Viability of Newborn — MCQs
Pentagastrin stimulation test is used to assess which organ?
Which of the following is a criterion for infant at risk?
Best method to determine gestational age in decomposed fetus?
Uterine height is greater than gestational age of the patient in a case of all except -
What is Vagitus uterinus?
Which of the following should be considered a 'High risk infant'?
The test based on lung weight is useful in the diagnosis of live birth.
The image shows ossification centers at the lower end of the radius and ulna which are not fused, and the pisiform is present. Based on this, what is the most accurate conclusion about the age?
In forensic medicine, the hydrostatic test is primarily used to determine which of the following conditions in a deceased infant?
Changes in the middle ear after birth are observed in?
Viability of Newborn Indian Medical PG Practice Questions and MCQs
Question 1: Pentagastrin stimulation test is used to assess which organ?
- A. Lung
- B. Liver
- C. Stomach (Correct Answer)
- D. Heart
Explanation: ***Stomach*** - The **pentagastrin stimulation test** is used to assess the stomach's ability to secrete acid [1]. - Pentagastrin is a synthetic analog of **gastrin**, a hormone that stimulates gastric acid secretion from **parietal cells** [1]. *Lung* - The lung is primarily involved in **gas exchange** and is assessed through tests like spirometry, chest X-rays, and arterial blood gas analysis [2]. - Pentagastrin has no direct diagnostic role in assessing lung function. *Liver* - The liver's function is evaluated by tests such as liver enzymes (ALT, AST), bilirubin levels, and imaging studies like ultrasound or MRI. - Pentagastrin is not a relevant diagnostic tool for assessing liver health or function. *Heart* - Cardiac function is assessed with electrocardiograms (ECG), echocardiography, stress tests, and measurement of cardiac biomarkers. - Pentagastrin stimulation has no application in the diagnosis or evaluation of heart conditions.
Question 2: Which of the following is a criterion for infant at risk?
- A. Preeclampsia in pregnancy (Correct Answer)
- B. Has not taken 100 days folic acid
- C. Malpresentation during birth
- D. Working mothers
Explanation: ***Preeclampsia in pregnancy*** - **Preeclampsia** is a serious pregnancy complication characterized by high blood pressure and signs of damage to another organ system, most often the liver and kidneys. - Infants born to mothers with preeclampsia are at **significantly higher risk** for complications including **preterm birth**, **intrauterine growth restriction (IUGR)**, low birth weight, respiratory distress syndrome, and perinatal mortality. - This is a **universally recognized criterion** for identifying high-risk infants in maternal-child health programs and NICU protocols. - Such infants require close monitoring and specialized care from birth. *Has not taken 100 days folic acid* - Periconceptional **folic acid supplementation** (ideally starting 3 months before conception and continuing through early pregnancy) reduces the risk of **neural tube defects** in the fetus. - While lack of folic acid supplementation increases the risk of congenital anomalies during pregnancy, this historical factor alone does not classify the infant as "at risk" after birth unless an actual neural tube defect or other complication is present. - This is primarily a **pregnancy risk factor** rather than a postnatal infant risk criterion. *Malpresentation during birth* - **Malpresentation** (e.g., breech, transverse lie, face presentation) increases the risk of birth complications such as **birth asphyxia**, **birth trauma**, cord prolapse, and difficult delivery. - While malpresentation is recognized as a risk factor during delivery and such infants may require closer initial monitoring, **preeclampsia** represents a more comprehensive and persistent risk affecting multiple organ systems and long-term outcomes. - In the context of identifying high-risk infants for follow-up programs, maternal preeclampsia is a more significant criterion than malpresentation alone (assuming no birth complications occurred). *Working mothers* - A mother's employment status does not inherently classify an infant as "at risk" from a medical or developmental standpoint. - While **socioeconomic factors** and access to care can impact infant health, simply being a working mother is not a direct medical criterion for defining an infant as high-risk.
Question 3: Best method to determine gestational age in decomposed fetus?
- A. Head circumference
- B. Crown-rump length
- C. Femur length
- D. Foot length (Correct Answer)
Explanation: ***Foot length*** - **Foot length** is a reliable indicator of gestational age in a decomposed fetus because the foot is relatively **resistant to decomposition** and its growth is consistent throughout gestation. - This measurement correlates well with gestational age even when other body parts are too degraded for accurate assessment. *Head circumference* - **Head circumference** is significantly affected by decomposition, as the skull and soft tissues can undergo distortion, making accurate measurement difficult. - While generally useful in viable fetuses, its reliability decreases sharply with advanced decomposition. *Crown-rump length* - **Crown-rump length** is highly susceptible to inaccuracies in decomposed fetuses due to the fragility of the spine and neck, leading to potential stretching or compression. - This measurement requires an intact body to be reliable, which is often not the case in decomposition. *Femur length* - **Femur length** can be a useful indicator, but in advanced decomposition, the ends of the bone (epiphyses) may be damaged or detached, affecting the accuracy of the overall measurement. - While more resilient than soft tissues, it is generally less reliable than foot length when decomposition is extensive.
