Neonatology Practice Questions

Q: What is the drug of choice for neonatal seizures?

Phenobarbitone. **Explanation:** **Phenobarbitone** is the first-line drug of choice for neonatal seizures. The primary reason is its superior efficacy and safety profile in neonates compared to other anticonvulsants. It acts by enhancing GABA-mediated inhibition in the brain. In neonates, the pharmacokinetics of phenobarbitone are well-studied; it has a long half-life and provides stable plasma levels, which is crucial for controlling the immature neonatal brain's tendency toward repetitive electrical discharges. **Why other options are incorrect:** * **Phenytoin (Option A):** Usually considered the second-line agent if phenobarbitone fails. It is difficult to maintain therapeutic levels in neonates due to erratic absorption and saturation kinetics. * **Diazepam (Option C):** Not used as a first-line maintenance therapy because it has a short duration of action in the brain and carries a high risk of respiratory depression and hypotension, especially when used alongside phenobarbitone. It can also displace bilirubin from albumin, increasing the risk of kernicterus. * **Sodium Valproate (Option D):** Generally avoided in neonates due to the high risk of fatal hepatotoxicity (Valproate-induced liver failure) in children under two years of age and its association with metabolic interference. **High-Yield Clinical Pearls for NEET-PG:** * **Loading Dose:** Phenobarbitone is typically started at **20 mg/kg** IV. * **Refractory Seizures:** If seizures persist, Levetiracetam is increasingly used, but Phenobarbitone remains the gold standard in current guidelines (WHO/NRP). * **Most common cause:** Hypoxic-Ischemic Encephalopathy (HIE) is the most common cause of neonatal seizures. * **Drug of choice for Hypocalcemic seizures:** Calcium gluconate (10%). * **Drug of choice for Pyridoxine-dependent seizures:** Intravenous Pyridoxine (Vitamin B6).

Q: Edema of hands and feet in infants is characterized by which of the following conditions?

Turner syndrome. **Explanation:** **Turner Syndrome (45, XO)** is the correct answer. The hallmark finding of edema of the hands and feet in a newborn female is **congenital lymphedema**. This occurs due to the hypoplasia or malformation of the lymphatic vessels during embryogenesis. While this edema often resolves as the child grows, it is a classic diagnostic clue in the neonatal period, often accompanied by a "webbed neck" (cystic hygroma remnant). **Analysis of Incorrect Options:** * **Klinefelter Syndrome (47, XXY):** This condition typically presents post-puberty with primary hypogonadism, tall stature, and gynecomastia. It does not manifest with neonatal lymphedema. * **Noonan Syndrome:** Often called "Male Turner Syndrome" due to phenotypic similarities (short stature, webbed neck, pulmonary stenosis), it is an autosomal dominant disorder. While it can occasionally present with lymphedema, it is much more characteristic and classically associated with Turner Syndrome in medical examinations. * **Fragile X Syndrome:** This is the most common cause of inherited intellectual disability. Clinical features include macroorchidism (post-pubertal), a long face, and large prominent ears, but not neonatal peripheral edema. **High-Yield Clinical Pearls for NEET-PG:** * **Cardiac Association:** The most common cardiac defect in Turner Syndrome is **Bicuspid Aortic Valve**, followed by **Coarctation of the Aorta**. * **Renal Association:** **Horseshoe kidney** is frequently seen. * **Stature:** Short stature is the most consistent clinical finding (due to SHOX gene deficiency). * **Gonads:** "Streak ovaries" leading to primary amenorrhea and elevated FSH levels.

Q: A 20-day-old infant presents with fever and irritability. Fontanelles are bulging and neck stiffness is present. Which of the following is the commonest cause of meningitis in the postneonatal period?

