Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 701: A burn involving one lower limb in an adult corresponds to what percentage of the total body surface area?

A. 4.50%
B. 9%
C. 13.50%
D. 18% (Correct Answer)

Explanation: ### Explanation The correct answer is **18%**. This question is based on the **Wallace Rule of Nines**, a standardized clinical tool used to estimate the Total Body Surface Area (TBSA) affected by burns in adults. This estimation is critical for calculating fluid resuscitation requirements using the Parkland Formula. **Why 18% is correct:** According to the Rule of Nines, the body is divided into sections representing 9% or multiples of 9%: * **Each Lower Limb:** 18% (9% for the anterior surface and 9% for the posterior surface). * **Each Upper Limb:** 9% (4.5% anterior, 4.5% posterior). * **Anterior Trunk:** 18%. * **Posterior Trunk:** 18%. * **Head and Neck:** 9%. * **Perineum/Genitalia:** 1%. **Analysis of Incorrect Options:** * **4.50%:** This represents the anterior (or posterior) surface of one **upper limb** or the anterior (or posterior) surface of the **head**. * **9%:** This represents the **entire head** or **one entire upper limb**. * **13.50%:** This is not a standard figure in the adult Rule of Nines, though it is used in the **Lund and Browder chart** for the thigh/leg of specific pediatric age groups. **Clinical Pearls for NEET-PG:** 1. **Pediatric Variation:** In infants, the head is larger (18%) and the lower limbs are smaller (14% each). For every year of age over 1, subtract 1% from the head and add 0.5% to each leg. 2. **Palmar Method:** For small or patchy burns, the patient’s entire palm (including fingers) represents approximately **1% TBSA**. 3. **Exclusion:** When calculating TBSA for fluid resuscitation, **first-degree burns (erythema)** are excluded; only second and third-degree burns are counted.

Question 702: Epiphora is seen in all of the following except:

A. Lefort 2 fracture
B. Zygomatic complex fracture (Correct Answer)
C. Lefort 3 fracture
D. Nasal complex fracture

Explanation: **Explanation:** **Epiphora** (overflow of tears) in mid-facial trauma is primarily caused by damage to the **nasolacrimal apparatus** (lacrimal sac or nasolacrimal duct). The nasolacrimal duct is located medially, passing through the bony canal formed by the maxilla, lacrimal, and inferior nasal concha bones. * **Why Zygomatic Complex (ZMC) Fracture is the correct answer:** ZMC fractures involve the lateral orbit and the malar prominence. Since the nasolacrimal system is situated medially, isolated ZMC fractures typically do not involve the medial orbital wall or the nasal bones, thus sparing the lacrimal drainage system. * **LeFort II (Pyramidal) and LeFort III (Craniofacial Dysjunction):** Both these fractures involve the **medial orbital wall** and the nasal bridge. The fracture lines pass directly through the area of the nasolacrimal canal, frequently leading to ductal obstruction or transection, resulting in epiphora. * **Nasal Complex/Naso-ethmoid-orbital (NEO) Fractures:** These are the most common cause of traumatic epiphora. The comminution of the ethmoid and nasal bones directly disrupts the lacrimal sac and the ductal system. **High-Yield Clinical Pearls for NEET-PG:** 1. **Telecanthus:** Often seen in NEO fractures due to displacement of the medial canthal ligament; frequently co-exists with epiphora. 2. **Dish-face deformity:** Characteristic of LeFort II and III fractures due to midface retrusion. 3. **Step-off deformity:** In ZMC fractures, this is most commonly palpated at the **infraorbital rim** or the zygomaticomaxillary buttress. 4. **Jones Test:** Used clinically to evaluate the patency of the nasolacrimal drainage system.

Question 703: Signature fracture of the skull is commonly seen in which type of fracture?

A. Gutter fracture
B. Depressed fracture (Correct Answer)
C. Ring fracture
D. Sutural separation

Explanation: **Explanation:** **Signature fractures** (also known as "patterned fractures") are a specific subtype of **depressed skull fractures**. They occur when the skull is struck by a heavy object with a small striking surface (e.g., a hammer, brick, or pipe). The bone is driven inward, mirroring the shape and dimensions of the impacting object. This "signature" allows forensic experts and surgeons to identify the weapon used, making it highly significant in medico-legal cases. **Analysis of Options:** * **Gutter Fracture (Option A):** This is a type of depressed fracture caused by a tangential (oblique) impact, often by a bullet. It creates a furrow or "gutter" in the bone rather than a distinct signature of the object. * **Ring Fracture (Option C):** This occurs at the base of the skull around the foramen magnum. It is typically caused by a fall from a height (landing on feet/buttocks) or a heavy blow to the vertex, driving the skull base onto the vertebral column. * **Sutural Separation (Option D):** Also known as traumatic diastasis, this involves the widening of cranial sutures, commonly seen in pediatric head trauma before the sutures have fully fused. **High-Yield Pearls for NEET-PG:** * **Pond Fracture:** A shallow, indented depressed fracture seen in infants (greenstick-like) due to the pliability of the skull. * **Elevated Fracture:** A rare type where a portion of the skull is lifted above the level of the intact vault (e.g., by a blow from a sharp weapon like a machete). * **Surgical Indication:** Depressed fractures usually require surgical elevation if the depression is greater than the thickness of the adjacent intact skull or if there is an underlying dural tear/brain injury.

