Asphyxial Deaths — MCQs

Asphyxial Deaths Indian Medical PG Practice Questions and MCQs

Question 81: What is a method of homicidal smothering and traumatic asphyxia?

A. Choking
B. Gagging
C. Burking (Correct Answer)
D. Overlying

Explanation: **Explanation:** **Burking** is the correct answer as it specifically combines two mechanisms of asphyxia: **homicidal smothering** and **traumatic asphyxia**. The term originates from the 19th-century serial killers Burke and Hare. In this method, the assailant sits or kneels on the victim's chest (causing traumatic asphyxia by preventing chest expansion) while simultaneously closing the nose and mouth with the hands (causing smothering). **Analysis of Options:** * **Choking (A):** This is a form of asphyxia caused by the internal obstruction of the air passages by a foreign body (e.g., food, coins, or blood clots). It is usually accidental. * **Gagging (B):** This involves pushing a cloth or object into the mouth to prevent vocalization. While it can lead to smothering if the tongue is pushed back or the nostrils are occluded, it does not involve traumatic (compression) asphyxia. * **Overlying (D):** This is a form of accidental traumatic asphyxia where a heavy person (often an intoxicated parent) rolls over a small child in bed, compressing the chest. It lacks the homicidal smothering component of Burking. **High-Yield Clinical Pearls for NEET-PG:** * **Burke’s Punch:** A classic sign where there is no external injury, but internal examination reveals bruising of the intercostal muscles and ribs due to the weight of the assailant. * **Post-mortem findings:** In Burking, classic signs of asphyxia (cyanosis, congestion, and **Tardieu spots**) are usually very prominent due to the dual mechanism of hypoxia. * **Legal Significance:** Burking is a classic example of "homicide with minimal external signs of violence," making it a favorite topic for forensic examiners.

Question 82: What is the site of the knot in classical hanging?

A. Nape of the neck (Correct Answer)
B. Right side of the neck
C. Left side of the neck
D. Below the chin

Explanation: **Explanation:** In forensic medicine, hanging is classified based on the position of the knot. **Classical hanging** refers specifically to a situation where the knot is placed in the midline, over the **nape of the neck (occiput)**. This position is significant because it typically results in a symmetrical ligature mark that rises towards the knot, often leading to rapid death due to complete occlusion of the cervical air passages and blood vessels. **Analysis of Options:** * **A. Nape of the neck (Correct):** This is the definition of classical hanging. The symmetry of the force applied to the neck is maximal here. * **B & C. Right/Left side of the neck (Incorrect):** When the knot is placed on either side of the neck (usually at the mastoid process), it is termed **Typical Hanging**. This is the most common variety encountered in suicidal cases. * **D. Below the chin (Incorrect):** If the knot is placed under the chin, it is a form of **Atypical Hanging**. This position is specifically associated with judicial hanging (long drop), where it facilitates the subluxation of the cervical vertebrae (Hangman’s fracture). **High-Yield Clinical Pearls for NEET-PG:** * **Typical vs. Atypical:** Any position of the knot other than the nape of the neck is technically "atypical," though many textbooks use "typical" specifically for the mastoid position. * **Ligature Mark:** In hanging, the mark is usually non-continuous, oblique, and placed high above the thyroid cartilage (unlike strangulation, which is horizontal and continuous). * **Cause of Death:** The most common cause of death in hanging is **asphyxia combined with cerebral ischemia**. * **Post-mortem finding:** **Saliva trickling** from the corner of the mouth opposite the knot is considered a sure sign of antemortem hanging.

Question 83: Which of the following is the first internal sign of putrefaction that you are likely to observe during an autopsy?

