Trauma and Burns Practice Questions — USMLE Step 2 CK

Question 1Question →

A 32-year-old female, gravida 1, para 0, at 35 weeks gestation, is brought to the trauma center following a high-speed motor vehicle collision. She was a restrained passenger. On arrival, she is lethargic, confused, and oriented only to her name. Her husband, who was driving and sustained minor injuries, is present in the trauma bay and demands that the medical team focus exclusively on saving the fetus. A card discovered in the patient's wallet legally designates her sister as her healthcare proxy.

Evaluation reveals a patent airway and symmetric vesicular breath sounds bilaterally. Vital signs include a heart rate of 142/min, respiratory rate of 26/min, and blood pressure of 76/40 mm Hg. Pulse oximetry is 98% on room air. The patient is placed on a backboard with manual left uterine displacement. An initial fluid bolus is administered with minimal hemodynamic improvement.

Arterial blood gas analysis on room air reveals:

Parameter	Value
pH	7.46
PaO2	98 mm Hg
PaCO2	28 mm Hg

Extended focused assessment with sonography for trauma (E-FAST) demonstrates a large anechoic collection in the splenorenal recess. There is no evidence of pneumothorax. Fetal heart rate monitoring demonstrates a baseline of 105/min with minimal variability and recurrent late decelerations.

Which of the following is the most appropriate next step in the management of this patient?

Immediate exploratory laparotomy

Computed tomography angiography of the abdomen and pelvis

Emergency cesarean delivery

Initiate targeted medical therapy to correct the respiratory alkalosis

Request informed consent for surgery from the patient's husband

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

The most appropriate next step is an immediate exploratory laparotomy to control the intra-abdominal hemorrhage.

In the setting of acute trauma, a hemodynamically unstable patient with a positive FAST exam requires immediate operative intervention. For this pregnant patient, the free fluid in the splenorenal recess confirms intra-abdominal hemorrhage. The fundamental principle of trauma management in pregnancy is that optimal fetal resuscitation is achieved through aggressive maternal resuscitation. Therefore, the immediate priority is an exploratory laparotomy to stop the bleeding. The fetal distress (late decelerations and baseline bradycardia) is a direct consequence of maternal hypovolemia and uteroplacental hypoperfusion; resolving the maternal shock is the most effective treatment for the fetus.

Step-by-Step Solution

1

Assess the patient's hemodynamic status and trauma primary survey.

The patient is in Class III/IV hemorrhagic shock (HR 142/min, BP 76/40 mm Hg) with altered mental status.

Establishing hemodynamic stability dictates whether the patient can safely undergo imaging (CT) or requires emergent surgical intervention.

2

Evaluate the E-FAST and fetal monitoring results.

E-FAST shows intra-abdominal bleeding (splenorenal fluid). Fetal monitoring shows distress secondary to maternal hypoperfusion.

Identifying the source of bleeding in an unstable patient determines the surgical target (e.g., laparotomy for abdominal fluid).

3

Determine the optimal intervention factoring in pregnancy and ethical constraints.

Maternal stabilization takes absolute precedence. Implied consent applies for emergent life-saving surgery.

Treating the mother's hemorrhage is the only way to restore uteroplacental perfusion. Delaying for consent or fetal delivery increases mortality for both.

Key Concept

In pregnant trauma patients who are hemodynamically unstable with a positive FAST exam, immediate exploratory laparotomy is the indicated next step; maternal resuscitation always takes precedence over fetal intervention.

Question 2Question →

A 45-year-old female weighing 70 kg is brought to the emergency department after being rescued from a house fire. She sustained deep partial-thickness and full-thickness thermal burns over 40% of her total body surface area (TBSA). The injury occurred approximately 1 hour prior to arrival. Upon initial evaluation, her blood pressure is 110/70 mm Hg, heart rate is 115/min, and oxygen saturation is 96% on room air. She is speaking in a hoarse voice, has singed nasal hair, and carbonaceous sputum is noted. Arrange the following management steps in the correct chronological sequence for this patient's acute and subacute burn care.

Drag items to arrange them in the correct order

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Answer

The correct sequence begins with securing the airway via endotracheal intubation, followed by calculating the 24-hour fluid requirement, administering the first half of the fluids over the remaining 7 hours of the first 8-hour post-injury window, titrating ongoing fluids to urine output, and finally initiating colloids after 24 hours.

Acute burn management strictly follows the ATLS ABCs. Airway protection (intubation) is always the first priority when inhalation injury is suspected. Once the airway is secure, circulation is addressed by calculating fluid needs. Crucially, the initial 8-hour resuscitation window begins at the time of injury, requiring the first half of fluids to be given over the remaining 7 hours in this scenario. Subsequent titration is based on urine output. Finally, colloids are withheld until capillary leak resolves at 24 hours.

Step-by-Step Solution

1

Assess and secure the airway.

Endotracheal intubation is performed.

The patient exhibits classic hard signs of inhalation injury (hoarseness, singed hair, carbonaceous sputum), which carries a high risk of imminent airway loss due to rapidly progressive edema.

2

Plan fluid resuscitation for burn shock.

The total 24-hour crystalloid volume is calculated using weight and %TBSA.

Major burns (>20% TBSA) cause massive fluid shifts and third-spacing. Volume requirements must be accurately established to prevent hypovolemic shock.

3

Initiate front-loaded fluid administration.

One-half of the calculated volume is administered over 7 hours.

Capillary permeability peaks immediately after the burn. The first half of the fluid must be given within 8 hours of the time of injury, accounting for transport time.

4

Monitor end-organ perfusion.

Fluid rates are titrated to maintain a urine output of 0.5 mL/kg/hr.

Formulas only provide estimates. Real-time physiological response, specifically urine output, dictates whether the fluid rate needs to be increased or decreased.

5

Transition to subacute fluid management.

Colloid infusions are introduced after 24 hours.

Capillary integrity typically normalizes around 24 hours post-injury, allowing intravascular colloids to effectively increase oncotic pressure without leaking into tissues.

