Trauma and Burns

283 questions

All types283 Multiple choice148 Numeric38 Matching52 Ordering45

A $28$ -year-old male is brought to the trauma bay after a high-speed motorcycle collision. Emergency medical services report a prolonged scene time. On arrival, the patient is unresponsive. There is active, pulsatile bleeding from a traumatic partial amputation of the left lower leg. He has severe maxillofacial smash injuries with pooling of blood and vomitus in the oropharynx. Breath sounds are absent on the right side, and the trachea is deviated to the left. His blood pressure is $70/40$ mm Hg, and his heart rate is $145$ /min. Arrange the following initial management steps in the correct chronological sequence according to the current Advanced Trauma Life Support (ATLS) primary survey protocol.

Drag items to arrange them in the correct order

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Answer

The correct sequence is: Control catastrophic hemorrhage (tourniquet), secure the airway (intubation), manage breathing (chest decompression), restore circulation (massive transfusion), and assess disability (Glasgow Coma Scale).

The correct chronological sequence aligns with the current ATLS primary survey algorithm: <C>ABCDE. Catastrophic external hemorrhage (pulsatile amputation) is managed first with a tourniquet. Next, Airway (maxillofacial trauma with gurgling) is secured via intubation with c-spine control. Breathing (tension pneumothorax) is then addressed via decompression. Circulation (hemorrhagic shock) is subsequently resuscitated with blood products. Finally, Disability (GCS) is assessed once physiological stability is maximized.

Step-by-Step Solution

Identify the most immediate threat to life: catastrophic external hemorrhage.

Applying a proximal tourniquet to the left lower extremity is prioritized.

The current edition of ATLS emphasizes the <C>ABCDE sequence, placing massive external bleeding (<C>) before airway management.

Assess and secure the airway.

Endotracheal intubation with cervical spine stabilization is performed.

Once catastrophic bleeding is halted, a definitive airway must be established due to the maxillofacial smash injury, pooled blood, and GCS < 8.

Assess breathing and treat tension pneumothorax.

Needle decompression or tube thoracostomy is performed on the right chest.

Absent breath sounds and tracheal deviation indicate a tension pneumothorax (Breathing component) that must be relieved to allow ventilation through the secured airway.

Address systemic circulation and hemorrhagic shock.

Massive transfusion protocol is initiated via large-bore IV access.

With the airway secured and chest decompressed, broader circulatory resuscitation (Circulation component) focuses on replacing lost intravascular volume.

Perform a baseline neurological evaluation.

Glasgow Coma Scale score and pupillary response are documented.

The Disability component is evaluated accurately only after reversing hypoxia and hypotension, as these metabolic derangements confound the neurological exam.

Key Concept

The modern ATLS primary survey follows the <C>ABCDE algorithm, prioritizing Catastrophic external hemorrhage over Airway, Breathing, Circulation, Disability, and Exposure.

Question 142Question →

A 29-year-old woman, primigravida at 34 weeks gestation, is brought to the emergency department after a high-speed motor vehicle collision. She was the unrestrained driver. Upon arrival, her blood pressure is 78/42 mm Hg, pulse is 138/min, and respirations are 26/min. The airway is patent, and the trachea is midline. Breath sounds are vesicular and equal bilaterally. The patient is lethargic and pale. Abdominal examination reveals a gravid uterus, diffuse abdominal rigidity, and severe rebound tenderness. A Focused Assessment with Sonography for Trauma (FAST) exam reveals a large anechoic stripe in the hepatorenal space. After the rapid administration of 2 liters of intravenous crystalloid, her blood pressure is 82/46 mm Hg. Fetal heart rate monitoring shows a baseline of 105/min with recurrent late decelerations. The patient's husband, who was a restrained passenger and sustained no significant injuries, frantically demands that the surgical team perform an emergency Cesarean delivery immediately to save the baby. Which of the following is the most appropriate next step in management?

Immediate exploratory laparotomy

Computed tomography of the abdomen and pelvis

Emergency Cesarean delivery prior to maternal abdominal exploration

Continued conservative resuscitation with intravenous fluids and blood products

Observation, as her hemodynamic parameters reflect normal third-trimester physiologic changes

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Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy

The correct answer is immediate exploratory laparotomy. This patient has sustained high-impact blunt abdominal trauma resulting in severe hemorrhagic shock (hypotension, tachycardia) and peritonitis. The positive FAST exam localizes the bleeding to the peritoneal cavity. According to ATLS protocols, any hemodynamically unstable patient with a positive FAST exam requires immediate exploratory laparotomy. In the setting of pregnancy, the fundamental principle of trauma management is that the best way to resuscitate the fetus is to aggressively resuscitate the mother. Therefore, maternal hemorrhage control takes absolute priority over obstetric interventions. While a Cesarean delivery might be performed concurrently if the gravid uterus severely impedes surgical exposure, the primary indicated procedure is the laparotomy to find and stop the bleeding.

Step-by-Step Solution

Analyze the patient's vital signs and primary survey findings.

The patient has severe hypotension (78/42 mm Hg) and tachycardia (138/min) that are unresponsive to initial fluid resuscitation, indicating class III/IV hemorrhagic shock.

Identifying the severity of shock determines the urgency of surgical intervention.

Interpret the FAST exam in the context of the physical exam.

A large anechoic stripe in the hepatorenal space (Morison's pouch) combined with a rigid abdomen confirms a massive intra-abdominal hemorrhage as the source of shock.

A positive FAST in a hemodynamically unstable trauma patient mandates immediate surgical exploration.

Evaluate the obstetric and ethical constraints (fetal distress and husband's demands).

The fetus is in distress due to maternal hypovolemia. The most effective way to optimize fetal outcomes is to resuscitate the mother. Maternal survival supersedes fetal considerations when triaging life-saving interventions.

Performing a primary Cesarean section delays maternal hemorrhage control, threatening the lives of both the mother and the fetus.

Select the definitive next step.

Immediate exploratory laparotomy must be performed to control the intra-abdominal bleeding.

This is the standard of care for hemodynamically unstable blunt abdominal trauma with a positive FAST.

Key Concept

Maternal stabilization via exploratory laparotomy takes absolute precedence in pregnant trauma patients with unremitting hemorrhagic shock.

Estimated Time:1m 30s

Question 143Question →

A $45$ -year-old man is brought to the emergency department by ambulance following an industrial boiler explosion. The injury occurred exactly $2$ hours prior to his arrival. He sustained deep partial-thickness and full-thickness thermal burns to his entire anterior trunk and his entire left lower extremity. His airway is intact without signs of inhalation injury, and there is no evidence of electrical injury. The patient weighs $80\text{ kg}$ ( $176\text{ lbs}$ ). No intravenous fluids were administered in the prehospital setting. According to current Advanced Trauma Life Support (ATLS) guidelines for adult thermal burns, the medical team initiates resuscitation with lactated Ringer solution. What is the appropriate initial rate of intravenous fluid administration in $\text{mL/hr}$ for this patient?

