Neonatology Practice Questions

Q: What is the commonest type of seizure observed in newborns?

Subtle. **Explanation:** **Subtle seizures** are the most common type of neonatal seizures, accounting for approximately **50% of all cases**. This is primarily due to the neuroanatomical immaturity of the newborn brain. In neonates, the cerebral cortex is not yet sufficiently developed to sustain the synchronized electrical discharges required for generalized tonic-clonic activity. Instead, electrical discharges often manifest as fragmented, migratory, or "subtle" clinical signs. **Analysis of Options:** * **Subtle (Correct):** These present with inconspicuous signs such as bicycling/pedaling movements, rowing, eye deviation, blinking, smacking of lips, or episodes of apnea. They are frequently overlooked but are the most prevalent. * **Clonic:** These involve rhythmic jerking of muscle groups. While common in focal brain injuries (like stroke), they are less frequent than subtle seizures. * **Tonic:** Characterized by sustained posturing or stiffening of limbs. These are often associated with severe intraventricular hemorrhage in preterm infants but are not the most common overall. * **Myoclonic:** These involve rapid, single, or multiple lightning-like jerks. They are the least common type and often carry a poor neurological prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Hypoxic-Ischemic Encephalopathy (HIE) is the #1 cause of neonatal seizures. * **Drug of Choice:** **Phenobarbitone** remains the first-line anticonvulsant for neonatal seizures. * **Jitteriness vs. Seizures:** Unlike seizures, jitteriness is stimulus-sensitive, stops with passive flexion, and lacks abnormal eye movements. * **Pyridoxine Dependency:** Consider this in seizures refractory to standard anticonvulsants.

Q: The early neonatal period is defined as:

The first seven days of life. **Explanation:** The definition of the neonatal period is based on the chronological age of the infant following birth. It is divided into two distinct phases to reflect the different physiological risks and mortality patterns associated with each stage. 1. **Early Neonatal Period (Option B):** This is defined as the period from birth up to **less than 7 completed days of life** (0–6 days). This period is clinically significant because it carries the highest risk of mortality, often due to perinatal conditions such as birth asphyxia, prematurity, and congenital anomalies. 2. **Late Neonatal Period:** This extends from the 7th day of life until the completion of **28 days** (7–28 days). Deaths in this period are more frequently associated with community-acquired infections like sepsis or pneumonia. **Analysis of Incorrect Options:** * **Option A:** The first day of life is the "immediate" neonatal period, where the transition to extrauterine life occurs, but it does not encompass the full "early" definition. * **Option C:** The first 28 days of life define the **Total Neonatal Period**. * **Option D:** The first 14 days is not a standard epidemiological or clinical classification in neonatology. **High-Yield NEET-PG Pearls:** * **Perinatal Period:** Starts at 22 completed weeks (154 days) of gestation (when birth weight is normally 500g) and ends seven completed days after birth. * **Neonatal Mortality Rate (NMR):** Calculated as the number of deaths within the first 28 days per 1,000 live births. * **Most Common Cause of Neonatal Mortality in India:** Preterm birth and low birth weight, followed by infection and birth asphyxia.

Q: Which of the following is not a manifestation of neonatal tetanus?

