Labor and Delivery — MCQs

A 25-year-old woman with an uncomplicated antenatal period is in labor. She has a single fetus in cephalic presentation. The fetal head is not engaged. Fetal heart rate is 150 beats per minute. Cervical dilatation is 5 cm, membranes are absent, and the pelvis is adequate. A decision is made to perform an immediate caesarean section. Which one of the following findings is the most likely cause for this decision?

Q709Easy

"Conduplicato corpore" indicates spontaneous_____

Q710Medium

What is the management for a patient presenting with central placenta previa at 37 weeks of gestation?

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 701: The latent phase of labor is followed by which phase?

A. Accelerated phase (Correct Answer)
B. Phase of maximum slope
C. Deceleration phase
D. Second stage of labor

Explanation: This question tests your understanding of the **Friedman Curve**, which graphically represents the relationship between cervical dilatation and the duration of labor. ### Explanation of the Correct Answer The first stage of labor is divided into the **Latent Phase** and the **Active Phase**. According to Friedman’s classification, the Active Phase is further subdivided into three distinct functional parts: 1. **Acceleration Phase:** This is the immediate transition from the latent phase where the rate of cervical dilatation begins to increase. 2. **Phase of Maximum Slope:** The period where dilatation occurs at its most rapid rate. 3. **Deceleration Phase:** The final part of the first stage where dilatation slows down just before reaching full dilatation (10 cm). Therefore, the **Acceleration Phase** is the direct successor to the Latent Phase. ### Why Other Options are Incorrect * **B. Phase of Maximum Slope:** This occurs *after* the acceleration phase. * **C. Deceleration Phase:** This is the *final* part of the active phase, occurring just before the second stage. * **D. Second Stage of Labor:** This begins only after full cervical dilatation (10 cm) is achieved, following the completion of all phases of the first stage. ### High-Yield Clinical Pearls for NEET-PG * **Latent Phase Duration:** Prolonged if >20 hours in primigravida or >14 hours in multigravida. * **Active Phase Onset:** Traditionally defined at **4 cm** dilatation (Friedman), though modern WHO/ACOG guidelines (Zhang’s Curve) suggest the active phase starts at **6 cm**. * **Rate of Dilatation:** In the active phase, the minimum expected rate is **1.2 cm/hr** for primigravida and **1.5 cm/hr** for multigravida. * **Friedman Curve Shape:** Sigmoid (S-shaped).

Question 702: Which of the following is the commonest type of presentation in labor?

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

Explanation: **Explanation:** In obstetrics, **presentation** refers to the part of the fetus that lies over the pelvic inlet. The correct answer is **Vertex** because it occurs in approximately **95–96%** of all term pregnancies. **1. Why Vertex is Correct:** The vertex is the area of the fetal skull bounded by the anterior and posterior fontanelles and the parietal eminences. In a normal labor process, the fetal head undergoes **flexion**. This brings the smallest diameter of the fetal head (Suboccipitobregmatic, 9.5 cm) into the maternal pelvis, making it the most efficient and common presentation for a vaginal delivery. **2. Why Other Options are Incorrect:** * **Breech (A):** This occurs when the buttocks or feet are the presenting part. It is seen in only **3–4%** of term pregnancies. * **Shoulder (B):** Associated with a transverse lie, this is rare, occurring in less than **0.5%** of cases. It is an obstetric emergency requiring Cesarean section. * **Face (C):** This occurs when the head is hyper-extended. It is rare, with an incidence of about **1 in 500** deliveries (0.2%). **Clinical Pearls for NEET-PG:** * **Cephalic Presentation:** Includes vertex, face, and brow. Vertex is the most common subtype. * **Most common position:** Left Occipito-Anterior (LOA) is traditionally cited, though Left Occipito-Transverse (LOT) is the most common position at the *onset* of labor. * **Denominator:** For Vertex presentation, the denominator is the **Occiput**. For Breech, it is the **Sacrum**; for Face, it is the **Mentum**; and for Shoulder, it is the **Acromion**.

Question 703: The Pinard's maneuver is seen in which obstetric procedure?

