Trauma Practice Questions

Q: A patient presents with a penetrating knife injury to the abdomen following an assault. X-ray reveals gas under the diaphragm. Which is the most common organ damaged in this scenario?

Intestine. **Explanation:** The correct answer is **Intestine (Small Bowel)**. In the context of **penetrating abdominal trauma** (stab wounds or knife injuries), the **small intestine** is the most frequently injured organ. This is due to its large surface area and the fact that it occupies most of the abdominal cavity. The clinical finding of **gas under the diaphragm (pneumoperitoneum)** on an X-ray is a pathognomonic sign of a hollow viscus perforation, further pointing toward the bowel as the site of injury. **Analysis of Options:** * **B. Intestine (Correct):** The small bowel is the #1 most common organ injured in stab wounds, followed by the liver. * **A. Spleen:** While the spleen is the most common organ injured in **blunt** abdominal trauma (e.g., RTA), it is less commonly involved in penetrating injuries compared to the liver and intestines. * **C. Liver:** The liver is the second most common organ injured in stab wounds, but it is a solid organ; an isolated liver injury would typically cause hemoperitoneum rather than pneumoperitoneum. * **D. Lung:** While a high abdominal stab wound can pierce the diaphragm and injure the lung, it is not the most common organ damaged in an abdominal assault. **NEET-PG High-Yield Pearls:** * **Most common organ injured in Blunt Trauma:** Spleen (followed by Liver). * **Most common organ injured in Penetrating Trauma (Stab/Knife):** Small Intestine (followed by Liver). * **Most common organ injured in Gunshot Wounds:** Small Intestine (followed by Colon). * **Pneumoperitoneum:** In trauma, this is an absolute indication for immediate **Exploratory Laparotomy**.

Q: Pneumothorax of what size generally needs operative treatment?

>20%. **Explanation:** The management of a pneumothorax is determined by the patient's clinical stability and the size of the collapse. In surgical practice and standard textbooks (like Bailey & Love), a pneumothorax is generally classified as "small" if it is 20%** of the hemithorax volume. **Why >20% is correct:** A pneumothorax exceeding 20% typically results in significant respiratory compromise and a reduced physiological reserve. Such cases generally require active intervention, such as **tube thoracostomy (ICD)** or needle aspiration, rather than simple observation. Spontaneous resolution of air occurs at a slow rate (approx. 1.25% per day); therefore, larger leaks (>20%) would take too long to resolve naturally and carry a higher risk of progressing to a tension pneumothorax. **Analysis of Incorrect Options:** * **A (>10%):** Too small. Most stable patients with a 30% and >40%):** While these definitely require treatment, the threshold for initiating operative/interventional treatment starts at **20%**. Waiting until 30-40% collapse would delay necessary care for a symptomatic patient. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Chest X-ray (PA view) in full expiration. * **Most sensitive Investigation:** CT Thorax. * **Management:** * Small ( 20%) or symptomatic: Intercostal Drainage (ICD). * **ICD Insertion Site:** 5th intercostal space, anterior to the mid-axillary line (Safe Triangle). * **Tension Pneumothorax:** A clinical diagnosis; requires immediate needle decompression in the 2nd ICS (MCL) or 5th ICS (AAL) before getting an X-ray.

Q: All except one are formulas used to calculate fluid replacement in burn patients?

