Resuscitative thoracotomy — MCQs

10 questions

A 28-year-old woman is brought to the emergency department 1 hour after being involved in a motor vehicle collision. She was riding a bike when she lost control and hit a car on the opposite side of the road. On arrival, she is unconscious. She has a history of intravenous heroin use. Her pulse is 56/min, respirations are 8/min and irregular, and blood pressure is 196/102 mm Hg. Examination shows a 2-cm laceration over the left cheek and a 3-cm laceration over the left chest. There are multiple abrasions over her face and chest. She opens her eyes and flexes her extremities to painful stimuli. The pupils are dilated and react sluggishly to light. There are decreased breath sounds over the left lung. The trachea is central. There is no jugular venous distention. Cardiac examination shows no abnormalities. The abdomen is soft and nontender. The left knee and right ankle are swollen; range of motion is limited. Two large-bore peripheral intravenous catheters are inserted. She is intubated and mechanical ventilation is initiated. A focused assessment with sonography in trauma is negative. An occlusive dressing is applied over the left chest wound. She is scheduled for a noncontrast CT scan of the brain. Which of the following is the underlying cause of this patient's hypertension?

A 56-year-old man is brought to the emergency department after falling 16 feet from a ladder. He has severe pain in both his legs and his right arm. He appears pale and diaphoretic. His temperature is 37.5°C (99.5°F), pulse is 120/min and weak, respirations are 26/min, and blood pressure is 80/50 mm Hg. He opens his eyes and withdraws in response to painful stimuli and makes incomprehensible sounds. The abdomen is soft and nontender. All extremities are cold, with 1+ pulses distally. Arterial blood gas analysis on room air shows: pH 7.29 PCO2 33 mm Hg PO2 65 mm Hg HCO3- 15 mEq/L A CT scan shows displaced fractures of the pelvic ring, as well as fractures of both tibiae, the right distal radius, and right proximal humerus. The patient undergoes emergent open reduction and is admitted to the intensive care unit. Which of the following best indicates inadequate fluid resuscitation?

A 35-year-old woman is brought to the emergency department 45 minutes after being rescued from a house fire. On arrival, she appears confused and has shortness of breath. The patient is 165 cm (5 ft 5 in) tall and weighs 55 kg (121 lb); BMI is 20 kg/m2. Her pulse is 125/min, respirations are 29/min, and blood pressure is 105/65 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 97%. Examination shows second and third-degree burns over the anterior surfaces of the chest and abdomen, and the anterior surface of the upper extremities. There is black debris in the mouth and nose. There are coarse breath sounds over the lung bases. Cardiac examination shows no murmurs, rubs, or gallop. Femoral and pedal pulses are palpable bilaterally. Which of the following is the most appropriate fluid regimen for this patient according to the Parkland formula?

A 27-year-old soldier stationed in Libya sustains a shrapnel injury during an attack, causing a traumatic above-elbow amputation. The resulting arterial bleed is managed with a tourniquet prior to transport to the military treatment facility. On arrival, he is alert and oriented to person, place, and time. His armor and clothing are removed. His pulse is 145/min, respirations are 28/min, and blood pressure is 95/52 mm Hg. Pulmonary examination shows symmetric chest rise. The lungs are clear to auscultation. Abdominal examination shows no abnormalities. There are multiple shrapnel wounds over the upper and lower extremities. A tourniquet is in place around the right upper extremity; the right proximal forearm has been amputated. One large-bore intravenous catheter is placed in the left antecubital fossa. Despite multiple attempts, medical staff is unable to establish additional intravenous access. Which of the following is the most appropriate next step in management?

A 35-year-old man is brought to the emergency department from a kitchen fire. The patient was cooking when boiling oil splashed on his exposed skin. His temperature is 99.7°F (37.6°C), blood pressure is 127/82 mmHg, pulse is 120/min, respirations are 12/min, and oxygen saturation is 98% on room air. He has dry, nontender, and circumferential burns over his arms bilaterally, burns over the anterior portion of his chest and abdomen, and tender spot burns with blisters on his shins. A 1L bolus of normal saline is administered and the patient is given morphine and his pulse is subsequently 80/min. A Foley catheter is placed which drains 10 mL of urine. What is the best next step in management?

A 45-year-old male is brought into the emergency room by emergency medical services due to a stab wound in the chest. The wound is located superior and medial to the left nipple. Upon entry, the patient appears alert and is conversational, but soon becomes confused and loses consciousness. The patient's blood pressure is 80/40 mmHg, pulse 110/min, respirations 26/min, and temperature 97.0 deg F (36.1 deg C). On exam, the patient has distended neck veins with distant heart sounds. What is the next best step to increase this patient's survival?

