Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 641: Which of the following is NOT a feature of neurogenic shock?

A. Decreased cardiac index
B. Decreased peripheral vascular resistance
C. Decreased venous capacitance (Correct Answer)
D. Decreased cardiac output

Explanation: ### Explanation **Neurogenic shock** occurs due to the loss of sympathetic vasomotor tone, typically following a high spinal cord injury (above T6). This leads to massive vasodilation and a characteristic "warm shock" presentation. **Why "Decreased venous capacitance" is the correct answer:** In neurogenic shock, the loss of sympathetic signals causes the smooth muscles in the vein walls to relax. This results in **increased venous capacitance** (the veins hold more blood), leading to peripheral venous pooling and a functional decrease in preload. Therefore, saying there is "decreased" capacitance is physiologically incorrect. **Analysis of Incorrect Options:** * **Decreased peripheral vascular resistance (PVR):** Loss of sympathetic tone causes profound arterial vasodilation, which directly lowers PVR. This is a hallmark of neurogenic shock. * **Decreased cardiac index & cardiac output:** Due to the increase in venous capacitance, venous return to the heart (preload) drops significantly. According to the Frank-Starling law, reduced preload leads to a decrease in stroke volume, subsequently lowering the cardiac output and cardiac index. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Triad:** Hypotension, **Bradycardia** (due to unopposed vagal tone), and peripheral vasodilation (warm, dry skin). * **Neurogenic vs. Spinal Shock:** Neurogenic shock is a *hemodynamic* phenomenon; Spinal shock is a *neurological* phenomenon (loss of reflexes/flaccid paralysis). * **Management:** Initial treatment is aggressive fluid resuscitation to fill the "expanded" vascular space, followed by vasopressors (e.g., Norepinephrine or Phenylephrine) if hypotension persists. Atropine may be used for symptomatic bradycardia.

Question 642: What does flail chest refer to?

A. Fracture of the sternum
B. Fracture of multiple ribs (Correct Answer)
C. Open pneumothorax
D. Tension pneumothorax

Explanation: **Explanation:** **Flail Chest** is a clinical diagnosis defined by the fracture of **three or more adjacent ribs in two or more places**. This creates a segment of the chest wall that is no longer in bony continuity with the rest of the thoracic cage. **Why Option B is Correct:** The hallmark of flail chest is **paradoxical respiration**. During inspiration, the negative intra-thoracic pressure causes the "flail segment" to be sucked inward, while during expiration, it is pushed outward. This leads to inefficient ventilation and severe pain. However, the primary cause of hypoxia in these patients is usually the underlying **pulmonary contusion** rather than the mechanical movement of the chest wall itself. **Why Other Options are Incorrect:** * **Option A:** A sternal fracture alone does not constitute a flail chest, though it can be part of a "central flail" if associated with bilateral rib fractures. * **Option C & D:** Open and tension pneumothoraces are pleural space pathologies involving air entry. While they may coexist with a flail chest in polytrauma, they are distinct clinical entities with different pathophysiological mechanisms. **High-Yield NEET-PG Pearls:** * **Diagnosis:** Primarily clinical (observation of paradoxical movement). * **Most Common Complication:** Pulmonary contusion (leads to V/Q mismatch). * **Management:** The priority is **adequate analgesia** (often epidural) and aggressive pulmonary toilet. * **Indications for Intubation:** Not all patients need a ventilator. Intubation is reserved for those with persistent hypoxia (PaO2 <60 mmHg), severe respiratory distress, or shock. * **Internal Stabilization:** Refers to positive pressure ventilation, which acts as a "pneumatic splint."