A. Breech deliveries (Correct Answer)
B. As an adjunct to versions and extraction
C. In forceps rotation maneuvers
D. In low cervical stations

Explanation: **Explanation:** **Pinard’s maneuver** is a specific obstetric technique used during the delivery of a **frank breech** presentation to facilitate the decomposition of the breech. In a frank breech, the fetal legs are extended at the knees, which can lead to impaction. The maneuver involves the clinician inserting two fingers along the fetal thigh, pushing it away from the midline (abduction), which results in spontaneous flexion of the knee. This allows the clinician to grasp the fetal foot and bring it down, converting a frank breech into a footling breech for easier extraction. **Analysis of Options:** * **Option A (Correct):** It is the definitive maneuver for decomposing a frank breech when spontaneous descent is delayed. * **Option B:** While versions (like Internal Podalic Version) involve manipulating fetal poles, Pinard’s is specifically defined by the "thigh abduction-knee flexion" mechanism in breech. * **Option C & D:** Forceps rotations (e.g., Kielland’s) and low cervical station procedures involve different instruments and mechanics unrelated to fetal limb manipulation. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisite:** Pinard’s maneuver can only be performed when the cervix is **fully dilated**. * **Løvset maneuver:** Used for delivery of the **extended arms** in breech by rotating the fetus. * **Mauriceau-Smellie-Veit maneuver:** Used for delivery of the **after-coming head** of the breech. * **Burns-Marshall method:** Another technique for the after-coming head where the fetus is allowed to hang to use gravity for descent.

Question 704: The cardinal movements during normal labor occur in which order?

A. Engagement, internal rotation, delivery of head, restitution, external rotation (Correct Answer)
B. Engagement, internal rotation, restitution, delivery of head, external rotation
C. Engagement, delivery of head, internal rotation, restitution, external rotation
D. Engagement, external rotation, delivery of head, internal rotation, restitution

Explanation: **Explanation:** The cardinal movements of labor represent the positional changes the fetus undergoes to navigate the birth canal. The correct sequence is **Engagement → Descent → Flexion → Internal Rotation → Extension (Delivery of Head) → Restitution → External Rotation → Expulsion.** 1. **Engagement:** The widest diameter of the fetal head (biparietal) passes through the pelvic inlet. 2. **Internal Rotation:** The head rotates (usually from transverse to AP) so the occiput lies under the symphysis pubis. 3. **Delivery of Head (Extension):** As the head reaches the pelvic floor, it extends to emerge from the vulva. 4. **Restitution:** Once the head is born, it rotates 45° to realign with the shoulders, which are still in the oblique diameter of the pelvis. 5. **External Rotation:** As the shoulders rotate internally to the AP diameter, the head rotates another 45° externally. **Why other options are wrong:** * **Option B:** Places restitution before the delivery of the head. Restitution is a corrective movement that can only occur *after* the head is free from the birth canal. * **Option C:** Places internal rotation after the delivery of the head. Internal rotation is essential for the head to pass under the pubic arch. * **Option D:** Places external rotation before the delivery of the head, which is anatomically impossible. **High-Yield Clinical Pearls for NEET-PG:** * **Engagement** is defined when the biparietal diameter (9.5 cm) crosses the pelvic inlet; clinically, the leading bony part is at the level of the **ischial spines (Station 0)**. * **Restitution** is always in the opposite direction of internal rotation. * The **crowning** occurs when the maximum diameter of the head stretches the vulval outlet without receding between contractions. * The most common position for engagement is **Left Occipito-Transverse (LOT)**.

Question 705: Painless bleeding in the third trimester is a feature of which of the following conditions?

A. Placenta previa (Correct Answer)
B. Abruptio placenta
C. Vesicular mole
D. None of the above

Explanation: **Explanation:** The hallmark of **Placenta Previa** is **painless, bright red, and causative-less (spontaneous) vaginal bleeding** in the third trimester. This occurs because, as the lower uterine segment stretches and the cervix begins to efface or dilate, the placental attachments are disrupted, leading to bleeding from the maternal venous sinuses. Since the bleeding is external and not associated with uterine contractions or retroplacental pressure, it remains painless. **Analysis of Options:** * **Abruptio Placenta:** This is characterized by **painful** vaginal bleeding. The pain is due to the formation of a retroplacental hematoma and subsequent uterine irritability or tetanic contractions. The blood is often dark red (non-oxygenated). * **Vesicular Mole:** While this causes vaginal bleeding, it typically presents in the **first or early second trimester** (usually before 20 weeks). It is associated with "white currant" vesicles and disproportionately high hCG levels, rather than third-trimester bleeding. **High-Yield NEET-PG Pearls:** 1. **The "Golden Rule":** Never perform a per-vaginal (PV) examination in a case of third-trimester bleeding until Placenta Previa is ruled out by ultrasound, as it can provoke torrential hemorrhage (Stallworthy’s sign). 2. **Double Setup Examination:** If a vaginal exam is necessary, it must be done in the operating theater with preparations for an immediate Cesarean section. 3. **Classification:** Placenta previa is classified into four types (I-IV), with Type II posterior being known as the "Dangerous Placenta Previa" because it can compress the cord against the sacral promontory.

Question 706: What is the diameter of engagement in a face presentation?

