Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 111: What is the most common obstetrics nerve palsy observed in newborns?

A. Sural nerve
B. Tibial nerve
C. Common peroneal nerve
D. Facial nerve (Correct Answer)

Explanation: **Explanation:** The **Facial nerve (CN VII)** is the most common birth-related nerve palsy. This injury typically occurs due to compression of the nerve as it exits the stylomastoid foramen. The primary risk factors include **forceps-assisted delivery** (where the forceps blade exerts direct pressure on the nerve) and prolonged labor where the nerve is compressed against the maternal sacral promontory. Clinically, it presents as loss of the nasolabial fold, inability to close the eye, and the mouth drooping toward the unaffected side when the infant cries. Most cases are neuropraxic and resolve spontaneously within weeks. **Analysis of Incorrect Options:** * **Common Peroneal Nerve (C):** While this is the most common lower extremity palsy in adults (due to its superficial position at the fibular head), it is rare in neonates. It may occur due to intrauterine malposition or umbilical artery catheterization complications, but it is far less frequent than facial nerve injury. * **Tibial and Sural Nerves (A & B):** These nerves are deeply seated or located in protected areas. Isolated birth injuries to these nerves are extremely rare and are not characteristic of obstetric trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common peripheral nerve injury:** Brachial plexus injury (Erb’s palsy is the most frequent subtype). * **Most common cranial nerve injury:** Facial nerve (CN VII). * **Differential Diagnosis:** Always distinguish traumatic facial palsy from **Möbius syndrome** (congenital aplasia of the 6th and 7th cranial nerve nuclei), which presents with bilateral involvement and inability to abduct the eyes. * **Management:** Most traumatic facial palsies require only supportive care (e.g., artificial tears to prevent corneal ulceration).

Question 112: Which of the following scoring systems is used to assess respiratory distress in neonates?

A. CRIB score
B. APGAR score
C. Silverman-Anderson score (Correct Answer)
D. SNAP score

Explanation: The **Silverman-Anderson Score** is the gold standard clinical tool used to assess the severity of respiratory distress in neonates, particularly those with Respiratory Distress Syndrome (RDS). ### 1. Why Silverman-Anderson Score is Correct Unlike many scoring systems where a high score is "good," in the Silverman-Anderson score, a **higher score indicates more severe distress**. It evaluates five parameters, each scored from 0 to 2: 1. **Upper chest movements** (Thoraco-abdominal lag/synchrony) 2. **Lower chest retractions** (Intercostal) 3. **Xiphoid retractions** 4. **Nares dilation** (Nasal flaring) 5. **Expiratory grunt** * **Total Score 0:** No respiratory distress. * **Total Score >7:** Impending respiratory failure. ### 2. Why Other Options are Incorrect * **A. CRIB Score (Clinical Risk Index for Babies):** Used to predict **mortality and morbidity** in preterm infants based on birth weight, gestational age, and congenital malformations. * **B. APGAR Score:** Used to assess the **immediate clinical status and transition** of a newborn at 1 and 5 minutes after birth (Heart rate, Respiratory effort, Muscle tone, Reflex irritability, Color). It is not a specific tool for ongoing respiratory distress. * **D. SNAP Score (Score for Neonatal Acute Physiology):** A complex physiology-based score used in the NICU to determine the **severity of illness and risk of mortality** based on multiple organ system parameters. ### 3. High-Yield Clinical Pearls for NEET-PG * **Downe’s Score:** Another high-yield scoring system for respiratory distress, but it is typically used for **term/late-preterm** neonates, whereas Silverman-Anderson is preferred for **preterm** infants. * **Key Difference:** Downe’s score includes **Cyanosis** and **Air entry**, which are not part of the Silverman-Anderson score. * **Silverman-Anderson Mnemonic:** "**U**pper, **L**ower, **X**iphoid, **N**asal, **G**runt" (Think: **U**nder **L**ow **X**-rays, **N**ewborns **G**runt).

Question 113: Which of the following is a risk factor for retinopathy of prematurity (ROP)?

