Neonatology — MCQs
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A 6-hour-old infant delivered with difficulty by low forceps exhibits an asymmetric Moro reflex involving the right arm. The infant is cyanotic and has labored respiration. The abdomen does not bulge with inspiration, and breath sounds are decreased in the right chest. What is the most likely diagnosis?
What are the essential components of neonatal resuscitation?
A 30-week gestation, 1.2 kg infant develops respiratory distress, grunting, and chest retractions within 2 hours of birth. His respiratory rate is 70/min. What is the MOST appropriate next step in management?
Unconjugated hyperbilirubinemia in a newborn can be caused by all the following EXCEPT:
What is the blood glucose level considered hyperglycemia in a neonate?
Ground glass appearance is not seen in which of the following conditions?
Jaundice in a newborn at birth or before 24 hours of life is most commonly due to which of the following?
Which of the following is best for the transport of a newborn while maintaining body temperature?
With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:
APGAR score is a measure of all except?
Neonatology Indian Medical PG Practice Questions and MCQs
Question 561: A 6-hour-old infant delivered with difficulty by low forceps exhibits an asymmetric Moro reflex involving the right arm. The infant is cyanotic and has labored respiration. The abdomen does not bulge with inspiration, and breath sounds are decreased in the right chest. What is the most likely diagnosis?
- A. Respiratory distress syndrome
- B. Meconium aspiration syndrome
- C. Ipsilateral paralysis of the diaphragm (Correct Answer)
- D. Tracheoesophageal fistula
Explanation: ### Explanation **Correct Answer: C. Ipsilateral paralysis of the diaphragm** The clinical presentation points toward a birth injury involving the **phrenic nerve (C3-C5)**. 1. **Mechanism of Injury:** Difficult deliveries (e.g., forceps, breech) can cause lateral traction on the neck, leading to **Erb’s palsy** (asymmetric Moro reflex) and associated phrenic nerve injury. 2. **Clinical Signs:** Paralysis of the diaphragm leads to **paradoxical breathing** (the abdomen sinks rather than bulges during inspiration). Decreased breath sounds and respiratory distress occur because the affected side of the diaphragm remains elevated, reducing lung expansion. --- ### Why the other options are incorrect: * **A. Respiratory Distress Syndrome (RDS):** Typically seen in preterm infants due to surfactant deficiency. It presents with symmetrical lung findings and diffuse "ground-glass" opacities on X-ray, not an asymmetric Moro reflex. * **B. Meconium Aspiration Syndrome (MAS):** Occurs in post-term or term infants with a history of meconium-stained liquor. While it causes respiratory distress, it does not explain the asymmetric Moro reflex or the lack of abdominal bulging. * **D. Tracheoesophageal Fistula (TEF):** Presents with excessive salivation, choking, and cyanosis during feeding. It does not correlate with birth trauma or focal neurological deficits like an asymmetric Moro reflex. --- ### NEET-PG Clinical Pearls: * **Phrenic Nerve Palsy:** Frequently associated with **Erb-Duchenne paralysis** (C5-C6) because they share the same nerve roots. * **Diagnosis:** The gold standard for diagnosis is **Ultrasonography** or **Fluoroscopy** (Sniff test), which shows paradoxical movement of the diaphragm. * **Management:** Most cases are managed conservatively with oxygen and positioning (affected side down); surgical plication is reserved for refractory cases. * **Asymmetric Moro Reflex:** Always look for three main causes in exams: Clavicle fracture, Brachial plexus injury, or Humerus fracture.
Question 562: What are the essential components of neonatal resuscitation?