Holiday segar formula. The correct answer is **D. Holiday Segar formula**. ### **Explanation** Fluid resuscitation is critical in the management of major burns to prevent hypovolemic shock. The formulas used for this purpose are based on the patient's weight and the Total Body Surface Area (TBSA) affected. 1. **Why Holiday Segar is the correct answer:** The **Holliday-Segar formula** (the 100/50/20 rule) is used to calculate **maintenance fluid requirements** in pediatric and adult patients based on body weight. It is not specific to burn resuscitation and does not account for the massive fluid shifts (third-spacing) seen in thermal injuries. 2. **Analysis of Incorrect Options:** * **Parkland Regime:** The most commonly used formula. It calculates fluid for the first 24 hours as **4 mL × Weight (kg) × % TBSA**. Half is given in the first 8 hours, and the remainder over the next 16 hours. * **Brooke Formula:** An older crystalloid-based formula. The Modified Brooke formula uses **2 mL × Weight (kg) × % TBSA** of Ringer’s Lactate. * **Evan’s Formula:** A formula that incorporates both crystalloids (Normal Saline) and colloids (Blood/Plasma) along with glucose for maintenance. ### **High-Yield Clinical Pearls for NEET-PG** * **Fluid of Choice:** **Ringer’s Lactate (RL)** is the preferred crystalloid in the first 24 hours to avoid hyperchloremic metabolic acidosis. * **Monitoring Gold Standard:** The adequacy of fluid resuscitation is best monitored by **Hourly Urine Output**. * *Adults:* 0.5 mL/kg/hr (approx. 30–50 mL/hr). * *Children (<30kg):* 1 mL/kg/hr. * **Rule of Nines:** Used to quickly estimate TBSA in adults; for children, the **Lund and Browder chart** is more accurate. * **Fluid Creep:** Over-resuscitation beyond formula requirements can lead to complications like pulmonary edema and compartment syndrome.

Q: A patient sustains a blunt injury to the abdomen and is hemodynamically stable. What is the next investigation?

FAST scan. In the management of Blunt Trauma Abdomen (BTA), the primary goal is to identify intra-abdominal hemorrhage or hollow viscus injury. **Why FAST is the Correct Answer:** **FAST (Focused Assessment with Sonography for Trauma)** is the initial screening investigation of choice for both stable and unstable patients. It is rapid, non-invasive, and highly sensitive for detecting free intraperitoneal fluid (hemoperitoneum) in four specific areas: the Morison pouch (RUQ), splenorenal recess (LUQ), pelvis (Pouch of Douglas), and the pericardial sac. In a stable patient, a positive FAST often leads to a CECT (Gold Standard) for further characterization, while a negative FAST warrants observation or further testing. **Why Other Options are Incorrect:** * **X-ray Abdomen:** While it can show pneumoperitoneum (air under the diaphragm), it is insensitive for detecting hemoperitoneum or solid organ injury, which are more common in blunt trauma. * **Barium Swallow:** This is used for esophageal pathology and has no role in the acute evaluation of blunt abdominal trauma. * **DPL (Diagnostic Peritoneal Lavage):** Once the gold standard, it is now largely replaced by FAST. It is invasive and cannot detect retroperitoneal injuries. It is currently reserved for hemodynamically unstable patients when FAST is unavailable or inconclusive. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CECT Abdomen (only for hemodynamically **stable** patients). * **Unstable Patient + Positive FAST:** Proceed directly to Emergency Laparotomy. * **Most common organ injured in BTA:** Spleen. * **FAST cannot detect:** Retroperitoneal bleed or hollow viscus perforation (less than 100ml fluid).

Q: What is the recommended temperature of water for cooling a burn wound?

15°C. The primary goal of immediate first aid in thermal burns is to stop the burning process and dissipate heat from the tissues. ### **Why 15°C is the Correct Answer** The recommended temperature for cooling a burn wound is **15°C (range 12°C–18°C)**. Using cool running tap water at this temperature for approximately **20 minutes** is the gold standard. * **Mechanism:** It limits the depth of the injury by reducing the "zone of stasis" (preventing it from progressing to the zone of coagulation). It also provides significant analgesia by stabilizing nerve endings and reduces local edema by causing mild vasoconstriction. ### **Analysis of Incorrect Options** * **A (20°C) & B (25°C):** While lukewarm water is better than no water, these temperatures are too close to core body temperature to effectively dissipate the deep tissue heat required to halt thermal progression in a timely manner. * **C (10°C):** Temperatures below 12°C, especially ice-cold water or ice (0°C), are contraindicated. Extreme cold causes intense **vasoconstriction**, which paradoxically worsens tissue ischemia and can lead to "frostbite" injury on top of the burn. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Rule of 20":** Apply **20**°C (or cool) water for **20** minutes within the first **20** minutes of injury (though it remains beneficial up to 3 hours post-burn). * **Avoid Ice:** Never apply ice directly to a burn; it increases the depth of tissue necrosis. * **Hypothermia Risk:** In large surface area burns (>10-15%), prolonged cooling can lead to systemic hypothermia. Always keep the rest of the patient warm while cooling the wound. * **Chemical Burns:** These require much longer irrigation (up to 1-2 hours) compared to thermal burns.

