Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 351: All of the following conditions are more common in preterm neonates EXCEPT?

A. Intraventricular hemorrhage
B. Bronchopulmonary dysplasia
C. Respiratory distress syndrome
D. Meconium aspiration syndrome (Correct Answer)

Explanation: **Explanation:** The correct answer is **Meconium Aspiration Syndrome (MAS)**. **Why Meconium Aspiration Syndrome (MAS) is the exception:** MAS is primarily a disease of **term and post-term neonates**. The passage of meconium in utero requires two physiological factors: a mature gastrointestinal tract (with motilin-mediated peristalsis) and a mature anal sphincter. Preterm infants rarely pass meconium because their gut motility is immature and the anal sphincter is usually tightly constricted. MAS typically occurs when a post-term fetus experiences hypoxia, leading to vagal stimulation, sphincter relaxation, and gasping movements that draw meconium into the lungs. **Why the other options are incorrect:** * **Respiratory Distress Syndrome (RDS):** Caused by a deficiency of surfactant. Since surfactant production begins significantly after 24 weeks and matures near term, the risk is inversely proportional to gestational age (more common in preterms). * **Intraventricular Hemorrhage (IVH):** Preterm infants have a highly vascularized, fragile **germinal matrix** that lacks structural support. Fluctuations in cerebral blood flow easily lead to rupture and hemorrhage. * **Bronchopulmonary Dysplasia (BPD):** This is a chronic lung disease resulting from the management of RDS (oxygen toxicity and barotrauma) in immature lungs. It is almost exclusively seen in very low birth weight preterm infants. **High-Yield Clinical Pearls for NEET-PG:** * **MAS Risk Factor:** Post-maturity (Gestational age >42 weeks) is the strongest risk factor. * **RDS Hallmark:** "Ground glass opacities" and air bronchograms on X-ray. * **IVH Screening:** Routine screening via Cranial Ultrasound is recommended for all neonates born <32 weeks. * **Necrotizing Enterocolitis (NEC):** Another high-yield condition significantly more common in **preterm** infants compared to term infants.

Question 352: A large for gestational age baby delivered at 40 weeks was observed to be lethargic. The blood sugar was measured to be 35 mg/dL. What is the appropriate management?

A. Fortified breast milk
B. 10% IV Dextrose (Correct Answer)
C. Oral glucose solution
D. Normal saline

Explanation: **Explanation:** The core issue in this clinical scenario is **Symptomatic Neonatal Hypoglycemia**. In neonates, hypoglycemia is generally defined as blood glucose **<40 mg/dL**. This baby is "Large for Gestational Age" (LGA), a known risk factor often associated with maternal diabetes and fetal hyperinsulinism. **1. Why 10% IV Dextrose is correct:** The presence of clinical symptoms (**lethargy**) in a hypoglycemic neonate is a medical emergency. Symptomatic hypoglycemia must be treated immediately with parenteral glucose to prevent neurological damage and seizures. The standard protocol is a **bolus of 2 ml/kg of 10% Dextrose (D10W)**, followed by a continuous glucose infusion (GIR) of 6–8 mg/kg/min. **2. Why other options are incorrect:** * **A & C (Fortified breast milk/Oral glucose):** Enteral feeding is only appropriate for *asymptomatic* babies with borderline low sugars. In a lethargic baby, there is a high risk of aspiration, and oral absorption is too slow to rapidly correct the neuroglycopenia. * **D (Normal saline):** This is used for volume expansion in shock or dehydration but does not contain glucose and will not correct hypoglycemia. **High-Yield Clinical Pearls for NEET-PG:** * **Target Glucose:** Aim to maintain blood glucose >45 mg/dL in the first 24 hours and >50 mg/dL thereafter. * **Screening:** High-risk babies (SGA, LGA, Infants of Diabetic Mothers, Preterm) should be screened at 2, 6, 12, and 24 hours of life. * **Whipple’s Triad:** (1) Symptoms of hypoglycemia, (2) Low plasma glucose, (3) Relief of symptoms after raising glucose levels. * **Refractory Hypoglycemia:** If glucose requirements exceed 12 mg/kg/min, consider investigations for hyperinsulinism or metabolic disorders and treatments like Hydrocortisone or Glucagon.

Question 353: All of the following are ways of surfactant administration except?

