PHTLS - Prehospital Trauma Life Support Thoracic Trauma 2 — Questions and Answers
Question 1: What is the hallmark physical finding of a tension pneumothorax?
- Bilateral wheezing
- Unilateral absent breath sounds with hypotension and jugular venous distention (Correct answer)
- Bilateral crackles with productive cough
- Normal breath sounds with mild chest pain
Correct answer: Unilateral absent breath sounds with hypotension and jugular venous distention
Tension pneumothorax classically presents with absent breath sounds on the affected side, hypotension from impaired venous return, and JVD from increased intrathoracic pressure.
This is a CLINICAL diagnosis; do not delay treatment waiting for imaging. Needle decompression of the affected side is the immediate life-saving intervention, followed by chest tube placement at the hospital.
Question 2: How does PHTLS recommend performing needle decompression for tension pneumothorax?
- Insert a 14-gauge needle in the 2nd intercostal space, midclavicular line or 5th intercostal space, anterior axillary line on the affected side (Correct answer)
- Insert a needle in the 4th intercostal space on both sides
- Use a small-gauge butterfly needle in the supraclavicular area
- Only perform with ultrasound guidance
Correct answer: Insert a 14-gauge needle in the 2nd intercostal space, midclavicular line or 5th intercostal space, anterior axillary line on the affected side
PHTLS teaches needle decompression at two acceptable sites: 2nd intercostal space midclavicular line or 5th intercostal space anterior axillary line.
The lateral approach has gained favor because the chest wall is thinner at this location. Technique: use a 14-gauge, 3.25-inch or longer angiocatheter; insert perpendicular to the chest wall just ABOVE the rib to avoid the intercostal neurovascular bundle.
Question 3: What is a flail chest and why is it clinically significant?
- A single rib fracture with minimal displacement
- Two or more ribs fractured in two or more places creating a free-floating segment that impairs ventilation (Correct answer)
- A sternal fracture without rib involvement
- Costochondral separation without respiratory compromise
Correct answer: Two or more ribs fractured in two or more places creating a free-floating segment that impairs ventilation
A flail segment is created when multiple adjacent ribs are fractured at two points, producing a free-floating section that moves paradoxically during breathing.
The paradoxical motion itself is NOT the primary cause of respiratory compromise; the underlying pulmonary contusion is. Management includes high-flow oxygen, positive pressure ventilation if needed, and careful fluid management.
Question 4: What is the appropriate prehospital management of a massive hemothorax?
- Needle decompression of the affected side
- Aggressive fluid resuscitation, high-flow oxygen, and rapid transport to a facility capable of emergency thoracotomy (Correct answer)
- Chest compressions to redistribute the blood
- Elevation of the affected side
Correct answer: Aggressive fluid resuscitation, high-flow oxygen, and rapid transport to a facility capable of emergency thoracotomy
Massive hemothorax requires rapid volume replacement, oxygenation support, and urgent surgical intervention; needle decompression does not address blood accumulation.
Massive hemothorax is defined as >1,500 mL of blood in the pleural space. Clinical findings include absent breath sounds, hypotension, flat neck veins (distinguishes from tension pneumothorax which has JVD), and dullness to percussion.
Question 5: How does PHTLS differentiate between tension pneumothorax and massive hemothorax on physical exam?
- They present identically in all cases
- Tension pneumothorax shows JVD and hyperresonance; massive hemothorax shows flat neck veins and dullness to percussion (Correct answer)
- Only chest X-ray can differentiate them
- Massive hemothorax always has bilateral findings
Correct answer: Tension pneumothorax shows JVD and hyperresonance; massive hemothorax shows flat neck veins and dullness to percussion
Key differentiating features are neck vein status and percussion findings: air causes hyperresonance and JVD while blood causes dullness and flat veins.
Both conditions cause absent breath sounds and hypotension but through different mechanisms. If in doubt about whether to decompress, the risk of untreated tension pneumothorax (death) outweighs the risk of unnecessary needle decompression.
Question 6: What is cardiac tamponade and how is it recognized in the prehospital setting?
- Fluid around the lungs causing breathing difficulty
- Blood accumulation in the pericardial sac compressing the heart, recognized by Beck's triad: JVD, muffled heart sounds, and hypotension (Correct answer)
- Air in the pericardial space from a pneumothorax
- Bruising over the sternum without hemodynamic effects
Correct answer: Blood accumulation in the pericardial sac compressing the heart, recognized by Beck's triad: JVD, muffled heart sounds, and hypotension
Cardiac tamponade occurs when blood fills the pericardial sac, compressing the heart chambers and reducing cardiac output.
Beck's triad is present in only about one-third of cases. Penetrating trauma to the cardiac box with JVD and hypotension should raise high suspicion. Treatment is pericardiocentesis or emergency thoracotomy, which are hospital procedures.
PHTLS - Prehospital Trauma Life Support Thoracic Trauma 2
What is the hallmark physical finding of a tension pneumothorax?