Listeria monocytogenes. **Explanation:** The correct answer is **Listeria monocytogenes**. **1. Why Listeria monocytogenes is correct:** The neonatal period is defined as the first 28 days of life. In this age group (0–28 days), the most common causative organisms for bacterial meningitis are **Group B Streptococcus (GBS)**, **Escherichia coli**, and **Listeria monocytogenes**. Since the infant in the question is 20 days old, they fall within the neonatal/early postneonatal window where these pathogens predominate. Listeria is a classic cause of late-onset neonatal sepsis and meningitis, often transmitted via the maternal GI tract or environmental exposure. **2. Why the other options are incorrect:** * **Streptococcus pneumoniae:** This is the most common cause of bacterial meningitis in children **older than 3 months** and adults. While it can occur in neonates, it is not the primary pathogen for this age group. * **Staphylococcus aureus:** This is usually associated with post-neurosurgical procedures, head trauma, or infected shunts, rather than community-acquired neonatal meningitis. * **Mycobacterium tuberculosis:** While a significant cause of meningitis in endemic areas like India, it typically presents with a more subacute or chronic course and is rare in the first month of life. **3. NEET-PG High-Yield Pearls:** * **0–3 Months:** GBS (most common), *E. coli*, *Listeria*. * **3 Months–5 Years:** *Streptococcus pneumoniae*, *Neisseria meningitidis*, *Haemophilus influenzae* type b (Hib - incidence decreased due to vaccination). * **Empiric Treatment (Neonates):** Ampicillin (to cover *Listeria*) + Cefotaxime or an Aminoglycoside. **Avoid Ceftriaxone** in neonates due to the risk of biliary sludging and displacement of bilirubin (kernicterus). * **Bulging Fontanelle:** A key clinical sign of increased intracranial pressure/meningitis in infants, as neck stiffness (Brudzinski/Kernig signs) is often absent in the very young.

Q: A 3-month-old boy is brought to the physician because his parents cannot find one of his testicles. Physical examination confirms the parents' observation. Which of the following is the most likely diagnosis?

Cryptorchidism. **Explanation:** **Cryptorchidism** (undescended testis) is the most common congenital abnormality of the male endocrine/reproductive tract. It refers to the failure of one or both testes to descend into the scrotum. In a 3-month-old infant with a non-palpable or missing testis on examination, this is the most probable diagnosis. While many testes descend spontaneously by 3–4 months of age, the condition is considered pathological if they remain undescended beyond 6 months. **Analysis of Incorrect Options:** * **Anorchia:** This refers to the complete absence of one or both testes (vanishing testis syndrome). It is much rarer than cryptorchidism and is usually a diagnosis of exclusion confirmed via surgical exploration or imaging. * **Klinefelter Syndrome (47, XXY):** This typically presents post-puberty with small, firm testes, gynecomastia, and infertility. It does not typically present as a "missing" testis in infancy. * **Macroorchidism:** This refers to abnormally large testes, commonly associated with Fragile X Syndrome. It is the opposite of the clinical finding described. **NEET-PG High-Yield Pearls:** * **Most common site:** The inguinal canal is the most frequent location for an undescended testis. * **Management:** The gold standard treatment is **Orchidopexy**, ideally performed between **6 to 12 months** of age to preserve fertility and allow for early detection of malignancy. * **Complications:** Increased risk of **Infertility** (due to higher core body temperature) and **Testicular Germ Cell Tumors** (Seminoma is the most common). Note: Orchidopexy reduces the risk of infertility but does not completely eliminate the increased risk of malignancy; it primarily makes the testis accessible for screening. * **Retractile Testis:** A common differential where the testis can be manipulated into the scrotum and stays there (due to an overactive cremasteric reflex); this does not require surgery.

Q: Which of the following is associated with cystic hygroma?