Hypotonia. **Explanation:** Neonatal tetanus is caused by the toxin **tetanospasmin** produced by *Clostridium tetani*. The underlying pathophysiology involves the retrograde axonal transport of the toxin to the CNS, where it blocks the release of inhibitory neurotransmitters (GABA and glycine) from Renshaw cells. This results in **uncontrolled muscle spasms and hypertonia**, rather than hypotonia. * **Why Hypotonia is the correct answer:** In neonatal tetanus, the hallmark is **generalized muscle rigidity and spasms**. Hypotonia (floppiness) is characteristically absent; its presence would instead suggest conditions like neonatal sepsis, prematurity, or botulism (which causes flaccid paralysis). * **Why other options are incorrect:** * **Irritability:** This is often the earliest sign as the infant becomes restless due to increasing muscle stiffness. * **Difficult feeding:** This occurs due to **trismus** (lockjaw) and spasms of the masseter muscles, preventing the infant from sucking or latching onto the breast. * **Facial grimacing:** Persistent contraction of the facial muscles leads to a characteristic "sneering" expression known as **risus sardonicus**. **Clinical Pearls for NEET-PG:** * **Incubation Period:** Typically 3–14 days (the "Rule of 8 days" is a common clinical presentation). * **Portal of Entry:** Usually an unhygienic umbilical cord stump (omphalitis). * **Spasms:** Triggered by light, touch, or noise. * **Management:** Includes airway maintenance, Neutralization of toxin (Tetanus Immunoglobulin - TIG), Antibiotics (Metronidazole is preferred over Penicillin), and Diazepam for spasms. * **Prevention:** Maternal immunization with Tetanus Toxoid (TT/Td) and the "Five Cleans" during delivery.

Q: A mother acquires chickenpox two weeks before delivering a newborn. What intervention is necessary for the newborn?

Ophthalmic examination. **Explanation:** The timing of maternal varicella infection is critical in determining the risk to the fetus. When a mother acquires chickenpox **more than one week before delivery** (in this case, two weeks), the fetus is at risk of **Congenital Varicella Syndrome (CVS)**. 1. **Why Ophthalmic Examination is Correct:** CVS occurs when infection happens during the first 20 weeks of gestation (rarely up to 28 weeks). Since the mother was infected two weeks prior to delivery, the newborn is evaluated for features of CVS, which include **chorioretinitis**, microphthalmia, and cataracts. Therefore, an ophthalmic examination is essential to rule out these permanent structural damages. 2. **Why other options are incorrect:** * **Varicella Zoster Immunoglobulin (VZIG):** VZIG is indicated for newborns only if the mother develops the rash within **5 days before to 2 days after delivery**. In this scenario (2 weeks before), the mother has already had time to produce IgG antibodies and pass them transplacentally to the fetus, providing natural protection against severe neonatal varicella. * **I.V. Acyclovir:** This is reserved for infants who develop clinical symptoms of neonatal varicella (disseminated disease) or those born to mothers with active lesions at the time of birth who show signs of illness. It is not used prophylactically for CVS. **Clinical Pearls for NEET-PG:** * **Congenital Varicella Syndrome (CVS):** Characterized by **cicatricial skin scars** (zigzag patterns), limb hypoplasia, and ocular/CNS defects. * **Neonatal Varicella:** Occurs if maternal rash appears **-5 to +2 days** of delivery. This is a medical emergency with high mortality (up to 30%) due to lack of maternal antibodies. * **Management Rule:** If maternal rash is >7 days before delivery, the baby is usually safe from acute neonatal varicella due to passive immunity.

Q: The 2010 AHA Guidelines for CPR during Basic Life Support for neonates recommend which sequence?

Airway - Breathing - Compression (A-B-C). **Explanation:** The core principle of Neonatal Resuscitation (NRP) differs significantly from adult resuscitation. While the 2010 AHA Guidelines transitioned adult and pediatric BLS to the **C-A-B** sequence, **Neonatal Resuscitation remains A-B-C (Airway-Breathing-Compression).** **Why A-B-C is correct:** In adults, cardiac arrest is typically sudden and cardiac in origin (arrhythmias), making immediate chest compressions vital to maintain perfusion. In contrast, neonatal arrest is almost always **respiratory in origin**, resulting from a failure of gas exchange (asphyxia) during or after birth. Therefore, the priority is to establish a patent **Airway** and provide effective **Breathing** (ventilation) to reverse hypoxia. Compressions are only initiated if the heart rate remains below 60 bpm despite adequate ventilation. **Why other options are incorrect:** * **C-A-B / C-B-A:** These sequences prioritize circulation. While standard for adults, children, and infants in BLS, applying this to a neonate would delay life-saving ventilation, which is the most effective step in neonatal transition. * **B-A-C:** This is physiologically unsound as effective breathing cannot be established without first ensuring a patent airway. **High-Yield Clinical Pearls for NEET-PG:** * **The Golden Minute:** The first 60 seconds are dedicated to completing the initial steps, evaluating the infant, and starting bag-mask ventilation if required. * **Compression Ratio:** In neonates, the ratio is **3:1** (90 compressions and 30 breaths per minute), unlike the 15:2 or 30:2 used in older age groups. * **Most Important Step:** Effective **Positive Pressure Ventilation (PPV)** is the single most important and effective step in NRP. * **Target SpO2:** Do not expect 100% saturation immediately; at 1 minute, the target is only 60-65%.