Question 643: During renal rupture, nephrectomy is NOT attempted until:

A. Fluid replacement is adequate
B. Antibiotics cover has been initiated
C. Contralateral renal function is ascertained (Correct Answer)
D. A renal angiogram has been performed

Explanation: **Explanation:** In the management of renal trauma, the primary goal is renal preservation. However, if life-threatening hemorrhage or extensive devitalization necessitates a nephrectomy, the most critical prerequisite is ensuring the presence and functionality of the **contralateral kidney**. **Why Option C is Correct:** Performing a nephrectomy on a patient with a solitary functioning kidney or bilateral renal agenesis would result in immediate, permanent renal failure requiring lifelong dialysis or transplant. In emergency trauma settings, this is traditionally confirmed via a **"One-shot IVP"** (Intravenous Pyelogram) on the operating table or preoperative CT imaging. This ensures that the patient can survive post-nephrectomy. **Why Other Options are Incorrect:** * **A & B:** While fluid resuscitation and antibiotics are standard components of trauma care, they are supportive measures. They do not dictate the surgical decision to remove an organ. * **D:** A renal angiogram is a diagnostic tool used for stable patients (e.g., to identify bleeding for embolization). In an emergency rupture requiring nephrectomy, waiting for an angiogram would cause fatal delays. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for Surgery in Renal Trauma:** Hemodynamic instability (most common), expanding/pulsatile hematoma, and Grade V vascular pedicle avulsion. * **The "One-Shot IVP":** Performed by injecting 2 ml/kg of non-ionic contrast followed by a single abdominal X-ray at 10 minutes to confirm a functional contralateral kidney. * **Grading:** Most renal injuries (Grades I-III and some IV) are managed **conservatively**. * **AAST Grading:** Grade V involves a completely shattered kidney or ureteropelvic avulsion.

Question 644: A 8-year-old child received contrast injection in the hand for CECT chest. Immediately, he developed swelling in the arm which gradually increased. After 4 hours, there was numbness and pain, and he was unable to flex his hand. Pulse is present. What is the most appropriate immediate management?

A. High dose prednisolone
B. Arterial thrombectomy
C. Immediate fasciotomy (Correct Answer)
D. Angiography

Explanation: ### **Explanation** The clinical presentation describes **Acute Compartment Syndrome (ACS)** secondary to **extravasation of contrast media**. **1. Why "Immediate Fasciotomy" is correct:** Contrast extravasation in a small child’s limb can rapidly increase interstitial pressure within the non-distensible fascial compartments. The progression from swelling to **numbness (paresthesia)** and **inability to flex the hand (motor weakness/paralysis)** indicates critical ischemia of nerves and muscles. * **Key Concept:** In ACS, the tissue pressure exceeds capillary perfusion pressure. While the **radial pulse is often still present** (as systolic pressure exceeds compartment pressure), the microcirculation is compromised. Immediate surgical decompression via **fasciotomy** is the definitive treatment to prevent irreversible tissue necrosis and Volkmann’s Ischemic Contracture. **2. Why other options are incorrect:** * **High-dose prednisolone:** While steroids are used for contrast-induced allergic reactions (anaphylaxis), they have no role in treating mechanical compression from extravasation. * **Arterial thrombectomy:** This is indicated for acute limb ischemia due to an embolus/thrombus. Here, the pulse is present, and the pathology is external compression of vessels, not an internal clot. * **Angiography:** This is a diagnostic tool for vascular injury. In ACS, the diagnosis is **clinical**, and delaying surgery for imaging can lead to permanent limb damage. ### **Clinical Pearls for NEET-PG:** * **Earliest Sign of ACS:** Pain out of proportion to injury and **pain on passive stretching** of muscles. * **Late Signs:** Pulselessness and paralysis (signify irreversible damage). * **Delta Pressure:** Diagnosis is confirmed if (Diastolic BP – Compartment Pressure) is **≤ 30 mmHg**. * **Contrast Extravasation:** Most cases are managed conservatively (elevation, warm/cold compresses), but surgical consultation is mandatory if >30ml of ionic contrast is extravasated or if neurovascular deficits develop.

Question 645: Which organs are most commonly affected by blast injuries?