A 28-year-old woman is brought to the emergency department 30 minutes after being involved in a high-speed motor vehicle collision in which she was the unrestrained driver. On arrival, she is semiconscious and incoherent. She has shortness of breath and is cyanotic. Her pulse is 112/min, respirations are 59/min, and blood pressure is 128/89 mm Hg. Examination shows a 3-cm (1.2-in) laceration on the forehead and multiple abrasions over the thorax and abdomen. There is crepitation on palpation of the thorax on the right. Auscultation of the lung shows decreased breath sounds on the right side. A crunching sound synchronous with the heartbeat is heard best over the precordium. There is dullness on percussion of the right hemithorax. The lips and tongue have a bluish discoloration. There is an open femur fracture on the left. The remainder of the examination shows no abnormalities. Arterial blood gas analysis on room air shows: pH 7.31 PCO2 55 mm Hg PO2 42 mm Hg HCO3- 22 mEq/L O2 saturation 76% The patient is intubated and mechanically ventilated. Infusion of 0.9% saline is begun. Which of the following is the most likely diagnosis?

A 59-year-old man is brought to the emergency department by paramedics following a high-speed motor vehicle collision. The patient complains of excruciating chest pain, which he describes as tearing. Further history reveals that the patient is healthy, taking no medications, and is not under the influence of drugs or alcohol. On physical examination, his heart rate is 97/min. His blood pressure is 95/40 mm Hg in the right arm and 60/30 mm Hg in the left arm. Pulses are absent in the right leg and diminished in the left. A neurological examination is normal. A chest X-ray reveals a widened mediastinum. Which of the following is the most likely etiology of this patient's condition?

A 60-year-old man is brought to the emergency department 25 minutes after falling and hitting his left flank on a concrete block. He has severe left-sided chest pain and mild shortness of breath. He underwent a right knee replacement surgery 2 years ago. He has type 2 diabetes mellitus. He has smoked one pack of cigarettes daily for 42 years. Current medications include metformin, sitagliptin, and a multivitamin. He appears uncomfortable. His temperature is 37.5°C (99.5°F), pulse is 102/min, respirations are 17/min, and blood pressure is 132/90 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 96%. Examination shows multiple abrasions on his left flank and trunk. The upper left chest wall is tender to palpation and bony crepitus is present. There are decreased breath sounds over both lung bases. Cardiac examination shows no murmurs, rubs, or gallops. The abdomen is soft and nontender. Focused assessment with sonography for trauma is negative. An x-ray of the chest shows nondisplaced fractures of the left 4th and 5th ribs, with clear lung fields bilaterally. Which of the following is the most appropriate next step in management?

Q10

A 32-year-old man is brought to the emergency department 15 minutes after falling 7 feet onto a flat-top wooden post. On arrival, he is in severe pain and breathing rapidly. His pulse is 135/min, respirations are 30/min, and blood pressure is 80/40 mm Hg. There is an impact wound in the left fourth intercostal space at the midaxillary line. Auscultation shows tracheal deviation to the right and absent breath sounds over the left lung. There is dullness to percussion over the left chest. Neck veins are flat. Cardiac examination shows no abnormalities. Two large-bore intravenous catheters are placed and intravenous fluid resuscitation is begun. Which of the following is the most likely diagnosis?

Resuscitative thoracotomy US Medical PG Practice Questions and MCQs

Question 1: A 28-year-old woman is brought to the emergency department 1 hour after being involved in a motor vehicle collision. She was riding a bike when she lost control and hit a car on the opposite side of the road. On arrival, she is unconscious. She has a history of intravenous heroin use. Her pulse is 56/min, respirations are 8/min and irregular, and blood pressure is 196/102 mm Hg. Examination shows a 2-cm laceration over the left cheek and a 3-cm laceration over the left chest. There are multiple abrasions over her face and chest. She opens her eyes and flexes her extremities to painful stimuli. The pupils are dilated and react sluggishly to light. There are decreased breath sounds over the left lung. The trachea is central. There is no jugular venous distention. Cardiac examination shows no abnormalities. The abdomen is soft and nontender. The left knee and right ankle are swollen; range of motion is limited. Two large-bore peripheral intravenous catheters are inserted. She is intubated and mechanical ventilation is initiated. A focused assessment with sonography in trauma is negative. An occlusive dressing is applied over the left chest wound. She is scheduled for a noncontrast CT scan of the brain. Which of the following is the underlying cause of this patient's hypertension?

