Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 301: Which of the following measures can help prevent perineal injury during normal labor?

A. Maintaining flexion of the fetal head
B. Performing episiotomy routinely (Correct Answer)
C. Ensuring slow delivery of the fetal head between contractions
D. Providing effective perineal support/guarding

Explanation: **Explanation:** The goal of perineal management during labor is to minimize the risk of high-degree perineal tears (3rd and 4th degree). **Why Option B is the Correct Answer (in the context of traditional teaching/NEET-PG):** While modern evidence-based guidelines (like WHO and ACOG) advocate for **restrictive** episiotomy, traditional obstetric teaching often emphasizes that a controlled, surgical incision (episiotomy) prevents irregular, jagged, and deep spontaneous perineal tears. By substituting a potential 3rd-degree tear with a controlled 2nd-degree incision, it is traditionally argued that the integrity of the anal sphincter is better preserved. **Analysis of Incorrect Options:** * **Option A & C:** Maintaining flexion and ensuring slow delivery between contractions are standard maneuvers (e.g., Ritgen’s maneuver) used to reduce the diameter of the presenting part and allow the perineum to stretch gradually. While these are protective, in the context of "preventing" major injury in high-risk scenarios (like a rigid perineum), the surgical intervention of an episiotomy is considered the definitive preventive measure in many classic textbooks. * **Option D:** Perineal support/guarding is a manual technique to support the tissues. While it reduces the rate of tears, it is often viewed as a supportive measure rather than a definitive preventive procedure compared to a mediolateral episiotomy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type:** Mediolateral episiotomy is preferred over midline to reduce the risk of extension into the anal sphincter. * **Timing:** It should be performed when the perineum is bulging and 3–4 cm of the head is visible during a contraction (crowning). * **Modern Shift:** Current RCOG/ACOG guidelines recommend **restrictive** use; routine episiotomy is no longer recommended as it may actually increase the risk of deep tears. However, for exams, follow the textbook emphasis on its protective role against spontaneous lacerations.

Question 302: Which of the following is seen in the 2nd stage of labor?

A. Expulsion of the fetus
B. Increase in contraction
C. Cervical dilatation
D. All of the above (Correct Answer)

Explanation: The **Second Stage of Labor** begins with the full dilatation of the cervix (10 cm) and ends with the expulsion of the fetus. **Explanation of the Correct Answer:** * **Expulsion of the fetus (Option A):** This is the defining clinical outcome of the second stage. It involves the descent and delivery of the baby through the birth canal via the "Mechanism of Labor." * **Increase in contraction (Option B):** During this stage, uterine contractions become stronger, longer (lasting 60–90 seconds), and more frequent (2–3 minutes apart). Additionally, the secondary powers (maternal bearing-down efforts or "Valsalva maneuver") are recruited, significantly increasing intra-abdominal pressure. * **Cervical dilatation (Option C):** While the *process* of dilatation occurs primarily in the first stage, the second stage begins only once **full cervical dilatation** is achieved. In clinical practice, the transition to the second stage is confirmed when the cervix is no longer palpable. Since all these physiological and clinical events characterize the second stage, **Option D** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** * **Duration:** In primigravida, it lasts ~2 hours (3 with epidural); in multigravida, ~1 hour (2 with epidural). * **Signs of 2nd Stage:** Pushing reflex (Ferguson’s reflex), bulging of the perineum, and "crowning" of the head. * **Management:** The "Active Management of Second Stage" involves monitoring fetal heart rate every 5 minutes or after every contraction. * **Episiotomy:** If required, it is performed during this stage when the perineum is thinned out and the head is crowning.

Question 303: On external cephalic version, fetal bradycardia occurred. What is the recommended next course of action?

A. Revert to the original position immediately by external version (Correct Answer)
B. Perform internal podalic version
C. Proceed with cesarean section
D. Rupture of membranes

Explanation: **Explanation:** External Cephalic Version (ECV) is a procedure used to convert a malpresentation (breech or transverse) to a cephalic presentation. While generally safe, it can cause transient fetal heart rate (FHR) abnormalities, most commonly due to umbilical cord compression or placental abruption. **1. Why Option A is Correct:** The immediate management of fetal bradycardia during ECV is to **stop the procedure and revert the fetus to its original position**. This maneuver relieves potential cord entanglement or compression caused by the version. In most cases, the FHR returns to normal once the pressure is released and the fetus is returned to its baseline lie. If the FHR does not recover within a few minutes after reversion, an emergency Cesarean section is then indicated. **2. Why Other Options are Incorrect:** * **Option B (Internal Podalic Version):** This is contraindicated in a singleton pregnancy with a live fetus. It is primarily reserved for the delivery of a second twin. * **Option C (Proceed with Cesarean Section):** While a C-section is the definitive management for persistent fetal distress, it is not the *immediate* first step. Reverting the fetus is a faster bedside maneuver that often resolves the bradycardia, potentially avoiding unnecessary surgery. * **Option D (Rupture of Membranes):** Artificial rupture of membranes (ARM) is contraindicated during an unsuccessful version as it "commits" the presentation, increases the risk of cord prolapse, and makes further version attempts impossible. **Clinical Pearls for NEET-PG:** * **Prerequisites for ECV:** Performed at **>37 weeks** (to minimize preterm risks), reactive NST, adequate liquor, and no uterine scars. * **Tocolysis:** Use of beta-mimetics (e.g., Terbutaline) increases the success rate of ECV. * **Most common complication:** Transient fetal bradycardia (occurs in ~10-20% of cases). * **Absolute Contraindications:** Placenta previa, multifetal gestation, ruptured membranes, and prior classical C-section.

