Pneumothorax & Hemothorax – Lecture Map

Overview

• Pleural space can abnormally fill with:
  • Air → Pneumothorax
  • Blood → Hemothorax
• Both conditions compromise ventilation, oxygenation, and (in tension physiology or massive bleeding) cardiovascular stability.
• Both are considered emergencies requiring rapid recognition, collaborative management, and vigilant nursing care.

Pathophysiology of Pneumothorax

• Normal pleural space maintains $\approx -8\,\text{cm H}_2\text{O}$ (sub-atmospheric) pressure → keeps visceral pleura "suctioned" to parietal pleura → lungs remain expanded.
• Pneumothorax = air gains entry into pleural space → intrapleural pressure equilibrates toward atmospheric ( $\approx 0\,\text{cm H}_2\text{O}$ ) → lung recoils and collapses partially or completely on affected side.
• Routes of entry of air/fluid:
  • Disruption of chest wall/ parietal pleura (open wound, invasive procedure).
  • Alveolar rupture (blebs, barotrauma) allowing air to track along bronchovascular sheaths into pleural space.
• Tension variant:
  • A flap‐valve mechanism permits air to enter during inspiration but traps it during expiration.
  • Progressive intrathoracic pressure rises above atmospheric, compressing ipsilateral lung, shifting mediastinum, kinking vena cavae → obstructive shock.
  • Rapidly fatal if not decompressed.

Classification of Pneumothorax

• Traumatic
  • Blunt (e.g., steering wheel impact) or penetrating (knife, bullet).
  • May coexist with rib fractures, pulmonary contusions, hemothorax.
• Open ("sucking" chest wound)
  • Air moves freely in and out of defect; classic presentation "You suck – you blow" sound.
  • Risk for tension if wound seals on expiration.
• Iatrogenic
  • Caused by medical procedures: central-line placement, thoracentesis, mechanical ventilation with high PEEP, transthoracic needle biopsies, barotrauma in ARDS.
• Spontaneous
  • Primary (PSP): occurs without underlying lung disease, often due to rupture of apical subpleural blebs.
  • Secondary (SSP): occurs in presence of lung pathology (COPD, cystic fibrosis, interstitial lung disease, tuberculosis).

Tension Pneumothorax – Key Points

• Pathognomonic features:
  • Severe dyspnea
  • Tracheal deviation away from affected side
  • Hyperresonance to percussion
  • Profound hypoxia, hypotension, distended neck veins (in non-hypovolemic pt).
• Immediate treatment:
  • Needle decompression with large-bore ( $\ge 14\text{G}$ ) over-the-needle catheter in the 2nd intercostal space, mid-clavicular line (ICS2-MCL) or alternative 4th/5th ICS anterior axillary line.
  • Follow with tube thoracostomy (chest tube) for definitive management.

Etiology & Risk Factors for Pneumothorax

• Modifiable
  • Cigarette smoking (increases PSP risk $\approx 20\times$ ).
  • Recreational drug inhalation (cannabis, crack).
  • High-altitude or deep-sea activities (pressure changes).
• Non-modifiable / Genetic
  • Family history, Marfan, Ehlers-Danlos, alpha-1 antitrypsin deficiency.

Epidemiology (From Slides)

• PSP: predominately male, ages $20–30\,\text{y}$.
• SSP: tends to occur in older adults $60–65\,\text{y}$ with chronic lung disease.

Impact of Aging on Respiratory System

• Rigid thoracic cage (calcified costal cartilages).
• Decreased elastic recoil & vital capacity.
• Baseline $\text{SpO}_2$ of $93–94\%$ may be normal.
• Hence smaller pneumothoraces may produce earlier decompensation.

Clinical Manifestations of Pneumothorax

• Sudden pleuritic chest pain, unilateral.
• Tachypnea, tachycardia.
• Asymmetric chest expansion – lag on affected side.
• Decreased/Absent tactile fremitus.
• Hyperresonant percussion.
• Decreased or absent breath sounds over collapsed lung.
• In tension: hypotension, tracheal deviation, jugular venous distention (if blood volume adequate).

Diagnostics & Lab Tests

• Chest X-ray (CXR): mainstay for stable pts. Look for visceral pleural line, absence of lung markings, deep sulcus sign supine.
• Ultrasound (POCUS): detects absence of lung sliding and "lung point"; nearly 100% sensitive at bedside.
• CT chest: highest sensitivity; useful for occult pneumothorax or surgical planning, not required for routine dx.
• Arterial Blood Gases (ABGs): essential when clinical deterioration suspected; may show $\uparrow\,\text{A–a gradient},\;\downarrow\,pO_2$.
• Pulmonary Function Tests (PFTs): non-essential acutely; forced maneuvers risk enlarging defect.

Nursing Role in Pneumothorax Care

Environmental / Psychosocial

• Address fear r/t dyspnea & pain; clear communication.
  Preparation & Safety
• Gather chest tube tray, thoracostomy drainage system, sterile water, local anesthetic, dressing materials.
• Ensure high-flow $\text{O}_2$ and resuscitation equipment present.
  Assessment
• Rapid primary survey (Airway, Breathing, Circulation).
• Ongoing VS, lung sounds, chest symmetry, subcutaneous emphysema.
• Recognize small PSPs may self-resolve; tension/large defects demand immediate intervention.

Nursing Process Framework (Slide-Based)

1. Recognize Cues / Assessment – Gather subjective & objective data.
2. Analyze Cues – Identify patterns (e.g., absent breath sounds + hyperresonance → pneumo).
3. Prioritize Hypotheses – Ineffective breathing pattern vs risk for shock.
4. Generate Solutions / Planning – Oxygen therapy, prep for chest tube, analgesia.
5. Take Action / Implementation – Execute plan; assist with needle/ tube insertion.
6. Evaluate Outcomes – Improved breath sounds, symmetric expansion, stable \text{SpO}_2.

