Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 761: In post-term pregnancy, what is the increased risk for the fetus, excluding one option?

A. Postpartum hemorrhage (Correct Answer)
B. Meconium aspiration syndrome
C. Intracranial hemorrhage
D. Placental insufficiency leading to fetal hypoxia

Explanation: **Explanation:** The question asks to identify the option that is **not** a direct fetal risk of post-term pregnancy (defined as ≥42 weeks of gestation). **1. Why Postpartum Hemorrhage (PPH) is the correct answer:** Postpartum hemorrhage is a **maternal complication**, not a fetal one. While post-term pregnancy increases the risk of PPH (often due to macrosomia causing uterine atony or extensive perineal tears), it does not represent a direct risk to the fetus itself. **2. Analysis of Fetal Risks (Incorrect Options):** * **Meconium Aspiration Syndrome (MAS):** As the fetus matures, motilin levels increase, leading to increased bowel peristalsis and passage of meconium. Combined with reduced amniotic fluid (oligohydramnios), the meconium becomes thick, significantly increasing the risk of aspiration. * **Intracranial Hemorrhage:** Post-term fetuses often have increased birth weight (macrosomia) and advanced bone ossification of the skull. This leads to reduced molding during labor, increasing the risk of birth trauma and intracranial hemorrhage during a difficult vaginal delivery. * **Placental Insufficiency:** The placenta has a finite lifespan. After 40-42 weeks, "placental senescence" occurs, characterized by infarctions and calcifications. This reduces oxygen and nutrient transfer, leading to fetal hypoxia and potentially stillbirth. **High-Yield Clinical Pearls for NEET-PG:** * **Post-term Definition:** Pregnancy extending to or beyond 42 weeks (294 days). * **Most Common Cause:** Incorrect dating (wrong LMP). * **Dysmaturity Syndrome (Post-maturity):** Seen in 20% of post-term neonates; characterized by loss of subcutaneous fat, wrinkled skin (parchment-like), and long nails. * **Management:** Induction of labor is generally recommended between 41 and 42 weeks to reduce perinatal morbidity.

Question 762: What is the risk of scar rupture in a previous lower segment cesarean section (LSCS)?

A. 1% (Correct Answer)
B. 5%
C. 10%
D. 50%

Explanation: **Explanation:** The risk of uterine scar rupture is a critical consideration when planning a Trial of Labor After Cesarean (TOLAC). For a patient with one previous **Lower Segment Cesarean Section (LSCS)**, the risk of rupture is approximately **0.5% to 1%**. **1. Why Option A is Correct:** The lower uterine segment is relatively thin and contains less muscular tissue compared to the upper segment. During a previous LSCS, the transverse incision heals well and is subjected to less tension during subsequent labor contractions. Large-scale clinical studies (such as those by ACOG and RCOG) consistently cite the risk of rupture for a single low-transverse scar at roughly 0.7–0.9%, making **1%** the most accurate representative figure for exams. **2. Why Other Options are Incorrect:** * **Option B (5%):** This is too high for a standard LSCS. However, the risk increases to approximately 2–3% if the patient has two previous LSCS scars. * **Option C (10%):** This range is associated with a **Classical Cesarean Section** scar (vertical incision in the upper segment), where the risk is significantly higher (4–9%) due to the thick, active muscular involvement of the fundus. * **Option D (50%):** This is clinically inaccurate and would make TOLAC an absolute contraindication in all scenarios. **High-Yield Clinical Pearls for NEET-PG:** * **Most common sign of scar rupture:** Fetal heart rate abnormalities (typically prolonged bradycardia). * **Most specific sign:** Recession of the presenting part (Station goes from +1 to -3). * **Classical Scar:** Risk of rupture is 4–9% and can occur *before* the onset of labor. * **LSCS Scar:** Risk is <1% and usually occurs *during* the active phase of labor. * **Contraindication for TOLAC:** Previous classical/T-shaped incision, previous uterine rupture, or any contraindication to vaginal delivery (e.g., placenta previa).

Question 763: Which of the following is a known side effect of magnesium sulfate used in the treatment of eclampsia?