- A. Maintenance of temperature
- B. Maintenance of respiration
- C. Maintenance of circulation
- D. All of the above (Correct Answer)
Explanation: Neonatal resuscitation follows a systematic approach designed to support the transition from intrauterine to extrauterine life. The correct answer is **D (All of the above)** because successful resuscitation relies on the "T-A-B-C" principle: **T**emperature, **A**irway, **B**reathing, and **C**irculation. ### Explanation of Components: 1. **Maintenance of Temperature (Option A):** This is the first step. Newborns, especially preterm infants, are highly susceptible to hypothermia due to a large surface-area-to-volume ratio. Hypothermia leads to metabolic acidosis, increased oxygen consumption, and hypoglycemia, which can impede resuscitation efforts. 2. **Maintenance of Respiration (Option B):** Most neonates require only basic stimulation or positive pressure ventilation (PPV) to initiate breathing. Establishing functional residual capacity (FRC) is the single most important step in neonatal resuscitation. 3. **Maintenance of Circulation (Option C):** If the heart rate remains below 60 bpm despite adequate ventilation, chest compressions and medications (Epinephrine) are initiated to maintain systemic perfusion. ### Why other options are incorrect: Options A, B, and C are individual pillars of the resuscitation algorithm. Selecting any single one would be incomplete, as the process is integrated; for example, you cannot effectively manage circulation if the airway is not secured or if the baby is profoundly hypothermic. ### High-Yield Clinical Pearls for NEET-PG: * **The Golden Minute:** The initial steps (T-A-B) and re-evaluation should be completed within the first 60 seconds of birth. * **Initial Assessment:** Based on three questions: Is the baby **Term**? Does the baby have good **Tone**? Is the baby **Breathing/Crying**? * **Most Important Step:** Effective **Ventilation** is the most critical component of successful neonatal resuscitation. * **Compression-to-Ventilation Ratio:** 3:1 (90 compressions and 30 breaths per minute).
Question 563: A 30-week gestation, 1.2 kg infant develops respiratory distress, grunting, and chest retractions within 2 hours of birth. His respiratory rate is 70/min. What is the MOST appropriate next step in management?
- A. Nasal CPAP (Correct Answer)
- B. Surfactant therapy plus mechanical ventilation
- C. Mechanical ventilation only
- D. Warm humidified oxygen through a hood mask
Explanation: ### Explanation **Correct Option: A. Nasal CPAP** The clinical presentation—preterm birth (30 weeks), low birth weight (1.2 kg), and early-onset respiratory distress (grunting, retractions, tachypnea)—is classic for **Respiratory Distress Syndrome (RDS)** due to surfactant deficiency. According to current guidelines (including AAP and European Consensus), **Nasal Continuous Positive Airway Pressure (nCPAP)** is the preferred initial management for preterm infants with RDS who are breathing spontaneously. CPAP provides positive end-expiratory pressure (PEEP), which prevents alveolar collapse (atelectasis), improves functional residual capacity, and reduces the "work of breathing," often eliminating the need for invasive ventilation. **Why other options are incorrect:** * **B & C (Mechanical Ventilation/Surfactant):** Invasive ventilation is reserved for infants who fail CPAP (e.g., persistent hypoxia or apnea). While surfactant is definitive treatment, the modern "CPAP-first" approach aims to avoid the lung injury associated with intubation. Surfactant is now often delivered via minimally invasive techniques (LISA/MIST) only if CPAP fails. * **D (Oxygen Hood):** While it provides oxygen, it does not provide the necessary pressure (PEEP) to keep the immature alveoli open. This leads to progressive atelectasis in RDS. --- ### High-Yield Clinical Pearls for NEET-PG * **Ground Glass Appearance:** The classic X-ray finding in RDS (diffuse reticulogranular opacities with air bronchograms). * **Silverman-Anderson Score:** Used to assess the severity of respiratory distress in neonates (Score >7 indicates severe distress). * **Antenatal Corticosteroids:** The most effective way to prevent RDS if preterm birth is anticipated. * **L/S Ratio:** An Amniotic fluid Lecithin/Sphingomyelin ratio **<2:1** indicates fetal lung immaturity. * **The "Golden Hour":** Early application of CPAP in the delivery room significantly reduces the incidence of Bronchopulmonary Dysplasia (BPD).