Key Concept

The ATLS sequence for severe thermal burns emphasizes immediate airway protection for inhalation injury, followed by exact, time-dependent fluid resuscitation (calculating from the time of injury, not arrival), and strict avoidance of early colloids.

Question 3Question →

Following an assault, a 29-year-old woman is evaluated in the emergency department for a deep stab wound to the right side of her neck. On arrival, she is confused and diaphoretic. Her blood pressure is 80/40 mmHg and her pulse is 130/min. Physical examination reveals an actively expanding, pulsatile hematoma in the right anterior cervical triangle. There is a continuous stream of bright red blood oozing through the applied pressure dressing. The patient's airway remains patent and breath sounds are bilateral. Which of the following is the most appropriate next step in management?

Immediate surgical exploration of the neck

Computed tomography angiography of the cervical vessels

Duplex ultrasonography of the carotid arteries

Local wound exploration in the emergency department

Observation with serial hematocrit measurements

Show answer & explanation

Answer: Immediate surgical exploration of the neck

Answer

The correct answer is immediate surgical exploration of the neck.

The correct action is immediate surgical exploration of the neck. This patient has sustained penetrating neck trauma and is in hemorrhagic shock. Furthermore, she exhibits classic 'hard signs' of severe vascular injury: an actively expanding, pulsatile hematoma and continuous brisk bleeding. In the context of penetrating trauma, the presence of hemodynamic instability or any hard signs of aerodigestive or vascular injury serves as an absolute, immediate indication for operative exploration and hemorrhage control.

Step-by-Step Solution

1

Assess the patient's hemodynamic status and presenting vital signs.

The patient is in hemorrhagic shock, evidenced by hypotension (80/40 mmHg), tachycardia (130/min), and altered mental status (confusion, diaphoresis).

Determining hemodynamic stability dictates whether the patient can undergo diagnostic imaging or must proceed directly to the operating room.

2

Evaluate the neck wound for 'hard signs' of vascular or aerodigestive tract injury.

The patient has an expanding, pulsatile hematoma and active, continuous bleeding that is refractory to local pressure.

Hard signs of injury in penetrating neck trauma are absolute indications for surgical intervention.

3

Select the most appropriate next step based on the clinical findings.

Immediate surgical exploration of the neck is required.

Hemodynamically unstable patients with penetrating trauma and hard signs of vascular injury must bypass all imaging and undergo emergent operative exploration.

Key Concept

Patients with penetrating neck trauma who exhibit hemodynamic instability or 'hard signs' of vascular injury (such as an expanding/pulsatile hematoma, active severe bleeding, thrill/bruit, or absent pulse) require immediate surgical exploration.

Question 4Question →

A 28-year-old woman is brought to the emergency department after falling from a fourth-story balcony. She was intubated at the scene due to a depressed level of consciousness. Upon arrival, her temperature is 36.1°C (97.0°F), blood pressure is 72/40 mm Hg, and pulse is 138/min. Physical examination reveals a 7-mm, nonreactive right pupil and a 3-mm, briskly reactive left pupil. The trachea is midline, and breath sounds are present and equal bilaterally. The pelvis is stable to anteroposterior and lateral compression. The left thigh is visibly swollen and deformed. Focused assessment with sonography for trauma (FAST) demonstrates an anechoic stripe in the hepatorenal recess. A peripheral intravenous line is established, and 1 L of warmed lactated Ringer solution is rapidly infused; her blood pressure remains 70/40 mm Hg. Which of the following is the most appropriate next step in the management of this patient?

Transport to the radiology department for unenhanced cranial imaging

Intravenous administration of a hyperosmolar agent and transport for neuroimaging

Transport to the radiology department for contrast-enhanced torso imaging

Urgent transfer to the operating suite for abdominal exploration

Performance of a diagnostic peritoneal lavage

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Answer: Urgent transfer to the operating suite for abdominal exploration

Answer

Urgent transfer to the operating suite for abdominal exploration

This patient has sustained polytrauma resulting in severe hemorrhagic shock and a traumatic brain injury. The presence of a fixed and dilated pupil in the setting of a depressed Glasgow Coma Scale score strongly suggests an expanding intracranial hematoma causing uncal herniation. However, the patient is also in profound shock that is unresponsive to initial fluid resuscitation, and the FAST examination is positive for intra-abdominal fluid (blood). According to ATLS protocols, management of the airway and breathing is followed immediately by management of circulation (hemorrhage control). The patient will die of exsanguination before any neurologic injury can be addressed if the intra-abdominal bleeding is not stopped. Therefore, the absolute most appropriate next step is urgent transfer to the operating room for an exploratory laparotomy. Once hemorrhage is controlled and hemodynamics are stabilized, the patient can safely be transported for cranial imaging.

Step-by-Step Solution

1

Assess the patient's hemodynamic status.

The patient is in class IV hemorrhagic shock, evidenced by a blood pressure of 72/40 mm Hg and a heart rate of 138/min, which is unresponsive to an initial fluid bolus.

Hemodynamic stability dictates the entire diagnostic and therapeutic algorithm in blunt trauma.

2

Identify the primary source of life-threatening hemorrhage.

The FAST exam reveals free fluid in the hepatorenal recess (Morison's pouch), indicating massive intra-abdominal hemorrhage.

Localizing the bleeding site determines which surgical team and intervention are required immediately.

3

Prioritize interventions based on Advanced Trauma Life Support (ATLS) principles.

Although the patient has signs of uncal herniation (blown right pupil) indicating a severe traumatic brain injury (TBI), Circulation (C) takes precedence over Disability (D). She must undergo abdominal exploration first.

A patient cannot survive a neurosurgical intervention or a trip to the CT scanner without adequate circulating blood volume. Hemorrhage control is the absolute highest priority.

Key Concept

In blunt trauma, hemodynamically unstable patients with a positive FAST exam require immediate exploratory laparotomy, even in the presence of severe traumatic brain injury.

