Neonatology Practice Questions

Q: All of the following are congenital infections EXCEPT:

Gonorrhea. The core concept in this question is the distinction between **congenital (transplacental)** infections and **perinatal (birth canal)** infections. ### **Why Gonorrhea is the Correct Answer** **Gonorrhea** (caused by *Neisseria gonorrhoeae*) is not a congenital infection because it does not cross the placenta to infect the fetus in utero. Instead, it is a **perinatal infection** acquired during delivery as the neonate passes through an infected birth canal. It typically manifests as **Ophthalmia Neonatorum** (purulent conjunctivitis) within 2–5 days of birth. ### **Why the Other Options are Incorrect** Options A, B, and C are classic components of the **TORCH complex**, which are infections transmitted **transplacentally** from mother to fetus: * **Rubella:** Causes Congenital Rubella Syndrome (CRS), characterized by the triad of cataracts, sensorineural deafness, and congenital heart disease (PDA). * **Cytomegalovirus (CMV):** The most common congenital infection. It typically presents with periventricular calcifications, microcephaly, and sensorineural hearing loss. * **Toxoplasmosis:** Caused by *Toxoplasma gondii*, it presents with the classic triad of chorioretinitis, hydrocephalus, and intracranial (diffuse) calcifications. ### **NEET-PG High-Yield Pearls** * **TORCH acronym:** **T**oxoplasmosis, **O**thers (Syphilis, HIV, HBV, VZV, Parvovirus B19), **R**ubella, **C**MV, and **H**erpes Simplex (HSV-2). * **Calcification Tip:** CMV = **P**eriventricular calcifications; Toxoplasmosis = **D**iffuse/Scattered calcifications. * **Ophthalmia Neonatorum Timing:** Chemical (24 hrs) < Gonococcal (2–5 days) < Chlamydial (5–14 days). * **Treatment:** Ceftriaxone is the drug of choice for neonatal gonococcal conjunctivitis.

Q: A mother has been infected with rubella during pregnancy. Which of the following fetal congenital malformations can occur?

Pulmonary Stenosis (PS). **Explanation:** Congenital Rubella Syndrome (CRS) is a classic TORCH infection that occurs due to transplacental transmission of the Rubella virus, primarily during the first trimester. The virus causes vasculitis and inhibits mitosis, leading to multi-organ defects. **Why Pulmonary Stenosis (PS) is the correct answer:** While **Patent Ductus Arteriosus (PDA)** is the most common cardiac lesion overall in CRS, **Peripheral Pulmonary Artery Stenosis (PPS)** is the most characteristic and specific structural malformation associated with the syndrome. In many standardized exams, if both are present, PS (specifically peripheral) is frequently tested as the hallmark lesion. The virus directly damages the vascular endothelium of the pulmonary arteries during organogenesis. **Analysis of Incorrect Options:** * **A & B (VSD and ASD):** While these are common congenital heart defects in the general population, they are not classically associated with Congenital Rubella Syndrome. * **D (Patent Ductus Arteriosus):** Although PDA is the **most frequent** cardiac defect in CRS, it is often considered a "functional" failure of closure. In the context of this specific question format, Pulmonary Stenosis is often prioritized as the definitive structural malformation. **NEET-PG High-Yield Pearls:** * **Gregg’s Triad:** The classic presentation of CRS includes **Cataracts** (salt and pepper retinopathy), **Sensorineural Hearing Loss** (most common finding), and **Cardiac defects** (PDA/PS). * **"Blueberry Muffin" Rash:** Represents extramedullary hematopoiesis. * **Timing:** Risk is highest (up to 80%) if maternal infection occurs within the first 12 weeks of gestation. * **Diagnosis:** Confirmed by Rubella-specific IgM in the newborn or persistent IgG titers beyond 6 months.

Q: Vomiting on the first day of a baby's life can be caused by all of the following except?

