Neonatology Practice Questions

Q: Hypoplasia of limb and scarring is caused by which of the following infections?

Varicella. **Explanation:** The clinical triad of **limb hypoplasia**, **cicatricial (zigzag) skin scarring**, and **neurological defects** (such as microcephaly or cortical atrophy) is characteristic of **Congenital Varicella Syndrome (CVS)**. This occurs when a pregnant woman is infected with the Varicella-Zoster Virus (VZV) during the first 20 weeks of gestation (peak risk at 13–20 weeks). The virus causes fetal denervation of the spinal cord and autonomic ganglia, leading to the failure of limb development and characteristic dermatomal scarring. **Analysis of Options:** * **Varicella (Correct):** Specifically associated with "cicatricial" skin lesions and hypoplastic extremities due to neurotrophic damage during organogenesis. * **Herpes Simplex:** Neonatal HSV is usually acquired during delivery (perinatal). It typically presents as SEM (Skin, Eye, Mouth) vesicles, encephalitis, or disseminated disease, rather than limb hypoplasia. * **Rubella:** Part of the "Gregg Triad"—Cataracts, Sensorineural hearing loss, and Congenital Heart Disease (PDA/Pulmonary artery stenosis). It also presents with a "Blueberry muffin" rash. * **Toxoplasma:** Characterized by the classic triad of Chorioretinitis, Hydrocephalus, and Intracranial calcifications (diffuse). **High-Yield Clinical Pearls for NEET-PG:** * **Congenital Varicella Syndrome:** Look for the keyword "Cicatricial scarring" and "Hypoplastic limbs." * **Timing:** Risk is highest if maternal infection occurs between **13-20 weeks**. * **Post-exposure Prophylaxis:** If a susceptible pregnant woman is exposed, give **VZIG** (Varicella-Zoster Immunoglobulin) within 10 days. * **Neonatal Varicella:** If the mother develops a rash 5 days before to 2 days after delivery, the neonate is at high risk for severe disseminated disease and must receive VZIG immediately.

Q: The serum of a newborn infant reveals a 1:32 cytomegalovirus (CMV) titer. The child is clinically asymptomatic. Which of the following courses of action would be advisable?

Obtain an anti-CMV IgM titer from the baby. **Explanation:** The core concept here is distinguishing between **maternally derived passive immunity** and an **active neonatal infection**. 1. **Why Option D is correct:** IgG antibodies (which make up the initial 1:32 titer) can cross the placenta from the mother to the fetus. Therefore, a positive IgG titer in a newborn does not confirm congenital infection; it may simply reflect the mother’s past exposure. However, **IgM antibodies do not cross the placenta.** If the baby has a positive anti-CMV IgM titer, it indicates that the infant’s own immune system is producing antibodies in response to an active infection. This is the standard serological method to diagnose congenital CMV in an asymptomatic neonate. 2. **Why the other options are incorrect:** * **Option A:** Repeating the same titer immediately provides no new information, as it will still reflect the same mix of maternal and fetal IgG. * **Option B:** Waiting 6 months is dangerous. While maternal IgG disappears by 6–12 months, congenital CMV requires early identification to monitor for late-onset complications like sensorineural hearing loss (SNHL). * **Option C:** The mother’s IgM status only indicates her recent infection status; it does not confirm whether the virus was transmitted to the fetus. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** The most definitive test for congenital CMV is **PCR or viral culture of urine or saliva** obtained within the first 3 weeks of life. * **Most Common Presentation:** Most neonates (90%) are **asymptomatic** at birth, but 10-15% of these will develop progressive **Sensorineural Hearing Loss (SNHL)**. * **Classic Triad (Symptomatic):** Periventricular calcifications, microcephaly, and chorioretinitis. * **Treatment:** Oral Valganciclovir or IV Ganciclovir is indicated for symptomatic disease to improve hearing and neurodevelopmental outcomes.

Q: Risk of damage to the fetus by maternal rubella infection is maximum if the mother gets infected in which period of pregnancy?

