Changing a chest tube drainage system is a straightforward but high-stakes procedure that requires careful preparation, a clear understanding of the components involved, and strict attention to maintaining a closed system throughout the swap. The core principle is simple: you are replacing one sealed collection unit with another without allowing air to enter the pleural space or interrupting drainage. In practice, the system should only be changed when the collection chamber is full or the unit is malfunctioning, and the chest tube itself should not be clamped for longer than absolutely necessary during the exchange.
When to Change the System
Not every accumulation of fluid warrants a system swap. The drainage container should be changed only when it is actually full or when there is a clear mechanical problem with the unit, such as a cracked chamber or a compromised seal. Routine or scheduled changes that are not clinically indicated introduce unnecessary risk of air leak or contamination.1PubMed. Managing a chest tube and drainage system The same guidance emphasizes that the chest tube should not be clamped without a specific clinical reason. Clamping during a system change is sometimes unavoidable, but the clamped interval needs to be as brief as possible to avoid a buildup of air or fluid in the pleural space, which can quickly turn into a tension pneumothorax in patients with ongoing air leaks.
In cardiac surgery patients, drainage volumes can be significant in the first several hours postoperatively, so a unit may fill faster than expected. In thoracic surgery patients, drainage tends to be lower volume but may persist for days. Either way, the decision to change the system should be driven by what you see in the collection chamber, not by a clock on the wall.
Equipment You Need Before Starting
Having everything within arm’s reach before you begin is non-negotiable. You will need:
- New drainage unit: an Atrium or compatible system, pre-filled with sterile water to the indicated line if it is a wet-seal model.
- Padded clamps: two hemostats or specially designed chest tube clamps with rubber sheathing to prevent tube damage.
- Adhesive tape: strong medical tape for securing connections. Cross-taping with cloth or plastic tape is the most reliable method.
- Suction source: wall suction set to the prescribed level, with tubing ready to connect.
- Gloves and a clean workspace: standard infection-control precautions apply.
If the system is a wet-seal model, fill the water-seal chamber to the 2 cm mark (or whatever level the manufacturer specifies) before you bring it to the bedside. Filling it after the swap is already underway wastes precious seconds and introduces the chance of forgetting altogether. Dry-seal systems skip this step entirely, which is one reason many facilities prefer them.
The Step-by-Step Procedure
Once you have confirmed that a change is indicated and all supplies are ready, the process follows a predictable sequence. Communication with the patient matters here: if they are awake, explain that you will briefly clamp the tube, that they may feel slight discomfort or pressure, and that the procedure takes only a minute or two.
First, clamp the chest tube close to the patient’s chest wall using the padded clamps. Place two clamps in opposite directions for redundancy. This is the step that creates a temporary seal, preventing air from entering the pleural space through the open tubing once you disconnect the old system. Time starts now. Every second counts.
Second, disconnect the chest tube from the old drainage unit. The connection point is typically a bi-conical adaptor that mates the chest tube to the drainage tubing. Twist and pull firmly but carefully. If the old tape is especially adherent, you may need to cut it with bandage scissors. Do not tug on the chest tube itself near the insertion site.
Third, connect the chest tube to the new drainage unit. Push the tubing firmly onto the adaptor until it seats fully. You should feel a definitive stop. If the connection feels loose or uncertain, do not proceed until it is secure.
Fourth, tape the connection. Research comparing different methods found that cross-taping, where strips of tape are applied in an X pattern across the junction, is significantly more secure than either straight taping or plastic cable ties. In bench testing, the cross-taping method withstood a median disconnecting force of about 40 pounds, compared with roughly 32 pounds for straight taping and only about 21 pounds for plastic bands.2PubMed Central. How to secure the connection between thoracostomy tube and drainage system? This is a real-world concern: accidental disconnection is one of the more common and preventable complications of chest tube management.
