Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 21: Which of the following is the most common predisposing factor for placenta accreta?

A. Myomectomy
B. Recent curettage
C. Previous cesarean section
D. Placenta previa (Correct Answer)

Explanation: **Explanation:** **Placenta accreta** occurs due to a defect in the **decidua basalis**, specifically the absence of the Nitabuch layer, which allows chorionic villi to invade the myometrium directly. **Why Placenta Previa is the correct answer:** While several factors can cause decidual deficiency, **placenta previa** is statistically the most significant predisposing factor. When the placenta implants in the lower uterine segment, the decidua is naturally thinner and less vascularized than in the upper segment, facilitating abnormal adherence. The risk is synergistically increased if a patient has both placenta previa and a previous uterine scar. **Analysis of Incorrect Options:** * **Previous Cesarean Section (C):** This is a major risk factor, but it is the *combination* of a previous C-section with a current placenta previa that poses the highest risk. In isolation, placenta previa remains the most common clinical association found in accreta cases. * **Recent Curettage (B) & Myomectomy (A):** These involve uterine trauma that can lead to localized decidual defects. While they are recognized risk factors, they are statistically less common causes of placenta accreta compared to the implantation site issues seen in placenta previa. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Correlation:** If a patient has placenta previa and 1 previous C-section, the risk of accreta is ~11%. With 4 or more C-sections and previa, the risk jumps to **>60%**. * **Management:** The gold standard management for confirmed placenta accreta is a **planned cesarean hysterectomy**. * **Diagnosis:** Antenatal diagnosis is primarily via **Color Doppler Ultrasound** (showing loss of retroplacental clear zone and bladder wall irregularities).

Question 22: All of the following are contraindications for trial of labor except?

A. Breech presentation
B. Outlet contraction
C. Primi gravida (Correct Answer)
D. Post cesarean pregnancy

Explanation: **Explanation:** The core concept of a **Trial of Labor (TOL)** is the assessment of the mother’s ability to deliver vaginally under medical supervision when there is some degree of uncertainty regarding the success of labor. **Why Primi gravida is the correct answer:** Being a **primigravida** (a woman pregnant for the first time) is a physiological state, not a pathology. It is never a contraindication to labor; in fact, labor is the standard management for most primigravidas unless specific obstetric complications arise. While labor may be longer in primigravidas, it is the expected clinical course. **Analysis of Incorrect Options (Contraindications):** * **Breech presentation:** While not an absolute contraindication in all settings, it is often considered a contraindication for a standard TOL in modern practice (especially in primigravidas or footling breech) due to the high risk of cord prolapse and head entrapment. * **Outlet contraction:** A contracted pelvis (at the inlet, mid-pelvis, or outlet) is an absolute contraindication for TOL. If the bony dimensions are insufficient for the fetal head to pass, labor will result in obstruction and potential rupture. * **Post-cesarean pregnancy:** While a Trial of Labor After Cesarean (TOLAC) is possible in specific cases (e.g., one previous lower segment incision), it is contraindicated if there is a history of classical incision, uterine rupture, or other contraindications to vaginal birth. In the context of this question, a previous scar often serves as a relative or absolute contraindication depending on the clinical scenario. **High-Yield Clinical Pearls for NEET-PG:** * **TOL vs. TOLAC:** TOL is usually used for suspected Cephalopelvic Disproportion (CPD), while TOLAC is specific to post-CS patients. * **Prerequisites for TOL:** Must be a vertex presentation, spontaneous onset of labor, and a borderline pelvis. * **Contraindications for TOL:** Contracted pelvis, malpresentations (transverse/oblique), placenta previa, and prior classical CS. * **Success Indicator:** The best evidence of a successful TOL is the progressive effacement and dilatation of the cervix.

Question 23: What is the most important component of the Bishop score?

A. Position
B. Dilatation (Correct Answer)
C. Station
D. Effacement

Explanation: **Explanation:** The **Bishop Score** (also known as the Pelvic Score) is a clinical tool used to predict the likelihood of a successful vaginal delivery following the induction of labor. It assesses five components: Cervical Dilatation, Effacement, Consistency, Position, and Fetal Station. **Why Dilatation is the correct answer:** Among the five parameters, **Cervical Dilatation** is considered the most important and objective predictor of successful induction. It carries the highest weightage in clinical decision-making because it represents the most significant physiological change required for the onset of the active phase of labor. Studies have shown that dilatation has the highest correlation with the duration of labor and the probability of achieving a vaginal delivery. **Analysis of Incorrect Options:** * **Effacement:** While a critical indicator of cervical ripening (thinning), it is secondary to dilatation in predicting the immediate success of induction. * **Station:** This refers to the position of the fetal presenting part relative to the ischial spines. While it indicates fetal descent, it is less reflective of cervical readiness than dilatation. * **Position:** This refers to the orientation of the cervix (Posterior, Mid-position, or Anterior). It is the least objective and least significant parameter in the scoring system. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic to remember components:** **"S**tation, **D**ilatation, **E**ffacement, **P**osition, **C**onsistency" (**SDEPC**). * **Score Interpretation:** A score of **≥8** suggests a high likelihood of successful vaginal delivery (comparable to spontaneous labor). A score of **≤6** indicates an "unripe" cervix, often requiring cervical ripening agents (e.g., Dinoprostone/PGE2). * **Maximum Score:** 13. * **Modified Bishop Score:** Often replaces effacement (percentage) with **cervical length (cm)** for more objective measurement.