Question 564: Unconjugated hyperbilirubinemia in a newborn can be caused by all the following EXCEPT:
- A. Dubin Johnson syndrome (Correct Answer)
- B. Ineffective erythropoiesis
- C. Gilbert's syndrome
- D. Crigler-Najjar syndrome
Explanation: ### Explanation Hyperbilirubinemia in neonates is classified into **unconjugated (indirect)** and **conjugated (direct)** based on the site of the defect in bilirubin metabolism (pre-hepatic, hepatic, or post-hepatic). **1. Why Dubin-Johnson Syndrome is the Correct Answer:** Dubin-Johnson syndrome is an autosomal recessive disorder caused by a mutation in the **MRP2 gene**, which leads to a defect in the **excretion** of conjugated bilirubin from hepatocytes into the bile canaliculi. Since the bilirubin has already been processed by the liver enzyme UGT1A1, it results in **conjugated hyperbilirubinemia**. A classic diagnostic feature is a "black liver" due to melanin-like pigment deposition. **2. Analysis of Incorrect Options (Causes of Unconjugated Hyperbilirubinemia):** * **Ineffective Erythropoiesis:** This is a **pre-hepatic** cause. Increased breakdown of RBC precursors in the bone marrow leads to an overproduction of heme, which is converted into unconjugated bilirubin, overwhelming the liver's conjugating capacity. * **Gilbert’s Syndrome:** This is a **hepatic** cause involving a mild reduction (approx. 30% of normal) in the activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, leading to decreased conjugation. * **Crigler-Najjar Syndrome:** This involves a severe (Type II) or total (Type I) deficiency of **UGT1A1**, resulting in significant unconjugated hyperbilirubinemia and a high risk of kernicterus. **Clinical Pearls for NEET-PG:** * **Rotor Syndrome:** Similar to Dubin-Johnson (conjugated hyperbilirubinemia) but lacks the black liver pigment and has different urinary coproporphyrin excretion patterns. * **Phototherapy:** Only effective for **unconjugated** bilirubin (converts it to lumirubin). * **Bronze Baby Syndrome:** A complication seen when phototherapy is mistakenly applied to a neonate with **conjugated** hyperbilirubinemia.
Question 565: What is the blood glucose level considered hyperglycemia in a neonate?
- A. 150 mg/dL
- B. 125 mg/dL (Correct Answer)
- C. 180 mg/dL
- D. 100 mg/dL
Explanation: **Explanation:** In neonatology, **hyperglycemia** is defined as a whole blood glucose level **>125 mg/dL** or a plasma glucose level **>145–150 mg/dL**, regardless of the infant's gestational age or weight. The threshold of 125 mg/dL is clinically significant because it often exceeds the renal threshold for glucose in preterm neonates, leading to **osmotic diuresis**, dehydration, and an increased risk of intraventricular hemorrhage (IVH) due to rapid shifts in serum osmolality. **Analysis of Options:** * **Option B (125 mg/dL):** This is the standard diagnostic cutoff for whole blood glucose in neonates. It is a high-yield fact frequently tested in NEET-PG. * **Option A & C (150 mg/dL & 180 mg/dL):** While these values represent significant hyperglycemia and are often the thresholds for initiating medical intervention (like insulin or reducing glucose infusion rates), they are not the *defining* lower limit. 150 mg/dL is specifically the threshold for plasma glucose. * **Option D (100 mg/dL):** This is within the normal glycemic range for a stable neonate. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** Iatrogenic (excessive Glucose Infusion Rate - GIR) is the most common cause, especially in Very Low Birth Weight (VLBW) infants. 2. **Neonatal Diabetes:** Defined as hyperglycemia occurring within the first month of life lasting >2 weeks; it is most commonly transient. 3. **Management:** The first step is reducing the GIR. Insulin is reserved for persistent hyperglycemia (>200–250 mg/dL) despite GIR optimization. 4. **Hypoglycemia Refresher:** Remember that for NEET-PG, neonatal hypoglycemia is generally defined as <45 mg/dL.
Question 566: Ground glass appearance is not seen in which of the following conditions?
- A. Hyaline membrane disease
- B. Left to right shunts (Correct Answer)
- C. Pneumonia
- D. Obstructive TAPVC
Explanation: **Explanation:** The "Ground Glass Appearance" (GGA) on a chest X-ray represents a fine, granular opacification of the lung parenchyma where underlying pulmonary vessels are still visible. It typically signifies **alveolar collapse (atelectasis)** or **fluid/exudate** within the distal airspaces. **Why "Left to Right Shunts" is the correct answer:** In conditions like VSD, PDA, or ASD (Left-to-right shunts), there is increased pulmonary blood flow (**active hyperemia**). This manifests radiologically as **prominent pulmonary vascular markings** (plethora) and cardiomegaly, rather than the diffuse, hazy granularity of ground glass. **Analysis of Incorrect Options:** * **Hyaline Membrane Disease (HMD/RDS):** This is the classic cause of GGA. It occurs due to surfactant deficiency leading to widespread micro-atelectasis. The "granular" look is created by collapsed alveoli interspersed with dilated alveolar ducts. * **Pneumonia:** In neonates, especially Group B Streptococcus pneumonia, the radiological presentation can be indistinguishable from HMD, often showing diffuse GGA due to inflammatory exudates in the alveoli. * **Obstructive TAPVC (Total Anomalous Pulmonary Venous Connection):** This condition leads to severe **pulmonary venous congestion** and interstitial edema. The resulting fluid accumulation in the interstitium and alveoli produces a classic diffuse ground-glass pattern with a small heart. **NEET-PG High-Yield Pearls:** * **HMD Triad on X-ray:** Low lung volumes, diffuse ground-glass opacities, and prominent air bronchograms. * **Obstructive TAPVC:** Characterized by GGA with a **normal-sized heart**, unlike non-obstructive TAPVC which shows the "Snowman" or "Figure of 8" appearance. * **Transient Tachypnea of Newborn (TTN):** Shows "starburst" appearance or perihilar streaking, not typically classic GGA.
