Review note: AI-assisted draft independently checked against the cited sources by a separate AI reviewer. Not clinician-reviewed. Use with your course materials, supervised clinical training and current local policies.
Chest-tube questions connect respiratory anatomy with patient assessment. Understanding the pleural space helps explain both drainage-system checks and the urgency of a deteriorating patient.
Anatomy connection: Open the pleura cutaway in 3D
The anatomy
- Visceral pleura covers the lung.
- Parietal pleura lines the chest wall, mediastinum and upper surface of the diaphragm. See it in 3D.
- The pleural space is a potential space between these layers, normally containing a thin film of fluid. See it in 3D.
During quiet spontaneous breathing, pleural pressure is normally below atmospheric and alveolar pressure. The pressure difference across the lung helps keep it expanded. OpenStax, 22.3
Pneumothorax
A pneumothorax is air in the pleural space, which can cause partial or complete lung collapse. Management depends on symptoms, stability, cause and extent. Some small, stable cases can be observed with follow-up; others require aspiration or a chest drain. MedlinePlus
Tension pneumothorax is an emergency. Worsening respiratory distress, hypoxemia or circulatory compromise requires immediate escalation; do not wait for every classic sign to appear.
Assess the patient, then the system
Assess breathing effort, oxygenation, breath sounds, vital signs and pain. New distress or sudden deterioration takes priority over routine equipment checks. Stay with the patient, obtain urgent assistance, and support oxygenation as indicated under the emergency protocol. Open RN, troubleshooting
For a conventional drainage unit:
| Check | Meaning and action |
|---|---|
| Position | Keep the unit upright and below chest level; maintain tubing free of kinks and dependent fluid-filled loops |
| Water seal | Fill to the manufacturer's specified level, commonly 2 cm; some devices use a different seal design |
| Tidaling | Respiratory movement can be expected; its absence can reflect re-expansion, suction effects, obstruction or displacement, so assess patient and system |
| Water-seal bubbling | Intermittent bubbles can occur as air exits a pneumothorax; continuous bubbling requires evaluation for an ongoing patient or system air leak |
| Wet suction control | Use the prescribed water-column level, often −20 cm H₂O, with gentle bubbling when suction is applied |
| Dry suction control | Set the prescribed level and check the device's suction indicator; wet-chamber bubbling rules do not apply |
Check connections and the insertion site when evaluating a leak, and escalate an unresolved leak or deterioration promptly. Follow device instructions and local policy. Open RN, nursing responsibilities, NSW ACI, troubleshooting
Do not routinely clamp or strip a chest tube. Clamping can trap air and cause tension pneumothorax; stripping can generate harmful pressure. Any specific clamping or tube-clearing procedure requires the appropriate order, training and local protocol. Positive-pressure ventilation adds particular risk. Open RN, nursing responsibilities, NSW ACI, clamping
Drainage changes to report
Measure and record the amount, appearance and trend. Promptly report sudden bright-red output, rapidly increasing drainage, or bleeding with changes in vital signs. Do not wait four hours.
Open RN includes an average above 200 mL/hour for four hours among reportable findings, but this is not a safe waiting rule. Its troubleshooting chapter separately flags a sudden increase above 200 mL/hour, and NSW guidance uses lower reporting thresholds in some settings. Apply the ordered limits and act sooner when the patient or drainage is concerning. Open RN, 6.3, Open RN, 6.4, NSW ACI, drainage
Unexpected cessation of previously flowing fluid needs assessment for obstruction or displacement. A tube placed to drain air may have little fluid output. Report new cloudy or purulent drainage for evaluation; appearance alone does not establish a diagnosis.
Disconnection and accidental removal
Both require immediate assistance, patient reassessment and the facility's emergency chest-drain protocol.
- Disconnection: promptly arrange restoration or replacement of the closed drainage system. Some protocols use temporary immersion of the patient-connected tube's distal end in sterile water or saline to maintain a water seal; this is a temporary, protocol-specific measure. Do not leave the tube clamped while waiting for help.
- Tube pulled out: immediately protect the insertion site with the sterile dressing specified by local protocol, call for help and monitor for deterioration. Do not reinsert the displaced tube. Open RN describes a dressing taped on three sides, but that technique must not be treated as universal or assumed to form a reliable one-way valve. Follow the facility's specified dressing and escalation procedure.
Open RN, emergency troubleshooting. Institutional instructions differ: the Royal Children's Hospital guideline illustrates a different dressing approach in a pediatric setting; it is not an adult procedure template.
NCLEX-style reasoning
- Continuous bubbling in the water seal? Assess the patient and look for a patient or system air leak.
- Gentle bubbling in a wet suction-control chamber? Expected when suction is applied correctly.
- Drainage unit on the bed? Place it upright below chest level and check the tubing.
- Tube pulled out with worsening dyspnea? Obtain emergency assistance while immediately protecting the site according to protocol and supporting the patient's breathing.
Practice it in 3D
Open the pleura cutaway and select the pleural space. Then try the lungs Practice set.
Sources
- Open RN, Nursing Advanced Skills, 6.3
- Open RN, Nursing Advanced Skills, 6.4
- OpenStax, Anatomy & Physiology 2e, 22.3
- MedlinePlus, Collapsed Lung
- NSW Agency for Clinical Innovation, Pleural Drains in Adults: troubleshooting
- NSW ACI, drainage
- NSW ACI, clamping
- Royal Children's Hospital Melbourne, chest-drain management (pediatric institutional example of protocol variation)
AI-assisted educational content for exam preparation. Chest-drain management requires clinical training, device instructions, facility policy and provider orders.