A. Elevated sympathetic response
B. Increased intrathoracic pressure
C. Reduced parasympathetic response
D. Posttraumatic vasospasm
E. Brainstem compression (Correct Answer)

Explanation: ***Brainstem compression*** - The patient's presentation with **hypertension**, **bradycardia**, and **irregular respirations** (Cushing's triad) in the setting of severe head trauma is highly indicative of **increased intracranial pressure (ICP)** leading to brainstem compression. - Brainstem compression, often due to a mass effect from hemorrhage or edema, impairs the brainstem's ability to regulate vital functions, resulting in this classic triad. *Elevated sympathetic response* - While trauma typically triggers an **elevated sympathetic response** leading to tachycardia and hypertension, the presence of **bradycardia** in this patient makes a purely sympathetic surge less likely to be the underlying cause of her hypertension. - The elevated blood pressure combined with a low heart rate points away from an unopposed sympathetic activation. *Increased intrathoracic pressure* - An increase in intrathoracic pressure, as seen in conditions like **tension pneumothorax**, can impair venous return and cardiac output, typically leading to **hypotension**, not hypertension. - Although the patient has decreased breath sounds on the left, an occlusive dressing was applied, and a FAST exam was negative for significant fluid, making this less likely the cause of hypertension. *Reduced parasympathetic response* - A reduced parasympathetic response would generally lead to **tachycardia** rather than bradycardia, as the vagal tone would be diminished. - The observed bradycardia, therefore, contradicts a primary issue of reduced parasympathetic activity. *Posttraumatic vasospasm* - **Posttraumatic vasospasm** can occur after severe brain injury, but it typically does not directly manifest as immediate, severe hypertension accompanied by bradycardia and respiratory irregularities (Cushing's triad). - Vasospasm usually contributes to cerebral ischemia and can develop hours to days after the initial injury, not typically as the acute cause of these profound vital sign changes.

Question 2: A 56-year-old man is brought to the emergency department after falling 16 feet from a ladder. He has severe pain in both his legs and his right arm. He appears pale and diaphoretic. His temperature is 37.5°C (99.5°F), pulse is 120/min and weak, respirations are 26/min, and blood pressure is 80/50 mm Hg. He opens his eyes and withdraws in response to painful stimuli and makes incomprehensible sounds. The abdomen is soft and nontender. All extremities are cold, with 1+ pulses distally. Arterial blood gas analysis on room air shows: pH 7.29 PCO2 33 mm Hg PO2 65 mm Hg HCO3- 15 mEq/L A CT scan shows displaced fractures of the pelvic ring, as well as fractures of both tibiae, the right distal radius, and right proximal humerus. The patient undergoes emergent open reduction and is admitted to the intensive care unit. Which of the following best indicates inadequate fluid resuscitation?

A. Urine output of 25 mL in 3 hours (Correct Answer)
B. Capillary refill time of 3 seconds
C. Base deficit of 1 mmol/L
D. Glasgow coma score of 8
E. High pulse pressure

Explanation: ***Urine output of 25 mL in 3 hours*** - A critically low urine output of **less than 0.5 mL/kg/hr** (or <30 mL/hr in an adult) over several hours is a direct and sensitive indicator of **renal hypoperfusion** due to inadequate fluid resuscitation, especially in the context of traumatic shock. - Oliguria suggests that the kidneys are not receiving sufficient blood flow to maintain normal function, indicating persistent systemic hypovolemia despite initial interventions. *Capillary refill time of 3 seconds* - A capillary refill time of 3 seconds, while slightly prolonged (normal <2 seconds), is less definitive for **severe ongoing hypovolemia** compared to oliguria. - It can be influenced by factors like **ambient temperature** and peripheral vasoconstriction, which are common in trauma but may not solely reflect inadequate fluid volume. *Base deficit of 1 mmol/L* - A base deficit of 1 mmol/L is essentially **within the normal range** (typically -2 to +2 mmol/L). - A normal or low base deficit suggests that **tissue perfusion is adequate** and there's no significant ongoing metabolic acidosis due to anaerobic metabolism, making it an indicator of *adequate* rather than *inadequate* resuscitation. *Glasgow coma score of 8* - A Glasgow Coma Scale (GCS) score of 8 (Eyes: 2, Verbal: 2, Motor: 4 from the stem) indicates **moderate head injury** or altered mental status. - While hypovolemic shock can affect mentation, a GCS of 8 is more indicative of **neurological damage** (e.g., from head trauma sustained in the fall) or other systemic issues rather than being a primary measure of fluid resuscitation status. *High pulse pressure* - A high pulse pressure (the difference between systolic and diastolic blood pressure) is typically seen in conditions like **sepsis** or **aortic regurgitation**. - In a patient with hypovolemic shock, **pulse pressure is usually narrowed** due to increased peripheral vascular resistance and decreased stroke volume.

