Chest Tube Management on the NCLEX
Water seal, tidaling vs bubbling, disconnection and dislodgement responses, and why you never clamp routinely.
Chest tube questions hinge on one skill: reading the water-seal chamber and knowing which finding is normal.
The chambers
Collection chamber: measures drainage. Mark the level each shift; notify the provider for more than 100 mL/hr of frank red drainage or a sudden change. Water-seal chamber: filled to the 2 cm line. A one-way gate; air leaves the pleural space and cannot return. Suction chamber: wet systems bubble gently and continuously when suction is on. Vigorous bubbling here just wastes water.
Tidaling vs bubbling
Tidaling (water level rises with inspiration, falls with expiration in a spontaneously breathing patient) is normal: it proves the tube is patent. Tidaling stops when the lung has re-expanded or the tube is kinked or clotted. Intermittent bubbling in the water seal is expected while a pneumothorax drains, especially on exhalation or cough. Continuous bubbling in the water seal is an air leak. Check connections from dressing to device, then assess the insertion site. An unexplained leak gets the provider.
Disconnection and dislodgement
Tubing disconnects from the drainage unit: submerge the distal tube end 2 cm into sterile water to restore a water seal, then set up a new unit. Tube pulls out of the chest: cover the site immediately with petroleum gauze taped on three sides, so air escapes on exhalation but cannot be sucked in. Stay with the patient, call the provider, watch for tension pneumothorax (tracheal deviation, absent breath sounds, hypotension).
Never clamp routinely
A clamped tube traps air in the pleural space and can convert a simple pneumothorax to a tension pneumothorax. Clamp only briefly on provider order: locating an air leak, changing the drainage unit, or a trial before removal. Do not strip or milk the tubing routinely; it generates extreme negative pressure. Keep the unit upright and below the chest, and never lift it above the insertion site.
Frequently asked
No tidaling on day 3?
First check for kinks and dependent loops. If the tubing is clear, the lung may have re-expanded. Assess breath sounds and report.
Transporting a chest tube patient: clamp?
No. Keep the unit upright, below the chest, on water seal. Disconnect suction for transport; do not clamp.
Bubbling in the suction chamber: problem?
Gentle continuous bubbling with suction on is normal in a wet-suction system. The water-seal chamber is where continuous bubbling means a leak.
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