Trauma and Burns

283 questions

All types283 Multiple choice148 Numeric38 Matching52 Ordering45

A 21-year-old male university student is rushed to the emergency department after a severe collision during a rugby game, where he was forcefully struck in the left flank by an opponent's shoulder. He reports intense left-sided abdominal pain with radiation to the top of his left shoulder. His temperature is $36.9^\circ\text{C}$ ( $98.4^\circ\text{F}$ ), pulse is $132 \text{ beats/min}$ , respirations are $24 \text{ breaths/min}$ , and blood pressure is $80/46 \text{ mmHg}$ . He is conscious but profusely diaphoretic and pale. Examination shows prominent guarding and rigidity over the left hemi-abdomen. The pelvis is mechanically stable, and chest auscultation is clear bilaterally. A bedside point-of-care ultrasound demonstrates significant free anechoic fluid in the splenorenal and hepatorenal spaces. Resuscitation with uncrossmatched blood products is initiated via two large-bore peripheral catheters. Which of the following is the most appropriate next step in this patient's management?

Transfer to the operating room for celiotomy

Multidetector computed tomography of the abdomen with intravenous contrast

Diagnostic peritoneal lavage

Splenic angiography with transcatheter embolization

Serial abdominal examinations and critical care admission

Show answer & explanation

Answer: Transfer to the operating room for celiotomy

Answer

The correct answer is to transfer the patient to the operating room for immediate surgical exploration (celiotomy).

The correct answer is surgical exploration. This patient has sustained blunt abdominal trauma and is hemodynamically unstable due to hemorrhagic shock. The positive point-of-care ultrasound confirms free intraperitoneal fluid, which in this clinical context represents active bleeding from a solid organ injury (likely a ruptured spleen, given the left flank impact and referred left shoulder pain known as Kehr's sign). Standard trauma guidelines dictate that a hemodynamically unstable patient with a positive ultrasound for hemoperitoneum must be taken directly to the operating room for emergency celiotomy to achieve hemostasis.

Step-by-Step Solution

Evaluate the patient's hemodynamic stability and clinical signs.

The patient is in hemorrhagic shock, evidenced by significant hypotension (

80/46 \text{ mmHg}

) and tachycardia (

132 \text{ beats/min}

), along with signs of peritonitis (guarding, rigidity).

Hemodynamic status determines whether a trauma patient can undergo cross-sectional imaging or requires immediate intervention.

Interpret the results of the initial diagnostic adjuncts.

The point-of-care ultrasound is positive for free anechoic fluid in multiple spaces, indicating hemoperitoneum.

Identifying the source of bleeding in an unstable patient directs the appropriate surgical or interventional response.

Select the most appropriate definitive management.

The patient must be taken to the operating room for a celiotomy (laparotomy).

According to advanced trauma life support protocols, the combination of hemodynamic instability and confirmed intra-abdominal bleeding is an absolute indication for emergency surgical hemostasis.

Key Concept

Management of hemodynamically unstable blunt abdominal trauma requires immediate surgical exploration when intra-abdominal bleeding is confirmed.

Estimated Time:1m 0s

Question 82Question →

Match each acute thoracic trauma clinical presentation with the most appropriate immediate next step in management.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The correct matches align the classic clinical signs of life-threatening thoracic injuries with their protocol-directed primary interventions.

Each pair correctly matches a classic thoracic trauma presentation with its definitive initial intervention: tension pneumothorax requires decompression, cardiac tamponade requires pericardiocentesis, open pneumothorax requires an occlusive dressing, and flail chest requires pain control and respiratory support.

Step-by-Step Solution

Analyze each clinical vignette to establish the most likely diagnosis based on classic physical exam findings.

Identify tension pneumothorax, cardiac tamponade, open pneumothorax, and flail chest.

Accurate clinical diagnosis is the prerequisite for selecting the correct life-saving intervention without delaying for imaging.

Determine the initial management step for each identified condition based on trauma primary survey protocols.

Decompression for tension pneumothorax, fluid evacuation for tamponade, a one-way valve dressing for open pneumothorax, and respiratory support for flail chest.

Trauma management follows a specific sequence prioritizing immediate threats to airway, breathing, and circulation.

Key Concept

Initial management of life-threatening thoracic trauma during the primary survey.

Question 83Question →

An ambulance brings a 27-year-old female to the emergency department after she was thrown from a horse, landing forcefully on her left side. She is fully alert and complains of severe left-sided abdominal pain. Her temperature is 36.8°C (98.2°F), blood pressure is 78/42 mm Hg, pulse is 138/min, and respiratory rate is 22/min. Physical examination reveals guarding and rigidity in the left upper quadrant. Intravenous fluid resuscitation is initiated with 1 liter of warm crystalloid, but a repeat blood pressure reading is 80/45 mm Hg. A focused assessment with sonography for trauma (FAST) demonstrates a large amount of anechoic fluid in the splenorenal recess. Which of the following is the most appropriate next step in management?

Computed tomography scan of the abdomen and pelvis

Immediate surgical exploration

Diagnostic peritoneal lavage

Percutaneous angiography with embolization

Admission to the intensive care unit for serial examinations

Show answer & explanation

Answer: Immediate surgical exploration

Answer

Immediate surgical exploration is required for a hemodynamically unstable patient with a positive FAST exam following blunt abdominal trauma.

The correct answer is immediate surgical exploration. The patient has sustained blunt abdominal trauma and is in hemorrhagic shock, evidenced by persistent hypotension and tachycardia despite an initial fluid bolus. The positive FAST exam localizes the bleeding to the peritoneal cavity (likely splenic rupture). According to Advanced Trauma Life Support (ATLS) guidelines, a hemodynamically unstable patient with a positive FAST exam must be taken immediately to the operating room to achieve hemorrhage control.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient is hypotensive (BP 78/42 mm Hg) and tachycardic (pulse 138/min), and remains unstable after receiving 1 liter of intravenous crystalloid fluids.

Hemodynamic stability is the primary decision point in the ATLS algorithm for blunt abdominal trauma.

Evaluate the results of the initial diagnostic workup.

The FAST exam is positive, showing anechoic fluid in the splenorenal recess, which indicates intraperitoneal hemorrhage.