Question 704: What is the first sign of compartment syndrome?

A. Pain (Correct Answer)
B. Tingling
C. Loss of pulse
D. Loss of movement

Explanation: **Explanation:** Compartment syndrome occurs when increased pressure within a closed osteofascial space compromises local circulation and tissue function. **1. Why Pain is the Correct Answer:** **Pain** is the **earliest and most sensitive clinical sign** of compartment syndrome. Specifically, the pain is typically "out of proportion" to the injury and is characteristically exacerbated by **passive stretching** of the muscles within the affected compartment. This occurs because the rising pressure causes early ischemic irritation of the sensory nerves. **2. Analysis of Incorrect Options:** * **B. Tingling (Paresthesia):** This is often the second sign to appear, indicating early nerve ischemia. While important, it usually follows the onset of severe pain. * **C. Loss of Pulse (Pulselessness):** This is a **late and ominous sign**. Because the intracompartmental pressure rarely exceeds systolic arterial pressure, pulses often remain palpable even when the tissue is severely ischemic. Waiting for pulselessness to diagnose compartment syndrome often leads to irreversible limb damage. * **D. Loss of Movement (Paralysis):** This is also a **late sign** indicating significant muscle necrosis and nerve damage. **Clinical Pearls for NEET-PG:** * **The 6 P’s:** Pain (earliest), Paresthesia, Pallor, Poikilothermia, Paralysis, and Pulselessness (latest). * **Diagnosis:** Primarily clinical. However, if the diagnosis is doubtful, intracompartmental pressure can be measured (e.g., using a Stryker monitor). * **Critical Threshold:** A **Delta pressure** (Diastolic BP – Compartment pressure) of **≤ 30 mmHg** is an indication for emergency fasciotomy. * **Most Common Site:** The **anterior compartment of the leg** (often following a tibial fracture). * **Treatment:** Emergency **fasciotomy** to decompress all involved compartments.

Question 705: Which of the following causes staining of a burnt area?

A. Sulfamylon
B. Povidone iodine
C. Silver nitrate (Correct Answer)
D. Mafenide

Explanation: **Explanation:** **Silver nitrate (0.5% aqueous solution)** is a classic topical antimicrobial used in burn care. Its primary disadvantage, and the reason it is the correct answer, is that it **precipitates as silver salts** upon contact with surface proteins and chloride in the wound. This reaction causes a characteristic **black staining** of the burn wound, surrounding skin, and even bed linens. While it is effective against *Staphylococcus* and *Pseudomonas*, its use has declined due to this staining (which obscures wound assessment) and its tendency to cause electrolyte imbalances (hyponatremia and hypochloremia) via leaching. **Analysis of Incorrect Options:** * **Sulfamylon (Mafenide acetate):** This is a carbonic anhydrase inhibitor. While it is excellent for penetrating thick eschar and cartilage (e.g., ear burns), it does not cause staining. Its main side effects are metabolic acidosis and pain on application. * **Povidone-iodine:** While the solution itself is brown, it is water-soluble and does not permanently "stain" the wound bed in a way that interferes with long-term clinical evaluation like silver nitrate does. It is also rarely used as a primary long-term topical agent in major burns due to potential systemic iodine toxicity. * **Mafenide:** (Same as Sulfamylon). **High-Yield Clinical Pearls for NEET-PG:** * **Silver Sulfadiazine (SSD):** The most common topical agent; does not stain, but can cause **transient leukopenia** (neutropenia). * **Mafenide Acetate:** Best for **eschar penetration**; watch for **metabolic acidosis**. * **Silver Nitrate:** Causes **black staining** and **hyponatremia/hypochloremia**. * **Silver Nitrate Concentration:** Must be used at **0.5%**; higher concentrations are caustic to tissues.

Question 706: What is considered the golden hour for a femur fracture?

