Birth Injuries — MCQs
All are complications of vacuum-assisted delivery over forceps delivery except:
Which of the following is not a cause of neonatal anaemia?
Which of the following is NOT a characteristic of caput succedaneum?
A 6-week-old boy is brought to the pediatrician. His parents report that he has not had significant use of his right arm since birth. Birth history is significant for a prolonged labor with difficult breech delivery. On physical examination, his arm hangs at his side and is in a medially rotated position with the forearm in pronation. He will actively use his left arm but does not move his affected right arm or hand. Injury to which of the following cervical nerve roots accounts for this patient's posture?
What is the treatment for a baby brought to the clinic with a history of hair fall and a boggy scalp with easily pluckable hair, with a similar history occurring six months prior?
A confirmatory scan should be performed at what time in a G2P1 female detected with major placenta previa at 28 weeks on ultrasound (TVS).
Erythroblastosis fetalis can be prevented if the mother is injected with an antibody called?
Hypoxia induced metabolic acidemia is when?
A 26-year-old primigravida develops gestational diabetes and remains hyperglycemic during the remainder of her pregnancy. Which of the following abnormalities in the newborn child is likely related to the maternal hyperglycemia?
At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?
Birth Injuries Indian Medical PG Practice Questions and MCQs
Question 1: All are complications of vacuum-assisted delivery over forceps delivery except:
- A. Subgaleal hematoma
- B. Intracranial hemorrhage
- C. Cephalohematoma
- D. Transient lateral rectus palsy (Correct Answer)
Explanation: ***Transient lateral rectus palsy*** - **Transient sixth nerve palsy** (lateral rectus palsy) in a neonate is **more commonly associated with forceps delivery**, not vacuum-assisted delivery. - This occurs due to **direct compression of the fetal head** during forceps application, particularly compression of the sixth cranial nerve [4]. - It is **NOT a typical complication of vacuum-assisted delivery over forceps delivery**, making it the correct answer to this EXCEPT question. *Subgaleal hematoma* - This is a **serious and specific complication of vacuum-assisted delivery**, occurring when blood collects in the space between the **galeal aponeurosis** and the **periosteum** [1]. - It is **more common with vacuum extraction than forceps delivery**. - Can lead to significant **blood loss** and **hypovolemic shock** in the neonate. *Intracranial hemorrhage* - **Vacuum extraction is associated with higher rates** of intracranial hemorrhage compared to forceps delivery [1]. - The suction and traction forces can lead to **subdural hemorrhage**, **subarachnoid hemorrhage**, and other intracranial bleeding [2]. - Studies show increased risk with vacuum compared to forceps delivery. *Cephalohematoma* - A **cephalohematoma** (blood collection between **periosteum** and skull bone) is a **classic and common complication of vacuum-assisted delivery** [3]. - It is **more frequent with vacuum extraction than forceps delivery** due to the suction cup causing subperiosteal bleeding. - Resolves spontaneously over weeks to months.
Question 2: Which of the following is not a cause of neonatal anaemia?
- A. Subgaleal Hemorrhage
- B. Abruptio placentae
- C. Wilson's Disease (Correct Answer)
- D. Diamond Blackfan syndrome
Explanation: ***Wilson's Disease*** - Wilson's disease is a disorder of **copper metabolism** that typically manifests later in childhood or adolescence with **hepatic**, **neurological**, or **psychiatric symptoms**, not neonatal anemia. - While it can cause hemolytic anemia in older individuals due to copper toxicity, it is not a recognized cause of **neonatal anemia**. *Subgaleal Hemorrhage* - A subgaleal hemorrhage is a significant collection of blood in the **subgaleal space** of the scalp, which can lead to substantial **blood loss** and subsequent **neonatal anemia** due to a large potential space. - This type of hemorrhage is often associated with **vacuum extraction** or other traumatic deliveries. *Abruptio placentae* - **Abruptio placentae** involves the premature separation of the placenta from the uterine wall, leading to **fetal-maternal hemorrhage** and sometimes significant **fetal blood loss**. - This acute blood loss in the fetus can manifest as severe **neonatal anemia** at birth. *Diamond Blackfan syndrome* - **Diamond Blackfan syndrome** is a congenital red cell aplasia characterized by a failure of **red blood cell production** in the bone marrow. - This condition presents with severe **macrocytic anemia** early in infancy, often requiring transfusions.