Question 3: A 35-year-old woman is brought to the emergency department 45 minutes after being rescued from a house fire. On arrival, she appears confused and has shortness of breath. The patient is 165 cm (5 ft 5 in) tall and weighs 55 kg (121 lb); BMI is 20 kg/m2. Her pulse is 125/min, respirations are 29/min, and blood pressure is 105/65 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 97%. Examination shows second and third-degree burns over the anterior surfaces of the chest and abdomen, and the anterior surface of the upper extremities. There is black debris in the mouth and nose. There are coarse breath sounds over the lung bases. Cardiac examination shows no murmurs, rubs, or gallop. Femoral and pedal pulses are palpable bilaterally. Which of the following is the most appropriate fluid regimen for this patient according to the Parkland formula?

A. Administer 4 liters of intravenous colloids over the next 8 hours
B. Administer 5 liters of intravenous colloids over the next 6 hours
C. Administer 5 liters of intravenous crystalloids over the next 6 hours
D. Administer 8 liters of intravenous colloids over the next 12 hours
E. Administer 6 liters of intravenous crystalloids over the next 24 hours (Correct Answer)

Explanation: ***Administer 6 liters of intravenous crystalloids over the next 24 hours*** - The **Parkland formula** is 4 mL × weight (kg) × %TBSA burn. The patient's weight is 55 kg. The burns cover the anterior chest (9%), anterior abdomen (9%), and anterior surfaces of both upper extremities (4.5% + 4.5% = 9%), totaling **27% TBSA**. - Calculation: 4 mL × 55 kg × 27% = **5,940 mL ≈ 6 liters**. Half is given in the first 8 hours (approximately 3 L), and the remaining half over the next 16 hours (approximately 3 L). Total fluid in 24 hours is approximately **6 liters of crystalloids**. *Administer 4 liters of intravenous colloids over the next 8 hours* - The Parkland formula primarily uses **crystalloids** (lactated Ringer's solution) for initial fluid resuscitation in burn patients, not colloids. - Administering only 4 liters would be insufficient given the patient's 27% TBSA burn, and colloids are not first-line. *Administer 5 liters of intravenous colloids over the next 6 hours* - **Colloids** are not the first-line fluid for initial burn resuscitation under the Parkland formula; crystalloids are used. - The timing of 6 hours does not align with the Parkland formula's 24-hour resuscitation period (half in first 8 hours, half in next 16 hours). *Administer 5 liters of intravenous crystalloids over the next 6 hours* - While **crystalloids** are appropriate, 5 liters over 6 hours represents an inappropriately rapid infusion rate that does not follow the Parkland formula timing. - The first 8 hours should receive approximately 3 liters, not 5 liters over 6 hours, which could lead to complications such as **pulmonary edema or compartment syndrome**. *Administer 8 liters of intravenous colloids over the next 12 hours* - This option incorrectly specifies **colloids** instead of crystalloids as the primary fluid for burn resuscitation according to the Parkland formula. - The volume of 8 liters exceeds the calculated requirement of 6 liters for this patient's 27% TBSA burn.

Question 4: A 27-year-old soldier stationed in Libya sustains a shrapnel injury during an attack, causing a traumatic above-elbow amputation. The resulting arterial bleed is managed with a tourniquet prior to transport to the military treatment facility. On arrival, he is alert and oriented to person, place, and time. His armor and clothing are removed. His pulse is 145/min, respirations are 28/min, and blood pressure is 95/52 mm Hg. Pulmonary examination shows symmetric chest rise. The lungs are clear to auscultation. Abdominal examination shows no abnormalities. There are multiple shrapnel wounds over the upper and lower extremities. A tourniquet is in place around the right upper extremity; the right proximal forearm has been amputated. One large-bore intravenous catheter is placed in the left antecubital fossa. Despite multiple attempts, medical staff is unable to establish additional intravenous access. Which of the following is the most appropriate next step in management?

