Neonatology — MCQs

Neonatology Indian Medical PG Practice Questions and MCQs

Question 191: Bag and mask ventilation is absolutely contraindicated in which of the following conditions?

A. Tracheo-esophageal fistula with esophageal atresia and esophagus connected to the trachea
B. Diaphragmatic hernia
C. Meconium aspiration
D. All of the above (Correct Answer)

Explanation: **Explanation:** Bag and Mask Ventilation (BMV) is generally the first step in neonatal resuscitation; however, it is strictly contraindicated in conditions where positive pressure can worsen the underlying pathology by forcing air into the gastrointestinal tract or distal airways. **1. Diaphragmatic Hernia (CDH):** This is the most classic contraindication. BMV forces air into the stomach and intestines, which are located in the thoracic cavity. This causes bowel distension, further compressing the lungs and shifting the mediastinum, leading to severe respiratory compromise and potential pneumothorax. Immediate endotracheal intubation is required. **2. Tracheo-esophageal Fistula (TEF) with distal communication:** In the most common type (Type C), the trachea is connected to the distal esophagus. BMV forces air through the fistula into the stomach. This leads to gastric overdistension, which elevates the diaphragm (restricting lung expansion) and increases the risk of life-threatening gastric perforation or aspiration of gastric acid into the lungs. **3. Meconium Aspiration Syndrome (MAS):** While not an "absolute" contraindication in all resuscitation guidelines, BMV is avoided if the airway is obstructed by thick meconium. Forcing air against meconium plugs can push them deeper into the distal bronchioles (the "ball-valve" effect), increasing the risk of air trapping and pneumothorax. **Clinical Pearls for NEET-PG:** * **Management of CDH:** If a scaphoid abdomen and respiratory distress are noted at birth, **intubate immediately**; avoid BMV. * **Apgar Score:** BMV is indicated if the heart rate is <100 bpm or the infant is gasping/apneic, *unless* the above contraindications exist. * **Pressure Limit:** During neonatal BMV, the initial peak inspiratory pressure (PIP) should be 20–25 cm H₂O.

Question 192: Very low birth weight is defined as a birth weight of less than:

A. <1000g
B. <1500g (Correct Answer)
C. <2000g
D. <2500g

Explanation: **Explanation:** The classification of birth weight is a fundamental concept in neonatology, used to predict neonatal morbidity and mortality. The correct answer is **<1500g** because, according to the World Health Organization (WHO) and standard pediatric guidelines, **Very Low Birth Weight (VLBW)** is defined as any infant born weighing less than 1500 grams, regardless of gestational age. **Analysis of Options:** * **Option A (<1000g):** This defines **Extremely Low Birth Weight (ELBW)**. These infants are at the highest risk for complications like surfactant deficiency and intraventricular hemorrhage. * **Option C (<2000g):** There is no specific WHO nomenclature for <2000g; however, infants between 1500g and 2499g are simply categorized under the broad "Low Birth Weight" umbrella. * **Option D (<2500g):** This defines **Low Birth Weight (LBW)**. It is the most inclusive category and includes VLBW and ELBW infants. **High-Yield Facts for NEET-PG:** * **Normal Birth Weight:** 2500g to 3999g. * **Macrosomia:** Birth weight ≥4000g (often associated with maternal diabetes). * **Small for Gestational Age (SGA):** Weight below the 10th percentile for a specific gestational age. * **Clinical Pearl:** In India, the average birth weight is approximately 2.7–2.8 kg. LBW is a major contributor to the Neonatal Mortality Rate (NMR). Always distinguish between "preterm" (based on weeks) and "LBW" (based on weight), as an infant can be both.

Question 193: A newborn weighing 1000 g is born at 30 weeks gestational age with respiratory distress within 1 hour of birth. All of the following are diagnostic possibilities EXCEPT?

