TNCC Thoracic Trauma — Questions and Answers
Question 1: What is the most common cause of thoracic trauma in adults in the United States?
- Penetrating stab wounds
- Motor vehicle collisions (Correct answer)
- Falls from height
- Blast injuries
Correct answer: Motor vehicle collisions
Motor vehicle collisions are the leading cause of blunt thoracic trauma in the US, accounting for the majority of chest injuries seen in trauma centers.
Question 2: A patient presents with tracheal deviation away from the affected side, absent breath sounds, hypotension, and jugular venous distension. Which condition does this describe?
- Massive hemothorax
- Cardiac tamponade
- Tension pneumothorax (Correct answer)
- Flail chest
Correct answer: Tension pneumothorax
Tension pneumothorax causes air to accumulate under pressure, shifting the mediastinum and trachea away from the affected side while producing obstructive shock.
Question 3: What is the immediate intervention for suspected tension pneumothorax in a rapidly deteriorating patient?
- Chest X-ray confirmation followed by chest tube insertion
- Needle decompression at the second intercostal space, midclavicular line (Correct answer)
- Endotracheal intubation and positive pressure ventilation
- Emergency pericardiocentesis
Correct answer: Needle decompression at the second intercostal space, midclavicular line
Needle decompression is the immediate life-saving intervention for tension pneumothorax; imaging should never delay treatment in a deteriorating patient.
Question 4: Which injury is characterized by paradoxical chest wall movement during respiration?
- Open pneumothorax
- Tension pneumothorax
- Flail chest (Correct answer)
- Pulmonary contusion
Correct answer: Flail chest
Flail chest occurs when three or more consecutive ribs are fractured in two or more places, creating a free-floating segment that moves opposite to the rest of the chest wall.
Question 5: Beck's triad of hypotension, muffled heart sounds, and distended neck veins is the classic presentation of which condition?
- Tension pneumothorax
- Massive hemothorax
- Cardiac tamponade (Correct answer)
- Traumatic aortic injury
Correct answer: Cardiac tamponade
Beck's triad describes cardiac tamponade, in which fluid accumulation in the pericardial sac restricts cardiac filling and reduces cardiac output.
Question 6: What is the correct initial management for an open pneumothorax (sucking chest wound)?
- Immediate chest tube insertion directly at the wound site
- Application of an occlusive dressing sealed on three sides (Correct answer)
- Complete occlusion of the wound with an airtight dressing
- Endotracheal intubation as the only intervention
Correct answer: Application of an occlusive dressing sealed on three sides
A three-sided occlusive dressing allows air to escape on exhalation while preventing entrainment on inhalation, avoiding conversion to a tension pneumothorax.
Question 7: Massive hemothorax is defined as blood accumulation in the pleural space of at least how much?
- 500 mL
- 750 mL
- 1,000 mL
- 1,500 mL (Correct answer)
Correct answer: 1,500 mL
Massive hemothorax is defined as 1,500 mL or more of blood in the pleural space, which causes significant hemodynamic compromise and requires immediate intervention.
Question 8: What is the primary respiratory intervention for a patient with flail chest causing significant respiratory distress?
- Needle decompression of the affected side
- Positive pressure ventilation with supplemental oxygen (Correct answer)
- Immediate surgical fixation of all fractured ribs
- Application of a sandbag to stabilize the flail segment
Correct answer: Positive pressure ventilation with supplemental oxygen
Positive pressure ventilation provides internal pneumatic stabilization of the flail segment while supporting oxygenation and ventilation in the distressed patient.
Question 9: Which chest X-ray finding is most suggestive of traumatic aortic injury?
- Left-sided pneumothorax
- Widened mediastinum greater than 8 cm (Correct answer)
- Multiple bilateral rib fractures
- Tracheal deviation to the right
Correct answer: Widened mediastinum greater than 8 cm
A widened mediastinum (>8 cm on an AP chest radiograph) is the classic sign of traumatic aortic injury caused by mediastinal hematoma formation from aortic disruption.
Question 10: Which temporary intervention is performed for hemodynamically unstable cardiac tamponade when immediate surgery is unavailable?
- Chest tube insertion at the fourth intercostal space
- Needle decompression at the midclavicular line
- Pericardiocentesis to aspirate pericardial blood (Correct answer)
- Emergent external cardiac pacing
Correct answer: Pericardiocentesis to aspirate pericardial blood
Pericardiocentesis removes blood from the pericardial sac to relieve tamponade physiology and provides temporary hemodynamic improvement until definitive surgical repair.
Question 11: What pathophysiology underlies the obstructive shock of tension pneumothorax?
- Loss of circulating volume from intrathoracic hemorrhage
- Increased intrathoracic pressure compressing the heart and great veins, impairing venous return (Correct answer)
- Peripheral vasodilation from neurogenic mechanisms
- Myocardial depression from direct cardiac contusion
Correct answer: Increased intrathoracic pressure compressing the heart and great veins, impairing venous return
Tension pneumothorax elevates intrathoracic pressure, compressing the vena cava and right ventricle, which severely reduces venous return and cardiac output, producing obstructive shock.
Question 12: Which physical exam finding is expected in a patient with a large hemothorax?
- High-pitched wheezing on the affected side
- Hyperresonance to percussion on the affected side
- Dullness to percussion and absent breath sounds on the affected side (Correct answer)
- Crepitus and inspiratory stridor
Correct answer: Dullness to percussion and absent breath sounds on the affected side
Blood in the pleural space produces dullness to percussion and displaces air from the lung, eliminating breath sounds on the affected side.
Question 13: Which mechanism most commonly converts a simple pneumothorax to a tension pneumothorax during positive pressure ventilation?
- Massive hemothorax increasing intrathoracic pressure
- A one-way valve mechanism from a lung laceration or chest wound (Correct answer)
- Pulmonary contusion worsening over time
- Isolated rib fractures causing pleural irritation
Correct answer: A one-way valve mechanism from a lung laceration or chest wound
A one-way valve from a lung laceration allows air to enter the pleural space with each positive pressure breath without a means of escape, rapidly building tension.
Question 14: A trauma patient presents with facial cyanosis, petechiae of the upper body, and bilateral subconjunctival hemorrhages after being pinned under a heavy object. What injury should be suspected?
- Traumatic aortic transection from rapid deceleration
- Traumatic asphyxia from prolonged thoracic compression causing retrograde venous hypertension (Correct answer)
- Penetrating injury to the superior vena cava
- Blast lung from primary overpressure wave
Correct answer: Traumatic asphyxia from prolonged thoracic compression causing retrograde venous hypertension
Traumatic asphyxia results from sustained compressive force on the thorax suddenly raising intrathoracic pressure and forcing blood retrograde into the head and neck venous system.
