Neonatology — MCQs

A newborn is evaluated at 1 and 5 minutes following birth. Evaluation of the infant at 5 minutes showed a pink body and blue extremities, a heart rate of 90, with slow respiratory effort, actively moving the extremities, and was coughing when a catheter was inserted into the nostril. What is the APGAR score of the infant at 5 minutes?

Q229Medium

A newborn presented with severe respiratory distress. On examination, the infant was found to have a scaphoid abdomen and absent breath sounds on the left side of the chest. What is the most likely diagnosis?

Q230Easy

Which of the following is NOT true about apnoea in a preterm baby?

Neonatology Indian Medical PG Practice Questions and MCQs

Question 221: Which statement is not true about cephalohaematoma?

A. Not limited by sutures (Correct Answer)
B. Swelling subsides in 3 months
C. Caused by periosteal injury of the skull
D. None of the above

Explanation: **Explanation:** The correct answer is **A (Not limited by sutures)** because this statement is false. A cephalhematoma is a collection of blood between the **periosteum and the skull bone**. Because the periosteum is firmly attached to the edges of each individual cranial bone at the suture lines, the bleeding is physically confined and **cannot cross suture lines**. **Analysis of Options:** * **Option A (Not limited by sutures):** This is the incorrect statement. Caput succedaneum (edema of the scalp) crosses sutures, whereas cephalhematoma does not. * **Option B (Swelling subsides in 3 months):** This is a true statement. Most cephalhematomas resolve spontaneously within 2 to 12 weeks. * **Option C (Caused by periosteal injury):** This is true. It results from the rupture of subperiosteal blood vessels, often due to birth trauma or instrumental delivery (forceps/vacuum). **High-Yield Clinical Pearls for NEET-PG:** 1. **Cephalhematoma vs. Caput Succedaneum:** * *Caput:* Present at birth, crosses sutures, involves soft tissue edema. * *Cephalhematoma:* Appears hours after birth, does **not** cross sutures, involves subperiosteal blood. 2. **Subgaleal Hemorrhage:** This is the "dangerous" one. It occurs between the aponeurosis and periosteum, is **not** limited by sutures, and can lead to massive blood loss and shock. 3. **Complications:** While usually benign, large cephalhematomas can lead to **unconjugated hyperbilirubinemia** (jaundice) as the blood breaks down, or rarely, underlying linear skull fractures. 4. **Management:** Observation only. Incision and drainage are contraindicated due to the high risk of infection (osteomyelitis).

Question 222: A newborn develops erythematous papular lesions on the face and trunk after 2-3 days of life. A smear of the pustular lesions is prepared. What cells would be seen in the smear?

A. Basophils
B. Eosinophils (Correct Answer)
C. Neutrophils
D. Monocytes

Explanation: ### Explanation The clinical presentation described is classic for **Erythema Toxicum Neonatorum (ETN)**, the most common benign self-limiting cutaneous eruption in newborns. **Why Eosinophils are the Correct Answer:** Erythema Toxicum Neonatorum typically appears between **24 to 72 hours** of life. It is characterized by erythematous macules, papules, and occasionally pustules ("flea-bite" appearance) on the trunk and face, sparing the palms and soles. The hallmark diagnostic feature of ETN is the presence of **innumerable eosinophils** on a Wright-stained or Giemsa-stained smear of the pustular contents. While the exact etiology is unknown, it is thought to be an immature immune response to microbial colonization of hair follicles. **Analysis of Incorrect Options:** * **Neutrophils:** These are the predominant cells in **Transient Neonatal Pustular Melanosis (TNPM)**. TNPM is present at birth (unlike ETN) and leaves behind hyperpigmented macules. * **Basophils:** These are rarely found in neonatal skin smears and are not associated with common benign newborn rashes. * **Monocytes:** While present in chronic inflammatory processes, they are not the diagnostic cell type for acute neonatal pustular eruptions. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** ETN usually appears at 2–3 days; TNPM is present at birth. * **Distribution:** ETN spares palms and soles; TNPM can involve them. * **Management:** No treatment is required for ETN; it resolves spontaneously within 1–2 weeks. Reassurance to parents is the key. * **Differential Diagnosis:** If a smear shows **bacteria** or **yeast**, consider Staphylococcal pyoderma or Congenital Candidiasis instead of ETN.

