Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 731: Which of the following statements regarding placenta previa is false?

A. Presents commonly in the 3rd trimester
B. Associated with painful vaginal bleeding (Correct Answer)
C. Ultrasound is the investigation of choice
D. Increased maternal age is a risk factor

Explanation: **Explanation:** The hallmark of **Placenta Previa** is **painless, causeless, and recurrent** vaginal bleeding. This occurs because, as the lower uterine segment stretches and the cervix begins to efface in the third trimester, the placental attachments are disrupted, leading to bleeding from the maternal venous sinuses. In contrast, **painful** vaginal bleeding is the classic presentation of **Abruptio Placentae**, where the pain results from extravasation of blood into the myometrium (Couvelaire uterus) and uterine contractions. **Analysis of Options:** * **Option A (True):** Bleeding typically occurs in the late 2nd or early 3rd trimester (the "warning hemorrhage") as the lower uterine segment forms. * **Option C (True):** **Transvaginal Ultrasound (TVS)** is the gold standard and investigation of choice. It is safe and more accurate than transabdominal scans for measuring the distance between the internal os and the placental edge. * **Option D (True):** Risk factors include advanced maternal age, multiparity, prior Cesarean sections, smoking, and prior curettage. **Clinical Pearls for NEET-PG:** * **Stallworthy’s Sign:** A drop in fetal heart rate when the fetal head is pressed into the pelvic inlet, suggestive of posterior placenta previa. * **Management:** If the patient is stable and <37 weeks, **MacAfee & Johnson (Expectant) management** is followed. * **Contraindication:** **Digital vaginal examination** is strictly contraindicated unless the patient is in the operation theater prepared for an immediate Cesarean section (Double Setup Examination), as it can provoke torrential hemorrhage.

Question 732: Engagement of the fetal head is with reference to which of the following diameters?

A. Biparietal diameter (Correct Answer)
B. Bitemporal diameter
C. Occipitofrontal diameter
D. Suboccipitofrontal diameter

Explanation: **Explanation:** **Engagement** is defined as the passage of the widest transverse diameter of the fetal presenting part through the plane of the pelvic inlet. In a cephalic presentation, this widest transverse diameter is the **Biparietal Diameter (BPD)**, which measures approximately **9.5 cm**. 1. **Why Biparietal Diameter is correct:** For engagement to occur, the BPD must pass the pelvic brim. Clinically, this corresponds to the lowest part of the fetal skull reaching the level of the ischial spines (Station 0) and is confirmed abdominally when only 2/5ths or less of the fetal head is palpable. 2. **Why other options are incorrect:** * **Bitemporal diameter (8.2 cm):** This is a smaller transverse diameter. While it passes the inlet first, it does not signify engagement because the wider BPD is still above the brim. * **Occipitofrontal diameter (11.5 cm):** This is an anteroposterior (AP) diameter of the head, seen in a deflexed vertex presentation. Engagement refers to the transverse diameter passing the inlet. * **Suboccipitofrontal diameter (10 cm):** This is the AP diameter in a partially flexed head. Like the occipitofrontal, it is not the reference diameter for the definition of engagement. **High-Yield Clinical Pearls for NEET-PG:** * **Deep Engagement:** In primigravidae, engagement usually occurs between 36–38 weeks of gestation. In multigravidae, it often occurs at the onset of labor. * **Rule of Fifths:** A head is considered engaged when only **2/5ths** or less is palpable abdominally. * **Most common engaging diameter (AP):** In a well-flexed head, the AP diameter that engages is the **Suboccipitobregmatic (9.5 cm)**. * **Floating Head:** If the head is not engaged at the onset of labor in a primigravida, it is a warning sign of potential Cephalopelvic Disproportion (CPD).

Question 733: Which diameter is the engaging diameter in vertex presentation with complete extension?

A. Suboccipitobregmatic
B. Mentovertical
C. Submentobregmatic (Correct Answer)
D. Occipitofrontal

Explanation: In vertex presentation, the attitude of the fetal head determines which diameter engages in the maternal pelvis. **Explanation of the Correct Answer:** When the fetal head is in **complete extension**, the presentation is technically a **Face Presentation**. In this position, the denominator is the mentum (chin). The engaging diameter is the **Submentobregmatic** diameter, which measures approximately **9.5 cm**. This diameter extends from the junction of the floor of the mouth and neck to the center of the bregma. Because it is the same size as the suboccipitobregmatic diameter (seen in full flexion), a vaginal delivery is possible if the mentum is anterior. **Analysis of Incorrect Options:** * **Suboccipitobregmatic (9.5 cm):** This is the engaging diameter in a **well-flexed** head (Vertex presentation). * **Mentovertical (13.5 cm):** This is the largest diameter of the fetal head, extending from the chin to the highest point on the vertex. It is the engaging diameter in **Brow presentation** (partial extension), which usually necessitates a Cesarean section. * **Occipitofrontal (11.5 cm):** This is the engaging diameter when the head is **deflexed** or in a "military" position (Vertex presentation). **High-Yield Clinical Pearls for NEET-PG:** 1. **Flexion vs. Extension:** Flexion decreases the engaging diameter, while extension (except in full face presentation) increases it. 2. **Mento-Posterior:** In face presentation, if the chin is posterior (Mento-posterior), spontaneous rotation is unlikely, and vaginal delivery is impossible because the head cannot extend further to negotiate the pelvic curve. 3. **Rule of 9.5s:** Both the most flexed (Suboccipitobregmatic) and most extended (Submentobregmatic) diameters measure 9.5 cm.

