Tension Pneumothorax

Tension Pneumothorax Overview

  • Definition: Tension pneumothorax is a life-threatening condition where air becomes trapped in the pleural space, collapsing the lung on the affected side.

  • Example Scenario: In the event of a gunshot wound to the chest (e.g., right side), the bullet enters, causing the lung to leak air and collapse.

Pathophysiology

  • Initial Collapse: The lung begins to collapse due to air escaping into the pleural space.

  • Pressure Build-Up: Over time, the accumulated air in the pleural cavity creates increasing pressure against the lungs and thorax, leading to:

    • Complete collapse of the affected lung.

    • Potential displacement of mediastinal structures, including the heart and major blood vessels.

    • Increased intrathoracic pressure causing hypotension as the heart struggles to pump effectively due to external pressure.

Risk Factors

  • Trauma: Any traumatic injury, such as gunshots or stabbings, can lead to pneumothorax.

  • Demographics: Young, tall, thin men, particularly those who are underweight, are at greater risk for spontaneous pneumothorax.

Distinction from Simple Pneumothorax

  • Simple Pneumothorax: No significant pressure on the heart and no hypotension.

  • Tension Pneumothorax: There is increased intrathoracic pressure leading to:

    • Hypotension.

    • Compromised heart function.

Signs and Symptoms

  • Physical Observation:

    • Absent or diminished lung sounds on the affected side.

    • Asymmetrical chest rise and fall due to one lung not inflating properly.

  • Symptoms:

    • Difficulty breathing (dyspnea).

    • Sharp chest pain at the site of injury.

    • Jugular Venous Distension (JVD) due to pressure on the heart.

  • Type of Shock: Considered as obstructive shock since the air pressure prevents effective heart pumping.

Management and Treatment

  • Basic Life Support (BLS):

    • Oxygen Administration: Aim for SpO2 levels above 94% using oxygen therapy.

    • Three-Sided Dressing:

      • Apply a dressing to the wound with three sides taped down to allow air to escape the pleural cavity while preventing additional air entry.

      • This can be achieved using improvised materials (e.g., plastic) if necessary.

    • Bag-Valve-Mask (BVM) Ventilation:

      • Initiate positive pressure ventilation if the patient cannot control his/her airway.

      • Avoid in cases where the patient can still speak in full sentences, indicating they are maintaining their own airway.

Critical Points

  • Consequences of Inaction: If left untreated, a tension pneumothorax will lead to obstructive shock and can be fatal.

  • Recognition and Decisive Action: Prompt identification and intervention are key to prevent deterioration of the patient's condition.