A pilot flying with a severe cold may be at greater risk for ear pain during descent due to?

Question

BlackTom AI · Accepted Answer

Eustachian tube dysfunction prevents the middle ear from equalizing pressure with the outside air, producing pain during descent.

1. Relevant knowledge points and concepts
- The middle ear is an air-filled cavity separated from the external ear by the tympanic membrane (eardrum). The Eustachian tube connects the middle ear to the nasopharynx and normally opens during swallowing or yawning to equalize pressure.
- During aircraft descent ambient (cabin) pressure increases. For comfort and safety, the middle ear pressure must match ambient pressure; otherwise the tympanic membrane is stressed.
- Upper respiratory infections or colds cause mucosal swelling and mucus that can block or impair Eustachian tube function (Eustachian tube dysfunction), preventing pressure equalization and causing pain or barotrauma.

2. Step-by-step reasoning
- As the plane descends, external/cabin pressure rises.
- If the Eustachian tube is open, gas in the middle ear moves into or out of the nasopharynx to equalize pressure, so the tympanic membrane remains unstressed.
- If the Eustachian tube is blocked (from cold-related inflammation), the middle ear pressure cannot rise to match the cabin pressure.
- The result is relative negative pressure in the middle ear, pulling the tympanic membrane inward and stretching it, which produces pain and can lead to hearing loss or, in severe cases, barotrauma.

3. Calculations
- No numerical calculation is required; this is a physiological pressure-equalization mechanism rather than a numeric computation.

4. Why the correct answer is correct
- Blockage of the Eustachian tubes directly prevents pressure equilibration between the middle ear and cabin during descent, producing the characteristic ear pain.

5. Why other options are incorrect
- Enhanced hearing sensitivity: would not cause pain specifically during descent and is unrelated to pressure changes.
- Excessive cabin noise: may cause discomfort or hearing damage but not the characteristic pressure-related ear pain on descent.
- Increased blood circulation: systemic or local increased blood flow does not explain the acute pressure-related pain experienced during descent.

6. Conclusion
- Therefore, the correct answer is "Blockage of the Eustachian tubes," which matches the provided answer.

A pilot flying with a severe cold may be at greater risk for ear pain during descent due to? 单项选择题

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