Which term refers to a mechanical blockage of the airway?

• A. Dyspnea
• B. Apnea
• C. Aspiration
• D. Obstruction

Answer: (D)

Obstruction is the term for a mechanical blockage of the airway—a physical barrier that prevents air from flowing in or out. In oral sedation monitoring, recognizing obstruction is crucial because relaxed airway muscles can allow tissue, tongue, or other material to physically block the airway, leading to impaired ventilation. Dyspnea is the sensation of difficult breathing, which can occur with many causes and isn’t itself the blockage. Apnea means a pause in breathing, which can arise from various problems (including central or obstructive causes) and doesn’t specify a mechanical blockage. Aspiration is the event of inhaling material into the airway, which can contribute to obstruction or infection, but it describes what happens rather than the blockage itself.