Pneumothorax nursing reference: types, assessment, and interventions

A pneumothorax is the presence of air in the pleural space — the normally airtight cavity between the visceral and parietal pleura. When air enters, the negative intrapleural pressure that holds the lung expanded is disrupted, and the lung collapses fully or partially. Pneumothorax ranges from a minor incidental finding to an immediately life-threatening emergency requiring intervention within minutes.

For nursing students, three priorities stand out: recognizing the clinical difference between spontaneous, traumatic, and tension pneumothorax; understanding why tension pneumothorax demands intervention before any imaging; and managing chest tube drainage systems safely. This reference covers all three, along with pathophysiology, assessment findings, chest tube care, patient education, and NCLEX-style practice questions.

Pair this page with the pneumonia nursing reference, pleural effusion nursing reference, pulmonary embolism nursing reference, and ARDS nursing reference — all four conditions can coexist with or be complicated by pneumothorax.

Types of pneumothorax

Primary spontaneous pneumothorax

Primary spontaneous pneumothorax (PSP) occurs without underlying lung disease. The typical patient is a young (ages 18–40), tall, thin male. The mechanism is rupture of a subpleural bleb — a small air-filled sac that forms on the visceral pleura, most commonly at the lung apex. Blebs may form due to uneven mechanical stress at the apex during lung development. Smoking is a significant risk factor, increasing the incidence roughly 20-fold compared with nonsmokers.

PSP carries a 5-year recurrence rate of approximately 30% ipsilateral; bilateral occurrence is uncommon but possible. A first episode is typically managed conservatively if the pneumothorax is small (less than 2–3 cm rim on CXR) and the patient is hemodynamically stable.

Secondary spontaneous pneumothorax

Secondary spontaneous pneumothorax (SSP) occurs in patients with known lung disease. The underlying disease weakens lung architecture, making bleb and bulla formation more likely. Common underlying conditions include:

• COPD / emphysema — the most common cause of SSP; bullae form as alveolar walls are destroyed
• Cystic fibrosis (CF) — recurrent infection and airway obstruction create structural weaknesses
• Marfan syndrome — connective tissue abnormality affects pleural integrity
• Tuberculosis (TB) — cavitary lesions and fibrosis predispose to air leak
• Malignancy — tumor necrosis can erode into the pleural space
• Pneumocystis jirovecii pneumonia (PJP) — particularly in immunocompromised patients

SSP patients tolerate collapse poorly because their underlying lung disease has already reduced respiratory reserve. A small SSP can produce severe symptoms requiring urgent intervention. The ACCP recommends chest tube placement and pleurodesis after the first episode of SSP to prevent recurrence.

Traumatic pneumothorax

Traumatic pneumothorax follows chest wall injury — either blunt trauma (motor vehicle crashes, falls) or penetrating injury (stab wounds, gunshot wounds, impalement). Rib fractures can lacerate the visceral pleura; penetrating wounds create a direct opening between the outside environment and the pleural space.

A key subtype is open pneumothorax (sucking chest wound), where a chest wall defect allows air to enter during inspiration through the wound rather than through the trachea. Standard field management is a 3-sided occlusive dressing, which acts as a flutter valve: seals on inspiration to prevent air entry, opens on expiration to allow air escape. A completely sealed dressing can convert an open pneumothorax to a tension pneumothorax.

Traumatic pneumothorax frequently coexists with hemothorax (blood in the pleural space) — together called hemopneumothorax.

Iatrogenic pneumothorax

Iatrogenic pneumothorax occurs as a complication of a medical procedure that inadvertently punctures the visceral pleura. Common causes include:

• Central venous catheter (CVC) insertion — particularly subclavian and internal jugular approaches
• Thoracentesis — the most common complication of this procedure (~6% risk)
• Lung or pleural biopsy
• Mechanical ventilation — barotrauma from high pressures (volutrauma/barotrauma), especially in ARDS patients with stiff lungs

Post-procedure CXR is standard after CVC insertion and thoracentesis specifically to detect iatrogenic pneumothorax.

