When a contaminated chest tube end is submerged, how deep should it be placed to maintain a water seal?

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Multiple Choice

When a contaminated chest tube end is submerged, how deep should it be placed to maintain a water seal?

Explanation:
A water-seal chest drain works by having the end of the tube submerged to form a one-way valve that lets air and fluid escape from the chest but prevents air from flowing back in. The distal end should be placed about 1–2 cm below the water surface to maintain this seal. Submerging only 0.5 cm risks losing the seal and allowing backflow, while submerging much deeper (such as 5 or 10 cm) increases resistance to outflow and can hinder drainage. Therefore, about 1–2 cm provides a stable seal that allows bubbling when air leaves the pleural space without letting air re-enter.

A water-seal chest drain works by having the end of the tube submerged to form a one-way valve that lets air and fluid escape from the chest but prevents air from flowing back in. The distal end should be placed about 1–2 cm below the water surface to maintain this seal. Submerging only 0.5 cm risks losing the seal and allowing backflow, while submerging much deeper (such as 5 or 10 cm) increases resistance to outflow and can hinder drainage. Therefore, about 1–2 cm provides a stable seal that allows bubbling when air leaves the pleural space without letting air re-enter.

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