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Exam NCLEX-RN topic 4 question 40 discussion

Actual exam question from Test Prep's NCLEX-RN
Question #: 40
Topic #: 4
[All NCLEX-RN Questions]

A post-lung surgery client is placed on a chest tube drainage system. When explaining to the family how the system works, the nurse states that the water-seal bottle of a three-bottle chest drainage system serves which of the following purposes?

  • A. Collection bottle for drainage
  • B. Pressure regulator
  • C. Preventing accumulation of blood around the heart
  • D. Preventing air from entering the chest upon inspiration
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Suggested Answer: D 🗳️
(A) There is a separate collection bottle for drainage as part of a chest drainage system. (B) In a three-bottle chest drainage system, one bottle serves only as a pressure regulator. (C) Mediastinal chest tubes prevent accumulation of blood around the heart immediately following heart surgery. (D) The purpose of the water- seal bottle in any chest drainage setup is to allow air out of the chest, but not back in. This negative pressure promotes lung expansion.

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