Question 3: Which of the following is NOT a characteristic of caput succedaneum?
- A. Crosses the suture line
- B. Crosses midline
- C. It does not disappear within 2-3 days (Correct Answer)
- D. It is a diffuse edematous swelling of the soft tissues of the scalp
Explanation: ***It does not disappear within 2-3 days*** - Caput succedaneum is a benign condition that typically resolves within **2 to 3 days** after birth as the edema is reabsorbed. - Therefore, a characteristic of caput succedaneum is that it *does* disappear relatively quickly, making the statement that it "does not disappear within 2-3 days" incorrect. *Crosses midline* - Caput succedaneum is a **diffuse swelling** that extends across the scalp and is **not limited by anatomical boundaries** like the midline of the skull. - This characteristic helps differentiate it from a **cephalohematoma**, which is typically confined to one side of the head. *Crosses the suture line* - The edema of caput succedaneum is in the **soft tissues superficial to the periosteum**, allowing it to **cross the suture lines** of the skull. - This is a key differentiating feature from a **cephalohematoma**, which is a subperiosteal hemorrhage and therefore confined by suture lines. *It is a diffuse edematous swelling of the soft tissues of the scalp* - This statement accurately describes caput succedaneum as a **collection of serosanguineous fluid** and **edema** in the most superficial layers of the scalp. - It results from pressure on the fetal scalp during labor, leading to **venous congestion** and extravasation of fluid.
Question 4: A 6-week-old boy is brought to the pediatrician. His parents report that he has not had significant use of his right arm since birth. Birth history is significant for a prolonged labor with difficult breech delivery. On physical examination, his arm hangs at his side and is in a medially rotated position with the forearm in pronation. He will actively use his left arm but does not move his affected right arm or hand. Injury to which of the following cervical nerve roots accounts for this patient's posture?
- A. C5 and C6 (Correct Answer)
- B. C7 and C8
- C. C4 and C5
- D. C6 and C7
Explanation: ***C5 and C6*** - The described "waiter's tip" posture – arm adducted, internally rotated, and forearm pronated – is classic for **Erb-Duchenne palsy**, resulting from damage to the **C5 and C6 nerve roots** [1]. - This injury commonly occurs during **difficult deliveries** involving shoulder traction, as seen in **breech presentations** [1]. *C7 and C8* - Damage to **C7 and C8** (and often T1) typically results in **Klumpke's palsy**, affecting the **intrinsic hand muscles** and causing a **claw hand deformity** [1]. - While a difficult birth can cause this, the patient's posture (medially rotated arm, pronated forearm) is not characteristic of Klumpke's palsy, which primarily affects lower brachial plexus elements. *C4 and C5* - Injury to **C4** can affect the **diaphragm** via the phrenic nerve, and along with C5, would primarily cause weakness of the **shoulder abductors** and **external rotators**. - While C5 is involved in the observed posture, isolated C4-C5 injury does not fully explain the severe adduction and internal rotation with forearm pronation that defines Erb's palsy. *C6 and C7* - Involvement of **C6 and C7** would lead to weakness in wrist extension, finger extension, and some elbow flexion. - While C6 is involved in Erb's palsy, the additional involvement of C7 alone would alter the specific presentation, often leading to more prominent wrist and finger extensor weakness, which is not the dominant feature described.
Question 5: What is the treatment for a baby brought to the clinic with a history of hair fall and a boggy scalp with easily pluckable hair, with a similar history occurring six months prior?