A. Solid organs
B. Hollow viscera (Correct Answer)
C. Skeletal system
D. Muscles

Explanation: ### Explanation **Primary blast injuries** are caused by the direct effect of the blast overpressure wave on the body. This pressure wave specifically targets **air-tissue interfaces**, making **hollow viscera** the most commonly and severely affected organs. **Why Hollow Viscera?** When a high-pressure wave transitions between media of different densities (e.g., from solid tissue to air-filled cavities), it causes rapid compression and re-expansion. This leads to shearing, spalling, and implosion. The organs most vulnerable are: 1. **The Ear:** Tympanic membrane rupture (most common overall). 2. **The Lungs:** "Blast lung" (pulmonary contusion/hemorrhage), which is the most common cause of death among initial survivors. 3. **The GI Tract:** Most commonly the **cecum** and colon, leading to delayed perforation or hemorrhage. **Analysis of Incorrect Options:** * **A. Solid organs:** While solid organs (liver, spleen) can be injured in secondary (shrapnel) or tertiary (displacement) blast injuries, they are relatively resistant to the primary pressure wave because they lack air-tissue interfaces. * **C & D. Skeletal system and Muscles:** These are typically involved in **Tertiary blast injuries** (where the victim is thrown against an object) or **Quaternary injuries** (burns, crush injuries, or toxic inhalations). They are not the primary targets of the pressure wave itself. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organ injured:** Tympanic Membrane (TM). A normal TM usually rules out significant pulmonary blast injury. * **Most common cause of death:** Blast lung (presents with the triad of apnea, bradycardia, and hypotension). * **Management Tip:** Avoid over-resuscitation with fluids in blast lung to prevent worsening pulmonary edema; use lung-protective ventilation strategies. * **Delayed Presentation:** Abdominal hollow visceral injuries (like bowel perforation) can manifest 24–48 hours after the initial event.

Question 646: During resuscitation of a pediatric burn patient, what is the minimum required urine output?

A. 1 ml/kg/hr. (Correct Answer)
B. 3 ml/kg/hr.
C. 2 ml/kg/hr.
D. 4 ml/kg/hr.

Explanation: In burn management, urine output (UOP) is the most reliable clinical indicator of adequate end-organ perfusion and the success of fluid resuscitation. **Explanation of the Correct Answer:** For pediatric patients (weighing less than 30 kg), the goal for fluid resuscitation is to maintain a minimum urine output of **1 ml/kg/hr**. Children have a higher surface-area-to-body-mass ratio and limited physiological reserve compared to adults; therefore, precise monitoring is vital to prevent both under-resuscitation (leading to acute tubular necrosis) and over-resuscitation (leading to pulmonary edema or compartment syndrome). **Analysis of Incorrect Options:** * **0.5 ml/kg/hr (Adult Standard):** While not an option here, it is important to note that 0.5 ml/kg/hr is the target for **adults**. * **2 ml/kg/hr:** This is the target specifically for patients with **electrical burns** (both pediatric and adult) to flush out myoglobin and prevent pigment-induced nephropathy. * **3-4 ml/kg/hr:** These values are excessively high for routine thermal burns and would likely lead to "fluid creep" and systemic complications. **NEET-PG High-Yield Pearls:** * **Parkland Formula (Modified):** 4 ml × kg × %TBSA. In children, maintenance fluids (using the Holliday-Segar rule) must be added to the resuscitation volume. * **Preferred Fluid:** Ringer’s Lactate is the crystalloid of choice. In small children, D5RL may be used to prevent hypoglycemia. * **The "Rule of 10s":** A simplified method for initial fluid rates in burns. * **Galveston Formula:** Used specifically for pediatric burns based on Body Surface Area (BSA) rather than weight (2000 ml/m² BSA + 5000 ml/m² burned area).

Question 647: Accidental small splenic rupture is treated with?