Tension pneumothorax

Tension pneumothorax is the most dangerous type and a true emergency. A one-way valve mechanism develops — air enters the pleural space during inspiration but cannot escape during expiration. With each breath, more air accumulates, and intrapleural pressure rises progressively. This leads to:

1. Progressive collapse of the ipsilateral lung
2. Mediastinal shift away from the affected side
3. Compression of the contralateral lung (reducing total ventilation)
4. Compression of the superior and inferior vena cava, reducing venous return
5. Obstructive shock — cardiac output drops, blood pressure falls

Tension pneumothorax can arise from any type of pneumothorax, but is most commonly seen with penetrating trauma, positive-pressure mechanical ventilation, and improperly managed open chest wounds.

Pathophysiology

Simple pneumothorax

Under normal conditions, intrapleural pressure is negative (approximately −5 cmH₂O at rest, −8 cmH₂O during inspiration). This negative pressure keeps the visceral and parietal pleura apposed and maintains lung expansion. When air enters the pleural space — from any cause — this gradient is disrupted. The lung’s inherent elastic recoil causes it to collapse inward.

Physiologic consequences of lung collapse:

• Reduced tidal volume on the affected side — the collapsed lung cannot participate in gas exchange
• Ventilation-perfusion (V/Q) mismatch — blood continues to perfuse the collapsed lung (perfusion without ventilation = intrapulmonary shunt), causing hypoxemia
• Compensatory tachypnea — the patient breathes faster to maintain minute ventilation
• Hypoxemia and hypercapnia — worsen as the degree of collapse increases

Tension pneumothorax physiology

In tension pneumothorax, the ongoing accumulation of air under positive pressure produces mediastinal shift — the heart, trachea, and great vessels are pushed toward the unaffected side. Tracheal deviation is a late and unreliable sign: by the time the trachea shifts visibly, the patient is in extremis. Do not wait for tracheal deviation to act.

The hemodynamic collapse of tension pneumothorax follows from:

1. Increased intrathoracic pressure → compresses the vena cava → reduces preload → drops cardiac output
2. Mediastinal shift → kinks the great vessels → further reduces venous return
3. Hypoxemia → hypoxic vasoconstriction → further increases pulmonary vascular resistance

The result is obstructive shock — tachycardia, hypotension, cyanosis, and impending cardiac arrest if untreated.

Clinical presentation

Cardinal signs of tension pneumothorax

The classic teaching triad is: absent breath sounds (ipsilateral) + tracheal deviation (contralateral) + hypotension. However, this triad is a late-stage picture. In practice:

• Absent breath sounds unilaterally — the most reliable early sign; assess with auscultation before imaging
• Tracheal deviation — a late sign, present only when mediastinal shift is severe; do not wait for it
• Hypotension + tachycardia — indicate cardiovascular compromise; signal obstructive shock
• Jugular venous distension (JVD) — elevated venous pressure from impaired venous return; may be absent in hypovolemic patients
• Respiratory distress — tachypnea, accessory muscle use, cyanosis, decreasing oxygen saturation
• Agitation or altered mental status — from hypoxia and reduced cerebral perfusion

In mechanically ventilated patients: sudden rise in peak airway pressures, decreased compliance, declining SpO₂, and hemodynamic instability are the key warning signs — these patients cannot communicate symptoms.

Diagnosis and assessment

Clinical assessment

Nursing assessment starts with the ABCs. For suspected pneumothorax:

1. Auscultation — compare breath sounds bilaterally. Diminished or absent sounds on one side with pleuritic chest pain strongly suggest pneumothorax. In tension pneumothorax, breath sounds may be completely absent ipsilaterally.
2. Percussion — hyperresonance over the affected lung (air-filled pleural space rather than air-filled alveoli)
3. Inspection — unequal chest rise, accessory muscle use, tracheal position
4. Vital signs — tachycardia and falling SpO₂ are early warning signs; hypotension indicates progression toward tension

For tension pneumothorax: if clinical assessment strongly suggests tension PTX in a hemodynamically unstable patient, do NOT wait for imaging. Proceed to immediate needle decompression (see Emergency Management below).

