Neonatology and Perinatology Practice Questions

Q: Which of the following is NOT a common complication in a neonate born to a mother with diabetes mellitus?

Hypercalcemia. In infants of diabetic mothers (IDM), the primary pathophysiology is **maternal hyperglycemia** leading to **fetal hyperinsulinemia**. **Why Hypercalcemia is the Correct Answer:** Neonates born to diabetic mothers typically experience **Hypocalcemia**, not hypercalcemia. This occurs because maternal diabetes is often associated with maternal magnesium loss, leading to fetal hypomagnesemia. Low magnesium levels suppress the secretion of Parathyroid Hormone (PTH) in the neonate, resulting in transient hypocalcemia within the first 24–72 hours of life. **Analysis of Incorrect Options:** * **Hypoglycemia:** This is the most common metabolic complication. High maternal glucose crosses the placenta, stimulating fetal pancreatic beta cells. After birth, the glucose supply is cut off, but the neonate’s hyperinsulinemia persists, causing a rapid drop in blood sugar. * **Hypokalemia:** This occurs secondary to hyperinsulinemia. Insulin shifts potassium from the extracellular space into the cells. * **Obesity:** IDMs are often macrosomic (Large for Gestational Age) due to the anabolic effects of insulin. These children have a significantly higher risk of developing childhood obesity and Type 2 Diabetes later in life. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cardiac anomaly:** Ventricular Septal Defect (VSD). * **Most specific cardiac anomaly:** Transposition of the Great Arteries (TGA). * **Most characteristic anomaly:** Caudal Regression Syndrome (Sacral Agenesis). * **Other complications:** Polycythemia (due to fetal hypoxia), Hyperbilirubinemia, and Respiratory Distress Syndrome (insulin inhibits surfactant production by antagonizing cortisol).

Q: Low birth weight baby is defined as a baby weighing:

2500 gm. ### Explanation The classification of birth weight is a fundamental concept in perinatology, used globally to predict neonatal morbidity and mortality. **1. Why the Correct Answer is Right:** According to the **World Health Organization (WHO)**, a **Low Birth Weight (LBW)** baby is defined as a neonate whose birth weight is **less than 2500 grams (up to and including 2499 g)**, regardless of the gestational age. This cutoff is significant because infants weighing less than 2500g have a substantially higher risk of complications such as hypoglycemia, hypothermia, and respiratory distress. **2. Analysis of Incorrect Options:** * **A. 1000 gm:** This defines **Extremely Low Birth Weight (ELBW)**. These infants are at the highest risk and often require intensive NICU care. * **B. 1500 gm:** This defines **Very Low Birth Weight (VLBW)**. Babies in this category (1001g to 1500g) have significantly higher mortality rates than standard LBW babies. * **C. 2000 gm:** While clinically concerning, this does not represent a formal WHO classification threshold. **3. High-Yield Clinical Pearls for NEET-PG:** * **LBW Sub-classifications:** * **LBW:** 4000 g** (some guidelines use > 4500 g), commonly associated with maternal diabetes. * **Small for Gestational Age (SGA):** Refers to a birth weight below the **10th percentile** for that specific gestational age. * **Ponderal Index:** Used to differentiate between symmetrical and asymmetrical IUGR. * **Incidence:** India has one of the highest incidences of LBW globally, primarily due to maternal malnutrition and anemia.

Q: A baby is born with a large defect in the occipital bone through which the posterior portion of the brain has herniated. Which of the following terms best describes this lesion?

