Examkin

Surgery

1344 questions

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Question 901Question →

A 1313-year-old boy is brought to the pediatric clinic by his mother due to a 44-week history of a right-sided limp and intermittent dull pain in his right anterior thigh and knee. He denies any recent trauma, fever, or prior episodes of similar pain. His medical history is unremarkable. His height is at the 50th50^{\text{th}} percentile and weight is at the 97th97^{\text{th}} percentile for his age. Vital signs are within normal limits. Physical examination reveals a waddling, antalgic gait. The right knee examination shows no effusions, joint line tenderness, or ligamentous laxity. On examination of the right hip, internal rotation is significantly restricted compared to the left. When the clinician passively flexes the right hip to 90∘90^\circ, the right thigh obligatorily rotates externally. Radiographs of the pelvis demonstrate posterior and inferior displacement of the right proximal femoral epiphysis. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Strict non-weight-bearing and prompt percutaneous in situ screw fixation

Answer

Strict non-weight-bearing and prompt percutaneous in situ screw fixation is the standard of care to stabilize the physis and prevent further displacement.
The correct intervention is strict non-weight-bearing and prompt percutaneous in situ screw fixation. The patient's clinical presentation (obese adolescent, thigh/knee pain, obligatory external rotation with hip flexion) and radiographic findings confirm the diagnosis of Slipped Capital Femoral Epiphysis (SCFE). In SCFE, the proximal femoral epiphysis displaces posteriorly and inferiorly relative to the metaphysis through the growth plate. The primary goal of treatment is to prevent further slippage by mechanically stabilizing the physis. This is achieved via percutaneous placement of a single screw across the physis (in situ fixation) as soon as the diagnosis is made.

Step-by-Step Solution

1
Analyze the patient's demographics, clinical presentation, and physical exam findings.
The patient is an obese adolescent boy with referred knee/thigh pain, a limp, and obligatory external rotation of the hip with passive flexion, which is the classic presentation of Slipped Capital Femoral Epiphysis (SCFE).
Referred pain to the knee is a common pitfall in diagnosing pediatric hip disorders. Obligatory external rotation is the hallmark physical exam sign of SCFE.
2
Interpret the described diagnostic imaging.
Pelvic radiographs confirm posterior and inferior displacement of the proximal femoral epiphysis.
Plain radiographs definitively diagnose SCFE, eliminating the need for further diagnostic studies like MRI or joint aspirations.
3
Determine the most appropriate definitive management.
Immediate non-weight-bearing status and urgent percutaneous in situ screw fixation.
Surgical pinning stabilizes the physis to prevent further slippage. Attempting closed reduction is contraindicated due to the high risk of avascular necrosis of the femoral head.

Key Concept

Management of Slipped Capital Femoral Epiphysis (SCFE)
Question 902Question →

A 38-year-old male is brought to the emergency department after a high-speed collision in which his snowmobile struck a tree. Upon arrival, he is in severe respiratory distress. Vital signs are blood pressure 80/50 mm Hg, heart rate 138/min, and respiratory rate 32/min. Oxygen saturation is 86% on a non-rebreather mask. Physical examination reveals absent breath sounds over the left hemithorax and dullness to percussion. The trachea is deviated to the right. The abdomen is noticeably scaphoid and diffusely tender to palpation. A needle thoracostomy is immediately performed in the left second intercostal space, yielding a small rush of air but no significant clinical improvement. A subsequent tube thoracostomy in the left fifth intercostal space returns 200 mL of dark blood mixed with particulate matter resembling partially digested food. Which of the following is the most appropriate next step in management?

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Answer: Exploratory laparotomy

Answer

Exploratory laparotomy is the required next step to address the acute diaphragmatic rupture and visceral perforation.
The patient presents with hemodynamic instability, a scaphoid abdomen, and food particles returning from a chest tube following high-velocity blunt trauma. This classic constellation indicates an acute traumatic diaphragmatic rupture with herniation of gastric contents into the left hemithorax, complicated by gastric perforation (either from the trauma itself or iatrogenically during chest tube placement). In the acute trauma setting, a ruptured diaphragm with visceral herniation requires an immediate exploratory laparotomy. The transabdominal approach is mandatory because it facilitates the reduction of herniated viscera back into the abdomen and allows for thorough evaluation and repair of commonly associated intra-abdominal injuries, such as splenic or bowel lacerations.

Step-by-Step Solution

1
Analyze the patient's hemodynamic status.
Blood pressure is 80/50 mm Hg and heart rate is 138/min.
Establishing that the patient is in severe shock dictates that immediate life-saving interventions take precedence over advanced diagnostic imaging.
2
Interpret the respiratory and thoracic physical exam findings.
Absent breath sounds, dullness to percussion on the left, and rightward tracheal deviation.
These signs suggest a left-sided space-occupying lesion. The dullness to percussion points toward fluid or solid tissue (e.g., hemothorax or herniated organs) rather than a simple tension pneumothorax, which would typically be hyperresonant.
3
Synthesize the abdominal findings and procedural output.
The abdomen is scaphoid (empty) and the chest tube returns partially digested food.
A scaphoid abdomen combined with intrathoracic food particles confirms an acute traumatic diaphragmatic rupture with herniation and subsequent perforation of the stomach into the pleural cavity.
4
Determine the definitive surgical approach.
Select exploratory laparotomy.
Acute traumatic diaphragmatic injuries require a transabdominal approach to reduce herniated organs, repair the diaphragmatic defect, and explore for frequently associated intra-abdominal visceral injuries.

Key Concept

Management of acute traumatic diaphragmatic rupture
Estimated Time:2m 0s
Question 903Question →

Emergency medical services bring a 2828-year-old male to the trauma bay following a high-speed motorcycle collision. He was found unresponsive at the scene. Currently, the patient is obtunded but his airway remains patent with equal bilateral breath sounds. Initial vital signs include a blood pressure of 70/40 mmHg70/40\text{ mmHg} and a heart rate of 142 beats/min142\text{ beats/min}. Abdominal examination shows severe distension and a rigid contour with prominent ecchymosis over the lower quadrants. A bedside focused assessment with sonography for trauma (FAST) reveals a large volume of anechoic fluid in the hepatorenal recess and pelvis. Peripheral intravenous access is secured and crystalloid fluid administration is started. Which of the following is the most appropriate next step in management?

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Answer: Exploratory laparotomy

Answer

The correct answer is exploratory laparotomy.
The most appropriate next step for a hemodynamically unstable patient with blunt abdominal trauma and a positive FAST examination is an immediate exploratory laparotomy. This patient is in class IV hemorrhagic shock, evidenced by profound hypotension and marked tachycardia. The rigid, distended abdomen and positive FAST indicate massive intra-abdominal hemorrhage. Emergent surgical exploration is required to identify and control the source of bleeding.