- A. Oral ketoconazole
- B. Oral griseofulvin (Correct Answer)
- C. Intralesional steroid
- D. Topical cotrimoxazole
Explanation: **Oral griseofulvin** - This presentation describes **tinea capitis**, a fungal infection of the scalp, characterized by **hair fall**, a **boggy scalp** (kerion), and **easily pluckable hair**. - **Oral griseofulvin** is the first-line and most effective systemic antifungal treatment for tinea capitis, particularly in children, due to its fungistatic action and accumulation in keratinized tissues. *Oral ketoconazole* - While an antifungal, **oral ketoconazole** is generally not recommended as the first-line treatment for tinea capitis in children due to concerns about **hepatotoxicity** and potential drug interactions. - **Griseofulvin** has a better safety profile and established efficacy for this condition. *Topical cotrimoxazole* - **Cotrimoxazole** is an antibiotic, not an antifungal, and thus would be ineffective against a fungal infection like tinea capitis. - Topical treatments alone are generally insufficient for tinea capitis because the infection is deep within the hair follicles. *Intralesional steroid* - **Intralesional steroids** are used to reduce inflammation in certain dermatological conditions, but they do not treat primary fungal infections. - Their use in tinea capitis, especially in the absence of an antifungal, could worsen the infection or lead to secondary complications due to immunosuppression.
Question 6: A confirmatory scan should be performed at what time in a G2P1 female detected with major placenta previa at 28 weeks on ultrasound (TVS).
- A. At 36 weeks
- B. At onset of labor
- C. At 32 weeks (Correct Answer)
- D. At 34 weeks
Explanation: ***At 32 weeks*** - The **RCOG Green-top Guideline No. 27** and **ACOG guidelines** recommend a confirmatory scan at **32 weeks** for placenta previa detected in the second trimester. - By 32 weeks, the **lower uterine segment** has developed sufficiently to accurately assess whether the placenta previa has resolved or persists. - This timing allows adequate time for **delivery planning** if the previa persists, including scheduling elective cesarean section and arranging appropriate resources. - Approximately **90% of low-lying placentas** identified at 20 weeks will have resolved by 32 weeks due to the development of the lower segment. *At 34 weeks* - While this provides a later assessment, it is **not the standard recommended timing** according to international guidelines. - Delaying the confirmatory scan to 34 weeks reduces the time available for optimal **delivery planning and counseling** if the previa persists. - The standard protocol is 32 weeks for confirmation, with a possible additional scan at 36 weeks if needed for final delivery planning. *At 36 weeks* - This is often used as a **final pre-delivery assessment** if placenta previa persists at 32 weeks, not as the initial confirmatory scan. - Waiting until 36 weeks for the first confirmatory scan may be too late for optimal management, especially if the patient experiences **antepartum hemorrhage**. - By guideline recommendations, 36 weeks is the timing for determining the **exact mode and timing of delivery**, not the initial confirmation. *At onset of labor* - This is a **dangerous approach** that could lead to catastrophic hemorrhage for both mother and fetus. - **Vaginal examination** in the presence of placenta previa can cause severe bleeding and is contraindicated. - Placenta previa requires **planned cesarean section**, which must be arranged well in advance based on earlier ultrasound confirmation, not determined at labor onset.
Question 7: Erythroblastosis fetalis can be prevented if the mother is injected with an antibody called?
