Chapter 26 Flashcards
A fibers
large diameter nerve fibers that carry peripherial impulses associated with temp and touch to spinal cord
*do not transmit pain
*backrubs stimulate
A delta fibers
Small Myelinated nerve fibers that carry peripheral impulses associated with pain to the spinal cord
*Respond quickly to acute pain
C fibers
Unmyelinated slow conducting fibers that carry peripheral impulses associated with pain to the spinal cord
Ergot derivative
drug that causes vascular constriction in the brain & periphery, relieves or prevents migraine headaches but is associated with many adverse effects
*reduce hyperperfuson and basilar artery vascular bed
Gate control theory
transmission of a nerve impulse can be modulated at various points along its path by descending fibers from the brain that close the gate and block transmission of pain information
MIgraine headache
headache charaterized by server, unilateral, pulsating head pain associated with systemic effects, GI upset, sensitivity to light & sound
Opioids
drugs derived from opium that react iwth specific opioid receptors throughout body
opioid agonists
drug that react at opioid receptor sites to cause analgesia, sedation or euphoria
*controlled substances
opioid agonist-antagonists
drugs stimulate or block the activity of certain opioid receptors
*less abuse potential but similar analgesic effect
opioid antagonist
drugs that block opioid receptor sites
*used to counteract the effects or treat overdose
opioid receptors
receptor sites that react to naturally occurring peptides, endorphins and enkephalins, which are receptive to opioid drugs
*found in CNS, nerves n periphery, cells in GI tract
Pain
sensory and emotional experience associated with actual or potential tissue damage
spinothalamic tract
nerve pathway from the spine to the thalamus along with pain impulses are carried to the brain
triptan
Selective serotonin receptor blocker that causes a vascular constriction of cranial vessels, used to treat acute migraine attacks
What are the 2 agents that can change perception and tolerance of pain?
Opioids & opioid antagonists
anti-inflammatory agents
Pain can be further classified by an originating source, such as
nociceptive - direct stimulus to pain recpto
neuropathic - caused by nerve injury
psychogenic - associ w/ emotional, psychological, behavioral
What do opioid receptors in the brainstem and spinal cord/thalamus do?
**In brainstem -control BP, pupil diameter, GI secretions, chemoreceptor trigger zone
***in spinal cord and thalamus - integrate and relate incoming info about pain
Endorphins are released during _____ to block the sensation of?
Stress
Pain
What are some non-pharmacological methods to treat pain?
warmth
massage
positioning
acupuncture
meditation
What are the 2 opioid recptors and what do they do?
mu (m) - pain blocking -respiratory depression, euphoria, decreased GI activity, pupil constriction, physical dependence
kappa (k) - some analgesia, pupillary constriction, sedation, dysphoria
What are the opioids that have an established pediatric dose?
codeine, fentanyl (not transdermal), hydrocodone, meperidine, morphine
What opioids are not recommended for children?
levorphanol, oxymorphone, oxycodone, methadone