Question 223: Which artery is best to palpate for a pulse in infants?

A. Femoral artery
B. Radial artery
C. Carotid artery
D. Brachial artery (Correct Answer)

Explanation: **Explanation:** In infants (children under 1 year of age), the **brachial artery** is the preferred site for pulse palpation, especially during emergency assessments and Basic Life Support (BLS). **1. Why the Brachial Artery is Correct:** Infants have short, thick necks with abundant subcutaneous fat, making the carotid pulse difficult to locate. Additionally, their small wrists make the radial pulse unreliable. The brachial artery is relatively superficial and runs along the medial aspect of the mid-arm (between the elbow and shoulder). It is easily accessible and can be compressed against the humerus, providing a reliable assessment of heart rate and perfusion. **2. Why Other Options are Incorrect:** * **Femoral Artery:** While the femoral artery is a valid alternative in infants, it is often covered by diapers and clothing, making it less accessible than the brachial artery during an initial rapid assessment. * **Radial Artery:** This is the standard site for adults and older children, but in infants, the vessel is very small and deep, making it difficult to palpate accurately. * **Carotid Artery:** In infants, the short neck and presence of fat pads make the carotid pulse difficult to palpate without accidentally compressing the airway or the vagus nerve. **Clinical Pearls for NEET-PG:** * **PALS Guideline:** For infants (<1 year), use the **Brachial** or **Femoral** pulse. For children (>1 year to puberty), use the **Carotid** or **Femoral** pulse. * **Technique:** Use 2 or 3 fingers to palpate the medial arm for at least 5 but no more than 10 seconds. * **Critical Value:** In pediatric resuscitation, if the heart rate is **<60 bpm** with signs of poor perfusion despite adequate oxygenation, chest compressions must be started.

Question 224: A newborn child developed respiratory depression in the neonatal ward. Which of the following drugs is a common cause?

A. Opioids (Correct Answer)
B. Barbiturates
C. Diazepam
D. Propofol

Explanation: **Explanation:** **1. Why Opioids are the correct answer:** Opioids (such as morphine, pethidine, or fentanyl) are the most common pharmacological cause of neonatal respiratory depression, particularly when administered to the mother during labor or directly to the neonate for sedation. Opioids cross the blood-brain barrier and act on **mu-receptors** in the medullary respiratory centers, decreasing their sensitivity to carbon dioxide (CO₂). This leads to a decreased respiratory rate and tidal volume. A classic sign of opioid-induced depression in a neonate is **pinpoint pupils** and a prompt response to the antagonist **Naloxone**. **2. Analysis of Incorrect Options:** * **Barbiturates (B):** While they can cause respiratory depression in high doses (status epilepticus management), they are not the "common" cause in a standard neonatal ward setting compared to opioids. * **Diazepam (C):** Benzodiazepines can cause hypotonia ("Floppy Infant Syndrome") and mild respiratory depression, but they primarily affect muscle tone and are less likely to cause profound apnea than opioids. * **Propofol (D):** This is an induction agent used in controlled surgical settings. It is not a "common" cause of unexpected respiratory depression in a general neonatal ward. **3. Clinical Pearls for NEET-PG:** * **Antidote:** Naloxone (0.1 mg/kg IV/IM) is the specific antagonist for opioid-induced depression. * **Contraindication:** Naloxone should **never** be given to a neonate born to a mother with chronic opioid addiction, as it can precipitate life-threatening acute withdrawal seizures. * **Priority:** In any case of neonatal respiratory depression, the first step is always **Positive Pressure Ventilation (PPV)**, not drug administration. * **Magnesium Sulfate:** If the mother received MgSO₄ for eclampsia, the neonate may present with respiratory depression and hypotonia; the antidote is Calcium Gluconate.

Question 225: Which of the following is NOT a use of pulse oximetry?