Chest X-ray

CXR is the standard diagnostic imaging for stable patients:

• Absent lung markings over the affected area — the collapsed lung creates a hyperlucent (darker) zone without vascular markings
• Visible pleural line — the edge of the collapsed lung is visible as a white line separated from the chest wall
• Deep sulcus sign — on supine CXR (common in trauma), air collects anteriorly and inferiorly, producing a deep, lucent costophrenic angle; may be the only sign on an AP supine film
• Tracheal deviation — contralateral shift indicates significant tension
• Mediastinal shift — heart and mediastinum displaced away from affected side in tension

CXR can underestimate the size of a pneumothorax, particularly on supine films. A pneumothorax may appear small on CXR but be clinically significant.

CT scan

CT is more sensitive than CXR and can detect small pneumothoraces invisible on plain film. CT is indicated when:

• CXR is inconclusive and clinical suspicion is high
• Evaluating the extent of injury in chest trauma
• Planning surgical intervention
• The patient is stable and has underlying lung disease (accurately measuring size of SSP)

Do NOT delay treatment for CT if the patient is hemodynamically unstable.

ABG and pulse oximetry patterns

• SpO₂ — decreases as V/Q mismatch worsens; normal early in small pneumothorax
• PaO₂ — decreased; the degree of hypoxemia correlates roughly with the extent of collapse
• PaCO₂ — often normal or slightly decreased early (hyperventilation compensates); rises if respiratory fatigue sets in
• pH — respiratory alkalosis early; respiratory acidosis if fatigue or tension develops

Emergency management — tension pneumothorax

The critical decision: treat before imaging

Tension pneumothorax is a clinical diagnosis. In a hemodynamically unstable patient with clinical signs of tension pneumothorax, do NOT delay treatment to obtain a chest X-ray. Perform immediate needle decompression.

The rationale: tension pneumothorax can cause cardiac arrest within minutes. The time required to transport a patient to radiology, perform CXR, interpret results, and return to the bedside may be fatal. A false-positive needle decompression (treating a non-tension pneumothorax with needle decompression) causes a simple iatrogenic pneumothorax — a manageable complication. A missed tension pneumothorax causes death.

Decision algorithm

Patient with respiratory distress + chest symptoms
              ↓
Auscultate: Unilateral absent breath sounds?
              ↓ YES
Is the patient hemodynamically unstable?
(Hypotension, tachycardia, declining SpO₂)
         ↓ YES              ↓ NO
TENSION PNEUMOTHORAX     SIMPLE PNEUMOTHORAX
IMMEDIATE NEEDLE          → Obtain CXR
DECOMPRESSION             → Stable: size-based
Do NOT wait for CXR          management
         ↓
Follow with chest tube
(needle is temporary)

Needle decompression technique

The current ATLS (10th edition) recommended site is the 4th or 5th intercostal space just anterior to the anterior axillary line (ICS 4/5-AAL) — this site has replaced the traditional 2nd intercostal space midclavicular line (ICS 2-MCL) recommendation in the most recent guidelines due to higher success rates and reduced risk of injury to the internal mammary artery. Some guidelines (European Trauma Course) still recommend ICS 2-MCL. Many practitioners use ICS 2-MCL in the field when the 4th/5th ICS site is difficult to access.

Procedure:

1. Identify the correct intercostal space
2. Insert a 14–16 gauge over-the-needle catheter (angiocath), at least 8 cm long, into the superior border of the rib (avoids the neurovascular bundle running inferior to each rib)
3. A rush of air confirms decompression
4. Remove the needle, leave the catheter in place
5. Secure the catheter and prepare for definitive chest tube insertion

Note: Needle decompression is a temporizing measure. It relieves tension but does not maintain pleural drainage. Definitive management requires chest tube insertion.