Fifth, unclamp the chest tube. Do this promptly after the connection is secure and taped. Then confirm that the system is functioning: look for tidaling (the rise and fall of the water level in the water-seal chamber with respiration), note whether an air leak is present, and verify that fluid is draining if output was expected. If the patient is on suction, connect the suction tubing and dial it to the prescribed level.
Finally, document the time of the exchange, the volume drained in the old system, and the appearance of the drainage (serous, sanguineous, or purulent). Record the presence or absence of air leak and confirm that tidaling has resumed.
Why Connection Security Matters So Much
A disconnected chest tube is an open pathway between the atmosphere and the pleural space. In a patient with a pneumothorax or a bronchopleural fistula, even a brief disconnection can allow enough air in to cause clinical deterioration. The cross-taping method described above outperformed other approaches in a controlled evaluation, and the difference was statistically clear.2PubMed Central. How to secure the connection between thoracostomy tube and drainage system?
Beyond taping, a few practical habits reduce the risk of disconnection. Keep the drainage unit below the patient’s chest at all times, ideally on the floor or mounted to the bed frame at a low position. Avoid loops of dependent tubing where fluid can collect and create back-pressure. And when transporting the patient, pay particular attention to the connection point, since bed transfers and hallway bumps are when tubes most commonly pull apart.
Wet-Seal Versus Dry-Seal Systems
Atrium and other manufacturers produce both wet-seal and dry-seal drainage units, and the type you are swapping matters for the setup. In a wet-seal system, the water-seal chamber uses a column of sterile water (typically 2 cm) as a one-way valve: air can bubble out of the pleural space through the water, but atmospheric air cannot pass back in. The water level needs to be correct before you connect the patient. If the level drops from evaporation or spillage during use, the seal becomes unreliable.
Dry-seal systems use a mechanical one-way valve instead. There is no water to manage, which eliminates one variable during a system change and makes accidental spillage a non-issue. A hydrodynamic comparison of different system types found that under normal conditions, dry, wet, and single-chamber systems achieve similar air flow rates. However, when air leaks are present, dry systems tend to maintain their set negative pressure more reliably than wet systems, which can lose water through evaporation at higher suction settings and become pressure-unstable as a result.3PubMed. A hydrodynamic study of pleural drainage systems: some practical consequences If you are caring for a patient with a persistent air leak, this stability advantage may influence your unit selection.
For practical purposes during a system change, the key difference is that a wet-seal unit requires you to pre-fill the chamber and verify the water level, while a dry-seal unit is essentially ready out of the box. Both types still demand a prompt, well-taped connection and immediate unclamping.
What to Monitor After the Exchange
The first few minutes after reconnection are when problems become apparent. Tidaling in the water-seal chamber should resume immediately. If it does not, something is wrong: either the tube is kinked, blocked with a clot, or not properly connected. Check the entire length of tubing from the patient to the drainage unit.
An air leak that was not present before the exchange suggests a connection problem. Systematically check from the drainage unit upward: is the suction tubing properly seated? Is the chest tube-to-unit connection tight? Is there a crack in the new drainage chamber? Only after ruling out system causes should you consider a new pleural air leak.
Subcutaneous emphysema, the crackling sensation of air trapped under the skin, can signal that the drainage system is not evacuating air effectively. This complication is associated with tube blockage, poor tube positioning, and side-port migration. Patients who develop it tend to have longer hospital stays and higher mortality, so new or worsening subcutaneous emphysema after a system change warrants immediate investigation.4PubMed. Subcutaneous emphysema associated with chest tube drainage In many cases, the issue is not the new drainage unit itself but a tube that has shifted position during handling.
Special Considerations for Autotransfusion Systems
Some Atrium drainage systems, such as the Atrium Ocean, include autotransfusion capability. These units are designed for postoperative settings, particularly cardiac surgery, where reinfusing the patient’s own shed blood can reduce the need for donor blood products. The system allows collected blood to be returned to the patient through a standard 40-micron microemboli filter without the need for washing or component separation.5Health Research Authority. Does using the Atrium Ocean™ 2050 chest drain autotransfusion system reduce postoperative allogenic blood product use in elective single valve replacement procedures?
