Chest Tube Management: Assessment, Drainage Systems, Troubleshooting, and When to Call the Provider

A chest tube is a hollow tube inserted through the chest wall into the pleural space — the potential space between the visceral pleura (covering the lung) and the parietal pleura (lining the chest wall). Normally this space contains only a thin film of serous fluid that allows the lung to slide during breathing. When air (pneumothorax), blood (hemothorax), fluid (pleural effusion), or pus (empyema) accumulates in this space, the lung cannot expand fully. A chest tube evacuates the unwanted air or fluid, restores negative intrapleural pressure, and allows the lung to re-expand. The key concept for nursing management: the pleural space is a negative-pressure environment. During normal breathing, intrapleural pressure is approximately -4 to -8 cmH2O (below atmospheric). This negative pressure is what keeps the lungs inflated — it pulls the lung outward against the chest wall. When the seal is broken (a stabbing wound, a ruptured bleb, a post-surgical air leak), atmospheric air rushes in, the negative pressure is lost, and the lung collapses. The chest tube re-establishes the seal by providing a one-way exit for air and fluid — things can drain out, but nothing can get back in. This is why the water seal chamber is essential: the 2 cm of water creates a one-way valve. Indications: traumatic pneumothorax or hemothorax (stab wound, rib fractures with lung puncture), spontaneous pneumothorax (a tall, thin 20-year-old who suddenly develops sharp chest pain and dyspnea — classic presentation of a ruptured bleb), post-surgical drainage (cardiac surgery, thoracic surgery), large pleural effusion causing respiratory compromise, tension pneumothorax (life-threatening emergency — the air keeps entering the pleural space with each breath but cannot exit, building pressure that shifts the mediastinum, compresses the heart, and causes hemodynamic collapse). NurseIQ includes chest tube assessment scenarios that test your ability to differentiate normal findings from emergencies. This content is for educational purposes only and does not constitute medical advice.

Modern chest tube drainage systems (Atrium, Pleur-Evac) are self-contained units with three chambers — understanding what each does is essential for assessment and troubleshooting. The collection chamber is where drainage accumulates. It is graduated in mL for measurement. Mark the drainage level at the beginning of each shift and at regular intervals. Normal drainage varies by indication: a post-cardiac-surgery patient may drain 100-200 mL/hr initially. A pneumothorax with a small pleural effusion may produce 50-100 mL over the first few hours and then taper. Sudden increase in drainage (especially bloody drainage exceeding 200 mL/hr) requires immediate provider notification — it may indicate active hemorrhage. The water seal chamber contains 2 cm of sterile water. This water acts as a one-way valve: air from the pleural space bubbles through the water and escapes, but atmospheric air cannot enter the pleural space because it would have to push back through the water column. Tidaling — the water level rising with inspiration and falling with expiration (in a spontaneously breathing patient) or the reverse in a mechanically ventilated patient — is a normal finding that indicates the system is connected to the pleural space and the tube is patent. Absence of tidaling may indicate the lung has re-expanded (good news) or that the tube is kinked, clamped, or obstructed (bad news). Always assess in context. Continuous bubbling in the water seal chamber indicates an air leak — air is escaping from the lung into the pleural space and exiting through the drainage system. Intermittent bubbling during coughing or deep breathing is common and often not clinically significant. Continuous, vigorous bubbling at rest suggests a significant air leak that the lung has not sealed. The provider needs to know about continuous air leaks because they may delay tube removal or indicate a persistent bronchopleural fistula. The suction control chamber (in wet suction systems) contains water filled to the prescribed level (typically -20 cmH2O). Gentle, continuous bubbling in the suction control chamber indicates the suction is functioning correctly — this is different from the air leak bubbling in the water seal chamber. Learn to distinguish the location of the bubbling: suction chamber bubbling = normal system function. Water seal chamber bubbling = air leak. Dry suction systems use a dial or regulator instead of water — they are quieter and easier to manage but the assessment principle is the same. NurseIQ includes drainage system interactive diagrams that test your understanding of each chamber's function.