- A. Blocking antibody
- B. Rh (D) immunoglobulin (Correct Answer)
- C. Antilymphocyte globulin
- D. Antithymocyte serum
Explanation: **Explanation:** **Erythroblastosis fetalis** (Hemolytic Disease of the Newborn) occurs when an Rh-negative mother is sensitized to Rh-positive fetal red blood cells (RBCs), leading to the production of maternal IgG antibodies that cross the placenta and destroy fetal erythrocytes. **Why Rh (D) Immunoglobulin is correct:** The administration of **Rh (D) immunoglobulin (Anti-D)** is the standard preventive measure. It contains high titers of antibodies against the Rh(D) antigen. When injected into the mother, these antibodies bind to and neutralize any fetal Rh-positive RBCs in the maternal circulation before her immune system can recognize them and initiate an active immune response (isoimmunization). This is a form of **passive immunization**. **Why the other options are incorrect:** * **A. Blocking antibody:** While Anti-D acts by "blocking" the antigen sites, the term is non-specific. In immunology, blocking antibodies usually refer to IgG antibodies that compete with IgE in allergic reactions. * **C & D. Antilymphocyte globulin (ALG) and Antithymocyte serum (ATS):** These are potent immunosuppressants used primarily in organ transplantation and aplastic anemia to prevent graft rejection by depleting T-cells. They play no role in preventing Rh isoimmunization. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Dose:** 300 mcg (1500 IU) of Anti-D can neutralize **30 ml of fetal whole blood** or 15 ml of packed RBCs. * **Timing:** Administered routinely at **28 weeks gestation** and within **72 hours of delivery** (if the neonate is Rh-positive). * **Kleihauer-Betke Test:** Used to quantify the volume of fetomaternal hemorrhage to determine if additional doses of Anti-D are required. * **Indirect Coombs Test (ICT):** Used to screen the mother for sensitization. Anti-D is only effective if the mother is **not** already sensitized (ICT negative).
Question 8: Hypoxia induced metabolic acidemia is when?
- A. Umbilical artery blood pH < 7.00 (Correct Answer)
- B. HCO3 - concentration > 17.7 mmol/L
- C. Base deficit < 12 mmol/L
- D. None of the above
Explanation: **Explanation:** The diagnosis of **hypoxia-induced metabolic acidemia** (often termed "pathological acidemia") is a critical marker in neonatology used to define birth asphyxia and predict potential neurological sequelae like Hypoxic-Ischemic Encephalopathy (HIE). **1. Why Option A is Correct:** According to the American College of Obstetricians and Gynecologists (ACOG) and the American Academy of Pediatrics (AAP), the threshold for clinically significant metabolic acidemia is an **umbilical artery blood pH < 7.00**. A pH above this level is rarely associated with adverse neurological outcomes. **2. Why the Other Options are Incorrect:** * **Option B:** In metabolic acidemia, bicarbonate (HCO₃⁻) levels are **decreased**, not increased. A concentration > 17.7 mmol/L is relatively normal; pathological acidemia typically involves significantly lower levels as bicarbonate is consumed to buffer the excess lactic acid. * **Option C:** The criteria for metabolic acidemia require a **Base Deficit ≥ 12 mmol/L**. A base deficit *less* than 12 mmol/L (e.g., 8 or 10) indicates a milder state that does not meet the formal definition of severe metabolic acidemia. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Umbilical **arterial** blood gas (ABG) is more reflective of fetal status than venous blood. * **The "Rule of 7 & 12":** For a diagnosis of birth asphyxia, you need a pH **< 7.00** AND a Base Deficit **≥ 12 mmol/L**. * **Lactate:** Elevated lactate levels (> 6 mmol/L) are also used as an early indicator of anaerobic metabolism due to hypoxia. * **Associated Findings:** To label a case as "Birth Asphyxia," the acidemia must be accompanied by an Apgar score of 0–3 for > 5 minutes and evidence of multisystem organ dysfunction.
Question 9: A 26-year-old primigravida develops gestational diabetes and remains hyperglycemic during the remainder of her pregnancy. Which of the following abnormalities in the newborn child is likely related to the maternal hyperglycemia?
