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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?
Correct Answer: D
Explanation/Reference: Explanation: (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.