Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 41: According to Killey and Kay, which of the following is NOT an absolute indication for tooth removal in cases of fracture?

A. Vertical fracture of the root
B. Pre-existing periapical lesion
C. Luxation and subluxation of the tooth from the socket
D. A tooth that is intact but present in the line of fracture and shows no evidence of mobility or inflammation. (Correct Answer)

Explanation: In maxillofacial trauma, the management of a tooth in the line of a fracture has evolved from routine extraction to a more conservative approach. According to the criteria established by **Killey and Kay**, the primary goal is to preserve teeth unless they pose a risk to fracture healing or are non-viable. ### **Explanation of the Correct Option** **Option D** is the correct answer because an intact, healthy tooth in the fracture line acts as a natural "splint" or "wedge," aiding in the reduction and stabilization of the fracture segments. If the tooth is firm, lacks inflammation, and does not interfere with occlusion, it is retained and monitored. ### **Analysis of Incorrect Options (Absolute Indications for Removal)** * **Vertical fracture of the root (Option A):** A vertically fractured root cannot be salvaged and serves as a direct pathway for infection from the oral cavity into the fracture site, leading to non-union or osteomyelitis. * **Pre-existing periapical lesion (Option B):** Teeth with chronic apical periodontitis or cysts are reservoirs of infection. In the presence of a fracture, these pathogens can cause infected malunion. * **Luxation and subluxation (Option C):** If a tooth is severely loosened or displaced from its socket within the fracture line, it loses its blood supply and becomes a foreign body, increasing the risk of infection. ### **High-Yield Clinical Pearls for NEET-PG** * **General Rule:** "When in doubt, leave it in," provided the patient is covered with antibiotics and the tooth is not infected. * **Other Absolute Indications for Removal:** 1. Teeth that prevent the reduction of fracture fragments. 2. Advanced periodontal disease with significant bone loss. 3. Teeth with extensive dental caries (non-restorable). * **Antibiotic Prophylaxis:** Mandatory when a tooth is retained in the fracture line to prevent the conversion of a closed fracture into an infected open fracture.

Question 42: What is the initial fluid replacement strategy for a 20% blood loss?

A. Colloids and Crystalloids (Correct Answer)
B. Cryoprecipitate
C. Plasma
D. Packed red blood cells

Explanation: **Explanation:** The management of hemorrhagic shock is a high-yield topic for NEET-PG. According to the **ATLS (Advanced Trauma Life Support)** classification of hemorrhagic shock, a **20% blood loss** falls under **Class II Hemorrhage** (15–30% loss). **Why Option A is Correct:** For Class II hemorrhage, the initial management focuses on restoring intravascular volume to maintain organ perfusion. The standard protocol involves the use of **Crystalloids** (like Normal Saline or Ringer’s Lactate) to replace volume. While crystalloids are the first line, **Colloids** (like Albumin or Hydroxyethyl starch) are also effective volume expanders that stay in the intravascular space longer. In clinical practice and traditional surgical teaching, a combination or a choice between these two is the "initial" strategy before blood products are considered. **Why Other Options are Incorrect:** * **B & C (Cryoprecipitate/Plasma):** These are blood components used to correct coagulopathy (massive transfusion protocols) rather than as initial volume expanders for moderate (20%) blood loss. * **D (Packed Red Blood Cells):** PRBCs are generally indicated for **Class III (30–40%)** and **Class IV (>40%)** hemorrhage. In Class II, the body’s compensatory mechanisms and crystalloid resuscitation are usually sufficient to maintain oxygen delivery. **Clinical Pearls for NEET-PG:** * **Class I (<15%):** Body compensates; no change in BP/HR; Crystalloids only. * **Class II (15-30%):** Tachycardia, increased diastolic BP (narrow pulse pressure); Crystalloids/Colloids. * **Class III (30-40%):** Hypotension, marked tachycardia, confusion; **Blood transfusion required.** * **Class IV (>40%):** Lethargy, negligible urine output; **Massive Transfusion Protocol (MTP).** * **Golden Rule:** Always start with 1 liter of warmed isotonic crystalloid in adults.

Question 43: In crush syndrome, what is a common complication?

