Infanticide Practice Questions

Q: In forensic medicine, the hydrostatic test is primarily used to determine which of the following conditions in a deceased infant?

Evidence of infanticide. ### Explanation The **Hydrostatic Test** (also known as the **Raygat’s Test** or **Floatation Test**) is a classic forensic procedure used to determine whether a child was **born alive** or was **stillborn**. This distinction is the cornerstone of investigating suspected **infanticide**. #### Why the Correct Answer is Right: The test is based on the physiological principle that once an infant takes its first breath, the lungs expand and air fills the alveoli. This reduces the specific gravity of the lung tissue (from ~1.050 to ~0.950), making it lighter than water. * **Positive Test (Floating):** Indicates the infant breathed (live birth). * **Negative Test (Sinking):** Indicates the lungs never expanded (stillbirth). In cases of suspected infanticide, proving a "live birth" is the first legal requirement for a homicide charge. #### Why Incorrect Options are Wrong: * **Options A, B, and C (Drowning):** While these involve water, the hydrostatic test is unrelated to the mechanism of drowning. Drowning in adults or children is diagnosed via different findings, such as **Getter’s Test** (chloride levels), **diatom analysis**, or the presence of **fine, leathery froth** at the mouth/nostrils. #### NEET-PG High-Yield Pearls: * **False Positives (Floating despite stillbirth):** Can occur due to **putrefaction** (gas formation) or artificial respiration. * **False Negatives (Sinking despite live birth):** Can occur in cases of **atelectasis**, severe pneumonia, or pulmonary edema. * **Static Test (Fodere’s Test):** Involves weighing the lungs. The **Ploucquet’s Test** compares the lung weight to the total body weight (Ratio is ~1:70 for live birth and ~1:35 for stillbirth). * **Wredin’s Test:** Checks for the presence of air in the middle ear (another sign of live birth).

Q: What is the average weight of a fetal lung after respiration?

60-70 gm. **Explanation:** The weight of the fetal lungs is a critical parameter in forensic pathology used to determine whether a newborn was born alive (live birth) or was a stillbirth. This is based on the physiological changes that occur during the transition from intrauterine to extrauterine life. **1. Why Option C is Correct:** In a full-term fetus, the lungs undergo a dramatic change upon the initiation of respiration. Before birth, the lungs are collapsed and contain only a small amount of fetal lung fluid. Once the infant breathes, the pulmonary vasculature opens, and there is a massive increase in blood flow to the lungs. * **Pre-respiration (Stillborn) weight:** Approximately **30–40 grams**. * **Post-respiration (Live birth) weight:** Approximately **60–70 grams**. The weight nearly doubles due to the increased pulmonary congestion and the presence of air. **2. Analysis of Incorrect Options:** * **Option A (30-40 gm):** This is the average weight of lungs in a **stillborn** fetus (before respiration). * **Option B (40-50 gm):** This represents an intermediate or underweight range, often seen in premature infants or cases of partial respiration/atelectasis. * **Option D (90-100 gm):** This weight is excessive for a newborn and would typically indicate pathology such as pulmonary edema, pneumonia, or hemorrhage. **3. NEET-PG High-Yield Clinical Pearls:** * **Static Test (Foderé’s Test):** Simply involves weighing the lungs. A weight >60g suggests live birth. * **Hydrostatic Test (Raygat’s Test):** Based on the principle that lungs that have breathed will float in water (Specific Gravity changes from ~1.050 to ~0.950). * **Ploucquet’s Test:** The ratio of lung weight to total body weight. * **Stillborn:** 1:70 * **Live born:** 1:35 * **Caution:** Putrefaction can cause a stillborn lung to float due to decomposition gases (False Positive Hydrostatic test).

Q: In a new-born, the autopsy is typically initiated by opening which cavity first?

