Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 311: After 3 days of birth, the base of the umbilical cord is red and swollen. What does this indicate?

A. Normal phenomenon
B. Congestive heart failure
C. Infection (Correct Answer)
D. Clotting factor deficiency

Explanation: **Explanation:** The clinical presentation of redness and swelling at the base of the umbilical cord in a 3-day-old neonate is a classic sign of **Omphalitis**. **1. Why 'Infection' is correct:** Omphalitis is a polymorphonulcear infection of the umbilical cord stump and surrounding tissues. The umbilical stump is a necrotic tissue that serves as an excellent culture medium for bacteria (most commonly *Staphylococcus aureus*, *Streptococcus pyogenes*, or Gram-negative organisms). The cardinal signs of inflammation—**rubor (redness), tumor (swelling), and calor (heat)**—at the cord base indicate an active infection that requires prompt antibiotic therapy to prevent systemic sepsis or portal vein thrombosis. **2. Why other options are incorrect:** * **Normal phenomenon:** While the cord undergoes dry gangrene and shrivels before falling off (usually between 7–14 days), the surrounding skin should remain healthy. Redness and edema extending to the abdominal wall are always pathological. * **Congestive heart failure:** This typically presents with tachypnea, hepatomegaly, and cardiomegaly; it does not cause localized umbilical inflammation. * **Clotting factor deficiency:** This would manifest as persistent oozing or bleeding from the cord (common in Vitamin K deficiency or Afibrinogenemia), not inflammatory signs like swelling and redness. **High-Yield Clinical Pearls for NEET-PG:** * **Delayed separation of the cord:** If the cord does not fall off within 3 weeks, suspect **Leukocyte Adhesion Deficiency (LAD)**. * **Umbilical Granuloma:** A common cause of a moist, pinkish cord base after separation; treated with **Silver Nitrate** cauterization. * **Prevention:** The WHO currently recommends **dry cord care** in hospital settings, but application of **7.1% Chlorhexidine** is advised for home births in high-neonatal-mortality settings to prevent omphalitis.

Question 312: A newborn presents with jaundice within the first 24 hours of life. The mother's blood group is O positive. What is the next line of management?

A. Wait for serum bilirubin level before starting treatment
B. Phototherapy (Correct Answer)
C. Exchange transfusion
D. Stop breastfeeding

Explanation: **Explanation:** The presence of jaundice within the **first 24 hours of life** is always considered **pathological jaundice** until proven otherwise. In this scenario, the mother is O positive, suggesting a high clinical suspicion of **ABO incompatibility** (where the mother is O and the baby is A or B). 1. **Why Phototherapy is correct:** According to the American Academy of Pediatrics (AAP) and NNF guidelines, any visible jaundice appearing within 24 hours of birth requires immediate intervention to prevent bilirubin encephalopathy (Kernicterus). Phototherapy is the first-line treatment to convert unconjugated bilirubin into water-soluble isomers (lumirubin) that can be excreted. You do not wait for lab results if jaundice is clinically significant in the first day of life. 2. **Why other options are incorrect:** * **Option A:** Waiting for serum bilirubin levels is dangerous. In early-onset jaundice, the rate of bilirubin rise is often rapid; treatment should be initiated immediately while awaiting laboratory confirmation. * **Option C:** Exchange transfusion is a second-line, more invasive procedure reserved for cases where phototherapy fails or bilirubin levels are dangerously high (usually >20-25 mg/dL) or if there are signs of acute bilirubin encephalopathy. * **Option D:** Stopping breastfeeding is contraindicated. In fact, frequent breastfeeding (8-12 times a day) is encouraged to promote bowel movements and the excretion of bilirubin. **Clinical Pearls for NEET-PG:** * **Most common cause of jaundice in the first 24 hours:** Hemolytic disease (Rh isoimmunization, ABO incompatibility, or minor group incompatibility). * **Kramer’s Rule:** Used to clinically estimate bilirubin levels based on the cephalocaudal progression of jaundice. * **ABO Incompatibility:** Most common cause of hemolytic disease of the newborn, but usually less severe than Rh incompatibility. * **Rule of Thumb:** Jaundice appearing <24 hours, bilirubin rising >5mg/dL/day, or conjugated bilirubin >2mg/dL is always pathological.