Turner's syndrome. **Explanation:** **Cystic hygroma** (also known as macrocystic lymphatic malformation) is a congenital malformation of the lymphatic system. It occurs due to the failure of the lymphatic vessels to communicate with the venous system, leading to the accumulation of lymph and the formation of large, fluid-filled sacs, most commonly in the posterior triangle of the neck. **Why Turner’s Syndrome is correct:** Turner’s syndrome (45, XO) is the chromosomal anomaly most frequently associated with cystic hygroma. In these fetuses, the lymphatic obstruction leads to the characteristic "webbed neck" (pterygium colli) seen postnatally as the hygroma resolves. It is often detected on prenatal ultrasound as increased nuchal translucency or a large septated cystic mass in the neck. **Why other options are incorrect:** * **Down’s Syndrome (Trisomy 21):** While Down’s syndrome is associated with increased nuchal translucency and occasionally cystic hygroma, the association is significantly stronger and more classic for Turner’s syndrome in the context of lymphatic malformations. * **Marfan’s Syndrome:** This is a connective tissue disorder (FBN1 mutation) characterized by arachnodactyly, ectopia lentis, and aortic root dilation. It is not associated with lymphatic malformations. * **Cushing’s Syndrome:** This results from chronic glucocorticoid excess. Clinical features include moon facies, buffalo hump, and striae, but it has no developmental link to cystic hygroma. **High-Yield Clinical Pearls for NEET-PG:** * **Transillumination:** Cystic hygromas are brilliantly transilluminant (unlike hemangiomas). * **Noonan Syndrome:** This is another important differential; it presents with features similar to Turner’s (webbed neck, short stature) but occurs in both males and females (46, XY or 46, XX). * **Hydrops Fetalis:** Large cystic hygromas in utero can lead to generalized edema and fetal hydrops, which carries a poor prognosis.

Q: Caput succedaneum is said to occur in relation to which event?

During childbirth. **Explanation:** **Caput succedaneum** is a common neonatal scalp condition characterized by diffuse, edematous swelling of the soft tissues. **1. Why Option A is correct:** The condition occurs **during childbirth** due to the mechanical pressure exerted by the cervix on the presenting part of the fetal head. This pressure obstructs venous and lymphatic drainage, leading to localized edema and serosanguinous fluid accumulation in the subcutaneous tissue (above the periosteum). It is present at the time of delivery. **2. Why the other options are incorrect:** * **Options B & C:** These timeframes are more characteristic of **Cephalhematoma**, which typically appears several hours to 2–3 days after birth as subperiosteal bleeding takes time to accumulate. * **Option D:** This is the timeframe for the *resolution* of certain birth injuries, but not their onset. Caput succedaneum usually resolves within 48–72 hours. **High-Yield Clinical Pearls for NEET-PG:** * **Crosses Sutures:** Since the fluid is in the subcutaneous layer (above the periosteum), Caput succedaneum **crosses the suture lines**. (Contrast: Cephalhematoma does *not* cross sutures). * **Molding:** It is frequently associated with molding of the skull bones. * **Vacuum Extraction:** A specialized form called "Chignon" occurs following vacuum-assisted delivery. * **Management:** No treatment is required; it resolves spontaneously without complications. * **Differential Diagnosis:** Always differentiate from **Subgaleal Hemorrhage**, which is a life-threatening emergency where blood accumulates between the aponeurosis and periosteum.

Q: Children born to mothers with Systemic Lupus Erythematosus (SLE) are likely to have which of the following anomalies?

