Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 1231: Which group is most likely to sustain a traumatic aortic injury during a road traffic accident?

A. Pedestrian
B. Rear seat passengers
C. Drivers
D. Front seat passengers (Correct Answer)

Explanation: ***Front seat passengers*** - Traumatic aortic injury (TAI) in **front-seat passengers** is often due to the "paper bag effect" during sudden deceleration, where increased intra-thoracic pressure against a closed glottis causes a sudden rise in pressure within the aorta. - This mechanism also includes direct impact with the dashboard or steering wheel, leading to a shearing force on the aorta, most commonly at the **aortic isthmus**. *Drivers* - Drivers are susceptible to TAI due to **steering wheel impact** during high-speed collisions. - While drivers are at risk for TAI, the specifics of car design and occupant kinematics often put front-seat passengers at a slightly higher risk in certain impact types. *Pedestrian* - Pedestrians are typically involved in direct impact injuries with vehicles, leading to a wide range of **blunt force trauma**, including skeletal fractures and head injuries. - While aortic injury can occur, the mechanism is usually different from the deceleration injuries seen in vehicle occupants and is less common than other severe injuries. *Rear seat passengers* - Rear seat passengers are generally at a **lower risk** for direct thoracic trauma compared to front-seat occupants due to less dashboard or steering wheel interaction. - TAI in rear seat passengers would typically occur in severe, high-energy collisions, often related to overall vehicle deformation or secondary impacts rather than specific occupant compartment interactions.

Question 1232: Which of the following statements is true regarding the rupture of the diaphragm?

A. Chest X-ray is the best diagnostic tool.
B. Laparoscopy is the standard approach for repair.
C. Repair of a ruptured diaphragm is best approached via laparotomy. (Correct Answer)
D. Diagnostic peritoneal lavage is the most relevant for diaphragm injuries.

Explanation: **Repair of a ruptured diaphragm is best approached via laparotomy.** - **Laparotomy** offers superior exposure for identifying and repairing diaphragmatic tears, particularly in the trauma setting where associated intra-abdominal injuries are common. - This approach allows for direct visualization of the diaphragm's undersurface and comprehensive assessment of intra-abdominal organs for concomitant damage. *Chest X-ray is the best diagnostic tool.* - A **chest X-ray** can suggest diaphragmatic rupture (e.g., elevated hemidiaphragm, intrathoracic abdominal contents) but is often inconclusive and has a high false-negative rate, especially initially. - While it's a useful initial screening tool, it's not the **definitive diagnostic modality** compared to CT or surgical exploration. *Laparoscopy is the standard approach for repair.* - While **laparoscopy** can be used in stable patients with isolated, chronic, or small diaphragmatic ruptures, it is not the standard approach for acute traumatic ruptures due to limited visibility, difficulty controlling bleeding, and challenges in managing associated organ injuries. - The acute setting often involves **hemodynamic instability** and the need for immediate, comprehensive surgical access, which laparoscopy may not fully provide. *Diagnostic peritoneal lavage is the most relevant for diaphragm injuries.* - **Diagnostic peritoneal lavage (DPL)** is used to detect intra-abdominal hemorrhage or visceral injury, which may indirectly suggest a diaphragmatic injury, but it does not directly visualize or diagnose the diaphragmatic rupture itself. - The increasing use of **focused abdominal sonography for trauma (FAST)** and **CT scans** has largely replaced DPL as a primary diagnostic tool for abdominal trauma and often yields more specific information.

Question 1233: A 50-year-old female with a 50 kg body weight suffered burns after a pressure cooker blast, involving 45% of her total body surface area. How much fluid should be given in the first 8 hours?