A. Hypotension
B. Polyuria
C. Coma
D. Pulmonary edema (Correct Answer)

Explanation: **Explanation:** Magnesium sulfate ($MgSO_4$) is the drug of choice for both the prophylaxis and treatment of eclamptic seizures. However, it has a narrow therapeutic index, and toxicity must be closely monitored. **Why Pulmonary Edema is Correct:** Pulmonary edema is a serious and well-recognized side effect of $MgSO_4$ therapy. It occurs due to a combination of factors: $MgSO_4$ can cause mild vasodilation and increased capillary permeability; however, the primary risk arises when it is administered alongside aggressive intravenous fluid resuscitation (common in preeclampsia management) or in patients with underlying preeclamptic myocardial dysfunction or renal impairment. **Analysis of Incorrect Options:** * **A. Hypotension:** While $MgSO_4$ is a vasodilator, it is **not** an antihypertensive agent. It does not significantly lower blood pressure in eclamptic patients. * **B. Polyuria:** $MgSO_4$ is excreted solely by the kidneys. Toxicity actually causes **oliguria** (decreased urine output), which further worsens magnesium accumulation, creating a vicious cycle. * **C. Coma:** While severe toxicity leads to CNS depression and respiratory paralysis, "Coma" is not a standard clinical sign of $MgSO_4$ toxicity. The progression typically moves from loss of reflexes to respiratory arrest. **High-Yield Clinical Pearls for NEET-PG:** * **Monitoring Parameters:** Always check for the presence of **Patellar Reflex** (first sign to disappear at 7–10 mEq/L), **Respiratory Rate** (>12/min), and **Urine Output** (>30 ml/hr). * **Antidote:** 10 ml of 10% **Calcium Gluconate** (IV over 10 minutes). * **Therapeutic Range:** 4–7 mEq/L. * **Pritchard Regimen:** 4g IV + 10g IM (loading), followed by 5g IM every 4 hours (maintenance).

Question 764: What procedure should be performed in case of arrest of the aftercoming head due to a contracted pelvis in a breech presentation?

A. Craniotomy
B. Decapitation
C. Zavanelli maneuver (Correct Answer)
D. Cleidotomy

Explanation: **Explanation:** The **Zavanelli maneuver** is the correct intervention for an entrapped aftercoming head in a breech delivery when conventional maneuvers (like the Mauriceau-Smellie-Veit) fail due to a contracted pelvis or cephalopelvic disproportion. It involves manually flexing the fetal head, rotating it back to an occiput-anterior position, and cephalic replacement into the uterus, followed by an emergency Cesarean section. While more commonly associated with shoulder dystocia, it is the definitive "rescue" procedure for breech entrapment to prevent fetal hypoxia and birth trauma. **Analysis of Incorrect Options:** * **Craniotomy (A):** This is a destructive procedure used to reduce the size of the fetal head. It is only indicated in cases of a **dead fetus** or severe hydrocephalus where vaginal delivery is otherwise impossible. * **Decapitation (B):** This is a destructive procedure used for an **impacted transverse lie** with a dead fetus. It is not indicated for breech presentation. * **Cleidotomy (D):** This involves the intentional fracture of the fetal clavicle to reduce the bisacromial diameter. It is used in **shoulder dystocia**, not for the entrapment of the aftercoming head. **High-Yield Clinical Pearls for NEET-PG:** * **First-line for aftercoming head:** Mauriceau-Smellie-Veit maneuver. * **Forceps for breech:** Piper’s forceps are specifically designed for the aftercoming head. * **Prerequisite for Zavanelli:** Tocolysis (e.g., Nitroglycerin or Terbutaline) is often required to relax the uterus before attempting replacement. * **Burn-Marshall Maneuver:** Used when the fetus is hanging by its own weight to facilitate delivery of the head.

Question 765: In which of the following patients can a midline episiotomy be considered superior to a mediolateral episiotomy during delivery of the fetus?