A. Renal failure (Correct Answer)
B. Liver failure
C. Cardiac failure
D. Endocrine crisis

Explanation: **Explanation:** **Crush Syndrome** (also known as Bywaters' Syndrome) occurs following the release of pressure from a crushed limb, leading to systemic manifestations. **Why Renal Failure is the Correct Answer:** The hallmark of crush syndrome is **Rhabdomyolysis**. When muscle tissue is crushed and then reperfused, large amounts of **Myoglobin** are released into the circulation. Myoglobin is nephrotoxic; it causes Acute Kidney Injury (AKI) through three mechanisms: 1. **Direct tubular toxicity.** 2. **Intratubular cast formation** (obstructing the nephron). 3. **Renal vasoconstriction** leading to ischemia. This often results in "Tea-colored" or "Cola-colored" urine and is the most significant life-threatening complication. **Why Other Options are Incorrect:** * **B. Liver failure:** While systemic inflammatory response syndrome (SIRS) can occur, the liver is not the primary target organ in crush injuries. * **C. Cardiac failure:** While hyperkalemia (released from damaged cells) can cause **cardiac arrhythmias** or arrest, primary pump failure (cardiac failure) is not the standard complication of the syndrome itself. * **D. Endocrine crisis:** Crush syndrome involves metabolic disturbances (acidosis, hyperkalemia, hypocalcemia), but it does not typically trigger an acute endocrine crisis (like Addisonian or Thyroid storm). **High-Yield Clinical Pearls for NEET-PG:** * **Early Management:** Aggressive fluid resuscitation (Normal Saline) is the most important step to prevent renal failure. * **Urine Alkalinization:** Sodium Bicarbonate is used to prevent myoglobin precipitation in tubules. * **Electrolyte Triad:** Hyperkalemia, Hyperphosphatemia, and Hypocalcemia. * **Compartment Syndrome:** Often precedes or accompanies crush syndrome; definitive treatment is fasciotomy if pressures are elevated.

Question 44: A 25-year-old male presents with abdominal pain following blunt abdominal trauma sustained in a road traffic accident. On examination, his blood pressure is 120/80 mmHg and pulse rate is 72 bpm. What is the next best step in the management of this patient?

A. Diagnostic Peritoneal Lavage
B. Focused Assessment with Sonography for Trauma (FAST) scan (Correct Answer)
C. Non-contrast computed tomography (NCCT) of the abdomen
D. Contrast-enhanced computed tomography (CECT) of the abdomen

Explanation: **Explanation:** The management of blunt abdominal trauma (BAT) is primarily dictated by the patient's **hemodynamic stability**. In this scenario, the patient is hemodynamically stable (BP 120/80 mmHg, Pulse 72 bpm). **Why FAST is the correct answer:** According to the ATLS guidelines, **Focused Assessment with Sonography for Trauma (FAST)** is the initial screening investigation of choice for all patients with blunt abdominal trauma, regardless of stability. It is rapid, non-invasive, and highly sensitive for detecting free intraperitoneal fluid (hemoperitoneum). In a stable patient, a positive FAST scan warrants further characterization of injuries via CT, while a negative FAST allows for continued observation or further investigation. **Why other options are incorrect:** * **Diagnostic Peritoneal Lavage (DPL):** This is an invasive procedure primarily reserved for hemodynamically **unstable** patients when FAST is unavailable or inconclusive. It has been largely replaced by FAST. * **NCCT Abdomen:** Non-contrast CT has limited utility in trauma as it cannot accurately identify solid organ injuries or vascular extravasation. * **CECT Abdomen:** While CECT is the **Gold Standard** for identifying the specific organ of injury and grading it, it is typically performed *after* the initial screening (FAST) in stable patients to further delineate the injury. In many exam patterns, FAST is considered the "next best step" (initial), while CECT is the "investigation of choice" for definitive diagnosis in stable patients. **Clinical Pearls for NEET-PG:** * **Hemodynamically Unstable + Positive FAST:** Proceed to Immediate Laparotomy. * **Hemodynamically Stable + Positive FAST:** Proceed to CECT Abdomen (to decide on conservative vs. surgical management). * **FAST Windows:** Pericardial, Perihepatic (Morison’s pouch), Perisplenic, and Pelvic (Pouch of Douglas). * **Limitation of FAST:** It cannot detect retroperitoneal hemorrhage or hollow viscus perforation accurately.