A. Diaphragmatic hernia
B. Hyaline membrane disease
C. Bronchopulmonary dysplasia (Correct Answer)
D. Pulmonary hemorrhage

Explanation: **Explanation:** The core concept in this question is the **timing of clinical presentation**. The infant is presenting with respiratory distress within **one hour of birth**, which indicates an acute, early-onset condition. **Why Bronchopulmonary Dysplasia (BPD) is the correct answer:** BPD is a **chronic lung disease** of prematurity. By definition, it is diagnosed in infants who require supplemental oxygen for at least 28 days or beyond 36 weeks of postmenstrual age. It is a sequela of neonatal respiratory distress and its management (oxygen toxicity, barotrauma), not a cause of distress in the immediate postnatal period. Therefore, it cannot be a diagnostic possibility within the first hour of life. **Analysis of incorrect options:** * **Hyaline Membrane Disease (HMD/RDS):** This is the most common cause of distress in a 30-week preterm infant (1000g) due to surfactant deficiency. It typically presents within minutes to a few hours after birth. * **Diaphragmatic Hernia:** This is a structural anomaly that presents with immediate respiratory distress, a scaphoid abdomen, and shifted heart sounds at birth. * **Pulmonary Hemorrhage:** Often seen in very low birth weight (VLBW) infants, it can occur early, especially in the context of severe RDS or a large patent ductus arteriosus (PDA). **NEET-PG High-Yield Pearls:** * **HMD X-ray:** Characterized by a "Ground Glass" appearance and air bronchograms. * **BPD Definition:** Oxygen requirement at 28 days of life (Northway criteria) or 36 weeks PMA (NIH criteria). * **Surfactant:** Produced by Type II pneumocytes; the L/S ratio > 2 indicates lung maturity. * **Immediate distress + Scaphoid abdomen:** Always suspect Congenital Diaphragmatic Hernia (CDH). Bag and mask ventilation is contraindicated in CDH.

Question 194: During neonatal resuscitation, when should chest compressions be started, and what is the ideal ratio of chest compressions to ventilation?

A. Heart rate less than 60 beats/min; 30:2
B. Heart rate less than 100 beats/min; 2:1
C. Heart rate less than 100 beats/min; 15:1
D. Heart rate less than 60 beats/min; 3:1 (Correct Answer)

Explanation: **Explanation:** The management of neonatal resuscitation follows the **NRP (Neonatal Resuscitation Program)** guidelines. The primary goal in neonatal resuscitation is establishing effective ventilation, as most neonatal depression is respiratory in origin. **1. Why Option D is Correct:** Chest compressions are indicated only when the **heart rate (HR) remains below 60 beats per minute** despite at least 30 seconds of effective positive-pressure ventilation (PPV) that inflates the lungs. The recommended compression-to-ventilation ratio is **3:1** (90 compressions and 30 breaths per minute, totaling 120 events per minute). This ratio ensures adequate minute ventilation while providing circulatory support, reflecting the respiratory nature of neonatal arrest. **2. Why Other Options are Incorrect:** * **Options B & C:** A heart rate of **less than 100 bpm** is the threshold for starting **Positive Pressure Ventilation (PPV)**, not chest compressions. Starting compressions at this rate is premature. * **Option A:** While the HR threshold (<60) is correct, the **30:2** ratio is used in adult/child CPR (single rescuer) or Basic Life Support (BLS). In the neonatal setting, the 3:1 ratio is prioritized to maintain a higher respiratory rate. * **Note on 15:2:** This ratio is used for two-rescuer CPR in infants and children, but **not** in the neonatal period (unless the arrest is of known cardiac origin). **High-Yield Clinical Pearls for NEET-PG:** * **Depth:** Compressions should depress the lower third of the sternum by approximately **one-third** of the anterior-posterior diameter of the chest. * **Technique:** The **two-thumb technique** is preferred over the two-finger technique as it generates higher coronary perfusion pressure. * **Oxygen:** Once compressions begin, the FiO2 should be increased to **100%**. * **Reassessment:** Check the heart rate every **60 seconds** during compressions (preferably using ECG).

Question 195: A post-term neonate is defined as a neonate born after how many weeks of gestation?