Question 313: Phenobarbitone is used in which of the following conditions?

A. Organophosphate poisoning
B. Carbamate poisoning
C. Neonatal jaundice (Correct Answer)
D. Phenol poisoning

Explanation: **Explanation:** **Phenobarbitone** is a barbiturate that acts as a potent **inducer of the hepatic enzyme Glucuronyl transferase**. In the context of neonatal jaundice, it enhances the conjugation of bilirubin and increases its excretion by improving hepatic uptake and bile flow. 1. **Why Neonatal Jaundice is correct:** Phenobarbitone is specifically used in the management of **Crigler-Najjar Syndrome Type II (Arias Syndrome)** and sometimes in prolonged unconjugated hyperbilirubinemia. By inducing glucuronyl transferase, it effectively lowers serum bilirubin levels. However, it is not used for routine physiological jaundice due to its sedative side effects and the time required (3–7 days) to achieve therapeutic efficacy. 2. **Why the other options are incorrect:** * **Organophosphate (OP) and Carbamate poisoning:** These are treated with **Atropine** (muscarinic antagonist) and **Pralidoxime** (PAM - oxime, used only for OP). Phenobarbitone has no role here and may worsen respiratory depression. * **Phenol poisoning:** Management involves immediate decontamination (washing with PEG or water) and supportive care. Phenobarbitone is not an antidote. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC) for Neonatal Seizures:** Phenobarbitone remains the first-line treatment. * **Crigler-Najjar Differentiation:** A significant drop in bilirubin after Phenobarbitone administration differentiates **Type II** (responsive) from **Type I** (non-responsive). * **Side Effects:** Drowsiness, respiratory depression, and potential long-term effects on cognitive development. * **Enzyme Induction:** It also induces the Cytochrome P450 system, leading to numerous drug interactions.

Question 314: What is the cause of "bloody" vomitus in a neonate?

A. Meckel's diverticulum
B. Intussusception
C. Malrotation
D. None of the above (Correct Answer)

Explanation: The correct answer is **None of the above** because the most common cause of "bloody" vomitus (hematemesis) in a neonate is **Apt’s test-positive swallowed maternal blood**, typically occurring during delivery or from cracked nipples during breastfeeding. ### **Explanation of the Correct Answer** In the immediate neonatal period, if a baby vomits blood, the first step is to differentiate between fetal blood and maternal blood using the **Apt-Downey test** (Alkali Denaturation Test). * If the blood is maternal (HbA), it turns yellow-brown when exposed to alkali (KOH). * If the blood is fetal (HbF), it remains pink because fetal hemoglobin is resistant to alkali. The options provided (Meckel’s, Intussusception, Malrotation) typically present with **lower GI bleeding** (melena or hematochezia) or **bilious vomiting**, rather than hematemesis. ### **Why Other Options are Incorrect** * **A. Meckel’s Diverticulum:** While it is a common cause of painless, massive rectal bleeding (painless hematochezia), it rarely presents in the neonatal period and does not cause hematemesis. * **B. Intussusception:** This typically presents in infants aged 6–18 months with "red currant jelly" stools and colicky pain. It is extremely rare in neonates. * **C. Malrotation with Volvulus:** This is a surgical emergency in neonates, but the hallmark clinical sign is **bilious (green) vomiting**, not bloody vomiting. ### **NEET-PG High-Yield Pearls** * **Apt Test:** Uses 1% NaOH. Pink = Fetal (Baby); Yellow/Brown = Maternal (Mother). * **Differential for Neonatal Hematemesis:** Swallowed maternal blood (most common), Vitamin K deficiency (Hemorrhagic Disease of the Newborn), or Gastritis. * **NEC (Necrotizing Enterocolitis):** Look for abdominal distension, pneumatosis intestinalis on X-ray, and bloody stools in a preterm neonate.