A. Prematurity (born at 28 weeks gestation) (Correct Answer)
B. Respiratory distress syndrome
C. Birth weight of 2.3 kg
D. Neonatal jaundice

Explanation: **Explanation:** **Retinopathy of Prematurity (ROP)** is a vasoproliferative disorder caused by the abnormal development of retinal blood vessels in preterm infants. **Why Option A is Correct:** The primary risk factors for ROP are **low gestational age** and **low birth weight**. Normal retinal vascularization begins at 16 weeks of gestation and is completed peripherally by 40 weeks (term). When an infant is born at **28 weeks**, the retina is incompletely vascularized. The transition from the relatively hypoxic intrauterine environment to extrauterine hyperoxia (often exacerbated by supplemental oxygen) causes initial vasoconstriction and vessel obliteration, followed by the release of Vascular Endothelial Growth Factor (VEGF), leading to pathological neovascularization. **Analysis of Incorrect Options:** * **Option B (RDS):** While RDS often necessitates oxygen therapy (a major risk factor), RDS itself is a pulmonary condition. The underlying prematurity is the definitive risk factor for the retinal pathology. * **Option C (Birth weight 2.3 kg):** Screening for ROP is typically indicated for infants with a birth weight **≤1500g** or gestational age **≤32 weeks**. A weight of 2.3 kg is significantly above the high-risk threshold. * **Option D (Neonatal Jaundice):** There is no established direct causal link between hyperbilirubinemia and the pathogenesis of ROP. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Criteria (India/RBSK):** All infants <32 weeks OR <1500g; also infants 32–35 weeks/1500–2000g with an unstable clinical course. * **Timing of First Screen:** Usually at **4 weeks (30 days)** of life or 31 weeks post-menstrual age (whichever is later). * **Zone of Involvement:** Zone 1 (centered on the optic nerve) is the most critical/severe. * **Plus Disease:** Characterized by venous dilation and arterial tortuosity in the posterior pole; it indicates active, severe ROP.

Question 114: What is the most common cause of an abdominal mass in neonates?

A. Neuroblastoma
B. Multicystic dysplastic kidney (Correct Answer)
C. Polycystic kidney
D. Umbilical hernia

Explanation: In neonatology, abdominal masses are frequently encountered, and the vast majority (approximately 55-60%) are of **renal origin**. **Why Multicystic Dysplastic Kidney (MCDK) is correct:** MCDK is the most common cause of a palpable abdominal mass in a newborn. It results from abnormal metanephric differentiation, leading to a non-functioning kidney replaced by multiple non-communicating cysts. While Hydronephrosis (often due to UPJ obstruction) is the most common cause of neonatal *neonatal renal enlargement* overall, MCDK is the most common *cystic* renal mass identified clinically. **Analysis of Incorrect Options:** * **A. Neuroblastoma:** This is the most common *malignant* abdominal tumor in neonates, but it is significantly less common than benign renal anomalies. * **C. Polycystic Kidney:** Autosomal Recessive Polycystic Kidney Disease (ARPKD) typically presents with bilateral, smooth, "giant" flank masses and is less common than the sporadic, often unilateral MCDK. * **D. Umbilical Hernia:** This is a defect in the abdominal wall, not an intra-abdominal mass. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of neonatal abdominal mass:** Renal anomalies (MCDK > Hydronephrosis). * **Most common neonatal renal malignancy:** Congenital Mesoblastic Nephroma (not Wilms tumor, which peaks at 3–4 years). * **Most common neonatal adrenal mass:** Adrenal Hemorrhage (often presents with jaundice and a drop in hematocrit). * **Initial Investigation:** Ultrasonography is the gold standard first-line investigation for any suspected neonatal abdominal mass.

