Labor and Delivery Practice Questions

Q: What is the indication for Cesarean section in a pregnant lady with HIV infection?

Viral load is greater than 1000 copies/mL. The primary goal of managing HIV in pregnancy is to minimize **Mother-to-Child Transmission (MTCT)**. The risk of vertical transmission is directly proportional to the maternal plasma viral load near the time of delivery. ### **Explanation of the Correct Answer** **Option B (Viral load > 1000 copies/mL)** is the correct indication for a **Scheduled Prelabor Cesarean Section (PLCS)**, typically performed at 38 weeks of gestation. When the viral load is high (>1000 copies/mL) or unknown, the risk of transmission during vaginal delivery—due to contact with infected cervicovaginal secretions and blood—is significantly high. A C-section performed before the onset of labor and rupture of membranes minimizes this exposure. ### **Explanation of Incorrect Options** * **Options A, C, and D:** If the viral load is **<1000 copies/mL** (and especially if it is "undetectable" at <50 copies/mL), the risk of transmission is extremely low (approx. 1-2%). In these cases, a **planned vaginal delivery** is recommended as the benefits of surgery do not outweigh the risks. ### **High-Yield Clinical Pearls for NEET-PG** * **Timing of Surgery:** Scheduled PLCS for HIV is ideally done at **38 weeks** (to avoid spontaneous labor) rather than the standard 39 weeks. * **Intravenous Zidovudine:** Should be administered 3 hours before surgery if the viral load is >1000 copies/mL. * **Rupture of Membranes (ROM):** The benefit of C-section in reducing MTCT is lost if performed more than 4 hours after ROM. * **Breastfeeding:** In resource-rich settings, it is avoided; however, WHO guidelines for resource-limited settings (like India) suggest exclusive breastfeeding for 6 months if the mother is on ART. * **Avoid:** Scalp electrodes, forceps, or vacuum extraction in HIV-positive patients to prevent fetal scalp trauma.

Q: What is the commonest chromosomal anomaly leading to spontaneous abortions?

Trisomy 16. **Explanation:** Chromosomal anomalies are the most common cause of first-trimester spontaneous abortions, accounting for approximately 50–60% of cases. Among these, **Autosomal Trisomies** are the most frequent category (about 50% of all anomalies). **Why Trisomy 16 is correct:** While Trisomy 21 is the most common trisomy found in live births, **Trisomy 16** is the most common trisomy identified in spontaneous miscarriages. It is considered lethal and is virtually never seen in live-born infants. It accounts for approximately one-third of all trisomies found in abortuses. **Analysis of Incorrect Options:** * **Trisomy 21 (Option B):** This is the most common autosomal trisomy in **live births** (Down Syndrome). While it can cause miscarriage, it is less frequent than Trisomy 16 in early pregnancy loss. * **Tetraploidy (Option C):** This is a polyploidy (92 chromosomes). While it leads to early pregnancy loss, it is much rarer than aneuploidies like trisomy. * **Turner’s Syndrome (Option D):** Monosomy X (45,X) is the **single most common specific chromosomal abnormality** found in spontaneous abortions (accounting for ~20% of cases). However, as a group, **Trisomies** are more common than Monosomy X. If the question asks for the most common *trisomy* or the most common *anomaly* (where trisomies are grouped), Trisomy 16 is the leading specific trisomy. **NEET-PG High-Yield Pearls:** * **Most common cause of spontaneous abortion:** Chromosomal anomalies. * **Most common group of anomalies:** Autosomal Trisomies. * **Most common specific Trisomy:** Trisomy 16. * **Most common single chromosomal anomaly:** Monosomy X (45,X / Turner’s). * **Most common cause of second-trimester abortion:** Maternal factors (e.g., Cervical incompetence, uterine anomalies).

Q: A 37-year-old, gravid 2, with a previous lower segment caesarean section (LSCS) at 37 weeks gestation presents with a blood pressure of 150/100 mmHg and urine albumin++. On pelvic examination, the cervix is soft with 50% effacement, the station is -3, the pelvis is adequate, and the cervical os is closed. What is the most appropriate next step?