Step-by-Step Solution

1
Evaluate the patient's hemodynamic status based on vital signs.
The patient is in profound hemorrhagic shock, evidenced by a blood pressure of 70/40 mmHg and a heart rate of 142 beats/min.
Hemodynamic instability dictates the urgency and type of subsequent interventions in the Advanced Trauma Life Support (ATLS) algorithm.
2
Identify the source of the shock using the primary survey and bedside imaging.
The rigid abdomen and positive FAST exam confirm a massive intra-abdominal hemorrhage.
Rapid identification of the bleeding source is necessary to direct life-saving therapy.
3
Determine the definitive treatment for the identified pathology.
Immediate transfer to the operating room for an exploratory laparotomy.
Hemodynamically unstable patients with confirmed intra-abdominal bleeding require emergent surgical control of the hemorrhage.

Key Concept

In hemodynamically unstable patients with blunt abdominal trauma, a positive FAST exam is an absolute indication for immediate exploratory laparotomy.
Question 904Question →

A 72-year-old man is brought to the emergency department from a skilled nursing facility due to severe abdominal pain and intractable vomiting over the past 24 hours24\text{ hours}. The accompanying documentation notes he has not had a bowel movement or passed flatus since yesterday. His medical history is significant for hypertension and benign prostatic hyperplasia. His temperature is 38.6∘C38.6^\circ\text{C} (101.5∘F101.5^\circ\text{F}), pulse is 118/min118/\text{min}, and blood pressure is 96/58 mmHg96/58\text{ mmHg}. Physical examination reveals a significantly distended and tympanic abdomen. Examination of the groin shows a 5-cm5\text{-cm}, tense, erythematous bulge in the right inguinal region that is exquisitely tender to palpation. Attempts to gently reduce the mass are unsuccessful. Laboratory studies show a leukocyte count of 17,500/mm317,500/\text{mm}^3 and a serum lactate level of 4.1 mmol/L4.1\text{ mmol/L} (normal: 0.5−2.2 mmol/L0.5-2.2\text{ mmol/L}). Which of the following is the most appropriate next step in management?

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Answer: Urgent surgical exploration

Answer

Urgent surgical exploration
The correct action is urgent surgical exploration. This patient's clinical presentation is highly indicative of a strangulated right inguinal hernia resulting in an acute small bowel obstruction (SBO) and subsequent bowel ischemia. Strangulation occurs when the blood supply to the herniated tissue is compromised. Hallmarks of strangulation include an exquisitely tender, irreducible, erythematous mass, accompanied by systemic signs of sepsis and ischemia, such as fever, tachycardia, hypotension, marked leukocytosis, and an elevated serum lactate level. This is a surgical emergency. Immediate operative exploration is necessary to assess the viability of the herniated bowel, resect any necrotic segments, and repair the hernia defect to prevent further intra-abdominal sepsis and death.

Step-by-Step Solution

1
Identify the primary clinical syndrome from the patient's presentation.
The patient has symptoms of a complete small bowel obstruction (intractable vomiting, distension, failure to pass flatus/stool).
Recognizing the obstructive pattern is the first step in diagnosing an acute abdomen.
2
Determine the etiology of the obstruction and look for complications.
The patient has a tense, erythematous, irreducible inguinal hernia with systemic signs of toxicity (fever, tachycardia, hypotension, leukocytosis, elevated lactate).
These findings indicate the hernia is strangulated, meaning the blood supply is compromised and bowel ischemia/necrosis is occurring.
3
Select the appropriate management strategy based on the presence of ischemia.
Immediate surgical intervention is required to evaluate bowel viability, resect necrotic segments, and repair the hernia.
Strangulated bowel is a surgical emergency; any delay for imaging or conservative management increases mortality.

Key Concept

A strangulated hernia causing a small bowel obstruction presents with an irreducible, painful mass along with signs of ischemia (fever, leukocytosis, elevated lactate) and requires immediate surgical exploration.
Question 905Question →

A 56-year-old man is brought to the emergency department after a high-speed motor vehicle collision. He was the restrained driver in a head-on impact with a concrete pillar. His airway is secure, and breath sounds are equal bilaterally. Vital signs show a heart rate of 118/min and a blood pressure of 165/92 mmHg. He is alert but complains of severe interscapular back pain. Secondary survey reveals a seatbelt sign across the chest. A portable anteroposterior chest radiograph obtained in the trauma bay demonstrates a widened mediastinum and loss of the aortic knob contour. The patient remains hemodynamically stable. Arrange the following diagnostic and therapeutic steps in the most appropriate chronological sequence for the optimal management of this patient.

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Answer

The correct sequence prioritizes immediate prevention of catastrophic rupture: 1) Initiate intravenous beta-blockade, 2) Perform CTA of the chest, 3) Proceed with TEVAR, and 4) Obtain follow-up surveillance imaging.
In cases of suspected blunt thoracic aortic injury (BTAI) in a hemodynamically stable patient, the immediate priority is to prevent complete aortic rupture. This is achieved through anti-impulse therapy (intravenous beta-blockers) to reduce the heart rate and blood pressure, thereby decreasing the shearing forces on the injured aorta. Only after the hemodynamics are strictly controlled should the patient be moved for definitive diagnostic imaging via CTA. Once the anatomy of the injury is defined, definitive treatment with thoracic endovascular aortic repair (TEVAR) is performed, which necessitates subsequent long-term surveillance imaging.

Step-by-Step Solution

1
Recognize signs of blunt thoracic aortic injury (BTAI).
The mechanism of injury, severe interscapular pain, and widened mediastinum raise high suspicion for a contained aortic rupture.
Identifying a potential life-threatening aortic injury dictates the immediate prioritization of preventing a free rupture.
2
Initiate anti-impulse therapy before transferring the patient.
Esmolol is administered to lower the heart rate to less than 100/min and systolic blood pressure to less than 100 mmHg.
Reducing left ventricular dP/dt minimizes shear stress on the injured aortic wall, preventing catastrophic free rupture during evaluation.
3
Obtain definitive imaging.
A CTA of the chest is performed.
CTA accurately characterizes the injury (e.g., intimal tear, pseudoaneurysm) and provides the precise anatomical measurements required for endograft sizing.
4
Perform definitive repair.
The patient undergoes Thoracic Endovascular Aortic Repair (TEVAR).
Endovascular repair is the modern standard of care for BTAI, followed by necessary long-term surveillance.

Key Concept

Management algorithm for Blunt Thoracic Aortic Injury (BTAI)
Question 906Question →

A 35-year-old man is brought to the emergency department after a structural fire. He weighs 80 kg80 \text{ kg}. The burn injury occurred exactly 2 hours prior to his arrival at the emergency department. Physical examination reveals deep partial-thickness and full-thickness burns involving the entire anterior surface of his torso, his entire right arm, and the entire anterior surface of his right leg. No other burn injuries are identified. Using the traditional Parkland formula (4 mL/kg4 \text{ mL/kg} per percentage of total body surface area), what should be the target intravenous fluid administration rate (in mL/hr\text{mL/hr}) for this patient for the remainder of the first 8-hour post-injury period?