Estimated Time:1m 30s

Question 5Question →

A 22-year-old male is brought to the emergency department via ambulance after being kicked directly in the abdomen by a horse. On arrival, he is groggy but follows simple commands. His temperature is 36.5°C (97.7°F), blood pressure is 78/40 mm Hg, and pulse is 132/min. Oxygen saturation is 99% on room air. Large-bore intravenous access is established, and 1 liter of crystalloid fluid is rapidly administered. Following the fluid bolus, his blood pressure remains low at 82/45 mm Hg. Physical examination reveals a large contusion over the epigastrium. The abdomen is markedly distended with diffuse rebound tenderness and involuntary guarding. A focused assessment with sonography for trauma (FAST) exam demonstrates a large amount of free fluid in the hepatorenal recess and the splenorenal recess. Which of the following is the most appropriate next step in management?

Computed tomography (CT) of the abdomen and pelvis with intravenous contrast

Admission to the intensive care unit for serial abdominal examinations

Pelvic and abdominal angiography with planned arterial embolization

Immediate exploratory laparotomy

Diagnostic peritoneal lavage (DPL)

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy is the correct next step for this hemodynamically unstable trauma patient with a positive FAST exam.

The correct answer is immediate exploratory laparotomy. This patient has sustained high-energy blunt abdominal trauma and presents in hemorrhagic shock (hypotension, tachycardia) that is unresponsive to an initial fluid bolus. The positive FAST exam confirms the presence of significant intraperitoneal fluid, which must be presumed to be blood in this clinical context. According to standard trauma protocols, any patient who is hemodynamically unstable following blunt abdominal trauma and has a positive FAST exam must be taken directly to the operating room. An emergent laparotomy is necessary to identify and surgically control the source of the life-threatening bleeding.

Step-by-Step Solution

1

Assess the patient's hemodynamic status following initial interventions.

The patient remains hypotensive (82/45 mm Hg) and tachycardic despite receiving a 1-liter crystalloid fluid bolus, indicating ongoing hemorrhagic shock.

Hemodynamic stability is the primary decision point in the Advanced Trauma Life Support (ATLS) algorithm for abdominal trauma.

2

Evaluate the mechanism of injury and physical examination findings.

The patient sustained blunt abdominal trauma (horse kick) and exhibits signs of acute peritonitis (distension, rebound tenderness, guarding).

Physical signs of peritonitis strongly suggest visceral injury and intraperitoneal bleeding.

3

Interpret the results of the primary imaging modality.

The FAST exam is positive for free fluid in multiple dependent recesses of the abdomen.

In the context of trauma and shock, free intraperitoneal fluid is assumed to be blood.

4

Determine the definitive management plan based on the combination of shock and a positive FAST.

The patient must be transported immediately to the operating room.

Surgical exploration is required to locate and arrest the life-threatening intra-abdominal hemorrhage.

Key Concept

Management of Hemodynamically Unstable Blunt Abdominal Trauma

Question 6Question →

For each of the following acute trauma scenarios, identify the most appropriate and definitive initial management step based on Advanced Trauma Life Support (ATLS) principles.

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Answer

The correct pairings rely on identifying hemodynamic instability and hard signs of injury. The unstable patient with a positive FAST requires urgent surgical abdominal exploration. The stable patient with abdominal pain requires CT imaging of the abdomen and pelvis. The patient with an expanding neck hematoma requires transfer to the operating room for surgical neck exploration. The patient with a tension pneumothorax requires emergent insertion of a large-bore chest drain.

Each trauma presentation dictates a specific management pathway heavily influenced by the patient's hemodynamic stability and precise primary survey findings. Recognizing hard signs of injury prevents fatal delays in treatment.

Step-by-Step Solution

1

Evaluate the hemodynamic status of each patient.

Three patients are unstable or borderline unstable, while one is hemodynamically stable.

Hemodynamic stability is the primary branch point dictating whether a trauma patient proceeds to immediate life-saving intervention or can safely undergo further diagnostic imaging.

2

Analyze specific primary survey and physical examination findings.

Identified perisplenic fluid in the unstable ATV rider, an enlarging pulsatile mass in the neck stab victim, and the classic triad of tension pneumothorax in the chest trauma victim.

Certain clinical presentations (e.g., hard signs of vascular injury, tension pneumothorax) demand immediate surgical or procedural intervention.

3

Match findings to standard ATLS management algorithms.

Paired the blunt abdominal trauma/positive FAST with abdominal exploration; the stable blunt trauma with CT imaging; the penetrating neck trauma with hard signs to neck exploration; and the tension pneumothorax to chest drainage.

Adherence to standardized trauma protocols minimizes delays in definitive care and reduces preventable mortality.

Key Concept

Triage and definitive management of acute trauma based on hemodynamic stability and primary survey findings.

Question 7Question →

A 42-year-old male is brought to the emergency department after falling 20 feet from a roof. He is groaning and does not open his eyes or follow commands. Blood is visible in his oropharynx, and he has gurgling respirations. His respiratory rate is 28/min. Breath sounds are absent on the right side, and his trachea is deviated to the left. His blood pressure is 80/40 mm Hg, and his heart rate is 135/min. Arrange the following management steps in the correct chronological order according to Advanced Trauma Life Support primary survey priorities.

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Answer

The correct sequence is: Endotracheal intubation, followed by right-sided thoracostomy, then establishment of intravenous access and transfusion, then neurologic assessment, and finally complete exposure and warming.

The Advanced Trauma Life Support primary survey follows a strict sequence to address the most immediate life-threatening conditions first: Airway, Breathing, Circulation, Disability, and Exposure. The patient's unsecured airway is the most critical immediate threat, followed by the tension pneumothorax, and then the hemorrhagic shock.

Step-by-Step Solution

1

Analyze the clinical presentation to determine the need for a standardized trauma evaluation.

The patient has sustained high-energy blunt trauma and presents with multiple life-threatening injuries.

High-impact trauma requires strict adherence to the standardized primary survey protocol to prevent rapid deterioration and missed injuries.

2

Identify the first intervention required based on the primary survey protocol.

The first step is securing the airway via endotracheal intubation.

Airway compromise (evidenced by gurgling and a comatose state) will cause death more rapidly than any other injury and must be managed first.

3

Identify the second intervention required for breathing and ventilation.

The next step is decompression of the right hemithorax via thoracostomy.

