Trauma Practice Questions

Q: What is the normal cerebral blood flow per 100 grams of brain tissue?

55 ml/min. **Explanation:** The correct answer is **55 ml/min** (Option B). Cerebral Blood Flow (CBF) is a critical parameter in neurotrauma management, representing the volume of blood delivered to the brain per unit of time. In a healthy adult, the average CBF is approximately **50 to 55 ml per 100 grams of brain tissue per minute**. This flow is tightly regulated by **autoregulation**, ensuring constant perfusion despite fluctuations in Mean Arterial Pressure (MAP) between 50 and 150 mmHg. **Analysis of Options:** * **Option A (45 ml/min):** While close, this is slightly below the standard physiological average. However, it is important to note that gray matter receives higher flow (~70-80 ml) than white matter (~20 ml). * **Option B (55 ml/min):** This is the standard textbook value for global CBF used in surgical and physiological examinations. * **Options C & D (65-75 ml/min):** These values represent hyperperfusion or luxury perfusion, which is not the baseline physiological state for the entire brain. **Clinical Pearls for NEET-PG:** * **Critical Thresholds:** * **Ischemic Penumbra:** CBF < 20 ml/100g/min (functional impairment occurs). * **Irreversible Infarction:** CBF < 10 ml/100g/min (cell death/ionic pump failure). * **Cerebral Perfusion Pressure (CPP):** Calculated as **MAP – ICP**. In trauma management (ATLS/BTF guidelines), the goal is to maintain CPP between **60–70 mmHg**. * **Chemical Regulation:** CBF is most sensitive to **PaCO₂**. Hyperventilation causes hypocapnia, leading to cerebral vasoconstriction and a subsequent decrease in ICP—a high-yield maneuver for acute herniation.

Q: A 40-year-old male patient sustained a head injury after being hit by a car and was brought to the casualty. On examination, the patient is drowsy, aphasic, opens eyes on deep pain stimulus, and withdraws from pain stimulus. What is his Glasgow Coma Scale (GCS) score?

7. ### Explanation The Glasgow Coma Scale (GCS) is a clinical tool used to assess the level of consciousness based on three parameters: Eye opening (E), Verbal response (V), and Motor response (M). The total score ranges from 3 to 15. **Breakdown of this patient’s GCS:** * **Eye Opening (E):** The patient opens eyes only on "deep pain stimulus." This corresponds to **E2**. (E1: None, E2: To pain, E3: To sound, E4: Spontaneous). * **Verbal Response (V):** The patient is "aphasic" (unable to produce speech). In the context of trauma assessment, no verbal output corresponds to **V1**. (V1: None, V2: Incomprehensible sounds, V3: Inappropriate words, V4: Confused, V5: Oriented). * **Motor Response (M):** The patient "withdraws from pain stimulus." This corresponds to **M4**. (M1: None, M2: Extension/Decerebrate, M3: Abnormal flexion/Decorticate, M4: Withdrawal, M5: Localizes pain, M6: Obeys commands). **Total GCS = E2 + V1 + M4 = 7.** #### Analysis of Incorrect Options: * **Option A (8):** Incorrect calculation; likely misinterpreting "aphasic" as "incomprehensible sounds" (V2) or eye-opening to speech (E3). * **Option C (6):** Incorrect calculation; likely under-scoring the motor response (M3 instead of M4). * **Option D (10):** Incorrect calculation; suggests a much higher level of consciousness (e.g., E3, V3, M4). #### Clinical Pearls for NEET-PG: * **Severity Classification:** GCS 13–15 (Mild), 9–12 (Moderate), **≤8 (Severe head injury)**. * **Management Rule:** "GCS of 8, Intubate!" (Patients with a score of 8 or less usually require definitive airway protection). * **Most Important Component:** The **Motor score** is the most reliable predictor of clinical outcome. * **Note on Aphasia:** If a patient is intubated, the verbal score is recorded as **1T**.

Q: A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

Fat embolism. ### Explanation The correct answer is **Fat Embolism (Option A)**. **Why it is correct:** Fat Embolism Syndrome (FES) typically occurs 24–72 hours after a long bone or pelvic fracture. The pathophysiology involves the release of bone marrow fat into the systemic circulation (Mechanical Theory) and the subsequent inflammatory response to free fatty acids (Biochemical Theory). The patient presents with the classic **Gurd’s Triad**: 1. **Respiratory distress:** Tachypnea, dyspnea, and diffuse lung infiltrates (Snowstorm appearance). 2. **Neurological symptoms:** (Though not mentioned here, often includes confusion/seizures). 3. **Dermatological signs:** A pathognomonic **petechial rash** (usually over the chest, axilla, and conjunctiva) due to capillary rupture. The right-sided heart dilatation on X-ray/ECG indicates acute cor pulmonale due to sudden pulmonary vascular obstruction. **Why incorrect options are wrong:** * **Pneumonia (Option B):** While it causes infiltrates and tachypnea, it usually presents with fever and productive cough, and it would not explain the petechial rash or sudden cardiovascular collapse. * **Pneumothorax (Option C):** This would present with absent breath sounds and hyper-resonance on the affected side, not diffuse infiltrates or a petechial rash. * **Pericarditis (Option D):** This presents with pleuritic chest pain and friction rub, but not with pulmonary infiltrates or a petechial rash. **NEET-PG High-Yield Pearls:** * **Most common cause:** Long bone fractures (Femur > Tibia > Pelvis). * **Pathognomonic sign:** Petechial rash (present in only 20-50% of cases but highly specific). * **Diagnosis:** Primarily clinical (Gurd’s Criteria). * **Treatment:** Mainly supportive (Oxygenation/Ventilation). Early fixation of fractures is the best preventive measure. * **Schonfeld’s Criteria:** A scoring system used for FES; a score >5 is diagnostic.