When changing an autotransfusion-capable unit, the process adds a few wrinkles. If blood has been collected and autotransfusion is planned, the collection bag needs to be processed or infused before the system is swapped, or it must be detached and handled separately according to the manufacturer’s instructions. You cannot simply disconnect a full autotransfusion bag and set it aside indefinitely; the blood has a limited window for safe reinfusion. If autotransfusion is not being used, the change proceeds like any standard drainage system swap.
Common Mistakes and How to Avoid Them
Clamping the chest tube and then getting distracted is the single most dangerous error. Interruptions happen in clinical settings, and a clamped chest tube in a patient with a continuing air leak can produce a tension pneumothorax in minutes. If you are interrupted mid-procedure, delegate someone to monitor the patient or unclamp the tube and restart the exchange later.
Another common error is forgetting to pre-fill the water-seal chamber in a wet-seal system. Connecting the patient to a dry water-seal chamber means there is no one-way valve in place; air can flow freely in both directions. This is easily prevented by making the fill step part of your setup routine before you approach the bedside.
Reusing old tape or applying tape loosely because “it’s just temporary” is a setup for accidental disconnection. Always apply fresh tape using the cross-taping technique, and apply it as if the patient will be getting up and moving around, because in many cases they will be.
Finally, not recording the output from the old system creates a gap in the clinical record. The volume and character of chest tube drainage are used to make decisions about tube removal, surgical intervention, and transfusion. If you swap the system and do not document what was in the old one, the next clinician loses critical information.
How Modern Digital Drainage Units Are Changing the Workflow
The landscape of chest drainage has evolved considerably from the glass-bottle systems of earlier decades. Modern units can incorporate digital monitoring that continuously tracks pleural pressure and air leak status, graphing trends over time rather than relying on a nurse’s periodic bedside assessment.6PubMed Central. Chest Tubes and Pleural Drainage: History and Current Status in Pleural Disease Management These digital systems can provide objective data that helps clinicians decide when a tube is ready for removal, potentially shortening the duration of drainage and reducing hospital stays.
Despite this, digital drainage systems remain a relatively small slice of the published research. A review of the literature found that among studies related to thoracic surgery drainage, only about 14% focused on digital drainage technology.7JTCVS Techniques. Quality Improvement in Chest Tube Management: An Updated Review The evidence base is growing, but most clinical settings still rely on traditional analog units. When changing a digital drainage system, the procedure itself is largely the same: clamp, disconnect, reconnect, unclamp, verify. The added step is ensuring the new unit’s digital components are powered, calibrated, and connected to any bedside monitoring system in use.
When the Tube Itself Is the Problem
Sometimes a system change does not fix the issue because the problem is with the chest tube rather than the drainage unit. Tubes can become kinked, blocked by fibrin or blood clot, or malpositioned so that a side port migrates out of the pleural space. All of these conditions impair drainage and can produce complications including subcutaneous emphysema, re-accumulation of fluid or air, and infection.4PubMed. Subcutaneous emphysema associated with chest tube drainage If drainage does not resume normally after a system change and you have confirmed the new unit is functioning, a chest X-ray to check tube position is the standard next step.
Active tube clearance, which involves using specialized devices to strip fibrin and clot from inside the tube, has gained attention in cardiac surgery settings. The research literature reflects this: among studies focused on chest drainage after cardiac surgery, more than a third addressed active tube clearance techniques.7JTCVS Techniques. Quality Improvement in Chest Tube Management: An Updated Review Traditional “milking” or “stripping” of chest tubes by hand is controversial and can generate dangerously high negative pressures, so many institutions have moved toward purpose-built clearance devices that maintain patency without the pressure spikes.
Distinguishing between a system problem and a tube problem saves time and prevents unnecessary interventions. A methodical approach, checking the drainage unit first, then the tubing and connections, and finally the tube position, keeps you from swapping a perfectly good unit when the real issue is a kinked tube caught under the patient’s body.