Question 24: Depending on the extension of the placenta into the lower uterine segment, a central placenta is classified as which type?

A. Type 1
B. Type 2
C. Type 3
D. Type 4 (Correct Answer)

Explanation: **Explanation:** Placenta previa is classified based on the relationship between the placenta and the internal os of the cervix. The classification used is the **Browne’s Classification**, which divides it into four types: * **Type 4 (Total/Central):** The placenta completely covers the internal os, even when the cervix is fully dilated. This is the most severe form and carries the highest risk of life-threatening hemorrhage. Delivery is exclusively by Cesarean section. **Analysis of Incorrect Options:** * **Type 1 (Low-lying):** The lower edge of the placenta reaches the lower uterine segment but does not reach the internal os. Vaginal delivery is usually possible. * **Type 2 (Marginal):** The placenta reaches the margin of the internal os but does not cover it. This is further divided into 2a (Anterior) and 2b (Posterior). Type 2b is known as "Dangerous Placenta Previa" because it can compress the cord against the sacral promontory. * **Type 3 (Incomplete/Partial Central):** The placenta covers the internal os when closed, but only partially covers it when the cervix begins to dilate. **High-Yield Clinical Pearls for NEET-PG:** * **Stallworthy’s Sign:** Associated with **Type 2 Posterior** placenta previa; the fetal head remains high and mobile, and pressure on the head causes fetal bradycardia due to cord compression. * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) is safer and more accurate than transabdominal ultrasound for locating the placental edge. * **Management:** The "Expectant Management" (MacAfee regime) is followed until 37 weeks if the mother is stable and the fetus is preterm. * **Contraindication:** Digital vaginal examination (PV) is strictly contraindicated in suspected cases unless performed in the OT under "Double Setup" conditions.

Question 25: Which is the most significant finding in cardiotocography for the detection of fetal hypoxia?

A. Late deceleration (Correct Answer)
B. Variable deceleration
C. Sinusoidal deceleration
D. Early deceleration

Explanation: **Explanation:** **Late Deceleration (Correct Answer):** Late decelerations are the most significant CTG finding for detecting fetal hypoxia. They are characterized by a gradual decrease in fetal heart rate (FHR) that begins *after* the peak of a uterine contraction and returns to baseline only after the contraction has ended. This "lag" occurs because uterine contractions temporarily reduce maternal blood flow to the placenta. In a fetus with **uteroplacental insufficiency**, this reduction pushes the fetal $PO_2$ below the critical threshold, triggering chemoreceptors and causing a reflex bradycardia. Persistent late decelerations indicate a lack of fetal reserve and are a hallmark of metabolic acidosis. **Incorrect Options:** * **Variable Deceleration:** These are abrupt drops in FHR, often V-shaped, caused by **umbilical cord compression**. While common, they are only concerning if they become "atypical" or persistent, but they are not the primary indicator of hypoxia. * **Sinusoidal Pattern:** This is a smooth, wave-like pattern indicating severe fetal anemia (e.g., Rh isoimmunization) or acute hemorrhage. While ominous, it is a specific sign of volume/hemoglobin loss rather than the standard marker for hypoxic labor. * **Early Deceleration:** These are "mirror images" of contractions caused by **fetal head compression**. They are considered physiological (benign) and do not indicate hypoxia. **High-Yield Clinical Pearls for NEET-PG:** * **Early Deceleration:** Head compression (Vagal reflex). * **Variable Deceleration:** Cord compression. * **Late Deceleration:** Uteroplacental insufficiency (Hypoxia). * **Reassuring CTG:** Presence of **accelerations** (15 bpm for 15 seconds) and good **beat-to-beat variability** (6–25 bpm). * **Management:** For persistent late decelerations, the first steps are maternal lateral positioning, oxygen, and hydration; if uncorrected, urgent delivery is indicated.

Question 26: Least chances of cord prolapse are seen with which presentation?