Q: Every newborn is administered with what dose of vitamin K to prevent hemorrhagic disease of the newborn?

0.5 - 1 mg IM. **Explanation:** Vitamin K is essential for the synthesis of clotting factors II, VII, IX, and X. Newborns are naturally deficient in Vitamin K due to poor placental transfer, a sterile gut (lack of Vitamin K-producing bacteria), and low concentrations in breast milk. This deficiency can lead to **Vitamin K Deficiency Bleeding (VKDB)**, formerly known as Hemorrhagic Disease of the Newborn. **Why Option B is correct:** The standard recommendation by the American Academy of Pediatrics (AAP) and the National Neonatology Forum (NNF) India is a single intramuscular (IM) dose of Vitamin K1 (Phytonadione) administered within the first hour of birth: * **Preterm infants ( 1000g):** 1.0 mg IM Hence, the range **0.5 – 1 mg IM** is the gold standard for prophylaxis. **Analysis of Incorrect Options:** * **Options A & C (5-10 mg / 1-2 mg IV):** These doses are excessively high for routine prophylaxis. Intravenous (IV) administration is reserved for therapeutic management of active bleeding or emergency reversal of anticoagulation, not for routine newborn care. * **Option D (0.1 - 0.5 mg IM):** This dose is sub-therapeutic for term infants and fails to provide adequate protection against late-onset VKDB. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Injection:** Vastus lateralis (lateral aspect of the thigh). * **Oral Vitamin K:** While used in some countries, it is less effective than IM in preventing "Late VKDB" (which typically presents with intracranial hemorrhage). * **VKDB Classification:** * *Early:* Within 24 hours (usually due to maternal drugs like anticonvulsants). * *Classic:* Days 2–7 (due to low intake). * *Late:* Weeks 2–12 (associated with exclusive breastfeeding or malabsorption).

Q: What is the use of Ballard's scoring system in newborn babies?

Assessment of gestational age. **Explanation:** The **Ballard Scoring System** (specifically the New Ballard Score) is a clinical tool used to estimate the **gestational age** of a newborn. It is particularly useful when the mother’s Last Menstrual Period (LMP) is unknown or when there is a discrepancy between the dates and the clinical appearance of the baby. **Why Option A is Correct:** The system evaluates two main components: 1. **Neuromuscular Maturity:** Assesses muscle tone and neurological development (e.g., Posture, Square window, Arm recoil, Popliteal angle, Scarf sign, Heel to ear). 2. **Physical Maturity:** Assesses anatomical features that change with gestation (e.g., Skin texture, Lanugo, Plantar surface, Breast bud, Eye/Ear, Genitals). The combined score is plotted on a scale to determine the gestational age (from 20 to 44 weeks). **Why Other Options are Incorrect:** * **Option B:** Birth weight is measured using a weighing scale and is used to classify babies as LBW, VLBW, or ELBW, but it does not define gestational maturity. * **Option C:** Prediction of neonatal death is typically assessed using scores like **SNAP** (Score for Neonatal Acute Physiology) or **CRIB** (Clinical Risk Index for Babies). * **Option D:** Screening for sepsis involves the **Sepsis Screen** (CRP, TLC, ANC, I/T ratio, ESR) and blood cultures. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** The New Ballard Score is most accurate when performed within **24 hours** of birth (can be used up to 96 hours). * **Range:** The New Ballard Score can assess extremely premature neonates (down to **20 weeks**). * **Key Indicator:** The **Plantar creases** are one of the most reliable physical signs; they appear anteriorly at 32 weeks and cover the entire sole by term.