6-12 weeks. **Explanation:** The risk of fetal damage following maternal rubella infection is inversely proportional to the gestational age at the time of infection. This is due to the high rate of organogenesis occurring during the first trimester. **1. Why 6–12 weeks is correct:** During the first trimester (especially the first 12 weeks), the placental barrier is more permeable to the virus, and the developing fetal organs are at their most vulnerable stage. If infection occurs before 11–12 weeks of gestation, the risk of **Congenital Rubella Syndrome (CRS)** is as high as **80–90%**. Defects are often multiple (Gregg’s Triad) and severe. **2. Why the other options are incorrect:** * **20–24 weeks & 24–28 weeks:** By the second trimester, the risk of major structural malformations drops significantly. Between 16–20 weeks, the risk of damage (primarily sensorineural hearing loss) falls to about 10–15%. After 20 weeks, fetal damage is rare. * **32–36 weeks:** In the third trimester, while the rate of placental transmission increases again, the fetus is fully formed. Infection at this stage may lead to intrauterine growth restriction (IUGR) or neonatal infection, but not the classic structural malformations of CRS. **High-Yield Clinical Pearls for NEET-PG:** * **Gregg’s Triad:** Cataracts, Sensorineural deafness (most common), and Cardiac defects (PDA is most common; Peripheral Pulmonary Artery Stenosis is most specific). * **Classic Sign:** "Blueberry muffin" spots (extramedullary hematopoiesis). * **Diagnosis:** Detection of Rubella-specific IgM in the newborn or persistence of IgG beyond 6–12 months. * **Prevention:** Live attenuated **RA 27/3 vaccine**. It is contraindicated during pregnancy; women should avoid conception for 1 month after vaccination.

Q: A neonate presents with bilious vomiting. What is the first investigation to be performed?

Abdomen X-ray. **Explanation:** **Bilious vomiting in a neonate is a surgical emergency** until proven otherwise, as it typically indicates a mechanical intestinal obstruction distal to the Ampulla of Vater. **Why Abdomen X-ray is the Correct Choice:** The initial step in the diagnostic algorithm for neonatal bilious vomiting is a **plain radiograph (Abdomen X-ray)**, usually taken in the supine and erect (or lateral decubitus) positions. It is the most rapid and non-invasive way to categorize the obstruction: * **Double Bubble Sign:** Suggests Duodenal Atresia. * **Multiple Dilated Loops:** Suggests distal obstruction (e.g., Ileal atresia, Meconium ileus). * **Gasless Abdomen:** May suggest Malrotation with Midgut Volvulus or high obstruction. * **Pneumoperitoneum:** Indicates perforation, requiring immediate surgery. **Why Other Options are Incorrect:** * **Baby gram:** This involves imaging the entire body (chest and abdomen) on one film. While common in NICUs, it lacks the specific detail required for surgical abdominal evaluation and increases unnecessary radiation exposure to the chest. * **CT Scan:** Rarely indicated in neonatal bowel obstruction due to high radiation and the superior utility of X-rays and contrast studies. * **Ultrasound (USG):** While useful for identifying the "whirlpool sign" in midgut volvulus or Pyloric Stenosis (which presents with *non-bilious* vomiting), it is operator-dependent and not the primary screening tool for generalized neonatal obstruction. **Clinical Pearls for NEET-PG:** * **Gold Standard for Malrotation/Volvulus:** Upper GI Contrast Study (showing "corkscrew appearance"). * **Most Common Cause of Bilious Vomiting:** Varies by age, but **Malrotation with Midgut Volvulus** is the most dreaded diagnosis to exclude. * **Management Tip:** Always start with "NPO" (Nil Per Oral), NG tube decompression, and IV fluids while awaiting X-ray results.

Q: In neonatal herpes, what is true?