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Answer: 960

Answer

960
The correct infusion rate is 960 mL/hr960 \text{ mL/hr}. The Rule of Nines assigns 18% to the anterior torso, 9% to an entire arm, and 9% to the anterior surface of a leg, totaling 36% TBSA. Using the Parkland formula (4 mL×80 kg×36%4 \text{ mL} \times 80 \text{ kg} \times 36\%), the 24-hour requirement is 11,520 mL11,520 \text{ mL}. Half of this (5,760 mL5,760 \text{ mL}) must be given in the first 8 hours post-injury. Because the injury occurred 2 hours ago, the 5,760 mL5,760 \text{ mL} must be infused over the remaining 6 hours (5,760/6=960 mL/hr5,760 / 6 = 960 \text{ mL/hr}).

Step-by-Step Solution

1
Calculate the burned Total Body Surface Area (TBSA).
36%
Using the Rule of Nines: anterior torso (18%) + entire right arm (9%) + anterior right leg (9%) = 36%.
2
Calculate the total 24-hour resuscitation fluid volume.
11,520 mL
The traditional Parkland formula is 4 mL×weight (kg)×%TBSA4 \text{ mL} \times \text{weight (kg)} \times \%\text{TBSA}. For this patient: 4×80×36=11,520 mL4 \times 80 \times 36 = 11,520 \text{ mL}.
3
Determine the fluid volume required for the first 8 hours.
5,760 mL
Half (50%) of the total 24-hour calculated volume must be given in the first 8 hours post-injury. 11,520/2=5,760 mL11,520 / 2 = 5,760 \text{ mL}.
4
Calculate the hourly infusion rate for the remaining time.
960 mL/hr
The first 8-hour window begins at the time of injury, not time of arrival. Since 2 hours have elapsed, the 5,760 mL must be infused over the remaining 6 hours. 5,760/6=960 mL/hr5,760 / 6 = 960 \text{ mL/hr}.

Key Concept

Initial burn resuscitation requires accurately estimating TBSA using the Rule of Nines, calculating total fluid needs, and strictly administering the first half of the fluid over the first 8 hours measured from the TIME OF INJURY.
Question 907Question →

A 72-year-old man is evaluated in the emergency department for severe, sudden-onset abdominal pain that began 44 hours ago. His medical history is significant for a large anterior wall myocardial infarction 44 weeks ago, hypertension, and hyperlipidemia. He has not adhered to his prescribed medication regimen since discharge. The patient was initially writhing in agony, but over the past hour, he has become progressively lethargic. His temperature is 38.2∘C38.2^\circ\text{C} (100.8∘F100.8^\circ\text{F}), pulse is 135/min135/\text{min} and irregularly irregular, blood pressure is 78/50 mmHg78/50\text{ mmHg}, and respirations are 28/min28/\text{min}. Physical examination reveals a mottled appearance of the lower extremities. The abdomen is moderately distended and diffusely rigid, with marked involuntary guarding and rebound tenderness in all four quadrants. Bowel sounds are absent. Laboratory studies show:

Leukocyte count: 26,000/mm326,000/\text{mm}^3
Hemoglobin: 14.2 g/dL14.2\text{ g/dL}
Bicarbonate: 12 mEq/L12\text{ mEq/L}
Lactate: 7.8 mmol/L7.8\text{ mmol/L}

An electrocardiogram shows atrial fibrillation with a rapid ventricular response and deep Q waves in the anterior leads. Which of the following is the most appropriate next step in management?

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Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy is required due to the presence of peritonitis and hemodynamic instability in the setting of acute mesenteric ischemia.
The correct answer is immediate exploratory laparotomy. This patient's presentation of sudden-onset abdominal pain in the setting of atrial fibrillation and a recent anterior myocardial infarction is highly suspicious for acute mesenteric ischemia caused by a superior mesenteric artery embolus. While early mesenteric ischemia classically presents with 'pain out of proportion to physical exam findings,' this patient has progressed to transmural bowel infarction, resulting in a rigid abdomen, generalized peritonitis, and septic shock (hypotension, tachycardia, severe lactic acidosis). In any patient with suspected ischemic bowel, the development of peritonitis or hemodynamic instability mandates immediate exploratory laparotomy to resect the necrotic bowel and perform abdominal washout. Delaying surgery for imaging in this critical state is contraindicated.

Step-by-Step Solution

1
Identify the underlying diagnosis based on the clinical presentation and risk factors.
The patient has sudden, severe abdominal pain, a high lactate level, and major risk factors for an arterial embolus (recent anterior MI predisposing to left ventricular thrombus, and atrial fibrillation). This strongly points to acute mesenteric ischemia (AMI), likely a superior mesenteric artery (SMA) embolus.
Recognizing the etiology is crucial, but determining the disease stage dictates the immediate action.
2
Assess the patient's hemodynamic status and physical examination findings.
The patient is in shock (BP 78/50 mmHg, HR 135/min, lethargy, mottled extremities) and has frank peritonitis (rigid abdomen, involuntary guarding, rebound tenderness).
These findings indicate that the ischemia has progressed to transmural bowel infarction and perforation, leading to septic shock.
3
Determine the appropriate management pathway based on the clinical severity.
Although CT angiography is the standard diagnostic test for early AMI, the presence of peritonitis and hemodynamic instability is an absolute indication for immediate exploratory laparotomy.
Unstable patients with a surgical abdomen must go directly to the operating room; delaying for imaging or attempting conservative measures increases mortality.

Key Concept

Management algorithm for Acute Mesenteric Ischemia (AMI)
Question 908Question →

Match each patient's clinical presentation and physical examination findings to the underlying surgical pathology or pathophysiologic mechanism that best explains their condition.

Click a left item, then click its matching right item

Items

A 65-year-old male with a palpable, expansile periumbilical mass, sudden-onset severe back pain, and profound hypotension.
A 72-year-old female with a history of atrial fibrillation presenting with acute onset of a painful, pale, paresthetic, and pulseless right leg.
A 58-year-old male with reproducible cramping pain in the left calf that occurs after walking 200 meters and resolves promptly within a few minutes of rest.
A 48-year-old male with sudden-onset, severe, tearing chest pain radiating to the interscapular region and asymmetric radial pulses.

Matches

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Answer

Ruptured AAA matches with full-thickness aortic wall rupture; Acute limb ischemia matches with thromboembolism; Peripheral arterial disease matches with chronic atherosclerosis; Acute aortic dissection matches with an intimal tear creating a false lumen.
Each of these distinct clinical syndromes has a classic underlying pathophysiology. Recognizing the acute versus chronic nature of the symptoms, as well as specific risk factors (e.g., atrial fibrillation for embolism), allows for accurate correlation between the physical findings and the surgical pathology.