A. Submentobregmatic (Correct Answer)
B. Submentooccipital
C. Biparietal
D. Bitemporal

Explanation: In a **face presentation**, the fetal head is in a state of **complete hyperextension**. This orientation changes the presenting part and the diameters involved in engagement compared to a normal vertex presentation. ### Why Submentobregmatic is Correct In face presentation, the **mentum (chin)** is the denominator. For the head to engage and pass through the pelvic brim, the smallest diameter of the hyperextended head must present. This is the **Submentobregmatic diameter**, which measures approximately **9.5 cm**. It extends from the junction of the chin and neck to the center of the bregma (anterior fontanelle). Since this diameter is the same length as the suboccipitobregmatic diameter (in well-flexed vertex), a vaginal delivery is possible if the mentum is anterior. ### Analysis of Incorrect Options * **Submentooccipital (11.5 cm):** This diameter extends from the chin to the occipital protuberance. It is the presenting diameter when the head is only partially extended (incomplete extension). * **Biparietal (9.5 cm):** While this is the widest transverse diameter of the fetal skull, it is not the longitudinal diameter of engagement that characterizes the degree of extension/flexion in face presentation. * **Bitemporal (8.0 cm):** This is the shortest transverse diameter between the temples; it is not the primary diameter of engagement. ### High-Yield Clinical Pearls for NEET-PG * **Denominator:** Mentum (Chin). * **Most common cause:** Anencephaly (due to lack of cranial vault). * **Mechanism of Labor:** Engagement occurs in the submentobregmatic diameter. Internal rotation must occur so the mentum moves **anteriorly** (Mentum Anterior) for vaginal delivery to be possible. * **Contraindication:** A **Persistent Mentum Posterior** cannot be delivered vaginally because the short fetal neck cannot navigate the long sacral curve; this requires a Cesarean section.

Question 707: A primigravida patient presents in the second stage of labor with a breech presentation. What is the most appropriate management?

A. Immediate cesarean section
B. Forceps application
C. Watchful expectancy (Correct Answer)
D. Internal podalic version

Explanation: **Explanation:** In the management of a vaginal breech delivery, the cardinal rule is **"hands off the breech."** Once the patient reaches the second stage of labor, the most appropriate management is **watchful expectancy** (Option C). This involves allowing the fetus to deliver spontaneously by maternal effort and gravity up to the level of the umbilicus. Premature intervention or traction can cause fetal extension of the arms or head, leading to entrapment and increased morbidity. **Analysis of Incorrect Options:** * **Option A (Immediate Cesarean Section):** While many breech presentations are delivered via elective CS, once a patient is in the second stage of labor with the breech crowning or descending well, a vaginal delivery is often safer and more practical than an emergency CS. * **Option B (Forceps application):** Forceps (specifically Piper’s forceps) are used only for the **after-coming head** of the breech, not for the delivery of the body or during the initial phase of the second stage. * **Option D (Internal Podalic Version):** This procedure is contraindicated in a singleton breech. It is primarily reserved for the delivery of a **second twin** in a transverse or oblique lie. **High-Yield Clinical Pearls for NEET-PG:** * **Burn-Marshall Maneuver:** Used for the delivery of the after-coming head (fetus is allowed to hang by its own weight). * **Løvset Maneuver:** Used for the delivery of extended arms. * **Mauriceau-Smellie-Veit Maneuver:** Used for delivery of the after-coming head (promotes flexion). * **Prerequisite for Vaginal Breech:** Frank or complete breech, fetal weight 2.5–3.5 kg, and an adequate maternal pelvis.

Question 708: A 25-year-old woman with an uncomplicated antenatal period is in labor. She has a single fetus in cephalic presentation. The fetal head is not engaged. Fetal heart rate is 150 beats per minute. Cervical dilatation is 5 cm, membranes are absent, and the pelvis is adequate. A decision is made to perform an immediate caesarean section. Which one of the following findings is the most likely cause for this decision?

A. Approximation of the suture lines
B. Palpation of the anterior fontanelle and the sagittal suture
C. Palpation of the eyes, nose, and mouth
D. Palpation of the frontal bones and the supraorbital ridges (Correct Answer)