Question 304: Maximum chances of amniotic fluid embolism is seen at?

A. First trimester
B. Second trimester
C. Labor (Correct Answer)
D. Postpartum

Explanation: ### Explanation **Amniotic Fluid Embolism (AFE)**, also known as Anaphylactoid Syndrome of Pregnancy, is a rare but catastrophic obstetric emergency. It occurs when amniotic fluid, fetal cells, or debris enter the maternal circulation, triggering a systemic inflammatory response and massive activation of the coagulation cascade. **Why Labor is the Correct Answer:** The maximum risk of AFE occurs during **labor and delivery** (approximately 70% of cases). This is because the physiological process of labor involves strong uterine contractions and the rupture of membranes. These events create a pressure gradient that forces amniotic fluid into the maternal venous system through the endocervical veins, the placental site (during separation), or uterine trauma sites. **Analysis of Incorrect Options:** * **First and Second Trimester:** While AFE can occur during late second-trimester abortions or amniocentesis, it is extremely rare. The volume of amniotic fluid and the degree of vascular exposure are significantly lower than at term. * **Postpartum:** AFE can occur immediately postpartum (usually within 30 minutes of delivery), but the statistical incidence is lower than the intrapartum period. Once the fetus and placenta are delivered, the primary "pump" (uterine contractions) and the source of fluid are removed. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Sudden hypoxia (dyspnea/cyanosis), hypotension, and coagulopathy (DIC). * **Pathophysiology:** It is now considered an **immune-mediated/anaphylactoid reaction** rather than a simple mechanical obstruction. * **Risk Factors:** Advanced maternal age, multiparity, placental abruption, and medically induced labor (hyperstimulation). * **Diagnosis:** Primarily a **clinical diagnosis of exclusion**. Post-mortem findings may show fetal squames in the maternal pulmonary vasculature. * **Management:** Supportive care (A-B-C) and the **"A-OK" protocol** (Atropine, Ondansetron, and Ketorolac) is a modern pharmacological approach being studied.

Question 305: Which of the following is not a contraindication for trial of labour?

A. Malpresentation
B. Rachitic pelvis
C. Previous LSCS
D. Multigravida (Correct Answer)

Explanation: **Explanation:** A **Trial of Labour (TOL)** is the clinical assessment of the progress of labor in a patient with a borderline contracted pelvis to determine if vaginal delivery is possible. **Why Multigravida is the Correct Answer:** Being a **multigravida** is not a contraindication; in fact, a previous successful vaginal delivery is one of the most favorable prognostic factors for a successful trial of labor. A trial of labor is typically indicated in cases of minor degrees of cephalopelvic disproportion (CPD), such as a Grade I or II contracted pelvis, where the patient is otherwise healthy and the fetus is in a longitudinal lie. **Why the other options are Contraindications:** * **Malpresentation (A):** For a trial of labor to be safe, the fetus must be in a **vertex presentation**. Malpresentations like transverse lie, brow, or mentoposterior positions are absolute contraindications as they cannot navigate a borderline pelvis safely. * **Rachitic Pelvis (B):** This refers to a pelvis deformed by rickets (usually a flat pelvis). If the deformity results in an outlet contraction or a high-grade pelvic contraction (Grade III or IV), a trial of labor is contraindicated due to the high risk of obstructed labor and uterine rupture. * **Previous LSCS (C):** While a "Trial of Labour After Cesarean" (TOLAC) exists, in the specific context of assessing a **contracted pelvis**, a previous uterine scar is generally considered a contraindication for a traditional TOL. The increased intrauterine pressure required to overcome a bony disproportion poses a significant risk of **scar dehiscence or rupture**. **High-Yield NEET-PG Pearls:** * **Prerequisites for TOL:** Vertex presentation, spontaneous onset of labor, and a Grade I or II contracted pelvis. * **Success Criteria:** TOL is successful if a healthy baby is born vaginally within a reasonable timeframe without maternal or fetal injury. * **Contraindications:** Presence of any obstetric complication (e.g., placenta previa, pre-eclampsia), previous classical CS, or elderly primigravida.