Q: Rubella virus infection is known to cause all of the following teratogenic effects except:

Conduction defects (e.g., heart block). **Explanation:** Congenital Rubella Syndrome (CRS) is a classic TORCH infection characterized by a specific triad of defects: **Cataracts, Sensorineural deafness, and Cardiac malformations.** 1. **Why Option C is correct:** While Rubella is notorious for causing structural cardiac defects, it is **not** typically associated with **conduction defects** like congenital heart block. Congenital heart block is a high-yield association for **Neonatal Lupus Erythematosus**, caused by the transplacental passage of maternal anti-Ro (SSA) and anti-La (SSB) antibodies. 2. **Why Options A and B are incorrect:** * **Microcephaly (Option A):** This is a common feature of the "expanded" Congenital Rubella Syndrome. The virus inhibits cell division and causes angiopathy, leading to impaired brain growth and CNS involvement (including mental retardation and meningoencephalitis). * **Ventricular Septal Defect (Option B):** Rubella causes various structural heart defects. While **Patent Ductus Arteriosus (PDA)** and **Peripheral Pulmonary Artery Stenosis** are the most characteristic, VSD and ASD are also frequently documented in affected neonates. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad (Gregg’s Triad):** Cataracts, Deafness (most common), and Cardiac defects (PDA is the most specific). * **Dermatological Sign:** "Blueberry muffin" spots (due to extramedullary hematopoiesis). * **Radiology:** "Celery stalking" appearance of long bones (metaphyseal lucencies). * **Risk Timing:** The risk of malformation is highest (up to 80%) if the mother is infected during the **first trimester** (especially the first 8 weeks).

Q: What is the most frequent cause of neonatal thrombocytopenic purpura?

Infection. **Explanation:** **1. Why Infection is the Correct Answer:** In neonatal medicine, **infection (sepsis)** is the most common cause of thrombocytopenia. It occurs in approximately 20–50% of neonates admitted to the NICU. The mechanism is multifactorial: it involves increased platelet consumption due to disseminated intravascular coagulation (DIC), direct bone marrow suppression by toxins, and immune-mediated destruction. Both bacterial (Gram-negative sepsis) and viral (TORCH infections like CMV) etiologies are significant contributors. **2. Analysis of Incorrect Options:** * **Drug Idiosyncrasy (B):** While certain maternal drugs (e.g., thiazides, hydralazine) can cause neonatal thrombocytopenia, this is rare compared to the high incidence of neonatal sepsis. * **Large Haemangiomas (C):** This refers to **Kasabach-Merritt Syndrome**, where platelets are sequestered within a vascular tumor. While it causes severe thrombocytopenia, it is a rare clinical entity. * **Erythroblastosis (D):** In Rh-incompatibility (Erythroblastosis Fetalis), thrombocytopenia can occur due to hypersplenism or marrow replacement by erythroid hyperplasia, but it is far less frequent than infection-induced causes. **3. NEET-PG High-Yield Pearls:** * **Definition:** Neonatal thrombocytopenia is defined as a platelet count ** 72 hours):** Almost always due to **Sepsis** or **Necrotizing Enterocolitis (NEC)**. * **Immune causes:** If the neonate is otherwise healthy but has severe thrombocytopenia, consider **Neonatal Alloimmune Thrombocytopenia (NAIT)**—the most common cause of *isolated* severe thrombocytopenia in an otherwise well term infant.

Q: A 32-week premature infant weighing 900gm is on the third day of life with a serum bilirubin level of 13 mg%. What is the treatment of choice?