A. 4.5 litres (Correct Answer)
B. 4 litres
C. 5 litres
D. 6 litres

Explanation: ***4.5 litres*** - The **Parkland formula** for fluid resuscitation in burn patients is **4 mL x body weight (kg) x % TBSA burned**. - For this patient: 4 mL x 50 kg x 45% = 9000 mL. Half of this volume (4500 mL or **4.5 litres**) is given in the first **8 hours**. *4 litres* - This volume would be insufficient for a patient with a 45% TBSA burn and 50 kg body weight according to the **Parkland formula**. - Undersupplying fluid in severe burns can lead to **hypovolemic shock** and organ dysfunction. *5 litres* - This volume is slightly more than the calculated amount for the first 8 hours based on the **Parkland formula**. - Over-resuscitation can lead to complications such as **pulmonary edema** and **abdominal compartment syndrome**. *6 litres* - This volume is significantly higher than the recommended amount for the first 8 hours, indicating **over-resuscitation**. - Excessive fluid administration can worsen burn edema, leading to **compartment syndromes** and potentially impacting organ function negatively.

Question 1234: Which of the following statements about maxillary fractures is false?

A. Midpalatal fracture has 8% incidence
B. Geriatric maxillary fracture is difficult to treat
C. Pediatric maxillary fracture is more comminuted (Correct Answer)
D. All four maxillary buttresses are rarely fractured together

Explanation: **Pediatric maxillary fracture is more comminuted** - Pediatric bones, including the maxilla, are generally more *elastic* and less brittle than adult bones, leading to *greenstick fractures* or less comminution, rather than more. - The presence of *developing tooth buds* also influences fracture patterns, making them less prone to extensive fragmentation. *Geriatric maxillary fracture is difficult to treat* - *Osteoporosis* and reduced bone density in geriatric patients can make plate fixation challenging due to poor screw purchase. - Slower healing rates and increased comorbidities in older patients can complicate surgical management and recovery. *Midpalatal fracture has 8% incidence* - This statement refers to a specific incidence rate for midpalatal fractures, which is a *correct factual statement* in the context of patterns of maxillary trauma. - Identifying specific incidence rates helps in understanding the epidemiology and typical presentations of maxillary injuries. *All four maxillary buttresses are rarely fractured together* - The maxilla is supported by four pairs of buttresses (*nasomaxillary, zygomaticomaxillary, pterygomaxillary, and vertical*) that dissipate forces. - It is uncommon for all four buttresses to be simultaneously fractured in a single traumatic event, as specific impact forces usually target certain areas.

Question 1235: What is the volume threshold that defines a massive blood transfusion?

A. Transfusion of 1 unit every 30 minutes for 6 hours.
B. Transfusion of 5 units in 12 hours.
C. More than 10 units in 24 hours. (Correct Answer)
D. Transfusion of 8 units in 24 hours.

Explanation: ***More than 10 units in 24 hours.*** - This is the **most widely accepted and standard definition** for a massive blood transfusion used in clinical practice and medical literature. - This threshold indicates that a patient has received a volume of blood products roughly equivalent to their **total blood volume** within a 24-hour period. - This definition is used to trigger **massive transfusion protocols (MTP)** in trauma and critical care settings. *Transfusion of 1 unit every 30 minutes for 6 hours.* - This scenario would result in 12 units over 6 hours, which does represent a massive transfusion situation clinically. However, the **standard textbook definition** refers to the total unit threshold over a 24-hour period, not a rate-based criterion. - While this rate of transfusion is critical and would trigger massive transfusion protocols, the question asks for the **volume threshold definition**, which is standardly stated as ≥10 units in 24 hours. *Transfusion of 5 units in 12 hours.* - This volume of transfusion is considered a **moderate to large transfusion**, not meeting the criteria for a massive blood transfusion. - While substantial and requiring close monitoring, it does not reach the commonly accepted threshold of 10 or more units within 24 hours. *Transfusion of 8 units in 24 hours.* - This amount is significant but falls short of the conventional definition of a **massive blood transfusion**, which requires 10 or more units in 24 hours. - While requiring aggressive management and monitoring, it doesn't meet the standard diagnostic threshold for massive transfusion.

Question 1236: What is the primary aim of performing an abbreviated laparotomy in trauma surgery?