Pyloric stenosis. **Explanation:** The correct answer is **A. Pyloric Stenosis**. **1. Why Pyloric Stenosis is the correct answer:** Infantile Hypertrophic Pyloric Stenosis (IHPS) typically presents between **3 to 6 weeks** of life. It is extremely rare for it to cause vomiting on the first day of life because the hypertrophy of the pyloric muscle takes time to develop and cause a complete gastric outlet obstruction. The classic presentation is non-bilious, projectile vomiting in a "hungry feeder." **2. Analysis of Incorrect Options:** * **Oesophageal Atresia:** This presents immediately after birth with excessive salivation, drooling, and choking or vomiting during the very first feed. * **Aerophagy:** Air swallowing during feeding is a common cause of "spitting up" or mild vomiting in the early neonatal period. * **Amniotic Gastritis:** This occurs when the fetus swallows blood-stained or infected amniotic fluid during labor. The gastric irritation leads to vomiting within the first 24 hours of life. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pyloric Stenosis:** Look for the "Olive-shaped mass" on palpation and the "String sign" on barium swallow. The metabolic abnormality is **Hypochloremic, Hypokalemic Metabolic Alkalosis**. * **Bilious Vomiting on Day 1:** Always suspect distal obstructions like Duodenal Atresia (associated with Down Syndrome and the "Double Bubble" sign) or Malrotation with Volvulus. * **Tracheoesophageal Fistula (TEF):** The most common type is Type C (Esophageal atresia with distal TEF). Diagnosis is confirmed by the inability to pass a firm nasogastric tube into the stomach.

Q: Infants of diabetic pregnancies may have hypertrophic cardiomyopathy that occasionally progresses to congestive heart failure. Cardiomyopathy generally disappears by what age?

6 months of age. **Explanation:** **Hypertrophic Cardiomyopathy (HCM)** in infants of diabetic mothers (IDM) is primarily driven by fetal hyperinsulinemia. Insulin acts as an anabolic hormone that triggers the deposition of glycogen and fat into the myocardial cells, leading to disproportionate thickening of the interventricular septum. This can cause subaortic outflow tract obstruction and, in severe cases, congestive heart failure. **1. Why 6 months is correct:** The underlying pathophysiology is transient because the stimulus (maternal hyperglycemia and subsequent fetal hyperinsulinemia) is removed at birth. Once the infant is no longer exposed to high glucose levels, the excess myocardial glycogen is gradually metabolized. Clinical and echocardiographic resolution of the septal hypertrophy typically occurs within **6 months of age**. **2. Why other options are incorrect:** * **1 month & 3 months:** While symptoms may improve as the infant stabilizes, complete anatomical resolution of the thickened myocardium usually takes longer than the first trimester of life. * **12 months:** Most cases resolve well before the end of the first year. If cardiomyopathy persists beyond 6–9 months, clinicians should investigate other genetic or metabolic etiologies (e.g., Pompe disease or familial HCM). **Clinical Pearls for NEET-PG:** * **Management:** Unlike adult HCM, the primary treatment for symptomatic IDM with HCM is **Beta-blockers** (e.g., Propranolol) to slow the heart rate and improve diastolic filling. * **Contraindication:** **Digoxin and Inotropes** are generally contraindicated as they increase contractility, which can worsen the outflow tract obstruction. * **Incidence:** Asymmetric septal hypertrophy occurs in approximately 30% of IDMs, though only a small fraction (5-10%) develop clinical heart failure.

Q: What is the definition of a preterm infant?

Born before 37 weeks gestation. ### Explanation **Correct Answer: C. Born before 37 weeks gestation** The classification of neonates is based on the **Gestational Age (GA)**, calculated from the first day of the mother's Last Menstrual Period (LMP). According to the World Health Organization (WHO), a **preterm infant** is defined as any baby born alive before **37 completed weeks** of pregnancy (less than 259 days). This threshold is clinically significant because infants born before this period have immature organ systems, particularly the lungs (surfactant deficiency) and the brain, increasing the risk of morbidity and mortality. **Analysis of Incorrect Options:** * **Option A (37-42 weeks):** This defines a **Term infant**. These infants have the lowest risk of complications. (Note: "Early term" is 37 0/7 to 38 6/7 weeks). * **Option B (After 42 weeks):** This defines a **Post-term infant**. These babies are at risk for meconium aspiration syndrome and placental insufficiency. * **Option D (Before 25 weeks):** While these are preterm, this specific cutoff often refers to "extreme prematurity" or the "limit of viability" in many clinical settings, but it is not the standard definition for preterm birth. **High-Yield Clinical Pearls for NEET-PG:** * **Sub-categories of Preterm:** * *Late preterm:* 34 to <37 weeks. * *Very preterm:* <32 weeks. * *Extremely preterm:* <28 weeks. * **New Ballard Score:** The most commonly used clinical tool to estimate gestational age postnatally based on physical and neuromuscular maturity. * **Common Complications:** Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), Necrotizing Enterocolitis (NEC), and Retinopathy of Prematurity (ROP).