Once the airway is secured, the tension pneumothorax (evidenced by absent breath sounds and tracheal deviation) must be treated to restore ventilation and venous return.

4

Identify the third intervention required for circulation and hemorrhage control.

The subsequent step is obtaining intravenous access and initiating transfusion.

After restoring oxygenation and ventilation, hemorrhagic shock (evidenced by hypotension and tachycardia) must be treated with immediate volume replacement.

5

Determine the final steps of the primary survey.

The final steps are assessing neurologic disability and completely exposing the patient.

A formal neurologic assessment and complete physical exposure to check for hidden injuries conclude the immediate life-saving survey.

Key Concept

Advanced Trauma Life Support Primary Survey Sequence

Question 8Question →

Match each clinical presentation of a trauma patient to the most appropriate next step in management or diagnostic imaging.

Click a left item, then click its matching right item

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Answer

1 matches with Immediate exploratory laparotomy; 2 matches with CT scan; 3 matches with Pelvic angiography; 4 matches with Diagnostic laparoscopy; 5 matches with Retrograde cystography.

The correct pairings follow Advanced Trauma Life Support (ATLS) algorithms. Hemodynamic instability with intraperitoneal fluid necessitates exploratory laparotomy. Stable blunt trauma patients require CT imaging. Retroperitoneal pelvic bleeding is managed angiographically. Occult diaphragmatic injuries require laparoscopy, and gross hematuria with a pelvic fracture mandates cystography.

Step-by-Step Solution

1

Assess hemodynamic stability.

Patients are divided into stable and unstable categories.

Hemodynamic instability dictates immediate life-saving interventions over delayed, higher-resolution imaging like CT.

2

Evaluate unstable patients based on FAST results.

Unstable presentation with a positive FAST leads to exploratory laparotomy. Unstable presentation with a negative FAST and pelvic fracture leads to pelvic angiography.

A positive FAST in an unstable patient confirms intra-abdominal hemorrhage. A negative FAST shifts suspicion to retroperitoneal bleeding, which is managed with angiography or extraperitoneal packing.

3

Evaluate stable patients based on mechanism and specific physical findings.

Stable blunt trauma goes to CT. Left thoracoabdominal penetrating trauma goes to laparoscopy. Gross hematuria goes to cystography.

Stable patients can tolerate specific diagnostic workups to uncover occult injuries, such as diaphragmatic tears, hollow viscus injuries, or bladder ruptures.

Key Concept

Algorithmic management of torso trauma based on hemodynamic stability, mechanism of injury, and FAST results.

Question 9Question →

Match each specific burn or environmental injury presentation with the most appropriate immediate or targeted management step.

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Answer

The correct matches pair inhalational injury with early intubation, circumferential burns causing ischemia with escharotomy, electrical injury rhabdomyolysis with aggressive fluid resuscitation, and hydrofluoric acid burns with calcium gluconate.

Each specific burn presentation carries a unique, immediate threat that dictates the next best step: airway loss (inhalational injury) requires intubation; limb ischemia (circumferential burn) requires escharotomy; acute kidney injury (electrical rhabdomyolysis) requires aggressive fluids; and hypocalcemic tissue necrosis (hydrofluoric acid) requires topical calcium.

Step-by-Step Solution

1

Analyze the firefighter's presentation (enclosed fire, carbonaceous sputum, hoarseness).

Identify high risk for imminent airway obstruction from inhalational injury.

Supraglottic edema can progress rapidly and make delayed intubation impossible.

2

Evaluate the industrial worker's pulseless limb with a leathery burn.

Identify burn-induced compartment syndrome.

The inelastic eschar prevents tissue expansion as edema forms, requiring surgical release (escharotomy).

3

Assess the electrician with dark urine following a high-voltage shock.

Identify myoglobinuria secondary to rhabdomyolysis.

Electrical current travels through deep tissues (muscle/bone), causing massive necrosis. Aggressive fluid resuscitation prevents pigment nephropathy.

4

Analyze the laboratory technician's pain out of proportion to visible injury.

Identify hydrofluoric acid exposure.

Fluoride ions penetrate tissue and deplete local calcium, causing severe nerve pain and tissue death, necessitating calcium gluconate therapy.

Key Concept

Immediate management of specific life- and limb-threatening burn complications

Question 10Question →

A $19$ -year-old male college student is brought to the emergency department $30$ minutes after a bicycle accident. He was riding down a steep trail when he lost control, flipped over the handlebars, and struck his left upper abdomen against a large rock. He complains of severe abdominal pain and pain radiating to his left shoulder. His temperature is $36.8^{\circ}\text{C}$ ( $98.2^{\circ}\text{F}$ ), blood pressure is $82/50$ mm Hg, pulse is $130$ /min, and respirations are $24$ /min. Pulse oximetry shows $98\%$ on room air. He appears pale and diaphoretic. Physical examination reveals ecchymosis over the left upper quadrant. The abdomen is distended, rigid, and diffusely tender with involuntary guarding. A focused assessment with sonography for trauma (FAST) exam demonstrates a large anechoic stripe in the splenorenal recess and hepatorenal recess. Two large-bore intravenous lines are established, and fluid resuscitation with $1$ L of warmed crystalloid is initiated. Repeat blood pressure is $84/52$ mm Hg. Which of the following is the most appropriate next step in management?

Computed tomography of the abdomen and pelvis with intravenous contrast

Immediate exploratory laparotomy

Diagnostic peritoneal lavage

Angiography with selective splenic artery embolization

Admission to the surgical intensive care unit for serial abdominal examinations

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy

This patient has suffered blunt abdominal trauma and presents with hemodynamic instability (hypotension, tachycardia) and signs of peritonitis. The positive FAST exam confirms the presence of intra-abdominal hemorrhage. The pain radiating to the left shoulder (Kehr sign) strongly suggests a splenic rupture. In a hemodynamically unstable patient with a positive FAST exam, the definitive management is immediate exploratory laparotomy to identify and control the source of bleeding. Fluid resuscitation is a temporizing measure, and the failure to normalize vital signs after initial fluid administration further mandates emergent surgical intervention.

