Neonatology Practice Questions

Q: Which statement is not true about cephalohaematoma?

Not limited by sutures. **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).

Q: 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?

Eosinophils. ### 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.

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

Brachial artery. **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 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.

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

Opioids. **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.

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

To differentiate cardiac from non-cardiac cause of cyanosis. **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%.

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

Prevention of hemorrhagic disease of the newborn. **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.

Q: 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?

7. ### 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.

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

Apnoea duration less than 20 seconds. **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.

Question 1

Which statement is not true about cephalohaematoma?

Accepted Answer

Not limited by sutures

Answer

Swelling subsides in 3 months

Answer

Caused by periosteal injury of the skull

Answer

None of the above

Question 2

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?

Accepted Answer

Eosinophils

Answer

Basophils

Answer

Neutrophils

Answer

Monocytes

Question 3

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

Accepted Answer

Brachial artery

Answer

Femoral artery

Answer

Radial artery

Answer

Carotid artery

Question 4

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

Accepted Answer

Opioids

Answer

Barbiturates

Answer

Diazepam

Answer

Propofol

Question 5

Which of the following is NOT a use of pulse oximetry?

Accepted Answer

To differentiate cardiac from non-cardiac cause of cyanosis

Answer

To check for apnea

Answer

To confirm presence of cyanosis

Answer

In the delivery room for resuscitation of a neonate

Question 6

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

Accepted Answer

Prevention of hemorrhagic disease of the newborn

Answer

Prevention of necrotizing enterocolitis

Answer

Prevention of neonatal seizures

Answer

Prevention of neonatal tetanus

Question 7

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

Accepted Answer

Induce bilirubin conjugation by UDP Glucuronyltransferase and competitive inhibition of hemeoxygenase

Answer

Enhance secretion of conjugated bilirubin and induce bilirubin conjugation by UDP Glucuronyltransferase

Answer

Induce bilirubin conjugation by UDP Glucuronyltransferase and enhance secretion of conjugated bilirubin

Answer

Competitive inhibition of hemeoxygenase and enhance secretion of conjugated bilirubin

Question 8

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?

Accepted Answer

7

Answer

5

Answer

6

Answer

8

Question 9

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?

Accepted Answer

Congenital diaphragmatic hernia

Answer

Transient tachypnea of the newborn

Answer

Congenital adenomatoid lung disease

Answer

Sequestration of the lung

Question 10

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

Accepted Answer

Apnoea duration less than 20 seconds

Answer

Associated with bradycardia

Answer

Leads to hypoxia

Answer

May cause cyanosis

Neonatology — MCQs

Neonatology — MCQs

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