A. Nulligravida with a thick perineum
B. Second stage arrest
C. Second gravida with moderate anemia (Correct Answer)
D. Before the application of forceps

Explanation: **Explanation:** The choice between a midline and mediolateral episiotomy depends on the clinical trade-off between ease of repair and the risk of extension. **Why Option C is Correct:** The primary advantage of a **midline episiotomy** over a mediolateral one is **minimal blood loss**. In a patient with **moderate anemia**, preserving every milliliter of blood is clinically significant to prevent postpartum decompensation. Midline incisions follow the relatively avascular fibrous raphe of the perineum, whereas mediolateral incisions cut through the bulbocavernosus and transverse perineal muscles, leading to significantly more bleeding. Additionally, midline episiotomies are easier to repair and associated with less postpartum pain. **Analysis of Incorrect Options:** * **Option A (Nulligravida):** Nulliparous women have a shorter, tighter perineum. Midline episiotomies in these patients carry a much higher risk of extension into the anal sphincter (3rd-degree) or rectum (4th-degree tear). * **Option B (Second stage arrest):** Arrest usually implies a large fetus or malposition. Midline episiotomies provide less room for maneuverability compared to mediolateral ones, which offer more space for delivery. * **Option D (Forceps application):** Instrumental deliveries significantly increase the risk of perineal trauma. A mediolateral episiotomy is strictly preferred during forceps or vacuum extraction to protect the anal sphincter from extension. **High-Yield Clinical Pearls for NEET-PG:** * **Mediolateral Episiotomy:** Most common type in India/UK. Angle: 45–60 degrees from the midline. * **Midline Episiotomy:** Most common in the USA. Higher risk of **OASIS** (Obstetric Anal Sphincter Injuries). * **Timing:** Should be performed when the perineum is bulging and 3–4 cm of the head is visible during a contraction (**crowning**). * **Structures cut in Mediolateral:** Skin, vaginal mucosa, bulbocavernosus, and superficial transverse perineal muscle.

Question 766: A G2P1 female at 35 weeks gestation presents with uterine contractions. Fetal distress is not observed, and her membranes are intact. What is the recommended course of action?

A. Administer 12 mg of betamethasone injection.
B. Obtain a vaginal swab for culture. (Correct Answer)
C. Initiate tocolytic therapy.
D. Perform cervical cerclage.

Explanation: This patient is presenting with **Preterm Labor (PTL)** at 35 weeks gestation. The management of PTL is highly dependent on the gestational age and the presence of risk factors. ### **Explanation of the Correct Answer** **B. Obtain a vaginal swab for culture:** According to current guidelines (ACOG/RCOG), the primary goal in late preterm labor (34+0 to 36+6 weeks) is the prevention of **Group B Streptococcus (GBS)** neonatal sepsis. Since the patient is in active labor, a vaginal-rectal swab for GBS culture should be obtained to determine the need for intrapartum antibiotic prophylaxis. If the GBS status is unknown at the time of delivery, antibiotics are initiated empirically. ### **Why Other Options are Incorrect** * **A. Administer 12 mg of betamethasone:** Antenatal corticosteroids are most beneficial between **24 and 34 weeks**. While some protocols consider them up to 36+6 weeks (Late Preterm), they are generally not the immediate "next step" priority compared to GBS screening once the 34-week threshold is crossed, especially if delivery is imminent. * **C. Initiate tocolytic therapy:** Tocolytics are indicated only to delay delivery for 48 hours to allow corticosteroids to work or for maternal transport. They are **not recommended after 34 weeks** as the risks of the medication outweigh the benefits of delaying delivery at this maturity. * **D. Perform cervical cerclage:** Cerclage is a prophylactic or emergency procedure for cervical insufficiency, typically performed before **24 weeks**. It is contraindicated in active labor or at 35 weeks gestation. ### **Clinical Pearls for NEET-PG** * **Cut-off for Tocolysis:** Do not give tocolytics after **34 weeks**. * **Steroid Window:** The "Golden Period" for steroids is **24–34 weeks**. Betamethasone (2 doses of 12mg, 24h apart) is preferred over Dexamethasone. * **GBS Prophylaxis:** Penicillin G is the drug of choice for GBS prophylaxis during labor. * **Management at 35 weeks:** Management is largely expectant; allow labor to progress while monitoring for GBS and fetal well-being.