Encephalocele. ### Explanation **Correct Option: A. Encephalocele** An **encephalocele** is a neural tube defect (NTD) characterized by a sac-like protrusion of the brain and the membranes covering it (meninges) through an opening in the skull. In this case, the herniation of the "posterior portion of the brain" through an occipital bone defect fits the definition perfectly. The most common site for encephalocele is the **occipital region** (75% of cases). **Analysis of Incorrect Options:** * **B. Meningocele:** This refers to the herniation of the **meninges only** (dura and arachnoid) through a defect in the skull or vertebral column, without any neural tissue (brain or spinal cord) inside the sac. * **C. Myelocele:** This is a type of *Spina Bifida Cystica* where the spinal cord is exposed to the exterior, but it specifically involves the **spinal column**, not the cranium/occipital bone. * **D. Spina bifida:** This is a broad term for NTDs involving the **vertebral column** (spinal arches). It does not describe defects in the occipital bone or herniation of brain tissue. **NEET-PG High-Yield Pearls:** 1. **Etiology:** Like most NTDs, encephaloceles are associated with **folic acid deficiency** during the first trimester. 2. **Diagnosis:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum and amniotic fluid is a key screening marker. 3. **Meckel-Gruber Syndrome:** A high-yield triad to remember is **Occipital Encephalocele + Polydactyly + Polycystic Kidneys**. 4. **Prognosis:** Occipital encephaloceles often contain the visual cortex or cerebellum; the prognosis depends on the amount of brain tissue herniated and the presence of associated hydrocephalus.

Q: During a clinical examination, a senior resident asks an intern to examine the umbilical cord. How many arteries and veins are normally present in a healthy umbilical cord?

1 vein and 2 arteries. ***1 vein and 2 arteries*** - The normal configuration of a healthy umbilical cord is three vessels: **two umbilical arteries** and **one umbilical vein**. - The **umbilical vein** transports oxygenated blood from the placenta to the fetus, whereas the **two umbilical arteries** carry deoxygenated blood and metabolic waste from the fetus back to the placenta. *1 artery and 2 veins* - This configuration is incorrect; normally, the right umbilical vein **atrophies** early in gestation, leaving only a single left umbilical vein. - A cord with two veins suggests a **developmental anomaly** and is not the standard finding. *1 artery and 1 vein* - This pattern is an anomaly known as a **Single Umbilical Artery (SUA)**, which is found in 0.5% to 1% of pregnancies. - SUA is clinically significant as it is associated with an increased risk of **congenital anomalies**, especially renal, cardiac, and chromosomal defects. *2 arteries and 2 veins* - This is an abnormal configuration; while two arteries are standard, the presence of two veins instead of one is due to the failure of the **right umbilical vein** to involute, which is typically a normal event. - The persistence of two veins is highly **atypical** and often requires specialized fetal surveillance.

Q: A Lethargic hypoglycemic girl neonate has the following genital appearance. What is the probable cause? (Recent Neet Pattern 2016-17)

Congenital adrenal hyperplasia. ***Congenital adrenal hyperplasia*** - The image shows **ambiguous genitalia (clitoromegaly/phallic structure with fused labia)** in a neonate presenting with **lethargy and hypoglycemia**, which are symptoms of **salt-wasting crisis**. - This clinical picture in a presumed genetic female is highly suggestive of **21-hydroxylase deficiency**, the most common form of CAH, leading to excess adrenal androgens and mineralocorticoid deficiency. *Ovotesticular disorder of sexual differentiation* - This condition involves the presence of both **ovarian and testicular tissue**, leading to ambiguous genitalia. - While it can cause ambiguous genitalia, it does not typically present with the acute metabolic crisis (hypoglycemia, lethargy) seen in this neonate, which points to a hormonal deficiency. *Turner syndrome* - **Turner syndrome (45, XO)** affects genetic females and is characterized by the absence of one X chromosome, typically resulting in **female external genitalia** that are usually normal or immature. - It does not cause ambiguous genitalia or the metabolic derangements (hypoglycemia) characteristic of adrenal insufficiency. *Klinefelter syndrome* - **Klinefelter syndrome (47, XXY)** affects genetic males and typically presents with **normal male external genitalia** at birth. - Features like hypogonadism and gynecomastia become apparent later in puberty, and it is not associated with ambiguous genitalia or neonatal metabolic crises.

