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Opioid Pharmacology and Nociceptive Pain Pathways
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Opioid Pharmacology and Nociceptive Pain Pathways
Opioid Pharmacology and Nociceptive Pain Pathways
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1
Question
How do opioids reduce transmission of pain signals?
Page 11
Answer
They bind opioid receptors and inhibit release of pain-related neurotransmitters, reducing pain-signal transmission.
2
Question
How do endogenous pain modulators reduce pain transmission?
Page 9
Answer
They inhibit neurotransmitter release in the dorsal horn, reducing pain-signal transmission to the brain.
3
Question
Which opioid adverse effect is the major cause of death?
Page 22
Answer
Dose-dependent respiratory depression is the major cause of death.
4
Question
An oxycodone regimen of 10 mg every six hours produces which daily MME?
Page 30
Answer
The total daily dose is 60 MME/day.
5
Question
What clinical action is recommended at an opioid dose of at least 50 MME/day?
Page 26
Answer
Reassess therapy and consider tapering or alternatives.
6
Question
How do opioids produce pain relief and euphoria?
Page 3
Answer
They relieve pain and cause euphoria by binding to opiate receptors.
7
Question
Which body regions contain the highest concentrations of opioid receptors?
Page 3
Answer
The central nervous system, pituitary gland, and gastrointestinal tract have the highest receptor concentrations.
8
Question
Which three peptide families in the brain are mimicked by opioids?
Page 3
Answer
Endorphins, enkephalins, and dynorphins.
9
Question
Which agonists are listed for the μ opioid receptor?
Page 4
Answer
Morphine, enkephalin, and β-endorphin act as listed μ-receptor agonists.
10
Question
Which major effects result from μ opioid receptor activation?
Page 4
Answer
It produces supraspinal and spinal analgesia, euphoria, inhibited intestinal motility, respiratory depression, sedation, and orthostatic hypotension.
11
Question
Which agonists are listed for the κ opioid receptor?
Page 4
Answer
Cyclazocine and dynorphin are listed κ-receptor agonists.
12
Question
Which major effects are associated with κ opioid receptor activation?
Page 4
Answer
Weak miosis, sedation, spinal and supraspinal analgesia, dysphoria, and hallucinations.
13
Question
Which agonist is listed for the δ opioid receptor?
Page 4
Answer
Enkephalin is the listed δ-receptor agonist.
14
Question
How does δ opioid receptor activation affect pain and smooth muscle?
Page 4
Answer
It produces spinal analgesia, inhibition of smooth muscle, and supraspinal analgesia.
15
Question
What does nociception allow the body to perceive and respond to?
Page 5
Answer
It is detection and transmission of noxious stimuli to the brain, allowing pain perception and response.
16
Question
Which four steps constitute the nociceptive pain pathway?
Page 5
Answer
Transduction, transmission, perception, and modulation.
17
Question
Where does pain transduction occur in the body?
Page 6
Answer
It occurs at nociceptors in the skin, joints, muscles, and viscera.
18
Question
How does tissue injury produce an electrical nociceptive signal?
Page 6
Answer
Tissue damage releases inflammatory mediators that activate or sensitize nociceptors, converting a physical stimulus into an action potential.
19
Question
Which inflammatory mediators activate or sensitize nociceptors during transduction?
Page 6
Answer
Prostaglandins, bradykinin, histamine, ATP, and hydrogen ions.
20
Question
How do A-delta fibers transmit nociceptive pain?
Page 7
Answer
A-delta fibers are myelinated and fast-conducting. They transmit sharp, localized pain.
21
Question
How do C fibers transmit nociceptive pain?
Page 7
Answer
C fibers are unmyelinated and slow-conducting. They transmit dull, burning, or aching pain.
22
Question
Where do primary nociceptive afferent fibers synapse within the spinal cord?
Page 7
Answer
They synapse in the dorsal horn, primarily in the substantia gelatinosa of gray matter in laminae I and II.
23
Question
How does glutamate contribute to dorsal-horn pain transmission?
Page 7
Answer
Glutamate is the primary excitatory neurotransmitter and acts on AMPA and NMDA receptors.
24
Question
How does substance P contribute to nociceptive signaling?
Page 7
Answer
It enhances and prolongs the excitatory response through neurokinin-1 receptors.
25
Question
How does calcitonin gene-related peptide affect pain signaling?
Page 7
Answer
It contributes to signal amplification and vasodilation.
26
Question
How does ATP contribute to dorsal-horn pain transmission?
Page 7
Answer
It activates purinergic receptors, enhancing pain signals.
27
Question
How do second-order nociceptive neurons travel from the spinal cord to the brain?
Page 7
Answer
Second-order neurons cross to the contralateral spinal cord and ascend through the spinothalamic tract to the brain.
28
Question
Which brain regions are involved in conscious pain perception?
Page 8
Answer
It occurs primarily in the thalamus, somatosensory cortex, limbic system, and frontal cortex.
29
Question
How does the perception step shape the experience of pain?
Page 8
Answer
The brain becomes consciously aware of pain and interprets its location, intensity, and emotional impact.
30
Question
How does pain modulation regulate the nociceptive response?
Page 9
Answer
Descending inhibitory pathways travel from the brainstem to the spinal cord and dampen the pain response.