Drowning — MCQs
A dead body shows diatoms in bone marrow on forensic examination. Time since death is 6 hours. What does it indicate?
In dry drowning:
Which of the following is a feature of manual strangulation?
Cause of death for drowning in cold water:
Immersion syndrome is also known as?
The dead body of a child was recovered from a river with froth around his mouth, which reappeared even after wiping it off. Which postmortem finding is not seen in this case?
In a case of drowning, which of the following is considered a definitive sign of antemortem drowning?
Gettler's test is used to diagnose death due to:
Which of the following is not a feature of manual strangulation?
The dead body of a 20 year old man found in the sea was brought in for postmortem examination. Which of the following findings would you see in seawater drowning? 1. Hemoconcentration 2. Pulmonary edema 3. Hyponatremia 4. Hypernatremia 5. Hemolysis
Drowning Indian Medical PG Practice Questions and MCQs
Question 1: A dead body shows diatoms in bone marrow on forensic examination. Time since death is 6 hours. What does it indicate?
- A. Ante-mortem drowning (Correct Answer)
- B. Non-specific finding
- C. Cannot differentiate
- D. Post-mortem drowning
Explanation: ***Ante-mortem drowning*** - The presence of **diatoms** in the **bone marrow** indicates that the deceased was alive and circulating blood when immersed in diatom-containing water. - During **ante-mortem drowning**, diatoms from the inhaled water cross the alveolar-capillary membrane and are disseminated throughout the body via the bloodstream, accumulating in organs like bone marrow. *Non-specific finding* - The presence of diatoms in the bone marrow is a **highly specific indicator** of ante-mortem drowning. - It is not a non-specific finding, as diatoms are not normally found in the bone marrow of individuals who died from other causes. *Cannot differentiate* - Forensic analysis of diatom presence and distribution is a recognized method to **differentiate** between ante-mortem and post-mortem immersion. - The demonstration of diatoms in internal organs, particularly bone marrow, is a strong indicator of vitality at the time of immersion. *Post-mortem drowning* - In **post-mortem drowning**, the circulatory system has ceased, preventing diatoms from the inhaled water from being transported to internal organs like the bone marrow. - While diatoms might be found in the lungs and airways in post-mortem immersion, their presence in distant organs like bone marrow is **absent** or **minimal**.
Question 2: In dry drowning:
- A. Water does not enter lungs because of laryngeal spasm (Correct Answer)
- B. Seen in alcoholics due to drowning in shallow pool
- C. Death occurs due to sudden immersion in cold water
- D. Death occurs in few days of submersion episode
Explanation: ***Water does not enter lungs because of laryngeal spasm*** - In **dry drowning**, water does not directly enter the lungs but instead causes **laryngospasm**, leading to **suffocation**. - This **reflexive closure of the larynx** prevents water from entering the trachea and bronchial tree during submersion. *Seen in alcoholics due to drowning in shallow pool* - While alcohol consumption can be a factor in drowning incidents, **dry drowning** specifically refers to the mechanism of death due to laryngospasm, not necessarily the circumstances or risk factors. - Drowning in a shallow pool is a circumstance of drowning; it does not define the physiological mechanism of dry drowning. *Death occurs due to sudden immersion in cold water* - Death due to sudden immersion in cold water often leads to **cardiac arrest** (cold shock response) or **hypothermia**, which are different mechanisms from the laryngospasm seen in dry drowning. - Although these can be contributing factors in some drowning deaths, they are not the primary cause of death in dry drowning. *Death occurs in few days of submersion episode* - Death occurring days after a submersion episode is typical of **secondary drowning** (also known as delayed drowning or "wet drowning" with subsequent complications), where inhaled water causes **acute respiratory distress syndrome (ARDS)** or other pulmonary issues. - In **dry drowning**, death occurs rapidly due to **asphyxia** from laryngospasm and not delayed respiratory complications.
Question 3: Which of the following is a feature of manual strangulation?