A. 1 hour after injury (Correct Answer)
B. 1 hour prior to injury
C. 1 hour after reaching the hospital
D. 1 hour after surgical procedure

Explanation: **Explanation:** The concept of the **"Golden Hour"** in trauma refers to the critical period immediately following a traumatic injury during which the prompt provision of definitive care (resuscitation and stabilization) significantly increases the patient’s chances of survival and reduces morbidity. **1. Why Option A is Correct:** The "Golden Hour" begins at the **moment of injury**, not when the patient reaches medical help. For a femur fracture, this period is vital because the femur is a highly vascular bone. A closed femoral shaft fracture can result in internal blood loss of **500 ml to 1500 ml**, potentially leading to hemorrhagic shock. Intervening within the first hour—by stabilizing the fracture, managing pain, and initiating fluid resuscitation—prevents the "lethal triad" of acidosis, coagulopathy, and hypothermia. **2. Why Other Options are Incorrect:** * **Option B:** Time prior to injury is clinically irrelevant to the physiological response to trauma. * **Option C:** Waiting until the patient reaches the hospital ignores the "Platinum Ten Minutes" (the time limit for EMS to stabilize and transport). If transport takes 50 minutes, only 10 minutes of the Golden Hour remain upon arrival. * **Option D:** Surgical procedures often occur hours or days later (e.g., intramedullary nailing). The Golden Hour focuses on initial resuscitation and stabilization to make the patient fit for surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Blood Loss:** Femur fracture (1–1.5L), Pelvic fracture (2L+), Tibia fracture (500–750ml). * **First Priority:** In femur fractures, the immediate application of a **Thomas Splint** reduces pain, prevents further soft tissue/vascular damage, and tamponades internal bleeding. * **Fat Embolism Syndrome:** A classic complication of long bone fractures (femur), typically presenting 24–72 hours post-injury with a triad of dyspnea, confusion, and petechial rashes.

Question 707: Massive edema in a patient of burns is due to which of the following mechanisms?

A. Cardiac dysfunction due to release of cardiac depressants
B. Basement membrane injury causing altered pressure gradient (Correct Answer)
C. Acute Renal failure
D. Fluid overload

Explanation: **Explanation** The pathophysiology of edema in major burns is a complex, multifactorial process primarily driven by **microvascular injury**. **1. Why Option B is Correct:** In severe burns, direct thermal injury and the systemic inflammatory response lead to significant damage to the **capillary basement membrane**. This results in: * **Increased Capillary Permeability:** The "sieving" function of the basement membrane is lost, allowing large plasma proteins (albumin) to leak into the interstitial space. * **Altered Pressure Gradients:** The loss of proteins reduces the *Intravascular Oncotic Pressure* and increases the *Interstitial Oncotic Pressure*. This shift, combined with an increase in capillary hydrostatic pressure, forces massive amounts of fluid out of the vessels, leading to profound edema. **2. Why Other Options are Incorrect:** * **Option A:** While "Burn Shock" involves cardiac depressant factors (like TNF-α) that reduce contractility, this leads to decreased cardiac output and hypotension, not primary massive edema. * **Option C:** Acute Renal Failure (ARF) in burns is usually a *consequence* of hypovolemia (pre-renal) or myoglobinuria. While ARF can cause fluid retention later, the immediate massive edema post-burn is due to capillary leak. * **Option D:** Fluid overload can exacerbate edema during resuscitation (iatrogenic), but the *pathological mechanism* inherent to the burn injury itself is the basement membrane disruption. **NEET-PG High-Yield Pearls:** * **Baxter (Parkland) Formula:** $4 \text{ ml} \times \text{Body Weight (kg)} \times \% \text{ TBSA}$ is used for fluid resuscitation. * **Maximum Edema:** Occurs at 8–12 hours in small burns and 12–24 hours in major burns. * **Rule of nines:** Used for quick assessment of TBSA (Total Body Surface Area). * **Fluid of Choice:** Ringer’s Lactate is the preferred crystalloid in the first 24 hours.

Question 708: What is the typical amount of blood loss associated with Class II hemorrhagic shock?

A. Less than 15% of total blood volume
B. 15-30% of total blood volume (Correct Answer)
C. 30-40% of total blood volume
D. Greater than 40% of total blood volume