Question 306: What is the commonest type of fetal presentation during labor?

A. Breech
B. Shoulder
C. Brow
D. Vertex (Correct Answer)

Explanation: **Explanation:** The correct answer is **Vertex**. In obstetrics, **presentation** refers to the part of the fetus that lies over the pelvic inlet. **Why Vertex is Correct:** Cephalic (head-first) presentation occurs in approximately **96-97%** of all term pregnancies. Within cephalic presentations, the **Vertex** is the most common. It occurs when the fetal head is well-flexed, bringing the suboccipitobregmatic diameter (9.5 cm) to the pelvic inlet. This is the most favorable position for a vaginal delivery because it presents the smallest diameter of the fetal head to the maternal pelvis. **Analysis of Incorrect Options:** * **A. Breech:** This is a longitudinal lie where the buttocks or feet present first. It occurs in only about **3-4%** of term pregnancies, though it is more common in preterm labor. * **B. Shoulder:** This occurs in a **transverse lie**. It is rare (less than 0.5% at term) and is an absolute indication for a Cesarean section if the fetus is viable and the lie does not stabilize. * **C. Brow:** This occurs when the fetal head is partially extended. It is an unstable presentation and usually converts to either a vertex or a face presentation. It is rare, occurring in about 1 in 1400 deliveries. **Clinical Pearls for NEET-PG:** * **Denominator:** The landmark used to describe the position. For Vertex, it is the **Occiput**; for Breech, it is the **Sacrum**; for Face, it is the **Mentum**. * **Most common position:** Left Occipito-Anterior (LOA) is traditionally considered the most common, though many modern studies suggest Occipito-Transverse (OT) is the most frequent initial position at the onset of labor. * **Malpresentation vs. Malposition:** Breech/Shoulder are *malpresentations*, while Persistent Occipito-Posterior (OP) is a *malposition*.

Question 307: Abortion in the second trimester is mostly due to:

A. Incompetent cervix (Correct Answer)
B. Defective genes
C. Tuberculosis
D. Trauma

Explanation: **Explanation:** The majority of spontaneous abortions (miscarriages) occur in the first trimester, primarily due to chromosomal abnormalities. However, once a pregnancy reaches the **second trimester (13–28 weeks)**, the etiology shifts from genetic factors to anatomical and maternal factors. **1. Why "Incompetent Cervix" is correct:** Cervical insufficiency (incompetent cervix) is the most common cause of mid-trimester pregnancy loss. It is characterized by the painless dilation of the cervix, leading to the prolapse of membranes and subsequent expulsion of a premature but often morphologically normal fetus. This occurs because the cervix fails to remain closed against the increasing intrauterine pressure as the fetus grows. **2. Analysis of Incorrect Options:** * **Defective Genes (Chromosomal Abnormalities):** This is the leading cause of **first-trimester** abortions (approx. 50–60%). While they can cause second-trimester loss, their frequency decreases significantly as the pregnancy advances. * **Tuberculosis:** While genital TB is a major cause of primary and secondary infertility (due to tubal blockage or endometrial scarring), it is a rare cause of spontaneous abortion compared to anatomical defects. * **Trauma:** Though a common concern for patients, physical trauma is rarely the cause of abortion unless it is severe enough to cause placental abruption or direct uterine injury. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) showing a cervical length **<25 mm** or "funneling" of the internal os before 24 weeks. * **Treatment:** Cervical Cerclage (e.g., **McDonald’s or Shirodkar’s procedure**), typically performed between 14–18 weeks of gestation. * **Classic History:** Repeated, painless, mid-trimester abortions preceded by spontaneous rupture of membranes.

Question 308: The classic triad of ruptured ectopic pregnancy includes all except?