Step-by-Step Solution

1

Identify the primary mechanism of injury and the patient's hemodynamic status.

The patient suffered blunt abdominal trauma and presents with hemodynamic instability (blood pressure

82/50

mm Hg, pulse

130

/min) that does not significantly improve after an initial fluid bolus.

Determining hemodynamic stability is the critical branch point in the Advanced Trauma Life Support (ATLS) algorithm for managing blunt abdominal trauma.

2

Evaluate the physical examination findings and the results of the initial diagnostic adjuncts.

The patient has a rigid abdomen with peritonitis, Kehr sign (referred left shoulder pain suggesting splenic injury), and a positive FAST exam showing free intra-abdominal fluid.

A positive FAST exam in the setting of hypovolemic shock reliably indicates significant intraperitoneal hemorrhage as the cause of the instability.

3

Determine the appropriate definitive management based on the ATLS treatment algorithm.

Immediate exploratory laparotomy is required.

Hemodynamically unstable patients with confirmed intra-abdominal bleeding require emergent surgical intervention to identify and stop the hemorrhage. Diagnostic delays are contraindicated.

Key Concept

Hemodynamically unstable patients with blunt abdominal trauma and a positive FAST exam require immediate exploratory laparotomy.

Question 11Question →

A 28-year-old woman is brought to the trauma bay by emergency medical services after being ejected from a motorcycle at highway speeds. She is confused, tachypneic, and covered in significant abrasions. According to Advanced Trauma Life Support (ATLS) principles, arrange the following initial assessment and management steps in the correct chronological order.

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Answer

The correct sequence follows the ATLS primary survey: Airway (with cervical spine protection), Breathing, Circulation, Disability, and Exposure.

The Advanced Trauma Life Support (ATLS) primary survey is strictly ordered to address the most immediate life-threatening conditions first. The sequence is Airway (with cervical spine protection), Breathing, Circulation, Disability, and Exposure. An unsecured airway kills most rapidly, followed by breathing failure (e.g., tension pneumothorax), then hemorrhagic shock, then expanding intracranial lesions.

Step-by-Step Solution

1

Prioritize Airway

Airway patency is assessed while immobilizing the cervical spine.

An unsecured airway is the most rapid and immediate cause of traumatic death.

2

Assess Breathing

Breath sounds and chest wall motion are evaluated.

Once the airway is open, adequate oxygenation and ventilation must be ensured to prevent hypoxia.

3

Evaluate Circulation

Intravenous access is established and perfusion is checked.

After ensuring oxygenation, circulation must be supported and hemorrhage controlled to prevent shock.

4

Determine Disability

Glasgow Coma Scale score and pupils are assessed.

A rapid neurologic baseline is established only after respiratory and circulatory life threats are addressed.

5

Perform Exposure

The patient is completely undressed and kept warm.

Complete examination prevents missed injuries, while blankets prevent trauma-induced coagulopathy from hypothermia.

Key Concept

Advanced Trauma Life Support (ATLS) Primary Survey Sequence (ABCDE)

Question 12Question →

A 24-year-old man is brought to the emergency department via ambulance after sustaining a gunshot wound to his left thigh. On arrival, he is diaphoretic and confused. His temperature is $36.8^\circ\text{C}$ ( $98.2^\circ\text{F}$ ), blood pressure is $82/50\text{ mm Hg}$ , heart rate is $134/\text{min}$ , and respiratory rate is $22/\text{min}$ . Physical examination reveals a single penetrating wound on the anteromedial aspect of the left distal thigh. There is a rapidly expanding, pulsatile hematoma surrounding the wound, and bright red blood is actively spurting from the site. The left foot is pale and cold to the touch. The dorsalis pedis and posterior tibial pulses are not palpable on the left but are $2+$ on the right. Intravenous access is established, and isotonic fluid resuscitation is initiated. Which of the following is the most appropriate next step in management?

Computed tomography angiography of the lower extremities

Measurement of the ankle-brachial index

Immediate operative exploration

Duplex ultrasonography of the left lower extremity

Local wound exploration in the emergency department

Show answer & explanation

Answer: Immediate operative exploration

Answer

Immediate operative exploration

The correct answer is immediate operative exploration. This patient presents with a penetrating extremity injury and classic 'hard signs' of vascular injury, which include active pulsatile bleeding, an expanding or pulsatile hematoma, absent distal pulses, palpable thrill or audible bruit, and signs of distal ischemia (pallor, paresthesia, paralysis). The presence of any single hard sign—and particularly multiple hard signs combined with hemodynamic instability (hypotension, tachycardia, altered mental status)—mandates emergent surgical intervention in the operating room for hemorrhage control and vascular repair. Any delay to obtain imaging is contraindicated and potentially fatal.

Step-by-Step Solution

1

Identify the patient's hemodynamic status.

The patient has a blood pressure of

82/50\text{ mm Hg}

and a heart rate of

134/\text{min}

, indicating hemodynamic instability and hemorrhagic shock.

Hemodynamic status dictates whether the patient can safely undergo imaging or requires immediate intervention.

2

Evaluate the clinical signs associated with the extremity wound.

The patient exhibits active pulsatile bleeding, an expanding hematoma, absent distal pulses, and distal ischemia (cold, pale foot).

These findings are classic 'hard signs' of arterial injury.

3

Determine the appropriate clinical pathway based on findings.

The presence of hard signs of vascular injury, especially combined with hemorrhagic shock, necessitates emergent transport to the operating room.

Any delay for imaging or bedside procedures in this scenario can lead to exsanguination or irreversible limb ischemia.

Key Concept

Management of penetrating extremity trauma requires immediate operative exploration when hard signs of vascular injury or hemodynamic instability are present.

Question 13Question →

Match each clinical trauma presentation with the most appropriate immediate diagnostic or therapeutic intervention.

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Answer

Penetrating neck trauma with hard signs requires immediate surgical exploration. Tension pneumothorax requires needle decompression. Unstable abdominal trauma with a positive FAST requires an exploratory laparotomy. A stable patient with suspected blunt aortic injury requires CT angiography.