Explanation: The correct answer is **D. Palpation of the frontal bones and the supraorbital ridges.** ### **Explanation** The clinical scenario describes a patient in labor with a non-engaged head and a decision for an immediate Caesarean section. The key to this question lies in identifying a **malpresentation** that is incompatible with vaginal delivery. * **Brow Presentation:** Palpation of the frontal bones, supraorbital ridges, and the root of the nose indicates a brow presentation. In this position, the presenting diameter is the **mentovertical (13.5 cm)**, which is the largest diameter of the fetal head. Since this diameter exceeds the average pelvic dimensions, the head cannot engage, and vaginal delivery is impossible unless the presentation converts to vertex or face. Immediate C-section is the standard management for a persistent brow presentation in labor. ### **Analysis of Incorrect Options** * **A. Approximation of suture lines:** This describes **molding (Grade 1)**. It is a physiological adaptation of the fetal head to the birth canal and is not an indication for a C-section. * **B. Palpation of anterior fontanelle and sagittal suture:** This is a normal finding in a **vertex presentation** (specifically, a deflexed head or occipitoposterior position). While it may slow labor, it does not mandate an immediate C-section. * **C. Palpation of eyes, nose, and mouth:** This indicates a **face presentation**. If the mentum (chin) is anterior, vaginal delivery is possible. A C-section is only mandatory if the mentum is posterior (mento-posterior). ### **NEET-PG High-Yield Pearls** * **Brow Presentation:** Presenting part is between the orbital ridges and the anterior fontanelle. Diameter: **Mentovertical (13.5 cm)**. * **Face Presentation:** Presenting part is from the orbital ridges to the chin. Diameter: **Submentobregmatic (9.5 cm)**. * **Vertex Presentation:** Diameter: **Suboccipitobregmatic (9.5 cm)**. * **Rule of Thumb:** If the mentum is posterior in a face presentation, or if the brow presentation persists, the delivery must be by Caesarean section.

Question 709: "Conduplicato corpore" indicates spontaneous_____

A. Version
B. Rectification
C. Evolution
D. Expulsion (Correct Answer)

Explanation: **Explanation:** **Conduplicato corpore** is a mechanism of **spontaneous expulsion** that occurs in cases of a neglected transverse lie, usually involving a dead, macerated, or premature fetus. 1. **Why "Expulsion" is correct:** In this rare mechanism, the fetus is small or flexible enough to be folded upon itself. The head and the thorax are compressed against the abdomen, and the fetus is delivered "doubled up" (conduplicato). The spine is acutely flexed, and the head and abdomen emerge simultaneously through the birth canal. This is distinct from other mechanisms where the fetus undergoes internal rotation to a longitudinal lie. 2. **Why other options are incorrect:** * **Spontaneous Version:** This refers to the fetus changing its polarity (e.g., from transverse to cephalic or breech) while still inside the uterus before or during early labor. * **Spontaneous Rectification:** This is the process where a transverse lie corrects itself into a longitudinal lie (usually cephalic) after the membranes rupture or as labor begins. * **Spontaneous Evolution (Douglas’ Method):** This is another mechanism of spontaneous delivery in transverse lie where the fetus is delivered in a specific sequence: the shoulder engages, followed by the thorax, the breech, and finally the head. Unlike *conduplicato corpore*, the fetus is not folded "doubled up." **High-Yield Facts for NEET-PG:** * **Prerequisites:** For spontaneous expulsion to occur, the pelvis must be roomy, the fetus must be small/macerated, and uterine contractions must be strong. * **Denys-Negrier Method:** Another term sometimes associated with the stages of spontaneous evolution. * **Clinical Management:** In a modern obstetric setting, a transverse lie in labor is managed by **Cesarean Section** to prevent maternal complications like obstructed labor and uterine rupture.

Question 710: What is the management for a patient presenting with central placenta previa at 37 weeks of gestation?

A. Vaginal delivery with artificial rupture of membranes
B. Elective cesarean section (Correct Answer)
C. Cesarean section when bleeding starts
D. Conservative management and wait until 38 weeks of gestation

Explanation: **Explanation:** **1. Why Option B is Correct:** Central (Type IV/Total) placenta previa occurs when the placenta completely covers the internal os. At 37 weeks, the fetus is considered full-term. In central placenta previa, vaginal delivery is physically impossible and life-threatening due to the risk of catastrophic maternal hemorrhage as the cervix dilates. Therefore, an **elective cesarean section** is the definitive management once fetal maturity is reached (typically scheduled between 36-37 weeks) to prevent spontaneous labor or bleeding. **2. Why Other Options are Incorrect:** * **Option A:** Vaginal delivery is contraindicated in central placenta previa. Artificial rupture of membranes (ARM) is only considered in low-lying placenta (Type I) where the fetal head can compress the placental edge to control bleeding. * **Option C:** Waiting for bleeding to start is dangerous. Management aims to be proactive; emergency surgery carries higher morbidity than an elective, controlled procedure. * **Option D:** Conservative management (Macafee-Johnson regime) is indicated only for preterm patients (<37 weeks) who are hemodynamically stable, to gain fetal maturity. At 37 weeks, there is no benefit to further delay. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) is safer and more accurate than transabdominal ultrasound for locating the placental edge. * **The "Double Setup" Examination:** Only performed in the OT for borderline cases (Type I/II anterior); it is strictly contraindicated in known central previa. * **Stallworthy’s Sign:** A drop in fetal heart rate when the head is pressed into the pelvis, seen in posterior placenta previa. * **Warning Hemorrhage:** The first episode of bleeding in placenta previa is usually painless, causeless, and recurrent.

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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