A positive FAST in the setting of instability confirms the abdomen as the source of life-threatening bleeding.

Determine the definitive management.

The patient must be taken for immediate surgical exploration.

Hemodynamically unstable patients with confirmed intraperitoneal bleeding require immediate operative hemorrhage control.

Key Concept

Patients with blunt abdominal trauma who are hemodynamically unstable and have a positive FAST examination require immediate surgical exploration.

Estimated Time:1m 0s

Question 84Question →

A 45-year-old man is brought to the emergency department 30 minutes after falling from a 3-story building. He is confused and moaning in pain. His temperature is 36.2°C (97.2°F), blood pressure is 75/40 mm Hg, heart rate is 135/min, and respiratory rate is 24/min. The airway is patent, and breath sounds are clear and equal bilaterally. A portable chest radiograph is unremarkable. A portable pelvic radiograph demonstrates a 4.5-cm diastasis of the pubic symphysis. A pelvic binder is immediately applied and secured appropriately. Focused assessment with sonography for trauma (FAST) demonstrates a large volume of anechoic fluid in the hepatorenal and splenorenal recesses. The patient receives 2 units of uncrossmatched packed red blood cells and 2 units of fresh frozen plasma via a rapid infusion device. Following the transfusion, his blood pressure is 78/42 mm Hg and heart rate is 130/min. Which of the following is the most appropriate next step in management?

Immediate exploratory laparotomy

Computed tomography of the abdomen and pelvis

Pelvic angiography with embolization

Immediate preperitoneal pelvic packing

Diagnostic peritoneal lavage

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy

The most appropriate next step in management is immediate exploratory laparotomy. This patient is in severe hemorrhagic shock due to blunt trauma and is a non-responder to initial damage-control resuscitation (pelvic binder application and massive transfusion protocol initiation). The unequivocally positive FAST scan indicates significant intra-abdominal hemorrhage. According to Advanced Trauma Life Support (ATLS) guidelines, a hemodynamically unstable patient with a positive FAST requires an emergent exploratory laparotomy to surgically control the bleeding. Although the patient has a concurrent life-threatening 'open-book' pelvic fracture, the intra-abdominal bleeding takes immediate surgical priority. During the laparotomy, if the patient remains hemodynamically unstable from suspected retroperitoneal pelvic bleeding, concurrent preperitoneal pelvic packing can be performed in the operating room.

Step-by-Step Solution

Identify the patient's hemodynamic status.

The patient is in Class III/IV hemorrhagic shock (BP 75/40 mm Hg, HR 135/min) and is a non-responder to initial damage-control resuscitation (binder and blood products).

Establishing hemodynamic instability dictates the urgency and type of subsequent interventions.

Assess the sources of hemorrhage.

There are two major sources identified: severe pelvic fracture (diastasis of the pubic symphysis) and intra-abdominal injury (positive FAST).

Multiple sources of hemorrhage require prioritization based on ATLS guidelines.

Determine the priority of intervention.

Immediate exploratory laparotomy is chosen as the next step.

In the presence of a positive FAST and hemodynamic instability, intra-abdominal hemorrhage control takes absolute precedence over isolated pelvic interventions.

Key Concept

In hemodynamically unstable blunt trauma patients with multiple sources of hemorrhage (e.g., severe pelvic fracture and positive FAST), exploratory laparotomy is the mandatory next step to control intra-abdominal bleeding.

Estimated Time:1m 30s

Question 85Question →

A 50-year-old construction worker is evacuated by helicopter to the trauma center following a localized industrial explosion. The patient weighs $80\text{ kg}$ . Paramedics report the incident occurred exactly $2\text{ hours}$ prior to arrival. Primary survey reveals a patent airway with no signs of inhalation injury, clear breath sounds bilaterally, and a heart rate of $115\text{ beats/min}$ . Secondary survey is notable for deep partial-thickness and full-thickness thermal burns covering the entirety of his posterior trunk (including buttocks), his entire left lower extremity, and his entire right upper extremity. Superficial (first-degree) burns are noted on his face but are not blistering. Large-bore intravenous access is established. The trauma team initiates fluid resuscitation using lactated Ringer solution according to current Advanced Trauma Life Support (ATLS) guidelines ( $2\text{ mL/kg/\%TBSA}$ for adult thermal burns).

What should be the initial rate of the fluid infusion (in $\text{mL/hr}$ ) programmed on the intravenous pump for the time remaining in the first 8-hour post-injury window?

Show answer & explanation

Answer: 600

Answer

600

The correct calculation requires summing the TBSA (

18\%

posterior trunk +

18\%

left leg +

9\%

right arm =

45\%

), multiplying by

80\text{ kg}

and

2\text{ mL}

(totaling

7,200\text{ mL}

for 24 hours), dividing in half for the first 8 hours (

3,600\text{ mL}

), and dividing by the

6

hours remaining in that window (

3,600\text{ mL} / 6\text{ hr} = 600\text{ mL/hr}

Step-by-Step Solution

Calculate affected Total Body Surface Area (TBSA)

45\%

Using the Rule of Nines: Posterior trunk is

18\%

, left leg is

18\%

, and right arm is

9\%

. Superficial burns are not included in TBSA calculations for fluid resuscitation.

Calculate total 24-hour fluid requirement

7,200\text{ mL}

Formula:

2\text{ mL} \times 80\text{ kg} \times 45 = 7,200\text{ mL}

Determine fluid volume for the first 8 hours

3,600\text{ mL}

Half (

50\%

) of the total 24-hour volume is administered during the first 8 hours post-injury.

Calculate infusion rate for the remaining time in the first 8-hour window

600\text{ mL/hr}

The injury occurred

2

hours prior to arrival, leaving

6

hours (

8 - 2 = 6

) in the initial window. Rate =

3,600\text{ mL} / 6\text{ hr} = 600\text{ mL/hr}

Key Concept

Calculation of initial burn fluid resuscitation using the Rule of Nines, the ATLS modified formula (2 mL/kg/%TBSA for adult thermal burns), and adjusting the rate for pre-hospital time elapsed since the injury.

