Exhaustive Study Guide: Chest Trauma, Pneumothorax, and Pulmonary Embolism

Chest Trauma and Thoracic Injuries

  • Chest trauma encompasses a wide range of traumatic injuries to the thorax that contribute significantly to traumatic morbidity and mortality.
  • Spectrum of Severity: Injuries range from simple rib fractures to severe internal organ disruption and cardiorespiratory arrest.
  • Mechanisms of Injury:
    • Blunt Trauma: Occurs when the chest is struck by an object. Results in shearing and compression injuries of internal thoracic structures. The external appearance of the chest wall may appear minor or unremarkable despite severe underlying internal organ damage.
    • Penetrating Trauma: Occurs when a foreign object impales or passes directly through body tissues, creating an open chest wound.

Emergency Management of Chest Trauma

  • Assessment for Signs of Respiratory Distress:

    • Dyspnea
    • Cough with or without hemoptysis
    • Cyanosis
    • Tracheal deviation
    • Decreased breath sounds over affected areas
    • Decreased oxygen saturation (SpO2\text{SpO}_2
    • Frothy respiratory secretions

  • Assessment for Signs of Cardiovascular Compromise:

    • Rapid, thready pulse
    • Decreased blood pressure (BP\text{BP}) with narrowed pulse pressure and/or asymmetric arm readings
    • Distended neck veins
    • Muffled heart sounds
    • Chest pain
    • Cardiac dysrhythmias

  • Initial Emergency Interventions:

    • Assess Circulation, Airway, and Breathing (CAB\text{CAB}/ABC\text{ABC}).
    • Apply high-flow oxygen (O2\text{O}_2) to maintain SpO2>90%\text{SpO}_2 > 90\%
    • Establish intravenous access using 22 large-bore catheters and initiate fluid resuscitation as appropriate.
    • Remove clothing to complete a full assessment of thoracic injuries.
    • Cover any sucking chest wound with a nonporous, occlusive dressing taped on 33 sides (allows air to escape on expiration while preventing external air entrainment on inspiration).
    • Stabilize impaled objects in place using bulky dressings; do not remove the object.
    • Assess for and manage other significant injuries appropriately.
    • Position patient in semi-Fowler's position or turn onto the injured side (only after ruling out cervical spine injury).
    • Administer analgesia as prescribed.
    • Prepare for emergency needle decompression if tension pneumothorax is suspected.

  • Ongoing Monitoring Requirements:

    • Vital signs
    • Level of consciousness (LOC\text{LOC}
    • Oxygen saturation (SpO2\text{SpO}_2
    • Cardiac rhythm
    • Respiratory status
    • Urinary output
    • Preparation for potential endotracheal intubation

Pathophysiology and Classification of Pneumothorax

  • Pathophysiology:

    • Pneumothorax is caused by air entering the pleural space.
    • Normally, negative pressure exists between the visceral and parietal pleurae. Entry of air converts intrapleural pressure into positive pressure.
    • Positive intrapleural pressure causes the affected lung to partially or completely collapse.
    • As the volume of air in the pleural space increases, available lung volume is correspondingly reduced.

  • Anatomical Classifications:

    • Open Pneumothorax: Air enters the pleural space through an opening in the chest wall (e.g., penetrating chest trauma creating a sucking chest wound).
    • Closed Pneumothorax: No external chest wall wound is present.
    • Clinical Suspicion: Always suspect pneumothorax in any patient presenting with chest wall trauma.

  • General Clinical Manifestations:

    • Small Pneumothorax: Mild tachycardia and mild dyspnea.
    • Large Pneumothorax: Respiratory distress, tachypnea, and absent breath sounds over the affected lung zone.
    • Diagnostic Confirmation: Confirmed via chest X-ray.

Pneumothorax with collapsed lung diagram

Clinical Types of Pneumothorax

  • Spontaneous Pneumothorax:

    • Occurs due to the rupture of small air-filled sacs called blebs located on the visceral pleura.
    • Can occur in previously healthy individuals or in patients with chronic pulmonary conditions (e.g., chronic obstructive pulmonary disease [COPD], asthma, cystic fibrosis, pneumonia).
    • Risk Factors: Tall, thin stature, male gender, family history of spontaneous pneumothorax, or personal history of a prior spontaneous pneumothorax.

  • Iatrogenic Pneumothorax:

    • Occurs as a direct result of medical procedures or interventions.
    • Causes: Transthoracic needle biopsies, subclavian central venous catheter insertion, mechanical ventilation (barotrauma), and esophageal perforation/trauma.

