In a three-way bottle chest drainage system, which components are included?

• A. Drainage.
• B. Suction control.
• C. Water seal.
• D. All of the above.

Answer: (D)

The main idea here is understanding what a three-bottle chest drainage system includes and why each part is essential. In this setup, there are three components, each serving a distinct role to manage a pleural drain safely and effectively.

The drainage or collection bottle is where the fluid and any air from the pleural space collect. It provides a clear place to observe and measure drainage over time, so you can assess how the patient is doing and track changes.

The water-seal chamber acts as a barrier to prevent air from flowing back into the chest. It’s filled with water to create a one-way seal; air from the pleural space can bubble through if there’s air present, which helps indicate an air leak, but air cannot travel back toward the chest. This chamber helps maintain the negative pressure needed for lung re-expansion.

The suction control chamber connects to a suction source and uses a water column to regulate the amount of applied suction. By submerging the suction tube to a certain depth, you set the negative pressure delivered to the chest, protecting against excessive suction while still providing adequate drainage.

Because each component—the drainage collection, the water-seal barrier, and the controlled suction—is necessary to manage drainage, all three are included in a three-bottle chest drainage system.