Chest Tube & Drainage Systems

Anatomy of a Traditional 3-Chamber System

• Collection Chamber – receives air/ fluid directly from pleural cavity.
• Water-Seal Chamber – one-way valve; oscillations (tidaling) with respiration indicate patency.
• Suction-Control Chamber – uses water column (or dry dial) to apply controlled suction (commonly $\approx -20\,\text{cm H}_2\text{O}$).
• Other features: Air-leak indicator (bubbling scale), safety vent, calibrated columns.

Nurse Responsibilities During Insertion

• Position pt (usually arm raised, HOB $30–60^{\circ}$).
• Maintain sterile field, hand equipment, monitor pt tolerance.
• Premedicate with opioids/ benzodiazepines; administer lidocaine locally.
• Verify placement with immediate post-chest-tube CXR ("STAT PCXR s/p insertion").
• Apply airtight occlusive dressing; label date/time.

Ongoing Management

• Confirm gentle bubbling only in suction chamber; continuous bubbling here is expected with wet suction devices (NOT an air leak).
• Absence of tidaling may indicate lung re-expansion or obstruction.
• Keep system below pt chest level, no dependent loops.
• Never clamp chest tube unless ordered for brief trial before removal or during change of system.

Hemothorax

Pathophysiology

• Accumulation of blood within pleural space, commonly from torn intercostal/ internal mammary vessels or pulmonary/ hilar injury.
• Each hemithorax can hold $\approx 3,000\,\text{mL}$ → massive hemorrhage → hypovolemic & respiratory compromise.

Etiology / Epidemiology

• Blunt chest trauma (MVC without seatbelts, high-speed deceleration).
• Penetrating trauma (stab, gunshot), iatrogenic injury (central lines), malignancy, anticoagulation.

Impact on Older Adult

• Same age-related pulmonary limitations as pneumothorax; additional challenge of reduced physiologic reserve → faster decompensation.

Clinical Manifestations

• Similar to pneumothorax but:
  • Possible dullness to percussion if large blood volume.
  • No Jugular Vein Distention (JVD) despite hypotension – blood loss rather than obstructive shock.
  • Signs of hypovolemia: tachycardia, cold clammy skin, narrow pulse pressure.

Diagnostics

• Upright CXR: fluid level >$200\,\text{mL}$ visible; blunting of costophrenic angle.
• Thoracentesis / Chest Tube: diagnostic & therapeutic—measure initial drainage volume.

Nursing Management of Hemothorax

• Large-bore chest tube (usually $36–40\text{F}$) inserted to drain blood.
• Volume replacement: IV crystalloids, blood products (Type-specific or O-negative).
• Frequent measurement of output; >$1500\,\text{mL}$ immediate or >$200\,\text{mL}\,\text{hr}^{-1}$ x2–4 h suggests surgical (VATS or thoracotomy) intervention.
• Psychosocial: address anxiety, explain procedures; include family in updates.

Comparison – Pneumothorax vs Hemothorax

Complications to Monitor

• Re-expansion pulmonary edema.
• Subcutaneous emphysema.
• Persistent air leak (>$5\text{d}$).
• Empyema / infection.
• Recurrence (PSP recurrence rate $\approx 30\%$ within $6–12\text{mo}$).

Chest Drainage Management – Pearls

• "You suck" = suction chamber; "You blow" = water seal (air exits).
• Maintain prescribed suction level; adjust wall regulator only for wet systems; for dry, set dial on device.
• Continuous bubbling in water-seal chamber = air leak → check connections, dressing, lungs.
• If system breaks, submerge chest tube end in sterile water $\ge 2\text{cm}$ immediately.

Review Question Rationales

1. Paradoxical chest movement after blunt trauma suggests flail chest → impaired ventilation; highest priority over pain, tachycardia, ecchymosis.
2. Continuous bubbling in suction-control chamber is normal for a wet system → continue to monitor.
3. Open chest stab wound: apply vented (three-side) non-porous dressing to prevent conversion to tension pneumothorax.

Ethical, Legal, & Practical Considerations

• Timely recognition & intervention is lifesaving; failure may constitute negligence.
• Informed consent for chest tube when possible; emergency doctrine applies if pt unable.
• Ensure universal precautions; large blood loss = biohazard.
• Advocate for seatbelt use, smoking cessation, altitude precautions for high-risk patients.

Connections to Prior & Real-World Concepts

• Builds upon respiratory physiology (negative pressure ventilation) and shock pathways.
• Relates to trauma nursing, ATLS primary survey, and mechanical ventilation (barotrauma).
• Chest tube care parallels other closed-system drainage management (e.g., Foley, wound VAC) emphasizing gravity, sterility, patency.

Key Formulas & Values

• Pleural pressure: $P<em>{pl} \approx -8\,\text{cm H}</em>2\text{O}$ at end-expiration.
• Rule of thumb for hemothorax operative management:
  \text{Initial drainage} > 1500\,\text{mL} \; \text{OR} \; > 200\,\text{mL}\,\text{hr}^{-1} \times 2\text{–}4\,\text{h} \Rightarrow Thoracotomy}
• Oxygen saturation goal: >94\% unless COPD baseline lower.

High-Yield Takeaways

• Any sudden respiratory distress in trauma or procedure warrants evaluation for pneumothorax/hemothorax.
• Tension physiology = clinical diagnosis → treat before imaging.
• Chest tube function hinges on unobstructed, gravity-dependent drainage and intact water seal.
• Older adults decompensate quickly; normal \text{SpO}_2 may be $93–94\%$ but trending down signals trouble.
• Reassess frequently: lung sounds, vitals, output, device integrity.