A. Greenish discoloration of the right iliac fossa
B. Marbling
C. Discoloration of the under surface of the liver (Correct Answer)
D. Liquefaction of the brain

Explanation: **Explanation:** The correct answer is **C. Discoloration of the under surface of the liver.** In forensic pathology, putrefaction is the decomposition of organic matter by bacterial action. While the first **external** sign of putrefaction is the greenish discoloration of the right iliac fossa, the first **internal** sign is the reddish-green or brownish discoloration on the under surface of the liver. This occurs because the liver is in direct contact with the transverse colon, allowing hydrogen sulfide ($H_2S$) gas produced by intestinal bacteria to diffuse through the intestinal wall and react with the iron in the liver's hemoglobin, forming sulfhaemoglobin. **Analysis of Incorrect Options:** * **A. Greenish discoloration of the right iliac fossa:** This is the first **external** sign of putrefaction, caused by the proximity of the caecum (rich in bacteria and moisture) to the abdominal wall. * **B. Marbling:** This is a later phenomenon (usually 24–48 hours) where the superficial veins become visible as linear greenish-black streaks due to the reaction of $H_2S$ with hemoglobin within the vessels. * **C. Liquefaction of the brain:** This occurs in the later stages of decomposition. While the brain softens early, complete liquefaction is not the initial sign. **High-Yield Clinical Pearls for NEET-PG:** * **First Internal Sign:** Under surface of the liver. * **First External Sign:** Right iliac fossa (RIF) discoloration. * **Earliest Organ to Putrefy:** Larynx and trachea (followed by the stomach and intestines). * **Last Organ to Putrefy (Male):** Prostate. * **Last Organ to Putrefy (Female):** Non-gravid uterus (due to thick muscular walls). * **Casper’s Dictum:** Rate of putrefaction ratio is 1:2:8 (Air : Water : Earth).

Question 84: Traumatic asphyxia is a type of:

A. Hanging
B. Ligature Strangulation
C. Suffocation (Correct Answer)
D. Manual strangulation

Explanation: **Explanation:** **Traumatic Asphyxia** (also known as Perthes syndrome) is a form of **mechanical asphyxia** caused by intense external compression of the chest and abdomen by a heavy weight. This pressure prevents chest expansion and normal respiratory movements, leading to a failure of ventilation. In forensic classification, any form of asphyxia resulting from the mechanical prevention of respiratory movements is categorized under **Suffocation**. **Why the other options are incorrect:** * **Hanging (A) and Ligature Strangulation (B):** These are forms of **constriction of the neck** by a ligature. In hanging, the force is the body's weight; in ligature strangulation, it is an external force other than the body's weight. * **Manual Strangulation (D):** Also known as throttling, this involves compression of the neck by human hands or fingers. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** The sudden compression causes a rise in intrathoracic pressure, forcing blood backward from the right atrium into the veins of the head and neck (which lack valves). * **Classic Triad:** 1. **Facial Congestion and Cyanosis:** Deep "mask-like" purple-blue discoloration of the face and neck. 2. **Subconjunctival Hemorrhages:** Often extensive and dramatic. 3. **Petechiae:** Found on the face, neck, and upper chest (above the level of compression). * **Common Scenarios:** Stampedes (crowd crush), cave-ins, or being pinned under a vehicle. * **Key Distinction:** Unlike other asphyxias, the airway is usually patent; the pathology is purely restrictive/mechanical.

Question 85: In cases of complete hanging, hypostasis is typically observed over which part(s) of the body after suspension for more than 8 hours?

A. The back of the body only
B. Around the ligature mark
C. The arms and legs (Correct Answer)
D. The front of the body only