Perform a caesarean section.. **Explanation:** The patient is a 37-year-old G2 with a **previous LSCS** presenting at 37 weeks with **Preeclampsia** (BP 150/100 mmHg and proteinuria). The management of preeclampsia at term (≥37 weeks) is delivery. The choice of delivery method depends on the Bishop score and obstetric history. **Why Option D is Correct:** In this case, the patient has a **previous LSCS** and an **unfavorable cervix** (closed os, -3 station, 50% effacement). According to standard obstetric guidelines, induction of labor (IOL) in a patient with a scarred uterus and an unfavorable cervix significantly increases the risk of **uterine rupture** and has a high failure rate. Therefore, a repeat Caesarean Section is the safest and most appropriate management. **Why Other Options are Incorrect:** * **Option A & C:** Induction of labor is contraindicated or highly risky in a patient with a previous scar and an unfavorable cervix (Bishop score <6). Prostaglandins, often used for ripening, are generally avoided in VBAC (Vaginal Birth After Cesarean) due to the risk of rupture. * **Option B:** Observation is inappropriate. At 37 weeks with preeclampsia, the definitive treatment is delivery to prevent maternal and fetal complications (e.g., eclampsia, placental abruption). **Clinical Pearls for NEET-PG:** * **Term Preeclampsia:** Always deliver at 37 weeks regardless of severity. * **VBAC Criteria:** Favorable Bishop score is the most important predictor of success. An unfavorable cervix in a scarred uterus is a strong indication for repeat LSCS. * **Bishop Score:** Components include Dilation, Effacement, Station, Consistency, and Position of the cervix. A score ≤5 is considered unfavorable.

Q: Shoulder dystocia is predominantly seen in which of the following conditions?

Anencephaly. **Explanation:** The correct answer is **Anencephaly**. **Why Anencephaly?** In a normal delivery, the head is the largest part of the fetus. Once the head is born, it dilates the birth canal sufficiently for the shoulders to follow. In **anencephaly**, there is a developmental absence of the cranial vault and brain tissue. Consequently, the head is small and underdeveloped (rudimentary), failing to adequately dilate the cervix and maternal soft tissues. When the broad, well-developed shoulders reach the pelvic inlet, they encounter an undilated birth canal, leading to **shoulder dystocia**. This is a classic "high-yield" paradox where a smaller head leads to more difficult shoulder delivery. **Analysis of Incorrect Options:** * **A. Transverse lie:** This is a malpresentation where the long axis of the fetus is perpendicular to the mother. Delivery is impossible vaginally; therefore, shoulder dystocia (a complication of vaginal delivery) is not the primary concern here. * **B. Hand prolapse:** This often occurs with transverse lie or compound presentation. While it complicates labor, it does not inherently cause the mechanical bony impaction of the shoulders against the pubic symphysis. * **D. Cord around neck:** A nuchal cord may cause fetal distress or failure to descend, but it does not change the diameter of the shoulders or the dilation of the birth canal. **Clinical Pearls for NEET-PG:** * **Definition:** Shoulder dystocia is the failure of the shoulders to deliver after the head, requiring additional maneuvers. * **Most common cause:** Fetal macrosomia (often associated with maternal diabetes). * **The Anencephaly Paradox:** Small head → inadequate cervical/vaginal dilation → shoulder impaction. * **Management:** Remember the **HELPERR** mnemonic (H-Call for Help, E-Episiotomy, L-Legs/McRoberts, P-Suprapubic Pressure, E-Enter/Internal rotation, R-Remove posterior arm, R-Roll the patient).

Q: What percentage of occipitoposterior positions spontaneously convert to the occipitoanterior position and deliver comfortably?

75-80%. **Explanation:** The **Occipitoposterior (OP)** position is the most common malposition encountered during labor. While it occurs in approximately 15–25% of cases at the onset of labor, the majority of these cases undergo **spontaneous long internal rotation** (135°) to the Occipitoanterior (OA) position. **1. Why 75-80% is correct:** During the second stage of labor, as the fetal head reaches the pelvic floor, the resistance of the levator ani muscles promotes rotation. In approximately **75-80%** of cases, the occiput rotates anteriorly to the OA position, leading to a normal vaginal delivery. This is the natural mechanism of labor for OP positions. **2. Why the other options are incorrect:** * **A (3-4%):** This represents the incidence of **Persistent Occipitoposterior (POP)** position—where the head fails to rotate and remains OP at the time of delivery. * **B (15-16%):** This is closer to the initial incidence of OP position at the *onset* of labor, but it does not account for the high rate of subsequent rotation. * **C (20-25%):** This range often describes the incidence of OP in early labor or the percentage of cases that may require operative intervention (vacuum/forceps/CS) due to failure of rotation. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Rotation occurs through a **long arc of 135°** (compared to 45° in OA). * **Clinical Sign:** On per-vaginal exam, the **anterior fontanelle** (diamond-shaped) is felt behind the symphysis pubis, and the **sagittal suture** is in the oblique diameter. * **Complications:** If rotation fails, it may result in **Deep Transverse Arrest** (rotation stops at 90°) or **Persistent OP** (Face-to-Pubis delivery). * **Management:** If the pelvis is adequate and the head is low, a "Face-to-Pubis" delivery is possible, though it results in a larger diameter (11.5 cm) distending the perineum, increasing the risk of 3rd-degree tears.