Question 315: Bronze baby syndrome is due to which of the following?

A. Phototherapy (Correct Answer)
B. Wilson disease
C. Chloramphenicol toxicity
D. Hemochromatosis

Explanation: **Explanation:** **Bronze Baby Syndrome** is a rare clinical complication that occurs in neonates receiving **phototherapy** for neonatal jaundice. 1. **Why Phototherapy is correct:** The syndrome occurs specifically in neonates with **conjugated hyperbilirubinemia** (cholestatic jaundice). When these infants are treated with phototherapy, the light causes the photo-oxidation of copper-porphyrins and other bile pigments. These photo-isomers cannot be excreted efficiently due to cholestasis, leading to their accumulation in the skin, serum, and urine, which imparts a characteristic **grayish-brown (bronze)** discoloration. While the appearance is alarming, it is generally a self-limiting condition that resolves once phototherapy is discontinued and the underlying cholestasis improves. 2. **Why other options are incorrect:** * **Wilson disease:** A disorder of copper metabolism that typically presents in older children or adolescents with hepatic or neurological symptoms, not as a neonatal "bronze" skin reaction. * **Chloramphenicol toxicity:** Causes **Gray Baby Syndrome**, characterized by abdominal distension, cyanosis, and cardiovascular collapse due to the neonate's inability to conjugate the drug. * **Hemochromatosis:** A disorder of iron overload. While it can cause skin hyperpigmentation (often called "bronze diabetes"), it is not a neonatal condition related to phototherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisite:** Bronze Baby Syndrome *only* occurs if there is an elevated **conjugated** bilirubin component. * **Management:** It is not an absolute contraindication to phototherapy if the indirect bilirubin is dangerously high, but the underlying cause of cholestasis must be investigated. * **Differential Diagnosis:** Do not confuse with **Gray Baby Syndrome** (Chloramphenicol) or **Blue Baby Syndrome** (Cyanotic heart disease/Methemoglobinemia).

Question 316: Antibodies for which of the following conditions are NOT transmitted from mother to fetus?

A. Rh-incompatibility
B. Isoimmune thrombocytopenia
C. Toxic erythema (Correct Answer)
D. Myasthenia gravis

Explanation: **Explanation:** The core concept tested here is the **transplacental transfer of IgG antibodies**. Only IgG antibodies can cross the placenta from the mother to the fetus. If a mother has circulating IgG antibodies against specific fetal/neonatal antigens, those antibodies can cause transient neonatal disease. * **Why Toxic Erythema is the correct answer:** **Erythema Toxicum Neonatorum (ETN)** is a benign, self-limiting, idiopathic cutaneous eruption seen in newborns. It is **not an antibody-mediated condition**. Its etiology is thought to be an inflammatory response involving the activation of the immune system (specifically eosinophils) to commensal skin flora or hair follicles. Since no maternal antibodies are involved, it cannot be "transmitted" from the mother. * **Why the other options are incorrect:** * **Rh-incompatibility:** Caused by maternal **anti-D IgG antibodies** crossing the placenta and attacking fetal Rh-positive RBCs (Type II Hypersensitivity). * **Isoimmune thrombocytopenia:** Occurs when maternal **IgG antibodies against fetal platelet antigens** (usually HPA-1a) cross the placenta, leading to fetal platelet destruction. * **Myasthenia gravis:** "Transient Neonatal Myasthenia" occurs when maternal **anti-acetylcholine receptor (AChR) IgG antibodies** cross the placenta, causing temporary muscle weakness in the neonate. **High-Yield Clinical Pearls for NEET-PG:** 1. **IgG** is the only immunoglobulin that crosses the placenta (via neonatal Fc receptors). **IgM and IgA do not.** 2. **Erythema Toxicum:** Characterized by "flea-bite" appearance; Tzanck smear shows **eosinophils**. It typically spares the palms and soles. 3. Other conditions caused by transplacental IgG: Neonatal Lupus (anti-Ro/La), Neonatal Graves’ disease (TSH-receptor antibodies), and Pemphigus vulgaris.

