Respiratory · Topic 9 of 19
Chest Tube Management
The water-seal chamber is bubbling continuously — is that expected or is the system broken?
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Chest Tube Management
Drains air or fluid so the lung re-expands. Keep it closed, below the chest — read the water seal.
A chest drainage unit, the camera on the water-seal chamber. Four readings: tidaling (the level rises and falls with each breath — the tube is open); nonstop bubbling through every breath (an air leak); bubbles only on breathing out or coughing (expected while a pneumothorax drains); and no tidaling (the tube is blocked by a kink, clot or dependent loop, or the lung has re-expanded).
- Tidaling: the tube is patentNurse seesthe level rises and falls with each breathNurse doesnothing to fix — keep checking
- Nonstop bubbling: an air leakNurse seesbubbles through every breath in and outNurse doescheck connections from the dressing down; notify
- Bubbles on exhale or cough: expectedNurse seesbursts only as the patient breathes outNurse doesnormal while air leaves a pneumothorax
- No tidaling: blocked or re-expandedNurse seesthe level sits stillNurse doescheck for kinks, clots, dependent loops first
Trapped air can turn a pneumothorax into a tension pneumothorax
Tubing coiled flat on the bed · no dependent loops — drainage can't flow back
or a sudden increase, or bright red — it may be hemorrhage
What it's for · where it goes
UsesDrains air or fluid from the pleural space to restore negative pressure
Air tube high and in front; fluid tube low and back
Check the system
Every assessmentRed flags
Act nowIf something goes wrong
EmergenciesKeep air from getting into the chest — without trapping it there
Submerge the tube end 1–2 inches (2.5–5 cm) to restore the water seal.
Sterile occlusive (petroleum gauze) dressing, taped on three sides so air can escape.
Only briefly, with an order: to change the unit, find an air leak, or test readiness for removal.
Clamping can cause tension pneumothoraxStripping the tubing creates dangerously high negative pressure in the chest.
If the tube comes out
Flutter valveAn open chest wound covered by a square occlusive dressing taped down on three sides, with the fourth edge left free. On each breath in, the dressing is sucked flat against the wound and seals, so no air can enter the chest. On each breath out, the free edge lifts and the trapped air escapes from under it.
Nursing priorities
In orderWhich chamber is bubbling?
Don't confuse| Normal | Tidaling — rises and falls with breathing |
|---|---|
| Continuous bubbling means | An air leak — check connections, notify |
| Bubbles on exhale or cough | Expected while a pneumothorax drains |
Removal
When it comes outTidaling is good; nonstop bubbling in the water seal is a leak. In a wet suction chamber, gentle bubbling means it's working.
Sources · Open RN Nursing Advanced Skills, Ch. 6: Chest Tube Drainage Systems · Care of a Chest Tube (StatPearls) · Evidence-based update on chest tube management (American Nurse) · Chest Tube (StatPearls) · Hemothorax treatment (Medscape) · When to remove chest tubes (AFP) · Films: the NurseSavvy learning-flow visuals. Follow your facility's protocol.
Chest Tube Management
The water-seal chamber is bubbling continuously — is that expected or is the system broken? Your answer determines whether the patient's lung re-expands or collapses further.
A chest tube evacuates air or fluid from the pleural space to restore negative intrapleural pressure. The drainage system has three chambers: collection (measures output), water-seal (acts as a one-way valve — air exits but cannot re-enter), and suction control (regulates negative pressure, typically −20 cm H₂O). Tidaling — the rise and fall of fluid in the water-seal chamber with respirations — is normal and confirms the tube is patent and communicating with the pleural space. Continuous bubbling in the water-seal chamber signals an air leak; intermittent bubbling during expiration or cough is expected with a pneumothorax until the lung re-expands. You assess drainage color, amount, and rate hourly post-insertion; notify the provider if output exceeds 70–100 mL/hour of bloody drainage. Keep the system below chest level at all times. Never clamp a chest tube unless specifically ordered or when briefly changing the collection system — clamping can convert a simple pneumothorax into a tension pneumothorax. If the tube accidentally disconnects, submerge the end in sterile water (acts as an emergency water seal), not clamp it. If the tube is pulled out, cover the site immediately with petroleum gauze taped on three sides to create a flutter-valve effect.
Key Distinctions
Continuous bubbling in the water-seal chamber means air leak — not normal. Tidaling (fluctuation with breathing) IS normal and means the tube is patent; absence of tidaling may indicate lung re-expansion OR tube obstruction. Students confuse the suction-control chamber (gentle continuous bubbling is expected there) with the water-seal chamber (continuous bubbling there is a problem). Milking or stripping chest tubes is no longer routine — it generates dangerous negative pressure.
Clinical Pearl
Water-seal bubbling: intermittent = air leaving (good early on), continuous = air leak (trace the system). Suction-control bubbling: gentle and continuous = correct suction. Know which chamber you're watching.
Knowledge Check
3 quick questions on the must-knows for this topic.
What does continuous bubbling in the water-seal chamber signal?
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