A. 38
B. 40
C. 42 (Correct Answer)
D. 44

Explanation: **Explanation:** The classification of neonates based on gestational age is a fundamental concept in neonatology, standardized by the WHO and AAP. **Why Option C is Correct:** A **post-term neonate** is defined as an infant born at or beyond **42 completed weeks** (≥294 days) of gestation, calculated from the first day of the mother's last menstrual period (LMP). These infants are at a higher risk for **Post-maturity Syndrome**, characterized by loss of subcutaneous fat, wrinkled skin, and meconium staining. **Analysis of Incorrect Options:** * **Option A (38 weeks):** This falls within the **Full-term** category. According to current classifications, 37 0/7 to 38 6/7 weeks is specifically termed "Early Term." * **Option B (40 weeks):** This is the average expected date of delivery (EDD). A neonate born at 40 weeks is considered "Full Term" (specifically 39 0/7 to 40 6/7 weeks). * **Option D (44 weeks):** While 44 weeks is technically post-term, the clinical definition and threshold for diagnosis begin at the completion of the 42nd week. **High-Yield Clinical Pearls for NEET-PG:** * **Preterm:** Born before 37 completed weeks (<259 days). * **Term:** 37 to 42 weeks. * *Early Term:* 37 0/7 – 38 6/7 weeks. * *Full Term:* 39 0/7 – 40 6/7 weeks. * *Late Term:* 41 0/7 – 41 6/7 weeks. * **Post-term:** ≥42 weeks. * **Key Risk:** The most significant complication in post-term neonates is **Meconium Aspiration Syndrome (MAS)** due to placental insufficiency and fetal hypoxia. * **Clifford’s Syndrome:** Another name for post-maturity syndrome, featuring "parchment-like" peeling skin and long nails.

Question 196: A 32-week, 1400 g neonate is born to a primigravida. The baby did not require resuscitation and showed stable vitals. The baby was transferred to the NICU. How will you manage the feeding of this patient?

A. Start total enteral feeding; IV feeding is not required. (Correct Answer)
B. Start IV feeding with minimal enteral feeding.
C. Start IV feeding and introduce enteral feeding on the 2nd day of life.
D. Start parenteral feeding and institute oral feeding on the 2nd day of life.

Explanation: ### Explanation The management of feeding in a preterm neonate depends on the **gestational age, birth weight, and clinical stability**. **1. Why Option A is Correct:** According to standard neonatology protocols (including AIIMS and NNF guidelines), stable neonates born at **≥32 weeks** of gestation with a birth weight of **≥1200–1500 g** can usually tolerate **total enteral nutrition** from the first day of life. Since this neonate is 32 weeks, weighs 1400 g, and is hemodynamically stable (no resuscitation required, stable vitals), there is no contraindication to starting full enteral feeds (preferably via orogastric tube or paladai/spoon). Intravenous (IV) fluids are generally not required if the baby can meet their fluid and caloric requirements enterally. **2. Why Other Options are Incorrect:** * **Options B, C, and D:** These options suggest starting IV or parenteral feeding. IV fluids/Parenteral nutrition are typically reserved for babies **<32 weeks**, those weighing **<1200–1500 g**, or those who are **clinically unstable** (e.g., respiratory distress, sepsis, or birth asphyxia). Delaying enteral feeding (as suggested in C and D) unnecessarily increases the risk of catheter-related infections and delays gut maturation. **3. Clinical Pearls for NEET-PG:** * **Trophic Feeding (Minimal Enteral Nutrition):** Starting small volumes (10–15 ml/kg/day) of milk to "prime" the gut without expecting nutritional weight gain. Indicated in very low birth weight (VLBW) infants who are not yet ready for full feeds. * **Feeding Methods by Gestation:** * **<28 weeks:** Total Parenteral Nutrition (TPN). * **28–32 weeks:** Orogastric/Nasogastric tube feeding. * **32–34 weeks:** Paladai or spoon feeding. * **>34 weeks:** Direct breastfeeding. * **Choice of Milk:** Expressed Breast Milk (EBM) is the gold standard to prevent Necrotizing Enterocolitis (NEC).

