Opioids
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Questions and Answers

Which opioid is 5 times more potent than morphine and suitable for PCA and intrathecal administration?

  • Tramadol
  • Hydromorphone (correct)
  • Pentazocine
  • Buprenorphine
  • What is the primary metabolite of hydromorphone responsible for its neuroexcitatory effects?

  • Glucuronic acid
  • Morphine
  • Hydromorphone-3-glucuronide (correct)
  • Naloxone
  • Which opioid has a partition coefficient of 525 and 5 times more lipid-soluble than morphine?

  • Pentazocine
  • Buprenorphine
  • Hydromorphone (correct)
  • Tramadol
  • Select the opioid agonist-antagonist agent that stimulates presynaptic serotonin release in the descending inhibitory pain pathways.

    <p>Tramadol</p> Signup and view all the answers

    Which enzyme interference can prolong the metabolism of fentanyl?

    <p>CYP3A</p> Signup and view all the answers

    What is the principal portion that binds sufentanil in terms of protein binding?

    <p>Acid glycoprotein</p> Signup and view all the answers

    What is the primary route of excretion for sufentanil?

    <p>Both urine and feces</p> Signup and view all the answers

    How does sufentanil's context-sensitive half-time compare to alfentanil for infusions up to 8 hours?

    <p>Sufentanil has a shorter half-time</p> Signup and view all the answers

    Which of the following cardiovascular effects is associated with sufentanil?

    <p>Bradycardia</p> Signup and view all the answers

    What is the primary mechanism of action for opioid agonists in producing antinociception?

    <p>Hyperpolarization and decreased release of excitatory neurotransmitters</p> Signup and view all the answers

    Where are the opioid receptors located in the brain according to the text?

    <p>Locus coeruleus, Periaquaductal gray, Rostral ventral medulla</p> Signup and view all the answers

    Which classification of opioids includes molecules that bind specifically to opioid receptors but produce both agonistic and antagonistic effects?

    <p>Semisynthetic agonist-antagonists</p> Signup and view all the answers

    What is the primary role of endogenous opioid peptides like endorphins?

    <p>Placebo effect modulation</p> Signup and view all the answers

    Where are peripheral opioid receptors synthesized according to the text?

    <p>Dorsal root ganglia</p> Signup and view all the answers

    What is the effect of hyperpolarization in neurons within afferent pain pathways?

    <p>Reduction in hyperexcitability of nerve endings</p> Signup and view all the answers

    What is the reason for the rapid onset of Alfentanil?

    <p>Low pKa</p> Signup and view all the answers

    What is the primary route of metabolism for Remifentanil?

    <p>Plasma and tissue esterases</p> Signup and view all the answers

    Which factor does NOT contribute to the context-sensitive half-time prolongation following a Remifentanil infusion?

    <p>Rapid blood-brain equilibrium</p> Signup and view all the answers

    Which side effect is NOT commonly associated with Remifentanil?

    <p>Histamine release</p> Signup and view all the answers

    Which of the following is a clinical use of opioid antagonists?

    <p>Preventing postoperative ileus</p> Signup and view all the answers

    What is a concern associated with naloxone administration?

    <p>Renarcotization</p> Signup and view all the answers

    What is the mechanism behind opioid-induced hyperalgesia?

    <p>Activation of ascending facilitation pathways</p> Signup and view all the answers

    Which of the following is NOT a sign or symptom of serotonin syndrome?

    <p>Bradycardia</p> Signup and view all the answers

    What is the main concern with long-term or high-dose opioid treatment?

    <p>Opioid-induced hyperalgesia</p> Signup and view all the answers

    What is the potential concern when administering naloxone in large doses?

    <p>Precipitation of neonatal withdrawal syndrome</p> Signup and view all the answers

    Which receptor does naloxone exhibit the greatest affinity for?

    <p>μ receptor</p> Signup and view all the answers

    Which option correctly describes the mechanism behind opioid tolerance?

    <p>Increased synaptic concentrations of glutamate and NMDA receptor activation</p> Signup and view all the answers

    Hydromorphone is 5 times less potent than morphine.

    <p>False</p> Signup and view all the answers

    Tramadol is an opioid agonist-antagonist agent that stimulates catecholamine release.

    <p>False</p> Signup and view all the answers

    Pentazocine is the analgesic agent that stimulates presynaptic serotonin release in the descending inhibitory pain pathways.

    <p>True</p> Signup and view all the answers

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