Question 317: Salmon patch usually disappears by what age?

A. One month
B. One year (Correct Answer)
C. Puberty
D. None of the above

Explanation: **Explanation:** **Salmon patches** (also known as Nevus Simplex) are the most common vascular lesions in neonates, occurring in approximately 40–50% of newborns. They are caused by the distension of dermal capillaries (capillary malformations). 1. **Why Option B is correct:** Most salmon patches are transient. Lesions located on the eyelids, glabella (Angel’s kiss), and upper lip typically fade and disappear due to the maturation of the skin and regression of the capillaries, usually by **one year of age**. 2. **Why Option A is incorrect:** One month is too early for complete regression. While they may begin to lighten, the majority require several months to fully resolve. 3. **Why Option C is incorrect:** Unlike Port-wine stains (Nevus Flammeus), which persist throughout life and grow with the child, salmon patches do not last until puberty. The only exception is the "Stork bite" (nuchal lesion), which may persist into adulthood in about 50% of cases but remains benign. **NEET-PG High-Yield Pearls:** * **Terminology:** Known as **"Angel’s kiss"** when on the forehead/eyelids and **"Stork bite"** when on the nape of the neck. * **Clinical Feature:** They become more prominent during crying, straining, or changes in temperature. * **Management:** Reassurance is the key; no medical or surgical treatment is required as they are benign and self-limiting. * **Differentiating Point:** Unlike Hemangiomas (which appear after birth and proliferate), Salmon patches are present **at birth**. Unlike Port-wine stains, they are **blanchable** and typically midline/symmetrical.

Question 318: Peripheral smear of a neonate with ABO incompatibility typically shows which of the following?

A. Microspherocytes (Correct Answer)
B. Elliptocytes
C. Fragmented RBCs
D. Polychromasia

Explanation: **Explanation:** In **ABO Incompatibility**, the presence of **Microspherocytes** on a peripheral smear is a hallmark finding. This occurs because maternal IgG antibodies (anti-A or anti-B) cross the placenta and bind to the neonate’s RBCs. Splenic macrophages then "nibble" away portions of the antibody-coated RBC membrane. The cell loses surface area but retains its volume, forcing it to assume a spherical shape (spherocyte) which is smaller and lacks central pallor. **Analysis of Options:** * **A. Microspherocytes (Correct):** Characteristic of ABO incompatibility. Note that spherocytes are typically **absent** in Rh incompatibility, making this a key differentiating feature. * **B. Elliptocytes:** These are cigar-shaped cells seen in Hereditary Elliptocytosis or iron deficiency anemia, not immune-mediated hemolysis. * **C. Fragmented RBCs (Schistocytes):** These indicate microangiopathic hemolytic anemia (MAHA), such as DIC or HUS, caused by mechanical shearing of RBCs. * **D. Polychromasia:** While polychromasia (representing reticulocytosis) is seen in ABO incompatibility due to the bone marrow's response to hemolysis, it is a **non-specific** finding seen in any hemolytic state. Microspherocytes are the more specific diagnostic clue for ABO disease. **NEET-PG High-Yield Pearls:** 1. **ABO vs. Rh:** ABO incompatibility can occur in the **first pregnancy** (unlike Rh) because anti-A/B antibodies are naturally occurring. 2. **Direct Coombs Test (DCT):** In ABO incompatibility, the DCT is often **weakly positive or negative**, whereas in Rh incompatibility, it is strongly positive. 3. **Blood Groups:** Most commonly occurs when the mother is **O** and the baby is **A or B**. 4. **Clinical Presentation:** Usually presents as mild jaundice within the first 24 hours of life. Severe hydrops is rare compared to Rh disease.

Question 319: Physiological jaundice in a term baby typically lasts up to how many days?