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Answer: 480

Answer

480

The correct infusion rate is

480\text{ mL/hr}

. Using the Rule of Nines, the patient has

36\%\text{ TBSA}

burned (anterior trunk

18\%

, left leg

18\%

). According to current ATLS guidelines for adult thermal burns, the total

24

-hour fluid requirement is

2\text{ mL} \times 80\text{ kg} \times 36 = 5760\text{ mL}

. Half of this volume (

2880\text{ mL}

) must be given in the first

8

hours from the time of injury. Because the injury occurred

2

hours prior to arrival, there are

6

hours remaining in this window. Therefore, the rate is

2880\text{ mL} \div 6\text{ hours} = 480\text{ mL/hr}

Step-by-Step Solution

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

18\%

(anterior trunk) +

18\%

(entire left lower extremity) =

36\%\text{ TBSA}

Accurate estimation of the burn size is required for standard resuscitation formulas.

Calculate the total

24

-hour fluid requirement using the current ATLS thermal burn formula.

2\text{ mL} \times 80\text{ kg} \times 36\% = 5760\text{ mL}

Current ATLS guidelines recommend

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

for adults with thermal burns to prevent over-resuscitation and complications like abdominal compartment syndrome.

Determine the fluid volume to be administered in the first

8

hours.

5760\text{ mL} \div 2 = 2880\text{ mL}

Half of the total calculated

24

-hour fluid volume must be administered in the first

8

hours post-injury.

Calculate the hourly infusion rate adjusted for the delayed presentation.

2880\text{ mL} \div 6\text{ hours} = 480\text{ mL/hr}

The

8

-hour window begins at the time of injury, not arrival. Since

2

hours have elapsed, the

2880\text{ mL}

must be infused over the remaining

6

hours.

Key Concept

Calculation of initial fluid resuscitation rate in adult thermal burns incorporating updated ATLS formulas and adjustment for prehospital time delays.

Question 144Question →

Match each clinical trauma scenario with the most appropriate definitive diagnostic or therapeutic next step.

Click a left item, then click its matching right item

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Answer

The correct pairings align the clinical signs with their ATLS-directed management: occult diaphragmatic injury risk warrants diagnostic laparoscopy, suspected tracheobronchial tears require bronchoscopy, unstable pelvic fractures with negative FAST need pelvic angiography, soft signs of vascular injury mandate CT angiography, and hard signs of vascular injury necessitate immediate surgical exploration.

Optimal trauma management depends on integrating the mechanism of injury, hemodynamic status, and physical exam findings. The selected interventions correctly differentiate between the need for immediate operative control (hard signs of vascular injury), imaging to localize occult injuries (soft vascular signs, diaphragmatic evaluation), and specific endovascular or endoscopic modalities (pelvic bleeding, tracheobronchial tears) according to ATLS protocols.

Step-by-Step Solution

Analyze the mechanism of injury and anatomical zone for each patient.

Identified specific injury risks (e.g., thoracoabdominal zone risk for diaphragmatic laceration, knee dislocation risk for popliteal artery injury).

Trauma management is highly dependent on the predictable injury patterns associated with specific mechanisms.

Evaluate hemodynamic status and specific physical exam findings.

Differentiated between stable patients needing diagnostic imaging (CT angio, laparoscopy) and unstable/hard-sign patients needing immediate intervention (surgery, pelvic angio).

Hemodynamic instability or the presence of hard signs supersedes the need for diagnostic imaging.

Apply ATLS algorithms to determine the definitive next step.

Matched each presentation to the single best diagnostic or therapeutic modality.

Standardized trauma protocols dictate these specific steps to minimize mortality and morbidity.

Key Concept

Advanced Trauma Life Support (ATLS) algorithms for definitive diagnosis and management based on mechanism, hemodynamic stability, and physical exam findings.

Question 145Question →

A 54-year-old female pedestrian is transported to the trauma bay after being struck by a public transit bus. Upon arrival, she is lethargic and pale. Her blood pressure is 75/40 mmHg, heart rate is 138/min, and respiratory rate is 26/min. The airway is patent, and breath sounds are equal bilaterally. Physical examination reveals extensive ecchymoses over the lower abdomen and flanks. There is a palpable diastasis of the pubic symphysis, and the pelvis is mechanically unstable to anteroposterior compression. An initial point-of-care ultrasound of the chest and abdomen shows no evidence of pericardial, pleural, or intraperitoneal fluid. An anteroposterior pelvic radiograph confirms a severely displaced open-book pelvic fracture. A circumferential non-invasive pelvic binder is promptly placed over the greater trochanters. Following the administration of two units of uncrossmatched type O-negative packed red blood cells, her blood pressure remains 78/42 mmHg and heart rate is 135/min. Which of the following is the most appropriate next step in the management of this patient?

Fluoroscopic percutaneous arterial embolization

Contrast-enhanced cross-sectional imaging of the torso

Surgical exploration of the peritoneal cavity

Placement of a pelvic external orthopedic fixator

Percutaneous aspiration of the peritoneal space

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Answer: Fluoroscopic percutaneous arterial embolization

Answer

The correct answer is fluoroscopic percutaneous arterial embolization (or preperitoneal pelvic packing).

The correct answer is fluoroscopic percutaneous arterial embolization. This patient is experiencing hemorrhagic shock secondary to a severe pelvic ring disruption. In the setting of an unstable pelvic fracture, initial management dictates mechanical stabilization with a non-invasive pelvic binder to reduce pelvic volume and tamponade venous bleeding. If the patient remains hemodynamically unstable despite binding and initial blood product resuscitation, and intraperitoneal hemorrhage has been ruled out (via a negative point-of-care ultrasound), the most likely source of ongoing blood loss is arterial (e.g., branches of the internal iliac artery). The appropriate next intervention is pelvic angiography with embolization (or preperitoneal pelvic packing, depending on institutional protocol and resources). Proceeding to this step provides definitive hemorrhage control for bleeding that is refractory to mechanical compression.

Step-by-Step Solution

Assess the primary survey and hemodynamic status.

The patient is in class III/IV hemorrhagic shock.

Vital signs demonstrate severe hypotension and tachycardia following high-energy blunt trauma.

Identify the source of hemorrhage.

Point-of-care ultrasound is negative for intracavitary bleeding; however, clinical and radiographic findings confirm a mechanically unstable pelvic fracture.

In blunt trauma, major blood loss typically occurs in the chest, abdomen, pelvis, or long bones. A negative ultrasound effectively points to the retroperitoneal pelvis as the source.

Institute initial hemorrhage control.

A non-invasive pelvic binder is applied to reduce pelvic volume and promote tamponade.