A. InSurE technique
B. HISA technique (Correct Answer)
C. LISA technique
D. MIST technique

Explanation: Surfactant replacement therapy is a cornerstone in managing Respiratory Distress Syndrome (RDS) in neonates. The goal of modern neonatology is to administer surfactant while minimizing invasive mechanical ventilation to prevent bronchopulmonary dysplasia. **Why Option B (HISA) is the correct answer:** There is no recognized medical procedure called the **HISA technique** in surfactant administration. This is a distractor term. **Explanation of Incorrect Options (Standard Techniques):** * **InSurE (Intubate-Surfactant-Extubate):** The traditional method where a baby is intubated, given surfactant via an endotracheal tube, and extubated to CPAP within an hour. * **LISA (Less Invasive Surfactant Administration):** Surfactant is delivered via a thin, flexible catheter (like a gastric tube) into the trachea while the infant remains on non-invasive ventilation (CPAP). * **MIST (Minimally Invasive Surfactant Therapy):** Often used interchangeably with LISA, this specifically refers to using a more rigid vascular catheter (e.g., Hobart or Angiocath) to deliver surfactant without formal intubation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Source:** Natural surfactants (e.g., **Poractant alfa/Curosurf**) are preferred over synthetic ones due to faster action and lower mortality. 2. **Timing:** "Early rescue" (within 2 hours of birth) is superior to late administration. 3. **LISA/MIST Advantage:** These techniques significantly reduce the need for mechanical ventilation and the incidence of BPD compared to InSurE. 4. **SALSA:** A newer experimental method is **S**urfactant **A**dministration through **L**aryngeal **M**ask **A**irway.

Question 354: An APGAR score of 6 indicates which of the following conditions in a newborn?

A. Normal condition
B. Mild depression (Correct Answer)
C. Severe depression
D. Immediate resuscitation required

Explanation: The APGAR score is a rapid clinical assessment tool used at 1 and 5 minutes after birth to evaluate a newborn’s transition to extrauterine life. It assesses five parameters: Heart rate, Respiratory effort, Muscle tone, Reflex irritability, and Color. Each is scored from 0 to 2, with a maximum total score of 10. **Explanation of Options:** * **Correct Answer (B):** An APGAR score of **4 to 6** is classified as **Mild (or Moderate) depression**. These infants may require stimulation, tactile rubbing, or oxygen administration, but they generally do not require full-scale resuscitation. * **Option A:** A score of **7 to 10** is considered **Normal** (Excellent condition). These infants require only routine post-natal care. * **Option C & D:** A score of **0 to 3** indicates **Severe depression**. This is a medical emergency that signifies the need for **immediate resuscitation** (Option D), including bag-and-mask ventilation or chest compressions. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** **A**ppearance (Color), **P**ulse (Heart rate), **G**rimace (Reflex), **A**ctivity (Tone), **R**espiration. * **Most Important Parameter:** Heart rate is the most critical prognostic indicator. * **Sequence of Disappearance:** In neonatal distress, the signs disappear in the following order: Color → Respiration → Muscle Tone → Reflex irritability → Heart rate. * **Prognostic Value:** The 1-minute score correlates with the need for immediate intervention, while the 5-minute score is a better predictor of long-term neurological outcomes. * **Limitation:** APGAR score should **not** be used to delay the start of resuscitation; if the baby is apneic or gasping, resuscitation must begin immediately.

Question 355: After premature delivery, mother's milk contains more amount of each of the following except:

A. Lactose (Correct Answer)
B. Fat
C. Protein
D. Sodium

Explanation: **Explanation:** The composition of breast milk is uniquely adapted to the gestational age of the infant. **Preterm milk** (milk produced by mothers who deliver before 37 weeks) differs significantly from **term milk** to meet the higher metabolic and growth demands of a premature baby. **Why Lactose is the correct answer:** Lactose levels are actually **lower** in preterm milk compared to term milk. This is a physiological adaptation because premature infants often have lower levels of intestinal lactase enzyme. A lower lactose content helps prevent osmotic diarrhea and excessive fermentation in the immature gut. As the lactation period progresses, lactose levels gradually increase. **Why the other options are incorrect:** * **Protein:** Preterm milk has significantly **higher** protein content (especially whey protein) to support rapid tissue growth and brain development in the neonate. * **Fat:** The lipid content is **higher** in preterm milk, providing the dense caloric intake required for weight gain. It also contains higher concentrations of long-chain polyunsaturated fatty acids (LC-PUFAs) like DHA for retinal and neural development. * **Sodium (and other electrolytes):** Preterm milk contains **higher** amounts of sodium, chloride, and magnesium. This compensates for the increased urinary loss of electrolytes due to the immature renal tubules of a premature infant. **High-Yield NEET-PG Pearls:** * **Preterm Milk vs. Term Milk:** Preterm milk is higher in Protein, Fat, Sodium, Chloride, IgA, and Lactoferrin, but **lower in Lactose, Calcium, and Phosphorus.** * **Caloric Density:** Preterm milk provides approximately 67-70 kcal/100ml. * **Fortification:** Despite the higher nutrient density, preterm milk still lacks sufficient Calcium and Phosphorus to prevent Metabolic Bone Disease of Prematurity, often requiring the addition of Human Milk Fortifiers (HMF).