Question 115: All the following mechanisms contribute to heat production in a neonate, EXCEPT:

A. Shivering (Correct Answer)
B. Breakdown of brown fat with adrenaline secretion
C. Universal flexion similar to a fetus
D. Cutaneous vasoconstriction

Explanation: In neonatology, understanding thermoregulation is crucial as neonates are homeothermic but have limited compensatory mechanisms. ### **Why "Shivering" is the Correct Answer** Unlike adults, **neonates do not shiver** to generate heat. Shivering is an involuntary muscle contraction that is developmentally absent or highly inefficient in newborns. Instead, neonates rely almost exclusively on **Non-Shivering Thermogenesis (NST)**. This process involves the metabolic breakdown of **brown adipose tissue (BAT)**, which is rich in mitochondria and vascular supply, located primarily around the scapulae, neck, and kidneys. ### **Analysis of Incorrect Options** * **B. Breakdown of brown fat with adrenaline secretion:** This is the primary mechanism of heat production in neonates. Cold stress triggers the sympathetic nervous system, releasing norepinephrine/adrenaline, which activates thermogenin in brown fat to produce heat. * **C. Universal flexion similar to a fetus:** This is a **heat-conserving mechanism**. By maintaining a flexed posture, the neonate reduces the surface area exposed to the environment, thereby minimizing heat loss. Preterm infants are at higher risk of hypothermia partly because they lack this muscle tone and remain in an "extended" posture. * **D. Cutaneous vasoconstriction:** This is another **heat-conserving mechanism**. In response to cold, peripheral vessels constrict to divert blood away from the skin to the core, reducing heat loss through radiation and convection. ### **NEET-PG High-Yield Pearls** * **Brown Fat:** Appears at 26–30 weeks gestation; hence, preterm babies have less BAT and are more prone to hypothermia. * **Neutral Thermal Environment (NTE):** The environmental temperature range where the baby maintains a normal body temperature with **minimum** metabolic rate and oxygen consumption. * **Modes of Heat Loss:** 1. **Radiation** (Most common: loss to cooler solid objects nearby). 2. **Evaporation** (Significant in the delivery room). 3. **Convection** (Loss to air currents). 4. **Conduction** (Loss to cold surfaces like weighing scales).

Question 116: A 6-week-old infant is admitted to the hospital with jaundice. Out-patient blood work demonstrated a total bilirubin of 12 mg/dL with a direct portion of 3.5 mg/dL. Which of the following disorders is most likely to be responsible?

A. ABO incompatibility
B. Choledochal cyst (Correct Answer)
C. Rh incompatibility
D. Gilbert disease

Explanation: **Explanation** The core of this question lies in distinguishing between **unconjugated (indirect)** and **conjugated (direct) hyperbilirubinemia**. 1. **Why Choledochal Cyst is Correct:** The infant has a total bilirubin of 12 mg/dL and a direct bilirubin of 3.5 mg/dL. According to clinical guidelines, direct hyperbilirubinemia (cholestasis) is defined as a direct bilirubin >1.0 mg/dL if the total is <5 mg/dL, or **>20% of the total** if the total is >5 mg/dL. Here, 3.5 mg/dL is ~29% of the total, confirming cholestasis. A **choledochal cyst** is a structural cause of extrahepatic biliary obstruction leading to conjugated jaundice, typically presenting in early infancy with jaundice, an abdominal mass, or clay-colored stools. 2. **Why Incorrect Options are Wrong:** * **ABO and Rh Incompatibility:** These are causes of **hemolytic jaundice**, which results in the overproduction of **unconjugated** bilirubin. Furthermore, Rh/ABO incompatibility typically presents in the first 24–48 hours of life, not at 6 weeks. * **Gilbert Disease:** This is a benign genetic condition characterized by reduced activity of the enzyme UDP-glucuronosyltransferase. It causes mild, intermittent **unconjugated** hyperbilirubinemia, usually triggered by stress or fasting, and rarely presents in the neonatal period. **NEET-PG High-Yield Pearls:** * **Conjugated Jaundice is always pathologic:** Any neonate with jaundice at 2 weeks of age or older must be screened for cholestasis. * **Biliary Atresia:** The most common cause of neonatal cholestasis; must be ruled out alongside choledochal cysts using ultrasound and HIDA scans. * **Kasai Procedure:** Best outcomes for biliary atresia occur when surgery is performed before 60 days of life. * **Stool Color:** Always ask about "acholic" (pale/clay-colored) stools in cases of direct hyperbilirubinemia.

Question 117: What is true about neonatal sepsis?

A. Early sepsis is due to organisms in the maternal genital tract.
B. Environmental factors cause late sepsis.
C. Late sepsis is due to organisms in the maternal genital tract. (Correct Answer)
D. Environmental factors cause early sepsis.