Step-by-Step Solution

1
Analyze the first clinical presentation (left_1).
Identified the classic triad of a ruptured abdominal aortic aneurysm (hypotension, back pain, pulsatile mass).
This corresponds to the full-thickness deterioration and rupture of the aortic wall (right_1).
2
Analyze the second clinical presentation (left_2).
Identified acute limb ischemia in the setting of atrial fibrillation.
This matches sudden occlusion of a peripheral artery by a dislodged thromboembolus (right_2).
3
Analyze the third clinical presentation (left_3).
Identified intermittent claudication.
This is caused by chronic atherosclerosis, which is progressive intimal lipid accumulation and calcification (right_3).
4
Analyze the fourth clinical presentation (left_4).
Identified an acute aortic dissection.
This is pathophysiologically defined by an intimal tear creating a false lumen within the aortic media (right_4).

Key Concept

Cardiothoracic and Vascular Surgery Clinical Presentations and Pathophysiology
Estimated Time:1m 30s
Question 909Question →

An 81-year-old man who resides in an assisted living facility is brought to the emergency department after 3 days of progressive abdominal swelling, obstipation, and bilious emesis. He has a medical history of severe Parkinson disease, hypertension, and chronic constipation. On arrival, his temperature is 38.8°C (101.8°F), blood pressure is 82/50 mmHg, pulse is 128/min, and respirations are 24/min. Physical examination reveals a markedly distended, tympanitic abdomen with diffuse rebound tenderness and involuntary guarding. Laboratory evaluation demonstrates a leukocyte count of 21,000/mm³ and a serum lactate level of 6.1 mmol/L. Following initial intravenous fluid resuscitation, a portable abdominal radiograph is acquired, demonstrating a massive, dilated, inverted U-shaped colonic loop arising from the pelvis and projecting toward the right upper quadrant. There is no pneumoperitoneum visible. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Immediate exploratory laparotomy

Answer

Immediate exploratory laparotomy is the most appropriate next step for a patient with a sigmoid volvulus who exhibits signs of bowel strangulation (peritonitis, hemodynamic instability, lactic acidosis).
The patient's clinical presentation is classic for a sigmoid volvulus, characterized by chronic constipation, massive distension, and an inverted U-shaped loop (coffee bean sign) on an abdominal radiograph. While uncomplicated sigmoid volvulus is typically managed first with flexible sigmoidoscopy and placement of a decompression tube, this approach is contraindicated if there is evidence of bowel compromise. This patient exhibits clear signs of bowel strangulation and ischemia, including fever, hemodynamic instability (hypotension, marked tachycardia), elevated serum lactate, and diffuse peritonitis (rebound tenderness, involuntary guarding). In this setting, the bowel is likely gangrenous or already micro-perforated. Attempting endoscopic decompression or further diagnostic imaging would delay life-saving treatment and increase the risk of massive fecal spillage. Therefore, the most appropriate next step is immediate exploratory laparotomy to resect the nonviable segment of the colon and achieve source control.

Step-by-Step Solution

1
Identify the primary diagnosis from the clinical presentation and imaging.
The patient's history of chronic constipation, abdominal distension, and the pathognomonic "inverted U-shaped colonic loop" (coffee bean sign) on radiograph indicate a sigmoid volvulus.
Establishing the underlying pathology is necessary to choose the specific treatment algorithm.
2
Assess the patient's severity and hemodynamic status.
The patient is hypotensive, tachycardic, febrile, and has an elevated lactate level with diffuse rebound tenderness and guarding (peritonitis).
The clinical stability and presence of peritonitis determine whether conservative/endoscopic management or emergent surgery is required.
3
Select the appropriate intervention based on the clinical severity.
Because peritonitis and hemodynamic instability indicate strangulated or gangrenous bowel, endoscopic decompression is contraindicated, and immediate open surgical exploration is necessary.
Resecting the necrotic bowel and achieving immediate source control is life-saving in this scenario.

Key Concept

Surgical management of complicated sigmoid volvulus
Question 910Question →

Match each clinical presentation of an acute abdomen to its most appropriate initial management or definitive surgical intervention.

Click a left item, then click its matching right item

Items

A 45-year-old female presents with right upper quadrant pain and fever (38.5°C). Physical exam shows focal tenderness that arrests inspiration upon deep palpation. Ultrasound demonstrates pericholecystic fluid and a thickened gallbladder wall.
A 22-year-old male presents with anorexia and periumbilical pain that later migrated to the right lower quadrant. His temperature is 38.0°C, and physical exam reveals marked rebound tenderness at McBurney's point.
A 60-year-old male presents with sudden onset, severe, and diffuse abdominal pain. He is hypotensive (90/60 mmHg) and tachycardic, with a rigid, board-like abdomen. Upright chest X-ray reveals free air under the right hemidiaphragm.
A 65-year-old female with a history of a total abdominal hysterectomy presents with crampy abdominal pain, bilious vomiting, and obstipation. She is hemodynamically stable without peritonitis. CT scan shows dilated loops of small bowel with a transition point.

Matches

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Answer

The clinical presentations match their standard management: acute cholecystitis with laparoscopic cholecystectomy, acute appendicitis with appendectomy, perforated viscus with emergent exploratory laparotomy, and uncomplicated small bowel obstruction with nasogastric decompression and intravenous fluids.
Each presentation describes a classic, textbook scenario of a common surgical condition. The paired intervention represents the gold-standard initial management step according to widely accepted surgical guidelines.

Step-by-Step Solution

1
Analyze each clinical presentation to diagnose the underlying acute abdominal pathology based on history, physical exam, and imaging.
The diagnoses are acute cholecystitis, acute appendicitis, perforated hollow viscus, and uncomplicated small bowel obstruction.
Accurate diagnosis is required to determine the appropriate standard-of-care intervention.
2
Match each diagnosed pathology with the appropriate surgical or medical intervention.
Cholecystitis requires cholecystectomy; appendicitis requires appendectomy; viscus perforation requires laparotomy; and uncomplicated small bowel obstruction requires initial nasogastric decompression.
This aligns the diagnosis with surgical guidelines for definitive intervention or conservative management.

Key Concept

Surgical management principles for common causes of an acute abdomen
Estimated Time:1m 0s
Question 911Question →

A 28-year-old carpenter is brought to the emergency department after accidentally severing his left index finger with an electric table saw 30 minutes ago. His blood pressure is 135/85 mmHg, heart rate is 98/min, and respiratory rate is 16/min. On physical examination, the patient is alert and cooperative. The proximal stump of the left index finger is cleanly amputated at the level of the proximal phalanx. Bleeding is effectively controlled with a sterile compressive dressing. The amputated digit has been brought to the hospital by his coworkers, currently resting on a dry, dirty cloth. Arrange the following steps in the most appropriate chronological order for the optimal preservation and transport of the amputated digit to a microsurgical replantation center.