Caused by HSV-II. **Explanation:** Neonatal Herpes Simplex Virus (HSV) infection is a serious condition typically acquired during delivery through an infected birth canal. **1. Why Option A is Correct:** Approximately **70-80% of neonatal herpes cases are caused by HSV-2**. This is because HSV-2 is the primary cause of genital herpes in the mother. While HSV-1 cases are increasing due to changing practices, HSV-2 remains the classic and most common causative agent in the neonatal period. **2. Why the other options are Incorrect:** * **Option B:** While hepatosplenomegaly can occur in the disseminated form of the disease, it is **not diagnostic**. Diagnosis requires PCR of the blood/CSF or viral cultures from skin vesicles, as many other TORCH infections (like CMV or Syphilis) present with similar clinical findings. * **Option C:** Spontaneous recovery does **not** occur. Neonatal herpes is a medical emergency with high morbidity and mortality. Without treatment, the virus rapidly replicates and attacks the central nervous system or visceral organs. * **Option D:** This is a distractor. While the disease *can* disseminate, the question asks for what is "true" as a defining characteristic. Furthermore, even the localized "SEM" (Skin, Eye, Mouth) type requires immediate treatment to *prevent* dissemination; it doesn't mean it *always* disseminates if untreated—it may instead progress directly to encephalitis. **NEET-PG High-Yield Pearls:** * **Classification:** 1. SEM (Skin, Eye, Mouth), 2. CNS disease (Encephalitis), 3. Disseminated disease (highest mortality). * **Drug of Choice:** Intravenous **Acyclovir** (20 mg/kg every 8 hours for 14-21 days). * **Timing of Infection:** Most infections (85%) are **peripartum** (during delivery). * **Prevention:** If active genital lesions are present at the time of labor, a **Cesarean section** is indicated to reduce transmission risk.

Q: Hypoxia induced metabolic acidemia is when?

Umbilical artery blood pH < 7.00. **Explanation:** The diagnosis of **hypoxia-induced metabolic acidemia** (often termed "pathological acidemia") is a critical marker in neonatology used to define birth asphyxia and predict potential neurological sequelae like Hypoxic-Ischemic Encephalopathy (HIE). **1. Why Option A is Correct:** According to the American College of Obstetricians and Gynecologists (ACOG) and the American Academy of Pediatrics (AAP), the threshold for clinically significant metabolic acidemia is an **umbilical artery blood pH 17.7 mmol/L is relatively normal; pathological acidemia typically involves significantly lower levels as bicarbonate is consumed to buffer the excess lactic acid. * **Option C:** The criteria for metabolic acidemia require a **Base Deficit ≥ 12 mmol/L**. A base deficit *less* than 12 mmol/L (e.g., 8 or 10) indicates a milder state that does not meet the formal definition of severe metabolic acidemia. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Umbilical **arterial** blood gas (ABG) is more reflective of fetal status than venous blood. * **The "Rule of 7 & 12":** For a diagnosis of birth asphyxia, you need a pH ** 6 mmol/L) are also used as an early indicator of anaerobic metabolism due to hypoxia. * **Associated Findings:** To label a case as "Birth Asphyxia," the acidemia must be accompanied by an Apgar score of 0–3 for > 5 minutes and evidence of multisystem organ dysfunction.

Q: A 3-day-old preterm neonate presented with breathing difficulty from birth and was admitted to the NICU. A chest X-ray was performed, showing diffuse bilateral opacities. Which of the following disorders is the neonate most likely suffering from?

Respiratory distress syndrome. **Explanation:** The clinical presentation and radiological findings point towards **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease. **1. Why Respiratory Distress Syndrome is correct:** RDS is primarily a disease of **preterm neonates** caused by a deficiency of **surfactant** (produced by Type II pneumocytes). Surfactant reduces alveolar surface tension; its absence leads to widespread alveolar collapse (atelectasis). * **Clinical Presentation:** Respiratory distress (tachypnea, grunting, retractions) starting almost immediately after birth. * **Radiology:** The classic X-ray finding is **diffuse, bilateral, symmetrical opacities** with a "ground-glass" appearance and **air bronchograms**. In severe cases, "white-out" lungs may be seen. **2. Why other options are incorrect:** * **Neonatal Pneumonia:** While it can cause diffuse opacities, it is usually associated with a history of prolonged rupture of membranes or maternal fever. Radiologically, it often presents with patchy, asymmetrical infiltrates rather than uniform ground-glass opacities. * **Transient Tachypnea of the Newborn (TTN):** This typically affects **term or late-preterm** infants (often post-LSCS). It is caused by delayed clearance of fetal lung fluid. X-ray shows prominent vascular markings, fluid in the fissures, and hyperinflation, not diffuse opacities. **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Prematurity (most common), maternal diabetes, and cesarean section without labor. * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **<2:1** in amniotic fluid indicates lung immaturity. * **Management:** Antenatal steroids (Dexamethasone/Betamethasone) to the mother; Surfactant replacement therapy and CPAP for the neonate. * **Complications:** Bronchopulmonary dysplasia (BPD), Retinopathy of Prematurity (ROP), and Intraventricular hemorrhage (IVH).

