NURS 171 Week 11: Pain Flashcards
Pain
- unpleasant sensory, emotional experience
- subjective experience
- can not be measured objectively
- can interfere with quality of life, interfere with activities of daily living
- destructive to both patient and family
- can be a warning sign
How can Pain be Classified?
- by region of the body involved
- cause
- duration
- pattern of occurrence/ quality
- intensity
- time since onset
Origin of Pain
site where pain is felt, not necessarily the source of pain
- cutaneous/superficial
- visceral
- deep somatic
- radiating
- referred
- phantom
- psychogenic
Origin of Pain: Cutaneous/ Superficial
arises in the skin or subcutaneous tissue
- ex: hot object/ paper cut
- significant short term pain
Origin of Pain: Visceral
(organs)
- stimulation of deep internal pain receptors
- most often in abdomen cavity, cranium, or thorax
- pain may vary from local, achy, discomfort to more widespread, intermittent and crampy pain
- ex: menstrual cramps, bowel disorders, and organ cancers
Origin of Pain: Deep Somatic
(deep tissue)
- ligaments, tendons, nerves, blood vessels, and bones
- more diffuse than cutaneous pain and lasts longer
- ex: fracture/ sprain, arthritis, bone cancer
Origin of Pain: Radiating
- starts at the origin
- extends to other locations
- ex: severe sore throat may extend to ears and head
- ex: GERD: chest pain
Origin of Pain: Referred
occurs in area distant from original site
-ex: MI–> down arm or across back
Origin of Pain: Phantom
perceived to originate from area that has been surgically removed
- after a limb has been removed, the nerve endings that remain, transmit to the brain that the body part still has pain, even though it has been removed
ex: amputated limbs: burning, itching, and deep pain
Origin of Pain: Psychogenic
believed to arise from the mind
- perceived pain though no physical cause can be identified
- when no medical reason can be found for the pain (is it real, or is it in the mind?)
Causes of Pain
- nociceptive
- neuropathic
Nociceptive
-pain receptors are stimulated
>visceral (organs)
>somatic (tissues + bones)
-most common type
-pain receptors (nociceptors are stimulated)
-noxious, thermal, chemical, or mechanical stimuli
-trauma, surgery, or inflammation
“aching”
-visceral (organs) and somatic (tissues and bones)
Neuropathic
nerves are injured
- complex and often chronic
- injury to one or more nerves
- repeated transmission of pain signals even in absence of painful stimuli
- nerve injury: poorly controlled diabetes, stroke, tumor, alcoholism, amputation, viral infection (shingles, HIV, AIDS)
- medications can trigger nerve injuries
- burning, numbness, itching and pins and needles or prickling pain
Duration of Pain
- acute
- chronic
- intractable
Duration of Pain: Acute
short duration/ rapid onset
- varies in intensity
- may last up to 6 months
- injury or surgery
- “protective” indicates potential or actual tissue damage
- usually disappears as tissue heals
Duration of Pain: Chronic
pain that has lasted 3 to 6 months or longer
- often interferes with activities of daily living
- related to a progressive disorder or with no current tissue injury such as neuropathic pain
- may experience periods of remission or exacerbation
- often viewed as insignificant by family + care providers
- patients may withdrawal, have depression, anger, frustration, and dependence
Duration of Pain: Intractable
chronic and highly resistant to relief
- frustrating
- multi-modal pain therapy
Quality of Pain: Described by Patients
- sharp
- dull
- aching
- throbbing
- stabbing
- burning
- ripping
- searing
- tingling
Quality of Pain: Length
- Episodic
- Intermittent
- Constant
Quality of Pain: Intensity
- mild
- distracting
- moderate
- severe
- intolerable
What Happens When Someone Has Pain? Transduction
activation of nociceptors by stimuli
- activated by perception of mechanical, thermal, or chemical stimuli
- chemicals (bradykinin, histamine, prostaglandins) released: Bradykinins cause inflamed, red, swollen, tender
- Mechanical: trauma
- Thermal: extreme heat or cold
- Chemical: acid (like lemon juice) on open skin or tissue ischemia
Bradykinin
cause inflamed, red, swollen, tender
- inflammation is most frequent cause of pain
- released during transduction (when someone has pain)
What Happens When Someone Has Pain? Transmission
- conduction of pain message to spinal cord
- pain transmission involves chemicals called neurotransmitters
Transmission
peripheral nerves carry pain message to dorsal horn of spinal cord
-A Delta Fibers: myelinated fast pain impulses: acute, focused mechanical + thermal stimuli; bumped knee
-C Fibers: smaller unmyelinated fibers transmit slow pain impulses
>dull, diffuse pain impulses travel at a slow rate
>mechanical, thermal, and chemical stimuli
>lingering ache
Transmission: A Delta Fibers
myelinated fast pain impulses
- acute, focused mechanical and thermal stimuli
ex: bumped knee
Transmission: C Fibers
smaller, unmyelinated fibers transmit slow pain impulses
- dull, diffuse pain impulses travel at a slow rate