A. Definitive repair of all injuries
B. Reduction of contamination
C. Rapid stabilization of the patient
D. Haemostasis (Correct Answer)

Explanation: ***Haemostasis*** - The primary aim of abbreviated laparotomy (damage control surgery) is to achieve **rapid control of life-threatening hemorrhage**. - This involves temporary measures to stop bleeding from major vessels and solid organ injuries, preventing exsanguination and further physiological deterioration. - **Damage control prioritizes hemorrhage control over definitive repair**, using techniques like packing, shunts, and temporary vessel ligation. *Definitive repair of all injuries* - This is specifically **NOT** the goal of abbreviated laparotomy. - Definitive repairs are **delayed** until the patient is physiologically stable (after resuscitation in ICU). - Attempting complete repair in an unstable patient leads to the "lethal triad" (hypothermia, acidosis, coagulopathy). *Reduction of contamination* - While contamination control is an **important component** of damage control surgery, it is typically **secondary to hemorrhage control**. - The sequence prioritizes stopping bleeding first, then controlling contamination from bowel injuries. *Rapid stabilization of the patient* - This is the **overall goal** of damage control surgery but not the specific primary aim of the laparotomy itself. - Stabilization is achieved **through** specific interventions during the abbreviated laparotomy, primarily haemostasis and contamination control.

Question 1237: A 24-year-old man falls on the ground when he is struck in the right temple by a baseball. While being driven to the hospital, he lapses into coma. On examination, he is unresponsive with a dilated right pupil. Which of the following is the most important step in initial management?

A. CT scan of the head (Correct Answer)
B. Craniotomy
C. Doppler ultrasound examination of the neck
D. X-ray of the skull and cervical spine

Explanation: ***CT scan of the head*** - A **CT scan of the head** is crucial for rapidly diagnosing the likely **epidural hematoma** suggested by the mechanism of injury (trauma to the temple, causing rupture of the **middle meningeal artery**) and rapid neurological deterioration with **fixed dilated pupil**. - This imaging will confirm the presence and size of the hematoma, guiding urgent surgical intervention if necessary. - Even in rapidly deteriorating patients, obtaining a CT scan (which takes only minutes) is essential to confirm diagnosis, localize the hematoma, and prevent operating on the wrong side. *Craniotomy* - While a **craniotomy** is the definitive treatment for an epidural hematoma, it should only be performed after a confirmed diagnosis via imaging. - Doing so without imaging risks unnecessary surgery or operating on the wrong side. *X-ray of the skull and cervical spine* - An **X-ray of the skull and cervical spine** would show bone fractures but would not directly visualize an intracranial hematoma, which is the immediate life-threatening issue. - While important for evaluating spinal stability in trauma, it is secondary to assessing intracranial pathology in this rapidly deteriorating patient. *Doppler ultrasound examination of the neck* - A **Doppler ultrasound of the neck** is used to assess vascular structures like the carotid and vertebral arteries. - This would not provide information on intracranial pressure or hematoma formation, which is the immediate concern given the patient's symptoms.

Question 1238: Thoracotomy is indicated in all the following conditions except:

A. Rapidly accumulating haemothorax
B. Massive air leak
C. Pulmonary contusion (Correct Answer)
D. Penetrating chest injuries