Question 767: Fetal exsanguination can occur if:

A. Vasa previa (Correct Answer)
B. Placenta previa
C. Polyhydramnios
D. Oligohydramnios

Explanation: **Explanation:** **Vasa previa** is the correct answer because it involves fetal blood vessels (unprotected by Wharton’s jelly or placental tissue) crossing the internal os, often due to velamentous cord insertion or a succenturiate lobe. When the membranes rupture (spontaneously or artificially), these vessels can tear. Since these vessels contain **fetal blood**, even a small amount of bleeding can lead to rapid **fetal exsanguination** and death, as the total fetal blood volume is very low. **Why the other options are incorrect:** * **Placenta previa:** While this causes significant painless vaginal bleeding, the blood is primarily **maternal** in origin. While severe maternal hemorrhage can lead to fetal distress due to hypoxia, it does not cause direct fetal exsanguination. * **Polyhydramnios:** This refers to excessive amniotic fluid. While it increases the risk of cord prolapse or placental abruption upon rupture of membranes, it does not inherently cause fetal vessel rupture. * **Oligohydramnios:** This refers to low amniotic fluid. It is associated with cord compression and placental insufficiency, but not with acute fetal blood loss. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Rupture of membranes + Painless vaginal bleeding + Fetal bradycardia/distress. * **Apt Test / Ogita Test:** Used to differentiate fetal hemoglobin from maternal hemoglobin in vaginal blood. * **Management:** If diagnosed prenatally via Color Doppler, a planned Cesarean section is performed (usually at 34–36 weeks) to avoid labor and membrane rupture. * **Vasa Previa vs. Placenta Previa:** In Vasa Previa, the bleeding is fetal (high mortality); in Placenta Previa, the bleeding is maternal.

Question 768: All are causes of Antepartum hemorrhage (APH) except?

A. Placenta previa
B. Abruptio placenta
C. Circumvallate placenta
D. Battledore placenta (Correct Answer)

Explanation: **Explanation:** Antepartum hemorrhage (APH) is defined as bleeding from or into the genital tract occurring from the 28th week of pregnancy until the birth of the baby. The causes are broadly categorized into Placental (70%), Extraplacental (e.g., cervical polyps, trauma), and Unexplained. **Why Battledore Placenta is the correct answer:** Battledore placenta (marginal insertion of the cord) is a condition where the umbilical cord is attached to the margin of the placenta rather than the center. While it is associated with an increased risk of preterm labor and cord prolapse, it **does not** inherently cause maternal bleeding or APH. It is a structural variation of cord insertion, not a hemorrhagic pathology. **Analysis of Incorrect Options:** * **Placenta Previa:** This is a leading placental cause of APH where the placenta is implanted in the lower uterine segment. Bleeding occurs as the lower segment stretches and the placenta separates. * **Abruptio Placenta:** This refers to the premature separation of a normally situated placenta. It is a classic cause of painful APH. * **Circumvallate Placenta:** This is a morphological abnormality where the chorionic plate is smaller than the basal plate, causing the membranes to double back. It is a recognized cause of mild to moderate APH and intermittent "hydrorrhea gravidarum." **NEET-PG High-Yield Pearls:** * **Vasa Previa:** Unlike Battledore placenta, **Vasa Previa** (associated with velamentous insertion) causes significant fetal bleeding (APH) when membranes rupture. * **Most common cause of APH:** Abruptio Placenta. * **Painless, Causeless, Recurrent bleeding:** Classic presentation of Placenta Previa. * **Painful, Dark bleeding with Uterine Tenderness:** Classic presentation of Abruptio Placenta.