- A. Petechial hemorrhages
- B. Frothy discharge
- C. Hyoid bone fracture (Correct Answer)
- D. Cyanosis
Explanation: ***Hyoid bone fracture*** - **Hyoid bone fractures** are a characteristic feature of manual strangulation, occurring in 30-50% of cases - More commonly seen in adults over 40 years when the hyoid bone is ossified - Indicates significant focal force applied to the anterior neck, making it a valuable forensic finding - While not present in all cases, when found it is highly suggestive of manual strangulation *Petechial hemorrhages* - **Petechial hemorrhages** are actually very common in manual strangulation (70-90% of cases) - Result from venous obstruction with continued arterial flow, causing capillary rupture - Seen in conjunctivae, face, and internal organs (lungs, heart) - While they can occur in other forms of asphyxia, in the context of neck findings they are highly significant - The question asks for "a feature" and hyoid fracture is chosen as it's more specific when present *Frothy discharge* - **Frothy discharge** from nose and mouth is typically associated with drowning or pulmonary edema - Results from fluid mixing with air in the airways - Not a characteristic finding in manual strangulation *Cyanosis* - **Cyanosis** is a non-specific sign that can occur in any form of asphyxia - Results from hypoxia and increased deoxygenated hemoglobin - May be present in strangulation but doesn't help identify the mechanism of death
Question 4: Cause of death for drowning in cold water:
- A. Inability to breathe (asphyxia) (Correct Answer)
- B. Loss of consciousness due to hypoxia
- C. Cardiac arrest due to vagal inhibition
- D. Cardiac arrest due to ventricular fibrillation
Explanation: ***Inability to breathe (asphyxia)*** - Drowning fundamentally involves **inhalation of water** into the airway, which prevents gas exchange in the lungs, leading to **asphyxia**. - In cold water, the initial gasp reflex can lead to rapid aspiration of water, causing immediate **laryngospasm** and closure of the airway, resulting in inability to breathe. - Asphyxia remains the **most common mechanism** across all types of drowning, including cold water cases. *Loss of consciousness due to hypoxia* - While **hypoxia** certainly occurs in drowning due to lack of gas exchange, loss of consciousness is a *consequence* of prolonged asphyxia, not the primary cause of death. - The immediate cause of death is the inability to oxygenate the blood due to water filling the lungs or severe laryngospasm. *Cardiac arrest due to vagal inhibition* - **Vagal inhibition** (also called **hydrocution** or **immersion syndrome**) is an important mechanism specifically in **cold water drowning**. - Sudden immersion in cold water can trigger massive vagal stimulation leading to immediate cardiac arrest (often asystole) before significant water aspiration occurs. - However, this mechanism occurs in a **minority of cold water drowning cases**, while asphyxia remains the predominant cause of death overall. *Cardiac arrest due to ventricular fibrillation* - **Ventricular fibrillation** can be a terminal event in drowning, often secondary to severe hypoxia and hypothermia, but it is usually not the initial or primary cause of death. - The cessation of breathing and subsequent lack of oxygen directly lead to organ failure, including cardiac dysrhythmias, rather than ventricular fibrillation being the independent initial event.
Question 5: Immersion syndrome is also known as?
- A. Hydrocution (Correct Answer)
- B. Wet drowning
- C. Dry drowning
- D. Secondary drowning
Explanation: ***Hydrocution*** - **Immersion syndrome**, or hydrocution, is a sudden death that occurs immediately upon immersion in cold water. - It is believed to be caused by a **vasovagal reflex** triggered by the sudden temperature change, leading to cardiac arrest. *Wet drowning* - This term refers to conventional drowning where an individual inhales water, leading to respiratory compromise and death. - It is characterized by the presence of **fluid in the lungs**, which is not the primary mechanism in immersion syndrome. *Dry drowning* - **Dry drowning** occurs when water does not enter the lungs; instead, the glottis spasms and closes, preventing air and water from entering. - This leads to suffocation, often hours after the initial water exposure, and is distinct from the immediate cardiac event of immersion syndrome. *Secondary drowning* - **Secondary drowning**, or delayed drowning, refers to complications that arise hours or days after a near-drowning incident due to inhaled water causing pulmonary edema. - It involves a delayed physiological response rather than an immediate reflex.