The majority of pelvic hemorrhage is venous and responds well to mechanical volume reduction.

Determine the subsequent step for refractory shock.

Arterial embolization (or preperitoneal packing) is indicated.

Persistent instability after pelvic binding and initial blood product resuscitation suggests ongoing arterial hemorrhage, which requires targeted definitive control.

Key Concept

Management of hemodynamically unstable pelvic fractures

Question 146Question →

A 37-year-old male is brought to the emergency department by ambulance after falling approximately 20 feet (6 meters) from scaffolding. He is immobilized on a backboard with a cervical collar. Upon arrival, his temperature is $36.1^{\circ}\text{C}$ ( $97.0^{\circ}\text{F}$ ), blood pressure is $78/45\text{ mmHg}$ , heart rate is $138\text{ /min}$ , and respiratory rate is $26\text{ /min}$ . Oxygen saturation is $97\%$ on room air. Two large-bore intravenous lines are established, and aggressive crystalloid fluid resuscitation is initiated. The airway is patent, and breath sounds are present and equal bilaterally. The abdomen is distended and diffusely tender. The pelvis is stable to anteroposterior compression. Focused assessment with sonography for trauma (FAST) reveals a significant anechoic fluid collection in the splenorenal recess. His blood pressure remains $80/48\text{ mmHg}$ after $1\text{ L}$ of crystalloid infusion. Which of the following is the most appropriate next step in management?

Exploratory laparotomy

Computed tomography of the abdomen and pelvis

Diagnostic peritoneal lavage

Pelvic angiography with embolization

Administration of intravenous norepinephrine

Show answer & explanation

Answer: Exploratory laparotomy

Answer

Exploratory laparotomy

The correct next step is immediate exploratory laparotomy. According to advanced trauma life support (ATLS) protocols, a patient presenting with blunt abdominal trauma who exhibits hemodynamic instability (e.g., persistent hypotension and tachycardia despite initial crystalloid resuscitation) must undergo rapid evaluation for the source of bleeding. A positive Focused Assessment with Sonography for Trauma (FAST) scan confirms the presence of intraperitoneal hemorrhage. In the setting of shock and a positive FAST, the patient is actively bleeding into the abdominal cavity and requires immediate surgical exploration (laparotomy) to achieve source control. Any delay for further diagnostic testing significantly increases mortality.

Step-by-Step Solution

Evaluate the patient's hemodynamic status and response to initial resuscitation.

The patient presents in hypovolemic shock (hypotension, tachycardia) and remains unstable after an initial 1 L crystalloid bolus.

Hemodynamic status dictates the diagnostic and therapeutic algorithm in blunt trauma.

Analyze the primary survey and bedside imaging findings.

Airway and breathing are intact. The FAST scan is positive, demonstrating anechoic fluid (blood) in the splenorenal recess.

A positive FAST localizes the source of hemorrhagic shock to the peritoneal cavity.

Determine the definitive treatment based on the ATLS algorithm for blunt abdominal trauma.

Immediate exploratory laparotomy is required.

The combination of hemodynamic instability and a positive FAST scan indicates life-threatening intra-abdominal hemorrhage requiring emergent surgical source control.

Key Concept

In patients with blunt abdominal trauma, the combination of hemodynamic instability and a positive FAST scan is an absolute indication for immediate exploratory laparotomy.

Question 147Question →

Match the following clinical presentations of trauma patients to the most appropriate next step in management. Assume airway and breathing have been assessed and secured in all patients.

Click a left item, then click its matching right item

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Answer

Unstable + positive FAST matches to exploratory laparotomy. Unstable + pelvic fracture + negative FAST matches to pelvic binder and angiography. Stable + positive FAST matches to CT of the abdomen and pelvis. Stable + widened mediastinum matches to CT angiography of the chest.

Appropriate trauma management relies on the Advanced Trauma Life Support (ATLS) algorithms. The algorithm branches sharply based on hemodynamic stability. Unstable patients with intra-abdominal bleeding (positive FAST) must go to the operating room for an exploratory laparotomy. Unstable patients with severe pelvic fractures and a negative FAST usually bleed into the retroperitoneum, which is managed mechanically (pelvic binder) and endovascularly (angiography). Conversely, stable patients, even with abnormal preliminary findings (positive FAST or widened mediastinum), can and should undergo definitive cross-sectional imaging (CT scan) to properly grade the injury and avoid unnecessary surgery.

Step-by-Step Solution

Assess the hemodynamic status of each patient.

Patients 1 and 2 are in hypovolemic shock (unstable). Patients 3 and 4 have normal blood pressure and heart rate (stable).

Hemodynamic stability dictates whether a patient can safely travel to the CT scanner or requires immediate bedside/operating room intervention.

Evaluate the primary survey findings for the unstable patients.

Patient 1 has a positive FAST (intraperitoneal bleeding) requiring exploratory laparotomy. Patient 2 has a negative FAST but a severe pelvic fracture (retroperitoneal bleeding) requiring a pelvic binder and angiography.

The source of bleeding must be identified rapidly to direct the life-saving intervention to the correct anatomical cavity.

Determine the appropriate advanced imaging for the stable patients.

Patient 3 needs an abdominal CT to evaluate the intra-abdominal fluid seen on FAST. Patient 4 needs a chest CT angiography to evaluate the widened mediastinum.

Stable patients can safely undergo definitive cross-sectional imaging to guide precise nonoperative or operative management.

Key Concept

The primary determinant of the diagnostic and therapeutic algorithm in trauma is the patient's hemodynamic stability, followed by the identification of the bleeding source using adjuncts like the FAST exam.

Question 148Question →

Identify the most appropriate next step in management for each of the following burn-related clinical scenarios.

Click a left item, then click its matching right item

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Answer

The correct pairings match carbon monoxide poisoning to 100% oxygen, circumferential extremity ischemia to escharotomy, late rapid eschar separation to IV antibiotics, the tense abdomen triad to bladder pressure measurement, and early hypovolemic oliguria to increased fluid rates.

Each clinical scenario corresponds to a unique physiological complication of severe burns, requiring highly specific diagnostic or therapeutic interventions based on ATLS and standard burn care guidelines.

Step-by-Step Solution

Analyze the house fire presentation.

Identify carbon monoxide poisoning despite normal SpO2.

Standard oximetry cannot detect carboxyhemoglobin, making clinical signs and acidosis the key indicators for starting 100% oxygen.

Evaluate the circumferential burn presentation.

Identify extremity compartment syndrome.

Pain with passive extension and cool extremities signify critical ischemia requiring escharotomy.

Assess the day 7 burn patient's new symptoms.

Diagnose invasive burn wound sepsis.

Rapid eschar separation and systemic instability mandate immediate empiric antibiotics.

Analyze the massively resuscitated patient's triad.

Suspect abdominal compartment syndrome (ACS).

