Why Must Chest Tubes Be Attached to a Water-Seal Drainage

question 12

Multiple Choice

Why must chest tubes be attached to a water-seal drainage system?

• A) to keep the pleural cavity humid
• B) to add weight to the drainage device to keep it upright
• C) to keep the microbial count in the drainage from reentering
• D) to keep air from reentering thoracic space to reestablish negative pressure for respiration

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