Question 6: The dead body of a child was recovered from a river with froth around his mouth, which reappeared even after wiping it off. Which postmortem finding is not seen in this case?
- A. High concentration of arsenic from shaft of hair (Correct Answer)
- B. Voluminous and ballooned out lungs
- C. Cadaveric spasm with mud in closed fist
- D. Paltauf's hemorrhage in sub pleura
Explanation: ***High concentration of arsenic from the shaft of hair*** - The presence of arsenic in hair is indicative of chronic **arsenic poisoning**, which is unrelated to drowning. - The scenario describes a body recovered from a river with froth, suggesting **drowning**, not poisoning. *Voluminous and ballooned out lungs* - This is a classic postmortem finding in drowning due to the aspiration of water and air trapping, leading to **pulmonary emphysema acquosum**. - The lungs appear large and distended, often with impressions of the ribs on their surfaces. *Cadaveric spasm with mud in a closed fist* - **Cadaveric spasm** (instantaneous rigor) can occur in cases of violent death, intense physical exertion, or emotional stress just before death, often seen in drowning victims. - Finding foreign material like mud or weeds clutched tightly in the hand is a significant indicator that the victim was **alive and struggling** in the water during submersion. *Paltauf's hemorrhage in subpleura* - **Paltauf's hemorrhages** are small, pinpoint hemorrhages found under the pleural surface (subpleural) and are a characteristic sign of drowning. - They result from the rupture of capillaries due to the sudden increase in intrathoracic pressure during the struggle to breathe underwater.
Question 7: In a case of drowning, which of the following is considered a definitive sign of antemortem drowning?
- A. Presence of water in lungs
- B. Presence of washerwoman’s hand
- C. Presence of froth at mouth (Correct Answer)
- D. Presence of water in stomach
Explanation: ***Presence of froth at mouth*** - The formation of **fine, white, often mushroom-shaped froth** at the mouth and nostrils is a result of the agitation of airway fluid, mucus, and air during attempts to breathe and is a key sign of live drowning. - This **stable foam** is a consequence of vital reaction to water aspiration and is rarely seen in postmortem submersion. *Presence of water in lungs* - While water in the lungs is a common finding in drowning, it can also occur in **postmortem submersion** due to passive diffusion and hydrostatic pressure. - Therefore, its presence alone is **not a definitive sign** of antemortem drowning. *Presence of washerwoman’s hand* - This refers to the **pale, wrinkled appearance of the skin** of the hands and feet due to prolonged immersion in water. - It is an indication of **prolonged immersion**, not necessarily that the drowning occurred while the person was alive; it can be seen in both antemortem and postmortem submersion. *Presence of water in stomach* - Aspiration of water into the stomach can occur during both **antemortem and postmortem submersion**. - During postmortem submersion, water can passively enter the stomach due to **hydrostatic pressure** or during retrieval.