Q: All of the following are to be monitored during Magnesium sulfate prophylaxis in impending eclampsia, EXCEPT:

Serum magnesium level. **Explanation:** Magnesium sulfate ($MgSO_4$) is the drug of choice for seizure prophylaxis in pre-eclampsia and control in eclampsia. It is primarily excreted by the kidneys and has a narrow therapeutic index. Therefore, monitoring for **magnesium toxicity** is mandatory. **Why Serum Magnesium Level is the Correct Answer:** Routine monitoring of serum magnesium levels is **not required** during prophylaxis. Clinical monitoring of bedside parameters is sufficient and more practical. Serum levels are only indicated if the patient has renal impairment (Serum Creatinine >1.0 mg/dL), if clinical signs of toxicity appear, or if seizures recur despite treatment. The therapeutic range is 4–7 mEq/L, while toxicity begins when levels exceed 7–10 mEq/L. **Why the other options are monitored (Clinical Monitoring):** Clinical signs of toxicity follow a predictable sequence, which must be monitored every 2–4 hours: * **Patellar reflex (A):** Loss of deep tendon reflexes (knee jerk) is the **earliest sign** of toxicity (occurs at 7–10 mEq/L). $MgSO_4$ must be stopped if the reflex is absent. * **Respiratory Rate (B):** Magnesium causes neuromuscular blockade. Respiratory depression (RR 30 ml/hr or 100 ml/4 hours) ensures the drug does not accumulate to toxic levels. **High-Yield Clinical Pearls for NEET-PG:** * **Antidote:** 10 ml of 10% **Calcium Gluconate** IV (administered slowly over 10 minutes). * **Pritchard Regimen:** 4g IV + 10g IM (loading), followed by 5g IM every 4 hours (maintenance). * **Zuspan Regimen:** 4g IV (loading), followed by 1-2g/hr IV infusion (maintenance). * **Therapeutic Range:** 4–7 mEq/L (or 4.8–8.4 mg/dL). * **Cardiac Arrest:** Occurs at levels >25 mEq/L.

Q: In complete breech presentation, what is the typical fetal attitude maintained?

Universal flexion. In a **Complete Breech** (also known as Flexed Breech), the fetus maintains the **Universal Flexion** attitude, which is the normal physiological posture of the fetus in utero. ### Why Option A is Correct In a complete breech, the fetal attitude is characterized by: * **Flexion at the hip joints.** * **Flexion at the knee joints.** This results in the buttocks and the feet both presenting at the internal os. This is most commonly seen in multiparous women. ### Why Other Options are Incorrect * **Option B (Universal extension):** This is not a standard fetal attitude. Extension of the head occurs in face presentations, but universal extension is incompatible with normal vaginal delivery. * **Option C (Flexion at hip, extension at knee):** This describes a **Frank Breech**. This is the most common type of breech presentation (especially in primigravidae) where the legs are extended against the trunk and the feet lie near the face. * **Option D (Extension of hip, flexion of knee):** This describes a **Footling Breech**, where one or both hips are extended, and the foot (or feet) is the presenting part below the level of the buttocks. ### High-Yield NEET-PG Pearls * **Most common breech:** Frank Breech (especially at term). * **Best prognosis for vaginal delivery:** Frank Breech (the buttocks act as a good dilating wedge). * **Highest risk of Cord Prolapse:** Footling Breech (due to the irregular presenting part not filling the lower uterine segment). * **Prerequisite for Breech:** The "Bitrochanteric diameter" (10 cm) is the engaging diameter in breech presentation. * **Management:** External Cephalic Version (ECV) is typically offered at 36 weeks in primigravidae and 37 weeks in multiparae.

