quality
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Measurement of pain
Numeric Rating Scale
Verbal Rating Scale
Visual Analog Scale
Verbal Descriptor scales
Faces Pain Rating Scale
Pain management - Nurses
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Pain management - Nurses
Numeric Scale
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Pain management - Nurses
Simple Descriptive Scale
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Numerical rating scales
Numerical Rating Scale used at
Hospice Africa Uganda
0
1
2
3
4
5
6
0 1 2 3 4 5 6Visits
Level of pain
Other Numerical rating scales
I do not have any pain 0______1_____2______3______4______5 My pain could not be worse
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CHILDREN’S FACES PAIN SCALE
I do not have any pain 0______1_____2______3______4______5 My pain could not be worse
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Module 3:Assessing and Managing Pain
19
Features of Acute and Chronic Pain
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Pain - Evaluation
• When did pain start? Time
• What is its nature? Character
• Where is the pain? Does it radiate? Location
• What makes it better? Aggravates it?
• Constant or intermittent?
• Does it affect sleep? Severity
• Movement / Mobilization?
• Any medication taken so far? Did it help?
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Pain - Evaluation
History takingP– precipitating and reliving factors
»Palliative & Provocative factors
Q– quality of pain
R—radiation
S—site and severity
T—time course
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PAIN
Question?
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