Injuries and Their Significance — MCQs

Injuries and Their Significance Indian Medical PG Practice Questions and MCQs

Question 651: What is the characteristic finding on forensic examination of an entry wound caused by a fragmenting bullet that breaks apart upon impact?

A. Distant wound with abrasion collar
B. Intermediate range wound with powder tattooing
C. Multiple small metallic fragments in wound track (Correct Answer)
D. Contact wound with stellate laceration

Explanation: ***Multiple small metallic fragments in wound track*** - A **fragmenting bullet** (such as hollow-point or soft-point ammunition) is designed to expand and break into multiple fragments upon impact with tissue. - The characteristic finding of its entry wound would therefore be the presence of **multiple small metallic fragments** within the wound track, as the bullet breaks apart. - This fragmentation increases tissue damage and energy transfer while reducing over-penetration. *Distant wound with abrasion collar* - A **distant wound** is caused by a bullet fired from a distance, typically leaving an abrasion collar around the entry site due to the bullet's rotation and friction with the skin. - This type of wound is not specific to fragmenting bullets and does not account for their fragmentation pattern. *Intermediate range wound with powder tattooing* - An **intermediate-range wound** is characterized by **powder tattooing** (stippling) around the entry site, caused by unburnt gunpowder particles impacting the skin. - While this indicates the range of fire, it does not describe the specific nature of a fragmenting bullet's interaction with tissue. *Contact wound with stellate laceration* - A **contact wound** occurs when the muzzle of the firearm is pressed directly against the skin, often resulting in a **stellate (star-shaped) laceration** due to the expansion of gases beneath the skin. - This is a feature of the range of fire, not the specific bullet type or its fragmentation characteristics.

Question 652: A 28-year-old man was involved in a bomb blast explosion. Which of the following is not a component of Marshall's triad?

A. Apnoea
B. Punctate lacerations (Correct Answer)
C. Hypotension
D. Bradycardia

Explanation: ***Punctate lacerations*** - **Punctate lacerations** are not a component of **Marshall's triad** in blast injuries. - Marshall's triad refers to the **classical triad of physiological responses** to primary blast injury, not to soft tissue injury patterns. - While punctate lacerations can occur in blast injuries, they are not part of this specific triad. *Apnoea* - **Apnoea (respiratory arrest)** is a key component of **Marshall's triad**. - It results from the **direct effect of the blast wave** on the respiratory center and pulmonary tissue. - The sudden pressure change causes **vagal stimulation** and direct lung injury. *Bradycardia* - **Bradycardia (slow heart rate)** is the second component of **Marshall's triad**. - It occurs due to **vagal stimulation** from the blast wave's impact on the thorax and cardiovascular system. - This represents a **neurogenic response** to the primary blast injury. *Hypotension* - **Hypotension (low blood pressure)** is the third component of **Marshall's triad**. - It results from **cardiovascular shock**, vasodilation, and the combined effects of apnoea and bradycardia. - This represents the **hemodynamic response** to severe blast trauma.

Question 653: Tattooing in the entry wound of a firearm injury is due to:

A. Burns
B. Smoke
C. Gunpowder (Correct Answer)
D. Wads

Explanation: ***Gunpowder*** - **Tattooing** refers to the pinpoint abrasions caused by unburnt or partially burnt **gunpowder particles** that impact the skin around a gunshot wound. - This pattern indicates a **close-range firing** and is crucial for forensic analysis in determining the distance of the shot. *Burns* - While a close-range gunshot can cause **thermal injury** from hot gases, this typically manifests as **searing or blackening** of the skin, not the distinct pattern of tattooing. - Burns are caused by heat, whereas tattooing is caused by the **physical impact of solid particles**. *Smoke* - **Smoke (soot)** from a gunshot can smudge or deposit on the skin, causing **blackening or fouling** around the wound. - However, this is easily wiped away and does not create the **permanent pinpoint abrasions** characteristic of tattooing. *Wads* - **Wads** are components found in shotgun cartridges that separate the powder from the shot, or hold the shot together. - While they can cause a **contusion or laceration** if they exit the barrel and strike the body at very close range, they do not produce the fine, dispersed pattern of tattooing.

Practice by Chapter

Mechanical Injuries

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Transportation Injuries

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Fall from Height

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Blunt Force Trauma

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Sharp Force Trauma

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Ballistic Injuries

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Burn Injuries

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Drowning

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Electrocution

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Lightning Injuries

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Explosion Injuries

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Pattern Injuries and Their Recognition

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