Question 734: What is true about the active management of the third stage of labor?

A. Oxytocin can be given after delivery of the baby. (Correct Answer)
B. Methergine is preferred over oxytocin.
C. Uterine massage is used to maintain uterine contractions after delivery of the placenta.
D. None of the above.

Explanation: **Explanation:** Active Management of the Third Stage of Labor (AMTSL) is a critical intervention designed to prevent Postpartum Hemorrhage (PPH). It consists of three main components: administration of a uterotonic agent, controlled cord traction (CCT), and uterine massage after placental delivery. 1. **Why Option A is correct:** Oxytocin is the gold-standard uterotonic for AMTSL. It should be administered (10 IU IM or 5 IU slow IV) immediately following the delivery of the baby (after ruling out a second twin). Early administration ensures the uterus remains contracted as the placenta separates, reducing blood loss. 2. **Why Option B is incorrect:** While Methergine (Methylergonovine) is a potent uterotonic, it is **not** preferred over oxytocin because it carries a risk of hypertension and cannot be used in patients with pre-eclampsia or heart disease. Oxytocin has a faster onset, fewer side effects, and no contraindications. 3. **Why Option C is incorrect:** While uterine massage is a component of AMTSL, its primary purpose is to **ensure the uterus remains well-contracted** and to identify early signs of uterine atony. It is not used to "maintain contractions" in a physiological sense but rather to monitor and stimulate tone. (Note: In some recent WHO guidelines, CCT is optional, but oxytocin remains the most vital step). **High-Yield NEET-PG Pearls:** * **Drug of Choice for AMTSL:** Oxytocin (10 IU IM). * **Drug of Choice for PPH Prophylaxis in Resource-Poor Settings:** Misoprostol (600 mcg orally). * **Timing:** The third stage is considered prolonged if it exceeds 30 minutes. * **Delayed Cord Clamping:** Current guidelines recommend waiting 1–3 minutes before clamping the cord to improve neonatal iron stores, which is now integrated into AMTSL protocols.

Question 735: The longest anteroposterior diameter of the pelvic inlet is seen in which type of pelvis?

A. Anthropoid (Correct Answer)
B. Platypelloid
C. Android
D. Gynaecoid

Explanation: The pelvic inlet is defined by its shape and the relationship between its anteroposterior (AP) and transverse diameters. This classification is based on the **Caldwell-Moloy system**. ### **Why Anthropoid is Correct** The **Anthropoid pelvis** is characterized by an oval shape where the **anteroposterior (AP) diameter is significantly longer than the transverse diameter**. It resembles the pelvis of great apes. Because the AP diameter is the longest dimension of the inlet, the fetal head often engages in the **occipito-posterior (OP)** position or a direct AP diameter. ### **Analysis of Incorrect Options** * **Platypelloid (Flat):** This is the opposite of anthropoid. It has a very wide transverse diameter but a **shortened AP diameter**. It is the rarest type and often leads to transverse engagement. * **Android (Male-type):** This is heart-shaped with a narrow fore-pelvis. While the AP diameter is adequate, the widest transverse diameter is located posteriorly, near the sacrum, making it unfavorable for labor. * **Gynaecoid (Female-type):** This is the most common and ideal type for delivery. It is nearly round, meaning the AP and transverse diameters are **roughly equal**, rather than one being significantly longer. ### **High-Yield Clinical Pearls for NEET-PG** * **Most Common Type:** Gynaecoid (approx. 50% of women). * **Most Common Malpresentation in Android/Anthropoid:** Persistent Occipito-Posterior (POP) position. * **Deep Transverse Arrest:** Most commonly associated with the **Android** pelvis. * **Inlet Shape Summary:** * **Gynaecoid:** Round * **Android:** Heart-shaped * **Anthropoid:** Long Oval (AP > Transverse) * **Platypelloid:** Flat Oval (Transverse > AP)

Question 736: Pathological contraction ring is due to:

A. Obstructed labour (Correct Answer)
B. Uterine inertia
C. Preterm labour
D. Oligohydramnios

Explanation: ### Explanation **Correct Answer: A. Obstructed labour** A **Pathological Contraction Ring**, also known as **Bandl’s Ring**, is a classic clinical sign of late-stage obstructed labor. In normal labor, the uterus is divided into an active upper segment (which thickens and contracts) and a passive lower segment (which thins and stretches). In cases of **obstructed labor** (e.g., cephalopelvic disproportion or malpresentation), the upper segment continues to contract forcefully to overcome the obstruction, while the lower segment becomes excessively thinned and distended. The junction between these two segments becomes visible and palpable as a transverse ridge—the Bandl’s Ring. This is a **pre-rupture sign**; if the obstruction is not relieved, the thinned lower segment will eventually rupture. **Why other options are incorrect:** * **B. Uterine inertia:** This refers to weak or infrequent contractions. In this state, the uterus lacks the force required to create a distinct physiological or pathological ring. * **C. Preterm labour:** This is defined by the timing of labor (before 37 weeks). While preterm labor can be difficult, it does not inherently cause a pathological ring unless it is also obstructed. * **D. Oligohydramnios:** Low amniotic fluid levels are associated with placental insufficiency or fetal anomalies but do not cause the mechanical segment differentiation seen in Bandl’s Ring. **High-Yield Clinical Pearls for NEET-PG:** * **Physiological vs. Pathological:** A *Physiological Retraction Ring* exists in every normal labor but is not visible or palpable. It becomes *Pathological (Bandl’s Ring)* only when labor is obstructed. * **Clinical Sign:** Bandl’s Ring is often seen rising toward the umbilicus. * **Management:** It is an obstetric emergency. Immediate delivery (usually via Cesarean Section) is mandatory to prevent maternal uterine rupture and fetal demise. * **Constriction Ring (Schroeder’s Ring):** Do not confuse Bandl’s Ring with a constriction ring. A constriction ring is a localized spasm of uterine muscle that can occur at any level and is not associated with obstructed labor.

Question 737: What is the most life-threatening complication of septic abortion?

A. Peritonitis
B. Renal failure
C. Respiratory distress syndrome (Correct Answer)
D. Septicemia

Explanation: **Explanation:** Septic abortion is a serious clinical condition where an abortion is complicated by infection. While several complications can arise, **Acute Respiratory Distress Syndrome (ARDS)** is considered the most life-threatening. **1. Why Respiratory Distress Syndrome (ARDS) is the correct answer:** In cases of septic abortion, particularly those involving *Clostridium perfringens* or Gram-negative bacteria, endotoxins are released into the bloodstream. These toxins trigger a systemic inflammatory response that increases pulmonary capillary permeability, leading to non-cardiogenic pulmonary edema. ARDS can develop rapidly, often within hours, and carries the highest immediate mortality rate among the listed complications due to refractory hypoxemia and multi-organ failure. **2. Analysis of Incorrect Options:** * **Septicemia (D):** This is the most common cause of death in septic abortion, but it is the *underlying process* rather than a specific terminal complication. ARDS is the specific pathological event within sepsis that most often leads to an acute fatal outcome. * **Renal Failure (B):** Acute Kidney Injury (AKI) is a frequent and severe complication (often due to acute tubular necrosis or hemolysis), but with the availability of hemodialysis, it is generally less immediately fatal than ARDS. * **Peritonitis (A):** While serious and potentially leading to sepsis, peritonitis is a localized or regional spread of infection that is usually manageable with surgical drainage and antibiotics. **Clinical Pearls for NEET-PG:** * **Most common cause of death:** Septicemia. * **Most life-threatening/fatal complication:** ARDS. * **Common organisms:** *E. coli* (most common), *Bacteroides*, and *Clostridium perfringens* (associated with gas gangrene and rapid hemolysis). * **Management Priority:** Stabilization (ABC), high-dose intravenous antibiotics, and prompt evacuation of the uterus (source control).

Question 738: Which of the following is NOT a common cause of placenta accreta?

A. Previous lower segment caesarean section (LSCS)
B. Previous curettage
C. Previous myomectomy
D. Previous abruptio placenta (Correct Answer)