Question 86Question →

A 34-year-old man is brought to the emergency department 20 minutes after a high-speed motor vehicle collision. He was the restrained driver of a vehicle that struck a concrete barrier. On arrival, the patient is confused and diaphoretic. His temperature is 36.5°C (97.7°F), blood pressure is 78/45 mm Hg, pulse is 135/min, and respirations are 24/min. Pulse oximetry shows 97% on room air. The airway is patent, and breath sounds are equal bilaterally. A focused assessment with sonography for trauma (FAST) reveals a large amount of free fluid in the hepatorenal recess (Morison pouch) and splenorenal recess. Which of the following is the most appropriate next step in management?

Immediate exploratory laparotomy

Computed tomography of the abdomen and pelvis

Continued observation with serial FAST examinations

Placement of a right-sided chest tube

Pelvic radiography

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy

Immediate exploratory laparotomy is the correct next step. This patient has sustained blunt trauma and is presenting in hemorrhagic shock (hypotension, tachycardia, altered mental status). In the Advanced Trauma Life Support (ATLS) algorithm, hemodynamically unstable patients with blunt abdominal trauma who have a positive FAST exam (indicating intra-abdominal hemorrhage) must be taken directly to the operating room for an exploratory laparotomy. The goal is to rapidly identify and control the source of bleeding (e.g., splenic or hepatic laceration) before irreversible shock or death occurs.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient has a blood pressure of 78/45 mm Hg and a heart rate of 135/min, indicating Class III or IV hemorrhagic shock (hemodynamic instability).

Hemodynamic status determines whether a trauma patient can safely undergo time-consuming imaging like a CT scan.

Evaluate the results of the primary survey and adjuncts (FAST exam).

The airway is intact, breathing is normal, but the FAST exam shows free fluid (blood) in the abdomen.

The primary survey identifies the most immediate life threats. A positive FAST in the setting of shock confirms intra-abdominal hemorrhage.

Determine the definitive next step for hemorrhage control.

The patient requires immediate transfer to the operating room.

An unstable patient with a confirmed intra-abdominal bleed must undergo an emergent exploratory laparotomy to stop the bleeding.

Key Concept

Management of blunt abdominal trauma in a hemodynamically unstable patient

Estimated Time:1m 0s

Question 87Question →

A $35$ -year-old man weighing $70 \text{ kg}$ is brought to the emergency department $2 \text{ hours}$ after being rescued from a structural fire. On examination, he is hemodynamically stable, and his airway is secure with no evidence of inhalational injury. He has sustained deep partial-thickness and full-thickness burns involving his anterior chest, anterior abdomen, entire right arm, and the anterior aspect of his left leg. The remainder of his skin is intact. Intravenous access is obtained. According to current Advanced Trauma Life Support (ATLS) guidelines for adult thermal burns, what should be the initial rate of intravenous lactated Ringer solution administration for this patient? (Enter the value in $\text{mL/hr}$ )

Show answer & explanation

Answer: 420

Answer

420

The correct initial fluid resuscitation rate is

420 \text{ mL/hr}

. According to the Advanced Trauma Life Support (ATLS) 10th edition guidelines, adult patients with thermal burns should be resuscitated using

2 \text{ mL}

of lactated Ringer solution per kilogram of body weight per percent of affected Total Body Surface Area (TBSA). First, the Rule of Nines is applied: the anterior chest (

9\%

), anterior abdomen (

9\%

), entire right arm (

9\%

), and anterior left leg (

9\%

) yield a

36\%

TBSA burn. The total 24-hour fluid requirement is

2 \text{ mL} \times 70 \text{ kg} \times 36 = 5,040 \text{ mL}

. Half of this volume (

2,520 \text{ mL}

) must be administered within the first

8 \text{ hours}

from the time of the burn. Because the patient presented

2 \text{ hours}

after the injury, the

2,520 \text{ mL}

must be infused over the remaining

6 \text{ hours}

, resulting in a rate of

2,520 \text{ mL} \div 6 \text{ hours} = 420 \text{ mL/hr}

Step-by-Step Solution

Calculate the burned Total Body Surface Area (TBSA).

36\%

Using the Rule of Nines, the anterior chest is

9\%

, anterior abdomen is

9\%

, entire right arm is

9\%

, and anterior left leg is

9\%

Calculate the total 24-hour fluid requirement using the ATLS 10th edition formula.

5,040 \text{ mL}

The current guideline for adult thermal burns is

2 \text{ mL} \times \text{weight (kg)} \times \text{TBSA (\%)}

. Therefore,

2 \times 70 \times 36 = 5,040 \text{ mL}

Determine the fluid volume required for the first 8-hour block.

2,520 \text{ mL}

Half of the total 24-hour calculated volume is given in the first

8 \text{ hours}

post-injury.

Adjust the infusion time based on the delayed presentation.

6 \text{ hours}

The 8-hour block begins at the time of injury. Since

2 \text{ hours}

have already elapsed, the

2,520 \text{ mL}

must be infused over the remaining

6 \text{ hours}

Calculate the required hourly infusion rate.

420 \text{ mL/hr}

2,520 \text{ mL}

divided by

6 \text{ hours}

equals

420 \text{ mL/hr}

Key Concept

Management of acute burn fluid resuscitation involves applying the Rule of Nines, utilizing the updated ATLS guidelines (

2 \text{ mL/kg/\%TBSA}

for adult thermal burns), and dynamically adjusting the infusion rate for the time elapsed since the injury.

Question 88Question →

Eighteen hours into resuscitation for severe thermal injuries, a $42$ -year-old male patient exhibits acute clinical deterioration in the intensive care unit. He initially presented following an industrial fire with full-thickness burns covering $55\%$ of his total body surface area, localized exclusively to his back and bilateral lower extremities. He was intubated upon arrival, and standard Parkland formula-based crystalloid infusion was initiated.

Current assessment reveals a precipitous drop in urine output to $10 \text{ mL/hr}$ . Vital signs show a temperature of $38.4^\circ\text{C}$ ( $101.1^\circ\text{F}$ ), blood pressure of $82/50 \text{ mm Hg}$ , and a heart rate of $135\text{/min}$ . The central venous pressure is elevated at $18 \text{ mm Hg}$ . The mechanical ventilator repeatedly triggers high-pressure alarms, with peak airway pressures rising acutely from $25 \text{ cm H}_2\text{O}$ to $48 \text{ cm H}_2\text{O}$ . On physical examination, the abdomen is tensely distended. Transducer measurement via the urinary catheter demonstrates an intravesical pressure of $34 \text{ mm Hg}$ . Which of the following is the most appropriate next step in management?

