Burn Injuries — MCQs
Burns present as all the following EXCEPT
According to the Lund and Browder chart, what percentage of total body surface area (TBSA) does the head and face represent in a 1-year-old child?
Rule of Nines estimates :
Which of the following is NOT a post-mortem finding in carbon monoxide poisoning?
Which of the following statements regarding thermal injury is correct?
Vasoconstriction in burn wound is seen in:
A body is discovered with burn marks as shown in the image, resembling a 'crocodile skin' pattern. What is the most likely cause?
A 56-year-old male is burned while sleeping in his home. His right upper and lower extremity and the anterior chest have extensive second-degree burns. What is the total percentage of body surface area affected? Reference: Rule of Nines for Adults - Each arm: 9% - Head: 9% - Anterior trunk: 18% - Posterior trunk: 18% - Each leg: 18% - Total: 99%
In the context of gunshot injuries, which of the following describes the characteristics of a close shot entry wound, including signs such as burning, blackening, tattooing around the wound, and the presence of a dirt collar?
Presence of cut injuries in the scrotum is suggestive of?
Burn Injuries Indian Medical PG Practice Questions and MCQs
Question 1: Burns present as all the following EXCEPT
- A. Acute kidney injury
- B. Shock
- C. Sepsis
- D. Air embolism (Correct Answer)
Explanation: ***Air embolism*** - **Air embolism** is a rare and severe complication, typically associated with central venous catheter insertion, lung trauma, or surgical procedures, not direct burn injuries [2]. - While burns can cause respiratory complications (e.g., **inhalation injury**), they do not directly cause **air embolism** [1]. *Acute kidney injury* - **Acute kidney injury (AKI)** can occur in severe burn patients due to several factors, including hypovolemic shock, rhabdomyolysis from muscle damage, and the formation of heme pigments [2]. - Decreased renal perfusion and the release of myoglobin/hemoglobin can lead to **acute tubular necrosis (ATN)**. *Shock* - **Hypovolemic shock** is a prominent and immediate concern in severe burn patients due to massive fluid loss from damaged capillaries and increased capillary permeability [3]. - This fluid shift, known as **burn shock**, results from third-spacing of fluids, leading to reduced intravascular volume. *Sepsis* - **Sepsis** is a major cause of morbidity and mortality in burn patients, especially after the initial resuscitative phase [1]. - The damaged **skin barrier**, along with immunosuppression caused by burns, makes patients highly susceptible to bacterial and fungal infections [1].
Question 2: According to the Lund and Browder chart, what percentage of total body surface area (TBSA) does the head and face represent in a 1-year-old child?
- A. 16%
- B. 10%
- C. 19% (Correct Answer)
- D. 13%
Explanation: ***19%*** - The **Lund and Browder chart** accounts for age-related variations in body proportions, assigning a larger percentage of **total body surface area (TBSA)** to the head in infants and young children. - For a **1-year-old child**, the head and face are estimated to represent approximately **19% TBSA**, which decreases with age as the body proportions change. *16%* - While 16% is a value sometimes associated with the head, it is not the accurate percentage for a **1-year-old child** according to the **Lund and Browder chart**. - This percentage is typically closer to that of an **older child** or adult's head, as body proportions change over time. *10%* - **10% TBSA** is far too low for the head and face of a **1-year-old child** as per the Lund and Browder chart. - This value is usually associated with areas like the **arms** in children or the head of an **adult** in some simpler TBSA estimation methods. *13%* - **13% TBSA** is an underestimation for the head and face of a **1-year-old child** when using the **Lund and Browder chart**. - The large relative size of an infant's head means it contributes a significantly higher percentage to their **total body surface area**.
Question 3: Rule of Nines estimates :
- A. Degree of severity.
- B. The extent of mortality.
- C. The extent of the burn. (Correct Answer)
- D. Degree of infection.
Explanation: ***The extent of the burn.*** - The **Rule of Nines** is a standardized tool used to estimate the **total body surface area (TBSA)** affected by burns in adults. - This estimation helps guide **fluid resuscitation decisions** and overall burn management. *Degree of severity.* - While the extent of the burn contributes to its severity, the Rule of Nines itself doesn't directly estimate the **degree (depth)** of the burn (e.g., first, second, or third-degree). - Burn severity also considers factors like **burn depth**, location, patient age, and inhalation injury. *The extent of mortality.* - The Rule of Nines serves as an initial assessment tool for burn extent, which is a factor in predicting mortality but does not directly estimate the **extent of mortality** itself. - **Mortality in burn patients** depends on numerous factors, including age, burn depth, comorbidities, and presence of inhalation injury. *Degree of infection.* - The Rule of Nines is a tool for initial burn assessment and has **no direct relevance** to the **degree or presence of infection**. - Infection is a potential complication of burns, but its assessment requires **clinical signs**, laboratory tests, and wound cultures, not TBSA estimation.
Question 4: Which of the following is NOT a post-mortem finding in carbon monoxide poisoning?