Complete heart block. **Explanation:** The correct answer is **Complete Heart Block**. This occurs as a manifestation of **Neonatal Lupus Erythematosus (NLE)**, a condition caused by the transplacental passage of maternal IgG autoantibodies, specifically **anti-Ro (SS-A)** and **anti-La (SS-B)**. **Why it is correct:** In a mother with SLE (or other connective tissue diseases), these antibodies cross the placenta and target the fetal cardiac conduction system. They cause inflammation and subsequent fibrosis of the **Atrioventricular (AV) node**. Unlike the skin rashes of NLE, which resolve as maternal antibodies wane, the **congenital complete heart block is permanent** and irreversible. It is often detected in utero as persistent fetal bradycardia. **Why the other options are incorrect:** * **A, B, and C (ASD, TOF, TGA):** These are structural congenital heart diseases (CHD). While the incidence of structural CHD is slightly higher in infants of diabetic mothers or those with specific chromosomal anomalies, they are not classically associated with maternal SLE or anti-Ro/La antibodies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cardiac manifestation of NLE:** Complete Heart Block (3rd-degree AV block). * **Most common non-cardiac manifestation:** Erythematous, annular skin rash (often in a "sun-exposed" or periorbital distribution). * **Antibody markers:** Anti-Ro (SS-A) is the most frequently implicated antibody. * **Management:** If detected early in utero, maternal steroids (Dexamethasone) may be used; postnatally, most infants with complete heart block require a **permanent pacemaker**.

Q: A neonate presents with a distended abdomen and failure to pass meconium. Which of the following conditions can be ruled out?

Meckel's diverticulum. **Explanation:** The clinical presentation of abdominal distension and failure to pass meconium within the first 24–48 hours of life indicates a **neonatal intestinal obstruction**. **Why Meckel’s Diverticulum is the Correct Answer:** Meckel’s diverticulum is a vestigial remnant of the omphalomesenteric (vitelline) duct. While it is the most common congenital anomaly of the GI tract, it is typically **asymptomatic in the neonatal period**. When it does present (usually in toddlers), it manifests as painless lower GI bleeding (due to ectopic gastric mucosa) or intussusception. It does not cause a primary failure to pass meconium or generalized neonatal bowel obstruction. **Analysis of Incorrect Options:** * **Hirschsprung Disease:** The most common cause of lower GI obstruction in neonates. It is characterized by an aganglionic segment in the colon, leading to a failure of relaxation and subsequent failure to pass meconium. * **Distal Intestinal Atresia:** Atresias (ileal or colonic) present early with abdominal distension and obstipation because the intestinal lumen is physically discontinuous. * **Intestinal Malrotation:** While often presenting with volvulus and bilious vomiting, malrotation can cause acute bowel obstruction and distension in the neonatal period. **NEET-PG High-Yield Pearls:** * **Rule of 2s (Meckel’s):** 2% of the population, 2 inches long, 2 feet from the ileocecal valve, 2 types of ectopic tissue (gastric/pancreatic), presents by age 2. * **Meconium Plug Syndrome:** Often associated with Cystic Fibrosis or maternal diabetes. * **Hirschsprung Diagnosis:** Gold standard is a **rectal suction biopsy** showing absence of ganglion cells and hypertrophied nerve bundles.

Q: A neonate presents with features of hypotonia. What is the probable chromosomal anomaly?

Down's syndrome. **Explanation:** **Down’s Syndrome (Trisomy 21)** is the most common chromosomal cause of neonatal hypotonia. While many genetic disorders present with low muscle tone, Down’s syndrome is classically associated with "generalized floppy infant" syndrome. The hypotonia in these neonates is often accompanied by a poor Moro reflex, hyperflexibility of joints, and a flat facial profile. **Analysis of Options:** * **Down’s Syndrome (Correct):** Beyond hypotonia, key neonatal findings include upslanting palpebral fissures, Brushfield spots, Simian crease, and a wide gap between the first and second toes (sandal gap). * **Patau Syndrome (Trisomy 13):** Characterized by "midline defects." Common features include microphthalmia, cleft lip/palate, and post-axial polydactyly. While they may be weak, hypotonia is not the defining clinical hallmark compared to these structural malformations. * **Edward’s Syndrome (Trisomy 18):** Typically presents with hypertonia (spasticity) rather than hypotonia. Key features include clenched fists with overlapping fingers, rocker-bottom feet, and micrognathia. * **Noonan Syndrome:** Often called "Pseudo-Turner syndrome," it presents with short stature, webbed neck, and pulmonary stenosis. While mild motor delays occur, it is not a primary differential for acute neonatal hypotonia. **Clinical Pearls for NEET-PG:** * **Hall’s Criteria:** A 10-point checklist used to clinical diagnose Down's syndrome in neonates; hypotonia is one of the most sensitive signs. * **Differential Diagnosis of Floppy Infant:** Always consider **Prader-Willi Syndrome** (marked hypotonia and feeding difficulties) and **Spinal Muscular Atrophy (SMA) Type 1** (Werdnig-Hoffmann disease) if Down's syndrome is ruled out. * **Most common cardiac defect in Down's:** Endocardial cushion defect (AVSD).