Explanation: **Explanation:** In cases of **complete hanging** (where the body is fully suspended and the feet do not touch the ground), the distribution of post-mortem lividity (hypostasis) is governed by gravity. **Why Option C is correct:** When a body remains suspended vertically for a prolonged period (usually more than 4–6 hours), blood gravitates toward the most dependent parts of the body. In a vertical position, these are the **lower limbs (legs) and the upper limbs (arms/hands)**. This specific distribution is known as **"Glove and Stocking" hypostasis**. If the body remains suspended for more than 8–12 hours, the pressure of the blood can cause small capillary ruptures, leading to punctate hemorrhages known as **Tardieu spots** in these dependent areas. **Why other options are incorrect:** * **Options A & D:** Hypostasis on the back or front occurs in bodies lying in a horizontal (supine or prone) position. In vertical hanging, gravity prevents blood from settling primarily on the trunk. * **Option B:** While there may be some congestion or bruising around the ligature mark, this is not where hypostasis (the settling of blood) typically accumulates in a suspended body. **High-Yield Clinical Pearls for NEET-PG:** * **Glove and Stocking distribution:** Pathognomonic for deaths occurring in a vertical position (hanging). * **Shifting of Hypostasis:** If a body is cut down and placed supine before lividity is fixed, the "Glove and Stocking" pattern may shift to the back. * **Post-mortem Purging:** In prolonged hanging, hypostasis in the head and neck (due to the ligature) can cause facial congestion and protrusion of the tongue. * **Tardieu Spots:** While originally described in hanging, they are now considered a sign of intense mechanical congestion and can occur in various asphyxial deaths.

Question 86: All of the following may cause Traumatic Asphyxia, except?

A. Railway accident
B. Road traffic accident
C. Accidental strangulation (Correct Answer)
D. Stampede in crowd

Explanation: ### Explanation **Concept of Traumatic Asphyxia** Traumatic asphyxia (also known as **Maschka’s sign** or **Perthes’ syndrome**) is a form of mechanical asphyxia where respiration is prevented by **external compression of the chest and abdomen** by a heavy weight. This compression prevents chest expansion and leads to a sudden rise in venous pressure, causing characteristic cervicofacial cyanosis and petechiae. **Why "Accidental Strangulation" is the Correct Answer:** Accidental strangulation (e.g., the "Isadora Duncan" syndrome where a scarf gets caught in a wheel) is a form of **ligature strangulation**. In this condition, death occurs due to constriction of the neck structures (airway and blood vessels), not due to external pressure on the chest or abdomen. Therefore, it does not fall under the category of traumatic asphyxia. **Analysis of Incorrect Options:** * **Railway & Road Traffic Accidents:** These are common causes where a heavy vehicle or debris pins the victim’s chest against a hard surface, causing mechanical fixation of the respiratory muscles. * **Stampede in a Crowd:** This is a classic NEET-PG scenario (human crush). The weight of multiple bodies pressing against a victim prevents thoracic expansion, leading to traumatic asphyxia. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Traumatic asphyxia is characterized by: * Intense cyanosis of the face and neck (above the level of compression). * Subconjunctival hemorrhages. * Multiple petechiae on the face, neck, and upper chest. 2. **Internal Findings:** Lungs are usually congested and edematous, but unlike other asphyxias, the heart often shows no significant abnormalities. 3. **Burking:** A combination of traumatic asphyxia (kneeling on the chest) and smothering (closing nose/mouth).

Question 87: All of the following are true about death by strangulation except?

A. Dribbling of saliva down the chin (Correct Answer)
B. Bleeding from the nose is a feature
C. Hyoid fracture is common
D. Fracture-dislocation of cervical vertebrae is rare