Question 356: Neonatal alloimmune thrombocytopenia is caused by?

A. B19 parvovirus infection
B. Maternal-fetal platelet antigen disparity (Correct Answer)
C. Cytomegalovirus infection
D. Sepsis

Explanation: **Explanation:** **Neonatal Alloimmune Thrombocytopenia (NAIT)** is the platelet equivalent of Rh incompatibility. It occurs due to **maternal-fetal platelet antigen disparity**, most commonly involving the **Human Platelet Antigen 1a (HPA-1a)**. The underlying mechanism involves a mother who lacks a specific platelet antigen (usually HPA-1a negative) being exposed to fetal platelets carrying that antigen (inherited from the father). The mother develops IgG antibodies against these foreign antigens, which cross the placenta and cause sequestration and destruction of fetal platelets in the spleen. Unlike Rh disease, NAIT can occur during the **first pregnancy**. **Analysis of Incorrect Options:** * **A & C (B19 Parvovirus and CMV):** These are TORCH infections. While they can cause thrombocytopenia, it is usually due to bone marrow suppression or hypersplenism associated with systemic illness, not an alloimmune mechanism. * **D (Sepsis):** This is a common cause of neonatal thrombocytopenia due to increased platelet consumption (DIC) and marrow suppression, but it is an acquired, non-immune process. **High-Yield Clinical Pearls for NEET-PG:** * **Most common antigen:** HPA-1a (involved in >80% of cases). * **Clinical Presentation:** A healthy-appearing term neonate with isolated, severe thrombocytopenia and petechiae/purpura within hours of birth. * **Dreaded Complication:** Intracranial Hemorrhage (ICH) occurs in 10-20% of cases, often in utero. * **Treatment:** Transfusion of **washed maternal platelets** (since they lack the offending antigen) or HPA-matched platelets. IVIG is the first-line medical management for the neonate. * **Distinction:** In **Maternal ITP**, the mother has a low platelet count; in **NAIT**, the mother’s platelet count is always **normal**.

Question 357: Pneumatosis intestinalis is diagnostic of:

A. Ileal perforation
B. Necrotizing enterocolitis (Correct Answer)
C. Meconium ileus
D. Colonic aganglionosis

Explanation: **Explanation:** **Pneumatosis intestinalis** is the pathognomonic radiographic finding for **Necrotizing Enterocolitis (NEC)**. It refers to the presence of gas within the subserosal or submucosal layers of the bowel wall. This occurs when the mucosal barrier is breached, allowing gas-producing bacteria to invade the intestinal wall, leading to intramural air collection. On an X-ray, this appears as linear or curvilinear lucencies following the contour of the bowel loops. **Analysis of Options:** * **Necrotizing Enterocolitis (NEC):** This is the most common gastrointestinal emergency in neonates (especially preterm). Pneumatosis intestinalis is the hallmark of Bell’s Stage II (Definite NEC). * **Ileal Perforation:** While NEC can lead to perforation, the specific sign for perforation is **pneumoperitoneum** (free air under the diaphragm or the "Football sign"), not intramural air. * **Meconium Ileus:** Associated with Cystic Fibrosis, this typically presents with a "soap-bubble" appearance (Neuhauser’s sign) in the right iliac fossa due to air mixing with thick meconium, but not air within the bowel wall. * **Colonic Aganglionosis (Hirschsprung Disease):** Characterized by a transition zone and dilated proximal loops. While it can lead to enterocolitis (HAEC), pneumatosis is not its primary diagnostic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Bell’s Staging:** Stage I (Suspected), Stage II (Pneumatosis intestinalis), Stage III (Pneumoperitoneum/Shock). * **Portal Venous Gas:** A sign of advanced NEC, indicating gas has traveled from the bowel wall into the mesenteric circulation. * **Risk Factors:** Prematurity, formula feeding, and intestinal ischemia. * **Management:** NPO, gastric decompression, antibiotics, and surgery if perforation occurs.