Question 1

What is the drug of choice for neonatal seizures?

Accepted Answer

Phenobarbitone

Answer

Phenytoin

Answer

Diazepam

Answer

Sodium valproate

Question 2

Edema of hands and feet in infants is characterized by which of the following conditions?

Accepted Answer

Turner syndrome

Answer

Klinefelter syndrome

Answer

Noonan syndrome

Answer

Fragile X syndrome

Question 3

A 20-day-old infant presents with fever and irritability. Fontanelles are bulging and neck stiffness is present. Which of the following is the commonest cause of meningitis in the postneonatal period?

Accepted Answer

Listeria monocytogenes

Answer

Mycobacterium tuberculosis

Answer

Staphylococcus aureus

Answer

Streptococcus pneumoniae

Question 4

A female infant is born approximately 10 weeks prematurely (at 30 weeks) and weighs 1710 gm. She has respiratory distress syndrome and is treated with exogenous surfactant. She is intubated endotracheally with mechanical ventilation immediately after birth. Over the first 4 days after birth, the ventilator pressure and the fraction of inspired oxygen are reduced. Beginning on the fifth day after birth, she has brief desaturations that become more persistent. She needs increased ventilator and oxygen support on the seventh day after birth. She becomes cyanotic. Further examination, echocardiogram, and x-rays reveal left atrial enlargement, an enlarged pulmonary artery, increased pulmonary vasculature, and a continuous machine-like murmur. Which of the following is the most likely diagnosis?

Accepted Answer

Patent ductus arteriosus

Answer

Persistent foramen ovale

Answer

Ventricular septal defect

Answer

Pulmonary stenosis

Question 5

A 3-month-old boy is brought to the physician because his parents cannot find one of his testicles. Physical examination confirms the parents' observation. Which of the following is the most likely diagnosis?

Accepted Answer

Cryptorchidism

Answer

Anorchia

Answer

Klinefelter syndrome

Answer

Macroorchidism

Question 6

Which of the following is associated with cystic hygroma?

Accepted Answer

Turner's syndrome

Answer

Down's syndrome

Answer

Marfan's syndrome

Answer

Cushing's syndrome

Question 7

Caput succedaneum is said to occur in relation to which event?

Accepted Answer

During childbirth

Answer

Within 24 hours after birth

Answer

Within 2-3 days after birth

Answer

Within 2-3 weeks after birth

Question 8

Children born to mothers with Systemic Lupus Erythematosus (SLE) are likely to have which of the following anomalies?

Accepted Answer

Complete heart block

Answer

Atrial Septal Defect (ASD)

Answer

Tetralogy of Fallot (TOF)

Answer

Transposition of the Great Arteries (TGA)

Question 9

A neonate presents with a distended abdomen and failure to pass meconium. Which of the following conditions can be ruled out?

Accepted Answer

Meckel's diverticulum

Answer

Intestinal malrotation

Answer

Hirschsprung disease

Answer

Distal intestinal atresia

Question 10

A neonate presents with features of hypotonia. What is the probable chromosomal anomaly?

Accepted Answer

Down's syndrome

Answer

Patau syndrome

Answer

Edward's syndrome

Answer

Noonan syndrome

Neonatology — MCQs

Neonatology — MCQs

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