Decompressive laparotomy

Computed tomography of the abdomen and pelvis

Nasogastric tube insertion and continued observation

Administration of nebulized albuterol and intravenous corticosteroids

Initiation of broad-spectrum intravenous antibiotics

Show answer & explanation

Answer: Decompressive laparotomy

Answer

Decompressive laparotomy

The correct answer is decompressive laparotomy. This patient has developed secondary abdominal compartment syndrome (ACS), a known complication of the massive crystalloid resuscitation required for large surface area burns (burn shock resuscitation). The diagnosis is confirmed by an intra-abdominal pressure (measured via the bladder) greater than

20 \text{ mm Hg}

in the setting of new-onset organ failure. The upward displacement of the diaphragm causes high peak airway pressures, while compression of the inferior vena cava decreases venous return, leading to hypotension, elevated central venous pressure, and decreased renal perfusion (oliguria). The definitive, life-saving treatment for ACS with established multi-organ failure is immediate surgical decompression of the abdomen.

Step-by-Step Solution

Identify the complication of massive fluid resuscitation.

The patient has received massive crystalloid volumes for a 55% TBSA burn, leading to severe third-spacing and splanchnic edema.

Large-volume resuscitation causes capillary leak and fluid accumulation in the peritoneal and retroperitoneal spaces.

Interpret the clinical parameters.

Intravesical pressure is 34 mm Hg (normal < 5-7 mm Hg), indicating severe intra-abdominal hypertension (IAH).

Bladder pressure is the standard surrogate measurement for intra-abdominal pressure. Pressures > 20 mm Hg define abdominal compartment syndrome (ACS) if organ dysfunction is present.

Assess for organ dysfunction.

The patient has oliguria (renal), hypotension with elevated CVP (cardiovascular compression reducing venous return), and high peak airway pressures (pulmonary compression via upward diaphragmatic displacement).

The triad of IAH, respiratory compromise, and renal failure definitively establishes the diagnosis of ACS.

Determine the definitive intervention.

Decompressive laparotomy must be performed immediately.

When ACS causes refractory multi-organ failure, surgical opening of the abdominal fascia is required to release the pressure and restore organ perfusion.

Key Concept

Secondary abdominal compartment syndrome is a life-threatening complication of massive burn fluid resuscitation, diagnosed by intravesical pressures > 20 mm Hg with new organ dysfunction, and treated definitively with decompressive laparotomy.

Estimated Time:1m 30s

Question 89Question →

Emergency medical services bring a 22-year-old male to the trauma bay following an ejection from a moving vehicle. The patient is semi-conscious, with visible facial trauma and a deformed right lower extremity with surrounding ecchymosis. Arrange the following initial management steps in the correct chronological sequence according to the Advanced Trauma Life Support (ATLS) primary survey protocol.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence follows the ATLS primary survey ABCDE protocol: Airway, Breathing, Circulation, Disability, and Exposure.

The Advanced Trauma Life Support (ATLS) protocol mandates a sequential approach to trauma resuscitation known as the primary survey (ABCDE). Airway with cervical spine protection is always first, as airway obstruction causes the fastest mortality. Breathing follows to ensure gas exchange. Circulation is third to address shock and perfusion. Disability provides a baseline neurologic assessment. Finally, Exposure ensures all injuries are identified while preventing hypothermia. Skipping or rearranging these steps can lead to missed life-threatening conditions.

Step-by-Step Solution

Identify the clinical scenario

The patient is a trauma victim requiring initial evaluation and resuscitation.

Trauma resuscitations follow a standardized algorithm to prioritize the most life-threatening conditions first.

Determine the first priority (A)

Airway patency with cervical spine restriction must be evaluated first.

Loss of airway kills more rapidly than any other injury mechanism.

Determine the second priority (B)

Breathing and ventilation assessment follows airway management.

A patent airway is useless if the patient cannot adequately exchange gases.

Determine the third priority (C)

Circulation and hemorrhage control are assessed next.

Once oxygen is reaching the lungs, the cardiovascular system must be able to deliver it to tissues.

Determine the fourth priority (D)

Disability (neurologic evaluation) is performed.

A rapid assessment of neurologic status helps identify severe traumatic brain injury requiring urgent intervention.

Determine the final priority (E)

Exposure and environmental control conclude the primary survey.

Full exposure is necessary to find hidden injuries, followed by immediate warming to prevent trauma-induced hypothermia.

Key Concept

The Advanced Trauma Life Support (ATLS) primary survey follows a strict ABCDE algorithm to address the most immediately life-threatening injuries first.

Question 90Question →

An 81-year-old woman is transported to the trauma bay via ambulance after sustaining a ground-level fall, striking her left flank against a heavy wooden bench. She has a history of essential hypertension and hyperlipidemia. On initial evaluation, her temperature is 36.4°C (97.5°F), blood pressure is 82/46 mmHg, pulse is 126/min, and respiratory rate is 24/min. Her airway is patent and breath sounds are equal bilaterally. Her abdomen is distended and exhibits severe guarding over the left upper and lower quadrants. Pelvic compression does not elicit instability. She is given 1 L of warmed lactated Ringer fluid via two large-bore peripheral intravenous catheters. Reassessment shows a blood pressure of 80/44 mmHg and a pulse of 130/min. A bedside ultrasound examination demonstrates a large amount of free anechoic fluid in the hepatorenal and splenorenal spaces. Which of the following is the most appropriate next step in management?

Transfer to the operating room for celiotomy

Multidetector helical imaging of the abdomen and pelvis

Diagnostic peritoneal aspiration and lavage

Transfer to the intensive care unit for serial abdominal examinations

Endovascular angiographic embolization

Show answer & explanation

Answer: Transfer to the operating room for celiotomy

Answer

Transfer to the operating room for celiotomy is the most appropriate next step in management.