A tense abdomen with pulmonary and renal compromise requires bladder pressure measurement for confirmation.

Calculate expected urine output for the 70 kg patient.

Determine that 15 mL/hour is inadequate.

Target output is 0.5 mL/kg/hour (35 mL/hour), so the current rate reflects hypovolemia requiring increased fluids.

Key Concept

Diagnosis and management of acute and subacute burn complications including carbon monoxide poisoning, compartment syndrome, burn wound sepsis, abdominal compartment syndrome, and hypovolemia.

Estimated Time:2m 0s

Question 149Question →

A 31-year-old man is brought to the emergency department by ambulance after sustaining a stab wound to the abdomen during a physical altercation. On arrival, he is lethargic and pale. Vital signs are temperature $36.8^\circ\text{C}$ ( $98.2^\circ\text{F}$ ), blood pressure $78/42\text{ mmHg}$ , pulse $142/\text{min}$ , and respirations $24/\text{min}$ . Pulse oximetry is $97\%$ on high-flow oxygen. Primary survey reveals a patent airway and equal bilateral breath sounds. There is a single $4\text{ cm}$ laceration in the left upper quadrant, just below the costal margin. The patient's abdomen is markedly distended, rigid, and exhibits diffuse rebound tenderness. Peripheral pulses are thready. Two large-bore intravenous lines are established, and isotonic fluid resuscitation is initiated. Which of the following is the most appropriate next step in the management of this patient?

Immediate exploratory laparotomy

Computed tomography of the abdomen and pelvis

Focused assessment with sonography for trauma

Local wound exploration

Intravenous piperacillin-tazobactam and close observation

Show answer & explanation

Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy

The correct action is immediate exploratory laparotomy. This patient presents with penetrating abdominal trauma, profound hemodynamic instability (blood pressure

78/42\text{ mmHg}

, pulse

142/\text{min}

), and clear signs of peritonitis (abdominal rigidity, rebound tenderness). According to Advanced Trauma Life Support (ATLS) principles, the presence of hemodynamic instability, peritonitis, or evisceration following penetrating abdominal trauma are absolute indications for immediate surgical exploration. The primary goal is emergent hemorrhage control and repair of intra-abdominal injuries. Any further diagnostic testing would dangerously delay definitive, life-saving treatment.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient is in profound hypovolemic shock (blood pressure

78/42\text{ mmHg}

, pulse

142/\text{min}

, lethargy).

Hemodynamic stability dictates whether a trauma patient can safely undergo imaging or requires immediate surgical intervention.

Evaluate the mechanism of injury and abdominal exam findings.

The patient has penetrating abdominal trauma (stab wound) with clear signs of peritonitis (rigidity, diffuse rebound tenderness).

Peritonitis indicates hollow viscus perforation or severe intra-abdominal hemorrhage, both of which are absolute surgical indications.

Determine the next appropriate clinical step based on established trauma protocols.

The patient must be taken directly to the operating room for an exploratory laparotomy.

In penetrating abdominal trauma, hemodynamic instability or peritonitis mandates immediate laparotomy. Any delay for imaging is strictly contraindicated.

Key Concept

Hemodynamically unstable patients with penetrating abdominal trauma and signs of peritonitis have an absolute indication for immediate exploratory laparotomy.

Question 150Question →

A 38-year-old man is brought to the trauma bay following a high-speed motorcycle collision. He is confused and agitated. His blood pressure is 75/40 mm Hg, and his heart rate is 142/min. His airway is patent, and breath sounds are clear and equal bilaterally. The pelvis is clinically stable on examination, and there are no obvious sources of external hemorrhage. Arrange the following steps in the most appropriate chronological sequence for the evaluation and management of this patient's condition.

Drag items to arrange them in the correct order

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Answer

The correct sequence is to first establish intravenous access and initiate blood transfusion, then perform a FAST examination, subsequently transport the patient to the operating room for laparotomy, perform damage control surgery with temporary closure, and finally transfer the patient to the intensive care unit.

The management of hemodynamically unstable trauma patients follows a strict algorithm. After confirming adequate Airway and Breathing, Circulation is addressed by establishing large-bore intravenous access and initiating a massive transfusion protocol. Diagnostic adjuncts, specifically the FAST examination, are then utilized to rapidly identify the source of hemorrhage. An unstable patient with a presumed intra-abdominal source requires immediate exploratory laparotomy. During the operation, damage control surgery principles dictate that temporary abdominal closure should be performed once major hemorrhage and spillage are controlled, as the patient will not tolerate a prolonged definitive reconstruction. Finally, the patient is transferred to the intensive care unit to actively correct the lethal triad (hypothermia, acidosis, and coagulopathy) before returning to the operating room for a second-look procedure.

Step-by-Step Solution

Address the patient's Circulation (C in the ABCDE algorithm).

Two large-bore peripheral IV lines are established, and uncrossmatched blood products are initiated.

The patient is in Class IV hemorrhagic shock and requires immediate volume resuscitation before any other diagnostic maneuvers.

Perform a diagnostic adjunct to identify the source of bleeding.

A Focused Assessment with Sonography for Trauma (FAST) examination is performed.

In an unstable patient with blunt trauma, FAST is a rapid, bedside modality used to detect intra-abdominal hemorrhage without delaying definitive care.

Proceed to definitive hemorrhage control.

The patient is transported directly to the operating room for an exploratory laparotomy.

An unstable patient with suspected intra-abdominal bleeding requires immediate surgical exploration.

Apply damage control surgery principles during the operation.

The surgical team performs temporary abdominal closure.

Due to severe physiologic derangement (hemorrhagic shock), prolonged definitive repair will exacerbate the lethal triad; therefore, surgery is abbreviated.

Restore physiologic baseline before returning for definitive repair.

The patient is transferred to the surgical intensive care unit (ICU).

The patient must be actively warmed and resuscitated to correct acidosis, hypothermia, and coagulopathy before undergoing a second-look operation.

Key Concept

The management of unstable blunt abdominal trauma relies on immediate circulatory resuscitation, rapid point-of-care ultrasound (FAST), emergent operative hemorrhage control, and damage control principles to prevent the lethal triad.

Estimated Time:2m 0s

Question 151Question →

A 42-year-old woman is brought to the emergency department by ambulance following an all-terrain vehicle (ATV) rollover. She was thrown from the vehicle and struck her abdomen against a large rock. She reports severe diffuse abdominal pain. On presentation, her temperature is 36.6°C (97.9°F), blood pressure is 82/50 mmHg, pulse is 132/min, and respirations are 24/min. Intravenous fluid resuscitation with lactated Ringer's is initiated. Primary survey demonstrates an intact airway and clear, equal breath sounds bilaterally. The abdomen is visibly distended with diffuse involuntary guarding and rebound tenderness. Compression of the iliac crests reveals a stable pelvis. A bedside focused assessment with sonography for trauma (FAST) is performed and demonstrates an anechoic fluid collection in the hepatorenal recess (Morison pouch). Which of the following is the most appropriate next step in management?