A. 4 days
B. 7 days
C. 10 days (Correct Answer)
D. 14 days

Explanation: **Explanation:** Physiological jaundice is a common, non-pathological condition in neonates caused by the transient inability of the liver to conjugate bilirubin, combined with increased red blood cell turnover. In a **term baby**, serum bilirubin levels typically peak between days 3 and 5 and return to normal levels (less than 2 mg/dL) by **10 days of life**. In contrast, in preterm babies, the peak occurs later (days 5–7) and the jaundice can persist for up to 14 days. **Analysis of Options:** * **A (4 days):** This is usually the timeframe for the *peak* intensity of jaundice in term infants, not the resolution. * **B (7 days):** While many babies show significant decline by one week, the formal definition of the physiological window for term infants extends to 10 days. * **C (10 days):** **Correct.** This marks the upper limit for the resolution of physiological jaundice in term neonates. * **D (14 days):** This is the typical duration for physiological jaundice in **preterm** babies. In term babies, jaundice persisting beyond 14 days is termed "prolonged jaundice" and requires investigation for pathological causes (e.g., biliary atresia or hypothyroidism). **High-Yield Clinical Pearls for NEET-PG:** * **Onset:** Physiological jaundice never appears in the first 24 hours of life (always pathological if it does). * **Bilirubin Type:** It is always **unconjugated** hyperbilirubinemia. * **Rate of Rise:** The serum bilirubin level increases by less than 5 mg/dL per day. * **Peak Levels:** Usually does not exceed 15 mg/dL in term infants. * **Treatment:** Physiological jaundice typically requires no treatment other than frequent breastfeeding.

Question 320: A diabetic female at 40 weeks of gestation delivered a baby by elective cesarean section. Soon after birth, the baby developed respiratory distress. What is the most likely diagnosis?

A. Transient tachypnea of the newborn (Correct Answer)
B. Congenital diaphragmatic hernia
C. Tracheoesophageal fistula
D. Hyaline membrane disease

Explanation: **Explanation:** The most likely diagnosis is **Transient Tachypnea of the Newborn (TTN)**. **Why Option A is correct:** TTN, also known as "Wet Lung," is caused by delayed clearance of fetal lung fluid. The two most significant risk factors present in this clinical vignette are **Elective Cesarean Section** (missing the "thoracic squeeze" of vaginal delivery and the catecholamine surge that triggers fluid resorption) and **Maternal Diabetes**. The respiratory distress typically appears within hours of birth and is characterized by tachypnea, grunting, and retractions. **Why other options are incorrect:** * **B. Congenital Diaphragmatic Hernia:** Usually presents with a scaphoid abdomen and severe respiratory distress immediately at birth. Breath sounds are typically absent on the affected side (usually left). * **C. Tracheoesophageal Fistula:** Presents with excessive salivation, drooling, and choking/cyanosis during the first feed, rather than isolated respiratory distress immediately after a C-section. * **D. Hyaline Membrane Disease (RDS):** While maternal diabetes is a risk factor (insulin antagonizes cortisol's effect on surfactant), RDS is primarily a disease of **preterm** infants. This baby is at 40 weeks (term), making TTN much more statistically likely. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray finding in TTN:** Characterized by "Sunburst appearance," prominent vascular markings, fluid in the interlobar fissures, and occasionally pleural effusion. * **Management:** Usually self-limiting; resolves within 24–72 hours with supportive care (oxygen/CPAP). * **Key Differentiator:** If the question mentions a **term/near-term** baby and **C-section**, always think of **TTN** first. If it mentions **preterm**, think of **RDS**.

Practice by Chapter

Neonatal Resuscitation

Practice Questions

Care of the Normal Newborn

Practice Questions

Prematurity and Low Birth Weight

Practice Questions

Respiratory Distress Syndrome

Practice Questions

Neonatal Jaundice

Practice Questions

Neonatal Sepsis

Practice Questions

Necrotizing Enterocolitis

Practice Questions

Intraventricular Hemorrhage

Practice Questions

Persistent Pulmonary Hypertension

Practice Questions

Perinatal Asphyxia

Practice Questions

Neonatal Seizures

Practice Questions

Congenital Anomalies

Practice Questions

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