Chest tube for pneumothorax

Tube thoracostomy (chest tube) provides continuous pleural drainage:

• Size — pneumothorax without hemothorax: a smaller-bore tube (20–28 Fr) is appropriate; hemopneumothorax requires large-bore (32–40 Fr) to drain blood
• Location — 4th or 5th intercostal space, anterior axillary line (safe triangle); apex of the lung (2nd ICS MCL) for pure pneumothorax in some practice settings
• Connected to a water seal drainage system (Pleur-evac or Atrium)

Chest tube management

Water seal drainage system components

A chest drainage system (Pleur-evac, Atrium) has three functional chambers:

1. Collection chamber — collects blood, fluid, or air draining from the pleural space; mark fluid level hourly in acute situations, or every shift in stable patients
2. Water seal chamber — acts as a one-way valve; filled with sterile water to the 2 cm mark; allows air to exit the pleural space but prevents backflow into the patient
3. Suction control chamber — regulates the amount of negative pressure applied; wet suction systems are set by the water level (typically −20 cmH₂O); dry suction systems use a dial

Monitoring the water seal chamber

Clamping rules

Do NOT clamp a chest tube if an air leak is present. Clamping with an active air leak traps air in the pleural space and can cause or worsen a tension pneumothorax. Legitimate indications for brief clamping include: evaluation of whether a persistent air leak is from the system or the patient (clamp briefly at the chest wall — if bubbling stops, the leak is distal in the system), or during accidental disconnection while reconnecting. Clamping should be brief and supervised only.

Drainage output monitoring

• Document drainage amount and color every hour in the acute setting, every shift when stable
• Bloody output >100–200 mL/hour warrants immediate provider notification — suggests hemothorax or active hemorrhage
• Expected output is serosanguinous and gradually decreasing
• Do not allow the collection chamber to fill completely — change before it reaches capacity

Chest tube removal criteria

The chest tube can generally be removed when:

• Air leak has resolved (no bubbling in the water seal chamber for 12–24 hours)
• Lung is fully re-expanded on CXR
• Drainage is minimal (typically <100–150 mL/day, or per provider criteria)
• Patient is hemodynamically stable

During removal, instruct the patient to perform a Valsalva maneuver (bear down) or take a deep breath and hold — this raises intrathoracic pressure and reduces the risk of air entry during tube removal.

Nursing interventions

Positioning

• Semi-Fowler’s position (30–45 degrees) — the standard position for comfort and respiratory efficiency; uses gravity to expand the lower chest and reduces work of breathing
• Affected side down — sometimes ordered for stable spontaneous pneumothorax because it may improve V/Q matching by preferentially directing ventilation to the unaffected lung
• Avoid positions that increase respiratory demand — restrict activity until the lung has re-expanded

Oxygen therapy

Supplemental oxygen accelerates the reabsorption of pleural air. At room air, pleural nitrogen absorption is slow. High-flow oxygen (10–15 L/min via non-rebreather mask) creates a diffusion gradient that speeds nitrogen absorption from the pleural space by a factor of approximately 4. This is the rationale for high-flow O₂ in patients with small pneumothorax being managed conservatively.

Monitoring priorities

Emergency preparedness

Keep at the bedside for any patient with a chest tube or high risk for tension pneumothorax:

• Needle decompression supplies (14–16 g angiocath, 8 cm length minimum)
• Occlusive dressing materials (for open chest wound coverage)
• Extra chest tube drainage system
• Suction setup and functioning
• Emergency call system immediately accessible

Pain management

Pleuritic chest pain impairs deep breathing and coughing, increasing the risk of atelectasis and secretion retention. Adequate analgesia is a nursing priority. Approaches include:

• Scheduled non-opioid analgesics (acetaminophen, NSAIDs) as baseline
• Opioid analgesia for moderate-to-severe pain, particularly post-chest tube insertion
• Pillow splinting support when coughing
• Patient-controlled analgesia (PCA) in the post-procedure period for larger chest tubes

Patient education

Before discharge, patients need to understand the following:

Recurrence risk

• Primary spontaneous pneumothorax: approximately 30% ipsilateral recurrence risk within 5 years; risk is higher in the first year
• Secondary spontaneous: higher recurrence (approaching 43% with SSP), and each recurrence in a patient with underlying lung disease carries greater risk
• Patients who have had two or more spontaneous pneumothoraces on the same side are generally referred for definitive surgical intervention (VATS with mechanical pleurodesis)

Smoking cessation

Smoking is a major modifiable risk factor. Continuing to smoke after a primary spontaneous pneumothorax dramatically increases recurrence risk. Frame cessation as the single most impactful thing the patient can do to prevent recurrence.

Activity and air travel restrictions

• Avoid strenuous exertion until lung re-expansion is confirmed (typically 2–4 weeks)
• Air travel — avoid commercial flights for at least 2 weeks after full resolution (confirmed by CXR); altitude decreases cabin pressure, which can expand residual air pockets. Some guidelines recommend 6 weeks. Patients should be cleared by their provider.
• Scuba diving — permanently contraindicated after spontaneous pneumothorax unless definitive surgical treatment (VATS + pleurodesis) has been performed; pressure changes at depth are dangerous
• Contact sports — avoid until medically cleared

When to return to the emergency department

Return immediately if:

• Sudden worsening chest pain or difficulty breathing
• Rapidly increasing shortness of breath
• Lips or fingernails turning blue
• Feeling faint or losing consciousness

NCLEX-style practice questions

Question 1. A nurse is caring for a patient admitted after a motor vehicle collision. On assessment: absent breath sounds on the left, tracheal deviation to the right, blood pressure 82/54 mmHg, heart rate 128 bpm, and SpO₂ 82% on high-flow oxygen. What is the nurse’s priority action?

A. Obtain a STAT portable chest X-ray B. Prepare the patient for chest tube insertion C. Notify the provider and prepare for immediate needle decompression D. Administer a 1-liter normal saline bolus

Answer: C. This patient has classic signs of tension pneumothorax: absent unilateral breath sounds, tracheal deviation away from the affected side, hypotension, and severe hypoxia. Tension pneumothorax is a clinical diagnosis requiring immediate needle decompression — waiting for a chest X-ray (Option A) delays life-saving treatment. Chest tube insertion (Option B) is definitive management but comes after needle decompression. Fluid bolus (Option D) will not address the obstructive cause of hypotension.

Question 2. A nurse is monitoring a patient’s chest tube drainage system after insertion for a left pneumothorax. The water in the water seal chamber is fluctuating up with inspiration and down with expiration. How should the nurse interpret this finding?

A. The chest tube is kinked and requires repositioning B. There is an air leak in the drainage system C. The lung has fully re-expanded D. The chest tube is patent and functioning normally

Answer: D. Tidaling — the rise and fall of water in the water seal chamber with respiratory effort — is a normal finding indicating the tube is patent and communicating with the pleural space. Loss of tidaling (not the presence of it) would suggest the tube is obstructed or the lung has re-expanded.

Question 3. A patient with COPD suddenly develops severe dyspnea and right-sided pleuritic chest pain. Breath sounds are absent over the right upper and middle lung fields. The nurse suspects secondary spontaneous pneumothorax. Which intervention does the nurse anticipate?

A. Administer bronchodilators and supplemental oxygen; observe for 4 hours B. Prepare for chest tube insertion C. Position the patient prone and apply continuous cardiac monitoring D. Prepare the patient for thoracentesis using a lateral decubitus position

Answer: B. Secondary spontaneous pneumothorax in a patient with COPD is a serious event requiring active intervention. COPD patients have severely limited respiratory reserve, so a pneumothorax that might be managed conservatively in a healthy young adult (primary spontaneous) requires chest tube drainage in a patient with COPD. The ACCP recommends chest tube placement for all patients with secondary spontaneous pneumothorax. Observation alone (Option A) is appropriate only for small primary spontaneous pneumothorax. Prone positioning (Option C) is used in ARDS management. Thoracentesis (Option D) is for pleural effusion, not pneumothorax.