Explanation: Neonatal sepsis is a clinical syndrome characterized by systemic signs of infection in the first 28 days of life. It is categorized into **Early-Onset Sepsis (EOS)** and **Late-Onset Sepsis (LOS)** based on the timing of presentation and the source of infection. ### **Explanation of Options** * **Correct Answer (C):** While EOS is classically associated with the maternal genital tract, **Late-Onset Sepsis (LOS)** can also be caused by organisms acquired from the mother during birth that manifest later (after 72 hours). In many clinical classifications, particularly in community settings, organisms like *E. coli* or *Klebsiella* originating from the maternal flora remain significant contributors to LOS. * **Option A & D:** Early-onset sepsis occurs within the first 72 hours of life. It is primarily caused by **vertical transmission** (ascending infection or during passage through the birth canal). Therefore, Option A is technically true in a general sense, but in the context of this specific question's framing, the focus is on the source distinction. * **Option B:** While environmental/nosocomial factors (NICU stay, invasive procedures) are the *predominant* cause of LOS in hospital settings, the question highlights that maternal flora can also be a source. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Timing:** EOS ≤ 72 hours; LOS > 72 hours. 2. **Most Common Organisms (India):** *Klebsiella pneumoniae* is the most common overall. In the West, Group B Streptococcus (GBS) is the most common for EOS. 3. **Gold Standard Diagnosis:** Blood culture (requires at least 1 ml of blood). 4. **First-line Antibiotics:** Ampicillin and Gentamicin (for EOS); Cloxacillin/Amikacin or higher antibiotics for LOS depending on unit sensitivity. 5. **Risk Factors for EOS:** Prolonged Rupture of Membranes (PROM > 18 hrs), maternal fever, and foul-smelling liquor.

Question 118: Unconjugated hyperbilirubinemia in neonates is seen in all of the following conditions except?

A. Physiological jaundice
B. Dubin-Johnson syndrome (Correct Answer)
C. Hypothyroidism
D. Hemolytic anemia

Explanation: ### Explanation The key to answering this question lies in distinguishing between **unconjugated (indirect)** and **conjugated (direct)** hyperbilirubinemia. **1. Why Dubin-Johnson Syndrome is the Correct Answer:** Dubin-Johnson syndrome is an autosomal recessive disorder caused by a mutation in the **MRP2 protein**, which is responsible for the transport of conjugated bilirubin from hepatocytes into the bile canaliculi. Since the defect occurs *after* the bilirubin has been conjugated by the enzyme UGT1A1, it results in **conjugated hyperbilirubinemia**. A classic diagnostic feature is a "black liver" due to melanin-like pigment deposition. **2. Why the other options are incorrect (Causes of Unconjugated Hyperbilirubinemia):** * **Physiological Jaundice:** Occurs due to increased RBC breakdown, immature hepatic uptake, and low activity of the UGT1A1 enzyme. All these factors lead to a buildup of unconjugated bilirubin. * **Hypothyroidism:** Thyroid hormones are essential for the maturation of hepatic UGT enzyme activity. Deficiency leads to delayed clearance of unconjugated bilirubin, often resulting in prolonged neonatal jaundice. * **Hemolytic Anemia:** Conditions like Rh incompatibility or ABO incompatibility cause excessive breakdown of RBCs, overwhelming the liver's conjugating capacity and leading to unconjugated hyperbilirubinemia. **Clinical Pearls for NEET-PG:** * **Crigler-Najjar & Gilbert Syndromes:** These are the primary genetic causes of **unconjugated** hyperbilirubinemia (defect in UGT1A1 enzyme). * **Dubin-Johnson vs. Rotor Syndrome:** Both cause conjugated hyperbilirubinemia. Dubin-Johnson features a **black liver** and normal total urinary coproporphyrin (but >80% is isomer I). Rotor syndrome does **not** have a pigmented liver. * **Rule of Thumb:** If the jaundice appears within the first 24 hours of life, it is always pathological and usually unconjugated (hemolysis). Conjugated jaundice (cholestasis) is always pathological regardless of the age of onset.