Each matching pair aligns precisely with established ATLS protocols. Patients with signs of impending airway collapse or exsanguinating hemorrhage (e.g., hard signs of neck trauma, unresuscitatable shock with a positive FAST, or tension pneumothorax) require immediate manual or operative intervention. Conversely, stable patients with concerning mechanisms or plain film findings (e.g., widened mediastinum) require high-resolution imaging such as CT angiography to define the precise nature and extent of the injury prior to management.

Step-by-Step Solution

1

Evaluate the hemodynamic status and primary survey findings of each patient.

Identify patients who are hemodynamically unstable or have hard signs of immediate life-threatening injuries versus those who are stable.

Hemodynamic stability is the primary decision point in Advanced Trauma Life Support (ATLS) algorithms, dictating whether a patient goes to the operating room or the CT scanner.

2

Match clinical findings to classic trauma diagnoses and their algorithmic pathways.

Recognize expanding hematoma/stridor as hard signs of neck injury, hypotension/JVD/absent breath sounds as a tension pneumothorax, hypotension/positive FAST as intra-abdominal hemorrhage, and widened mediastinum in a stable patient as requiring aortic evaluation.

Classic clinical presentations allow for immediate life-saving procedures (surgical exploration, thoracostomy, laparotomy) or appropriate advanced imaging (CT angiography).

Key Concept

Advanced Trauma Life Support (ATLS) algorithms dictate that hemodynamically unstable patients or those with 'hard signs' of vascular/airway injury require immediate therapeutic intervention or surgery, whereas stable patients should undergo advanced diagnostic imaging.

Estimated Time:2m 0s

Question 14Question →

A 45-year-old woman is brought to the emergency department after being thrown from a horse. She was wearing a helmet but landed forcefully on her back. Upon arrival, she is immobilized on a rigid backboard with a cervical collar. She is conscious and alert but reports an inability to move her legs and a lack of sensation below her chest. Vital signs reveal a blood pressure of $78/42$ mmHg, a heart rate of $54$ /min, and a respiratory rate of $16$ /min. Oxygen saturation is $98\%$ on room air. Physical examination demonstrates warm, flushed skin in the upper and lower extremities. Pulses are bounding. Which of the following is the most likely etiology of this patient's hemodynamic findings?

Disruption of descending sympathetic pathways

Acute hemorrhage into the retroperitoneal cavity

Accumulation of pressurized air in the pleural space

Rapid accumulation of blood in the pericardial sac

Systemic inflammatory response to an invasive pathogen

Show answer & explanation

Answer: Disruption of descending sympathetic pathways

Answer

Disruption of descending sympathetic pathways

This patient's presentation of hypotension, bradycardia, and warm extremities following significant spinal trauma (paraplegia, loss of sensation) is classic for neurogenic shock. Spinal cord injury above the level of T1-T4 can disrupt descending sympathetic pathways. This leads to a loss of sympathetic vascular tone, resulting in massive peripheral vasodilation (causing hypotension and warm, flushed skin). Furthermore, the loss of sympathetic innervation to the heart leaves parasympathetic (vagal) tone unopposed, preventing the expected compensatory tachycardia and instead causing bradycardia.

Step-by-Step Solution

1

Analyze the patient's vital signs and physical examination findings.

The patient is hypotensive (

78/42

mmHg), bradycardic (

54

/min), and has warm, flushed skin.

Identifying the specific pattern of hemodynamic derangement is essential to determine the type of shock.

2

Correlate the hemodynamic pattern with the mechanism of injury.

The patient suffered blunt spinal trauma resulting in paraplegia and sensory loss below the chest. The combination of acute spinal cord injury, hypotension, and bradycardia defines neurogenic shock.

Trauma patients frequently experience hypovolemic shock, but the presence of bradycardia and warm extremities points directly to a neurogenic etiology.

3

Identify the pathophysiologic mechanism of neurogenic shock.

Neurogenic shock occurs due to the interruption of autonomic descending sympathetic tracts in the spinal cord, leading to unopposed parasympathetic (vagal) tone.

Loss of sympathetic tone causes peripheral vasodilation (producing warm skin and hypotension) and prevents the expected compensatory tachycardia, resulting in bradycardia.

Key Concept

Neurogenic shock is characterized by hypotension, bradycardia, and warm extremities due to the loss of sympathetic vascular tone following a spinal cord injury.

Estimated Time:1m 0s

Question 15Question →

A 25-year-old man is brought to the emergency department after a high-speed motor vehicle collision. He is unresponsive and has sustained multiple injuries. According to the Advanced Trauma Life Support (ATLS) protocol, arrange the following initial management steps of the primary survey in the correct chronological order.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is: Airway and C-spine control, Breathing and ventilation, Circulation and hemorrhage control, Disability (neurologic exam), and Exposure/environmental control.

The Advanced Trauma Life Support (ATLS) protocol utilizes the ABCDE algorithm for the primary survey to systematically identify and treat the most immediately life-threatening conditions. The mandatory chronological order is: Airway maintenance with cervical spine protection, Breathing and ventilation, Circulation with hemorrhage control, Disability (rapid neurologic evaluation), and Exposure/environmental control.

Step-by-Step Solution

1

Identify the standard protocol for initial trauma assessment.

The scenario requires the ATLS primary survey approach.

ATLS provides a structured algorithm to identify and treat the most immediately life-threatening injuries first.

2

Apply the ABCDE mnemonic to the given clinical actions.

A = Airway, B = Breathing, C = Circulation, D = Disability, E = Exposure.

This mnemonic dictates the strict chronological order of the primary survey.

3

Arrange the steps according to the ABCDE sequence.

The airway must be secured first, followed by ventilation, then circulation/shock assessment, then neurologic status, and finally complete exposure.

Failure to follow this order can lead to preventable mortality, as an unprotected airway will quickly result in fatal hypoxia regardless of other interventions.