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Answer

The correct chronological sequence is to first irrigate the digit with saline, then wrap it in saline-moistened gauze, seal it inside a watertight plastic bag, submerge the sealed bag in an ice-water slush, and finally transport the patient to a replantation center.
The viability of an amputated digit depends heavily on rapid and correct preservation. Warm ischemia time is poorly tolerated by musculoskeletal structures. By initiating cold ischemia, the metabolic rate drops, extending the viability window up to 12-24 hours for digits. The crucial principle is avoiding direct tissue damage. The digit must first be cleaned of gross debris using gentle saline irrigation. It is then wrapped in saline-moistened gauze to prevent desiccation. Next, it must be sealed in a watertight bag to prevent direct contact with water, which causes severe maceration and swelling, complicating microscopic vascular repair. Finally, the sealed bag is placed in an ice-water slush (never pure ice or dry ice), maintaining the temperature around 4°C without causing irreversible frostbite. Once appropriately preserved, immediate transport to a microsurgical facility is indicated.

Step-by-Step Solution

1
Irrigate the amputated part.
Gross contamination is removed with sterile saline.
Harsh chemicals or excessive scrubbing can destroy delicate neurovascular structures required for replantation.
2
Wrap the digit.
The digit is protected in saline-moistened sterile gauze.
Moist gauze maintains an optimal local environment, preventing the soft tissues from desiccating.
3
Seal in a bag.
The wrapped digit is placed in a watertight plastic bag.
This establishes a physical barrier to prevent direct exposure to ice and water, which causes tissue maceration.
4
Induce hypothermia.
The sealed bag is submerged in an ice-water slush.
Cold ischemia at approximately 4°C decreases cellular metabolic demand, significantly extending the viability window for the amputated part.
5
Transport.
The patient and the preserved digit are transferred.
Microsurgical replantation requires specialized surgical teams typically located at designated tertiary trauma centers.

Key Concept

The optimal preservation of an amputated digit involves wrapping it in saline-moistened gauze, sealing it in a watertight bag, and cooling it in an ice-water slush to maximize cold ischemia time while preventing maceration and frostbite.
Question 912Question →

Match each patient's clinical presentation of an acute surgical abdomen with the most appropriate next step in management.

Click a left item, then click its matching right item

Items

A 58-year-old male with a history of an appendectomy presents with intermittent crampy abdominal discomfort, bilious emesis, and failure to pass flatus. His abdomen is distended but soft, lacking guarding. Imaging confirms distended small intestinal loops without signs of strangulation.
A 68-year-old female with a history of irregular heart rhythm complains of agonizing generalized abdominal pain. Despite her distress, palpation of the abdomen elicits minimal tenderness. Hemodynamics are stable, and there is no rigidity.
A 49-year-old male arrives in immense distress holding his abdomen, following a sudden onset of severe epigastric pain. He is tachycardic, and palpation reveals board-like rigidity across all four quadrants. Erect plain film demonstrates free intraperitoneal gas.
A 39-year-old female complains of unrelenting pain under her right rib cage accompanied by a temperature of 38.3°C (100.9°F). Sonography confirms a thickened gallbladder wall, surrounding fluid, and stones, with no biliary duct dilation.
A 61-year-old male reports two days of localized left-sided lower abdominal aching and subjective fever. Vital signs are within normal limits, and he exhibits localized guarding without rebound tenderness. He is tolerating oral hydration well.

Matches

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Answer

The correct pairings are: the patient with distended loops and no guarding requires gastrointestinal decompression; the patient with atrial fibrillation and pain out of proportion requires contrast-enhanced vascular imaging; the patient with a rigid abdomen and free gas requires emergent operative exploration; the patient with a positive sonogram for cholecystitis requires early laparoscopic cholecystectomy; and the stable patient with localized left lower quadrant pain tolerating fluids requires outpatient management.
Appropriate triage of an acute abdomen relies on identifying peritonitis and differentiating uncomplicated from complicated disease processes. A rigid abdomen with free air unequivocally requires emergent operative repair. Pain out of proportion without peritonitis requires urgent vascular imaging to rule out mesenteric ischemia. Uncomplicated mechanical obstructions are initially managed with decompression and bowel rest. Inflammatory conditions like acute cholecystitis necessitate early surgical removal during the index admission, whereas mild, localized diverticulitis can often be managed outpatient.

Step-by-Step Solution

1
Assess hemodynamic stability and identify the presence of peritonitis in each clinical vignette.
The patient with board-like rigidity and free gas exhibits generalized peritonitis, which mandates emergent operative exploration.
The presence of peritonitis or hemodynamic instability in the acute abdomen triage pathway dictates immediate surgical intervention over further imaging.
2
Evaluate specific clinical cues that point to vascular etiologies versus mechanical obstructions.
Pain out of proportion to the physical exam in the patient with a dysrhythmia points to early acute mesenteric ischemia, requiring rapid vascular imaging, while the patient with a soft abdomen and distension has an uncomplicated obstruction needing conservative care.
Identifying early ischemia before bowel infarction occurs prevents the need for massive bowel resection, whereas unnecessary surgery for uncomplicated obstructions carries high morbidity.
3
Differentiate management strategies for localized inflammatory conditions based on severity.
The uncomplicated diverticulitis patient can be safely discharged home, while the acute cholecystitis patient requires admission and prompt surgical removal.
Surgical guidelines stratify the necessity of admission and surgical timing based on the specific organ involved, the patient's systemic inflammatory response, and their ability to tolerate oral intake.

Key Concept

Surgical triage and stepwise management of the acute abdomen based on the presence of peritonitis, vascular risk factors, and disease severity.
Estimated Time:2m 0s
Question 913Question →

A 34-year-old plumber weighing 80 kg is brought to the emergency department 30 minutes after a commercial water heater exploded at a job site. He is awake and in significant pain. Vital signs show a heart rate of 110/min, blood pressure of 130/85 mm Hg, and respiratory rate of 20/min. Physical examination reveals second- and third-degree thermal burns involving his entire anterior trunk, his entire right arm, and the anterior surface of his right leg. There is no facial involvement or singed nasal hairs. The remainder of his skin is unaffected. Using the Rule of Nines for adults, what is the estimated total body surface area (TBSA) percentage affected by these burns?

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Answer: 36

Answer

36
The patient has second- and third-degree burns which are appropriately included in TBSA calculations (superficial or first-degree burns are excluded). According to the adult Rule of Nines, the head is 9%, each entire arm is 9%, the anterior trunk is 18%, the posterior trunk is 18%, each entire leg is 18%, and the perineum is 1%. This patient has burns on the entire anterior trunk (18%), the entire right arm (9%), and the anterior surface of the right leg (9%, which is exactly half of the entire 18% leg). Summing these areas yields: 18+9+9=36%18 + 9 + 9 = 36\%.