A. To check for apnea
B. To confirm presence of cyanosis
C. To differentiate cardiac from non-cardiac cause of cyanosis (Correct Answer)
D. In the delivery room for resuscitation of a neonate

Explanation: **Explanation:** The correct answer is **C (To differentiate cardiac from non-cardiac cause of cyanosis)**. While pulse oximetry measures oxygen saturation ($SpO_2$), it cannot distinguish between the etiologies of hypoxia. To differentiate between cardiac (e.g., Cyanotic Congenital Heart Disease) and non-cardiac (e.g., Lung disease) causes, the **Hyperoxic Test** is used. This involves administering 100% oxygen and measuring arterial $PaO_2$ via an Arterial Blood Gas (ABG). If $PaO_2$ remains low (<150 mmHg), a cardiac shunt is suspected. **Analysis of other options:** * **Option A (To check for apnea):** Pulse oximetry is a standard tool for monitoring apnea of prematurity. A drop in $SpO_2$ (desaturation) often follows a cessation of breathing, alerting clinicians to the event. * **Option B (To confirm presence of cyanosis):** Clinical assessment of cyanosis is subjective and unreliable (requires >5g/dL of deoxygenated hemoglobin). Pulse oximetry provides an objective measurement of sub-clinical or central cyanosis. * **Option D (In the delivery room):** Per NRP (Neonatal Resuscitation Program) guidelines, pulse oximetry is mandatory when resuscitation is anticipated, to monitor the "Target $SpO_2$" levels in the first 10 minutes of life. **High-Yield Clinical Pearls for NEET-PG:** * **Pre-ductal vs. Post-ductal:** In CCHD screening, the probe is placed on the **right hand** (pre-ductal) and either **foot** (post-ductal). A difference of >3% is significant. * **Limitations:** Pulse oximetry is unreliable in states of poor perfusion (shock), severe anemia, and carbon monoxide poisoning (carboxyhemoglobin). * **Target $SpO_2$ at 1 min:** 60–65%; **at 5 mins:** 80–85%; **at 10 mins:** 85–95%.

Question 226: Vitamin K injection is given to a newborn within 1 hour of birth for which of the following reasons?

A. Prevention of necrotizing enterocolitis
B. Prevention of hemorrhagic disease of the newborn (Correct Answer)
C. Prevention of neonatal seizures
D. Prevention of neonatal tetanus

Explanation: **Explanation:** **1. Why Option B is Correct:** Newborns are naturally deficient in Vitamin K because it crosses the placenta poorly, and the neonatal gut is sterile (lacking the bacteria required for Vitamin K synthesis). Vitamin K is a vital cofactor for the **gamma-carboxylation of clotting factors II, VII, IX, and X**. Without it, these factors remain inactive, leading to **Vitamin K Deficiency Bleeding (VKDB)**, historically known as Hemorrhagic Disease of the Newborn. Administering 1 mg of Vitamin K intramuscularly (IM) within one hour of birth is the standard of care to prevent early, classical, and late-onset bleeding. **2. Why Other Options are Incorrect:** * **Option A:** Necrotizing Enterocolitis (NEC) is primarily associated with prematurity and formula feeding; its prevention involves breast milk and cautious enteral feeding, not Vitamin K. * **Option C:** Neonatal seizures are typically caused by hypoxic-ischemic encephalopathy (HIE), hypoglycemia, or electrolyte imbalances. * **Option D:** Neonatal tetanus is prevented by maternal immunization with Tetanus Toxoid (TT) and ensuring clean cord care (the "Six Cleans"). **Clinical Pearls for NEET-PG:** * **Dose:** 1 mg IM for infants >1500g; 0.5 mg IM for infants <1500g. * **Route:** Intramuscular is preferred over oral due to better absorption and prevention of "late" VKDB. * **Late VKDB:** Occurs between 2 weeks to 6 months, often presenting as intracranial hemorrhage; it is most common in exclusively breastfed infants who did not receive Vitamin K at birth (breast milk is low in Vitamin K). * **PIVKA:** Proteins Induced by Vitamin K Absence (PIVKA-II) is a sensitive marker for Vitamin K deficiency.

Question 227: What is the mechanism by which phenobarbital and metalloporphyrin act respectively to reduce bilirubin levels in neonatal jaundice?