Explanation: **Explanation:** The core pathophysiology of **Placenta Accreta Spectrum (PAS)** is a defect in the **decidua basalis** (specifically the Nitabuch layer), which allows placental villi to invade the myometrium directly. Any condition that causes scarring or damage to the endometrial-myometrial interface increases this risk. **Why "Previous Abruptio Placenta" is the correct answer:** Abruptio placenta is a clinical event where the placenta prematurely separates from the uterine wall *during* a pregnancy. It is a complication of a current or past pregnancy but does **not** cause permanent structural scarring or thinning of the decidua. Therefore, it is not a recognized risk factor for the abnormal adherence seen in placenta accreta. **Why the other options are incorrect (Risk Factors for Accreta):** * **Previous LSCS (Option A):** This is the **most significant risk factor**. The scar tissue lacks a proper decidual layer. The risk increases exponentially with the number of previous sections (e.g., >60% risk if there is placenta previa and 4+ previous LSCS). * **Previous Curettage (Option B):** Vigorous scraping of the uterine cavity (D&C) can damage the basal endometrium, leading to Asherman syndrome or localized decidual deficiency. * **Previous Myomectomy (Option C):** Any surgery that involves opening the uterine cavity or scarring the myometrium creates a site where the decidua may be absent or defective. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Lower uterine segment (due to poor decidualization). * **Strongest Association:** Previous LSCS + Placenta Previa. * **Nitabuch Layer:** The fibrinoid layer between the decidua basalis and the trophoblast that is **absent** in placenta accreta. * **Management:** The gold standard for confirmed PAS is **Planned Cesarean Hysterectomy**.

Question 739: A grand multipara is a woman who has given birth to births:

A. More than 2
B. More than 3
C. More than 4
D. 5 or more (Correct Answer)

Explanation: **Explanation:** The classification of parity is a fundamental concept in obstetrics, used to categorize patients based on their obstetric history and associated clinical risks. **Why the correct answer is right:** According to standard obstetric definitions (Williams Obstetrics and FIGO), a **Grand Multipara** is defined as a woman who has given birth **5 or more times** (at or beyond the period of viability, usually 24-28 weeks depending on the region). These patients are considered "high-risk" because repeated pregnancies can lead to uterine muscle exhaustion and structural changes. **Analysis of Incorrect Options:** * **Options A & B (More than 2 or 3):** These women are simply referred to as "multipara." While they have more than one birth, they do not yet meet the threshold for the "grand" designation. * **Option C (More than 4):** While "more than 4" mathematically equals 5 or more, standard medical terminology specifically uses the numerical threshold of **5** to define the start of grand multiparity. **Clinical Pearls for NEET-PG:** * **Grand Multipara (≥5 births):** Associated with increased risks of **Postpartum Hemorrhage (PPH)** due to uterine atony, malpresentations (due to a lax abdominal wall), and placenta previa. * **Great Grand Multipara:** Defined as a woman who has given birth **10 or more times**. * **Nullipara:** A woman who has never given birth to a viable fetus (Parity 0). * **Primipara:** A woman who has given birth once (Parity 1). * **Important Distinction:** Parity refers to the number of *birth events*, not the number of fetuses. A single twin delivery counts as Parity 1.

Question 740: Which of the following statements is related to rupture uterus?

A. Lower segment scar rarely ruptures during pregnancy.
B. In incomplete rupture, the peritoneal coat remains intact.
C. Classical caesarean scar often ruptures during late pregnancy.
D. Risk of lower segment scar rupture is high compared to classical scar rupture. (Correct Answer)

Explanation: **Explanation:** Uterine rupture is a critical obstetric emergency, most commonly associated with a previous cesarean section scar. **1. Why Option D is Correct:** While classical scars have a higher *percentage* risk of rupture (4–9%), **Lower Segment Cesarean Section (LSCS)** is the most common type of surgery performed globally. Due to the sheer volume of patients with a previous LSCS, the absolute number of ruptures seen in clinical practice is significantly higher for lower segment scars compared to classical scars. Therefore, in a population-based context, the risk/incidence of encountering a lower segment scar rupture is higher. **2. Analysis of Incorrect Options:** * **Option A:** Lower segment scars *can* rupture during pregnancy, though they are more likely to rupture during the trial of labor (intrapartum). * **Option B:** This is the definition of **Incomplete Rupture**. In this condition, the myometrium is breached, but the overlying visceral peritoneum (serosa) remains intact, often forming a subperitoneal hematoma. * **Option C:** This is a true statement (Classical scars often rupture before labor/late pregnancy). However, in the context of NEET-PG competitive questioning, Option D is often prioritized as the "most" clinically relevant statement regarding overall incidence. *(Note: If this were a "Multiple Correct" format, C and D are both technically accurate, but D is the standard keyed answer in many PG exams to emphasize frequency over intensity).* **High-Yield Clinical Pearls for NEET-PG:** * **Classical Scar:** Rupture is often **pre-labor** (late 2nd/early 3rd trimester), sudden, and complete. * **LSCS Scar:** Rupture is usually **intrapartum** (during labor). * **Scar Dehiscence:** A "silent" thinning of the scar without hemorrhage or fetal distress; unlike true rupture, the fetus remains in the cavity. * **Clinical Sign:** The earliest sign of rupture is usually **Fetal Heart Rate abnormalities** (fetal bradycardia), not abdominal pain. * **Bandl’s Ring:** A pathological retraction ring seen in obstructed labor; it is a precursor to impending rupture of the lower segment.

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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