- A. Ambiguous genitalia
- B. Cretinism
- C. Increased birth weight (Correct Answer)
- D. Sheehan syndrome
Explanation: **Explanation:** The correct answer is **C. Increased birth weight (Macrosomia).** **Pathophysiology:** The underlying mechanism is explained by the **Pedersen Hypothesis**. Maternal hyperglycemia leads to fetal hyperglycemia because glucose crosses the placenta via facilitated diffusion. In response, the fetal pancreas undergoes islet cell hyperplasia and secretes excess insulin (fetal hyperinsulinemia). Since insulin is a potent anabolic hormone and a structural analogue of Insulin-like Growth Factor (IGF-1), it promotes excessive deposition of fat and glycogen in fetal tissues, leading to **macrosomia** (birth weight >4000g or >90th percentile). **Analysis of Incorrect Options:** * **A. Ambiguous genitalia:** This is typically caused by Congenital Adrenal Hyperplasia (CAH) or chromosomal abnormalities, not maternal glucose levels. * **B. Cretinism:** This results from untreated congenital hypothyroidism (iodine deficiency or thyroid dysgenesis), not maternal diabetes. * **D. Sheehan syndrome:** This is a maternal complication involving postpartum pituitary necrosis due to severe obstetric hemorrhage; it does not occur in the newborn. **NEET-PG High-Yield Pearls:** * **Most common cardiac anomaly** in infants of diabetic mothers (IDM): Hypertrophic Cardiomyopathy (specifically asymmetric septal hypertrophy). * **Most specific anomaly:** Caudal Regression Syndrome (Sacral agenesis). * **Metabolic complications in IDM:** Hypoglycemia (due to persistent hyperinsulinemia after cord clamping), Hypocalcemia, Hypomagnesemia, and Polycythemia. * **Respiratory:** Increased risk of Respiratory Distress Syndrome (RDS) because hyperinsulinemia inhibits surfactant production by type II pneumocytes.
Question 10: At the time of delivery, a growth-restricted fetus would be prone to all of the following neonatal complications except?
- A. Meconium aspiration
- B. Hypothermia
- C. Hyperglycemia (Correct Answer)
- D. Polycythemia
Explanation: **Explanation:** The correct answer is **C. Hyperglycemia**. In fact, growth-restricted fetuses (Fetal Growth Restriction - FGR/IUGR) are prone to **Hypoglycemia**, not hyperglycemia. **Why Hyperglycemia is incorrect (The Medical Concept):** Growth-restricted fetuses have chronic placental insufficiency, leading to poor nutrient transfer. Consequently, they have **depleted glycogen stores** in the liver and heart, and diminished subcutaneous fat (reduced glycerol for gluconeogenesis). Post-delivery, they cannot maintain blood glucose levels, making hypoglycemia a hallmark neonatal complication. **Analysis of other options:** * **Meconium Aspiration (A):** Chronic hypoxia in utero triggers vagal stimulation, leading to the passage of meconium. Combined with reduced amniotic fluid (oligohydramnios), the risk of thick meconium aspiration syndrome (MAS) is high. * **Hypothermia (B):** These neonates have a high surface-area-to-body-mass ratio and lack **brown fat** and subcutaneous adipose tissue, which are essential for non-shivering thermogenesis. * **Polycythemia (D):** Chronic intrauterine hypoxia stimulates fetal **erythropoietin** production, leading to an increased red cell mass (polycythemia) to compensate for low oxygen levels. This can result in hyperviscosity syndrome. **NEET-PG High-Yield Pearls:** * **Ponderal Index:** Used to differentiate between Symmetrical and Asymmetrical IUGR. * **Commonest cause of Asymmetrical IUGR:** Placental insufficiency (e.g., Preeclampsia). * **Other complications:** Hypocalcemia (due to relative hypoparathyroidism) and Pulmonary Hemorrhage. * **Rule of thumb:** IUGR babies are "Small but Mature," meaning they often have accelerated lung maturity due to chronic stress (increased steroids), reducing the risk of RDS compared to preterm infants of the same weight.
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