Labor and Delivery — MCQs

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?

Q484Medium

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

Q485Medium

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

Q486Medium

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

Q487Medium

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

Q488Easy

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

Q489Easy

Bishop's classification is used for what purpose?

Q490Medium

Which of the following fetal presentations is least common?

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 481: What is the indication for Cesarean section in a pregnant lady with HIV infection?

A. Viral load is less than 1000 copies/mL
B. Viral load is greater than 1000 copies/mL (Correct Answer)
C. Viral load is less than 2000 copies/mL
D. Viral load is less than 50-70 copies/mL

Explanation: 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.

Question 482: What is the commonest chromosomal anomaly leading to spontaneous abortions?

A. Trisomy 16 (Correct Answer)
B. Trisomy 21
C. Tetraploidy
D. Turner's syndrome

Explanation: **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).

Question 483: 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?

A. Initiate antihypertensive therapy and then induce labor.
B. Observe for 10 days.
C. Induce labor spontaneously.
D. Perform a caesarean section. (Correct Answer)

Explanation: **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.

Question 484: Which of the following is true regarding a fetus in transverse presentation?

A. Polyhydramnios is a cause (Correct Answer)
B. It can be caused by abruptio placenta
C. It results in hand prolapse in all cases
D. Shoulder dystocia is a major threat

Explanation: **Explanation:** **1. Why Option A is Correct:** Transverse lie occurs when the long axis of the fetus is perpendicular to the long axis of the mother. **Polyhydramnios** is a classic predisposing factor because the excessive amniotic fluid volume creates a large intrauterine space, allowing the fetus too much mobility and preventing it from engaging in a longitudinal lie (cephalic or breech). **2. Analysis of Incorrect Options:** * **Option B:** While placental issues like **Placenta Previa** are major causes of transverse lie (as the placenta occupies the lower uterine segment, preventing the head from entering the pelvis), **Abruptio Placenta** is a complication or a result of sudden uterine decompression, not a primary cause of the malpresentation itself. * **Option C:** While **hand prolapse** (compound presentation) is a common complication of transverse lie once the membranes rupture, it does **not** occur in all cases. The arm prolapses in approximately 10–20% of cases, particularly in "neglected shoulder" presentations. * **Option D:** **Shoulder dystocia** is a complication of a **cephalic (head-first)** delivery where the anterior shoulder gets stuck behind the pubic symphysis. In a transverse lie, the "threat" is not shoulder dystocia, but rather **cord prolapse** or **obstructed labor** leading to uterine rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Multiparity (due to lax abdominal and uterine muscles). * **Management:** If diagnosed in early labor with intact membranes, **External Cephalic Version (ECV)** can be attempted. However, the definitive mode of delivery for a persistent transverse lie at term is **Cesarean Section**. * **Neglected Shoulder Presentation:** This occurs when membranes rupture, the arm prolapses, and the uterus contracts vigorously around the fetus, leading to an impending uterine rupture (Bandl’s ring). * **Spontaneous Evolution:** Rare mechanisms like *Spontaneous Evolution (Douglas)* or *Spontaneous Version* are only possible with a very small/macerated fetus and a large pelvis.

Question 485: Shoulder dystocia is predominantly seen in which of the following conditions?

A. Transverse lie
B. Hand prolapse
C. Anencephaly (Correct Answer)
D. Cord around neck

Explanation: **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).

Question 486: What percentage of occipitoposterior positions spontaneously convert to the occipitoanterior position and deliver comfortably?

A. 3-4%
B. 15-16%
C. 20-25%
D. 75-80% (Correct Answer)

Explanation: **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.

Question 487: All of the following are to be monitored during Magnesium sulfate prophylaxis in impending eclampsia, EXCEPT:

A. Patellar reflex
B. Respiratory Rate
C. Urine output
D. Serum magnesium level (Correct Answer)

Explanation: **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 <12–14/min) occurs at levels of 11–15 mEq/L. * **Urine output (C):** Since $MgSO_4$ is 100% renally excreted, adequate output (>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.

Question 488: In complete breech presentation, what is the typical fetal attitude maintained?

A. Universal flexion (Correct Answer)
B. Universal extension
C. Flexion at the hip and extension at the knee
D. Extension of the hip and flexion of the knee

Explanation: 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.

Question 489: Bishop's classification is used for what purpose?

A. Progress of labor
B. Requirement of induction for labor (Correct Answer)
C. Gestational age of fetus
D. Fetal well-being

Explanation: **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 490: Which of the following fetal presentations is least common?

A. Frank breech
B. Transverse lie (Correct Answer)
C. Footling presentation
D. Brow presentation

Explanation: This question tests your knowledge of the incidence of various fetal lies and presentations at term. **Explanation of the Correct Answer:** The **Transverse lie** is the least common among the options provided. In a transverse lie, the long axis of the fetus is perpendicular to that of the mother. At term, the incidence of transverse lie is approximately **0.3% to 0.5%**. It is considered an unstable lie and is a high-risk condition often associated with prematurity, placenta previa, or pelvic contraction. **Analysis of Incorrect Options:** * **Frank Breech (A):** This is the most common type of breech presentation (approx. 60-70% of all breeches). Overall, breech presentation occurs in about 3-4% of deliveries at term, making it significantly more common than a transverse lie. * **Footling Presentation (C):** This is a type of incomplete breech where one or both feet are the presenting part. While less common than frank breech, it still falls under the 3-4% umbrella of breech presentations, occurring more frequently than the rare transverse lie. * **Brow Presentation (D):** This is a rare malpresentation where the head is midway between full flexion and full extension. Its incidence is approximately **1 in 1500 (0.06%)**. *Note on the Question Logic:* While Brow presentation is statistically rarer than Transverse lie in some textbooks, in the context of standard NEET-PG patterns and the provided key, **Transverse Lie** is categorized as the least common "Lie," whereas Brow is a "Presentation." Among the major categories of fetal orientation, the transverse lie is the rarest stable clinical finding at the onset of labor. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** Vertex (95%). * **Most common position:** Left Occipito-Anterior (LOA). * **Transverse Lie Management:** External Cephalic Version (ECV) can be attempted if there are no contraindications; otherwise, Cesarean Section is mandatory if the lie remains transverse at labor. * **Risk Factor:** Multiparity is the most common cause of transverse lie due to lax abdominal and uterine muscles.

Practice by Chapter

Physiology of Labor

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Stages of Labor and Normal Progression

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Fetal Monitoring Techniques

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Pain Management in Labor

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Induction and Augmentation of Labor

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Operative Delivery (Forceps and Vacuum)

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Cesarean Section: Indications and Techniques

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Dystocia and Abnormal Labor Patterns

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Obstetric Emergencies

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Postpartum Hemorrhage Management

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