Medical-Surgical Nursing · Gas Exchange, Airway Management, and Respiratory System Disorders
Disorders of the Lower Respiratory System: Pneumothorax
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In 30 seconds
A Pneumothorax Air in the pleural space causing partial or complete lung collapse Full entry → is air in the pleural space — the normally air-free, lubricated gap between the lung's covering (visceral pleura) and the chest wall's lining (parietal pleura). That space normally sits at slight negative pressure, which helps keep the lungs expanded against the chest wall. When air gets in, the negative pressure is lost and the lung partially or completely collapses; the bigger the leak, the less surface area remains for gas exchange.
Pneumothorax is best understood by how the air got there, which determines severity and treatment:
- Spontaneous — no injury. Primary occurs in people without known lung disease (a commonly taught pattern is tall, thin young adults); secondary complicates lung disease such as COPD or cystic fibrosis and is more dangerous because the lung is already compromised.
- Traumatic — air enters through injury: a penetrating wound that opens the chest wall, or blunt trauma that ruptures lung tissue.
- Iatrogenic — air introduced by a procedure (central line placement, biopsy) or mechanical ventilation.
- Tension — the emergency form: a one-way valve lets air in but not out, so pressure builds, pushes the heart and trachea to the opposite side (mediastinal shift), and compresses the other lung and the veins returning blood to the heart.
Why this matters
- Some pneumothoraces are emergencies. Tension pneumothorax One-way-valve air entry with rising pressure and mediastinal shift Full entry → kills quickly; the nurse's recognition of sudden respiratory distress, asymmetry, and shift triggers the response that saves the life.
- Chest tube care is a classic nursing responsibility. After placement (a provider procedure), the nurse monitors the drainage system and recognizes when it is failing.
- It tests respiratory assessment: decreased or absent breath sounds, hyperresonance, and asymmetric chest movement are findings every nurse must name and report. It connects to the chapter: people with COPD (Topic 5) are at higher risk of secondary spontaneous pneumothorax, and Topic 2 assessment skills detect it.
The college version
Core Concepts
Types and mechanisms
- Primary spontaneous: a small bleb (blister) on the lung surface ruptures; no underlying lung disease. Commonly taught associations (tall, thin habitus; smoking) are patterns, not rules.
- Secondary spontaneous: existing lung disease (COPD with bullae, cystic fibrosis, infection, malignancy) provides the weak spot; even a small collapse can cause severe hypoxia.
- Traumatic: penetrating injuries breach the chest wall directly; blunt force can fracture ribs that tear the lung. An "open" (sucking) chest wound lets air move in and out with each breath.
- Iatrogenic: procedures that pierce the pleura — central line insertion, thoracentesis, lung biopsy — occasionally admit air; mechanical ventilation under high pressures can also rupture lung tissue.
Tension pneumothorax: the one-way valve
In tension physiology, tissue acts as a flap valve: air enters during inspiration, then the flap closes during expiration so none can escape. Pressure shoves the mediastinum to the opposite side, compresses the healthy lung, and impairs venous return, dropping cardiac output. Clinically this appears as rapid deterioration: severe dyspnea, distress, cyanosis, and often tracheal deviation away from the affected side — a late but classic sign. Tension is an emergency treated by decompression (needle decompression or chest tube), performed by the provider; the nurse's role is recognition, immediate escalation, and preparation.
Assessment findings
The classic picture: sudden onset of pleuritic chest pain (sharp, worse with breathing) and dyspnea; on the affected side, decreased or absent breath sounds, hyperresonance to percussion, and reduced chest wall movement. Tachycardia and low oxygenation may follow. Diagnosis is usually confirmed by imaging (commonly a chest x-ray); the nurse's contribution is the physical findings and the story.
Chest tubes and nursing care
For larger or symptomatic pneumothoraces, the provider inserts a chest tube connected to a sealed drainage system that removes air and restores negative pressure. Nursing care centers on the system:
- Keep the system intact, upright, and below the level of the chest so fluid drains and does not backflow; keep tubing free of kinks and dependent loops.
- Monitor the water seal chamber: gentle bubbling may indicate air being evacuated, and tidaling (the water level rising and falling with breathing) can be normal — but continuous vigorous bubbling or a sudden change signals a persistent air leak and must be reported.
- Observe drainage for amount, color, and sudden changes; never clamp a chest tube without a specific order, because clamping can convert a draining pneumothorax into a trapped one; check the insertion site for bleeding, drainage, subcutaneous air (commonly taught as crepitus), and a secure dressing.
Scope note: insertion, removal, and suction settings are provider responsibilities; the nurse's role is surveillance, maintenance, documentation, and prompt reporting, per institutional policy.