Explanation: ### Explanation In forensic medicine, distinguishing between hanging and strangulation is a high-yield topic for NEET-PG. **Why Option A is the Correct Answer (The "Except" Statement):** **Dribbling of saliva** is a **pathognomonic sign of ante-mortem hanging**. It occurs because the pressure of the ligature on the salivary glands (parotid/submandibular) forces saliva out of the mouth. Since hanging is usually a vertical suspension, gravity causes the saliva to dribble down the chin or chest. In **strangulation** (ligature or manual), the victim is typically horizontal or struggling, and the pressure is applied differently, making dribbling of saliva an absent feature. **Analysis of Incorrect Options:** * **B. Bleeding from the nose:** This is a common feature in strangulation. Due to the violent nature of the struggle and the sudden increase in venous pressure (asphyxia), capillaries in the nasal mucosa or ears may rupture, leading to epistaxis or otorrhagia. * **C. Hyoid fracture is common:** In manual strangulation (throttling), direct inward pressure on the greater cornua of the hyoid bone frequently leads to fractures (especially in victims over 40 years where the bone is ossified). In contrast, hyoid fractures are rare in hanging (occurring in only 15-20% of cases). * **D. Fracture-dislocation of cervical vertebrae is rare:** This is a true statement. Cervical fractures are characteristic of **Judicial Hanging** (long drop). In ligature or manual strangulation, the force is insufficient to cause vertebral dislocation. ### NEET-PG High-Yield Pearls: * **Ligature Mark:** In hanging, it is usually oblique, non-continuous, and above the thyroid cartilage. In ligature strangulation, it is **transverse (horizontal)**, continuous, and usually below the thyroid cartilage. * **Emphysema Aquosum:** Seen in drowning. * **Simon’s Sign:** Deep hemorrhages in the anterior longitudinal ligament of the lumbar spine; specific to hanging. * **Fracture of Hyoid:** Inward compression fracture is seen in Throttling; Outward tugging fracture is seen in Hanging.

Question 88: What spinal level fracture-dislocation is typically caused by judicial hanging?

A. C2-3 fracture dislocation (Correct Answer)
B. C4-5 fracture dislocation
C. C6-7 fracture dislocation
D. C7-8 fracture dislocation

Explanation: In judicial hanging, the mechanism of death is typically a fracture-dislocation of the upper cervical spine, specifically at the **C2-C3 level**. This is known as a **Hangman’s Fracture**. ### 1. Why C2-3 is Correct Judicial hanging involves a "long drop" where the body falls a calculated distance before being jerked to a halt by the noose. The submental position of the knot causes forceful **hyperextension and distraction** of the head. This leads to: * Bilateral fractures of the **pars interarticularis** of the axis (C2). * Disruption of the C2-C3 intervertebral disc and ligaments. * Subsequent transection or compression of the spinal cord at this high level, causing immediate respiratory paralysis and death. ### 2. Why Other Options are Incorrect * **C4-5 and C6-7:** These levels are more commonly associated with hyperflexion or hyperextension injuries from vehicular accidents or diving into shallow water. While they cause quadriplegia, they are not the classic site of injury in judicial hanging because the force is not concentrated at the base of the skull. * **C7-8:** This level is at the cervicothoracic junction. Fractures here are rare in hanging as the mechanical leverage of the noose specifically targets the highly mobile upper cervical vertebrae. ### 3. High-Yield Pearls for NEET-PG * **Hangman’s Fracture:** Specifically refers to the bilateral fracture of the pedicles/pars interarticularis of **C2**. * **Cause of Death:** In judicial hanging, it is primarily **cervical fracture-dislocation** leading to cord compression. In typical/suicidal hanging, it is usually **asphyxia or cerebral ischemia**. * **Fracture Incidence:** Fractures of the hyoid bone and thyroid cartilage are **less common** in judicial hanging compared to suicidal hanging because the sudden drop causes cord injury before laryngeal compression occurs. * **Drop Length:** The length of the drop is calculated based on the victim's weight to ensure the neck breaks without decapitation.

Question 89: Hanging causes significant injury to which of the following structures?