Q: A 2-day-old neonate developed respiratory distress due to pneumonia. What is the most common causative agent?

Group-B Streptococci. **Explanation:** The neonate in the question is 2 days old, placing the condition in the category of **Early-Onset Neonatal Sepsis/Pneumonia** (occurring within the first 72 hours of life). **1. Why Group-B Streptococci (GBS) is correct:** *Streptococcus agalactiae* (GBS) is the most common cause of early-onset neonatal pneumonia, sepsis, and meningitis worldwide. The infection is typically acquired via **vertical transmission** from the maternal genital tract during labor or through ascending infection. In the lungs, GBS causes an inflammatory response that often mimics Hyaline Membrane Disease (HMD) on X-ray, presenting with respiratory distress shortly after birth. **2. Why the other options are incorrect:** * **A. Haemophilus influenzae:** While it can cause respiratory infections, it is a rare cause of neonatal pneumonia in the immediate postnatal period. * **C. Staphylococci:** *Staphylococcus aureus* is a common cause of **Late-Onset** pneumonia (after 72 hours), often associated with skin infections or hospital-acquired (nosocomial) settings. * **D. Pseudomonas:** This is typically a **nosocomial (NICU-acquired)** pathogen. It is seen in neonates on prolonged mechanical ventilation or those with long hospital stays, rather than as a primary cause on day 2. **Clinical Pearls for NEET-PG:** * **Most common cause of Early-Onset Sepsis (EOS):** Group-B Streptococci (followed by *E. coli*). * **Most common cause of Late-Onset Sepsis (LOS):** Coagulase-negative Staphylococci (CONS). * **Drug of Choice for GBS:** Penicillin G or Ampicillin. * **Radiological Mimic:** GBS pneumonia can be indistinguishable from Respiratory Distress Syndrome (RDS) on a chest X-ray (both show diffuse reticulogranular patterns).

Q: Which of the following is not a normal finding in a newborn?

Pulse rate of 100/min. ### Explanation In neonatology, distinguishing between physiological transitions and pathological signs is crucial for the NEET-PG exam. **1. Why "Pulse rate of 100/min" is the correct answer:** The normal resting heart rate for a newborn ranges from **120 to 160 beats per minute (bpm)**. While the heart rate may drop to 80–90 bpm during deep sleep, a persistent pulse rate of 100/min in an awake newborn is considered **neonatal bradycardia**. In the context of neonatal resuscitation, a heart rate below 100/min is a critical threshold indicating the need for positive pressure ventilation (PPV). **2. Why the other options are considered normal:** * **Systolic Murmur:** Transient systolic murmurs are common in the first 24–48 hours of life. These are usually "innocent" and result from the physiological closing of the **Ductus Arteriosus** or peripheral pulmonary artery stenosis as the newborn adapts to extrauterine circulation. * **Peripheral Cyanosis (Acrocyanosis):** This refers to the bluish discoloration of the hands and feet. It is a normal finding in the first 24–48 hours due to benign peripheral vasoconstriction and sluggish capillary flow. It must be distinguished from **Central Cyanosis** (tongue and lips), which is always pathological. **Clinical Pearls for NEET-PG:** * **Respiratory Rate:** Normal is 40–60 breaths/min. Periodic breathing (pauses 20 seconds) is pathological. * **Apgar Score:** Heart rate is the most important prognostic component. * **Bradycardia:** The most common cause of bradycardia in a newborn is **hypoxia**, not primary cardiac disease. * **Blood Pressure:** Usually 60–90/20–60 mmHg at birth.

Q: A newborn baby presents with regurgitation of feeds and continuous drooling of saliva. What is the most likely diagnosis?