Q: Which of the following is/are a method for measuring blood loss?

All of the above. **Explanation:** Accurate estimation of blood loss is critical in trauma and surgical settings to guide fluid resuscitation and prevent hemorrhagic shock. The correct answer is **D (All of the above)** because each option represents a validated clinical method for quantifying blood loss. 1. **Weighing Swabs (Option A):** This is a standard intraoperative technique. By subtracting the known dry weight of a surgical swab from its weight when soaked with blood (1 gram ≈ 1 mL), clinicians can estimate blood loss. However, this may underestimate loss due to evaporation or overestimate it if irrigation fluid is present. 2. **Measurement of Swelling in Closed Fractures (Option B):** In trauma, significant occult bleeding occurs into soft tissues. For example, a closed femoral shaft fracture can result in 1–1.5 liters of blood loss, visible as an increase in thigh circumference. Clinical formulas use the limb's volume increase to estimate this "hidden" loss. 3. **Measurement of Blood Clot (Option C):** The size of a blood clot can provide a rough bedside estimate. A clot the size of a closed fist is approximately equal to **500 mL** of blood. **Why other options are not "wrong":** In a "Multiple Correct" or "All of the above" format, if more than one method is clinically recognized, the collective option is the most accurate choice. **High-Yield Clinical Pearls for NEET-PG:** * **The "Fist" Rule:** 1 fist-sized clot ≈ 500 mL blood. * **Fracture Blood Loss Estimates:** * Rib: 125 mL * Radius/Ulna: 250–500 mL * Humerus: 500–750 mL * Tibia/Fibula: 500–1000 mL * **Femur: 1000–1500 mL** * **Pelvis: 1500–3000+ mL (Life-threatening)** * **Class of Shock:** Remember that clinical signs (tachycardia, hypotension) usually manifest only after >15-30% of blood volume is lost (Class II/III Shock).

Q: What investigation should be performed immediately in an unstable patient presenting with blunt abdominal trauma?

Ultrasound (USG). In the management of blunt abdominal trauma (BAT), the choice of investigation is primarily dictated by the patient's **hemodynamic stability**. ### Why Ultrasound (USG) is Correct For an **unstable patient**, the immediate goal is to identify life-threatening intra-abdominal hemorrhage rapidly without moving the patient from the resuscitation area. **FAST (Focused Assessment with Sonography for Trauma)** is the investigation of choice. It is a bedside, non-invasive, and rapid tool used to detect free intraperitoneal fluid (blood) in four areas: Morrison’s pouch (RUQ), splenorenal recess (LUQ), pelvis (Pouch of Douglas), and the pericardium. A positive FAST in an unstable patient is an indication for immediate laparotomy. ### Why Other Options are Incorrect * **B. CT Scan:** This is the "Gold Standard" for diagnosing solid organ injuries. However, it requires the patient to be **hemodynamically stable** because it is time-consuming and requires moving the patient to the radiology suite ("Death in the Donut"). * **C. Complete Hemogram:** While important for baseline data, hemoglobin levels may not drop immediately after acute hemorrhage due to compensatory mechanisms; it is not a diagnostic tool for acute trauma. * **D. Abdominal X-ray:** It has very limited utility in blunt trauma. While it may show pneumoperitoneum in hollow viscus injury, it cannot detect hemorrhage or solid organ injury effectively. ### High-Yield Clinical Pearls for NEET-PG * **Hemodynamically Unstable + Positive FAST** = Proceed to Emergency Laparotomy. * **Hemodynamically Stable + Positive FAST** = Proceed to Contrast-Enhanced CT (CECT) to grade the injury. * **DPL (Diagnostic Peritoneal Lavage)** is an alternative to FAST in unstable patients if USG is unavailable, but it is invasive and cannot detect retroperitoneal bleeds. * **Most common organ injured in BAT:** Spleen. * **Most common organ injured in penetrating trauma:** Small Intestine.