The correct next step is to transfer the patient to the operating room for a celiotomy (exploratory laparotomy). In the Advanced Trauma Life Support (ATLS) algorithm, patients presenting with blunt abdominal trauma are initially evaluated for hemodynamic stability. This patient presents with class III hemorrhagic shock (hypotension, tachycardia) and remains unstable despite an initial fluid bolus. The presence of free fluid on a focused assessment with sonography for trauma (FAST) exam in an unstable patient is highly indicative of active, life-threatening intra-abdominal hemorrhage. The definitive management is immediate surgical exploration to locate and arrest the bleeding.

Step-by-Step Solution

Assess the patient's hemodynamic status based on initial and post-resuscitation vitals.

The patient is hemodynamically unstable (hypotensive and tachycardic) and fails to respond to an initial fluid bolus of 1 L of crystalloid.

Hemodynamic stability dictates the algorithmic pathway for blunt abdominal trauma management.

Determine the source of shock based on primary survey adjuncts.

The bedside ultrasound (FAST) reveals free fluid in the abdomen, indicating intra-abdominal hemorrhage as the primary cause of her hemorrhagic shock.

Identifying the anatomical compartment of bleeding rapidly directs definitive therapy.

Select the definitive treatment modality.

The correct action is urgent surgical exploration (celiotomy).

A hemodynamically unstable patient with blunt abdominal trauma and a positive FAST requires immediate operative intervention to control hemorrhage.

Key Concept

Hemodynamically unstable patients with blunt abdominal trauma and a positive focused assessment with sonography for trauma (FAST) examination require immediate exploratory laparotomy (celiotomy).

Question 91Question →

A 32-year-old male utility worker is brought to the emergency department after sustaining a high-voltage electrical injury while repairing a power line. The incident occurred exactly 2 hours prior to his arrival. On presentation, he is awake, alert, and complains of severe pain in his extremities. His temperature is $36.8^\circ \text{C}$ ( $98.2^\circ \text{F}$ ), heart rate is $112/\text{min}$ , and blood pressure is $110/70 \text{ mm Hg}$ . Physical examination reveals deep, full-thickness burns involving his entire anterior trunk and his entire right lower extremity. There are also deep, charred entry and exit wounds on his right hand and left foot, though these cover a negligible surface area. His body weight is estimated at $75 \text{ kg}$ . A Foley catheter is inserted to monitor urine output, and large-bore intravenous access is obtained. According to the Advanced Trauma Life Support (ATLS) guidelines for high-voltage electrical injuries, what is the appropriate initial intravenous fluid infusion rate (in $\text{mL/hour}$ ) for this patient?

Show answer & explanation

Answer: 900

Answer

900

The appropriate initial fluid infusion rate is 900 mL/hour because high-voltage electrical burns require 4 mL/kg/%TBSA for fluid resuscitation, totaling 10,800 mL for this 75 kg patient with 36% TBSA burns. Half of this total (5,400 mL) must be administered in the first 8 hours post-injury. Because 2 hours have already elapsed, the 5,400 mL must be infused over the remaining 6 hours, yielding a rate of 900 mL/hour.

Step-by-Step Solution

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

TBSA = 36%

The entire anterior trunk accounts for 18% and the entire right lower extremity accounts for 18% (

18 + 18 = 36

Select the correct ATLS fluid resuscitation multiplier for the injury mechanism.

4 mL/kg/%TBSA

High-voltage electrical injuries require 4 mL/kg/%TBSA to ensure adequate diuresis and prevent acute kidney injury from rhabdomyolysis, unlike the 2 mL/kg/%TBSA used for standard thermal burns.

Calculate the total estimated fluid requirement for the first 24 hours.

10,800 mL

4 \text{ mL} \times 75 \text{ kg} \times 36\% = 10,800 \text{ mL}

Determine the fluid volume to be administered in the first 8 hours.

5,400 mL

Half of the total 24-hour calculated volume is given in the first 8 hours (

10,800 \div 2 = 5,400 \text{ mL}

Calculate the target hourly infusion rate, accounting for time elapsed since the injury.

900 mL/hour

The patient presented 2 hours post-injury, leaving 6 hours for the first 8-hour window (

8 - 2 = 6

). The rate is

5,400 \text{ mL} \div 6 \text{ hours} = 900 \text{ mL/hour}

Key Concept

High-voltage electrical burns require fluid resuscitation at 4 mL/kg/%TBSA, with half the volume administered over the first 8 hours starting from the time of injury, requiring rate adjustments for delayed presentations.

Estimated Time:2m 0s

Question 92Question →

Match each trauma patient presentation with the most appropriate definitive next step in management. Assume airway and breathing have been secured in all patients.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Unstable patient with negative FAST and pelvic fracture -> Pelvic angiography. Unstable patient with positive FAST (intraabdominal) -> Exploratory laparotomy. Stable patient with positive FAST -> CT scan. Unstable patient with positive FAST (pericardial) -> Median sternotomy or thoracotomy.

The correct matches strictly adhere to ATLS protocols. Hemodynamic instability with intraabdominal fluid requires laparotomy, whereas instability with pericardial fluid requires sternotomy/thoracotomy. Stable patients can safely undergo CT imaging. Unstable patients with pelvic fractures and negative FAST scans require angiography to manage retroperitoneal arterial bleeding.

Step-by-Step Solution

Assess the patient's hemodynamic status.

Identify whether the patient is hemodynamically stable or unstable, as this dictates the urgency and type of the next intervention.

Hemodynamically unstable patients cannot tolerate the delays or the physical environment of the CT scanner and require immediate bedside or operative intervention.

Interpret the Focused Assessment with Sonography for Trauma (FAST) results in the context of stability.

A positive FAST in an unstable patient mandates immediate surgery (laparotomy for abdominal fluid, sternotomy/thoracotomy for pericardial fluid).

FAST rapidly identifies life-threatening hemorrhage or tamponade that is actively causing shock.

Evaluate the management of pelvic fractures with concurrent shock.

Recognize that a negative FAST in an unstable patient with a pelvic fracture strongly suggests retroperitoneal bleeding, which is not addressable via laparotomy.

Laparotomy releases the retroperitoneal tamponade effect, potentially worsening hemorrhage. These patients need mechanical stabilization followed by angiography.