Esophageal atresia. ### Explanation **Correct Answer: A. Esophageal Atresia** **Why it is correct:** The clinical hallmark of **Esophageal Atresia (EA)** is the inability of the newborn to swallow saliva or feeds due to a blind-ending proximal esophageal pouch. This leads to the classic triad of: 1. **Excessive frothy salivation (drooling):** Saliva cannot pass into the stomach and spills out of the mouth. 2. **Regurgitation:** Immediate return of feeds. 3. **Choking/Cyanosis:** Often occurs during the first feeding attempt (especially if a Tracheoesophageal Fistula is present). The diagnosis is confirmed by the inability to pass a firm, large-bore orogastric tube into the stomach (it typically coils in the upper pouch). **Why the other options are incorrect:** * **B. GERD:** While common in neonates, it typically presents with effortless vomiting after feeds rather than continuous drooling of saliva from birth. * **C. Diffuse Esophageal Spasm:** This is a motility disorder primarily seen in adults, presenting with intermittent chest pain and dysphagia, not neonatal drooling. * **D. Zenker’s Diverticulum:** This is an acquired pulsion diverticulum through Killian’s dehiscence, almost exclusively seen in elderly patients. It is not a congenital neonatal condition. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** Type C (Vogt-Cameron classification) – Esophageal atresia with a **distal** Tracheoesophageal Fistula (85% of cases). * **Radiology:** Presence of **air in the stomach/bowel** on X-ray indicates a distal fistula. A "gasless abdomen" suggests pure atresia without a distal fistula. * **Associated Anomalies:** 50% of cases are associated with **VACTERL** syndrome (Vertebral, Anal, Cardiac, TEF, Renal, Limb anomalies). * **Antenatal Clue:** Maternal **polyhydramnios** (fetus cannot swallow amniotic fluid).

Question 1

All of the following are congenital infections EXCEPT:

Accepted Answer

Gonorrhea

Answer

Rubella

Answer

Cytomegalovirus (CMV)

Answer

Toxoplasmosis

Question 2

A mother has been infected with rubella during pregnancy. Which of the following fetal congenital malformations can occur?

Accepted Answer

Pulmonary Stenosis (PS)

Answer

Ventricular Septal Defect (VSD)

Answer

Atrial Septal Defect (ASD)

Answer

Patent Ductus Arteriosus (PDA)

Question 3

Vomiting on the first day of a baby's life can be caused by all of the following except?

Accepted Answer

Pyloric stenosis

Answer

Oesophageal atresia

Answer

Aerophagy

Answer

Amniotic gastritis

Question 4

Late onset hemorrhagic disease of the newborn is characterized by all of the following features except?

Accepted Answer

Usually occurs in exclusively breastfed babies

Answer

Onset occurs at 4-12 weeks of age

Answer

Intracranial hemorrhage can occur

Answer

Intramuscular vitamin K prophylaxis at birth has a protective role

Question 5

A patient was induced for being post-term at 42 3/7 weeks. Immediately following the delivery, you examine the baby and note the following on physical exam: a small amount of cartilage in the earlobe, occasional creases over the anterior two-thirds of the soles of the feet, 4-mm breast nodule diameter, fine and fuzzy scalp hair, and a scrotum with some but not extensive rugae. Based on this physical exam, what is the approximate gestational age of this male infant?

Accepted Answer

38 weeks

Answer

33 weeks

Answer

36 weeks

Answer

42 weeks

Question 6

Infants of diabetic pregnancies may have hypertrophic cardiomyopathy that occasionally progresses to congestive heart failure. Cardiomyopathy generally disappears by what age?

Accepted Answer

6 months of age

Answer

1 month of age

Answer

3 months of age

Answer

12 months of age

Question 7

What is the definition of a preterm infant?

Accepted Answer

Born before 37 weeks gestation

Answer

Born between 37-42 weeks gestation

Answer

Born after 42 weeks gestation

Answer

Born before 25 weeks gestation

Question 8

A 2-day-old neonate developed respiratory distress due to pneumonia. What is the most common causative agent?

Accepted Answer

Group-B Streptococci

Answer

Haemophilus influenzae

Answer

Staphylococci

Answer

Pseudomonas

Question 9

Which of the following is not a normal finding in a newborn?

Accepted Answer

Pulse rate of 100/min

Answer

Systolic murmur

Answer

Peripheral cyanosis

Answer

All

Question 10

A newborn baby presents with regurgitation of feeds and continuous drooling of saliva. What is the most likely diagnosis?

Accepted Answer

Esophageal atresia

Answer

Gastroesophageal reflux disease (GERD)

Answer

Diffuse esophageal spasm

Answer

Zenker's diverticulum

Neonatology — MCQs

Neonatology — MCQs

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