Step-by-Step Solution

1
Identify the affected body regions requiring TBSA calculation.
Entire anterior trunk, entire right arm, and anterior surface of the right leg.
First-degree burns are excluded from TBSA calculations, but second- and third-degree burns must be mapped to determine fluid resuscitation needs.
2
Assign the appropriate percentage to each region using the adult Rule of Nines.
Anterior trunk = 18%, Entire right arm = 9%, Anterior surface of the right leg = 9%.
According to the standard adult Rule of Nines, the anterior trunk is 18%, an entire arm is 9%, and an entire leg is 18% (meaning the anterior surface alone is half, or 9%).
3
Sum the percentages to find the estimated TBSA.
18 + 9 + 9 = 36%.
The total sum provides the TBSA needed for triage and fluid calculation formulas.

Key Concept

Estimating Total Body Surface Area (TBSA) in burn patients using the adult Rule of Nines.
Question 914Question →

An industrial worker is rushed to the trauma bay after a forklift accident caused a direct crush injury to his left shin. The primary trauma survey is completed, and his airway, breathing, and circulation are stable. The secondary survey reveals an obvious gross deformity of the left tibia with a 5-centimeter anterior laceration. Fractured bone segments are protruding through the skin, and the wound is heavily contaminated with grease and debris. Arrange the following acute management steps for this patient's extremity injury in the most appropriate chronological sequence, from first to last.

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Answer

The correct chronological sequence is: Assess distal neurovascular status, administer intravenous antibiotics and tetanus prophylaxis, apply a sterile dressing, perform provisional realignment and splinting, and finally obtain plain radiographs.
The standardized protocol for open fracture management in the emergency setting is designed to prevent limb-threatening complications. After the primary ATLS survey, a neurovascular exam is the vital first step to establish a baseline. Because infection is the most severe complication of open fractures, administering intravenous antibiotics and tetanus prophylaxis follows immediately. Next, the exposed wound is covered with a sterile dressing to prevent nosocomial contamination. Only after the wound is protected should the provider gently realign and splint the extremity to prevent further soft tissue damage. Finally, once the limb is safely immobilized, the patient can undergo radiographic imaging without the risk of shifting bone fragments causing secondary neurovascular injury.

Step-by-Step Solution

1
Prioritize initial extremity evaluation.
Perform a baseline neurovascular exam.
Any subsequent manipulation of the limb can alter neurological or vascular status; a baseline is required immediately after the primary survey.
2
Address infection control systemically.
Administer IV antibiotics and tetanus prophylaxis.
Time to antibiotic administration is directly correlated with infection rates in open fractures. It is the highest-yield medical intervention and must occur without delay.
3
Address infection control locally.
Apply a sterile, saline-soaked dressing.
The wound must be protected from hospital flora and further debris before any mechanical manipulation begins.
4
Mechanically stabilize the limb.
Realign the fracture and apply a temporary splint.
Splinting decreases pain, limits blood loss, and prevents further sharp bony trauma to adjacent nerves and vessels during patient movement.
5
Define the anatomy for definitive surgical planning.
Obtain orthogonal plain radiographs.
Imaging is crucial for planning the operative debridement and fixation, but the limb must be safely splinted before it is moved or positioned by radiological technologists.

Key Concept

Acute management of open fractures follows a strict sequence emphasizing early neurovascular assessment, immediate infection prophylaxis, wound protection, mechanical stabilization, and subsequent radiographic evaluation.
Estimated Time:1m 0s
Question 915Question →

A 28-year-old unrestrained driver is extricated from a crushed vehicle after a prolonged entrapment. On arrival at the trauma center, his systolic blood pressure is 65 mm Hg, heart rate is 142/min, and core temperature is 34.0°C (93.2°F). Focused assessment with sonography in trauma (FAST) demonstrates massive intraperitoneal free fluid. Initial arterial blood gas analysis reveals a pH of 7.12, and coagulation studies show an international normalized ratio (INR) of 1.9. Arrange the following management steps in the most appropriate chronological sequence according to established damage control principles for this patient.

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Answer

The correct sequence begins with immediate airway security and 1:1:1 balanced resuscitation, followed by an abbreviated damage control laparotomy. The abdomen is then temporarily closed to expedite ICU transfer, where the lethal triad is medically corrected. Finally, the patient returns for definitive surgical repair.
The damage control sequence is designed to prioritize physiologic survival over anatomic repair. The patient presents with the 'lethal triad' (hypothermia, acidosis, coagulopathy). The correct sequence dictates immediate airway control and hemostatic resuscitation (1:1:1 blood products), followed by a rapidly abbreviated Phase I operation to stop active bleeding and contamination. Because the patient cannot survive prolonged anesthesia, the abdomen is left open with a temporary closure to allow immediate transfer to the intensive care unit (Phase II). In the ICU, active rewarming and physiologic restoration occur. Only after the lethal triad is completely reversed (usually 24-48 hours later) does the patient undergo Phase III, returning to the operating room for definitive anatomic repairs.

Step-by-Step Solution

1
Recognize the presence of the lethal triad and profound shock.
Identify that the patient has hypothermia (34.0°C), acidosis (pH 7.12), and coagulopathy (INR 1.9), which strictly contraindicates prolonged surgery.
Recognizing physiologic exhaustion dictates the shift from standard surgical care to a damage control paradigm.
2
Secure airway and resuscitate.
Endotracheal intubation and 1:1:1 blood product administration.
Immediate life threats must be managed first (ATLS ABCs), and balanced resuscitation prevents the worsening of dilutional coagulopathy.
3
Perform abbreviated surgery (Phase I).
Exploratory celiotomy for hemorrhage and contamination control.
The patient is too unstable for prolonged surgery; the goal is solely to stop bleeding and limit spillage.
4
Conclude the initial operation rapidly.
Application of a temporary abdominal closure.
Primary fascial closure takes time and severely increases the risk of abdominal compartment syndrome in a patient receiving massive fluid/blood shifts.
5
Restore normal physiology (Phase II).
ICU rewarming and correction of acidosis/coagulopathy.
The lethal triad cannot be fully corrected in the operating room; critical care resuscitation is mandatory before further surgical trauma.
6
Definitive surgical repair (Phase III).
Return to the OR for bowel anastomosis and fascial closure.
Once physiologically stable, the patient can finally tolerate the stress of definitive reconstruction.

Key Concept

Damage Control Resuscitation and Surgery Paradigm
Question 916Question →

A 29-year-old male utility worker is brought to the emergency department after sustaining a high-voltage electrical injury while working on a power line. The injury occurred exactly 3 hours ago. On presentation, he has full-thickness burns involving his entire anterior trunk, entire right arm, entire left arm, and the anterior surface of his right leg. The remainder of his skin is uninjured. He weighs 90 kg. During transport, emergency medical services established intravenous access and administered 1,100 mL of lactated Ringer solution. According to the Advanced Trauma Life Support (ATLS) guidelines for electrical burns, what should be the intravenous fluid infusion rate (in mL/hr) for the remainder of the first 8-hour resuscitation period?