A. Vertebral artery
B. Carotid artery (Correct Answer)
C. Trachea
D. Esophagus

Explanation: **Explanation:** In cases of hanging, the **Carotid artery** is the most frequently injured vascular structure due to its anatomical vulnerability and the mechanism of mechanical compression. **Why Carotid Artery is Correct:** The carotid arteries are superficial and located anterior to the cervical vertebrae. During hanging, the ligature creates a localized, high-pressure zone that compresses the artery against the spine. This often leads to **intimal tearing** (Amussat’s sign), particularly near the bifurcation. Because the carotids are the primary vessels supplying oxygenated blood to the brain, their occlusion (requiring only 3.5–5 kg of force) is a leading cause of rapid loss of consciousness and death in hanging. **Why Other Options are Incorrect:** * **Vertebral Artery:** These are protected within the foramina transversaria of the cervical vertebrae. It requires significantly more force (approx. 16–30 kg) to occlude them, and direct structural injury is rare compared to the carotids. * **Trachea:** While the airway can be compressed, the cartilaginous rings provide structural resistance. Airway obstruction is often secondary to the upward and backward displacement of the tongue and hyoid bone rather than direct tracheal collapse. * **Esophagus:** This is a flexible, muscular tube located posterior to the trachea. It is rarely injured in hanging as it collapses easily without structural damage and is shielded by anterior structures. **High-Yield Clinical Pearls for NEET-PG:** * **Amussat’s Sign:** Transverse tears in the intima of the common carotid artery (seen in ~5-10% of cases). * **Martin’s Sign:** Hemorrhage into the adventitia of the carotid artery. * **Pressure Requirements:** Jugular veins (2 kg), Carotid arteries (3.5–5 kg), Vertebral arteries (16–30 kg). * **Fractures:** In judicial hanging, the most common fracture is the **Hangman’s Fracture** (bilateral pedicle fracture of C2). In suicidal hanging, fractures of the **Hyoid bone** (greater cornua) or thyroid cartilage are more common.

Question 90: Diatoms are seen in death due to which of the following causes?

A. Strangulation
B. Drowning (Correct Answer)
C. Electrocution
D. Asphyxia

Explanation: **Explanation:** **Drowning** is the correct answer because of the **Diatom Test**, a gold standard in forensic pathology for diagnosing ante-mortem drowning. Diatoms are microscopic, unicellular algae with silica-based cell walls (frustules) found in water bodies. When a conscious person drowns, they inhale water containing these diatoms. The algae enter the alveolar spaces, cross the alveolar-capillary membrane into the pulmonary circulation, and are distributed by the beating heart to distant organs like the **bone marrow (most reliable)**, brain, and liver. If a body is dumped in water *after* death (post-mortem submersion), there is no circulation to transport diatoms to these distant sites, making their presence in closed organs a definitive sign of ante-mortem drowning. **Why other options are incorrect:** * **Strangulation:** This is a form of mechanical asphyxia caused by external pressure on the neck (ligature or manual). It does not involve water inhalation; therefore, diatoms are absent. * **Electrocution:** Death occurs due to ventricular fibrillation or respiratory paralysis caused by electric current. It has no physiological mechanism for diatom entry. * **Asphyxia:** While drowning is a *type* of asphyxia, the term "asphyxia" is a broad category. Diatoms are specific only to drowning and are not found in other forms like hanging or smothering. **High-Yield Clinical Pearls for NEET-PG:** * **Best Site for Diatom Test:** Bone marrow (Femur/Sternum) is preferred because it is protected from contamination during decomposition. * **Acid Digestion Method:** Used to extract diatoms by destroying organic tissue with strong acids (Nitric acid). * **False Positives:** Can occur if the person consumed tap water or shellfish shortly before death (though rare in bone marrow). * **Dry Drowning:** Diatoms will be **absent** because laryngeal spasm prevents water from entering the lungs.

Practice by Chapter

Pathophysiology of Asphyxia

Practice Questions

Hanging

Practice Questions

Strangulation

Practice Questions

Suffocation

Practice Questions

Traumatic Asphyxia

Practice Questions

Drowning

Practice Questions

Choking

Practice Questions

Chemical Asphyxiants

Practice Questions

Positional Asphyxia

Practice Questions

Autoerotic Asphyxia

Practice Questions

Pediatric Asphyxia

Practice Questions

Postmortem Findings in Asphyxia

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free