  • Tension Pneumothorax:

    • Pathophysiology: Rapid accumulation of air in the pleural space that cannot escape. Results in progressively increasing intrapleural pressure.
    • Hemodynamic Impact: High pressure pushes the lung and causes a mediastinal shift toward the unaffected side, compressing the heart, superior vena cava, and inferior vena cava. This leads to impaired venous return and a severe reduction in cardiac output.
    • Can occur in both open and closed pneumothorax.
    • Clinical Significance: Medical emergency that can quickly be fatal if intrapleural pressure is not relieved.
    • Manifestations: Severe dyspnea, marked tachycardia, tracheal deviation away from the affected side, decreased or absent breath sounds on the affected side, neck vein distention (JVD), cyanosis, and diaphoresis.

Tension pneumothorax diagram showing mediastinal shift

Interprofessional Care and Emergency Interventions for Pneumothorax

  • Treatment approach depends on severity, underlying cause, and hemodynamic stability of the patient.

  • Emergency Dressing Management:

    • Cover an open chest wound with a sterile nonporous dressing secured on 33 sides.
    • Inspiration Mechanism: Negative suction pulls the dressing flat against the chest wall, preventing ambient air from entering the pleural cavity.
    • Expiration Mechanism: Increased chest pressure pushes the dressing outward, allowing accumulated pleural air to escape.

  • Impaled Objects: If an impaled object remains in the chest wall, stabilize it with a bulky dressing—never extract the object.

  • Summary of Key Interventions by Condition:

    • Tension Pneumothorax: Immediate needle decompression followed by insertion of a chest tube attached to a water-seal drainage system.
    • Standard Traumatic/Spontaneous Pneumothorax: Insertion of chest tubes connected to water-seal drainage.
    • Surgical Treatments: Partial pleurectomy, surgical stapling, or pleurodesis.

Chest Tubes and Pleural Drainage Systems

  • Purpose: Placed in the pleural space to drain accumulated air, fluid, or blood, reestablish negative intrapleural pressure, and facilitate lung re-expansion.

  • Tube Specifications:

    • Standard length: Approximately 20 inches20\,\text{inches}.
    • Sizing ranges from 12∘12^{\circ} to 40∘ F40^{\circ}\text{ F} (12 Fr12\,\text{Fr} to 40 Fr40\,\text{Fr}
    • Small tubes: Used to drain air.
    • Medium tubes: Used to drain thin fluids.
    • Large tubes: Used to drain thick fluid or blood.
    • Pigtail tubes: Small-bore catheters (10∘10^{\circ} to 14∘ F14^{\circ}\text{ F} / 10 Fr10\,\text{Fr} to 14 Fr14\,\text{Fr}

  • Chest Tube Insertion Procedure:

    • Performed in the Emergency Department, Operating Room, or at the patient's bedside.
    • Standard insertion location: Midaxillary line.
    • Patient positioning: Head of bed elevated 3030 to 60 degrees60\,\text{degrees} with the patient's arm raised above their head.
    • Area cleaned with antiseptic, local anesthetic injected.
    • Small incision made over a rib; tube guided into the pleural space.
    • Sutured to the chest wall and sealed with an occlusive dressing.
    • Connected to a closed chest drainage system; position verified via post-procedure chest X-ray.
    • Anatomical placement variation: Second intercostal space (anteriorly) used to remove air; lower intercostal spaces used to drain blood and fluid.

Placement of chest tubes diagram

  • Structure of Pleural Drainage Units (Three Compartments):

    • First Compartment (Collection Chamber): Receives fluid, blood, or drainage from the pleural space. Fluid stays in this chamber while air vents into the second compartment.
    • Second Compartment (Water-Seal Chamber): Contains 2 cm2\,\text{cm} of sterile water. Acts as a one-way valve—air enters from the patient, bubbles through the water, and vents out, but cannot return back into the pleural space.
    • Third Compartment (Suction Control Chamber): Applies regulated negative suction pressure to the pleural space using a column of water or a dry mechanical regulator.

  • Suction Control Types:

    • Wet Suction Systems: The depth of water in the third chamber (typically filled to 20 cm20\,\text{cm}) dictates the suction level applied. Excess wall suction is vented. The usual order is −20 cm H2O-20\,\text{cm H}_2\text{O}. Wall suction source is adjusted until gentle, continuous bubbling occurs in the third chamber.
    • Dry Suction Systems: Uses no water column in the suction chamber (eliminates bubbling noise and evaporation). Negative suction pressure is set using a manual regulator dial (e.g., −20 cm H2O-20\,\text{cm H}_2\text{O}); features a visual indicator/bellows to confirm suction operation.