A. Irrigate the shrapnel wounds
B. Perform endotracheal intubation
C. Establish intraosseous access (Correct Answer)
D. Establish central venous access
E. Replace the tourniquet with a pressure dressing

Explanation: ***Establish intraosseous access*** - The patient is in **hemorrhagic shock** (tachycardia, hypotension) and requires rapid fluid resuscitation, but peripheral intravenous access is difficult to obtain. **Intraosseous (IO) access** provides a rapid and reliable route for fluids and medications, especially in emergencies when IV access is challenging. - IO access is a **bridge to definitive venous access** and is crucial for immediate life-saving interventions in trauma. *Irrigate the shrapnel wounds* - While wound irrigation is important for preventing infection, it is **not the immediate priority** when the patient is in hemorrhagic shock. - Addressing the circulatory compromise takes precedence over local wound care. *Perform endotracheal intubation* - The patient is **alert and oriented** with symmetric chest rise and clear lungs, indicating he does not currently have an airway crisis requiring intubation. - Intubation is an invasive procedure that carries risks and should only be performed when indicated for airway protection or respiratory failure. *Establish central venous access* - While central venous access is useful for long-term fluid management and monitoring, it is generally **more time-consuming and technically challenging** to establish than IO access, especially in an emergent, unstable patient. - Given the urgency of rapid fluid administration, IO access is preferred as the immediate next step. *Replace the tourniquet with a pressure dressing* - The patient has an above-elbow amputation, suggesting significant injury, and the tourniquet is currently controlling the bleed. Removing the tourniquet prematurely without proximal surgical control can lead to **recurrent catastrophic hemorrhage**. - A definitive surgical approach is needed to manage the amputation, not simply replacing the tourniquet with a pressure dressing, which may be insufficient to control arterial bleeding.

Question 5: A 35-year-old man is brought to the emergency department from a kitchen fire. The patient was cooking when boiling oil splashed on his exposed skin. His temperature is 99.7°F (37.6°C), blood pressure is 127/82 mmHg, pulse is 120/min, respirations are 12/min, and oxygen saturation is 98% on room air. He has dry, nontender, and circumferential burns over his arms bilaterally, burns over the anterior portion of his chest and abdomen, and tender spot burns with blisters on his shins. A 1L bolus of normal saline is administered and the patient is given morphine and his pulse is subsequently 80/min. A Foley catheter is placed which drains 10 mL of urine. What is the best next step in management?

A. Additional fluids and escharotomy (Correct Answer)
B. Escharotomy
C. Continuous observation
D. Moist dressings and discharge
E. Additional fluids and admission to the ICU

Explanation: ***Additional fluids and escharotomy*** - The patient has **circumferential full-thickness burns** on both arms (dry, nontender), which require **escharotomy** to prevent compartment syndrome and vascular compromise to the limbs. - The **oliguria** (10 mL urine output) despite a 1L fluid bolus indicates **inadequate fluid resuscitation** from burn shock. With approximately 40% TBSA burns, the patient requires aggressive fluid resuscitation per the Parkland formula (4 mL/kg/% TBSA), which would be approximately 11 liters in the first 24 hours. Adequate resuscitation targets urine output of 0.5-1 mL/kg/hr (35-70 mL/hr for this patient). - Both interventions are immediately necessary: fluids for burn shock and escharotomy for circumferential burns. *Escharotomy* - While **escharotomy** is essential for the circumferential full-thickness burns to prevent compartment syndrome, it alone will not address the **severe fluid deficit** causing oliguria and hypoperfusion. - The low urine output reflects systemic hypovolemia from burn shock, not just local compartment issues, requiring aggressive fluid resuscitation. *Continuous observation* - **Continuous observation** is inappropriate given the patient's critical findings: circumferential full-thickness burns requiring urgent escharotomy and oliguria indicating inadequate resuscitation. - Delaying escharotomy can lead to irreversible ischemic damage to the limbs, and inadequate fluid resuscitation can progress to multiorgan failure. *Moist dressings and discharge* - This option is completely inappropriate for a patient with **extensive deep burns** (approximately 40% TBSA) including full-thickness injuries requiring hospitalization and specialized burn care. - Discharge would lead to severe complications including infection, inadequate fluid resuscitation, compartment syndrome, and potential limb loss. *Additional fluids and admission to the ICU* - While ICU admission and additional fluids are necessary components of care, this option is **incomplete** because it omits **escharotomy**, which is urgently needed for the circumferential full-thickness burns. - Escharotomy is a time-sensitive procedure that must be performed promptly to prevent ischemic injury to the limbs from vascular compromise.

