A 58-year-old woman with metastasized breast cancer received IM injection of morphine for pain but she vomited after each dose. Which of the following brain areas is most likely the main site of this action of morphine?

A 46-year-old man with a history of multiple uneventful general anesthetics is undergoing a multilevel spinal fusion procedure during which 1 mg/kg of morphine is administered over 15 minutes. Shortly thereafter, the patient exhibits modest hypotension with a concomitant decrease in systemic vascular resistance, as well as an increase in pulmonary vascular

resistance as measured by a pulmonary artery catheter. These findings are unaffected by the administration of 0.2 mg of naloxone. The most likely cause of this critical incident is:

Methadone-induced constipation could be rev ersed without loss of anal gesic

effect with which of the f ollowing opioid antagonists ?

Signs and symptoms of opioid withdrawal include all of the following

EXCEPT

Which of the following narcotics is contraindicated when concurrently

administered with monoamine oxidase inhibitor (MAOI) therapy?

A drug that is a mixed opioid agonist–antagonist is

A drugs that may suppress the symptoms of opioid withdrawal is

Which one of the following opioids is ineffective as an analgesic in a significant fraction of the population due to a genetic polymorphism?

A 22-year old woman was in labor for 12 hours and was experiencing strong and very painful contractions. An epidural dose of morphine was ordered for analgesia. Which of the following neuronal areas was most likely the main site of the analgesic action of morphine in this setting?