A. Fainting (Correct Answer)
B. Abdominal pain
C. History of amenorrhea
D. Vaginal bleeding

Explanation: **Explanation:** In Obstetrics and Gynecology, the **classic clinical triad** of a ruptured ectopic pregnancy consists of: 1. **Abdominal pain** (most common symptom, present in 95–100% of cases). 2. **Amenorrhea** (history of a missed period, present in 75–95% of cases). 3. **Vaginal bleeding** (usually spotting or slight bleeding, present in 60–80% of cases). **Why "Fainting" is the correct answer:** While fainting (syncope) is a significant clinical sign of a ruptured ectopic pregnancy due to internal hemorrhage and hypovolemic shock, it is **not** part of the formal "classic triad." Fainting is considered a symptom of hemodynamic instability rather than a diagnostic component of the primary triad. **Analysis of Incorrect Options:** * **Abdominal Pain:** This is the hallmark symptom. It is usually sudden, severe, and localized to the iliac fossa initially, later becoming generalized due to hemoperitoneum. * **History of Amenorrhea:** Most patients have a period of 6–8 weeks of amenorrhea before rupture occurs. * **Vaginal Bleeding:** This occurs due to the breakdown of the decidua as the pregnancy fails. It is typically dark brown and scanty. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Transvaginal Ultrasound (TVS) + Serum β-hCG. * **Arias-Stella Reaction:** A characteristic histological change in the endometrium (hypersecretory glands) seen in ectopic pregnancy, though not pathognomonic. * **Most Common Site:** The **Ampulla** of the Fallopian tube. * **Most Common Site for Rupture:** The **Isthmus** (ruptures early, at 6–8 weeks) or **Interstitial** portion (ruptures late, at 12–14 weeks, often causing massive hemorrhage).

Question 309: Most common nerve injured during normal vaginal delivery is?

A. Femoral nerve
B. Lateral femoral cutaneous nerve (Correct Answer)
C. Iliohypogastric nerve
D. Ilioinguinal nerve

Explanation: **Explanation:** The **Lateral Femoral Cutaneous Nerve (LFCN)** is the most common nerve injured during normal vaginal delivery. This injury typically occurs due to prolonged positioning in the **lithotomy position**. The nerve (derived from L2-L3) passes under the inguinal ligament; extreme flexion, abduction, and external rotation of the thighs can cause the inguinal ligament to compress the nerve against the pelvic brim. This leads to **Meralgia Paresthetica**, characterized by numbness, tingling, or burning pain along the anterolateral aspect of the thigh, without motor deficit. **Analysis of Incorrect Options:** * **Femoral Nerve:** While it can be injured during vaginal delivery due to hyperflexion of the hips (compression under the inguinal ligament), it is less common than LFCN injury. It presents with loss of knee extension and a diminished patellar reflex. * **Iliohypogastric & Ilioinguinal Nerves:** These are more commonly injured during **Lower Segment Cesarean Section (LSCS)** or other pelvic surgeries involving transverse incisions (like the Pfannenstiel incision), rather than during a normal vaginal delivery. **Clinical Pearls for NEET-PG:** * **Most common nerve injured in LSCS:** Iliohypogastric or Ilioinguinal nerve. * **Most common nerve injured by Forceps application:** Obturator nerve (leads to difficulty in adduction of the thigh). * **Peroneal Nerve injury:** Occurs due to direct pressure on the neck of the fibula by lithotomy stirrups, leading to **foot drop**. * **Key Distinguisher:** LFCN injury is purely **sensory**; if motor weakness is present, consider Femoral or Obturator nerve involvement.

Question 310: Which is the most important diameter of the pelvis during labor?

A. Interspinous diameter of the outlet (Correct Answer)
B. Oblique diameter of the inlet
C. Anteroposterior diameter of the outlet
D. Intertubercular diameter

Explanation: The **interspinous diameter** is considered the most important diameter of the pelvis during labor because it represents the **narrowest part of the entire birth canal**. ### Explanation of the Correct Answer The interspinous diameter is the distance between the two ischial spines (normally measuring **10.5 cm**). It marks the plane of the **mid-pelvis**, which is the site of the least pelvic dimensions. If the fetal head can successfully pass through this diameter, it is highly likely that the rest of the delivery will proceed without bony obstruction. It is also the landmark used to determine the **station** of the fetal head (Station 0). ### Why Other Options are Incorrect * **Oblique diameter of the inlet (12 cm):** While important for the initial engagement of the fetal head, the inlet is generally wider than the mid-pelvis. Most cases of cephalopelvic disproportion (CPD) occur at the mid-pelvis or outlet rather than a roomy inlet. * **Anteroposterior diameter of the outlet (11.5 cm):** This diameter extends from the lower border of the symphysis pubis to the tip of the coccyx. Because the coccyx is mobile and can deflect posteriorly during labor, this diameter rarely poses a significant obstruction. * **Intertubercular diameter (11 cm):** This is the transverse diameter of the pelvic outlet. While it is a limiting factor, the interspinous diameter is narrower and reached earlier in the descent, making it the more critical clinical bottleneck. ### High-Yield Clinical Pearls for NEET-PG * **Narrowest Diameter:** Interspinous diameter (10.5 cm). * **Shortest AP Diameter of Inlet:** Obstetric conjugate (10 cm) – calculated by subtracting 1.5–2 cm from the Diagonal Conjugate. * **Diagonal Conjugate:** The only AP diameter that can be measured clinically via per-vaginal examination. * **Mid-pelvis Contraction:** Suspected if the ischial spines are prominent or the interspinous diameter is <10 cm.

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

Practice Questions

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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