Question 45: What is the first management step for a patient with a suspected cervical spine fracture?

A. Intubation
B. Cervical spine immobilization (Correct Answer)
C. X-ray of the spine
D. Tracheostomy

Explanation: **Explanation:** The management of a trauma patient follows the **ATLS (Advanced Trauma Life Support)** protocol. In any patient with a suspected cervical spine (C-spine) injury—particularly those with blunt trauma above the clavicle, a high-velocity mechanism, or altered mental status—the absolute first step is **Cervical Spine Immobilization**. **Why B is correct:** The primary goal is to prevent secondary spinal cord injury. Any movement of an unstable fracture can lead to permanent neurological deficit or respiratory arrest (if the injury is above C3-C5). Immobilization is achieved using a rigid cervical collar, lateral sandbags, and tape, or manual in-line stabilization (MILS) during airway maneuvers. **Why the other options are incorrect:** * **A. Intubation:** While "Airway" is the first priority in the ABCDE sequence, it must be managed **simultaneously** with C-spine protection. If intubation is required, it must be done using MILS to prevent neck extension. * **C. X-ray of the spine:** Imaging is part of the "Secondary Survey" or the adjuncts to the primary survey. Clinical stabilization always precedes radiological diagnosis. * **D. Tracheostomy:** This is a surgical airway used only if endotracheal intubation fails or is contraindicated (e.g., massive facial trauma). It is not a first-line step for C-spine fractures. **Clinical Pearls for NEET-PG:** * **Nexus Criteria & Canadian C-Spine Rules:** Used to clinically rule out the need for imaging. * **Imaging of Choice:** MDCT (Multidetector CT) from the occiput to T1 is now the gold standard, replacing the 3-view X-ray series. * **Airway Management:** If a C-spine injury is suspected and the airway is compromised, **Orotracheal intubation with Manual In-Line Stabilization (MILS)** is the preferred method. Avoid hyperextension of the neck.

Question 46: What is the investigation of choice for the evaluation of upper abdominal trauma?

A. Ultrasound (USG)
B. Computed Tomography (CT) (Correct Answer)
C. Scintigraphy
D. Magnetic Resonance Imaging (MRI)

Explanation: **Explanation:** **Contrast-Enhanced Computed Tomography (CECT)** is the investigation of choice (Gold Standard) for evaluating upper abdominal trauma in **hemodynamically stable** patients. Its superiority lies in its high sensitivity and specificity for identifying the exact grade of solid organ injuries (liver, spleen, kidneys), detecting retroperitoneal injuries, and identifying active extravasation of contrast ("blush"), which guides the decision between conservative management and surgical intervention. **Analysis of Options:** * **Ultrasound (FAST):** While Focused Assessment with Sonography for Trauma (FAST) is the initial screening tool used in the emergency room, it is limited. It can detect free intraperitoneal fluid (hemoperitoneum) but cannot accurately grade organ injury or visualize the retroperitoneum. It is the investigation of choice for **hemodynamically unstable** patients. * **Scintigraphy:** Nuclear medicine scans have no role in the acute management of trauma due to their time-consuming nature and poor anatomical resolution. * **MRI:** Although highly detailed, MRI is impractical in trauma settings due to long scan times, difficulty in monitoring the patient inside the magnet, and incompatibility with metallic resuscitation equipment. **Clinical Pearls for NEET-PG:** * **Hemodynamically Stable + Blunt Trauma:** CECT is the best investigation. * **Hemodynamically Unstable + Blunt Trauma:** FAST or Diagnostic Peritoneal Lavage (DPL) is preferred. * **Hollow Viscus Injury:** CT is less sensitive for bowel/mesenteric injuries compared to solid organ injuries; look for "free air" or "thickened bowel loops." * **Grade of Injury:** The AAST (American Association for the Surgery of Trauma) grading for liver and spleen is primarily based on CT findings.

Question 47: All of the following are features of Systemic Inflammatory Response Syndrome (SIRS) except?