Exploratory laparotomy

Computed tomography of the abdomen and pelvis

Diagnostic peritoneal lavage

Diagnostic laparoscopy

Angiography with selective arterial embolization

Show answer & explanation

Answer: Exploratory laparotomy

Answer

Exploratory laparotomy

The correct answer is exploratory laparotomy. According to the Advanced Trauma Life Support (ATLS) algorithm for blunt abdominal trauma, initial management involves assessing hemodynamic stability. In patients who are hemodynamically unstable (e.g., hypotension, tachycardia), a primary survey must be followed immediately by a bedside FAST exam to identify the source of bleeding. A positive FAST indicates massive intra-abdominal hemorrhage. The standard of care for these patients is emergent exploratory laparotomy to identify the injured organs, repair them, and stop the hemorrhage.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient is hemodynamically unstable, evidenced by hypotension (82/50 mmHg) and tachycardia (132/min).

Hemodynamic instability following blunt trauma indicates active, potentially life-threatening hemorrhage.

Identify the source of the hemorrhage.

The FAST exam is positive for anechoic fluid in the hepatorenal recess.

A positive FAST in the setting of trauma confirms the presence of intraperitoneal bleeding, likely from a solid organ injury.

Determine the definitive intervention based on ATLS guidelines.

Immediate exploratory laparotomy is required.

An unstable patient with confirmed intra-abdominal hemorrhage must be taken directly to the operating room to surgically control the bleeding.

Key Concept

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

Estimated Time:1m 0s

Question 152Question →

Emergency medical services bring a 24-year-old male to the trauma center following a high-velocity motorcycle collision. He was found approximately 30 meters from his vehicle without a helmet. Due to a severely depressed level of consciousness (Glasgow Coma Scale score of 5), he was intubated at the scene. Upon arrival, he is receiving mechanical ventilation. Vital signs show a blood pressure of $76/40 \text{ mmHg}$ and a heart rate of $142 \text{ /min}$ . Physical examination reveals a right pupil that is $7 \text{ mm}$ and unresponsive to light, while the left pupil is $3 \text{ mm}$ and reactive. Breath sounds are clear and symmetric bilaterally. A portable chest radiograph shows clear lung fields without pneumothorax. A portable pelvic radiograph demonstrates intact pelvic ring structures. Bedside ultrasonography of the abdomen demonstrates a significant anechoic fluid collection between the liver and the right kidney. Two large-bore intravenous lines are present, and the massive transfusion protocol is actively running. What is the most appropriate next step in the management of this patient?

Transfer the patient to the operating room for abdominal exploration

Transport the patient to the radiology suite for non-contrast cranial imaging

Administer a bolus of intravenous mannitol and begin targeted hyperventilation

Obtain a contrast-enhanced helical scan of the abdominopelvic region

Perform an emergency bedside diagnostic peritoneal lavage

Show answer & explanation

Answer: Transfer the patient to the operating room for abdominal exploration

Answer

Transfer the patient to the operating room for abdominal exploration

The correct action is to immediately transfer the patient to the operating room for abdominal exploration. This patient presents with a classic 'competing priorities' trauma scenario: impending uncal herniation (indicated by the fixed, dilated right pupil and depressed GCS) versus active, massive intra-abdominal hemorrhage (indicated by profound shock and a positive bedside ultrasound). According to Advanced Trauma Life Support (ATLS) principles, circulation and hemorrhage control must be established to ensure any end-organ perfusion, including the brain. Cerebral Perfusion Pressure (CPP) is defined as Mean Arterial Pressure (MAP) minus Intracranial Pressure (ICP). Without restoring the MAP by surgically stopping the bleeding, all neurosurgical interventions will fail. Therefore, the immediate priority is an exploratory laparotomy. The neurosurgery team should be consulted to evaluate the patient simultaneously in the operating room, where interventions such as placing an intracranial pressure monitor or performing burr holes can occur concurrently with the laparotomy.

Step-by-Step Solution

Assess the patient's primary survey and hemodynamic status.

The patient has a secured airway and adequate breathing, but is in severe hemorrhagic shock (blood pressure

76/40 \text{ mmHg}

, heart rate

142 \text{ /min}

ATLS protocols dictate a strict ABCDE approach, prioritizing immediate life threats.

Identify the source of hemorrhage using physical exam and bedside adjuncts.

Chest and pelvic radiographs are negative, but bedside ultrasound reveals fluid in Morison's pouch (hemoperitoneum).

Rapid identification of the bleeding source directs definitive surgical management.

Evaluate competing clinical priorities (Traumatic Brain Injury vs. Hemorrhagic Shock).

The patient has signs of uncal herniation (blown right pupil, low GCS). However, cerebral perfusion cannot be maintained without adequate systemic blood pressure.

While neurosurgical intervention is urgently needed, hemorrhagic shock is the most immediate threat to life and must be addressed first.

Determine the definitive next step.

The patient must be taken immediately to the operating room to stop the intra-abdominal bleeding.

Hemodynamically unstable trauma patients should never be transported to a CT scanner. Neurosurgery can be consulted to perform concurrent interventions in the operating room.

Key Concept

In patients with multiple traumatic injuries including severe traumatic brain injury and active intra-abdominal hemorrhage, immediate operative control of bleeding (laparotomy) takes precedence over diagnostic imaging of the brain.

Estimated Time:2m 0s

Question 153Question →

A 19-year-old male collegiate rugby player collapses on the field after being tackled forcefully around the midsection by an opposing player. He is rushed to the emergency department. En route, emergency medical services administer 2 L of intravenous crystalloid solution. On arrival, he is restless and complaining of severe abdominal pain. His temperature is 36.1°C (97.0°F), pulse is 142/min, blood pressure is 76/40 mm Hg, and respiratory rate is 26/min. Oxygen saturation is 98% on high-flow oxygen. Physical examination reveals an exquisitely tender, board-like abdomen with severe rebound tenderness across all four quadrants. There is early ecchymosis developing over the periumbilical area. The pelvis is mechanically stable to anteroposterior and lateral compression. Cardiopulmonary auscultation reveals clear breath sounds bilaterally. Which of the following interventions should be prioritized next for this patient?

Transfer directly to the operating room for exploratory laparotomy

Perform a bedside focused assessment with sonography for trauma

Obtain a contrast-enhanced computed tomography scan of the abdomen

Execute a diagnostic peritoneal lavage in the emergency department

Admit to the surgical intensive care unit for serial abdominal examinations

Show answer & explanation

Answer: Transfer directly to the operating room for exploratory laparotomy

Answer

Immediate transfer to the operating room for an exploratory laparotomy is required due to the combination of severe hemodynamic instability and acute peritonitis.