Abdomen. **Explanation:** In a neonatal autopsy, the **Abdomen** is opened first to assess the **height of the diaphragm**, which is a critical indicator of whether the infant was born alive or stillborn. 1. **Why Abdomen is Correct:** Before any other organ is disturbed, the pathologist must check the position of the diaphragm. In a live-born infant who has breathed, the lungs expand, pushing the diaphragm down to the level of the **5th or 6th rib**. In a stillborn infant, the diaphragm remains higher, at the level of the **3rd or 4th rib**. Opening the abdomen first allows for this measurement without causing artificial pressure changes or air entry into the thoracic cavity. 2. **Why others are incorrect:** * **Head:** Opening the head first is avoided because it can lead to the drainage of blood from the thoracic vessels, potentially interfering with the assessment of heart and lung congestion. * **Chest:** Opening the chest first would immediately alter the intrathoracic pressure, making it impossible to accurately determine the original height of the diaphragm. * **Back:** This is not a standard primary incision site for assessing viability or major organ pathology in neonates. **High-Yield Clinical Pearls for NEET-PG:** * **Hydrostatic Test (Raygat’s Test):** Based on the principle that lungs that have breathed will float in water. It is the most common test for live birth, though decomposition can yield false positives. * **Wredin’s Test:** Presence of air in the middle ear indicates live birth. * **Breslau’s Second Life Test:** Presence of air in the stomach and intestines suggests the infant lived and swallowed air. * **Maceration:** A sterile autolytic process seen in intrauterine death (stillbirth); it never occurs in a live-born infant.

Q: What does a hydrostatic test help to determine?

Live birth. **Explanation:** The **Hydrostatic Test** (also known as the Raygat’s test or Docimasia pulmonum) is a classic medicolegal procedure used to differentiate between a **live birth** and a **stillbirth**. **Why the correct answer is right:** When a child is born alive and takes its first breath, the lungs expand with air. This air reduces the specific gravity of the lung tissue (from ~1.050 to ~0.950), making it lighter than water. In this test, the lungs (or segments of them) are placed in water; if they **float**, it indicates the child breathed (live birth). If they sink, it suggests the lungs are atelectatic (stillbirth). **Why the incorrect options are wrong:** * **Presence of smegma:** Smegma is a sebaceous secretion found under the prepuce or labia; its presence is used to assess the hygiene or physical maturity of a newborn, not lung aeration. * **Criminal abortion:** Evidence for criminal abortion typically involves looking for local trauma to the cervix/vagina, presence of foreign bodies, or chemical irritants, not lung buoyancy. * **Buccal coitus:** This is a form of sexual assault. Diagnosis relies on the presence of semen, acid phosphatase, or DNA swabs from the oral cavity. **High-Yield Clinical Pearls for NEET-PG:** * **False Positive (Floating despite stillbirth):** Occurs due to **putrefaction** (gas formation) or artificial respiration. * **False Negative (Sinking despite live birth):** Occurs in cases of pulmonary edema, pneumonia, or extreme atelectasis. * **Static Test (Fodere’s Test):** Involves weighing the lungs. A live-born lung is heavier due to increased pulmonary blood flow (approx. 1/35th of body weight) compared to a stillborn lung (approx. 1/70th). * **Wredin’s Test:** Examination of the middle ear; disappearance of the gelatinous embryonic connective tissue indicates live birth.

Q: Which test involves comparing the weight of the lungs to the body weight?

Ploucquet's Test. **Explanation:** In cases of suspected infanticide, the primary objective is to determine whether the child was born alive or was a stillbirth. **Ploucquet’s Test** is based on the physiological change in pulmonary circulation that occurs at birth. Before birth, only a small fraction of blood flows to the lungs; once respiration begins, the pulmonary vessels dilate, significantly increasing the blood volume and weight of the lungs. * **Ploucquet’s Test (Correct):** It compares the ratio of lung weight to total body weight. * **Stillborn:** Ratio is approximately **1:70**. * **Live born:** Ratio increases to approximately **1:35** due to increased pulmonary vascularization. **Analysis of Incorrect Options:** * **A. Fodere’s Test (Static Test):** This involves observing the physical appearance of the lungs (color, consistency, and volume) and performing the hydrostatic test (Raygat’s) to see if they float in water. * **C. Raygat’s Test (Hydrostatic Test):** The most famous test for live birth. It relies on the presence of air in the alveoli. If the lungs float in water, it suggests the child breathed (live birth), though decomposition can cause false positives. * **D. Wredin’s Test (Ear Test):** This test examines the middle ear. In a stillborn, the middle ear is filled with embryonic gelatinous tissue. In a live-born child who has breathed, this tissue is replaced by air. **High-Yield Clinical Pearls for NEET-PG:** * **Breslau’s Second Life Test:** Involves checking for air in the stomach and intestines (Gastrointestinal Hydrostatic Test). * **Spalding’s Sign:** Overlapping of skull bones on X-ray, indicating intrauterine fetal death (maceration). * **Wredin’s Test** is also known as the **Middle Ear Test**. * **Ploucquet’s Test** is currently considered less reliable than histological examination because pathological conditions (like pneumonia or congestion) can alter lung weight.

