Neonatology Practice Questions

Q: Extremely low birth weight is defined as birth weight below:

1000 gm. **Explanation:** The classification of birth weight is a fundamental concept in neonatology, used to predict neonatal morbidity and mortality. The correct answer is **1000 gm** based on the standard World Health Organization (WHO) and American Academy of Pediatrics (AAP) definitions. **1. Why Option A is Correct:** * **Extremely Low Birth Weight (ELBW):** Defined as a birth weight **less than 1000 grams**. These infants are at the highest risk for complications such as Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). **2. Why Other Options are Incorrect:** * **Option B (1200 gm):** This is an arbitrary number and does not correspond to a standard clinical classification. * **Option C (1500 gm):** This defines **Very Low Birth Weight (VLBW)**. VLBW infants are those weighing less than 1500 grams. * **Option D (2500 gm):** This defines **Low Birth Weight (LBW)**. Any infant weighing less than 2500 grams at birth, regardless of gestational age, falls into this category. **High-Yield Clinical Pearls for NEET-PG:** * **Micropremie:** Often used clinically for infants weighing less than **750 gm** or born before 26 weeks. * **Incredible Low Birth Weight (ILBW):** A newer, less common term sometimes used for infants **< 750 gm**. * **Normal Birth Weight:** 2500 gm to 3999 gm. * **Macrosomia:** Birth weight **≥ 4000 gm** (often associated with maternal diabetes). * **Small for Gestational Age (SGA):** Weight below the 10th percentile for a specific gestational age (distinct from LBW, which is based on absolute weight).

Q: Regarding Cephalohematoma, all the following are true EXCEPT?

It may extend across the midline and cross suture lines.. ### Explanation **Concept Overview:** Cephalohematoma is a collection of blood between the skull bone and its overlying periosteum. The key to answering this question lies in the anatomical boundaries of the periosteum. **1. Why Option B is the Correct Answer (The "Except" statement):** In a cephalohematoma, the hemorrhage is **subperiosteal**. Because the periosteum is firmly attached to the edges of the individual cranial bones at the **sutures**, the bleeding is strictly confined to the surface of that specific bone. Therefore, a cephalohematoma **never crosses suture lines**. This distinguishes it clinically from *Caput Succedaneum* (which is subcutaneous edema) and *Subgaleal Hemorrhage* (which is between the periosteum and the aponeurosis). **2. Analysis of Other Options:** * **Option A:** True. By definition, it is a subperiosteal bleed, usually involving the parietal or occipital bones. * **Option C:** True. It is a common birth injury occurring in approximately 1–2% of live births, often associated with vacuum or forceps-assisted deliveries. * **Option D:** True. While most cases are benign, an underlying linear skull fracture is present in about 10–25% of cases. **Clinical Pearls for NEET-PG:** * **Timing:** Unlike Caput (present at birth), cephalohematoma often appears **hours to days after birth** as the bleeding is slow. * **Resolution:** It takes weeks to months to resolve and may undergo **peripheral calcification**, giving it a "hard" feel. * **Complications:** Watch for **unconjugated hyperbilirubinemia** (as the blood breaks down) and anemia. * **Management:** Observation only. **Incision and drainage are contraindicated** due to the high risk of introducing infection (osteomyelitis).

Q: Which of the following is a characteristic feature of hemorrhagic disease of the newborn?