A. Catgut sutures
B. Silk sutures
C. Omental patch
D. Catgut suturing with omental patch (Correct Answer)

Explanation: **Explanation:** The management of splenic trauma has shifted significantly toward **Splenic Salvage (Splenorrhaphy)** to avoid the lifelong risk of Overwhelming Post-Splenectomy Infection (OPSI). For accidental or minor iatrogenic splenic ruptures (Grade I or II), the goal is to achieve hemostasis while preserving the splenic parenchyma. **Why Option D is Correct:** The spleen is a highly vascular, friable (soft and easily torn) organ. Direct suturing alone often fails because the sutures tend to "cut through" the delicate splenic tissue when tightened. **Catgut suturing with an omental patch** is the preferred technique because: 1. **Catgut** is an absorbable material that minimizes long-term foreign body reaction. 2. The **Omental Patch (Graham’s patch principle)** acts as a biological "bolster" or cushion. It distributes the tension of the sutures across a wider surface area, preventing them from tearing through the parenchyma, while the omentum itself provides rich vascularity and macrophages to aid healing. **Analysis of Incorrect Options:** * **A & B (Sutures alone):** Using only sutures (Catgut or Silk) is risky in splenic surgery. Without a bolster, the sutures act like a "cheese-wire," cutting through the friable splenic capsule and potentially worsening the hemorrhage. * **B (Silk):** Silk is a non-absorbable, braided material. It is generally avoided in parenchymal repairs due to a higher risk of infection and tissue reaction compared to absorbable sutures. * **C (Omental patch alone):** While the omentum promotes healing, it must be secured in place with sutures to provide the necessary compression to stop active bleeding. **NEET-PG High-Yield Pearls:** * **Most common organ injured** in blunt trauma abdomen: Spleen. * **Most common cause of iatrogenic splenic injury:** Operations on the stomach (distal gastrectomy) or left colon. * **Kehr’s Sign:** Referred pain to the left shoulder due to diaphragmatic irritation by splenic blood. * **Splenorrhaphy techniques:** Include topical hemostatic agents (Surgicel), partial splenectomy, and omental wrapping (splenic wrap/sandwich).

Question 648: What is the minimum possible score on the Glasgow Coma Scale?

A. 3 (Correct Answer)
B. 5
C. 1
D. 0

Explanation: **Explanation:** The **Glasgow Coma Scale (GCS)** is a clinical tool used to assess a patient's level of consciousness following a head injury. It evaluates three specific categories of responses: **Eye Opening (E), Verbal Response (V), and Motor Response (M).** 1. **Why Option A is Correct:** The minimum score for each component is **1**, not 0. * Minimum Eye Opening (E) = 1 (No response) * Minimum Verbal Response (V) = 1 (No response) * Minimum Motor Response (M) = 1 (No response) Therefore, the lowest possible cumulative score is **E1 + V1 + M1 = 3**. A score of 3 indicates a state of deep coma or brain death. 2. **Why Other Options are Incorrect:** * **Options C & D (1 and 0):** These are common distractors. In the GCS scoring system, "no response" is assigned a value of 1, never 0. Thus, a total score of 0 or 1 is mathematically impossible. * **Option B (5):** While a score of 5 represents a severe brain injury, it is not the mathematical minimum of the scale. **High-Yield Clinical Pearls for NEET-PG:** * **Maximum Score:** 15 (Fully conscious). * **Severity Classification:** * GCS 13–15: Mild Head Injury * GCS 9–12: Moderate Head Injury * **GCS ≤ 8: Severe Head Injury (Indicative of Coma; "GCS of 8, Intubate!")** * **Modified GCS:** For intubated patients, the verbal score is replaced with 'T' (e.g., GCS 5T), making the minimum score in such cases **2T**. * **Motor Response (M):** This is the most reliable component of the GCS for predicting long-term clinical outcomes.

Question 649: Intravenous resuscitation is indicated for a child with a burn exceeding what percentage of total body surface area?

