Anesthetic Drug Quiz: Sedation & Pain Control

1. Which of the following best describes the primary mechanism of action of inhalational anesthetics?

Inhibition of sodium channels

Enhancement of GABA-mediated inhibition

Blockade of N-methyl-D-aspartate (NMDA) receptors

Increased potassium efflux from neurons

2. Propofol is commonly used for induction of general anesthesia. Which side effect is most clinically significant during administration?

Hypertension and tachycardia

Respiratory depression and hypotension

Bronchospasm and laryngospasm

Hyperglycemia and metabolic acidosis

3. Morphine exerts its analgesic effects primarily through which opioid receptor subtype?

Delta (δ) receptors

Mu (μ) receptors

Kappa (κ) receptors

Sigma (σ) receptors

4. Which local anesthetic is an ester compound and requires plasma pseudocholinesterase for metabolism?

Lidocaine

Bupivacaine

Procaine

Prilocaine

5. Ketamine is a dissociative anesthetic. Which statement accurately describes its mechanism?

GABA agonist activity

Non-competitive NMDA receptor antagonist

Mu opioid receptor agonist

Sodium channel blocker

6. A patient receiving fentanyl develops respiratory depression. What is the opioid antagonist of choice to reverse this effect?

Flumazenil

Naloxone

Methadone

Buprenorphine

7. Which of the following is a characteristic feature of volatile anesthetics like sevoflurane?

Rapid emergence and low airway irritation

Slow onset and prolonged recovery

Hepatotoxicity at standard doses

Increased intracranial pressure

8. Naltrexone is used clinically as a long-acting opioid antagonist. In which population is it particularly useful?

Acute opioid overdose

Opioid use disorder maintenance therapy

Postoperative pain management

Chronic back pain monotherapy

9. Methoxyflurane was withdrawn from routine anesthetic use primarily due to which adverse effect?

Hepatotoxicity

Nephrotoxicity from fluoride ions

Malignant hyperthermia triggering

Severe cardiac arrhythmias

10. Local anesthetic toxicity manifests as CNS and cardiovascular symptoms. Which agent has the highest cardiac toxicity risk?

Procaine

Lidocaine

Bupivacaine

Mepivacaine

11. Midazolam is a benzodiazepine used for sedation. Its effects are mediated through which mechanism?

GABA-A receptor positive allosteric modulation

NMDA receptor antagonism

Opioid receptor agonism

Monoamine oxidase inhibition

12. Dexmedetomidine is an alpha-2 adrenergic agonist used for sedation. Which property distinguishes it from other sedatives?

Preserves airway reflexes and allows spontaneous breathing

Causes complete muscle paralysis

Induces rapid emergence with amnesia

Increases intracranial pressure significantly

13. Remifentanil is an ultra-short-acting synthetic opioid. What structural feature enables its rapid metabolism?

Ester linkage susceptible to plasma hydrolysis

Hepatic first-pass metabolism

Renal clearance unchanged

Red blood cell esterase degradation

14. Nitrous oxide (N2O) is a weak anesthetic often combined with other agents. Which statement is accurate?

Provides complete anesthesia when used alone

Rapidly absorbed and eliminated via lungs

Increases intracranial and intraocular pressure

Causes significant hepatic metabolism

15. Succinylcholine is a depolarizing neuromuscular blocker. Which adverse effect is unique to this agent?

Prolonged paralysis in pseudocholinesterase deficiency