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Answer: 1400

Answer

1400
The correct infusion rate is 1,400 mL/hr. Using the Rule of Nines, the TBSA is 45% (anterior trunk 18%, right arm 9%, left arm 9%, anterior right leg 9%). For high-voltage electrical burns, the ATLS fluid resuscitation formula is 4 mL * kg * %TBSA. The total 24-hour requirement is 4 * 90 * 45 = 16,200 mL. Half of this (8,100 mL) must be given in the first 8 hours from the time of injury. Since 3 hours have passed, there are 5 hours remaining in this window. The patient already received 1,100 mL from EMS, leaving a required volume of 7,000 mL (8,100 - 1,100). Dividing 7,000 mL by the remaining 5 hours yields 1,400 mL/hr.

Step-by-Step Solution

1
Calculate the Total Body Surface Area (TBSA) affected by the burn.
18% + 9% + 9% + 9% = 45% TBSA.
The Rule of Nines is used to estimate the extent of burns to accurately calculate fluid requirements.
2
Calculate the total 24-hour fluid resuscitation requirement.
4 mL * 90 kg * 45% = 16,200 mL.
ATLS guidelines mandate 4 mL/kg/%TBSA for high-voltage electrical burns (unlike the 2 mL/kg/%TBSA standard for adult thermal burns) to prevent pigment-induced nephropathy from myoglobinuria.
3
Determine the fluid target for the first 8 hours post-injury.
16,200 mL / 2 = 8,100 mL.
Half of the total 24-hour fluid requirement must be given in the first 8 hours from the time of the injury.
4
Calculate the remaining fluid needed for the first 8-hour window.
8,100 mL - 1,100 mL = 7,000 mL.
The patient already received 1,100 mL from EMS, which must be subtracted from the first 8-hour target to avoid fluid overload.
5
Calculate the infusion rate for the remaining time.
7,000 mL / 5 hours = 1,400 mL/hr.
The injury occurred 3 hours ago, leaving 5 hours in the first 8-hour window. The remaining volume is divided by the remaining time.

Key Concept

Fluid resuscitation in electrical burns requires 4 mL/kg/%TBSA, with half administered in the first 8 hours from the time of injury, accounting for any pre-hospital fluid given and elapsed time.
Question 917Question →

A physician is called to review a patient who has suddenly become short of breath. The patient is a 73-year-old retired teacher who underwent an open radical cystectomy and formation of an ileal conduit three days ago for urothelial carcinoma. His past medical records indicate a long history of tobacco use with associated chronic bronchitis, as well as a prior myocardial infarction. During the surgery, he received substantial crystalloid resuscitation due to significant blood loss. Current vital signs include a temperature of 38.5°C (101.3°F), a heart rate of 122/min, a blood pressure of 158/92 mm Hg, and a respiratory rate of 28 breaths per minute. Pulse oximetry indicates an oxygen saturation of 87% on room air. Clinical examination highlights elevated neck veins and a positive hepatojugular reflux. Lung auscultation demonstrates bilateral expiratory wheezes and dependent fine crackles. The surgical incision shows no signs of erythema or discharge, and the ostomy is viable with clear urine output. Which of the following is the most appropriate next step in the management of this patient?

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Answer: Delivery of an intravenous loop diuretic agent

Answer

The most appropriate next step is the administration of an intravenous loop diuretic agent to manage acute decompensated heart failure.
The correct intervention is the administration of an intravenous loop diuretic. This patient is experiencing acute decompensated heart failure (ADHF). During major abdominal surgeries, patients often receive large volumes of crystalloid fluids, which initially third-space into the extravascular compartment. Typically around postoperative day 3, capillary permeability normalizes, and this third-spaced fluid rapidly mobilizes back into the intravascular space. In patients with underlying cardiac dysfunction (such as this patient's prior myocardial infarction), this sudden increase in venous return overwhelms the left ventricle, leading to cardiogenic pulmonary edema. The diagnosis is confirmed clinically by the presence of elevated jugular venous pressure, positive hepatojugular reflux, and bilateral basilar crackles. The wheezing represents 'cardiac asthma,' which occurs when fluid accumulates in the peribronchial spaces, causing airway narrowing. Intravenous loop diuretics provide rapid preload reduction and are the cornerstone of initial therapy.

Step-by-Step Solution

1
Analyze the patient's vital signs and physical examination findings.
The patient has hypoxia, tachypnea, elevated neck veins, hepatojugular reflux, wheezing, and bilateral fine crackles.
These specific signs strongly indicate hydrostatic pulmonary edema and right-sided volume overload (acute decompensated heart failure).
2
Correlate the physical findings with the postoperative timeline and surgical history.
The patient is on postoperative day 3 following a major surgery with significant intraoperative fluid resuscitation.
Fluids third-spaced during surgery typically mobilize back into the intravascular space around day 3, precipitating fluid overload in patients with reduced cardiac reserve (prior myocardial infarction).
3
Evaluate the significance of the fever and wheezing.
The low-grade fever is likely a physiological postoperative response or due to concurrent atelectasis, while the wheezing represents 'cardiac asthma' from peribronchial edema.
Recognizing that these findings do not override the clear hemodynamic evidence of heart failure prevents misdiagnosis of pneumonia or COPD exacerbation.
4
Determine the most appropriate initial management.
Intravenous loop diuretics (e.g., furosemide, bumetanide) should be administered immediately.
Preload reduction is the primary life-saving intervention for acute cardiogenic pulmonary edema.

Key Concept

Diagnosis and management of postoperative acute decompensated heart failure due to third-space fluid mobilization.
Estimated Time:2m 0s
Question 918Question →

Twelve days ago, a 72-year-old man underwent an emergency exploratory laparotomy with bowel resection for acute mesenteric ischemia. He remains in the intensive care unit on mechanical ventilation and receives total parenteral nutrition. Over the past 24 hours, his body temperature has increased to 39.2∘C39.2^\circ\text{C} (102.6∘F102.6^\circ\text{F}). His blood pressure is 92/62 mmHg92/62\text{ mmHg} and his pulse is 116/min116/\text{min}. The abdominal incision is clean and intact. Physical examination reveals localized guarding in the right upper abdominal quadrant when palpated. Laboratory results demonstrate a leukocyte count of 19,500/mm319,500/\text{mm}^3, total bilirubin of 2.9 mg/dL2.9\text{ mg/dL}, and alkaline phosphatase of 350 U/L350\text{ U/L}. A bedside abdominal ultrasound shows a gallbladder wall thickness of 6 mm6\text{ mm}, pericholecystic fluid, and no visible gallstones or biliary ductal dilation. Which of the following is the most appropriate next step in management?