Key Concept

Advanced Trauma Life Support (ATLS) diagnostic and therapeutic algorithms based on hemodynamic stability, mechanism of injury, and FAST scan findings.

Estimated Time:2m 0s

Question 93Question →

A 35-year-old man is brought to the emergency department after a motor vehicle collision. On initial evaluation, he opens his eyes only when the physician loudly calls his name. When asked what happened, he responds with single, random words that do not form coherent sentences. When pressure is applied to his right fingernail bed, he briskly flexes his elbow to pull his right arm away from the stimulus, but does not reach toward the examiner's hand. What is this patient's Glasgow Coma Scale (GCS) score?

Show answer & explanation

Answer: 10

Answer

The Glasgow Coma Scale (GCS) evaluates a patient's level of consciousness based on three categories: Eye Opening (E), Verbal Response (V), and Best Motor Response (M). This patient opens his eyes to sound (E3), uses inappropriate words rather than conversational sentences (V3), and withdraws from pain without localizing it (M4). The total score is calculated by adding these components: E3 + V3 + M4 = 10 points. Calculating an accurate GCS score is a critical initial step in the primary survey of any trauma patient to determine the severity of traumatic brain injury and the potential need for definitive airway management.

Step-by-Step Solution

Evaluate Eye Opening (E)

3 points

The patient opens his eyes in response to a verbal stimulus (his name being called).

Evaluate Verbal Response (V)

3 points

The patient speaks single, random words but does not engage in a conversation.

Evaluate Motor Response (M)

4 points

The patient exhibits normal flexion and withdrawal from a painful stimulus without purposefully localizing the source of pain.

Calculate the total score

10 points

The total Glasgow Coma Scale (GCS) score is the sum of the Eye, Verbal, and Motor components (3 + 3 + 4).

Key Concept

Glasgow Coma Scale (GCS) Scoring

Estimated Time:45s

Question 94Question →

Match each classic thoracic trauma clinical presentation with its most appropriate definitive diagnostic modality or immediate intervention.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Tension pneumothorax matches with immediate needle/finger thoracostomy. Tracheobronchial injury matches with bronchoscopy. Blunt aortic injury matches with CTA of the chest. Cardiac tamponade matches with bedside echocardiography.

Each presentation represents a classic thoracic trauma scenario. Tension pneumothorax is diagnosed clinically and treated immediately with decompression. Tracheobronchial injuries require bronchoscopy for visualization of the airway tear. Suspected blunt aortic injury requires CTA for definitive diagnosis. Cardiac tamponade is rapidly confirmed with bedside ultrasound.

Step-by-Step Solution

Analyze the first presentation (severe respiratory distress, absent breath sounds, tracheal deviation).

Identify this as a tension pneumothorax.

Recognizing it as a clinical diagnosis means intervention (thoracostomy) must precede any imaging.

Analyze the second presentation (continuous air leak, failure of lung re-expansion).

Identify this as a tracheobronchial injury.

To select bronchoscopy as the definitive diagnostic and therapeutic planning study.

Analyze the third presentation (widened mediastinum after deceleration injury).

Identify the high risk for blunt thoracic aortic injury.

To select CTA of the chest as the gold standard diagnostic test.

Analyze the fourth presentation (hypotension, JVD, muffled heart sounds after penetrating trauma).

Identify Beck's triad for cardiac tamponade.

To select bedside echocardiography (FAST) to rapidly confirm pericardial effusion prior to definitive surgical management.

Key Concept

Diagnosis and acute management of life-threatening thoracic trauma (tension pneumothorax, tracheobronchial injury, blunt aortic injury, cardiac tamponade).

Question 95Question →

A 42-year-old male is transported to the emergency department via helicopter after a high-speed motorcycle collision. Upon arrival, his airway is patent, and breath sounds are vesicular and equal bilaterally. His blood pressure is 75/40 mmHg, and his heart rate is 132/min. The abdomen is soft, non-distended, and without rebound tenderness. Examination of the lower half of the body reveals a shortened and externally rotated right lower extremity, as well as significant ecchymosis over the scrotum and perineum. Gentle palpation of the iliac crests reveals abnormal mobility. A focused assessment with sonography for trauma (FAST) examination demonstrates no free intraperitoneal or pericardial fluid. Intravenous access is established, and administration of uncrossmatched blood is initiated. Which of the following is the most appropriate next step in management?

Application of a noninvasive pelvic binder

Computed tomography of the abdomen and pelvis

Immediate exploratory laparotomy

Pelvic angiography with embolization

Retrograde urethrography

Show answer & explanation

Answer: Application of a noninvasive pelvic binder

Answer

Application of a noninvasive pelvic binder

The correct answer is application of a noninvasive pelvic binder. This patient presents with profound hemorrhagic shock (hypotension, marked tachycardia) and physical exam findings highly concerning for an open-book pelvic ring disruption (scrotal/perineal ecchymosis, abnormal mobility of iliac crests). In patients with severe pelvic trauma, the primary source of life-threatening hemorrhage is often the presacral venous plexus or branches of the internal iliac artery. Because the FAST exam is negative, the bleeding is retroperitoneal rather than intraperitoneal. Therefore, the immediate next step in management is mechanical stabilization of the pelvis using a commercial pelvic binder (or a sheet wrapped around the greater trochanters). This critical maneuver reduces pelvic volume, promotes a tamponade effect on venous bleeding, and stabilizes the fracture ends to prevent further hemorrhage.

Step-by-Step Solution

Identify the primary physiologic derangement.

The patient is in class III/IV hemorrhagic shock (BP 75/40 mmHg, HR 132/min).

Recognizing shock determines the immediate need for aggressive resuscitation and source control over non-emergent diagnostics.

Localize the source of life-threatening hemorrhage.

The bleeding is retroperitoneal, originating from an unstable pelvic fracture (abnormal iliac mobility, perineal ecchymosis, negative FAST).

A negative FAST in the setting of shock and an unstable pelvis points to the presacral venous plexus or internal iliac arteries as the source.

Select the immediate intervention for source control.

Application of a pelvic binder.

Mechanical stabilization decreases pelvic volume and creates a tamponade effect to control retroperitoneal venous hemorrhage while preparing for potential definitive procedures.