Prolonged prothrombin time. **Explanation:** **Hemorrhagic Disease of the Newborn (HDN)**, now more commonly referred to as **Vitamin K Deficiency Bleeding (VKDB)**, occurs because neonates have low stores of Vitamin K at birth. Vitamin K is essential for the post-translational carboxylation of **Factors II, VII, IX, and X**. **Why Option A is Correct:** Vitamin K deficiency primarily affects the **extrinsic and common pathways** of the coagulation cascade. **Factor VII** has the shortest half-life among the vitamin K-dependent factors; therefore, its deficiency occurs early and rapidly leads to a **prolonged Prothrombin Time (PT)**. While Activated Partial Thromboplastin Time (aPTT) is also prolonged, PT is the most sensitive screening test for this condition. **Why Other Options are Incorrect:** * **B & C (Platelet count and Bleeding Time):** HDN is a secondary hemostasis defect (clotting factor deficiency). Primary hemostasis, which involves platelets and blood vessel interaction, remains intact. Therefore, platelet count and bleeding time are **normal**. * **D (Thrombin Time):** Thrombin time measures the conversion of fibrinogen to fibrin. This process is not dependent on Vitamin K; hence, it remains **normal** in HDN. **High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis:** All newborns should receive **1 mg of Vitamin K intramuscularly** at birth to prevent VKDB. * **Classification:** * *Early:* Within 24 hours (usually due to maternal drugs like anticonvulsants). * *Classic:* 2–7 days (due to poor feeding/low breast milk intake). * *Late:* 2 weeks to 6 months (often associated with exclusive breastfeeding or malabsorption). * **Breast Milk vs. Cow Milk:** Breast milk is notoriously low in Vitamin K (approx. 1–2 μg/L) compared to cow’s milk (approx. 5–10 μg/L).

Q: Which of the following is used to monitor respiration in a neonate who is not intubated?

Impedance pneumography. ### Explanation **1. Why Impedance Pneumography is Correct:** Impedance pneumography is the standard technology used in bedside neonatal monitors to track respiration in non-intubated infants. It works by passing a high-frequency, low-amplitude electrical current between two ECG electrodes placed on the chest. As the neonate breathes, the volume of air in the lungs changes, altering the **transthoracic electrical impedance**. The monitor detects these cyclical changes in resistance and converts them into a respiratory rate and waveform. **2. Analysis of Incorrect Options:** * **Capnography & Infrared End-Tidal CO2 (Options A & D):** These methods measure the concentration of CO2 in exhaled air. While highly accurate, they typically require an interface with an endotracheal tube (intubated patients) or a specialized nasal cannula. In non-intubated neonates, "blow-by" oxygen or small tidal volumes make these methods technically difficult and less reliable for routine continuous monitoring compared to impedance. * **Chest Movements (Option C):** Visual observation of chest wall excursions is a clinical assessment tool, not a continuous automated monitoring technology. It is prone to human error and cannot provide an automated alarm system for apnea. **3. Clinical Pearls for NEET-PG:** * **Limitation of Impedance Pneumography:** It cannot distinguish between **obstructive apnea** and normal breathing. In obstructive apnea, the chest wall still moves (changing impedance), so the monitor may falsely show a normal respiratory rate despite the absence of airflow. * **Gold Standard for Apnea:** Polysomnography (which includes thermistors to detect airflow) is the gold standard for diagnosing types of apnea. * **Electrode Placement:** For optimal impedance monitoring in neonates, electrodes should be placed in the mid-axillary line at the level of the nipples.

Q: A newborn is infected in utero with an enveloped virus containing double-stranded DNA. The child develops petechiae, hepatosplenomegaly, and jaundice. Brain calcifications are detected on computed tomography (CT). With which of the following viruses is the newborn most likely infected?

Cytomegalovirus. **Explanation:** The clinical presentation of petechiae (blueberry muffin rash), hepatosplenomegaly, jaundice, and intracranial calcifications in a neonate is classic for a **Congenital TORCH infection**. **1. Why Cytomegalovirus (CMV) is correct:** CMV is the most common intrauterine infection. It is an **enveloped, double-stranded DNA virus** (a member of the Herpesviridae family). The hallmark finding on CT is **periventricular calcifications** (calcifications lining the ventricles). This distinguishes it from Toxoplasmosis, which typically presents with diffuse cortical calcifications. Other features like microcephaly, sensorineural hearing loss (the most common long-term sequela), and chorioretinitis are also frequently seen. **2. Why the other options are incorrect:** * **Hepatitis B (HBV):** While it is an enveloped DNA virus, neonatal infection usually occurs during delivery (perinatally) rather than in utero. It typically results in a chronic carrier state rather than acute congenital malformations or intracranial calcifications. * **Hepatitis C (HCV) & Hepatitis D (HDV):** These are **RNA viruses** (HCV is Flavivirus; HDV is a defective Deltavirus). They do not cause the classic TORCH constellation of petechiae and brain calcifications. **Clinical Pearls for NEET-PG:** * **CMV:** Periventricular calcifications + Sensorineural hearing loss (SNHL). * **Toxoplasmosis:** Diffuse calcifications + Hydrocephalus + Chorioretinitis. * **Congenital Rubella:** PDA + Cataracts + SNHL (Blueberry muffin rash). * **Diagnosis:** Urine or saliva PCR within the first 3 weeks of life is the gold standard for congenital CMV. * **Treatment:** Intravenous Ganciclovir or oral Valganciclovir is used to reduce the severity of hearing loss and developmental delays.