Explanation: ***Pulmonary contusion*** - **Pulmonary contusion** is a bruise of the lung parenchyma that typically resolves with **supportive care** (oxygen, fluid management, analgesia, respiratory support) [1]. - It is generally *not* an indication for thoracotomy and is managed **conservatively** in most cases [1]. - Surgical intervention is only considered if complicated by other issues such as **uncontrolled hemorrhage**, massive hemothorax, or other injuries requiring exploration. *Penetrating chest injuries* - While approximately **85% of penetrating chest injuries** are managed conservatively with tube thoracostomy alone, **selective indications** for thoracotomy include: - **Cardiac tamponade** or suspected cardiac injury - **Great vessel injury** with hemodynamic instability - **Massive initial hemothorax** (>1500 mL) or persistent bleeding (>200 mL/hr) - **Trans-mediastinal trajectory** with suspected esophageal or major vascular injury - The key is that *specific criteria* determine need for thoracotomy, not the penetrating injury itself. *Rapidly accumulating haemothorax* - A **rapidly accumulating haemothorax** with **>1500 mL initial output** or **>200 mL/hour for 2-4 consecutive hours** indicates significant ongoing intrathoracic bleeding. - This is an **absolute indication** for thoracotomy for **source identification and hemorrhage control** [2]. - Without surgical intervention, such bleeding leads to **hemodynamic instability**, shock, and death. *Massive air leak* - A **massive persistent air leak** from chest tube, unresponsive to initial management, suggests a large **tracheobronchial injury** or major lung parenchymal disruption [3]. - This persistent leak prevents **lung re-expansion** and adequate ventilation. - Thoracotomy is indicated for **surgical repair** of the damaged bronchus, major airway, or extensive lung laceration [2].

Question 1239: Tarsometatarsal amputation is also known as what?

A. Chopart amputation
B. Pirogoff amputation
C. Symes amputation
D. Lisfranc amputation (Correct Answer)

Explanation: ***Lisfranc amputation*** - A **Lisfranc amputation** is a surgical procedure that involves the disarticulation of the **tarsometatarsal joint**, effectively removing the forefoot while preserving the midfoot and hindfoot. - This specific anatomical plane defines the **tarsometatarsal amputation**, which is named after Jacques Lisfranc de St. Martin, who first described the surgical technique. *Chopart amputation* - A **Chopart amputation** involves disarticulation through the **midtarsal joint** (talonavicular and calcaneocuboid joints), which is more proximal than the tarsometatarsal joint. - This amputation preserves the talus and calcaneus but removes the entire midfoot and forefoot. *Pirogoff amputation* - A **Pirogoff amputation** is a type of ankle disarticulation that involves a **horizontal osteotomy of the calcaneus**, preserving a portion of the calcaneus and fusing it to the distal tibia. - This procedure is performed more proximally than a tarsometatarsal amputation and is designed to create an end-bearing stump. *Symes amputation* - A **Symes amputation** is an **ankle disarticulation** that removes the entire foot along with the malleoli, preserving the heel pad and attaching it to the distal tibia to create a weight-bearing stump. - This is a more proximal amputation than a tarsometatarsal amputation, involving the ankle joint rather than joints within the foot.

Question 1240: Pelvic fracture is most commonly associated with which type of bladder injury?

A. Extraperitoneal bladder rupture (Correct Answer)
B. Intraperitoneal bladder rupture
C. Anterior urethral injury
D. Posterior urethral injury

Explanation: ***Extraperitoneal bladder rupture*** - **Pelvic fractures** are most commonly associated with **extraperitoneal bladder ruptures** (85-90% of bladder injuries from pelvic fractures). The tear in the bladder often occurs at the neck or anterior wall. These ruptures result from bone fragments from the pelvic fracture directly puncturing the bladder or from shearing forces. - Urine extravasates into the **retropubic space** and other extraperitoneal pelvic tissues, causing symptoms like suprapubic pain, hematuria, and difficulty voiding. - **Posterior urethral injuries** are also commonly associated with pelvic fractures (particularly pubic rami fractures), but among bladder injuries specifically, extraperitoneal rupture is most characteristic. *Intraperitoneal bladder rupture* - **Intraperitoneal bladder ruptures** are less common with pelvic fractures (10-15% of pelvic fracture-related bladder injuries) and typically occur from a direct blow to a **distended bladder**, causing rupture of the bladder dome. - Urine extravasates into the **peritoneal cavity**, leading to generalized abdominal pain, peritonitis, and potentially a larger volume of fluid accumulation. *Anterior urethral injury* - **Anterior urethral injuries** (e.g., bulbous or pendulous urethra) are usually caused by a **straddle injury** or direct trauma to the perineum. - They are generally **not associated with pelvic fractures**, which typically affect the **posterior urethra** (membranous portion) in males, particularly with pubic rami fractures.

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