Pain Flashcards
Gate control theory
- why each person interprets painful stimuli differently.
- Explains why hot/cold and electrical stimulation can provide pain relief.
1. Small Nerve Fibers conduct pain stimuli toward the brain.
2. Large Nerve Fibers inhibit transmission of pain impulses from the spine to the brain by sending nonpain impulses.
3. A “gate” in the spinal cord with these nerves determines which impulses reach the brain.
4. The “gate” limits the amount of sensory info that can be processed at one time, therefore cells in the spine “close the gate” when excess info is sent through
.5. The brain contributes by interpreting past experiences to influence how the “gate” works and regulating behavioral
Acute pain
- Rapid onset
- warning
- Must resolve the underlying disease process / cause must heal first
Chronic pain
- last beyond the normal healing period
- persistent or intermittent
- periods of remission and exacerbation
- usually difficult for patient to describe
- associated conditions
- can be difficult to treat (have to change methods of treatment when one on longer works)
Cancer related pain
Acute or chronic
Breakthrough pain
Set an increase in pain even after pain medication has been given
Origin of pain
Cutaneous
Somatic
Visceral
Referred
Causes of pain
- neuropathic injury = malfunction of nervous system (burning, stabbing)
- intractable= Resistant to therapy in interventions (chronic)
- phantom =Receptors in nerves absent but patient still experiences pain
- psychogenic = no identifiable physical cause for the pain
Factors affecting elderly pain response
- Multiple chronic illnesses -increased over the counter medication usage
- increased risk for toxicity
- decreased renal, liver and G.I. function
- changes in body weight and proteins stores -decrease metabolism risk for depression
Pain assessment subjective data
- location (does it radiate)
- intensity (scale should be used)
- quality( burning, stabbing, sharp, dull)
- timing (onset, duration, most intense)
- aggravating factors ( what makes it worse)
- alleviating factors ( what helps)
- impact on ADLS and lifestyle
Pain assessment objective data
- nonverbal cues
(restlessness, crying, guarding the affected area, clenching fist) - physiological changes
(increased BP, HR, pallor, diaphoresis, pupil dilation, increase muscle tone, LOC, rapid irregular RR) - patient behaviors
(anxiety, aggressiveness, confusion in elderly, moaning, sighing, social withdrawal, fatigue)
Pain management intervention
- assess for pain using appropriate scale even if patient does not appear to be in pain
- avoid judgment
- create environment for therapeutic communication
- involve the patient in plan of care
- alleviate any fears or concerns
- beware of common misconceptions about pain and pain relief methods
- identify patient goals for pain relief
- Explain process of pain management
Pain management interventions continued
- perform detailed pain assessment
- establish pain relief goal with patient
- attempt to treat the cause of the pain first
- alter the pain experience for the patient
- implement non-pharmacological interventions
- administer pharmacological pain measures as ordered as a final measure
Non pharmacological pain interventions
- Distraction: focus on something else (effective with children)
Ex: counting objects, reading watching tv, music, toy, game - humor: for patient with mild pain
- imagery: concentrate senses on a imagery
(more effective with chronic pain) - relaxation: reduces muscle tension and anxiety (effective with other measures)
Nonpharmacological pain interventions continued
- Cutaneous stimulation: based of gate control (heat/ice, TENS, acupressure)
- Acupuncture
- Hypnosis
- Biofeedback: Machine monitors physiologic responses and patients are taught to practice pain relieving techniques
TENS- Transcutaneous electrical nerve stimulation
Can be used throughout the day or worn for extended periods of time depending on doctors orders
Has been known to improve mobility after surgery and reduce postop pain
Stimulation for pain management
- Electrical Stimulation: Low voltage electrical impulses apply to certain parts of the nervous system (TENS)
- Spinal cord stimulation: surgically implanted device that allows patient to provide the electrical stimulation
- Deep brain stimulation: Electrodes placed on selected sides in the brain
Works best for intractable pain (pain where nothing else seems to help)
Analgesic
- medication used to relieve pain
Ex: opioids, non opioids, adjuvants - should be used in combination with other nonpharmacological pain relief measures
- use the simplest and least invasive methods/medication’s first!
- should be mindful of under medicating pain
- Access past medical history to determine previous responses to certain treatments
non opioid analgesics
- mild to moderate pain
- affective with arthritis, cancer related bone pain, postop pain
- affective in combination with opioids
- usually OTC !
Acetaminophen (Tylenol) - NSAIDS (nonsteroidal anti inflammatory drugs)
NSAIDS (nonsteroidal anti inflammatory drugs)
COX 1: mediates prostaglandin formation involved in inflammation and protection of the lining of the stomach
COX 2: mediates prostaglandin formation involved in pain, inflammation, and fever
Opioid analgesic
“Narcotic” moderate to severe pain
- bind opioid receptors in the brain, alter pain perception
- Morphine, meperidine (Demerol) codeine, hydrocodone, oxycodone, tramadol, hydromorphone (dilaudid) fentanyl
Routes: oral, IM, Iv etc
Opioid analgesic side effects
- sedation: more likely with increased doses
- risk for respiratory depression
- nausea and vomiting
- constipation
- pruritus
- urinary retention
- decreased HR and BP, confusion in elderly!, cough suppression
Adjuvant drugs
Not used for pain, but enhance side effects of analgesic
- May reduce side effects from analgesic meds
- may reduce anxiety related pain
- effective with metro path of pain
Example:
- tricyclic antidepressant: amitriotyline (Elavil)
- anti seizure medication: phenytoin (Dilantin)