Question 4. A nurse notices continuous bubbling in the water seal chamber of a patient’s chest tube system approximately 8 hours after insertion. The bubbling was intermittent earlier in the shift. What should the nurse do first?

A. Clamp the chest tube and notify the provider immediately B. Assess all tubing connections for tightness and check the insertion site C. Document the finding and continue monitoring D. Increase the suction pressure to clear the air leak

Answer: B. Continuous bubbling indicates an air leak — either a persistent pneumothorax (patient-side) or a leak in the external system (connection or insertion site). The first step is to systematically check connections and the insertion site. Clamping (Option A) is dangerous if the air leak is from the patient — it traps air in the pleural space and can cause tension pneumothorax. Documenting only (Option C) is insufficient without investigation. Increasing suction (Option D) does not address the source of the leak.

Question 5. A nurse is preparing to care for a patient with a chest tube connected to wall suction at −20 cmH₂O. The nurse notes that there is no bubbling in the suction control chamber of a wet suction system. Which action is appropriate?

A. Increase the wall suction until continuous gentle bubbling is present in the suction control chamber B. Notify the provider that the suction is not functioning C. Document the finding — this is normal for a dry suction system D. Remove the chest tube, as the absence of bubbling indicates the lung has re-expanded

Answer: A. In a wet suction chest drainage system, the level of bubbling in the suction control chamber confirms that suction is being applied. Gentle continuous bubbling is the expected finding; absence of bubbling in a wet system indicates insufficient suction. The nurse should increase wall suction until gentle bubbling appears. Note: this question specifically describes a wet suction system — dry systems (such as the Atrium Oasis) use a dial and do not rely on bubbling in the suction chamber.

Question 6. A patient is being discharged after treatment for a primary spontaneous pneumothorax. The nurse is providing discharge education. Which statement by the patient indicates a need for further teaching?

A. “I should come back to the emergency department immediately if I have sudden chest pain or trouble breathing.” B. “I need to avoid flying for at least two weeks until my doctor clears me.” C. “Since my lung is fully healed now, I can go back to scuba diving in a few months.” D. “Quitting smoking will reduce my chance of having another one of these.”

Answer: C. Scuba diving after spontaneous pneumothorax is permanently contraindicated unless definitive surgical treatment (VATS with pleurodesis) has been performed. The pressure changes during descent can expand residual blebs and cause recurrence in an environment where emergency decompression is impossible. Options A, B, and D are all correct patient education points.

Key takeaways for NCLEX

• Tension pneumothorax is a clinical diagnosis — treat before imaging
• Tracheal deviation is a late sign; absent breath sounds + hypotension in context of chest trauma is enough to act
• Continuous bubbling = air leak (investigate; do not clamp)
• Tidaling = normal (tube patent); no tidaling = obstruction or re-expansion
• Never clamp a chest tube with an active air leak
• COPD + pneumothorax = secondary spontaneous = chest tube, not observation
• Scuba diving: permanently contraindicated after spontaneous PTX without surgical repair

Sources: StatPearls — Acute Pneumothorax Evaluation and Treatment (NBK538316); StatPearls — Tension Pneumothorax (NBK559090); StatPearls — Care of a Chest Tube (NBK556088); StatPearls — Spontaneous Pneumothorax (NBK459302); ATLS 10th Edition (American College of Surgeons); British Thoracic Society Guidelines for Spontaneous Pneumothorax; ACCP Consensus Statement on Spontaneous Pneumothorax; PMC article on meta-analysis of needle decompression sites (PMC12087068).