A. WBC count > 11,000/mm3 or < 4,000/mm3
B. Temperature > 38°C
C. Pulse rate > 90/minute
D. Respiratory rate > 24/minute and PaCO2 < 22 mmHg (Correct Answer)

Explanation: ### Explanation The **Systemic Inflammatory Response Syndrome (SIRS)** is a clinical syndrome resulting from a dysregulated inflammatory cascade, often triggered by trauma, burns, pancreatitis, or infection. To diagnose SIRS, at least **two** of the following four criteria must be met: 1. **Temperature:** $> 38^\circ\text{C}$ ($100.4^\circ\text{F}$) or $< 36^\circ\text{C}$ ($96.8^\circ\text{F}$). 2. **Heart Rate:** $> 90$ beats per minute. 3. **Respiratory Rate:** $> 20$ breaths per minute **OR** **PaCO2** $< 32\text{ mmHg}$. 4. **WBC Count:** $> 12,000/\text{mm}^3$, $< 4,000/\text{mm}^3$, or $> 10\%$ immature (band) forms. **Why Option D is the Correct Answer (The "Except"):** The criteria for SIRS specify a respiratory rate of **$> 20$ breaths/minute** and a **PaCO2 of $< 32\text{ mmHg}$**. Option D provides incorrect numerical thresholds ($> 24$ and $< 22$), making it the outlier. **Analysis of Other Options:** * **Option A:** Correctly reflects the leukocytosis or leukopenia thresholds (though some texts use $12,000$, $11,000$ is often cited in clinical variations; however, the error in Option D is more definitive). * **Option B:** Correctly identifies the febrile threshold for SIRS. * **Option C:** Correctly identifies tachycardia ($> 90$ bpm) as a core criterion. ### High-Yield Clinical Pearls for NEET-PG: * **Sepsis vs. SIRS:** Sepsis is defined as SIRS + a documented or suspected source of infection. * **qSOFA Score:** In recent years, the Sepsis-3 guidelines emphasize the **qSOFA score** (Altered mental status, Systolic BP $\leq 100\text{ mmHg}$, RR $\geq 22/\text{min}$) over SIRS for predicting poor outcomes in sepsis. * **PaCO2 Logic:** Tachypnea leads to "blowing off" CO2, resulting in respiratory alkalosis; hence, a *low* PaCO2 ($< 32$) is the marker, not a high one.

Question 48: What is the meaning of the French word "debridement"?

A. Cut open (Correct Answer)
B. Debulk
C. Sanitize
D. Rehydration

Explanation: **Explanation:** The term **"Debridement"** is derived from the French word *débridement*, which literally means **"to unbridle"** or **"to cut open"** (from *dé-* 'un-' + *bride* 'bridle'). In a surgical context, it refers to the act of incising constricting bands of tissue or opening a wound to explore its depths. While modern clinical usage often equates debridement with the removal of necrotic, infected, or foreign material to promote healing, the **etymological origin** specifically refers to the act of "cutting open" or releasing tension. **Analysis of Options:** * **A. Cut open (Correct):** This is the literal translation. In trauma surgery, this involves opening the wound or fascia to relieve pressure and expose the underlying anatomy. * **B. Debulk:** This refers to the surgical reduction of the size of a tumor (cytoreduction), not the initial opening of a wound. * **C. Sanitize:** While debridement helps in cleaning a wound, "sanitize" refers to the reduction of microbial populations (disinfection), which is a chemical or mechanical process rather than the act of cutting. * **D. Rehydration:** This refers to the restoration of fluid balance and has no linguistic or surgical connection to debridement. **Clinical Pearls for NEET-PG:** * **Biological Debridement:** Uses sterile maggots (*Lucilia sericata*) which secrete enzymes that dissolve necrotic tissue while sparing healthy tissue. * **Enzymatic Debridement:** Uses topical agents like Collagenase. * **Surgical Debridement:** The "Gold Standard" for contaminated trauma wounds; it follows the principle of converting a "dirty" wound into a "clean" surgical wound. * **Priority:** In trauma (e.g., gas gangrene or compartment syndrome), the primary goal of debridement is the release of tension and removal of the "nidus" of infection.