Explanation: The classification of hemorrhagic shock is a high-yield topic based on the **ATLS (Advanced Trauma Life Support)** guidelines. It categorizes blood loss into four stages based on physiological changes in a 70kg adult. ### **Explanation of the Correct Answer** **Option B (15–30%)** is correct for **Class II (Mild) Shock**. At this stage, the body initiates compensatory mechanisms. While the blood pressure is usually maintained (normotensive), the patient begins to show signs of sympathetic activation, such as **tachycardia** (HR >100 bpm) and a **narrowed pulse pressure** (due to increased diastolic pressure from peripheral vasoconstriction). ### **Analysis of Incorrect Options** * **Option A (<15%):** Corresponds to **Class I Shock**. This is similar to a standard blood donation. Vital signs remain stable, and the body compensates easily without the need for crystalloid resuscitation. * **Option C (30–40%):** Corresponds to **Class III (Moderate) Shock**. This is the critical stage where compensatory mechanisms fail, leading to **hypotension** (drop in systolic BP) and significant tachypnea. * **Option D (>40%):** Corresponds to **Class IV (Severe) Shock**. This is a life-threatening emergency characterized by profound hypotension, negligible urine output, and altered mental status (lethargy/coma). ### **NEET-PG High-Yield Pearls** 1. **First Sign of Shock:** Tachycardia is typically the earliest measurable sign. 2. **Pulse Pressure:** It narrows in Class II but significantly drops in Class III. 3. **Urine Output:** It remains normal (20-30 mL/hr) in Class II but decreases (<15 mL/hr) in Class III. 4. **Management Rule:** Class I and II usually respond to crystalloids; Class III and IV require blood products (Massive Transfusion Protocol).

Question 709: What is the term 'Telefono' used to describe in the context of physical abuse?

A. Pulling of hair
B. Beating on soles
C. Beating on ears (Correct Answer)
D. Beating on fingers

Explanation: **Explanation:** In the context of physical abuse and forensic traumatology, **'Telefono'** (Spanish for "telephone") refers to a specific method of torture or abuse where a person is struck with cupped hands simultaneously on both ears. **1. Why 'Beating on ears' is correct:** The term describes the mechanism of slapping both ears at once. This action creates a sudden, massive increase in air pressure within the external auditory canal. This pneumatic pressure often results in the **traumatic rupture of the tympanic membrane** (eardrum) and can lead to permanent sensorineural hearing loss, vertigo, or chronic otitis media. It is a recognized form of physical abuse used to disorient victims without leaving obvious external marks. **2. Why other options are incorrect:** * **Pulling of hair:** This is known as **Trichotillomania** (self-induced) or simply scalp trauma/avulsion in abuse, but it has no specific eponymous term like Telefono. * **Beating on soles:** This is known as **Falanga** (or Bastinado). It involves rhythmic beating of the soles of the feet, causing deep tissue injury and compartment syndrome without breaking the skin. * **Beating on fingers:** While common in abuse, it does not have a specific clinical term associated with "Telefono." **Clinical Pearls for NEET-PG:** * **Falanga:** Beating on soles (High-yield for forensic medicine). * **Traumatic Myoglobinuria:** Can occur following extensive soft tissue beating (like Falanga). * **Tympanic Membrane Rupture:** Most common site is the pars tensa. * **Greeley’s Sign:** Ecchymosis over the mastoid process (Battle sign) or similar trauma indicators are often tested alongside abuse patterns.

Question 710: All of the following are true about Overwhelming Postsplenectomy Infection (OPSI), EXCEPT:

A. Maximum risk is within 2 years of splenectomy (Correct Answer)
B. Often begins with a mild-appearing prodrome
C. May present with septic shock
D. Usually responds well to prompt antibiotic treatment

Explanation: **Explanation:** **Overwhelming Postsplenectomy Infection (OPSI)** is a life-threatening medical emergency characterized by a rapid progression from minor symptoms to fulminant sepsis. **1. Why Option D is the "Except" (Correct Answer):** Despite prompt antibiotic treatment, OPSI has an extremely high mortality rate, ranging from **50% to 70%**. The clinical course is so aggressive (death can occur within 24–48 hours) that even with intensive care and intravenous antibiotics, the prognosis remains poor. Therefore, saying it "responds well" is clinically inaccurate. **2. Analysis of Other Options:** * **Option A:** The risk of OPSI is lifelong, but the **maximum risk (approx. 50–80% of cases) occurs within the first 2 years** following splenectomy. * **Option B:** It typically begins with a **non-specific, mild prodrome** (fever, malaise, myalgia, vomiting), which often leads to a dangerous delay in diagnosis. * **Option C:** The condition rapidly progresses to **septic shock**, disseminated intravascular coagulation (DIC), and multi-organ failure. Waterhouse-Friderichsen syndrome (adrenal hemorrhage) is a known complication. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Organism:** *Streptococcus pneumoniae* (50–90% of cases). Other organisms include *H. influenzae* type B and *N. meningitidis*. * **Incidence:** Highest in children (especially those splenectomized for hematologic disorders like Thalassemia) compared to adults (trauma). * **Prevention (The Rule of 2):** * Vaccinate **2 weeks before** elective surgery or **2 weeks after** emergency surgery. * Prophylactic Penicillin is recommended (usually until age 5 in children or for at least 2 years post-op in adults). * **Peripheral Smear:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies.

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