Q: Bishop's classification is used for what purpose?

Requirement of induction for labor. **Explanation:** The **Bishop Score** (also known as the Pelvic Score) is a pre-induction scoring system used to predict the likelihood of a successful vaginal delivery following the **induction of labor**. It assesses the "ripeness" of the cervix; a higher score indicates a cervix that is favorable for labor, while a lower score suggests a higher risk of failed induction and potential need for a Cesarean section. **Why Option B is Correct:** The primary clinical utility of the Bishop score is to determine if induction is required and, more importantly, which method to use. * **Score ≥ 8:** The cervix is "ripe" (favorable), and the probability of vaginal delivery is similar to spontaneous labor. * **Score ≤ 6:** The cervix is "unripe" (unfavorable), indicating a need for cervical ripening agents (like PGE2 gel or Misoprostol) before starting Oxytocin. **Why Other Options are Incorrect:** * **A. Progress of labor:** This is monitored using a **Partograph**, which tracks cervical dilation, fetal descent, and uterine contractions over time. * **C. Gestational age of fetus:** This is determined by the Last Menstrual Period (LMP) or **Ultrasonography** (CRL in the first trimester is most accurate). * **D. Fetal well-being:** This is assessed via the **Non-Stress Test (NST)**, Biophysical Profile (BPP), or Cardiotocography (CTG). **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Components:** **"S-P-A-D-E"** (Station, Position, Atfacement/Effacement, Dilatation, Consistency). * **Modified Bishop Score:** Replaces "effacement" with "cervical length" (in cm). * **Most important parameter:** Cervical **Dilatation** is often considered the most critical individual component, though the total score is what guides management.

Question 1

What is the indication for Cesarean section in a pregnant lady with HIV infection?

Accepted Answer

Viral load is greater than 1000 copies/mL

Answer

Viral load is less than 1000 copies/mL

Answer

Viral load is less than 2000 copies/mL

Answer

Viral load is less than 50-70 copies/mL

Question 2

What is the commonest chromosomal anomaly leading to spontaneous abortions?

Accepted Answer

Trisomy 16

Answer

Trisomy 21

Answer

Tetraploidy

Answer

Turner's syndrome

Question 3

A 37-year-old, gravid 2, with a previous lower segment caesarean section (LSCS) at 37 weeks gestation presents with a blood pressure of 150/100 mmHg and urine albumin++. On pelvic examination, the cervix is soft with 50% effacement, the station is -3, the pelvis is adequate, and the cervical os is closed. What is the most appropriate next step?

Accepted Answer

Perform a caesarean section.

Answer

Initiate antihypertensive therapy and then induce labor.

Answer

Observe for 10 days.

Answer

Induce labor spontaneously.

Question 4

Which of the following is true regarding a fetus in transverse presentation?

Accepted Answer

Polyhydramnios is a cause

Answer

It can be caused by abruptio placenta

Answer

It results in hand prolapse in all cases

Answer

Shoulder dystocia is a major threat

Question 5

Shoulder dystocia is predominantly seen in which of the following conditions?

Accepted Answer

Anencephaly

Answer

Transverse lie

Answer

Hand prolapse

Answer

Cord around neck

Question 6

What percentage of occipitoposterior positions spontaneously convert to the occipitoanterior position and deliver comfortably?

Accepted Answer

75-80%

Answer

3-4%

Answer

15-16%

Answer

20-25%

Question 7

All of the following are to be monitored during Magnesium sulfate prophylaxis in impending eclampsia, EXCEPT:

Accepted Answer

Serum magnesium level

Answer

Patellar reflex

Answer

Respiratory Rate

Answer

Urine output

Question 8

In complete breech presentation, what is the typical fetal attitude maintained?

Accepted Answer

Universal flexion

Answer

Universal extension

Answer

Flexion at the hip and extension at the knee

Answer

Extension of the hip and flexion of the knee

Question 9

Bishop's classification is used for what purpose?

Accepted Answer

Requirement of induction for labor

Answer

Progress of labor

Answer

Gestational age of fetus

Answer

Fetal well-being

Question 10

Which of the following fetal presentations is least common?

Accepted Answer

Transverse lie

Answer

Frank breech

Answer

Footling presentation

Answer

Brow presentation

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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