Q: Which of the following can be a complication in the baby due to post maturity of pregnancy ?

Meconium aspiration. ***Meconium aspiration*** - **Post-term pregnancies** (>42 weeks) are associated with **oligohydramnios** and **placental insufficiency**, leading to fetal distress - Fetal distress causes passage of **meconium** into amniotic fluid, which can be aspirated during gasping movements - **Meconium aspiration syndrome** is one of the **most characteristic complications** of post-maturity - This is the **most recognized** complication among the options listed *Hypoglycemia* - Post-term infants **ARE actually at risk** for hypoglycemia - Mechanism: **Placental insufficiency** leads to depleted fetal **glycogen stores** and subcutaneous fat - However, this is **less specific** to post-term pregnancy compared to meconium aspiration, as it occurs in multiple conditions - While medically correct, meconium aspiration is the more characteristic complication *Intraventricular hemorrhage* - This is primarily a complication of **prematurity**, especially in very low birth weight infants - Caused by fragility of the **germinal matrix** in preterm brains - **Not associated with post-term pregnancy** *Polycythemia* - Post-term infants **can develop polycythemia** (hematocrit >65%) - Mechanism: Chronic **placental insufficiency** → fetal hypoxia → increased **erythropoietin production** - While this is a recognized complication, **meconium aspiration** remains the **most classic and frequently tested** complication of post-maturity

Question 1

Vaginal defense is lost:

Accepted Answer

After 10 days of birth

Answer

Within 10 days of birth

Answer

During pregnancy

Answer

At puberty

Question 2

Which of the following is NOT a common complication in a neonate born to a mother with diabetes mellitus?

Accepted Answer

Hypercalcemia

Answer

Hypokalemia

Answer

Hypoglycemia

Answer

Obesity

Question 3

What are the characteristics after 28 weeks of gestation?

Accepted Answer

All of the above

Answer

Viable

Answer

> 1000 gm

Answer

Type II pneumocytes present

Question 4

Low birth weight baby is defined as a baby weighing:

Accepted Answer

2500 gm

Answer

1000 gm

Answer

1500 gm

Answer

2000 gm

Question 5

A baby is born with a large defect in the occipital bone through which the posterior portion of the brain has herniated. Which of the following terms best describes this lesion?

Accepted Answer

Encephalocele

Answer

Meningocele

Answer

Myelocele

Answer

Spina bifida

Question 6

During a clinical examination, a senior resident asks an intern to examine the umbilical cord. How many arteries and veins are normally present in a healthy umbilical cord?

Accepted Answer

1 vein and 2 arteries

Answer

1 artery and 1 vein

Answer

2 arteries and 2 veins

Answer

1 artery and 2 veins

Question 7

A Lethargic hypoglycemic girl neonate has the following genital appearance. What is the probable cause? (Recent Neet Pattern 2016-17)

Accepted Answer

Congenital adrenal hyperplasia

Answer

Ovotesticular disorder of sexual differentiation

Answer

Turner syndrome

Answer

Klinefelter syndrome

Question 8

Which of the following can be a complication in the baby due to post maturity of pregnancy ?

Accepted Answer

Meconium aspiration

Answer

Hypoglycemia

Answer

Intraventricular hemorrhage

Answer

Polycythemia

Question 9

Meconium aspiration syndrome can be prevented by taking the following measures except :

Accepted Answer

Delivering the baby by emergency caesarean section

Answer

Amnioinfusion

Answer

Oropharyngeal suctioning

Answer

Suctioning of trachea through laryngoscope

Question 10

A woman suffering from active tuberculosis not on ATT has a full term vaginal delivery. All the following should be done except:

Accepted Answer

BCG should be given to the neonate

Answer

Neonate should be isolated from mother

Answer

Breastfeed the neonate

Answer

Neonate should be given INH

Neonatology and Perinatology — MCQs

Neonatology and Perinatology — MCQs

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