- A. Froth at mouth and nose
- B. Blue skin discoloration (Correct Answer)
- C. Cerebral edema
- D. Cherry red discoloration of skin
Explanation: ***Blue skin discoloration*** - **Cyanosis**, or blue skin discoloration, indicates **hypoxia** due to deoxygenated hemoglobin. - In carbon monoxide poisoning, **carboxyhemoglobin** prevents oxygen release but does not cause deoxygenation of the remaining hemoglobin, thus typically avoiding cyanosis. *Froth at mouth and nose* - **Frothing** at the mouth and nose can be seen in various forms of asphyxia and pulmonary edema, which can be secondary to carbon monoxide poisoning if there is significant cardiac or respiratory compromise. - While not universally present, it is a possible finding associated with acute physiological distress preceding death. *Cerebral edema* - **Cerebral edema** is a common post-mortem finding in severe carbon monoxide poisoning due to **hypoxic brain injury**. - Carbon monoxide directly impairs cellular respiration, leading to widespread tissue hypoxia, including the brain, which can manifest as swelling. *Cherry red discoloration of skin* - **Cherry red discoloration** of the skin and lividity is a classic and highly characteristic post-mortem sign of carbon monoxide poisoning. - This color is due to the formation of **carboxyhemoglobin**, which has a bright red hue and is visible through the skin.
Question 5: Which of the following statements regarding thermal injury is correct?
- A. In child below 5 years, genitals form 1% of area
- B. Lund-Browder chart is the most accurate method for estimating TBSA in children (Correct Answer)
- C. Rule of nines is more accurate than Lund-Browder chart in children
- D. Burn index is the standard clinical method for assessing burn severity
Explanation: ***Lund-Browder chart is the most accurate method for estimating TBSA in children*** - The Lund-Browder chart is the **most accurate method** for estimating the **total body surface area (TBSA)** affected by burns, especially in children, due to its ability to adjust for age-related body proportion changes. - It assigns different body proportions based on age, making it superior to the Rule of Nines for pediatric patients. - This is the **CORRECT** statement. *Rule of nines is more accurate than Lund-Browder chart in children* - This is **FALSE**. The Rule of Nines is **less accurate in children** because their head and neck comprise a larger percentage of TBSA and their lower limbs a smaller percentage compared to adults. - The Lund-Browder chart is specifically designed to account for age-related differences and is therefore more accurate in pediatric burn assessment. *In child below 5 years, genitals form 1% of area* - While this statement is **technically true**, it is not the **most correct** answer in the context of thermal injury assessment methods. - In both adults and children, the **genitals and perineum** together typically account for **1% of TBSA**. - This is a specific anatomical fact but doesn't address burn assessment methodology, which is the main focus of the question. *Burn index is the standard clinical method for assessing burn severity* - This is **FALSE**. The **Burn Index** is not a commonly used term in standard clinical burn assessment. - Burn severity is assessed by considering both **depth** (superficial, partial-thickness, full-thickness) and **TBSA percentage**, along with other factors like location and patient age, but "Burn Index" is not the standard terminology or method used.
Question 6: Vasoconstriction in burn wound is seen in:
- A. Zone of stasis (Correct Answer)
- B. Zone of coagulation
- C. Zone of hyperemia
- D. None of the options
Explanation: ***Zone of stasis*** - The **zone of stasis** is characterized by **vasoconstriction and reduced blood flow**, which, if not managed, can lead to further tissue death. - This area represents the intermediate zone with **compromised microcirculation** due to endothelial damage and vessel constriction. - **Vasoconstriction is the hallmark feature** of this zone, making it potentially salvageable with adequate resuscitation. *Zone of coagulation* - The **zone of coagulation** is the most central area of the burn, experiencing **irreversible tissue necrosis** due to direct thermal injury. - This zone has **complete cessation of blood flow** and destruction of tissue, rather than vasoconstriction. *Zone of hyperemia* - The **zone of hyperemia** is the outermost area of the burn, characterized by **increased blood flow** due to **vasodilation** as an inflammatory response. - This area is typically **viable** and expected to recover with minimal intervention. *None of the options* - Since **vasoconstriction** is the defining feature of the zone of stasis, this option is incorrect. - The zones of a burn wound are clearly defined by Jackson's model with varying degrees of **vascular compromise**.
Question 7: A body is discovered with burn marks as shown in the image, resembling a 'crocodile skin' pattern. What is the most likely cause?
- A. Chemical burns
- B. High voltage electrical burns (Correct Answer)
- C. Scald burns
- D. Radiation burns
Explanation: ***High voltage electrical burns*** - **High voltage electrical burns** can cause severe damage, including charring and deep tissue necrosis, which can result in a contracted, leathery skin appearance often described as **"crocodile skin"** or **alligator hide**. - The alternating current (AC) associated with high voltage can lead to muscle tetany, causing the victim to clench onto the source, prolonging exposure and increasing the severity of damage and the characteristic burn pattern. *Chemical burns* - Chemical burns result from exposure to corrosive substances and typically manifest as **discoloration**, **blistering**, or **deep tissue damage** depending on the agent and duration of contact. - While severe, chemical burns usually do not produce the specific "crocodile skin" pattern of extensive charring and contraction seen with high voltage electricity. *Scald burns* - Scald burns are caused by hot liquids or steam and commonly result in **blistering**, **redness**, and superficial to partial-thickness skin damage without the deep tissue charring. - The pattern of injury would typically be distinct from the described "crocodile skin," often showing flowing or splash patterns. *Radiation burns* - Radiation burns occur due to exposure to high doses of radiation and can lead to **erythema**, **blistering**, and **skin breakdown** over time. - These burns develop progressively and often have a characteristic delayed presentation and pattern related to the radiation field, not the immediate charring seen with electrical injuries.