Key Concept

ATLS Primary Survey (ABCDE Algorithm)

Question 16Question →

Paramedics bring a 35-year-old male to the emergency department after he was rescued from a residential fire. The patient weighs 75 kg. According to the paramedics, the burn injury occurred exactly 2 hours prior to arrival. Physical examination reveals deep partial-thickness and full-thickness burns covering his entire posterior trunk and both of his entire upper extremities. The remainder of his skin is intact. Two large-bore intravenous lines are established.

Using the traditional Parkland formula ( $4$ mL/kg/% total body surface area), what should be the intravenous fluid administration rate (in mL/hr) prescribed for the remaining time to complete the first 8-hour post-injury resuscitation goal?

Show answer & explanation

Answer: 900

Answer

900

The traditional Parkland formula is calculated as

4

mL of crystalloid per kg of body weight per percentage of TBSA burned. For this 75 kg patient with 36% TBSA burns (18% for the entire posterior trunk + 9% for each upper extremity), the total 24-hour fluid requirement is

4 \times 75 \times 36 = 10,800

mL. Half of this volume (

5,400

mL) must be administered within the first 8 hours from the time of the burn. Because the injury occurred 2 hours prior to arrival, only 6 hours remain in this initial window. Therefore, the

5,400

mL must be infused over 6 hours, requiring a rate of

900

mL/hr.

Step-by-Step Solution

1

Calculate the burned Total Body Surface Area (TBSA) using the Rule of Nines.

18% (posterior trunk) + 9% (right arm) + 9% (left arm) = 36% TBSA.

The Parkland formula requires an accurate estimation of the total burn surface area.

2

Calculate the total 24-hour fluid resuscitation volume using the traditional Parkland formula.

4 mL/kg × 75 kg × 36% = 10,800 mL.

This establishes the total volume of Lactated Ringer's needed for the first 24 hours after the injury.

3

Determine the fluid volume required for the first 8 hours.

10,800 mL / 2 = 5,400 mL.

Standard burn resuscitation guidelines dictate that 50% of the calculated 24-hour volume is given in the first 8 hours post-injury.

4

Calculate the intravenous fluid rate based on the elapsed time since the injury.

5,400 mL / (8 hours - 2 hours) = 5,400 mL / 6 hours = 900 mL/hr.

The first 8-hour window begins at the time of injury, not at the time of hospital admission. Because 2 hours have already elapsed, the fluid must be infused over the remaining 6 hours.

Key Concept

Burn fluid resuscitation calculations must account for the time elapsed since the injury when setting the infusion rate for the first 8 hours.

Question 17Question →

Match each thoracic trauma clinical presentation to the most appropriate next step in diagnosis or definitive management based on Advanced Trauma Life Support (ATLS) principles.

Click a left item, then click its matching right item

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Answer

The presentations map to their respective ATLS interventions: cardiac tamponade requires pericardial decompression, flail chest requires pain management and positive pressure ventilation, tracheobronchial injury requires fiberoptic bronchoscopy, and massive hemothorax requires an emergent thoracotomy.

Each clinical scenario corresponds to a classic 'lethal six' thoracic injury that requires prompt recognition and targeted management. Cardiac tamponade is managed with immediate pericardial decompression. Flail chest relies on excellent analgesia and ventilatory support to correct hypoxia without surgical fixation in the acute setting. Tracheobronchial injuries manifest with massive air leaks, making bronchoscopy essential for localization. Finally, a massive hemothorax (>1,500 mL initially) mandates emergent exploratory thoracotomy to surgically arrest the hemorrhage.

Step-by-Step Solution

1

Analyze the first clinical presentation: left parasternal stab wound with Beck's triad.

Identified as cardiac tamponade.

Hypotension, jugular venous distention, and muffled heart sounds after penetrating chest trauma classically denote pericardial fluid accumulation.

2

Analyze the second presentation: blunt trauma with paradoxical chest wall movement.

Identified as flail chest.

Paradoxical motion occurs when a segment of the rib cage fractures in multiple places and detaches from the bony thorax.

3

Analyze the third presentation: blunt trauma with massive continuous air leak.

Identified as a tracheobronchial tree injury.

A persistent air leak failing to resolve with a chest tube indicates a major breach in the large airways.

4

Analyze the fourth presentation: penetrating trauma with 1,600 mL initial chest tube output.

Identified as massive hemothorax.

Initial chest tube drainage exceeding 1,500 mL of blood strictly meets the definition for a massive hemothorax.

5

Map each identified condition to its definitive ATLS management guideline.

Cardiac tamponade to decompression, flail chest to pain control/ventilation, tracheobronchial injury to bronchoscopy, and massive hemothorax to thoracotomy.

Applying standard trauma algorithms ensures immediate stabilization of life-threatening thoracic injuries.

Key Concept

Advanced Trauma Life Support (ATLS) diagnostic and therapeutic algorithms for life-threatening thoracic injuries.

Question 18Question →

Match each clinical trauma presentation with the most appropriate immediate diagnostic modality or therapeutic intervention.

Click a left item, then click its matching right item

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Answer

The presentations map to interventions based on hemodynamic stability and mechanism: hard signs of neck trauma require cervical intervention, unstable pelvic trauma without intraperitoneal fluid requires angiographic embolization or packing, unstable abdominal trauma with a positive FAST requires celiotomy, and stable blunt trauma requires cross-sectional imaging.

The correct pairings rely on core ATLS algorithms. Hard signs of penetrating neck trauma (stridor, expanding hematoma) require immediate operative exploration. In blunt trauma, hemodynamic stability dictates the pathway. Stable patients undergo CT scanning to diagnose specific injuries. Unstable patients undergo a FAST exam; a positive FAST leads to urgent celiotomy for intraperitoneal bleeding. If the FAST is negative in the setting of an unstable pelvic fracture, the bleeding is likely retroperitoneal, which is managed via angiographic embolization or preperitoneal packing.

Step-by-Step Solution

1

Evaluate the hemodynamic stability and airway status of each patient.

Patients 1, 2, and 3 have unstable vitals or impending airway compromise, whereas Patient 4 is hemodynamically stable.

Hemodynamic status is the primary branch point in trauma algorithms, determining if a patient can safely tolerate time-consuming imaging.

2

Identify the primary source or threat causing the instability.