Question 769: Most deaths involving placenta previa result from:

A. Infection
B. Toxemia
C. Hemorrhage (Correct Answer)
D. Thrombophlebitis

Explanation: **Explanation:** **Placenta Previa** is defined as the implantation of the placenta in the lower uterine segment, overlying or near the internal os. **Why Hemorrhage is the Correct Answer:** The primary cause of mortality in placenta previa is **exsanguinating hemorrhage**. As the lower uterine segment stretches and thins during the third trimester or early labor, the inelastic placental attachments are sheared off, leading to the opening of maternal sinuses. Because the lower uterine segment lacks the thick, interlacing muscle fibers (the "living ligatures") found in the upper segment, it cannot contract effectively to compress the bleeding vessels. This leads to sudden, painless, and profuse bleeding that can result in hypovolemic shock and death if not managed emergently. **Why Other Options are Incorrect:** * **Infection (A):** While the proximity of the placental site to the vagina increases the risk of puerperal sepsis, modern antibiotics have made this a rare cause of death. * **Toxemia (B):** This refers to Pre-eclampsia/Eclampsia. There is no direct pathophysiological link between placenta previa and toxemia; they are distinct obstetric complications. * **Thrombophlebitis (D):** While pregnancy is a hypercoagulable state, thromboembolic events are secondary complications and not the leading cause of death specific to the pathology of placenta previa. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Painless, causeless, and recurrent bright red vaginal bleeding in the third trimester. * **Cardinal Rule:** **Never** perform a per-vaginal (PV) examination in a suspected case of placenta previa outside of a "Double Setup" (in the OT), as it can provoke fatal hemorrhage. * **Investigation of Choice:** Transvaginal Ultrasound (TVS) is the gold standard for localization (safe when done carefully). * **Stallworthy’s Sign:** A dip in the fetal heart rate when the head is pressed into the pelvis, suggesting a posterior placenta previa.

Question 770: A pregnant patient at 34 weeks gestation presents with leakage. Which investigation can be done to diagnose the leak?

A. Speculum examination (Correct Answer)
B. Ultrasound (USG)
C. Non-stress test (NST)
D. Three swab test

Explanation: The diagnosis of **Preterm Prelabor Rupture of Membranes (PPROM)** is primarily clinical. **Why Speculum Examination is the Correct Answer:** A sterile speculum examination is the **gold standard** initial investigation for diagnosing a liquor leak. It allows for direct visualization of fluid pooling in the posterior vaginal fornix. Furthermore, it enables the clinician to perform the **Nitrazine test** (pH paper turns blue) and collect fluid for the **Fern test** (arborization pattern on microscopy). Importantly, digital vaginal examinations should be avoided as they increase the risk of chorioamnionitis. **Why Other Options are Incorrect:** * **Ultrasound (USG):** While USG can detect *Oligohydramnios* (low amniotic fluid), it cannot differentiate between a leak, renal anomalies, or placental insufficiency. It is supportive but not diagnostic of a leak. * **Non-stress test (NST):** This is used to monitor fetal well-being and reactivity. It does not diagnose the rupture of membranes. * **Three Swab Test:** This is the diagnostic test for **Vesicovaginal Fistula (VVF)**, used to differentiate between urinary incontinence and a fistula, not for amniotic fluid leaks. **High-Yield Clinical Pearls for NEET-PG:** * **Amnisure:** A rapid bedside immunoassay that detects **Placental Alpha Microglobulin-1 (PAMG-1)**; it has a very high sensitivity and specificity for PROM. * **Management at 34 weeks:** According to ACOG/RCOG, if PPROM occurs at $\geq$ 34 weeks, delivery is generally recommended as the risk of infection outweighs the risks of prematurity. * **Prophylaxis:** Corticosteroids (for lung maturity) and antibiotics (to delay latency) are indicated if PPROM occurs before 34 weeks.

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

Practice Questions

Fetal Monitoring Techniques

Practice Questions

Pain Management in Labor

Practice Questions

Induction and Augmentation of Labor

Practice Questions

Operative Delivery (Forceps and Vacuum)

Practice Questions

Cesarean Section: Indications and Techniques

Practice Questions

Dystocia and Abnormal Labor Patterns

Practice Questions

Obstetric Emergencies

Practice Questions

Postpartum Hemorrhage Management

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free