Q: A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

Diffuse axonal injuries. **Explanation:** **Diffuse Axonal Injury (DAI)** is the most likely diagnosis. It occurs due to high-velocity rotational acceleration-deceleration forces (e.g., RTA), causing shearing of axons at the interface of tissues with different densities. 1. **Why it is correct:** The clinical hallmark of DAI is a patient who is **unconscious** (low GCS) immediately following trauma, but whose **CT scan appears disproportionately normal** or shows no midline shift. Characteristic CT/MRI findings include **multiple punctate (tiny) hemorrhages** at the grey-white matter junction, corpus callosum, or brainstem. While CT is often the first investigation, **MRI (specifically Susceptibility Weighted Imaging - SWI)** is the gold standard for diagnosis. 2. **Why other options are incorrect:** * **Cerebral Contusion:** These are "bruises" of the brain, usually seen as "salt and pepper" appearance (heterogeneous areas of hemorrhage and edema) on CT, typically located at the poles (frontal/temporal) due to coup-contrecoup injuries. * **Cerebral Laceration:** Involves a physical tear in the brain tissue, usually associated with depressed skull fractures or penetrating trauma; it would show significant focal damage on CT. * **Multiple Infarcts:** These follow a vascular distribution and are typically seen in embolic events or elderly patients, not acutely following trauma in a young male. **High-Yield Pearls for NEET-PG:** * **Most common site for DAI:** Grey-white matter junction (Grade I), followed by Corpus Callosum (Grade II) and Brainstem (Grade III). * **Imaging of choice:** MRI (SWI or Gradient Echo sequences) is more sensitive than CT. * **Prognosis:** Often poor; it is a leading cause of persistent vegetative state after trauma.

Q: Multi-organ failure is defined as failure of a minimum of how many organs?

2. **Explanation:** **Multi-Organ Dysfunction Syndrome (MODS)**, formerly known as Multiple Organ Failure (MOF), is a clinical condition characterized by the progressive dysfunction of two or more organ systems in an acutely ill patient, such that homeostasis cannot be maintained without therapeutic intervention. 1. **Why Option A is Correct:** By definition, the involvement of a **minimum of 2 organ systems** (e.g., respiratory failure requiring ventilation and renal failure requiring dialysis) qualifies as multi-organ failure. The condition represents a continuum of physiological insult rather than a single event, often triggered by sepsis, major trauma, or severe burns. 2. **Why Options B, C, and D are Incorrect:** While MODS can certainly involve 3, 4, or 5 organs, these numbers represent the *severity* or *progression* of the syndrome rather than the diagnostic threshold. As the number of failing organs increases, the mortality rate rises exponentially (e.g., failure of 3+ organs for more than 4 days is associated with a mortality rate approaching 90-100%). **High-Yield Clinical Pearls for NEET-PG:** * **Primary MODS:** Occurs as a direct result of a specific insult (e.g., pulmonary contusion causing respiratory failure). * **Secondary MODS:** Occurs as a result of the host’s systemic inflammatory response (SIRS) to an insult, affecting organs distant from the original injury. * **Scoring Systems:** The **SOFA (Sequential Organ Failure Assessment)** score and the **APACHE II** score are the most commonly used tools in the ICU to quantify the degree of organ dysfunction and predict mortality. * **Common Sequence:** In post-traumatic MODS, the lungs are typically the first organ to fail (ARDS), followed by the liver, kidneys, and gastrointestinal tract.

Question 1

What is the first fluid of choice in hypovolemic shock?

Accepted Answer

Normal saline

Answer

Dextran

Answer

Dextrose normal saline

Answer

Hartmann solution

Question 2

What is the normal cerebral blood flow per 100 grams of brain tissue?

Accepted Answer

55 ml/min

Answer

45 ml/min

Answer

65 ml/min

Answer

75 ml/min

Question 3

A 40-year-old male patient sustained a head injury after being hit by a car and was brought to the casualty. On examination, the patient is drowsy, aphasic, opens eyes on deep pain stimulus, and withdraws from pain stimulus. What is his Glasgow Coma Scale (GCS) score?

Accepted Answer

7

Answer

8

Answer

6

Answer

10

Question 4

A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

Accepted Answer

Fat embolism

Answer

Pneumonia

Answer

Pneumothorax

Answer

Pericarditis

Question 5

Which of the following is/are a method for measuring blood loss?

Accepted Answer

All of the above

Answer

Weighing swabs

Answer

Measurement of swelling in closed fractures

Answer

Measurement of blood clot

Question 6

What investigation should be performed immediately in an unstable patient presenting with blunt abdominal trauma?

Accepted Answer

Ultrasound (USG)

Answer

CT Scan

Answer

Complete Hemogram

Answer

Abdominal X-ray

Question 7

In the pediatric age group, what is the most common feature of polytrauma?

Accepted Answer

Hypothermia

Answer

Hypotension

Answer

Hypovolemic shock

Answer

Hypoxemia

Question 8

Following traumatic peripheral nerve transection, at what rate does regrowth usually occur?

Accepted Answer

1 mm per day

Answer

0.1 mm per day

Answer

5 mm per day

Answer

1 cm per day

Question 9

A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

Accepted Answer

Diffuse axonal injuries

Answer

Cerebral contusion

Answer

Cerebral laceration

Answer

Multiple infarcts

Question 10

Multi-organ failure is defined as failure of a minimum of how many organs?

Accepted Answer

2

Answer

3

Answer

4

Answer

5

Trauma — MCQs

Trauma — MCQs

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