Question 4: Uterine height is greater than gestational age of the patient in a case of all except -
- A. Fibroid uterus
- B. Wrong dates
- C. Polyhydramnios
- D. IUGR (Correct Answer)
Explanation: ***IUGR*** - In **Intrauterine Growth Restriction (IUGR)**, the fetus is smaller than expected for gestational age, leading to a **fundal height** that measures less than the actual gestational age. - This condition is characterized by a **restricted growth rate** of the fetus, causing the uterine size to be disproportionately small. *Fibroid uterus* - The presence of **uterine fibroids** (leiomyomas) can increase the overall size of the uterus beyond what would be expected for a given gestational age. - These benign tumors add bulk to the uterine wall, leading to a **larger-than-expected uterine height**. *Wrong dates* - Incorrect estimation of the **Last Menstrual Period (LMP)** or date of conception can lead to a miscalculation of gestational age. - If the gestational age is **underestimated**, the actual uterine height will appear greater than the calculated gestational age. *Polyhydramnios* - **Polyhydramnios** is a condition characterized by an **excessive accumulation of amniotic fluid**, which distends the uterus. - Increased amniotic fluid volume leads to a significantly **larger uterine size** and a fundal height greater than the gestational age.
Question 5: What is Vagitus uterinus?
- A. An infection of vagina
- B. An infection of uterus
- C. A cry of unborn baby from uterus (Correct Answer)
- D. Infection of both vagina and uterus
Explanation: ***A cry of unborn baby from uterus*** - **Vagitus uterinus** refers to the **crying out** or **vocalization of a fetus** while still inside the uterus. - This rare phenomenon occurs when air somehow enters the uterus, allowing the fetal vocal cords to vibrate and produce a sound. *An infection of vagina* - This describes **vaginitis**, which is an inflammation of the vagina caused by infection (e.g., bacterial vaginosis, candidiasis) or other factors. - It does not involve any sound or crying from the fetus. *An infection of uterus* - This condition is known as **endometritis** (infection of the uterine lining) or **chorioamnionitis** (infection of the amniotic fluid and membranes during pregnancy). - These are inflammatory conditions of the uterus and do not involve fetal vocalization. *Infection of both vagina and uterus* - While possible to have both conditions concurrently, this description points towards a combination of **vaginitis** and **endometritis** or **chorioamnionitis**. - It has no relation to the fetal crying within the uterus.
Question 6: Which of the following should be considered a 'High risk infant'?
- A. Folic acid tablet not consumed
- B. Antenatal preeclampsia (Correct Answer)
- C. Working mother
- D. Mal-presentation
Explanation: ***Antenatal preeclampsia*** - **Preeclampsia** is a serious pregnancy complication characterized by high blood pressure and signs of damage to other organ systems, posing significant risks to both mother and fetus. - Infants born to mothers with preeclampsia are at higher risk for **preterm birth**, **intrauterine growth restriction (IUGR)**, and complications like **respiratory distress syndrome**, classifying them as high-risk. *Folic acid tablet not consumed* - Maternal non-consumption of **folic acid** primarily increases the risk of **neural tube defects (NTDs)** in the fetus, but this alone does not classify the infant as high-risk after birth unless an NTD is diagnosed. - While important for healthy fetal development, a lack of folic acid intake is a risk factor for a specific congenital anomaly, rather than a general high-risk infant indicator post-birth without further complications. *Working mother* - A mother's employment status, while potentially affecting access to childcare or breastfeeding routines, does not inherently categorize an infant as **high-risk** from a medical standpoint. - This is a social factor and not a direct indicator of increased medical vulnerability or adverse health outcomes for the infant. *Mal-presentation* - **Malpresentation** refers to an abnormal position of the fetus in the uterus at the time of delivery (e.g., breech). While it poses risks during labor and delivery, often necessitating a **cesarean section**, it does not automatically classify the infant as high-risk post-birth unless complications arose during delivery. - The risk is primarily associated with the birth process itself, and if the delivery is managed appropriately with no resulting trauma or compromise, the infant may not be considered high-risk.
Question 7: The test based on lung weight is useful in the diagnosis of live birth.
