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 (B)</p> Signup and view all the answers

Which enzyme interference can prolong the metabolism of fentanyl?

<p>CYP3A (B)</p> Signup and view all the answers

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

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

What is the primary route of excretion for sufentanil?

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

Which of the following cardiovascular effects is associated with sufentanil?

<p>Bradycardia (B)</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 (B)</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 (C)</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 (B)</p> Signup and view all the answers

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

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

Where are peripheral opioid receptors synthesized according to the text?

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

What is the reason for the rapid onset of Alfentanil?

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

What is the primary route of metabolism for Remifentanil?

<p>Plasma and tissue esterases (D)</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 (B)</p> Signup and view all the answers

Which side effect is NOT commonly associated with Remifentanil?

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

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

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

What is a concern associated with naloxone administration?

<p>Renarcotization (B)</p> Signup and view all the answers

What is the mechanism behind opioid-induced hyperalgesia?

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

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

<p>Bradycardia (D)</p> Signup and view all the answers

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

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

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

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

Which receptor does naloxone exhibit the greatest affinity for?

<p>μ receptor (A)</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 (C)</p> Signup and view all the answers

Hydromorphone is 5 times less potent than morphine.

<p>False (B)</p> Signup and view all the answers

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

<p>False (B)</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 (A)</p> Signup and view all the answers

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