Increased lung compliance is most often due to which of the following?

  1. Hyperventilation
  2. Increased airway resistance
  3. Increased lung compliance
  4. Poor cardiac output

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Increased airway resistance


  1. Incorrect. Patients can hyperventilate without increasing their accessory muscle use.
  2. Correct. Increased airway resistance is the most common cause of increased accessory muscle use.
  3. Incorrect. Increased lung compliance does not increase accessory muscle use. Decreased lung compliance may increase accessory muscle use.
  4. Incorrect. Cardiac output does not affect accessory muscle use.

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