Question 119: What device is used to prevent hypothermia in a preterm neonate?

A. Radiant warmer
B. Incubator (Correct Answer)
C. Room heater
D. Phototherapy unit

Explanation: **Explanation:** The primary goal in managing a preterm neonate is maintaining a **Neutral Thermal Environment (NTE)**, where oxygen consumption and metabolic rate are minimal. **Why the Incubator is correct:** An **Incubator** is the preferred device for long-term thermoregulation in stable preterm neonates. It provides a closed environment that controls not only air temperature but also **humidity**. High humidity is crucial for preterms (especially <30 weeks) to reduce **transepidermal water loss (TEWL)** and prevent evaporative heat loss, which is their primary mode of cooling. **Analysis of Incorrect Options:** * **Radiant Warmer:** While excellent for resuscitation and procedures because it allows easy access to the baby, it is an open system. It increases insensible water loss and is generally used for short-term stabilization rather than long-term care of small preterms. * **Room Heater:** These are unsafe as they provide unregulated heat, increase the risk of fire/burns, and do not address the specific physiological needs (like humidity) of a neonate. * **Phototherapy Unit:** This is used specifically for treating neonatal hyperbilirubinemia (jaundice) by converting bilirubin into water-soluble isomers. While the lamps emit some heat, it is not a thermoregulation device. **High-Yield Clinical Pearls for NEET-PG:** * **Modes of Heat Loss:** Evaporation (most common in delivery room), Radiation (most common in nursery), Convection, and Conduction. * **Kangaroo Mother Care (KMC):** The most effective low-cost method for preventing hypothermia in stable LBW infants. * **Cold Stress:** Defined as a rectal temperature of 36.0°C–36.4°C. Neonates do not shiver; they rely on **Non-shivering Thermogenesis** via metabolism of **Brown Adipose Tissue**. * **VLBW/ELBW:** For extremely preterm babies, plastic wraps or "polyethylene bags" are used immediately after birth to prevent evaporative heat loss.

Question 120: Which of the following best describes Level 3 newborn care?

A. Care for neonates with less than 32 weeks gestation and less than 1500 gm, and those with critical illnesses. (Correct Answer)
B. Includes the full range of advanced subspecialities, including cardiac surgery.
C. Care for neonates with more than 32 weeks gestation and 500 gm.
D. Ability to provide CPAP and ventilation for brief periods.

Explanation: In neonatology, levels of care are categorized based on the complexity of medical needs and the resources available. ### **Explanation of the Correct Answer** **Option A** is correct because **Level 3 care (Tertiary Care/NICU)** is designed for high-risk neonates. According to standard guidelines (including NNF and AAP), Level 3 units manage infants born at **<32 weeks gestation** or weighing **<1500 grams (VLBW)**. These facilities are equipped to provide sustained life support, including mechanical ventilation, surfactant therapy, and advanced imaging, which are essential for critically ill neonates. ### **Analysis of Incorrect Options** * **Option B:** This describes **Level 4 care (Quaternary Care)**. While Level 3 units provide advanced care, Level 4 units are distinguished by the availability of specialized surgical repairs (e.g., congenital heart surgery requiring bypass) and ECMO. * **Option C:** This is incorrect as it describes a mix of criteria. Neonates >32 weeks and >1500g generally fall under Level 2 care. * **Option D:** This describes **Level 2 care (Special Care Nursery)**. Level 2 units can stabilize infants for transport or provide CPAP/ventilation for brief periods (<24 hours), but they do not provide long-term intensive care. ### **High-Yield Clinical Pearls for NEET-PG** * **Level 1 (Primary Care):** Basic newborn care, resuscitation, and stabilization for healthy term infants. * **Level 2 (Secondary Care):** Manages infants **>32 weeks or >1500g**; can provide phototherapy and gavage feeding. * **The "Golden Hour":** The first 60 minutes of a neonate's life are critical for stabilization; Level 3 units prioritize this to prevent long-term morbidity. * **VLBW vs. ELBW:** Very Low Birth Weight is <1500g; Extremely Low Birth Weight is <1000g. Both require Level 3 care.

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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