- A. Wredin's test
- B. Static test (Correct Answer)
- C. Breslau's second life test
- D. Hydrostatic test
Explanation: ***Static test*** - This test is based on the **absolute weight of the lungs** and is used to determine if they have undergone inflation with air after birth. - In a **stillborn fetus**, the lungs are dense and heavy (approximately 1/70th of body weight), while in a live birth, they are lighter due to air inflation (approximately 1/25th of body weight). *Wredin's test* - This test involves measuring the **chloride content of the fetal blood** and is used to estimate the time of death, not specifically live birth. - It differentiates between a stillborn and a liveborn by assessing the presence of **intrapartum asphyxia**. *Breslau's second life test* - This test is a **histological examination** of the lungs to look for evidence of vital reactions or gas exchange. - It involves examining **alveolar distension** and the presence of foreign material in the airways which indicate gasping or breathing movements. *Hydrostatic test* - This test determines if the lungs have **floated when placed in water**, indicating the presence of air from respiration. - It's a qualitative test and can be influenced by decomposition or artificial inflation, hence not solely based on lung weight.
Question 8: The image shows ossification centers at the lower end of the radius and ulna which are not fused, and the pisiform is present. Based on this, what is the most accurate conclusion about the age?
- A. <12 years
- B. 12-14 years
- C. 14-16 years (Correct Answer)
- D. <17.5 years
Explanation: **14-16 years** - The presence of the **pisiform** and unfused epiphyses at the **distal radius and ulna** is consistent with an age range of 14-16 years. The pisiform typically begins to ossify around 10-12 years in females and 12-14 years in males, while the distal radial and ulnar epiphyses usually fuse later, completing closure around 16-18 years. - In females, the distal radius begins ossifying around **12-14 years** and fuses around **16-17 years**. In males, it starts ossifying around 14 years and fuses around 17-18 years. The ulna follows a similar pattern, typically fusing a bit later than the radius. *<12 years* - While the pisiform may begin to ossify in some individuals around 10-12 years, the **distal radial and ulnar epiphyses are generally still widely open** and not yet nearing fusion at this age. - Many carpal bones would still be in earlier stages of development, and the overall skeletal maturity would be less advanced than depicted. *12-14 years* - During this period, the **pisiform is usually ossified**, but the **fusion of the distal radius and ulna has not typically begun**. The image shows the epiphyses of the radius and ulna are present but not yet fused, suggesting a slightly older age than 12-14 years, especially considering the advanced development of other carpal bones. - The epiphyses appear well-formed and distinct, indicating a stage where fusion is approaching but not yet initiated, which is usually after 14 years. *<17.5 years* - While this option is technically correct in that 14-16 years is less than 17.5 years, it is too broad and not the **most accurate conclusion**. The specific features like the absence of fusion in the distal radius and ulna help narrow down the age range more precisely. - After 17.5 years, especially in males, the **distal radial and ulnar epiphyses** would typically show signs of complete or near-complete fusion.
Question 9: In forensic medicine, the hydrostatic test is primarily used to determine which of the following conditions in a deceased infant?
- A. The presence of dry drowning
- B. The presence of wet drowning
- C. The circumstances of near drowning
- D. Evidence of infanticide (Correct Answer)
Explanation: ### 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).
Question 10: Changes in the middle ear after birth are observed in?
- A. Werdin's test (Correct Answer)
- B. Ploucquet's test
- C. Fodere's test
- D. Breslau's test
Explanation: ### Explanation The correct answer is **Werdin's test** (also known as the Middle Ear Test). #### 1. Why Werdin's Test is Correct In a fetus, the middle ear is filled with embryonic gelatinous connective tissue and lacks air. Once a child is born and takes its first breaths, air travels through the Eustachian tube into the middle ear, replacing this tissue. **Werdin's test** involves opening the tympanic cavity under water; if bubbles of air escape, it indicates that the child has breathed and was born alive. This is a crucial sign of live birth in forensic autopsies. #### 2. Why Other Options are Incorrect * **Ploucquet’s Test:** This is a hydrostatic test based on the **ratio of lung weight to total body weight**. In a stillborn, the ratio is approximately 1:70, while in a live-born infant (who has breathed), the ratio increases to about 1:35 due to increased pulmonary vascularization. * **Fodere’s Test (Static Test):** This involves observing the physical characteristics of the lungs (color, consistency, and volume). Lungs that have breathed are spongy, pale pink, and crepitant, whereas stillborn lungs are firm, liver-like (hepatization), and dark red. * **Breslau’s Test (Gastrointestinal Hydrostatic Test):** This test involves ligating the stomach and intestines and placing them in water. If they float, it suggests the infant swallowed air during respiration, indicating live birth. #### 3. High-Yield Clinical Pearls for NEET-PG * **Hydrostatic Test (Raygat’s Test):** The gold standard for live birth; it depends on the fact that lungs that have breathed will float in water. * **False Positive Hydrostatic Test:** Can occur due to **putrefaction** (gas formation) or artificial respiration. * **Spalding’s Sign:** A radiological sign of intrauterine death (overlapping of skull bones) seen 24–48 hours after fetal death. * **Werdin’s Test Timing:** Air usually reaches the middle ear within minutes of birth, making it a very early indicator of live birth.
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