Question 6: A 45-year-old male is brought into the emergency room by emergency medical services due to a stab wound in the chest. The wound is located superior and medial to the left nipple. Upon entry, the patient appears alert and is conversational, but soon becomes confused and loses consciousness. The patient's blood pressure is 80/40 mmHg, pulse 110/min, respirations 26/min, and temperature 97.0 deg F (36.1 deg C). On exam, the patient has distended neck veins with distant heart sounds. What is the next best step to increase this patient's survival?

A. Heparin
B. Intravenous fluids
C. Aspirin
D. Intravenous colloids
E. Pericardiocentesis (Correct Answer)

Explanation: ***Pericardiocentesis*** - The patient's presentation with **hypotension**, **tachycardia**, **distended neck veins**, and **distant heart sounds** after a chest stab wound is classic for **cardiac tamponade** (Beck's triad). - **Pericardiocentesis** is the immediate life-saving procedure to drain the pericardial fluid and relieve pressure on the heart, improving cardiac output. - In penetrating trauma, this serves as a **bridge to definitive surgical management** (thoracotomy or sternotomy). *Heparin* - **Heparin** is an anticoagulant and would worsen the situation by increasing bleeding into the pericardial space due to the stab wound. - It is contraindicated in active bleeding and traumatic injury. *Intravenous fluids* - While **IV fluid resuscitation is recommended** in cardiac tamponade to maintain preload and support cardiac output, fluids alone **do not address the underlying mechanical obstruction**. - The primary issue is **extrinsic compression of the heart** requiring drainage, not hypovolemia alone. - Fluids are supportive but not definitive—**pericardiocentesis is the life-saving intervention**. *Aspirin* - **Aspirin** is an antiplatelet agent and would increase the risk of bleeding, exacerbating the patient's condition. - It is used for conditions like myocardial infarction or stroke prevention, not for acute traumatic bleeding. *Intravenous colloids* - Similar to crystalloid fluids, **colloids** may provide temporary hemodynamic support but do not relieve the mechanical compression of the heart. - They are supportive measures that **do not substitute for definitive pericardial drainage**.

Question 7: A 28-year-old woman is brought to the emergency department 30 minutes after being involved in a high-speed motor vehicle collision in which she was the unrestrained driver. On arrival, she is semiconscious and incoherent. She has shortness of breath and is cyanotic. Her pulse is 112/min, respirations are 59/min, and blood pressure is 128/89 mm Hg. Examination shows a 3-cm (1.2-in) laceration on the forehead and multiple abrasions over the thorax and abdomen. There is crepitation on palpation of the thorax on the right. Auscultation of the lung shows decreased breath sounds on the right side. A crunching sound synchronous with the heartbeat is heard best over the precordium. There is dullness on percussion of the right hemithorax. The lips and tongue have a bluish discoloration. There is an open femur fracture on the left. The remainder of the examination shows no abnormalities. Arterial blood gas analysis on room air shows: pH 7.31 PCO2 55 mm Hg PO2 42 mm Hg HCO3- 22 mEq/L O2 saturation 76% The patient is intubated and mechanically ventilated. Infusion of 0.9% saline is begun. Which of the following is the most likely diagnosis?

A. Pulmonary embolism
B. Flail chest
C. Tension pneumothorax
D. Bronchial rupture (Correct Answer)
E. Hemopneumothorax

Explanation: ***Bronchial rupture*** - The presence of a **mediastinal crunching sound (Hamman's sign)** synchronous with the heartbeat, along with **subcutaneous emphysema (crepitation)** and a significant mechanism of injury (high-speed MVA), points strongly towards a bronchial injury. - **Decreased breath sounds** and **dullness to percussion** on the right side, combined with severe hypoxemia and hypercapnia, suggest a major airway disruption leading to air trapping and potential collapse of the lung. *Pulmonary embolism* - While pulmonary embolism can cause **dyspnea** and **hypoxemia**, it typically presents with clear lung auscultation and does not cause **crepitation** or a **mediastinal crunching sound**. - The mechanism of injury and immediate onset of symptoms are more consistent with a traumatic injury rather than an embolic event. *Flail chest* - **Flail chest** involves paradoxical movement of a segment of the chest wall due to multiple rib fractures, which would lead to respiratory distress and crepitation. - However, flail chest does not typically cause a **mediastinal crunching sound** or the severe degree of hypoxemia and hypercapnia seen with a major airway injury without other concomitant severe lung injury. *Tension pneumothorax* - A **tension pneumothorax** would cause severe respiratory distress, diminished breath sounds, and tracheal deviation (which is not described). - While it can cause crepitation (subcutaneous emphysema) and hypoxemia, it usually presents with **hyperresonance** to percussion, not dullness, and does not produce a **mediastinal crunching sound** as prominently. *Hemopneumothorax* - A **hemopneumothorax** would explain **decreased breath sounds** and **dullness to percussion** due to the presence of blood and air in the pleural space. - However, it would not typically cause a **mediastinal crunching sound** (Hamman's sign), which is highly specific for pneumomediastinum, often secondary to tracheobronchial injury.