Q: Which of the following is a known complication of Cytomegalovirus (CMV) infection in neonates?

Intrauterine Growth Restriction (IUGR). **Explanation:** Congenital Cytomegalovirus (CMV) is the most common intrauterine infection worldwide. It primarily affects the vascular endothelium and organ parenchyma, leading to significant systemic manifestations. **1. Why Option A is Correct:** **Intrauterine Growth Restriction (IUGR)** is a hallmark of congenital CMV. The virus infects the placenta (villitis), leading to placental insufficiency. Furthermore, direct viral replication in fetal tissues causes cell death and inhibits mitosis, resulting in a baby that is "Small for Gestational Age" (SGA) with associated **microcephaly**. **2. Why the Other Options are Incorrect:** * **B. Sepsis:** While CMV is a systemic infection, "Sepsis" typically refers to acute bacterial infections (like GBS or E. coli) presenting with hemodynamic instability. CMV presents as a chronic, multisystemic "TORCH" syndrome. * **C. Hydrocephalus:** This is classically associated with **Congenital Toxoplasmosis**. CMV, conversely, causes brain destruction and atrophy, leading to **ventriculomegaly** (secondary to loss of brain parenchyma) and **microcephaly**, rather than obstructive hydrocephalus. * **D. Thrombocytosis:** CMV typically causes **Thrombocytopenia** (low platelet count), which manifests clinically as a "Blueberry muffin rash" (extramedullary hematopoiesis) and petechiae. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Microcephaly, Periventricular calcifications, and Sensorineural Hearing Loss (SNHL). * **SNHL:** CMV is the most common non-genetic cause of SNHL in children. * **Imaging:** CT/USG Head shows **periventricular calcifications** (vs. diffuse parenchymal calcifications in Toxoplasmosis). * **Diagnosis:** Gold standard is **Viral culture or PCR of saliva/urine** within the first 3 weeks of life. * **Treatment:** Intravenous Ganciclovir or oral Valganciclovir.

Q: Which of the following babies has the least risk of developing hypoglycemia?

Appropriate for gestational age babies. **Explanation:** Neonatal hypoglycemia is defined as a plasma glucose level of **<40 mg/dL** in the first 24 hours of life and **<50 mg/dL** thereafter. The risk of hypoglycemia depends on the balance between glucose stores (glycogen), metabolic demand, and hormonal regulation. **Why Option C is Correct:** **Appropriate for Gestational Age (AGA)** babies have normal glycogen stores in the liver and skeletal muscle, a balanced insulin-to-glucagon ratio, and an average metabolic rate. Since they have neither the excessive demand nor the depleted stores seen in high-risk categories, they have the **least risk** of hypoglycemia. **Analysis of Incorrect Options:** * **Infant of Diabetic Mother (IDM):** Maternal hyperglycemia leads to fetal hyperglycemia, which causes **fetal hyperinsulinism**. After birth, the glucose supply is cut off, but high insulin levels persist, causing rapid glucose uptake and profound hypoglycemia. * **Intrauterine Growth Restriction (IUGR):** These babies have **depleted glycogen and fat stores** due to placental insufficiency. They also have a relatively larger brain-to-body mass ratio, leading to increased glucose consumption. * **Maternal Beta-Blockers:** Drugs like Propranolol or Labetalol cross the placenta and can cause neonatal hypoglycemia by **inhibiting glycogenolysis** and masking the sympathetic warning signs of low blood sugar. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of neonatal hypoglycemia: Transient hyperinsulinism (IDM). * **Beckwith-Wiedemann Syndrome:** A classic high-yield association featuring macrosomia, omphalocele, macroglossia, and hyperinsulinemic hypoglycemia. * **Treatment:** Asymptomatic cases are managed with early breastfeeding; symptomatic cases require an **IV bolus of 2 ml/kg of 10% Dextrose (D10W)** followed by a continuous glucose infusion rate (GIR) of 6–8 mg/kg/min.

Q: Alcohol intake during pregnancy causes all of the following fetal effects, except?