Exchange transfusion. **Explanation:** The management of neonatal hyperbilirubinemia in preterm infants depends on birth weight, gestational age, and postnatal age. For a **900g (VLBW)** infant on the **third day of life**, a serum bilirubin of **13 mg/dL** is critically high and meets the threshold for an exchange transfusion. **1. Why Exchange Transfusion is correct:** In extremely low birth weight (ELBW) and very low birth weight (VLBW) infants, the blood-brain barrier is immature, increasing the risk of bilirubin encephalopathy (kernicterus) at much lower levels than in term infants. According to standard guidelines (like those from the AAP or AIIMS), for an infant <1000g, the threshold for **Phototherapy** is usually **5 mg/dL**, and the threshold for **Exchange Transfusion** is **10-12 mg/dL**. Since 13 mg/dL exceeds this limit, immediate exchange transfusion is required to prevent neurotoxicity. **2. Why other options are incorrect:** * **Phototherapy:** While this infant certainly needs phototherapy, it is insufficient at this level. Phototherapy is a preventive measure; once bilirubin reaches exchange thresholds, it is considered a medical emergency. * **Wait and watch:** This is dangerous. Delaying treatment in a 900g infant with high bilirubin leads to permanent neurological damage. * **Pharmacologic therapy:** Drugs like Phenobarbitone take 48–72 hours to act and are not used for acute management of high bilirubin levels. **Clinical Pearls for NEET-PG:** * **Rule of Thumb for Exchange Transfusion in Preterms:** A common clinical guide is to perform an exchange transfusion when the bilirubin level (in mg/dL) exceeds **1% of the birth weight in grams** (e.g., for 1000g, threshold is 10 mg/dL). * **Double Volume Exchange Transfusion (DVET):** Uses 160 ml/kg of blood; it removes about 85% of sensitized RBCs and 50% of bilirubin. * **Most common cause** of early jaundice (<24 hours) is ABO or Rh incompatibility.

Question 1

What is the commonest type of seizure observed in newborns?

Accepted Answer

Subtle

Answer

Clonic

Answer

Tonic

Answer

Myoclonic

Question 2

The early neonatal period is defined as:

Accepted Answer

The first seven days of life

Answer

The first day of life

Answer

The first twenty-eight days of life

Answer

The first fourteen days of life

Question 3

Which of the following is not a manifestation of neonatal tetanus?

Accepted Answer

Hypotonia

Answer

Irritability

Answer

Difficult feeding

Answer

Facial grimacing

Question 4

A mother acquires chickenpox two weeks before delivering a newborn. What intervention is necessary for the newborn?

Accepted Answer

Ophthalmic examination

Answer

I.V. Acyclovir

Answer

Varicella zoster immunoglobulin

Answer

All of the above

Question 5

The 2010 AHA Guidelines for CPR during Basic Life Support for neonates recommend which sequence?

Accepted Answer

Airway - Breathing - Compression (A-B-C)

Answer

Compression - Breathing - Airway (C-B-A)

Answer

Compression - Airway - Breathing (C-A-B)

Answer

Breathing - Airway - Compression (B-A-C)

Question 6

Every newborn is administered with what dose of vitamin K to prevent hemorrhagic disease of the newborn?

Accepted Answer

0.5 - 1 mg IM

Answer

5 - 10 mg IV

Answer

1 - 2 mg IV

Answer

0.1 - 0.5 mg IM

Question 7

What is the use of Ballard's scoring system in newborn babies?

Accepted Answer

Assessment of gestational age

Answer

Assessment of birth weight

Answer

Prediction of neonatal death

Answer

Screening for sepsis

Question 8

Rubella virus infection is known to cause all of the following teratogenic effects except:

Accepted Answer

Conduction defects (e.g., heart block)

Answer

Microcephaly

Answer

Ventricular Septal Defect (VSD)

Answer

All of the above

Question 9

What is the most frequent cause of neonatal thrombocytopenic purpura?

Accepted Answer

Infection

Answer

Drug idiosyncrasy

Answer

Large haemangiomas

Answer

Erythroblastosis

Question 10

A 32-week premature infant weighing 900gm is on the third day of life with a serum bilirubin level of 13 mg%. What is the treatment of choice?

Accepted Answer

Exchange transfusion

Answer

Phototherapy

Answer

Wait and watch therapy

Answer

Pharmacologic therapy

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?