Water seal chest drain unit diagram

Dry suction chest drain unit diagram

  • Monitoring Chamber Dynamics:
    • Bubbling in Water-Seal Chamber: Brisk upon initial insertion or during air evacuation; gradually ceases as the lung re-expands. Intermittent bubbling is expected during exhalation, coughing, or sneezing.
    • Tidaling in Water-Seal Chamber: Normal fluctuation of water level matching pressure changes during respiration (rises on inspiration, falls on expiration in spontaneously breathing patients). Ceases as the lung fully re-expands. Sudden cessation of tidaling necessitates checking for tube occlusion or kinks.

Nursing Responsibilities for Chest Tubes and Drainage Systems

  • Setup and Insertion:

    • Verify signed consent and ensure the patient is informed about the procedure.
    • Gather and assemble equipment according to provider order.
    • Keep connection tubing loosely coiled on the bed; ensure all connections are tight and securely taped.
    • Monitor system for tidaling, bubbling, air leaks, and fluid levels.

  • Drainage Management and Safety Protocols:

    • Always maintain the drainage unit in an upright position below chest level.
    • Mark fluid levels directly on the collection chamber with time and date at regular intervals.
    • Reporting Parameters: Notify the healthcare provider immediately if drainage exceeds 200 mL/hr200\,\text{mL/hr} within the first hour or remains greater than 100 mL/hr100\,\text{mL/hr} in subsequent hours.
    • Replace the entire unit when the collection chamber is full.
    • Unit Breakage Intervention: If the drainage unit breaks or disconnects, submerge the distal end of the chest tube in 2 cm2\,\text{cm} of sterile water or sterile saline in a clean container to maintain the water seal while a replacement unit is prepared.
    • Stripping/Milking Warning: Do not milk or strip chest tubes due to dangerous high negative pressure spikes created within the pleural space.
    • Clamping Guidelines: Routine clamping during patient transport or disconnection is not recommended due to the risk of inducing a rapid tension pneumothorax. Clamping is permitted only briefly to switch drainage units or check for air leaks.

  • Suction Adjustments:

    • Wet Suction: Frequently check water levels; maintain suction at −20 cm H2O-20\,\text{cm H}_2\text{O} with gentle continuous bubbling.
    • Dry Suction: Set regulator dial to prescribed level. If reducing suction pressure, depress the high-negativity vent valve and confirm proper water level in the water-seal chamber.

  • Dressing Changes and Site Assessment:

    • Change dressings according to institutional policy using sterile, aseptic technique.
    • Apply petroleum gauze (petrolatum gauze) directly around the chest tube site.
    • Inspect the insertion site for signs of infection and palpate for subcutaneous emphysema (crepitus).

Petrolatum gauze packaging

  • Patient Clinical Care:

    • Monitor vital signs, breath sounds, oxygenation, and pain levels.
    • Encourage deep breathing exercises, incentive spirometry, and active range-of-motion (ROM) exercises for the arm on the affected side.
    • Complications to Monitor: Re-expansion pulmonary edema, sudden hypotension, and severe subcutaneous emphysema.

  • Chest Tube Removal Procedure:

    • Performed when lungs are fully re-expanded and fluid drainage is minimal/ceased.
    • Administer prescribed analgesia prior to removal.
    • Instruct the patient to perform the Valsalva maneuver (hold breath and bear down) while the tube is being pulled out to prevent air entry.
    • Immediately seal the site with an occlusive, airtight dressing.
    • Obtain a post-removal chest X-ray and evaluate the patient for any signs of respiratory distress.

Pathophysiology and Etiology of Pulmonary Embolism (PE)

  • Definition: Occlusion of one or more pulmonary arteries by a blood clot (thrombus), fat embolus, air embolus, or tumor tissue.
  • Pathophysiology: A thrombus originates in the venous system, travels through the right side of the heart, enters the pulmonary circulation, lodges in a narrow pulmonary vessel, and obstructs alveolar perfusion.
  • Anatomical Predilection: Most frequently affects the lower lobes of the lungs.
  • Etiology and Thrombus Origin:
    • Most commonly arises from deep vein thrombosis (DVT) in the deep veins of the lower extremities (femoral or iliac veins), pelvic veins, or the right atrium/ventricle (associated with atrial fibrillation).

