Labor and Delivery Practice Questions

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

Postpartum hemorrhage. **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.

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

1%. **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).

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

Pulmonary edema. **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).

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

Zavanelli maneuver. **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.

Q: Fetal exsanguination can occur if:

Vasa previa. **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.

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

Battledore placenta. **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.

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

Speculum examination. 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.

Question 1

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

Accepted Answer

Postpartum hemorrhage

Answer

Meconium aspiration syndrome

Answer

Intracranial hemorrhage

Answer

Placental insufficiency leading to fetal hypoxia

Question 2

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

Accepted Answer

1%

Answer

5%

Answer

10%

Answer

50%

Question 3

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

Accepted Answer

Pulmonary edema

Answer

Hypotension

Answer

Polyuria

Answer

Coma

Question 4

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

Accepted Answer

Zavanelli maneuver

Answer

Craniotomy

Answer

Decapitation

Answer

Cleidotomy

Question 5

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

Accepted Answer

Second gravida with moderate anemia

Answer

Nulligravida with a thick perineum

Answer

Second stage arrest

Answer

Before the application of forceps

Question 6

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?

Accepted Answer

Obtain a vaginal swab for culture.

Answer

Administer 12 mg of betamethasone injection.

Answer

Initiate tocolytic therapy.

Answer

Perform cervical cerclage.

Question 7

Fetal exsanguination can occur if:

Accepted Answer

Vasa previa

Answer

Placenta previa

Answer

Polyhydramnios

Answer

Oligohydramnios

Question 8

All are causes of Antepartum hemorrhage (APH) except?

Accepted Answer

Battledore placenta

Answer

Placenta previa

Answer

Abruptio placenta

Answer

Circumvallate placenta

Question 9

Most deaths involving placenta previa result from:

Accepted Answer

Hemorrhage

Answer

Infection

Answer

Toxemia

Answer

Thrombophlebitis

Question 10

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

Accepted Answer

Speculum examination

Answer

Ultrasound (USG)

Answer

Non-stress test (NST)

Answer

Three swab test

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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