Patient 1 has a cervical vascular/airway threat, Patient 2 has a retroperitoneal pelvic source, and Patient 3 has an intraperitoneal abdominal source.

The specific anatomical region of bleeding dictates the appropriate definitive intervention.

3

Select the guideline-concordant intervention for each presentation.

Unstable cervical trauma requires neck exploration. Unstable pelvic trauma without intraperitoneal fluid requires pelvic packing or angioembolization. Unstable abdominal trauma with positive FAST requires celiotomy. Stable abdominal trauma requires CT imaging.

Adhering to Advanced Trauma Life Support (ATLS) principles ensures rapid hemorrhage control and prevents avoidable trauma mortality.

Key Concept

Application of Advanced Trauma Life Support (ATLS) algorithms based on hemodynamic stability and specific injury patterns.

Question 19Question →

Match each clinical presentation of a trauma patient with the most appropriate next step in definitive management or diagnostic workup.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The unstable patient with a penetrating abdominal wound requires immediate exploratory laparotomy. The stable patient with blunt trauma and a positive FAST requires a CT scan. The unstable patient with a pelvic crush injury and negative FAST requires a pelvic binder and angiography. The patient with hard signs of vascular injury requires immediate operative vascular exploration.

The correct pairings rely on strict adherence to ATLS algorithms. Unstable penetrating abdominal injuries require laparotomy. Stable patients with positive FAST from blunt trauma undergo CT imaging to grade solid organ injuries. Unstable blunt pelvic injuries with negative FAST necessitate pelvic binding and angiography. Extremity wounds with hard signs of vascular injury require operative exploration.

Step-by-Step Solution

1

Analyze the mechanism of injury and hemodynamic status for each patient.

Patients 1 and 3 are hemodynamically unstable. Patients 2 and 4 are stable.

Hemodynamic stability is the critical branch point in determining whether a patient needs immediate operative intervention or further imaging.

2

Evaluate the unstable patients (1 and 3).

Patient 1 (penetrating abdominal wound) requires an immediate laparotomy. Patient 3 (blunt pelvic trauma with negative FAST) requires a pelvic binder and angiography to address retroperitoneal bleeding.

Unstable penetrating abdominal injuries bypass imaging. Unstable blunt injuries without intraperitoneal fluid (negative FAST) strongly suggest pelvic retroperitoneal hemorrhage.

3

Evaluate the stable patients (2 and 4).

Patient 2 (positive FAST) is stable, allowing for a CT scan. Patient 4 has 'hard signs' of vascular injury, necessitating immediate surgery despite stable vital signs.

Stable patients with positive FAST can be further evaluated to avoid unnecessary surgery. Hard signs of vascular injury always mandate immediate surgical exploration.

Key Concept

Advanced Trauma Life Support (ATLS) algorithms prioritize hemodynamic stability, mechanism of injury (blunt vs. penetrating), and the presence of hard signs to dictate the choice between immediate surgical intervention, mechanical stabilization, and advanced imaging.

Question 20Question →

A 28-year-old man is brought to the emergency department after a high-speed motorcycle collision. He is unresponsive and making gurgling respiratory sounds. His blood pressure is $72/40 \text{ mm Hg}$ , pulse is $142\text{/min}$ , and respiratory rate is $34\text{/min}$ . Physical examination reveals severe maxillofacial crush injuries with active oropharyngeal hemorrhage. The trachea is deviated to the left, and breath sounds are absent over the right hemithorax. The pelvis is mechanically unstable on anteroposterior compression.

Arrange the following acute management steps in the correct chronological sequence according to standard trauma resuscitation protocols.

Drag items to arrange them in the correct order

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Answer

The correct sequence follows the ATLS ABCDE primary survey: 1) Secure the airway with a surgical cricothyroidotomy, 2) Perform a right-sided chest decompression, 3) Establish intravenous access and apply a pelvic binder, 4) Perform a focused assessment with sonography for trauma (FAST), and 5) Conduct a comprehensive head-to-toe secondary survey.

Trauma resuscitation strictly follows the ABCDE paradigm to address injuries in the order they are most likely to cause death. This patient has multiple life-threatening injuries. The maxillofacial crush injury and active bleeding threaten the airway (A), demanding a surgical cricothyroidotomy first. The absent breath sounds and deviated trachea indicate a tension pneumothorax (Breathing - B), requiring immediate chest decompression second. The hypotension and unstable pelvis indicate massive hemorrhage (Circulation - C), requiring IV access and a pelvic binder third. Only after ABCs are managed should primary survey adjuncts like the FAST exam be performed, finally followed by the comprehensive head-to-toe secondary survey once the patient is stabilized.

Step-by-Step Solution

1

Address Airway (A)

Surgical cricothyroidotomy is performed.

The patient is unresponsive with gurgling respirations, active oropharyngeal bleeding, and severe maxillofacial trauma. Standard endotracheal intubation is contraindicated or likely to fail, making a surgical airway the most immediate life-saving maneuver.

2

Address Breathing (B)

Right-sided needle or finger thoracostomy is performed.

Following airway securement, ventilation must be established. Absent breath sounds on the right and leftward tracheal deviation are clinical signs of a right-sided tension pneumothorax, requiring immediate decompression before further assessment.

3

Address Circulation (C)

Intravenous access is established, and a pelvic binder is applied.

With a secured airway and decompressed chest, hemorrhagic shock must be managed. The mechanically unstable pelvis is a major source of bleeding; applying a binder and initiating fluid/blood resuscitation are critical circulatory interventions.

4

Perform Primary Survey Adjuncts

FAST examination is conducted.

Adjuncts such as FAST and initial trauma radiographs (chest/pelvis) are performed simultaneously with or immediately following the ABCs to identify other hidden sources of bleeding (e.g., intra-abdominal hemorrhage).

5

Proceed to the Secondary Survey

A comprehensive head-to-toe physical examination is completed.

The secondary survey is only indicated once the primary survey is complete, life-threatening injuries have been managed, and the patient demonstrates a degree of physiological stabilization.

Key Concept

Advanced Trauma Life Support (ATLS) ABCDE Sequence

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