This patient presents with hemorrhagic shock and an acute surgical abdomen (peritonitis) following blunt abdominal trauma. According to ATLS protocols, hemodynamically unstable patients who exhibit unequivocal signs of peritonitis (e.g., rigid, board-like abdomen, rebound tenderness) require immediate surgical exploration. Proceeding directly to an exploratory laparotomy is the only appropriate step to rapidly achieve hemostasis and control hollow viscus contamination. No further diagnostic workup is needed before surgery.

Step-by-Step Solution

Assess the patient's hemodynamic status.

The patient is in class III/IV hemorrhagic shock with a blood pressure of 76/40 mm Hg and a heart rate of 142/min despite 2 L of crystalloid resuscitation.

Hemodynamic instability dictates whether the patient can safely undergo time-consuming diagnostic imaging or requires immediate intervention.

Evaluate the abdominal physical examination findings.

The patient exhibits a board-like abdomen with severe rebound tenderness.

These are unequivocal signs of peritonitis, indicating massive intra-abdominal hemorrhage or hollow viscus perforation.

Apply the Advanced Trauma Life Support (ATLS) algorithm for blunt abdominal trauma.

The combination of shock and clear peritonitis mandates emergent laparotomy.

This specific clinical presentation bypasses the need for a FAST exam to achieve immediate surgical source control.

Key Concept

In patients with blunt abdominal trauma, the presence of hemodynamic instability combined with unequivocal peritonitis mandates immediate exploratory laparotomy, bypassing FAST or CT imaging.

Estimated Time:1m 15s

Question 154Question →

A 28-year-old man is brought to the emergency department via ambulance after being rescued from a house fire. The incident occurred exactly 2 hours prior to arrival. He weighs $80$ kg. Primary survey reveals a patent airway, clear breath sounds bilaterally, and a heart rate of $115$ /min. Physical examination shows deep partial-thickness and full-thickness burns covering his entire anterior torso, entire right arm, and the anterior surface of his right leg. Peripheral intravenous access is established. Based on current Advanced Trauma Life Support (ATLS) guidelines for adult thermal burn resuscitation (using $2 \text{ mL/kg/\%TBSA}$ ), what should be the initial intravenous crystalloid fluid infusion rate programmed for the remainder of the first 8 hours post-injury?

Show answer & explanation

Answer: 480

Answer

480 mL/hr

The patient requires acute burn resuscitation based on the extent of his injuries and time elapsed. The Rule of Nines dictates that the anterior torso is 18%, the entire right arm is 9%, and the anterior right leg is 9%, resulting in a 36% TBSA. Using the current ATLS recommendation of

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

, the total 24-hour fluid requirement is

2 \times 80 \times 36 = 5760 \text{ mL}

. Half of this volume (

2880 \text{ mL}

) must be given in the first 8 hours calculated from the time of injury. Because 2 hours have already passed since the fire, the remaining

2880 \text{ mL}

must be infused over the next 6 hours, yielding a target rate of

480 \text{ mL/hr}

Step-by-Step Solution

Calculate the involved Total Body Surface Area (TBSA).

TBSA = 36%

The Rule of Nines assigns 18% to the anterior torso, 9% to an entire arm, and 9% to the anterior half of a leg.

Calculate the total 24-hour fluid resuscitation volume.

Total volume = 5760 mL

Using the ATLS formula:

2 \text{ mL} \times 80 \text{ kg} \times 36\% \text{ TBSA} = 5760 \text{ mL}

Determine the fluid volume for the first 8 hours.

First 8-hour volume = 2880 mL

Half of the total 24-hour fluid requirement must be given in the first 8 hours post-injury (

5760 / 2 = 2880 \text{ mL}

Calculate the hourly infusion rate.

Infusion rate = 480 mL/hr

The 2880 mL must be administered over the remaining 6 hours of the first 8-hour window (8 hours - 2 hours elapsed = 6 hours).

2880 / 6 = 480 \text{ mL/hr}

Key Concept

Burn fluid resuscitation calculations require determining TBSA via the Rule of Nines, calculating the 24-hour fluid requirement, and administering half of that total volume over the first 8 hours, strictly calculated from the time of injury (not the time of hospital presentation).

Question 155Question →

A 35-year-old male construction worker is brought to the emergency department after falling 20 feet (6 meters) from a scaffold. He is secured to a backboard with a rigid cervical collar in place. He is obtunded, opens his eyes only to painful stimuli, and makes incomprehensible sounds. Vital signs are temperature 36.5°C (97.7°F), blood pressure 75/45 mm Hg, pulse 135/min, and respirations 28/min. Pulse oximetry shows 88% on high-flow oxygen. Physical examination reveals copious blood in the oropharynx with audible gurgling. There are absent breath sounds and dullness to percussion over the right hemithorax. The abdomen is grossly distended and rigid. Arrange the following management steps in the most appropriate sequential order according to the Advanced Trauma Life Support (ATLS) protocol.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence follows the ATLS primary survey (ABCDE): Airway management (intubation), Breathing (tube thoracostomy), Circulation (blood products), Adjunct evaluation (FAST), and finally Definitive care (laparotomy).

The Advanced Trauma Life Support (ATLS) protocol mandates a strict primary survey sequence: Airway, Breathing, Circulation, Disability, and Exposure. This algorithm ensures that the most imminent threats to life are identified and treated first. In this patient, the obstructed airway (gurgling, GCS 8) must be secured first. Next, the breathing compromise from a hemothorax must be treated with a chest tube. Only then is circulation addressed with blood products. Following stabilization of the ABCs, a FAST exam is used as an adjunct to identify the source of abdominal shock, culminating in definitive surgical management via laparotomy.

Step-by-Step Solution

Assess and secure the airway.

The patient undergoes oropharyngeal suctioning and endotracheal intubation.

Airway compromise (gurgling, blood, GCS 8) is the most immediate threat to life and must be addressed first.

Assess breathing and ventilation.

A right-sided tube thoracostomy is placed.

The patient has absent breath sounds and dullness to percussion, indicating a massive hemothorax that must be drained to allow lung expansion.

Assess and manage circulation.

Intravenous access is obtained and uncrossmatched blood products are administered.

The patient is in hemorrhagic shock (hypotension, tachycardia) and requires immediate volume resuscitation following airway and breathing stabilization.

Perform diagnostic adjuncts.

A bedside FAST examination is performed.

With the ABCs addressed, an ultrasound is used to rapidly identify the source of intra-abdominal hemorrhage causing the rigid, distended abdomen.

Provide definitive care.

The patient is transferred to the operating room.

An unstable trauma patient with a surgical abdomen requires emergent exploratory laparotomy to definitively control the bleeding.

Key Concept

Advanced Trauma Life Support (ATLS) primary survey sequence prioritizing Airway, Breathing, and Circulation before diagnostic adjuncts and definitive surgical care.