- mechanical, thermal, and chemical stimuli
- lingering ache
Pain Perception
recognizing and defining pain in frontal cortex
Pain Threshold
brain recognizes and defines stimulus as pain
Pain Tolerance
duration or intensity of pain a person can endure
Pain Modulation
changing pain perception by facilitating or inhibiting pain signals
- Endogenous Analgesia System
- Gate Control Theory
Pain Modulation: The Endogenous Analgesia System
neurons in the brain-stem activate descending nerve fibers that conduct impulses back to the spinal cord
- impulses trigger release of endogenous opioids and other substances to block pain impulse
- can be stimulated by various pain medications and non pharmacological measures
Endogenous Opioids
naturally occurring analgesic neurotransmitters
- inhibit the transmission of pain impulses
- bind to opiate receptor sites in the central and peripheral nervous system
- 4 receptor sites: Mu, Kappa, Delta, Sigma
- each site has a different affinity for various pain medications
4 Receptor Sites Endogenous Opioids Bind To
-Mu
-Kappa
-Delta
-Sigma
each site has a different affinity for various pain medications
The Gate Control Theory
pain impulses can be influenced/ controlled at the spinal level
- theory: block the “gate” with a non noxious stimulation and block the perception of pain
- asserts that non-painful input closes the “gates” to painful input which prevents pain sensation from traveling to the CNS
- stimulation by non noxious input is able to suppress pain
The Gate Control Theory: Two Types of Fibers
- those that produce pain
- those that inhibit pain
Examples for Gate-Control Theory
-TENS unit
-mediation
-exercise
-relation
-laughter
(compete with C fibers and block the gate)
What Factors Influence Pain?
- emotions
- developmental stage
- sociocultural factors
- communication skills
- cognitive impairments
Factors Influence Pain? Emotion: Fear
- is illness or injury life threatening?
- progressive pain intolerable?
- judged as weak if complain?
- addictive?
- fears can prolong or increase patients pain
Factors Influence Pain? Emotions: Confusion + Helplessness
- role guilt
- when alone may experience loneliness or even a sense of abandonment
Factors Influence Pain? Emotions: Anxiety + Depression
- anxiety + depression are common in people who are ill or hospitalized
- anxiety associated with acute pain
- anticipation of pain may trigger anxiety
- waiting for surgery or procedure
- depression most often linked with chronic pain, especially intractable pain
Factors Influence Pain? Emotions: Previous Pain Experience
- previous pain experience affect emotions
- previous numerous painful experiences can lead to more anxiety and more sensitivity to pain
- if previous pain was controlled are less anxious and trust in pain relief
Factors Influence Pain? Emotions
-fear
-confusion + helplessness
-anxiety + depression
-previous pain experience
-illness and pain trigger emotional reactions
-emotional reactions exacerbate pain
-pain is usually a combination of physical + emotions
Interventions: relieve feelings of fear + helplessness, reflective listening, gentle touch, pain medication
Factors Influence Pain? Emotions: Interventions
- relieve feelings of fear + helplessness
- reflective listening
- gentle touch
- pain medication
Older Adults Vs Pain Influence
- 50% or greater experience pain
- may be unable to report because of cognitive impairment
- nonverbal cues: grimacing, rapid blinking, withdrawal, labored breathing, altered gait or decreased activity
- some have mental confusion or collapse
- some lead to social isolation, depression, sleep disturbances, and mobility related problems
Nonverbal cues for Pain
- grimacing
- rapid blinking
- withdrawal
- labored breathing
- altered gait
- decreased activity
What Factors Influence Pain? Sociocultural Factors
we learn behaviors associated with pain through interactions with family and social support group
- ex: minimizing pain or expression pain often tied to culture
- crying, moaning, silence, brave, smiling at polite nurse
- do not assume
- culture sensitivity
Factors Influence Pain? Communication Skills
-challenges: stroke, dementia, intubation, or limited command of language
-watch for behavioral cues (nonverbal):
>decreased activity, grimacing, frowning, crying, moaning, irritability
Factors Influence Pain? Cognitive Impairments
Indicators:
- Facial expressions (sad, frightened, rapid blinking)
- Vocalizations (noisy breathing, profanity, verbally abusive)
- Changes in Physical Activity (fidgeting, pacing, rocking, disruptive behavior)
- Changes in Routine (refusing food, difficulty sleeping)
- Mental Status Changes (increased confusion)
- Physiological Cues (elevated vital signs)
Pain Responses
- Sympathetic Response
- Parasympathetic Response
- Behavioral Response
- Psychological Response
Pain Response: Sympathetic Response
(acute pain)
- increased alertness
- dilated pupils
- increased heart rate and force
- increased respiratory rate
- increased systolic blood pressure
- rapid speech
- pallor