Question 358: Polycythemia vera is defined by an absolute venous hematocrit of >

A. 45%
B. 55% (Correct Answer)
C. 65%
D. 70%

Explanation: **Explanation:** **Neonatal Polycythemia** is defined as an absolute venous hematocrit of **>65%** or a hemoglobin concentration **>22 g/dL**. However, the term **Polycythemia Vera** (a primary myeloproliferative neoplasm) in the general medical context is defined by different criteria. According to the WHO criteria for Polycythemia Vera, the diagnosis is considered when the hematocrit is **>55% in men** and **>48% in women**. In the context of this specific question (often found in older pediatric/neonatology question banks), the value **55%** is frequently cited as the threshold for "Polycythemia Vera" or symptomatic polycythemia in older children/adults, whereas **65%** is the strict cutoff for **Neonatal Polycythemia**. **Analysis of Options:** * **Option A (45%):** This is the normal upper limit for hematocrit in healthy adults and older children; it does not signify polycythemia. * **Option B (55%):** Correct for Polycythemia Vera (WHO criteria). In neonates, this value would be considered normal, as their hematocrit naturally peaks at 6-8 hours of life. * **Option C (65%):** This is the diagnostic threshold for **Neonatal Polycythemia**. If the question specifically asked for "Neonatal Polycythemia," this would be the answer. * **Option D (70%):** This value indicates extreme polycythemia/hyperviscosity, usually requiring immediate partial exchange transfusion in neonates. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Diagnosis:** Always use **venous blood**; capillary samples (heel pricks) often give falsely high hematocrit values due to stasis. * **Peak Timing:** Hematocrit in a newborn peaks at **6–12 hours** of age. * **Clinical Features:** Most neonates are asymptomatic, but "Ruddy" appearance (plethora), hypoglycemia, hyperbilirubinemia, and jitteriness are common. * **Treatment:** The mainstay of treatment for symptomatic neonatal polycythemia is **Partial Exchange Transfusion (PET)** using normal saline.

Question 359: A 2-day-old neonate presents with bilious vomiting and abdominal distension. The mother had polyhydramnios diagnosed antenatally. An abdominal X-ray shows a "double bubble" sign with no distal bowel gas. What is the most common anomaly associated with this presentation?

A. Trisomy 13
B. Trisomy 18
C. Trisomy 21 (Correct Answer)
D. Trisomy 16

Explanation: ***Trisomy 21*** - **Duodenal atresia** (indicated by the **double bubble sign** on X-ray) is associated with **Trisomy 21 (Down syndrome)** in approximately **30% of cases**, making it the most common chromosomal anomaly linked to this condition. - The combination of **bilious vomiting**, **abdominal distension**, and **polyhydramnios** strongly suggests duodenal atresia, which has a well-established association with **Down syndrome**. *Trisomy 13* - **Patau syndrome** is associated with severe **central nervous system defects**, **holoprosencephaly**, and **cardiac anomalies**, but not typically with duodenal atresia. - Neonates with Trisomy 13 usually present with **microcephaly**, **cleft lip/palate**, and severe developmental abnormalities rather than isolated gastrointestinal obstruction. *Trisomy 18* - **Edwards syndrome** is associated with **cardiac defects**, **growth retardation**, and **clenched fists**, but duodenal atresia is not a common feature. - Neonates typically present with **low birth weight**, **prominent occiput**, and **overlapping fingers** rather than isolated bowel obstruction. *Trisomy 18* - This is a duplicate option and represents **Edwards syndrome**, which is not commonly associated with **duodenal atresia**. - The clinical presentation would typically include **severe growth restriction**, **cardiac anomalies**, and distinctive **facial features** rather than isolated gastrointestinal obstruction.

Question 360: In a premature baby with convulsions presenting 2 days after birth, what is the first investigation to be performed?

A. Transcranial ultrasonography (Correct Answer)
B. Magnetic resonance imaging (MRI)
C. Skull radiography
D. Computed tomography (CT) scan of the skull

Explanation: **Explanation:** The correct answer is **Transcranial Ultrasonography (T-USG)**. **Why it is the correct answer:** In a **premature neonate**, the most common cause of convulsions occurring within the first 2–3 days of life is **Intraventricular Hemorrhage (IVH)**, originating from the fragile germinal matrix. T-USG is the investigation of choice because: 1. **Accessibility:** It can be performed bedside in the NICU without moving a critically ill, ventilated neonate. 2. **Anatomy:** The **anterior fontanelle** acts as an acoustic window, allowing excellent visualization of the periventricular area and ventricles. 3. **Safety:** It involves no ionizing radiation and does not require sedation. **Why other options are incorrect:** * **MRI:** While MRI is the most sensitive for identifying subtle brain injuries (like HIE or cortical dysgenesis), it is time-consuming, requires sedation, and necessitates transporting an unstable neonate out of the NICU. It is usually a secondary investigation. * **CT Scan:** CT involves high doses of ionizing radiation. It is generally reserved for suspected posterior fossa bleeds or acute trauma where USG is inconclusive. * **Skull Radiography:** X-rays only visualize bony structures and are useless for evaluating intracranial pathology like hemorrhage or edema. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** IVH typically occurs within the first 72 hours of life. * **Screening:** Routine T-USG screening is recommended for all neonates born **<32 weeks** gestation or **<1500g** (VLBW) at 7–10 days of life. * **Most common cause of neonatal seizures (Overall):** Perinatal Asphyxia (Hypoxic-Ischemic Encephalopathy), usually presenting within the first 24 hours. * **Drug of Choice:** Phenobarbital remains the first-line anticonvulsant for neonatal seizures.

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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