Common Confusions
| Do not confuse | With | Difference |
|---|---|---|
| Pneumothorax | Hemothorax | Pneumothorax is air in the pleural space; hemothorax is blood. Both collapse the lung; mechanisms and management differ |
| Simple pneumothorax | Tension pneumothorax | Simple = stable air; tension = one-way valve with rising pressure, mediastinal shift, falling cardiac output |
| Tracheal deviation toward the collapsed side | Deviation away from it | In tension, pressure pushes the trachea away from the affected side — a late sign, so never wait for it |
| Bubbling in the water seal | Always a problem | Gentle bubbling can be normal; continuous vigorous bubbling or sudden change = report |
| Clamping a chest tube for transport | Safe routine practice | Clamping without an order can trap air and worsen the pneumothorax — follow orders and policy |
| "Lungs clear, no wheeze" | Reassuring in pneumothorax | In a collapsed lung, breath sounds may be absent, not wheezy — quiet can mean collapsed |
Eli explains
The same idea, in plain words
Explain it like I’m 10
Your lung floats inside your chest like a balloon inside a jar, held open by gentle suction between the balloon and the jar wall. If air sneaks into that space — through a hole in the balloon or a hole in the jar — the suction is lost and the balloon flops down. Usually doctors put in a small drain tube to let the air out so the balloon can reinflate. If air keeps getting in but can't get out, it squeezes everything else, which is a true emergency.
Worked example
Simple. A 19-year-old student develops sudden sharp right-chest pain during a basketball game. The nurse finds decreased right-sided breath sounds, a hyperresonant percussion note, and diminished chest movement; recognizes the primary spontaneous pattern; applies oxygen per order; positions the student upright; and reports. Imaging confirms a moderate pneumothorax, and a chest tube is placed; the nurse manages the system and teaches the student what to watch for before discharge.
Tension. In the ICU, a ventilated patient with severe COPD suddenly deteriorates: oxygen saturation and blood pressure fall, breath sounds vanish on the left, and the trachea feels shifted right — the classic tension pattern. The nurse calls for immediate help and prepares equipment while the provider decompresses. One skill ran through both scenes: see the change, name it, escalate it.
Key takeaways
- Pneumothorax = air in the pleural space → loss of negative pressure → lung collapse.
- Classify by mechanism: spontaneous (primary/secondary), traumatic, iatrogenic — mechanism drives urgency.
- Tension pneumothorax is a one-way-valve emergency with mediastinal shift, falling cardiac output, and (late) tracheal deviation away from the affected side.
- Bedside findings on the affected side: decreased/absent breath sounds, hyperresonance, reduced chest expansion, pleuritic pain and dyspnea.
- Chest tube care: system below chest level, tubing unkinked, monitor water seal (tidaling normal; continuous vigorous bubbling = report), never clamp without an order.
- The nurse recognizes and escalates; the provider decompresses — scope varies by institution.
Check yourself
6 review questions from the chapter. Try each one, then open the answer.
What is the pleural space, and why does its negative pressure matter?
Show answer
The pleural space is the sealed, lubricated gap between visceral and parietal pleura; its negative pressure holds the lung against the chest wall, and air entry destroys that pressure and collapses the lung.
List the main ways air can enter the pleural space (classification by mechanism).
Show answer
Spontaneous (primary — no lung disease; secondary — underlying lung disease), traumatic (penetrating or blunt injury), and iatrogenic (procedures or ventilation). Tension is a physiologic complication, not a separate entry route.
What makes tension pneumothorax different from a simple pneumothorax, and what is the classic late sign?
Show answer
In tension, a one-way valve lets air in but not out, so pressure rises, shifting the mediastinum and impairing venous return; tracheal deviation away from the affected side is the classic (but late) sign — never wait for it.
Name four assessment findings on the affected side of a pneumothorax.
Show answer
Decreased or absent breath sounds, hyperresonance, reduced chest wall movement, plus sudden pleuritic pain and dyspnea; tachycardia and low oxygenation commonly follow.
Give three principles of chest tube care that a nurse would apply.
Show answer
Keep the system below chest level and upright; keep tubing free of kinks; monitor the water seal (report continuous vigorous bubbling); observe drainage and the site; never clamp without an order.
Why is a secondary spontaneous pneumothorax generally more dangerous than a primary one?
Show answer
Because the underlying lung is already diseased (e.g., COPD, cystic fibrosis), even a small collapse causes severe compromise, and re-expansion may be slower.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- Pneumothorax
- Air in the pleural space causing partial or complete lung collapse
- Tension pneumothorax
- One-way-valve air entry with rising pressure and mediastinal shift
- Chest tube / water seal
- Drain in the pleural space; the chamber that lets air out but not in
Sources & references
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