Question 8: A 59-year-old man is brought to the emergency department by paramedics following a high-speed motor vehicle collision. The patient complains of excruciating chest pain, which he describes as tearing. Further history reveals that the patient is healthy, taking no medications, and is not under the influence of drugs or alcohol. On physical examination, his heart rate is 97/min. His blood pressure is 95/40 mm Hg in the right arm and 60/30 mm Hg in the left arm. Pulses are absent in the right leg and diminished in the left. A neurological examination is normal. A chest X-ray reveals a widened mediastinum. Which of the following is the most likely etiology of this patient's condition?

A. Myocardial rupture
B. Diaphragmatic rupture
C. Traumatic aortic dissection (Correct Answer)
D. Rib fracture
E. Pulmonary contusion

Explanation: ***Traumatic aortic dissection*** - The patient's **"tearing" chest pain**, profound **blood pressure differential** between arms, **absent/diminished pulses** in the legs, and a **widened mediastinum** on chest X-ray immediately after a high-speed collision are classic signs of a traumatic aortic dissection. - The tearing pain, pulse deficits, and widened mediastinum collectively point to a catastrophic vascular injury, most commonly involving the **descending aorta** in trauma. *Myocardial rupture* - Myocardial rupture typically presents with sudden cardiac collapse, **pericardial tamponade**, and profound shock, which might be similar, but it would not explain the **pulse deficits** or the **widened mediastinum**. - While a high-speed collision can cause myocardial contusion, a full rupture leading to hemodynamic instability would usually present differently than the described pulse deficits. *Diaphragmatic rupture* - Diaphragmatic rupture would typically present with respiratory distress, **herniation of abdominal contents** into the chest, and potentially muffled breath sounds on the affected side. - It does not explain the asymmetrical blood pressures, pulse deficits, or the classic "tearing" chest pain related to a vascular event. *Rib fracture* - Rib fractures cause localized chest pain, which is usually exacerbated by breathing and movement, but they do not account for the systemic signs like **blood pressure discrepancies**, **pulse deficits**, or a **widened mediastinum**. - While common in trauma, rib fractures alone are not life-threatening unless they lead to complications like pneumothorax or hemothorax, which are not suggested by the findings. *Pulmonary contusion* - Pulmonary contusion involves bruising of the lung tissue, leading to localized pain, **hemoptysis**, and **hypoxia**, often visible as infiltrates on chest imaging. - This condition would not explain the **tearing pain**, **blood pressure differential**, **pulse deficits**, or the **widened mediastinum**, which are indicative of a major vascular injury.

Question 9: A 60-year-old man is brought to the emergency department 25 minutes after falling and hitting his left flank on a concrete block. He has severe left-sided chest pain and mild shortness of breath. He underwent a right knee replacement surgery 2 years ago. He has type 2 diabetes mellitus. He has smoked one pack of cigarettes daily for 42 years. Current medications include metformin, sitagliptin, and a multivitamin. He appears uncomfortable. His temperature is 37.5°C (99.5°F), pulse is 102/min, respirations are 17/min, and blood pressure is 132/90 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 96%. Examination shows multiple abrasions on his left flank and trunk. The upper left chest wall is tender to palpation and bony crepitus is present. There are decreased breath sounds over both lung bases. Cardiac examination shows no murmurs, rubs, or gallops. The abdomen is soft and nontender. Focused assessment with sonography for trauma is negative. An x-ray of the chest shows nondisplaced fractures of the left 4th and 5th ribs, with clear lung fields bilaterally. Which of the following is the most appropriate next step in management?