A. 10% total body surface area (Correct Answer)
B. 20% total body surface area
C. 25% total body surface area
D. 35% total body surface area

Explanation: **Explanation:** The primary goal of burn resuscitation is to maintain tissue perfusion and prevent hypovolemic shock. Children are more susceptible to fluid loss and metabolic derangements than adults due to their larger surface-area-to-mass ratio and limited physiological reserves. **Why 10% is correct:** According to standard Advanced Burn Life Support (ABLS) and ATLS guidelines, formal intravenous (IV) fluid resuscitation is indicated in **children for burns involving >10% of the Total Body Surface Area (TBSA)**. In contrast, for **adults**, the threshold is typically **>15% TBSA**. Because children have a higher surface area relative to their weight, even a 10% burn can lead to significant systemic inflammatory response syndrome (SIRS) and rapid dehydration, necessitating IV intervention rather than oral rehydration alone. **Analysis of Incorrect Options:** * **20% TBSA:** This is a common threshold for initiating IV fluids in older adults or in specific disaster triage protocols, but it is too high for the pediatric population. * **25% & 35% TBSA:** These represent major burns. Waiting until this level of involvement to start IV fluids in a child would lead to severe hypovolemic shock and organ failure. **High-Yield Clinical Pearls for NEET-PG:** * **Parkland Formula (Modified):** 3–4 ml × weight (kg) × % TBSA. In children, **Maintenance Fluids** (using D5NS or D5LR) must be added to the resuscitation volume because children have limited glycogen stores and are prone to hypoglycemia. * **Urine Output:** The most reliable indicator of adequate resuscitation. Target **1 ml/kg/hr** in children (compared to 0.5 ml/kg/hr in adults). * **Rule of 9s:** Does not apply accurately to children; use the **Lund and Browder chart** for precise TBSA calculation in pediatrics.

Question 650: In the primary survey of a severely wounded patient, what does 'c' in the 'cABCDE' approach stand for?

A. Care about surroundings
B. Call for help
C. Catastrophic haemorrhage (Correct Answer)
D. Cardiac status

Explanation: In modern trauma management, particularly in military and pre-hospital settings, the traditional **ABCDE** approach has been updated to **cABCDE**. ### **Explanation of the Correct Answer** The lowercase **'c'** stands for **Catastrophic Haemorrhage**. This refers to massive, life-threatening external bleeding (usually from a limb or a junctional area) that can lead to exsanguination within minutes—often before an airway can even be secured. In the hierarchy of survival, "bleeding out" kills faster than a blocked airway. Therefore, the priority is to control such hemorrhage using **tourniquets** or **hemostatic dressings** before proceeding to 'A' (Airway). ### **Analysis of Incorrect Options** * **A & B (Care about surroundings / Call for help):** While scene safety and calling for backup are essential steps in the initial response, they are part of the "Preparation" or "Scene Survey" phase and are not formal components of the clinical cABCDE mnemonic. * **D (Cardiac status):** Evaluation of the heart (Circulation) is represented by the uppercase **'C'** in the sequence. This involves checking pulse, capillary refill, and managing internal bleeding/shock, which follows Airway and Breathing. ### **High-Yield Clinical Pearls for NEET-PG** * **The "March" Mnemonic:** Similar to cABCDE, the **MARCH** algorithm (Massive Hemorrhage, Airway, Respiration, Circulation, Head/Hypothermia) is also used in tactical medicine. * **Tourniquet Rule:** In catastrophic limb bleeding, a tourniquet should be applied "high and tight" over the clothing until the bleeding stops. * **Order of Mortality:** Remember the trauma triad of death: **Acidosis, Coagulopathy, and Hypothermia**. Early control of 'c' helps prevent this lethal cycle. * **ATLS 10th Edition:** While ATLS focuses on ABCDE, it acknowledges that external exsanguination must be addressed immediately upon patient contact.

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