Chest tube assessment should be performed every 1-2 hours for the first 24 hours, then every 4 hours once stable. The assessment follows a systematic approach — tube, system, patient. Tube assessment: check the insertion site for drainage, crepitus (subcutaneous emphysema — air leaking into the tissue around the site, which feels like Rice Krispies under the skin), and secure dressing. An occlusive dressing (petroleum gauze or a commercial chest tube dressing) should be intact. The tube should be secured with tape or a commercial securement device and positioned to prevent dependent loops — a loop of tube below the drainage unit creates a water trap that impedes drainage and can build back-pressure. Keep the tube running as straight as possible from the patient to the drainage unit, with the unit below the chest level. System assessment: check the water seal chamber for tidaling (present = tube patent). Check for bubbling (location determines meaning — water seal vs suction). Measure drainage volume, color, and consistency: serous (clear, straw-colored — normal for pleural effusion), sanguineous (bloody — expected post-surgery, concerning if increasing), serosanguineous (pink-tinged — common and typically not concerning), and purulent (thick, opaque, possibly malodorous — suggests empyema or infection). Report any sudden change in drainage character or volume. Patient assessment: respiratory rate, SpO2, lung sounds (compare the affected side to the unaffected side — improving breath sounds on the affected side indicate the lung is re-expanding), pain level (chest tubes are painful — adequate analgesia is not optional; assess before asking the patient to cough, deep breathe, or ambulate), and signs of tension pneumothorax (tracheal deviation away from the affected side, hypotension, distended neck veins, absent breath sounds on the affected side — this is an emergency). The question nurses ask most: should I milk or strip the tube? The answer: generally no. Tube stripping generates extremely high negative pressures (-300 to -400 cmH2O) that can damage lung tissue. Gentle milking (squeezing the tube between your fingers to dislodge a visible clot) is acceptable if the tube is clearly obstructed, but routine stripping is not recommended by most thoracic surgery guidelines. If drainage has stopped and you suspect obstruction, notify the provider rather than attempting to clear the tube yourself.

Chest tube emergencies are high-stakes and time-sensitive. Knowing the correct response for each scenario prevents the two worst outcomes: lung collapse from a disconnected system and tension pneumothorax from a clamped tube. Accidental disconnection (tube separates from the drainage system): this is the most common emergency. Immediately submerge the distal end of the chest tube in sterile water (or any clean water — a cup of water at the bedside) to maintain the water seal and prevent atmospheric air from entering the pleural space. Then reconnect to a new sterile drainage system. Do NOT clamp the tube during a disconnection — clamping prevents air from escaping the pleural space, which can convert a simple air leak into a tension pneumothorax. The only exception: momentary clamping to identify the source of an air leak (tube connection vs lung parenchyma), performed briefly and with continuous patient monitoring. Tube dislodgement (the tube comes out of the chest): this is a life-threatening emergency. Immediately cover the insertion site with a sterile occlusive dressing — petroleum gauze or plastic wrap taped on three sides (the untaped fourth side acts as a flutter valve, allowing air to escape during exhalation but preventing air entry during inhalation). Monitor vital signs, SpO2, and respiratory status continuously. Notify the provider immediately — the tube will need to be reinserted. Do NOT attempt to push the tube back in — it is no longer sterile and forcing it risks lung puncture. Large air leak (continuous, vigorous bubbling in the water seal): systematically check the system from the patient outward. First, check all tubing connections for looseness — tighten or replace connectors. Second, check the tubing itself for cracks or holes. Third, briefly clamp the tube close to the patient's chest (with the provider's awareness and while watching the patient's respiratory status) — if the bubbling stops, the leak is in the lung (expected in some cases, particularly post-surgical). If the bubbling continues with the tube clamped near the patient, the leak is in the system between the clamp and the drainage unit. Replace the tubing or unit. Obstruction (no tidaling, no drainage in a patient whose lung has not re-expanded): check for kinks in the tubing. Check for dependent loops. Check for visible clots at the tube or connections. If these are not the cause, the tube itself may be obstructed — notify the provider. Do NOT attempt aggressive stripping. The provider may order a chest X-ray to assess tube position and lung re-expansion, or may replace the tube. NurseIQ includes chest tube troubleshooting scenarios that test rapid decision-making for each of these emergencies.