Question 8: Gettler's test is used to diagnose death due to:
- A. Drowning (Correct Answer)
- B. Strangulation
- C. Hanging
- D. Burns
Explanation: ***Drowning*** - **Gettler's test** is a specific diagnostic test for **drowning** that compares the **chloride concentrations** in blood from the **left and right sides of the heart**. - In freshwater drowning, water enters the bloodstream causing **hemodilution** in the left heart, resulting in **lower chloride levels** compared to the right heart. - In saltwater drowning, the opposite occurs with **higher chloride concentration** in the left heart due to hypertonic fluid absorption. - A **difference of >25 mg/dL** in chloride levels between the two sides suggests drowning, though the test has **limited reliability** and is not routinely used in modern forensic practice. *Strangulation* - **Strangulation** involves mechanical compression of the neck structures causing cerebral hypoxia and asphyxia. - Diagnosed by findings like **petechiae** (conjunctival and facial), **ligature marks**, **laryngeal fractures**, and **neck soft tissue hemorrhage**. - Gettler's test is irrelevant as strangulation does not cause significant fluid shifts between cardiac chambers. *Hanging* - **Hanging** is a form of ligature strangulation caused by suspension of the body by a ligature around the neck. - Characteristic findings include **inverted V-shaped ligature mark** (highest at the point of suspension), **hyoid bone fracture**, and signs of asphyxia. - Diagnosis relies on neck examination and postmortem findings, not cardiac chloride level differences. *Burns* - Death from **burns** results from extensive thermal tissue damage, fluid loss, shock, or smoke inhalation. - Diagnosed by the extent of body surface area burned, presence of **soot in airways** (indicating antemortem inhalation), and thermal injury patterns. - Gettler's test has no application in thermal injury deaths as it specifically addresses fluid electrolyte shifts in drowning.
Question 9: Which of the following is not a feature of manual strangulation?
- A. Hyoid bone fracture
- B. Petechial hemorrhages
- C. Frothy discharge (Correct Answer)
- D. Cyanosis
Explanation: ***Frothy discharge*** - **Frothy discharge** from the mouth or nose is characteristic of **drowning** or acute pulmonary edema, not manual strangulation. - Frothy discharge results from air mixing with fluid in the lungs and airways, which is not a typical mechanism in manual strangulation. - Manual strangulation causes mechanical compression of the neck, not the fluid accumulation in airways that produces frothy discharge. *Hyoid bone fracture* - **Hyoid bone fractures** are common in manual strangulation, especially in older individuals (>40 years), due to the direct compression of the neck. - The force applied to the neck can directly crush or compress the hyoid bone, leading to its fracture. *Petechial hemorrhages* - **Petechial hemorrhages** (small pinpoint bleeding spots) in the eyes and face are a classic sign of manual strangulation. - These result from increased venous pressure above the obstruction in the neck, causing small capillaries to rupture. *Cyanosis* - **Cyanosis**, a bluish discoloration of the skin and mucous membranes, is a common feature due to oxygen deprivation from venous and arterial occlusion. - The lack of oxygenated blood circulating, particularly in visible areas, causes the skin to appear blue.
Question 10: The dead body of a 20 year old man found in the sea was brought in for postmortem examination. Which of the following findings would you see in seawater drowning? 1. Hemoconcentration 2. Pulmonary edema 3. Hyponatremia 4. Hypernatremia 5. Hemolysis
- A. 2,4 and 5
- B. 2,3 and 5
- C. 1 and 3
- D. 1 and 4 (Correct Answer)
Explanation: ***1 and 4*** - In **seawater drowning**, the hypertonic seawater (3-4% salt) creates an osmotic gradient that pulls plasma fluid from the blood into the alveoli, leading to **hemoconcentration**. - The absorption of hypertonic seawater into the bloodstream results in **hypernatremia** and hyperchloremia. - These are the characteristic electrolyte and hematologic findings specific to seawater drowning. *2, 4 and 5* - While **hypernatremia** is correct, this option incorrectly includes **pulmonary edema** (which is non-specific to drowning type) and **hemolysis** (which is characteristic of freshwater drowning, not seawater). - **Hemolysis** occurs in freshwater drowning when hypotonic water enters the bloodstream, causing red blood cells to swell and lyse. *2, 3 and 5* - This option is incorrect as it includes findings characteristic of **freshwater drowning**: **hyponatremia** and **hemolysis**. - In freshwater drowning, hypotonic water absorption causes hemodilution (not hemoconcentration), leading to hyponatremia and hemolysis. - **Pulmonary edema** is present in both types but does not differentiate between them. *1 and 3* - While **hemoconcentration** is correct for seawater drowning, **hyponatremia** is incorrect. - Hyponatremia is a feature of freshwater drowning due to dilution of serum sodium by absorbed hypotonic water.
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