Question 49: A patient with a stab injury to the anterior abdomen presents with a tag of omentum protruding the abdominal wall near the umbilicus. On evaluation, he is hemodynamically stable and shows no signs of peritonitis. What should be the initial management?

A. FAST scan
B. Exploratory laparotomy
C. Local wound exploration and suturing
D. CECT Abdomen (Correct Answer)

Explanation: **Explanation:** The management of penetrating abdominal trauma (PAT) depends on hemodynamic stability and clinical findings. In this scenario, the patient is **hemodynamically stable** and has **no signs of peritonitis**, but the presence of omental evisceration confirms that the peritoneum has been breached. **Why CECT Abdomen is the correct answer:** According to current trauma guidelines (e.g., Eastern Association for the Surgery of Trauma), stable patients with penetrating injuries who do not have an immediate indication for surgery (like shock or peritonitis) should undergo a **Contrast-Enhanced Computed Tomography (CECT)**. CECT is highly sensitive for identifying solid organ injuries, retroperitoneal trauma, and can help determine if the patient can be managed non-operatively. While evisceration traditionally mandated laparotomy, modern practice allows for CECT in stable patients to avoid unnecessary "non-therapeutic" surgeries. **Analysis of Incorrect Options:** * **FAST scan:** Primarily used in blunt trauma or unstable patients to detect free fluid. It has low sensitivity for hollow viscus or solid organ injuries in stable penetrating trauma. * **Exploratory laparotomy:** Indicated if the patient was hemodynamically unstable, had peritonitis, or if CECT showed injuries requiring repair. Evisceration alone in a stable patient is no longer an absolute indication for immediate surgery in many centers. * **Local wound exploration (LWE):** LWE is used to see if the peritoneum is breached. Since omentum is already protruding, the breach is confirmed; LWE would provide no additional diagnostic value. **Clinical Pearls for NEET-PG:** * **Absolute indications for Laparotomy in PAT:** Hemodynamic instability, peritonitis, or impalement. * **Stab vs. Gunshot:** Gunshot wounds (GSW) have a much higher incidence of internal injury (>90%) and usually require laparotomy, whereas stab wounds are managed more selectively. * **The "Golden Rule":** If a stable patient has a peritoneal breach (evisceration), the next step is to "stage" the injury using CECT to decide between conservative management or surgery.

Question 50: What is the least percentage of blood volume loss required to cause hemorrhagic shock?

A. 30%
B. 40%
C. 20% (Correct Answer)
D. 50%

Explanation: ### Explanation The classification of hemorrhagic shock is based on the **ATLS (Advanced Trauma Life Support)** guidelines, which categorize blood loss into four stages. **Why 20% is the correct answer:** Hemorrhagic shock is clinically defined as a state of cellular hypoxia due to reduced perfusion. While **Class I shock** involves loss of up to 15% of blood volume (usually compensated with minimal symptoms), **Class II shock** begins when blood loss exceeds **15% (ranging from 15% to 30%)**. At this threshold—specifically around **20%**—the body’s compensatory mechanisms (like tachycardia and narrowed pulse pressure) become clinically evident. Therefore, 20% represents the minimum significant threshold where the physiological signs of shock (Class II) are established. **Analysis of Incorrect Options:** * **30% (Option A):** This marks the transition from Class II to **Class III shock**. At this stage, classic signs like hypotension and marked mental status changes appear. It is a state of shock, but not the *least* percentage required. * **40% (Option B):** This represents **Class IV shock**, which is life-threatening and requires immediate massive transfusion. * **50% (Option D):** This is extreme exsanguination, far exceeding the initial threshold for shock. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign of Shock:** Tachycardia (Heart Rate >100 bpm). * **Earliest Sign of Class III Shock:** Hypotension (Fall in systolic BP). * **Pulse Pressure:** It narrows in Class II shock due to a rise in diastolic pressure (catecholamine response). * **Urine Output:** It remains normal in Class I and II but drops significantly (<15-20 ml/hr) in Class III. * **Fluid Management:** Class I and II usually respond to crystalloids; Class III and IV require blood products.

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Trauma — MCQs

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