Question 156Question →

Emergency medical services via helicopter transport a 22-year-old male to the trauma center following a high-speed motorcycle crash. Upon arrival, he has a traumatic partial amputation of the left lower leg. Bright red blood is spurting profusely through the prehospital bandages despite direct pressure. The patient is unresponsive, with a Glasgow Coma Scale score of 6, and is making gurgling respiratory sounds. His abdomen is markedly distended and rigid to palpation. Vital signs are temperature $35.2^\circ\text{C}$ ( $95.4^\circ\text{F}$ ), heart rate $148/\text{min}$ , blood pressure $70/40 \text{ mm Hg}$ , and respiratory rate $8/\text{min}$ . Large-bore intravenous access is currently being established. Arrange the following management steps in the most appropriate chronological order according to current Advanced Trauma Life Support (ATLS) and damage control surgery principles.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence begins with catastrophic hemorrhage control, followed by securing the airway, identifying the internal bleeding source via FAST, performing a damage control exploratory laparotomy, and finally temporarily closing the abdomen for ICU resuscitation.

The sequence perfectly follows the modern Advanced Trauma Life Support (ATLS) paradigm and damage control surgery principles. It begins with <C> (catastrophic hemorrhage control via tourniquet) before A (airway management via intubation). This is followed by a primary survey adjunct (FAST exam) to locate the source of internal bleeding contributing to the patient's profound shock. Because the patient is hemodynamically unstable with a rigid abdomen, an immediate exploratory laparotomy is prioritized to control truncal hemorrhage. Finally, damage control principles dictate that due to the patient's severe physiologic derangement (temperature

35.2^\circ\text{C}

, shock), the surgeon must perform a temporary abdominal closure and transfer the patient to the surgical ICU to correct the lethal triad (hypothermia, acidosis, coagulopathy) prior to any definitive orthopedic or abdominal reconstructive procedures.

Step-by-Step Solution

Apply a tourniquet to the amputated leg.

Arterial spurting is halted.

Exsanguinating external hemorrhage kills faster than airway compromise; it must be addressed first in the modern <C>ABCDE trauma protocol.

Perform endotracheal intubation.

The airway is secured and oxygenation is supported.

The patient is comatose (GCS 6) with an unprotected airway (gurgling), requiring immediate definitive airway management with cervical spine precautions.

Perform a FAST examination.

Intra-abdominal fluid is rapidly identified.

As an adjunct to the primary survey, FAST identifies the source of non-compressible internal hemorrhage causing the profound shock (BP 70/40).

Transfer to the OR for exploratory laparotomy.

Truncal hemorrhage and gross contamination are controlled.

Hemodynamically unstable patients with intra-abdominal bleeding require immediate surgical hemorrhage control, precluding CT scans or definitive orthopedic interventions.

Perform temporary abdominal closure and transfer to the ICU.

The surgery is abbreviated, allowing for physiologic recovery.

The patient exhibits the lethal triad (hypothermia, coagulopathy, acidosis). Damage control surgery requires abandoning definitive repairs until the physiology is corrected in the ICU.

Key Concept

The <C>ABCDE primary survey algorithm and damage control surgery principles in hemodynamically unstable trauma patients.

Question 157Question →

A 30-year-old G1P0 woman at 35 weeks gestation is brought to the trauma center after being involved in a high-speed motor vehicle collision as the unrestrained driver. On arrival, she is lethargic but conversant and protecting her airway. She is placed on a backboard with left lateral tilt and receives 2 liters of warmed intravenous crystalloids. Reassessment reveals a blood pressure of 78/42 mm Hg and a heart rate of 135/min. Breath sounds are clear and equal bilaterally. Her abdomen is gravid, rigid, and diffusely tender with rebound and guarding. Bedside focused assessment with sonography for trauma (FAST) demonstrates a large volume of free fluid in the hepatorenal recess. Fetal monitoring shows a baseline heart rate of 115/min with recurrent late decelerations. Arterial blood gas analysis reveals a pH of 7.21, $pCO_2$ of 25 mm Hg, and $HCO_3^-$ of 10 mEq/L. Which of the following is the most appropriate next step in management?

Exploratory laparotomy

Computed tomography of the abdomen and pelvis

Immediate cesarean delivery

Intravenous sodium bicarbonate infusion

Nasogastric tube placement and serial abdominal examinations

Show answer & explanation

Answer: Exploratory laparotomy

Answer

Exploratory laparotomy

The patient is in hemorrhagic shock due to blunt abdominal trauma, as evidenced by hypotension, tachycardia, and a positive FAST examination. According to Advanced Trauma Life Support (ATLS) protocols, the most appropriate next step for a hemodynamically unstable patient with a positive FAST is emergent exploratory laparotomy to identify and control the source of hemorrhage. In a pregnant trauma patient, maternal stabilization is always the paramount priority. The fetal late decelerations indicate uteroplacental insufficiency directly caused by maternal hypovolemia and shock. Restoring maternal hemodynamics through surgical hemorrhage control is the most effective way to address the fetal distress.

Step-by-Step Solution

Assess the patient's hemodynamic status following initial fluid resuscitation.

The patient remains in profound shock with a blood pressure of 78/42 mm Hg and heart rate of 135/min.

Persistent hemodynamic instability dictates an urgent, definitive intervention pathway in the ATLS algorithm.

Identify the source of the shock using primary survey adjuncts.

The positive FAST exam and rigid abdomen confirm significant intra-abdominal hemorrhage.

Identifying the compartment of hemorrhage directs the surgical team to the correct operative intervention.

Evaluate fetal status in the context of maternal trauma and shock.

Late decelerations indicate uteroplacental hypoperfusion directly caused by maternal hypovolemia.

Fetal distress in this setting is a secondary complication; maternal survival and hemodynamic restoration dictate fetal survival.

Determine the definitive next step for hemorrhage control.

Exploratory laparotomy is urgently indicated.

According to ATLS guidelines, unstable trauma patients with a positive FAST require immediate laparotomy to stop the bleeding.

Key Concept

Maternal stabilization via exploratory laparotomy is the paramount priority in an unstable pregnant trauma patient with a positive FAST, as treating the maternal hemorrhagic shock is the only effective way to resolve secondary fetal distress.

Question 158Question →

A 68-year-old man is evaluated in the surgical intensive care unit for sudden-onset hypotension and altered mental status. He was admitted 3 days ago after a severe motor vehicle collision. His initial injuries included multiple left-sided rib fractures, bilateral pulmonary contusions, and a grade III liver laceration that was managed nonoperatively. His past medical history includes heart failure with preserved ejection fraction and chronic obstructive pulmonary disease (COPD).