Q: What is the cause of death in breech delivery?

Atlanto-axial dislocation. ### Explanation **Correct Option: C. Atlanto-axial dislocation** In forensic medicine and obstetrics, **atlanto-axial dislocation** is considered a classic cause of death specifically associated with **breech delivery**, particularly when excessive traction is applied to the trunk to deliver the after-coming head. The forceful pulling or hyperextension of the neck can lead to the separation of the first and second cervical vertebrae, resulting in fatal compression of the upper spinal cord or medulla oblongata. **Analysis of Incorrect Options:** * **A. Intracranial hemorrhage:** While common in difficult instrumental deliveries (like forceps) or precipitate labor, it is less specific to the mechanical trauma of breech extraction compared to cervical injury. * **B. Aspiration:** Though a fetus may aspirate amniotic fluid or meconium if gasping occurs in utero (due to cord compression), it is rarely the immediate, primary cause of death during the delivery process itself. * **D. Asphyxia:** While asphyxia is a frequent *mode* of death in many neonatal scenarios (e.g., cord prolapse), atlanto-axial dislocation is the specific *mechanical* cause of death linked to the maneuvers used in breech presentations. **High-Yield Facts for NEET-PG:** * **Wredin’s Sign:** Presence of a gelatinous substance in the middle ear of a newborn, indicating the child was born alive (though its reliability is debated). * **Hydrostatic Test (Raygat’s Test):** Used to determine if a child was born alive by checking if the lungs float in water. * **Spalding’s Sign:** Overlapping of skull bones seen on X-ray, indicating intrauterine fetal death (maceration). * **Fracture of the Clavicle:** The most common bone fractured during a difficult labor (shoulder dystocia).

Q: Raygat's test is used for what purpose?

Determining the specific gravity of the lung. **Explanation:** **Raygat’s Test** (also known as the **Hydrostatic Test** or Floatation Test) is a classic medicolegal procedure used during the autopsy of a newborn to determine whether the infant was **born alive** (live birth) or was **stillborn**. 1. **Why Option B is Correct:** The fundamental principle of Raygat’s test is the change in the **specific gravity** of the lungs. * **In a Stillborn:** The lungs are solid, liver-like (atelectatic), and contain no air. Their specific gravity is approximately **1.040 to 1.050**, which is heavier than water (1.000), causing them to sink. * **In a Live Birth:** Once the infant breathes, air enters the alveoli, expanding the lungs and significantly lowering their specific gravity to approximately **0.940**. This makes the lungs lighter than water, causing them to float. 2. **Why Other Options are Incorrect:** * **Option A:** While the weight of the lung increases after respiration due to increased pulmonary blood flow (Fodere’s Test), Raygat’s test specifically measures buoyancy/density, not absolute weight. * **Option C:** Consistency changes (from firm/liver-like to spongy/crepitant) are qualitative observations made during the "Static Test," not the specific metric measured by Raygat’s test. **High-Yield Clinical Pearls for NEET-PG:** * **False Positives (Floating despite stillbirth):** Occurs due to **putrefaction** (gas formation) or artificial respiration. * **False Negatives (Sinking despite live birth):** Occurs in cases of severe pneumonia, pulmonary edema, or extreme atelectasis. * **Wredin’s Test:** A related test involving the presence of air in the middle ear to indicate live birth. * **Breslau’s Second Life Test:** Involves checking for air in the stomach and intestines.

