Pathophysiology
Clinical meaning
A chest drainage system is a closed system that removes air, fluid, or blood from the pleural space to re-establish negative intrapleural pressure and allow lung re-expansion. The system typically consists of three chambers: a collection chamber for drainage, a water-seal chamber that acts as a one-way valve preventing air re-entry, and a suction control chamber that regulates the amount of negative pressure applied. Tidaling (fluctuation of fluid in the water-seal chamber with respiration) is an expected finding that indicates the system is functioning and patent until the lung fully re-expands. The nurse must monitor the system, report abnormal findings, and maintain patient safety.