Diagram of normal vein versus deep vein thrombosis

  • Other Embolus Types: Catheter-related thrombi (central venous catheters or arterial lines), fat emboli (secondary to long bone fractures), air emboli (improper IV line administration), heart valve bacterial vegetations, amniotic fluid emboli, and circulating tumor fragments.
  • Saddle Embolus: A massive thrombus lodged at the main pulmonary artery bifurcation, causing severe hemodynamic compromise.

Risk Factors and Complications of Pulmonary Embolism

  • Risk Factors for PE / VTE:

    • Immobility or prolonged reduced mobility
    • Surgical procedure within the previous 3 months3\,\text{months} (especially pelvic and lower extremity orthopedic surgery)
    • History of prior VTE / DVT
    • Malignancy / Cancer
    • Obesity
    • Oral contraceptive use or hormone therapy
    • Cigarette smoking
    • Prolonged air travel or sitting
    • Heart failure
    • Pregnancy and postpartum state
    • Inherited hypercoagulable / clotting disorders

  • Clinical Manifestations:

    • Severity depends on embolus size, location, and degree of vessel obstruction.
    • Dyspnea: Most common symptom (occurs in 85%85\%
    • Mild to moderate hypoxemia
    • Tachypnea, cough, pleuritic chest pain, hemoptysis, lung crackles, wheezing, fever, tachycardia, syncope, accentuation of the pulmonic heart sound (S2\text{S}_2
    • Massive PE: Sudden change in mental status, acute hypotension, severe feeling of impending doom, cardiorespiratory collapse, and rapid death.

  • Complications:

    • Pulmonary Infarction: Occlusion of medium or large pulmonary vessels combined with inadequate collateral bronchial circulation and pre-existing lung disease leads to tissue necrosis and alveolar hemorrhage. May result in lung abscess formation and secondary pleural effusion.
    • Pulmonary Hypertension: Results from hypoxemia combined with blockage of greater than 50%50\%

Diagnostic Evaluation of Pulmonary Embolism

  • Primary Diagnostic Tests:
    • D-Dimer: Measures cross-linked fibrin degradation fragments. Elevated with any clot breakdown. High sensitivity, but non-specific; false negatives can occur with small PEs.
    • Spiral (Helical) CT Scan / CT Angiography (CTA): Most commonly utilized diagnostic tool. Requires intravenous iodinated contrast media. Generates 3D images of the pulmonary arterial bed.
    • Ventilation-Perfusion (V/Q) Scan: Utilized if a patient cannot receive IV contrast (e.g., renal failure, severe contrast allergy).
    • Perfusion Scan Component: Intravenous injection of a radioisotope to image pulmonary blood flow.
    • Ventilation Scan Component: Inhalation of a radioactive gas to assess gas distribution throughout the lungs.

Ventilation-perfusion SPECT scan

  • Secondary Adjunctive Diagnostics (Non-Diagnostic Alone):
    • Arterial Blood Gases (ABGs)
    • Chest X-ray
    • Electrocardiogram (ECG / EKG)
    • Serum Troponin levels (elevated with right ventricular strain)
    • b-type natriuretic peptide (BNP) levels (elevated with right ventricular strain)

Interprofessional Management and Nursing Care for Pulmonary Embolism

  • Pillars of Interprofessional Care:

    1. Support Cardiopulmonary Status.
    2. Drug Therapy (Anticoagulation, Thrombolytic therapy).
    3. Surgical / Interventional Management (Pulmonary embolectomy, Inferior Vena Cava [IVC] filter insertion).

  • Preventive Nursing Care:

    • Apply intermittent pneumatic compression (IPC) devices / sequential compression devices.
    • Early and frequent post-operative ambulation.
    • Administer prophylactic anticoagulation therapy.

  • Immediate Acute Management:

    • Place patient on bed rest in semi-Fowler's position.
    • Continuously assess cardiopulmonary status.
    • Administer supplemental oxygen, IV fluids, and prescribed medications.
    • Monitor coagulation studies (aPTT, PT/INR) and watch closely for bleeding complications.

  • Patient Support:

    • Reassure patient and manage severe anxiety, chest pain, dyspnea, and fear of death.

  • Patient Education Requirements:

    • Provide thorough instruction regarding long-term oral anticoagulant therapy.
    • Teach lifestyle and mobility measures to prevent recurrent VTE.
    • Emphasize the critical importance of scheduled follow-up medical examinations and monitoring.