Q: Which of the following is NOT typically found in a dead-born fetus?

Adipocere formation. ### Explanation The key to answering this question lies in understanding the environment of a **dead-born (stillborn) fetus**. A dead-born fetus dies *in utero* and remains within the sterile, fluid-filled amniotic sac until delivery. **Why Adipocere is the Correct Answer:** Adipocere (saponification) requires **external moisture** and the presence of **microorganisms** (specifically anaerobic bacteria like *Clostridium perfringens*) to convert body fats into hydroxy fatty acids. Since the intrauterine environment is **sterile**, the bacterial action necessary for adipocere formation is absent. Therefore, adipocere is not typically seen in a fetus that died before birth. **Analysis of Incorrect Options:** * **Maceration (Option C):** This is the **hallmark** of intrauterine death. It is a sterile autolytic process where the fetus is soaked in amniotic fluid. Signs include skin slipping, bullae formation, and the Spalding sign (overlapping of cranial bones). * **Mummification (Option D):** This occurs if the amniotic fluid is deficient (oligohydramnios) or absorbed after fetal death. The fetus becomes shriveled, dry, and leathery. It is common in cases of "fetus papyraceus" in twin pregnancies. * **Rigor Mortis (Option A):** While rare and transient, rigor mortis can occur in a dead-born fetus if the death occurred shortly before delivery, though it passes quickly due to the rapid onset of maceration. **NEET-PG High-Yield Pearls:** * **Maceration** takes at least **12–24 hours** of intrauterine death to manifest clinically. * **Spalding’s Sign:** Overlapping of skull bones due to liquefaction of the brain; a radiological sign of fetal death. * **Wredin’s Test:** Presence of air in the middle ear (indicates live birth). * **Statutory Definition:** In India, a "dead-born" fetus is one that does not breathe or show any other sign of life after complete expulsion, provided it has reached **28 weeks** of gestation (viability).

Question 1

In forensic medicine, the hydrostatic test is primarily used to determine which of the following conditions in a deceased infant?

Accepted Answer

Evidence of infanticide

Answer

The presence of dry drowning

Answer

The presence of wet drowning

Answer

The circumstances of near drowning

Question 2

Changes in the middle ear after birth are observed in?

Accepted Answer

Werdin's test

Answer

Ploucquet's test

Answer

Fodere's test

Answer

Breslau's test

Question 3

What is the average weight of a fetal lung after respiration?

Accepted Answer

60-70 gm

Answer

30-40 gm

Answer

40-50 gm

Answer

90-100 gm

Question 4

In a new-born, the autopsy is typically initiated by opening which cavity first?

Accepted Answer

Abdomen

Answer

Head

Answer

Chest

Answer

Back

Question 5

What does a hydrostatic test help to determine?

Accepted Answer

Live birth

Answer

Presence of smegma

Answer

Criminal abortion

Answer

Buccal coitus

Question 6

Macerated foetus indicates:

Accepted Answer

Dead born

Answer

Still born

Answer

Live born

Answer

Intrauterine growth restriction

Question 7

Which test involves comparing the weight of the lungs to the body weight?

Accepted Answer

Ploucquet's Test

Answer

Fodere's Test

Answer

Raygat's Test

Answer

Wredin Test/Cavette test

Question 8

What is the cause of death in breech delivery?

Accepted Answer

Atlanto-axial dislocation

Answer

Intracranial hemorrhage

Answer

Aspiration

Answer

Asphyxia

Question 9

Raygat's test is used for what purpose?

Accepted Answer

Determining the specific gravity of the lung

Answer

Determining the weight of the lung

Answer

Determining the consistency of the lung

Answer

None of the above

Question 10

Which of the following is NOT typically found in a dead-born fetus?

Accepted Answer

Adipocere formation

Answer

Rigor mortis

Answer

Maceration

Answer

Mummification

Infanticide — MCQs

Infanticide — MCQs

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