Question 1

Extremely low birth weight is defined as birth weight below:

Accepted Answer

1000 gm

Answer

1200 gm

Answer

1500 gm

Answer

2500 gm

Question 2

Regarding Cephalohematoma, all the following are true EXCEPT?

Accepted Answer

It may extend across the midline and cross suture lines.

Answer

It is a subperiosteal hemorrhage.

Answer

It occurs in 1-2% of live births.

Answer

An underlying skull fracture may be associated in 10-25% of cases.

Question 3

Which of the following is a characteristic feature of hemorrhagic disease of the newborn?

Accepted Answer

Prolonged prothrombin time

Answer

Defective platelet count

Answer

Prolonged bleeding time

Answer

Prolonged thrombin time

Question 4

A baby is born to an HBsAg positive mother. Which of the following is required for the prevention of mother-to-child transmission of Hepatitis B?

Accepted Answer

Hepatitis B immunoglobulin (HBIG) with the first dose of Hepatitis B vaccine at birth, followed by routine Hepatitis B vaccination.

Answer

Hepatitis B vaccine at 0, 1, and 6 months.

Answer

Hepatitis B immunoglobulin (HBIG) and lamivudine prophylaxis.

Answer

Hepatitis B vaccine and lamivudine prophylaxis.

Question 5

A two-day-old baby presented with severe respiratory distress. On examination, a scaphoid abdomen and decreased breath sounds on the left side were observed. The baby was managed by prompt endotracheal intubation. After ET tube placement, the maximal cardiac impulse shifted further to the right side. What should be the next step in management?

Accepted Answer

Remove the tube and reattempt intubation

Answer

Confirm the position of the endotracheal tube by chest X-ray

Answer

Nasogastric tube insertion and decompress the bowel

Answer

Chest X-ray to confirm diagnosis

Question 6

Which of the following is used to monitor respiration in a neonate who is not intubated?

Accepted Answer

Impedance pneumography

Answer

Capnography

Answer

Chest movements

Answer

Infrared End Tidal CO2

Question 7

Which of the following statements about Intrauterine Growth Restriction (IUGR) is true?

Accepted Answer

The head circumference is typically 3 cm greater than the chest circumference in IUGR.

Answer

Hepatomegaly in IUGR is due to fatty infiltration.

Answer

Hyaline membrane disease is a common cause of death in IUGR.

Answer

Hypothermia does not occur in IUGR due to effective shivering mechanisms.

Question 8

Which of the following statements is true regarding the resuscitation of a neonate born through meconium-stained amniotic fluid?

Accepted Answer

At least one person skilled in endotracheal intubation should be available during resuscitation.

Answer

Intrapartum suctioning of the mouth and nose may be performed.

Answer

Postnatal tracheal suctioning should be performed for all non-vigorous neonates.

Answer

All neonates born through meconium-stained amniotic fluid should be admitted to the neonatal intensive care unit for at least 6 hours before being discharged to the mother.

Question 9

A newborn is infected in utero with an enveloped virus containing double-stranded DNA. The child develops petechiae, hepatosplenomegaly, and jaundice. Brain calcifications are detected on computed tomography (CT). With which of the following viruses is the newborn most likely infected?

Accepted Answer

Cytomegalovirus

Answer

Hepatitis B

Answer

Hepatitis C

Answer

Hepatitis D

Question 10

A 3-month-old infant presents with profuse lacrimation. Pus exudes from the puncta upon pressure. What is the best line of management?

Accepted Answer

Syringing and probing

Answer

Dacryocystorhinostomy

Answer

Syringing

Answer

Massaging of the lacrimal sac with antibiotics

Neonatology — MCQs

Neonatology — MCQs

On this page

Practice by Chapter

Want unlimited practice?