Q: Which layer is involved in blister formation in a superficial partial thickness burn?

Papillary dermis. **Explanation:** In burns, the depth of tissue injury determines the clinical presentation. A **superficial partial-thickness burn** (Second-degree burn) involves the entire epidermis and extends into the **papillary dermis** (the superficial layer of the dermis). **Why Papillary Dermis is correct:** Blister formation is the hallmark of superficial partial-thickness burns. It occurs because the heat causes damage to the **dermal-epidermal junction**. This leads to inflammatory mediator release and increased capillary permeability in the rich vascular plexus of the papillary dermis. Fluid then leaks out and collects between the epidermis and the dermis, lifting the epidermis to form a blister. These burns are exquisitely painful because the sensory nerve endings located in this layer remain intact but exposed. **Analysis of Incorrect Options:** * **A. Epidermis:** Damage limited only to the epidermis is a **first-degree burn** (e.g., sunburn). These are characterized by erythema and pain but **no blisters**. * **B. Dermis:** This is too broad. The dermis is divided into two distinct layers (papillary and reticular) with different clinical outcomes. * **D. Reticular dermis:** Involvement of the deeper reticular dermis indicates a **deep partial-thickness burn**. These appear mottled white/pink, have decreased sensation, and typically do not form the classic thin-walled blisters seen in superficial burns. **High-Yield NEET-PG Pearls:** * **Superficial Partial Thickness:** Blisters present, very painful, blanches on pressure, heals in 7–21 days without scarring. * **Deep Partial Thickness:** Fixed staining (non-blanching), reduced sensation, heals with hypertrophic scarring/contractures. * **Full Thickness:** Leathery, charred, or pearly white; painless (nerves destroyed); requires skin grafting.

Question 1

A patient presents with a penetrating knife injury to the abdomen following an assault. X-ray reveals gas under the diaphragm. Which is the most common organ damaged in this scenario?

Accepted Answer

Intestine

Answer

Spleen

Answer

Liver

Answer

Lung

Question 2

Pneumothorax of what size generally needs operative treatment?

Accepted Answer

>20%

Answer

>10%

Answer

>30%

Answer

>40%

Question 3

All except one are formulas used to calculate fluid replacement in burn patients?

Accepted Answer

Holiday segar formula

Answer

Brooke formula

Answer

Evan's formula

Answer

Parkland regime

Question 4

A patient sustains a blunt injury to the abdomen and is hemodynamically stable. What is the next investigation?

Accepted Answer

FAST scan

Answer

X-ray abdomen

Answer

Barium swallow

Answer

DPL

Question 5

Fasciotomy involves cutting all of the following structures except?

Accepted Answer

Muscles

Answer

Skin

Answer

Superficial fascia

Answer

Deep fascia

Question 6

A 19-year-old man presents with a stab wound at the base of the neck (zone I). What is the most important concern for patients with such injuries?

Accepted Answer

Exsanguinating hemorrhage

Answer

Upper extremity ischemia

Answer

Cerebral infarction

Answer

Mediastinitis

Question 7

What is the recommended temperature of water for cooling a burn wound?

Accepted Answer

15°C

Answer

20°C

Answer

25°C

Answer

10°C

Question 8

A 43-year-old man presents to the emergency department with massive facial swelling, ecchymosis, and an elongated face after being hit in the face with a baseball bat. There is mobility of the middle third of the face on digital manipulation of the maxilla. What is the likely diagnosis?

Accepted Answer

LeFort III fracture

Answer

Lambdoid injury

Answer

Odontoid fracture

Answer

Palatal split

Question 9

In case of pelvic fracture with urethral injury, what is the most important first step in management?

Accepted Answer

Treatment of shock and haemorrhage

Answer

Repair of the injured urethra

Answer

Fixation of pelvic fracture

Answer

Splinting the urethra with catheters

Question 10

Which layer is involved in blister formation in a superficial partial thickness burn?

Accepted Answer

Papillary dermis

Answer

Epidermis

Answer

Dermis

Answer

Reticular dermis

Trauma — MCQs

Trauma — MCQs

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