A. Enhance secretion of conjugated bilirubin and induce bilirubin conjugation by UDP Glucuronyltransferase
B. Induce bilirubin conjugation by UDP Glucuronyltransferase and competitive inhibition of hemeoxygenase (Correct Answer)
C. Induce bilirubin conjugation by UDP Glucuronyltransferase and enhance secretion of conjugated bilirubin
D. Competitive inhibition of hemeoxygenase and enhance secretion of conjugated bilirubin

Explanation: **Explanation:** The management of neonatal jaundice involves targeting different steps in the bilirubin metabolic pathway. **1. Why Option B is Correct:** * **Phenobarbital:** It is a potent inducer of the microsomal enzyme **UDP-Glucuronyltransferase (UGT1A1)**. By increasing the activity of this enzyme, it enhances the conjugation of indirect (unconjugated) bilirubin into direct (conjugated) bilirubin, facilitating its excretion. It also increases the concentration of ligandin (Y-protein) in hepatocytes, improving bilirubin uptake. * **Metalloporphyrins (e.g., Tin-mesoporphyrin):** These are synthetic analogs of heme. They act as **competitive inhibitors of Heme Oxygenase**, the rate-limiting enzyme that converts heme into biliverdin. By blocking this enzyme, they decrease the actual production of bilirubin. **2. Why Other Options are Incorrect:** * **Options A, C, and D:** These options incorrectly suggest that metalloporphyrins enhance the secretion of conjugated bilirubin. While some drugs (like phenobarbital) may marginally improve bile flow, the primary and high-yield mechanism for metalloporphyrins is always the inhibition of bilirubin *production* via heme oxygenase, not the enhancement of *secretion*. **3. NEET-PG High-Yield Pearls:** * **Phenobarbital** is primarily used in Crigler-Najjar Syndrome Type II (Arias Syndrome) to differentiate it from Type I (where it has no effect). * **Metalloporphyrins** are currently experimental/alternative therapies used to prevent the need for exchange transfusion in refractory cases. * **Phototherapy** (the mainstay of treatment) works via **structural isomerization** (lumirubin formation), **configurational isomerization**, and **photo-oxidation**. Lumirubin formation is the most important irreversible pathway. * **Heme Oxygenase** is the rate-limiting enzyme in heme catabolism.

Question 228: A newborn is evaluated at 1 and 5 minutes following birth. Evaluation of the infant at 5 minutes showed a pink body and blue extremities, a heart rate of 90, with slow respiratory effort, actively moving the extremities, and was coughing when a catheter was inserted into the nostril. What is the APGAR score of the infant at 5 minutes?

A. 5
B. 6
C. 7 (Correct Answer)
D. 8

Explanation: ### Explanation The APGAR score is a rapid clinical tool used to assess a newborn's transition to extrauterine life. It is calculated at 1 and 5 minutes after birth based on five parameters: **A**ppearance, **P**ulse, **G**rimace, **A**ctivity, and **R**espiration. **Breakdown of the 5-minute APGAR score for this infant:** 1. **Appearance (Color):** Pink body with blue extremities (Acrocyanosis) = **1 point**. 2. **Pulse (Heart Rate):** 90 beats per minute (Less than 100 bpm) = **1 point**. 3. **Grimace (Reflex Irritability):** Coughing/sneezing during catheter insertion = **2 points**. 4. **Activity (Muscle Tone):** Actively moving extremities = **2 points**. 5. **Respiration (Respiratory Effort):** Slow/irregular respiratory effort = **1 point**. **Total Score: 1 + 1 + 2 + 2 + 1 = 7.** #### Why other options are incorrect: * **Option A (5) & B (6):** These scores underestimate the infant’s vigorous reflex irritability (coughing) and active muscle tone, which both warrant full points (2 each). * **Option D (8):** This score would be correct only if the heart rate was >100 bpm and the respiratory effort was strong/regular (crying). #### NEET-PG High-Yield Pearls: * **Timing:** If the 5-minute score is <7, assessment should continue every 5 minutes up to 20 minutes. * **Prognostic Value:** The 5-minute score is a better predictor of neonatal survival and long-term neurological outcomes than the 1-minute score. * **Most Sensitive Parameter:** Heart rate is the most important and usually the last to disappear. * **Least Reliable Parameter:** Color (Appearance) is the most subjective and often the first to change. * **Acrocyanosis:** It is a normal finding in the first 24–48 hours of life and consistently results in a score of 1 for Appearance.