Question 567: Jaundice in a newborn at birth or before 24 hours of life is most commonly due to which of the following?
- A. Erythroblastosis fetalis
- B. Sepsis
- C. Rh incompatibility
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Jaundice appearing within the first 24 hours of life is **always pathological**. In clinical practice, the most common causes of early-onset neonatal jaundice are hemolytic diseases and intrauterine infections. 1. **Erythroblastosis Fetalis:** This is a severe form of hemolytic disease of the newborn (HDN) caused by maternal-fetal blood group incompatibility (Rh or ABO). It leads to massive destruction of fetal red blood cells, resulting in high levels of unconjugated bilirubin present immediately at birth. 2. **Rh Incompatibility:** Specifically, Rh isoimmunization is a classic cause of jaundice within 24 hours. While ABO incompatibility is more common, Rh incompatibility often presents with more severe, early-onset jaundice and anemia. 3. **Sepsis:** Intrauterine or early-onset neonatal sepsis (e.g., *Group B Streptococcus*, *E. coli*) can cause jaundice through multiple mechanisms, including hemolysis, liver dysfunction, and cholestasis. **Why "All of the above" is correct:** All three conditions listed are primary differentials for jaundice occurring in the first 24 hours. While Rh incompatibility is a specific type of Erythroblastosis fetalis, both are distinct clinical terms used in exams to describe early hemolytic jaundice. Sepsis must always be ruled out in any neonate with early jaundice. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Jaundice in the first 24 hours is pathological until proven otherwise. * **Other Causes:** G6PD deficiency, Crigler-Najjar syndrome, and intrauterine infections (TORCH). * **Kramer’s Rule:** Used to clinically estimate bilirubin levels based on the cephalocaudal progression of jaundice. * **Treatment:** The immediate goal is to prevent **Kernicterus** (bilirubin encephalopathy) using phototherapy or exchange transfusion.
Question 568: Which of the following is best for the transport of a newborn while maintaining body temperature?
- A. Kangaroo Mother Care (KMC) (Correct Answer)
- B. Transport incubator
- C. Thermacol box
- D. Hot water bottle
Explanation: **Explanation:** The primary goal of neonatal transport is to maintain the "warm chain" to prevent neonatal cold stress and hypoglycemia. **Why Kangaroo Mother Care (KMC) is the Correct Answer:** KMC is considered the **gold standard** for transporting stable low-birth-weight (LBW) newborns, especially in resource-limited settings. It utilizes **skin-to-skin contact**, where the mother’s body acts as a natural "active" heat source, providing continuous thermal regulation. Unlike mechanical devices, KMC also facilitates breastfeeding, reduces transport-related stress, and provides sensory stimulation, making it the most effective and safest method for maintaining temperature during transit. **Analysis of Incorrect Options:** * **Transport Incubator:** While effective, these are expensive, require a continuous power supply, and are often bulky. They are generally reserved for unstable neonates requiring mechanical ventilation. * **Thermacol Box:** This is a "passive" insulation method. While it can reduce heat loss, it cannot generate heat. It is an outdated practice and inferior to the active warming provided by KMC. * **Hot Water Bottle:** This is **strictly contraindicated**. Newborn skin is extremely thin and poorly vascularized; hot water bottles pose a high risk of accidental contact burns and hyperthermia. **High-Yield Clinical Pearls for NEET-PG:** * **Neutral Thermal Environment (NTE):** The environmental temperature range where the baby maintains a normal body temperature with minimum metabolic rate and oxygen consumption. * **Components of KMC:** Skin-to-skin contact, exclusive breastfeeding, and early discharge. * **Transport Criteria:** Always stabilize the "ABC" (Airway, Breathing, Circulation) and ensure the baby is warm before initiating transport. KMC is the preferred method for stable babies <2500g.