Currently, his blood pressure is 76/45 mm Hg and his heart rate is 135/min. Oxygen saturation is 89% on 4 L/min via nasal cannula. His temperature is 38.3°C (100.9°F). Physical examination reveals a rigid, distended abdomen with involuntary guarding and rebound tenderness. Auscultation of the lungs reveals decreased breath sounds at the bases with scattered wheezes.

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

Exploratory laparotomy

Computed tomography scan of the abdomen and pelvis

Nasogastric tube decompression and serial abdominal examinations

Duplex ultrasonography of the lower extremities

Intravenous furosemide and noninvasive positive-pressure ventilation

Show answer & explanation

Answer: Exploratory laparotomy

Answer

Exploratory laparotomy

The correct answer is exploratory laparotomy. This patient is exhibiting clear signs of peritonitis (a rigid abdomen, guarding, and rebound tenderness) along with profound hemodynamic instability (blood pressure 76/45 mm Hg, heart rate 135/min). In the setting of recent blunt abdominal trauma, these findings strongly suggest a catastrophic intra-abdominal event, such as the delayed rupture of his previously managed liver laceration or a missed hollow viscus injury leading to septic shock. Any trauma patient who is hemodynamically unstable with a clear intra-abdominal source (evident by peritonitis or a positive FAST exam) must be taken immediately to the operating room for an exploratory laparotomy to control hemorrhage and limit viscous contamination.

Step-by-Step Solution

Analyze the patient's vital signs and clinical stability.

The patient is in profound shock, indicated by a blood pressure of 76/45 mm Hg and a heart rate of 135/min.

Hemodynamic status determines whether a trauma patient can safely undergo cross-sectional imaging.

Evaluate the physical examination findings.

The examination reveals a rigid, distended abdomen with guarding and rebound tenderness.

These findings are hallmark signs of peritonitis, indicating an intra-abdominal catastrophe.

Synthesize the findings to determine the next best step.

The combination of hemodynamic instability and peritonitis requires immediate operative intervention.

Delayed rupture of a solid organ or a missed hollow viscus injury with subsequent sepsis must be addressed directly in the operating room.

Key Concept

Trauma patients who exhibit hemodynamic instability along with peritonitis (e.g., rigid abdomen, guarding) must undergo immediate exploratory laparotomy, bypassing further diagnostic imaging.

Question 159Question →

Review the following trauma patient presentations and pair each one with its definitive diagnostic modality or most appropriate immediate intervention.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The unstable patient with a positive FAST requires exploratory laparotomy. The unstable pelvic fracture patient with a negative FAST requires pelvic angiography with embolization. The straddle injury patient with meatal blood requires retrograde urethrography. The stable patient with a widened mediastinum requires CT angiography of the chest.

Trauma management relies on strict algorithmic adherence. Intra-abdominal hemorrhage causing shock requires laparotomy. Unstable pelvic bleeding refractory to a binder requires angiography. Urethral injury signs mandate retrograde imaging to prevent complete transection. Finally, suspected blunt aortic injury in a stable patient is confirmed with CT angiography.

Step-by-Step Solution

Evaluate the first patient's stability and ultrasound findings

The patient is unstable (BP 70/40) with free intra-abdominal fluid.

Positive FAST in a hypotensive patient dictates immediate surgical exploration.

Evaluate the second patient's response to initial stabilization

The patient remains unstable despite a pelvic binder and has a negative FAST.

This presentation isolates the retroperitoneal space as the bleeding source, requiring angiographic intervention.

Identify contraindications in the third patient

Meatal blood and a high-riding prostate are present.

These findings contraindicate blind Foley catheter placement; urethral integrity must be mapped radiographically first.

Analyze the fourth patient's chest radiograph

A widened mediastinum is noted in a stable patient.

While highly suspicious for aortic injury, the patient's stability allows for definitive non-invasive imaging via CT angiography before determining surgical or endovascular needs.

Key Concept

Advanced Trauma Life Support (ATLS) algorithms dictate specific diagnostic and therapeutic pathways based heavily on the patient's hemodynamic stability and precise mechanism of injury.

Question 160Question →

A 25-year-old man is brought to the emergency department after being involved in a chemical plant fire. The incident occurred exactly 3 hours prior to his arrival. His weight is $70 \text{ kg}$ . Primary survey reveals a patent airway, but due to facial burns, he is electively intubated. Physical examination reveals deep partial-thickness and full-thickness burns involving his entire head and neck, his entire anterior trunk, and circumferential burns to both arms. There are no other burn injuries identified. Two large-bore intravenous catheters are placed. According to the traditional Parkland formula ( $4 \text{ mL/kg/\% TBSA}$ ), what should be the initial rate of intravenous crystalloid infusion for the remainder of the first 8-hour post-burn period?

Show answer & explanation

Answer: 1260

Answer

1260

The correct initial infusion rate is

1,260 \text{ mL/hr}

. First, the percentage of burned body surface area (TBSA) is estimated using the Rule of Nines: the entire head and neck (

9\%

), the entire anterior trunk (

18\%

), and circumferential burns to both arms (

9\% + 9\% = 18\%

). This results in a total TBSA of

45\%

. Second, using the traditional Parkland formula, the total 24-hour fluid requirement is calculated as

4 \text{ mL} \times 70 \text{ kg} \times 45\% = 12,600 \text{ mL}

. Third, exactly half of this volume (

6,300 \text{ mL}

) must be administered within the first 8 hours following the time of injury. Finally, because the patient arrived exactly 3 hours after the incident, there are only 5 hours remaining in this 8-hour window. The required hourly rate to deliver the necessary

6,300 \text{ mL}

6,300 \text{ mL} / 5 \text{ hours} = 1,260 \text{ mL/hr}

Step-by-Step Solution

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

TBSA = 45%

The Parkland formula requires an accurate estimation of the percentage of body surface area affected by second- and third-degree burns.

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

4 \text{ mL} \times \text{weight in kg} \times \text{\% TBSA}

Total Volume = 12,600 mL

This formula determines the massive fluid shift compensation required over the first 24 hours.

Determine the fluid volume required during the first 8 hours post-injury.

First 8-hour volume = 6,300 mL

Half of the calculated 24-hour total fluid requirement must be administered in the first 8 hours from the time of injury.

Calculate the time remaining in the first 8-hour window by subtracting the pre-hospital delay time.

Remaining time = 5 hours

The 8-hour clock starts at the moment of injury, not at the time of hospital arrival. The 3-hour delay must be subtracted from the 8-hour window.

Calculate the initial hourly infusion rate by dividing the required volume by the remaining time.

Infusion rate = 1260 mL/hr

This ensures the patient receives the necessary initial half of the fluid resuscitation within the strict 8-hour physiologic window.

Key Concept

Parkland formula resuscitation requires calculating TBSA via the Rule of Nines and delivering half the total calculated 24-hour volume within 8 hours from the TIME OF INJURY, adjusting the infusion rate for any presentation delay.

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