Question 229: A newborn presented with severe respiratory distress. On examination, the infant was found to have a scaphoid abdomen and absent breath sounds on the left side of the chest. What is the most likely diagnosis?

A. Transient tachypnea of the newborn
B. Congenital adenomatoid lung disease
C. Congenital diaphragmatic hernia (Correct Answer)
D. Sequestration of the lung

Explanation: **Explanation:** The clinical presentation of severe respiratory distress, a **scaphoid abdomen** (sunken appearance), and **absent breath sounds** on one side (typically the left) is the classic triad for **Congenital Diaphragmatic Hernia (CDH)**. **1. Why the Correct Answer is Right:** CDH occurs due to the failure of the pleuroperitoneal membranes to fuse (most commonly through the **Foramen of Bochdalek** on the left side). This allows abdominal viscera (stomach, intestines, spleen) to herniate into the thoracic cavity. The presence of abdominal contents in the chest leads to a "scaphoid" abdomen, displaces the heart (mediastinal shift), and causes ipsilateral absent breath sounds. The primary cause of mortality is **pulmonary hypoplasia** and persistent pulmonary hypertension. **2. Why the Other Options are Wrong:** * **Transient Tachypnea of the Newborn (TTN):** Caused by delayed resorption of fetal lung fluid. It presents with mild-to-moderate distress in term/near-term babies (often post-LSCS) and shows "wet lung" on X-ray, not a scaphoid abdomen. * **Congenital Pulmonary Airway Malformation (CPAM/CCAM):** A multicystic mass of abnormal lung tissue. While it causes respiratory distress and mediastinal shift, the abdomen remains normal (protuberant), not scaphoid. * **Bronchopulmonary Sequestration:** A non-functioning mass of lung tissue with an anomalous systemic blood supply. It is often asymptomatic at birth or presents later with recurrent infections. **Clinical Pearls for NEET-PG:** * **Most common site:** Left side (85%), through the Foramen of Bochdalek (Posterolateral). * **Initial Management:** Immediate **endotracheal intubation**. Avoid bag-and-mask ventilation as it distends the herniated bowel, further compressing the lungs. * **X-ray finding:** Air-filled loops of bowel in the hemithorax with a shift of the mediastinum to the opposite side. * **Definitive Treatment:** Surgical repair after stabilizing pulmonary hypertension (usually after 24–48 hours).

Question 230: Which of the following is NOT true about apnoea in a preterm baby?

A. Apnoea duration less than 20 seconds (Correct Answer)
B. Associated with bradycardia
C. Leads to hypoxia
D. May cause cyanosis

Explanation: **Explanation:** In neonatology, **Apnea of Prematurity (AOP)** is strictly defined by specific clinical criteria. The correct answer is **A** because the definition of apnea requires a cessation of breathing for **20 seconds or more**. If the pause is shorter than 20 seconds, it is only considered apnea if it is accompanied by significant physiological changes like bradycardia or oxygen desaturation. **Breakdown of Options:** * **Option A (Correct):** Apnea is defined as a respiratory pause lasting **>20 seconds**. Therefore, a duration of *less* than 20 seconds (without other symptoms) does not meet the diagnostic criteria. * **Option B:** Apnea in preterms is frequently associated with **bradycardia** (Heart Rate <100 bpm) due to the immature autonomic nervous system and hypoxic triggers. * **Option C & D:** Prolonged cessation of airflow inevitably leads to **hypoxia** (low oxygen saturation) and clinical **cyanosis** (bluish discoloration), as the preterm infant has low functional residual capacity and cannot maintain oxygenation during the pause. **Clinical Pearls for NEET-PG:** * **Types of Apnea:** 1. **Central (most common):** Total absence of respiratory effort. 2. **Obstructive:** Effort exists but no airflow (due to pharyngeal collapse). 3. **Mixed:** A combination of both. * **Periodic Breathing:** This is a normal variant characterized by short pauses (5–10 seconds) followed by rapid breathing, *without* bradycardia or cyanosis. * **Management:** The drug of choice is **Caffeine Citrate** (it stimulates the respiratory center and has a wide therapeutic index). Nasal CPAP is the preferred non-invasive ventilation strategy.

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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