Question 8: A 56-year-old male is burned while sleeping in his home. His right upper and lower extremity and the anterior chest have extensive second-degree burns. What is the total percentage of body surface area affected? Reference: Rule of Nines for Adults - Each arm: 9% - Head: 9% - Anterior trunk: 18% - Posterior trunk: 18% - Each leg: 18% - Total: 99%
- A. 10%
- B. 20%
- C. 40% (Correct Answer)
- D. 30%
Explanation: ***40%*** - The **Rule of Nines** is used to estimate the percentage of total body surface area (TBSA) affected by burns in adults. - **Right upper extremity** (entire arm): 9% - **Right lower extremity** (entire leg): 18% - **Anterior chest**: The burn involves a significant portion of the anterior trunk, accounting for approximately 13% (more than half of the 18% anterior trunk) - **Total**: 9% + 18% + 13% = **40%** - This patient has a major burn requiring fluid resuscitation and likely transfer to a burn center. *10%* - This percentage is far too low for the described burn distribution, which includes an entire arm and an entire leg alone (27% combined). - A 10% burn would typically involve only one arm or the head. *20%* - This percentage significantly underestimates the extent of injury. - This would represent approximately one arm (9%) plus one leg (18%), but fails to account for the anterior chest burns. *30%* - While closer, 30% still underestimates the total body surface area affected. - This would account for the arm (9%) and leg (18%) but significantly underestimates the extent of anterior chest involvement described in the scenario.
Question 9: In the context of gunshot injuries, which of the following describes the characteristics of a close shot entry wound, including signs such as burning, blackening, tattooing around the wound, and the presence of a dirt collar?
- A. Close shot exit wound
- B. Distant shot entry wound
- C. Distant shot exit wound
- D. Close shot entry wound (Correct Answer)
Explanation: ***Close shot entry wound*** - **Burning, blackening, tattooing**, and a **dirt collar** around the wound are classic signs of a **close-range gunshot entry wound**. These findings result from the burning of skin by hot gases, deposition of soot (blackening), and impact of unburnt gunpowder particles (tattooing/stippling) from a firearm discharged at a close distance. - The **"dirt collar"** (also known as a **grease collar** or **abrasion collar**) is caused by the passage of the bullet through the skin, wiping off lubricants, dirt, and residue from the bullet onto the skin around the wound. *Close shot exit wound* - An **exit wound** is typically larger, more irregular, and lacks the characteristics of burning, blackening, or tattooing because the bullet has lost momentum and often tumbles or deforms as it exits the body. - There would also be no dirt collar or soot deposits, as these are associated with the initial entry of the bullet and propellant gases. *Distant shot entry wound* - A **distant shot entry wound** would likely show an abrasion collar and a circular or oval defect, but it would lack the burning, blackening (soot), and tattooing (stippling) as the firearm was discharged from a distance preventing these elements from reaching the skin. - The lack of unburnt powder and gases impacting the skin differentiates it from a close-range shot. *Distant shot exit wound* - A **distant shot exit wound** would exhibit the same characteristics as any exit wound: larger, irregular, and without the signs of burning, blackening, or tattooing. - The absence of close-range effects like soot and stippling on a distant entry wound similarly means they would not be present on a distant exit wound.
Question 10: Presence of cut injuries in the scrotum is suggestive of?
- A. Accidental wounds
- B. Homicidal wounds (Correct Answer)
- C. Suicidal wounds
- D. None of the options
Explanation: ***Homicidal wounds*** - Injuries to the **scrotum** are highly unusual in accidental or suicidal contexts due to the protective nature and sensitivity of the area. - The presence of **cut injuries** in such a vulnerable and normally protected area often indicates an intentional act of aggression. *Accidental wounds* - Accidental scrotal injuries are typically due to **blunt trauma** or avulsion, rather than sharp, incised cuts. - They usually occur in situations like sports or industrial accidents, which are not described by "cut injuries." *Suicidal wounds* - Suicidal wounds are typically inflicted in areas like the **wrists**, neck, or chest, aiming for vital structures. - The scrotum is not a common site for self-inflicted injuries, as cutting this area is unlikely to be immediately lethal and is extremely painful. *None of the options* - This option is incorrect because the specific location and type of injury (cut injuries to the scrotum) points strongly towards a specific category of wound. - The other options are considered less likely given the highly sensitive and non-lethal nature of the scrotum for self-harm.
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