Brachycephaly. **Explanation:** Alcohol is a potent teratogen that crosses the placenta, leading to a spectrum of disorders known as **Fetal Alcohol Spectrum Disorder (FASD)**. **1. Why Brachycephaly is the correct answer:** Alcohol intake during pregnancy typically results in **Dolichocephaly** (a long, narrow head) rather than Brachycephaly (a broad, short head). The characteristic craniofacial features of Fetal Alcohol Syndrome (FAS) include a thin upper lip, smooth philtrum, and short palpebral fissures. **2. Analysis of incorrect options:** * **Microcephaly:** Alcohol is neurotoxic and interferes with glial cell proliferation and migration. This leads to reduced brain volume and a characteristically small head circumference (Microcephaly). * **Hyperkinetic movements:** Prenatal alcohol exposure affects the development of the central nervous system, often manifesting postnatally as irritability, hyperactivity, attention deficit disorders (ADHD), and poor impulse control. * **Congenital anomalies:** Alcohol is associated with various structural defects, most notably **Septal heart defects** (VSD/ASD), limb abnormalities, and renal anomalies. **High-Yield Clinical Pearls for NEET-PG:** * **Safe Limit:** There is no known safe amount of alcohol during pregnancy. * **Classic Triad of FAS:** 1. Pre- and post-natal growth restriction. 2. CNS involvement (Microcephaly, intellectual disability). 3. Facial dysmorphism (Smooth philtrum, thin vermilion border, short palpebral fissures). * **Most sensitive period:** The first trimester is the most critical period for structural anomalies, while the third trimester is critical for brain growth and functional development.

Question 1

Hypoplasia of limb and scarring is caused by which of the following infections?

Accepted Answer

Varicella

Answer

Herpes simplex

Answer

Rubella

Answer

Toxoplasma

Question 2

The serum of a newborn infant reveals a 1:32 cytomegalovirus (CMV) titer. The child is clinically asymptomatic. Which of the following courses of action would be advisable?

Accepted Answer

Obtain an anti-CMV IgM titer from the baby

Answer

Repeat the CMV titer immediately

Answer

Wait 6 months and obtain another titer on the baby

Answer

Obtain an anti-CMV IgM titer from the mother

Question 3

Risk of damage to the fetus by maternal rubella infection is maximum if the mother gets infected in which period of pregnancy?

Accepted Answer

6-12 weeks

Answer

20-24 weeks

Answer

24-28 weeks

Answer

32-36 weeks

Question 4

A neonate presents with bilious vomiting. What is the first investigation to be performed?

Accepted Answer

Abdomen X-ray

Answer

Baby gram

Answer

CT scan

Answer

Ultrasound (USG)

Question 5

In neonatal herpes, what is true?

Accepted Answer

Caused by HSV-II

Answer

Hepatosplenomegaly is diagnostic

Answer

Spontaneous recovery occurs

Answer

If not treated, it disseminates

Question 6

Hypoxia induced metabolic acidemia is when?

Accepted Answer

Umbilical artery blood pH < 7.00

Answer

HCO3 - concentration > 17.7 mmol/L

Answer

Base deficit < 12 mmol/L

Answer

None of the above

Question 7

A 3-day-old preterm neonate presented with breathing difficulty from birth and was admitted to the NICU. A chest X-ray was performed, showing diffuse bilateral opacities. Which of the following disorders is the neonate most likely suffering from?

Accepted Answer

Respiratory distress syndrome

Answer

Neonatal pneumonia

Answer

Transient tachypnea of the newborn

Answer

None of these

Question 8

Which of the following is a known complication of Cytomegalovirus (CMV) infection in neonates?

Accepted Answer

Intrauterine Growth Restriction (IUGR)

Answer

Sepsis

Answer

Hydrocephalus

Answer

Thrombocytosis

Question 9

Which of the following babies has the least risk of developing hypoglycemia?

Accepted Answer

Appropriate for gestational age babies

Answer

A baby born to a mother treated with beta-blockers

Answer

Infant of a diabetic mother

Answer

Intrauterine growth restriction (IUGR) babies

Question 10

Alcohol intake during pregnancy causes all of the following fetal effects, except?

Accepted Answer

Brachycephaly

Answer

Microcephaly

Answer

Hyperkinetic movements

Answer

Congenital anomalies

Neonatology — MCQs

Neonatology — MCQs

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