Question 197: Neonate with retrolental fibroplasia is associated with which of the following?

A. Hypoxia
B. Hypocapnea
C. Hypoxemia
D. Hyperoxemia (Correct Answer)

Explanation: **Explanation:** **Retrolental Fibroplasia (RLF)**, now more commonly known as **Retinopathy of Prematurity (ROP)**, is a vasoproliferative disorder affecting the developing retina of preterm infants. **Why Hyperoxemia is the Correct Answer:** The primary pathophysiology involves the exposure of an immature retina to high concentrations of supplemental oxygen (**Hyperoxemia**). In utero, the retina develops in a relatively hypoxic environment. When a preterm neonate is exposed to excessive oxygen, it causes: 1. **Vasoconstriction** and injury to the developing retinal capillaries (Vaso-obliteration). 2. A subsequent compensatory release of **VEGF** (Vascular Endothelial Growth Factor) when the infant is returned to room air. 3. This leads to **neovascularization** (abnormal vessel growth), which can cause scarring, traction, and eventual retinal detachment (the "retrolental" membrane). **Analysis of Incorrect Options:** * **Hypoxia/Hypoxemia (A & C):** While fluctuations in oxygen levels (hypoxia-hyperoxia cycles) can worsen ROP, the classic inciting factor for RLF is the toxicity of *excess* oxygen. Hypoxia itself does not trigger the initial vaso-obliterative phase. * **Hypocapnea (B):** Low carbon dioxide levels can cause cerebral vasoconstriction, but it is not the primary physiological driver for the fibroplastic changes seen in the retina. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Low birth weight (<1500g), low gestational age (<32 weeks), and prolonged supplemental oxygen. * **Screening Criteria:** All infants born **<30 weeks** gestation or **<1500g** birth weight must be screened. * **First Screening:** Should be performed at **4 weeks** of postnatal age or **31 weeks** of post-menstrual age (whichever is later). * **Zone I Involvement:** This is the most severe form as it involves the area around the optic nerve and macula. * **Plus Disease:** Characterized by venous dilation and arterial tortuosity in the posterior pole; it indicates active, severe ROP.

Question 198: Respiratory distress syndrome in the newborn is commonly associated with which of the following conditions, except?

A. Diabetic pregnancy
B. Prematurity
C. Following an elective cesarean section
D. Intrauterine growth retardation (Correct Answer)

Explanation: **Explanation:** Respiratory Distress Syndrome (RDS), also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant. The production of surfactant is influenced by hormonal levels and gestational age. **Why Intrauterine Growth Retardation (IUGR) is the correct answer:** IUGR acts as a chronic intrauterine stressor. Chronic stress triggers the premature release of endogenous maternal and fetal **corticosteroids**. These steroids accelerate lung maturation and surfactant production. Consequently, IUGR is considered a **protective factor** against RDS, making it the correct "except" choice. **Analysis of Incorrect Options:** * **Prematurity (Option B):** This is the single most important risk factor. Surfactant synthesis by Type II pneumocytes begins around 24–28 weeks and reaches maturity after 35 weeks. * **Diabetic Pregnancy (Option A):** Hyperinsulinemia in the fetus (secondary to maternal hyperglycemia) antagonizes the action of cortisol. Insulin inhibits the expression of surfactant proteins, specifically SP-A and SP-B, thereby increasing RDS risk even in near-term infants. * **Elective Cesarean Section (Option C):** The "labor squeeze" and the natural surge of catecholamines and glucocorticoids during vaginal delivery help clear fetal lung fluid and stimulate surfactant release. Elective C-sections bypass this process, increasing the risk of RDS and Transient Tachypnea of the Newborn (TTN). **NEET-PG High-Yield Pearls:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **>2:1** indicates lung maturity. * **Best Predictor:** The presence of **Phosphatidylglycerol** in amniotic fluid is the most reliable indicator of lung maturity, especially in diabetic pregnancies. * **Ground Glass Appearance:** The classic radiological finding in RDS is a diffuse reticulogranular pattern with air bronchograms. * **Antenatal Steroids:** Dexamethasone or Betamethasone given to the mother 24–48 hours before delivery significantly reduces RDS incidence.