Key Concept

In a hemodynamically unstable patient with an open-book pelvic fracture and a negative FAST exam, the most appropriate immediate next step after fluid/blood resuscitation is mechanical stabilization with a pelvic binder to tamponade retroperitoneal bleeding.

Question 96Question →

A 22-year-old male is brought to the emergency department via ambulance after being struck by a motor vehicle while riding his bicycle. He was reportedly thrown over the handlebars. On arrival, he is confused and diaphoretic. His temperature is $36.5^\circ\text{C}$ ( $97.7^\circ\text{F}$ ), blood pressure is $78/40\text{ mmHg}$ , pulse is $135\text{/min}$ , and respirations are $24\text{/min}$ . Oxygen saturation is $97\%$ on room air. The airway is clear, and breath sounds are equal bilaterally. Primary survey reveals marked abdominal distension with diffuse guarding and rebound tenderness. A focused assessment with sonography for trauma (FAST) demonstrates a large amount of free fluid in the hepatorenal recess (Morison's pouch). Intravenous fluid resuscitation is initiated with $1\text{ L}$ of warmed crystalloid, but his repeat blood pressure is $80/42\text{ mmHg}$ . Which of the following is the most appropriate next step in management?

Immediate exploratory laparotomy

Computed tomography of the abdomen and pelvis

Diagnostic peritoneal lavage (DPL)

Continued observation and serial abdominal examinations

Pelvic radiography

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

The correct management is immediate exploratory laparotomy.

The patient presents with blunt abdominal trauma, hemorrhagic shock that is unresponsive to initial fluid resuscitation, and a positive FAST scan showing intraperitoneal fluid. According to Advanced Trauma Life Support (ATLS) protocols, a hemodynamically unstable patient with a positive FAST has a definitive indication for immediate exploratory laparotomy to control the bleeding.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient is in hemorrhagic shock, evidenced by hypotension (

78/40\text{ mmHg}

), tachycardia (

135\text{/min}

), and unresponsiveness to initial fluid resuscitation.

Hemodynamic stability dictates the diagnostic and therapeutic algorithm in trauma.

Evaluate the mechanism of injury and primary survey findings.

Blunt abdominal trauma with signs of peritonitis and a positive FAST scan indicating free intraperitoneal fluid.

Identifies the abdomen as the likely source of the life-threatening hemorrhage.

Determine the definitive next step for a hemodynamically unstable patient with blunt abdominal trauma and a positive FAST.

Proceed directly to the operating room for an exploratory laparotomy.

Hemodynamically unstable patients with confirmed intra-abdominal bleeding cannot safely undergo cross-sectional imaging (CT) and require immediate surgical control of hemorrhage.

Key Concept

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

Question 97Question →

Lower extremity injuries frequently involve concurrent vascular, neurologic, or systemic complications that require distinct, time-sensitive interventions. Match each specific lower extremity trauma presentation with its most appropriate next step in management or definitive intervention.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The presentation with an ABI of

0.875

pairs with CTA; the presentation with hard vascular signs pairs with immediate surgical exploration; the presentation with crescendo stretch pain pairs with cast bivalving and fasciotomy; and the presentation with a petechial rash and hypoxia pairs with supportive care.

Each lower extremity trauma presentation describes a distinct clinical syndrome with a highly specific, protocol-driven next step in management based on Advanced Trauma Life Support (ATLS) and surgical principles.

Step-by-Step Solution

Calculate the ankle-brachial index (ABI) for the patient with a palpable pulse.

The ABI is

\frac{105}{120} = 0.875

An ABI

< 0.9

establishes the presence of a soft sign of vascular injury, meaning the patient requires further vascular imaging (CTA) rather than immediate surgery.

Identify the clinical significance of an absent pulse and expanding hematoma in a traumatized limb.

These are definitively recognized as hard signs of vascular injury.

Hard signs of vascular injury mandate immediate operative intervention to restore perfusion and save the limb.

Analyze the localized anatomic symptoms of crescendo pain and severe pain on passive plantar flexion in a casted limb.

These symptoms localize to acute compartment syndrome of the anterior lower leg.

Passive plantar flexion stretches the anterior compartment. The immediate treatment must relieve external pressure by bivalving the cast, proceeding to fasciotomy if unresolved.

Correlate the systemic triad of tachypnea, altered mental status, and petechial rash following a femur fracture.

This constellation is diagnostic of fat embolism syndrome.

Fat embolism is a systemic inflammatory and obstructive complication requiring supportive mechanical ventilation and monitoring rather than surgical intervention.

Key Concept

Triage and definitive management of limb-threatening and systemic complications following severe lower extremity orthopedic trauma.

Question 98Question →

A 35-year-old man is brought to the emergency department after being rescued from a closed-space house fire. On arrival, he is agitated and in respiratory distress. His vital signs are temperature 37.0°C (98.6°F), blood pressure 110/70 mmHg, heart rate 115/min, and respiratory rate 26/min. Physical examination reveals full-thickness burns involving his anterior trunk and both upper extremities. He has soot in his oropharynx, singed nasal vibrissae, and a hoarse voice. Arrange the following steps in the most appropriate chronological order for the acute management of this patient.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence is endotracheal intubation, followed by establishing intravenous access, initiating fluid resuscitation, inserting a Foley catheter, and finally performing local wound care.

The sequence of interventions in trauma and severe burn patients strictly follows the Advanced Trauma Life Support (ATLS) protocol: Airway, Breathing, Circulation, Disability, and Exposure (ABCDE). This patient presents with clinical signs of inhalation injury (hoarseness, singed vibrissae, soot), which carries a high risk of rapid, irreversible airway edema. Therefore, early endotracheal intubation (Airway) is the first and most critical step. Once the airway is protected, focus shifts to Circulation. Severe burns cause massive capillary leak and hypovolemia, requiring establishing large-bore IV access followed immediately by crystalloid resuscitation (e.g., Parkland formula). To evaluate the adequacy of this resuscitation, a Foley catheter is inserted to measure hourly urine output. Finally, once life-threatening systemic issues are managed, attention turns to Exposure/Environment, which includes debridement and application of topical antimicrobials to the burn wounds.