A. Internal fixation
B. Admission and surveillance in the intensive care unit
C. Prophylactic antibiotic therapy
D. Adequate analgesia and conservative management (Correct Answer)
E. Continuous positive airway pressure

Explanation: ***Adequate analgesia and conservative management*** - The patient has **nondisplaced rib fractures** with clear lung fields and stable vitals, indicating that conservative management with **adequate analgesia** is the most appropriate initial step. - Pain control is crucial to prevent complications such as **pneumonia** and **atelectasis** by allowing the patient to breathe deeply and cough effectively. *Internal fixation* - **Internal fixation** is generally reserved for patients with severe rib fractures, such as **flail chest**, significant displacement, or those who fail conservative management, which is not the case here. - This patient's fractures are **nondisplaced**, and he is hemodynamically stable without signs of respiratory compromise requiring surgical intervention. *Admission and surveillance in the intensive care unit* - Admission to the **intensive care unit (ICU)** is typically indicated for patients with **flail chest**, severe respiratory distress, or significant associated injuries, which are absent in this patient. - While rib fractures can be serious, stable patients with **nondisplaced fractures** do not automatically require ICU admission; a general medical ward or even outpatient management (depending on overall stability and pain control) might be sufficient. *Prophylactic antibiotic therapy* - There is currently **no evidence of infection** (e.g., fever, elevated white blood cell count, purulent sputum) to warrant prophylactic antibiotic therapy. - Rib fractures themselves, without an open wound or lung contusion leading to pneumonia, do not routinely require **antibiotics**. *Continuous positive airway pressure* - **Continuous positive airway pressure (CPAP)** is used for respiratory support in conditions like **acute respiratory failure** or **sleep apnea**, or in severe chest wall injuries like flail chest causing significant respiratory compromise. - This patient has an **oxygen saturation of 96%** on room air and mild shortness of breath, indicating he does not currently require CPAP.

Question 10: A 32-year-old man is brought to the emergency department 15 minutes after falling 7 feet onto a flat-top wooden post. On arrival, he is in severe pain and breathing rapidly. His pulse is 135/min, respirations are 30/min, and blood pressure is 80/40 mm Hg. There is an impact wound in the left fourth intercostal space at the midaxillary line. Auscultation shows tracheal deviation to the right and absent breath sounds over the left lung. There is dullness to percussion over the left chest. Neck veins are flat. Cardiac examination shows no abnormalities. Two large-bore intravenous catheters are placed and intravenous fluid resuscitation is begun. Which of the following is the most likely diagnosis?

A. Bronchial rupture
B. Cardiac tamponade
C. Flail chest
D. Hemothorax (Correct Answer)
E. Tension pneumothorax

Explanation: ***Hemothorax*** - The combination of **absent breath sounds**, **dullness to percussion** on the left, and **hypotension with flat neck veins** following trauma strongly suggests a massive hemothorax causing **hypovolemic shock** from significant blood loss into the pleural space. - The injury site at the **left fourth intercostal space** (midaxillary line) is a common location for vascular injury. Dullness to percussion indicates fluid (blood) accumulation, not air. - **Flat neck veins** are the key finding distinguishing hypovolemic shock (blood loss) from obstructive shock (tension pneumothorax or tamponade would cause distended neck veins). - Tracheal deviation away from the affected side can occur with massive hemothorax due to mediastinal shift from fluid accumulation. *Bronchial rupture* - While possible with severe trauma, bronchial rupture typically presents with significant **air leak**, leading to subcutaneous emphysema and persistent pneumothorax, rather than **dullness to percussion** (which indicates fluid, not air). - Usually causes **hyperresonance** on percussion, not dullness. Does not typically cause immediate massive hypovolemic shock with flat neck veins. *Cardiac tamponade* - Characterized by **Beck's triad**: hypotension, muffled heart sounds, and **distended neck veins** (due to impaired venous return). - This patient has **flat neck veins**, which rules out tamponade. Additionally, cardiac examination shows no abnormalities (would expect muffled heart sounds in tamponade). *Flail chest* - Involves **paradoxical chest wall movement** due to multiple rib fractures creating a free-floating segment. While it causes pain and respiratory distress, it does not explain absent breath sounds, dullness to percussion, tracheal deviation, or hypovolemic shock. - The primary issue is usually underlying pulmonary contusion, not massive blood loss into the pleural space. *Tension pneumothorax* - Classic presentation includes **absent breath sounds**, **hyperresonance to percussion** (air accumulation), **tracheal deviation** away from affected side, and **distended neck veins** (obstructive shock). - This patient has **dullness to percussion** (fluid, not air) and **flat neck veins** (hypovolemic, not obstructive shock), making tension pneumothorax incompatible with the clinical picture.

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