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Answer: Placement of a percutaneous cholecystostomy tube

Answer

The most appropriate next step is the placement of a percutaneous cholecystostomy tube to decompress the infected gallbladder in this critically ill patient.
This patient has acute acalculous cholecystitis, an inflammatory condition of the gallbladder seen in critically ill patients (e.g., sepsis, major trauma, mechanical ventilation, prolonged total parenteral nutrition). The pathogenesis involves gallbladder stasis and ischemia, leading to inflammation and secondary bacterial infection. The diagnosis is confirmed by ultrasound demonstrating a thickened gallbladder wall, pericholecystic fluid, and absence of gallstones. While cholecystectomy is the definitive treatment, critically ill patients are often too unstable to tolerate surgery. Therefore, the standard of care is broad-spectrum intravenous antibiotics combined with the placement of a percutaneous cholecystostomy tube for immediate gallbladder decompression and source control.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and risk factors.
The patient is critically ill, mechanically ventilated, and receiving total parenteral nutrition (TPN), which are major risk factors for acute acalculous cholecystitis due to gallbladder stasis and ischemia.
Identifying the risk profile narrows down the differential diagnosis for a new-onset fever in the intensive care unit.
2
Interpret the diagnostic findings.
Ultrasound reveals gallbladder wall thickening (>4 mm>4\text{ mm}) and pericholecystic fluid without stones or biliary dilation, confirming acute acalculous cholecystitis.
Correlating physical signs (right upper quadrant guarding) with imaging establishes a definitive diagnosis.
3
Determine the optimal management strategy based on patient stability.
Because the patient is hemodynamically unstable (92/62 mmHg92/62\text{ mmHg}) and critically ill, surgical intervention is too high risk, making percutaneous drainage the treatment of choice.
Management must balance the need for source control against the patient's ability to tolerate physiological stress.

Key Concept

Acute acalculous cholecystitis typically occurs in critically ill patients (e.g., trauma, mechanical ventilation, TPN) and is initially managed with broad-spectrum antibiotics and percutaneous cholecystostomy tube placement due to high surgical risk.
Estimated Time:1m 15s
Question 919Question →

A 42-year-old male construction worker is evaluated in the trauma center after a 15-foot fall from scaffolding. On arrival, his blood pressure is 75/40 mmHg75/40 \text{ mmHg} and heart rate is 132 /min132 \text{ /min}. His airway is patent, and breath sounds are present and equal bilaterally. A chest radiograph shows no abnormalities. The abdomen is soft and non-distended without guarding or rigidity. A focused assessment with sonography for trauma (FAST) reveals no free intraperitoneal or pericardial fluid. Gentle compression of the iliac crests reveals mechanical instability and crepitus. Which of the following is the most appropriate next step in management?

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Answer: Application of a pelvic binder

Answer

Application of a pelvic binder
This patient is in hemorrhagic shock secondary to a pelvic fracture. The negative chest radiograph and negative FAST exam localize the life-threatening hemorrhage to the retroperitoneal space due to the mechanically unstable pelvic ring. The venous plexus and cancellous bone are the most common sources of bleeding in pelvic fractures. The immediate next step is the application of a pelvic binder (or sheet), which mechanically stabilizes the fracture, reduces pelvic volume, and promotes the tamponade of venous hemorrhage. Once the binder is applied and the patient receives balanced blood product resuscitation, further steps (such as pelvic angiography for arterial bleeding or preperitoneal packing) can be pursued if hemodynamic instability persists.

Step-by-Step Solution

1
Identify the patient's hemodynamic status.
The patient is in hemorrhagic shock (blood pressure 75/40 mmHg75/40 \text{ mmHg}, heart rate 132 /min132 \text{ /min}).
Vital signs dictate the immediate treatment pathway in trauma algorithms.
2
Localize the source of hemorrhage.
The chest radiograph is normal, and FAST is negative, ruling out massive hemothorax or intraperitoneal bleeding. Pelvic instability indicates a pelvic ring fracture.
Trauma evaluation systematically rules out sources of life-threatening bleeding (chest, abdomen, pelvis, long bones).
3
Determine the appropriate intervention for the identified bleeding source.
The patient requires immediate pelvic stabilization.
A pelvic binder reduces pelvic volume, promoting tamponade of venous bleeding, which is the most common source of hemorrhage in pelvic fractures.

Key Concept

Hemodynamically unstable patients with suspected pelvic fractures and a negative FAST exam should immediately undergo application of a pelvic binder to promote venous tamponade and reduce retroperitoneal hemorrhage.
Question 920Question →

A 28-year-old man is brought to the emergency department by paramedics after a high-speed motorcycle collision. On arrival, he is in severe respiratory distress and appears pale and diaphoretic. Vital signs are temperature 36.5°C (97.7°F), blood pressure 75/40 mm Hg, pulse 138/min, and respirations 32/min. Physical examination reveals rightward tracheal deviation. The left hemithorax is dull to percussion with absent breath sounds. Intravenous access is established, and a bolus of warmed crystalloid is initiated. A tube thoracostomy is placed in the left fifth intercostal space, which immediately returns 1,600 mL of bright red blood. Over the next 5 minutes, an additional 250 mL of blood drains into the collection unit. A repeat blood pressure is 68/35 mm Hg. Which of the following is the most appropriate next step in management?

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Answer: Emergent thoracotomy

Answer

Emergent thoracotomy is required due to the massive initial blood output (>1,500 mL) indicating major intrathoracic injury.
The correct answer is emergent thoracotomy. This patient presents with a massive hemothorax following blunt thoracic trauma, complicated by severe hemorrhagic shock. A tube thoracostomy is the most appropriate initial step to evacuate the pleural space, re-expand the lung, and quantify the bleeding. However, the immediate evacuation of >1,500 mL of blood (or ongoing hemorrhage of >200 mL/hr for 2 to 4 hours) is a standard absolute indication for an emergent thoracotomy. Such massive bleeding typically originates from systemic vessels or major hilar structures, which require direct surgical hemostasis in the operating room to prevent exsanguination.

Step-by-Step Solution

1
Analyze the patient's presentation and the result of the initial intervention.
The patient is in hemorrhagic shock with a massive left hemothorax, confirmed by the immediate evacuation of 1,600 mL of bright red blood via tube thoracostomy.
Tracheal deviation, dullness to percussion, and absent breath sounds followed by massive blood return establish the diagnosis of a massive hemothorax.
2
Evaluate the indications for urgent surgical intervention.
Immediate return of >1,500 mL of blood is an absolute indication for emergent thoracotomy.
This high volume of acute bleeding typically indicates injury to systemic vessels (e.g., intercostal arteries, internal mammary arteries) or major hilar structures that require direct surgical hemostasis.
3
Assess the patient's hemodynamic stability to rule out imaging or conservative management.
The patient remains in profound shock (blood pressure 68/35 mm Hg) despite initial fluid resuscitation and chest tube placement.
Hemodynamically unstable patients must proceed directly to the operating room; transporting them for cross-sectional imaging (CT) is contraindicated.

Key Concept

Indications for emergent thoracotomy in blunt or penetrating thoracic trauma include initial chest tube drainage of greater than 1,500 mL of blood, or ongoing hemorrhage of greater than 200 mL/hr for 2 to 4 consecutive hours.
Estimated Time:1m 0s
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