Step-by-Step Solution

Assess the airway for impending obstruction.

Endotracheal intubation is selected as the first step.

Hoarseness, singed vibrissae, soot, and a closed-space fire indicate inhalation injury. Early intubation is required before progressive edema makes the airway completely inaccessible.

Address circulation by obtaining vascular access.

Large-bore IV access is established.

With the airway secured, the next ATLS priority is Circulation, which requires robust venous access for fluid administration.

Initiate calculated fluid resuscitation.

Lactated Ringer's infusion is started.

Extensive burns lead to massive fluid shifts and hypovolemic shock. Immediate crystalloid resuscitation is necessary to maintain end-organ perfusion.

Establish a method to monitor resuscitation efficacy.

A Foley catheter is inserted.

Urine output must be monitored closely to titrate the IV fluid rate up or down, ensuring adequate tissue perfusion without causing fluid overload.

Address the burn wounds.

Topical antimicrobials and dressings are applied.

Local wound care prevents infection and fluid loss but is a secondary priority compared to stabilizing the patient's airway and hemodynamics.

Key Concept

Acute burn management follows the ATLS ABCDE algorithm, requiring early intubation for inhalation injury before progressing to fluid resuscitation and lastly wound care.

Question 99Question →

A 35-year-old male is brought to the emergency department after a high-speed motorcycle collision. He complains of severe lower abdominal and pelvic pain.

Vital signs on arrival are:
Temperature: $36.5^\circ\text{C}$ ( $97.7^\circ\text{F}$ )
Blood pressure: $76/40\text{ mmHg}$
Heart rate: $135/\text{min}$
Respiratory rate: $24/\text{min}$
Oxygen saturation: $96\%$ on room air

The primary survey reveals a clear airway and bilaterally equal breath sounds. The abdomen is soft and non-distended without guarding or rebound tenderness. Emergency medical services placed a commercial pelvic binder prior to arrival. A portable anteroposterior pelvic radiograph reveals an "open-book" pelvic fracture with a $4\text{ cm}$ diastasis of the pubic symphysis.

A FAST (Focused Assessment with Sonography for Trauma) examination demonstrates no free fluid in the pericardial, perisplenic, perihepatic, or pelvic views.

Two large-bore intravenous lines are established, and he receives $1\text{ L}$ of warmed lactated Ringer solution and $1\text{ unit}$ of uncrossmatched type O-negative blood. A repeat blood pressure is $82/45\text{ mmHg}$ with a heart rate of $128/\text{min}$ .

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

Computed tomography of the abdomen and pelvis

Exploratory laparotomy

Pelvic angiography

Diagnostic peritoneal lavage

Retrograde cystourethrography

Show answer & explanation

Answer: Pelvic angiography

Answer

Pelvic angiography

This patient is in hemorrhagic shock following blunt trauma, with an 'open-book' pelvic fracture. The initial management for a hemodynamically unstable patient with a mechanically unstable pelvic fracture is the application of a pelvic binder to reduce pelvic volume and promote tamponade of venous bleeding. Despite the binder and initial fluid and blood resuscitation, the patient remains hypotensive. The FAST exam is negative, which essentially rules out massive intra-abdominal hemorrhage as the primary cause of shock. Therefore, the ongoing hemorrhage is originating from the retroperitoneal pelvic venous plexus or pelvic arterial branches. The most appropriate next step in management for a hemodynamically unstable patient with a pelvic fracture and a negative FAST is pelvic angiography with embolization (or preperitoneal pelvic packing) to definitively control the retroperitoneal hemorrhage.

Step-by-Step Solution

Assess hemodynamic status and primary survey findings.

The patient is in persistent hemorrhagic shock (hypotension, tachycardia) following blunt trauma despite initial fluid and blood resuscitation.

Determines the urgency of intervention and categorizes the patient into the unstable trauma treatment algorithm.

Evaluate the results of the FAST examination in the context of known injuries.

The FAST is negative, effectively ruling out massive intraperitoneal or pericardial hemorrhage as the cause of shock.

Differentiates between intra-abdominal bleeding (which would require laparotomy) and retroperitoneal bleeding (which requires angiography or packing).

Identify the remaining source of hemorrhage and select the definitive intervention.

With a negative FAST and an unstable pelvic fracture despite a previously applied binder, the bleeding is retroperitoneal. Pelvic angiography is selected.

Angiography allows for the rapid identification and embolization of actively bleeding pelvic arterial branches, achieving definitive hemorrhage control.

Key Concept

In hemodynamically unstable patients with pelvic fractures and a negative FAST exam, the source of bleeding is retroperitoneal; the appropriate next step is pelvic angiography with embolization or preperitoneal pelvic packing.

Estimated Time:1m 30s

Question 100Question →

Pair the following clinical presentations of acute trauma patients with the corresponding immediate management step.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Cardiac tamponade requires pericardial drainage; tension pneumothorax requires needle or tube decompression; massive hemothorax requires a large-bore chest tube; and an unstable pelvic fracture without intraperitoneal fluid requires mechanical pelvic binding.

According to standardized trauma management algorithms, immediate life threats identified on the primary survey require rapid procedural intervention. Beck's triad indicates cardiac tamponade requiring drainage. Hyperresonance with absent breath sounds and shock indicates a tension pneumothorax requiring decompression. Dullness with absent breath sounds and shock indicates a massive hemothorax requiring tube thoracostomy. Finally, a disruptive pelvic fracture with a negative FAST indicates retroperitoneal bleeding, requiring a reduction in pelvic volume via a binder to promote tamponade.

Step-by-Step Solution

Analyze the physical examination findings for each patient to identify the specific life-threatening injury.

Identified cardiac tamponade, tension pneumothorax, massive hemothorax, and retroperitoneal bleeding from a pelvic fracture.

Accurate identification of the underlying pathology during the primary survey is required to direct appropriate intervention.

Match the identified pathology with the initial life-saving procedure dictated by trauma protocols.

Paired each presentation with its respective targeted intervention.

Immediate life threats must be treated instantaneously as they are recognized, prior to obtaining further imaging.

Key Concept

Advanced Trauma Life Support (ATLS) Primary Survey Interventions

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