Question 569: With reference to Respiratory Distress Syndrome (RDS), all of the following statements are true EXCEPT:
- A. Usually occurs in infants born before 34 weeks of gestation.
- B. Is more common in babies born to diabetic mothers.
- C. Leads to cyanosis.
- D. Is treated by administering 100% oxygen. (Correct Answer)
Explanation: ### Explanation **Respiratory Distress Syndrome (RDS)**, also known as Hyaline Membrane Disease, is primarily caused by a deficiency of pulmonary surfactant in preterm neonates. **Why Option D is the Correct Answer (The False Statement):** Administering **100% oxygen** is contraindicated in the management of RDS. High concentrations of supplemental oxygen in preterm neonates lead to the production of free radicals, causing oxidative stress. This significantly increases the risk of **Retinopathy of Prematurity (ROP)** and **Bronchopulmonary Dysplasia (BPD)**. The goal of treatment is to maintain oxygen saturation ($SpO_2$) between **91% and 95%** using the lowest possible fraction of inspired oxygen ($FiO_2$). **Analysis of Other Options:** * **Option A:** RDS is inversely proportional to gestational age. It most commonly affects infants born **before 34 weeks**, as surfactant production by Type II pneumocytes only reaches maturity after 35 weeks. * **Option B:** Infants of diabetic mothers (IDM) are at higher risk because **hyperinsulinemia** in the fetus antagonizes the action of cortisol, thereby delaying surfactant synthesis. * **Option C:** RDS leads to alveolar collapse (atelectasis), resulting in a ventilation-perfusion (V/Q) mismatch and right-to-left shunting, which clinically manifests as **cyanosis**. **NEET-PG High-Yield Pearls:** * **L/S Ratio:** A Lecithin/Sphingomyelin ratio of **>2:1** in amniotic fluid indicates lung maturity. * **Ground Glass Opacity:** The classic X-ray finding in RDS is a diffuse reticulogranular pattern with **air bronchograms**. * **Treatment of Choice:** Early application of **Nasal CPAP** and exogenous **Surfactant replacement therapy** (e.g., Poractant alfa) via the INSURE technique (Intubate-Surfactant-Extubate). * **Prevention:** Antenatal corticosteroids (Dexamethasone or Betamethasone) administered to the mother at risk of preterm labor.
Question 570: APGAR score is a measure of all except?
- A. Respiratory status
- B. Neurological status
- C. Nephrological status (Correct Answer)
- D. Circulatory status
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 focuses on vital systems required for immediate survival. ### **Explanation of Options** * **Nephrological status (Correct Answer):** The APGAR score does not assess renal function, urine output, or electrolyte balance. These parameters are not immediate indicators of neonatal resuscitation needs and are therefore excluded. * **Respiratory status:** Assessed via **Respiratory Effort** (Gasping, irregular, or vigorous cry). * **Neurological status:** Assessed via **Muscle Tone** (Activity) and **Reflex Irritability** (Grimace). These reflect the integrity of the central nervous system and neuromuscular function. * **Circulatory status:** Assessed via **Heart Rate** (Pulse) and **Skin Color** (Appearance/Perfusion). ### **The APGAR Mnemonic** | Sign | 0 Points | 1 Point | 2 Points | | :--- | :--- | :--- | :--- | | **A**ppearance (Color) | Blue/Pale | Body pink, limbs blue | Completely pink | | **P**ulse (Heart Rate) | Absent | < 100 bpm | > 100 bpm | | **G**rimace (Reflex) | No response | Grimace | Cry/Cough/Sneeze | | **A**ctivity (Tone) | Flaccid | Some flexion | Active motion | | **R**espiration | Absent | Slow/Irregular | Good/Crying | ### **High-Yield Clinical Pearls for NEET-PG** 1. **Timing:** Usually recorded at 1 and 5 minutes. If the 5-minute score is < 7, it is repeated every 5 minutes up to 20 minutes. 2. **Significance:** The 1-minute score indicates the **need for immediate resuscitation**, while the 5-minute score is a better **predictor of long-term neurological outcome/survival**. 3. **Limitations:** APGAR score is **not** used to decide when to initiate resuscitation; resuscitation must begin immediately if the infant is apneic or bradycardic. 4. **Most Sensitive Sign:** Heart rate is the most important prognostic clinical sign. 5. **First Sign to Disappear:** Color (Appearance) is usually the first to be lost during hypoxia.
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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