Question 199: Stroke bite lesions are seen in which of the following conditions?

A. Sturge-Weber syndrome
B. Blue rubber bleb nevus syndrome
C. Macular staining of infant (Correct Answer)
D. Craniofacial nevus

Explanation: **Explanation:** **Macular staining of the infant** (Option C), also known as **Nevus Simplex**, is the most common vascular lesion in neonates. These are capillary malformations characterized by pale pink, maculopapular lesions. They are colloquially named based on their location: * **"Stork bite":** When located on the nape of the neck. * **"Angel kiss":** When located on the eyelids or glabella. These lesions are benign, blanch on pressure, and typically fade within the first year of life (except for nuchal lesions, which may persist). **Why other options are incorrect:** * **Sturge-Weber Syndrome (A):** Associated with a **Port-wine stain** (Nevus Flammeus). Unlike stork bites, these are usually unilateral, follow the trigeminal nerve distribution, do not cross the midline, and do not fade with age. * **Blue Rubber Bleb Nevus Syndrome (B):** A rare condition characterized by multiple cutaneous and gastrointestinal venous malformations (hemangiomas) that appear as bluish, rubbery blebs. * **Craniofacial Nevus (D):** A general term often used to describe larger melanocytic nevi or port-wine stains, but it is not the specific clinical term for the transient macular stains seen in newborns. **High-Yield Clinical Pearls for NEET-PG:** * **Nevus Simplex (Stork bite):** Most common; transient; fades spontaneously. * **Nevus Flammeus (Port-wine stain):** Permanent; grows with the child; associated with Sturge-Weber syndrome (glaucoma, seizures, tram-track calcifications). * **Salmon Patch:** Another synonym for Nevus Simplex. * **Management:** Reassurance is the key, as no treatment is required for stork bites.

Question 200: Unconjugated hyperbilirubinemia is seen in all except?

A. Physiological jaundice
B. Breast milk jaundice
C. Gilbert syndrome
D. Biliary atresia (Correct Answer)

Explanation: **Explanation:** The core concept in this question is differentiating between **unconjugated (indirect)** and **conjugated (direct)** hyperbilirubinemia. **Why Biliary Atresia is the correct answer:** Biliary atresia is a structural condition characterized by the progressive destruction or absence of the extrahepatic biliary tree. This leads to an obstruction in bile flow, causing **conjugated hyperbilirubinemia** (cholestasis). In this condition, the liver can conjugate bilirubin, but it cannot excrete it into the intestine. Clinically, this presents with jaundice, acholic (clay-colored) stools, and dark urine. **Analysis of Incorrect Options (Causes of Unconjugated Hyperbilirubinemia):** * **Physiological Jaundice:** Caused by increased RBC breakdown and immature hepatic UGT enzyme activity. It is always unconjugated. * **Breast Milk Jaundice:** Occurs due to factors in breast milk (like beta-glucuronidase) that increase enterohepatic circulation of bilirubin. It is unconjugated. * **Gilbert Syndrome:** A genetic defect causing reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, leading to impaired conjugation and mild unconjugated hyperbilirubinemia. **NEET-PG High-Yield Pearls:** 1. **Rule of Thumb:** Any jaundice appearing within the first 24 hours of life or lasting beyond 2 weeks (prolonged jaundice) requires investigation for pathological causes. 2. **Biliary Atresia Diagnosis:** The "Gold Standard" for diagnosis is an **Intraoperative Cholangiogram (IOC)**. The initial screening test is often a HIDA scan (showing no excretion into the bowel). 3. **Treatment:** The surgical procedure of choice for Biliary Atresia is **Kasai Portoenterostomy**, ideally performed before 60 days of life for the best prognosis. 4. **Crigler-Najjar Syndrome:** Another high-yield cause of severe unconjugated hyperbilirubinemia due to total (Type I) or partial (Type II) absence of UGT enzyme.

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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