A. Frank breech (Correct Answer)
B. Complete breech
C. Footling breech
D. Knee presentation

Explanation: **Explanation:** The risk of umbilical cord prolapse is directly proportional to how effectively the presenting part occupies the lower uterine segment and fills the pelvic inlet. If there is a poor "fit" between the presenting part and the cervix, the cord can slip down past the fetus when the membranes rupture. **1. Why Frank Breech is the Correct Answer:** In a **Frank breech** (thighs flexed, legs extended at the knees), the fetal buttocks form a broad, smooth, and firm presenting part. This "bitrochanteric diameter" fits snugly into the lower uterine segment, acting as an effective wedge that prevents the cord from slipping through. The incidence of cord prolapse in frank breech is approximately **0.5%**, which is nearly as low as in cephalic presentations. **2. Analysis of Incorrect Options:** * **Complete Breech (Option B):** Here, both thighs and legs are flexed. The presenting part is irregular and does not fill the cervix as efficiently as a frank breech, leading to a higher risk (approx. **4-5%**). * **Footling Breech (Option C):** One or both feet are the presenting part. This creates significant empty space in the pelvic inlet, allowing the cord to easily prolapse. This carries the highest risk among breeches (approx. **15%**). * **Knee Presentation (Option D):** Similar to footling breech, the knees are narrow and irregular, failing to occlude the cervix and posing a high risk for prolapse. **NEET-PG High-Yield Pearls:** * **Highest risk of cord prolapse:** Transverse lie (especially when membranes rupture). * **Most common cause of cord prolapse:** Prematurity (due to small fetal size). * **Management:** If cord prolapse occurs, the immediate step is to place the patient in the **Trendelenburg or Knee-chest position** and perform an emergency Cesarean section. Manual replacement of the cord is contraindicated.

Question 27: Which of the following is NOT a true sign of placental separation?

A. Fresh bleeding per vaginum
B. Firmness of the fundus
C. Permanent lengthening of the umbilical cord
D. A round, flabby uterus (Correct Answer)

Explanation: **Explanation:** The third stage of labor involves the separation and expulsion of the placenta. For successful separation and the prevention of Postpartum Hemorrhage (PPH), the uterus must undergo vigorous contraction and retraction. **Why "A round, flabby uterus" is the correct answer:** Following placental separation, the uterus becomes **firm, globular, and hard** (like a cricket ball) because the myometrium contracts to compress the intramyometrial blood vessels (the "living ligatures"). A **flabby** uterus indicates uterine atony, which is a pathological state and a leading cause of PPH, rather than a sign of healthy placental separation. **Analysis of Incorrect Options:** * **Fresh bleeding per vaginum:** As the placenta separates from the uterine wall, the retroplacental retro-hematoma escapes, causing a sudden gush of fresh blood. * **Firmness of the fundus:** As discussed, the uterus contracts strongly to facilitate separation and minimize blood loss, leading to a firm, globular feel on palpation. * **Permanent lengthening of the umbilical cord:** As the placenta detaches and descends into the lower uterine segment or vagina, the cord visible at the vulva advances further out. This lengthening is permanent and does not retract when the uterus is pushed upward (Schroeder's sign). **NEET-PG High-Yield Pearls:** 1. **Classical Signs of Separation:** * **Suprapubic Bulge:** Due to the placenta descending into the lower segment. * **Fundal Rise:** The fundus rises to the level of the umbilicus and shifts to the right. 2. **Calkin’s Sign:** The change in uterine shape from discoid to globular and firm. 3. **Modified Brandt-Andrews Maneuver:** Used to deliver the placenta once these signs are confirmed; involves controlled cord traction while providing counter-traction to the uterus to prevent inversion.

Question 28: Mrs. S (G2 L1) presented to the hospital in labor pains. On examination she had 3 uterine contractions of 20 seconds in 10 minutes, cervical dilation 6 cm and HR 145 bpm. What is the stage of labor?

A. Stage I (Correct Answer)
B. Stage II
C. Stage III
D. Stage IV

Explanation: ### Explanation The correct answer is **Stage I**. **1. Why Stage I is correct:** Labor is divided into four distinct stages based on physiological milestones. **Stage I (Cervical Stage)** begins with the onset of true labor pains and ends with **full cervical dilation (10 cm)**. In this clinical scenario, Mrs. S has a cervical dilation of **6 cm**. Since she has not yet reached full dilation, she is currently in the **Active Phase of Stage I**. The presence of regular uterine contractions (3 in 10 minutes) further confirms she is in active labor. **2. Why the other options are incorrect:** * **Stage II (Expulsive Stage):** This stage begins from full cervical dilation (10 cm) and ends with the delivery of the fetus. Since the patient is only at 6 cm, she has not entered this stage. * **Stage III (Placental Stage):** This stage begins after the delivery of the fetus and ends with the expulsion of the placenta and membranes. * **Stage IV:** This is the observation period (usually 1–2 hours) immediately following the delivery of the placenta to monitor for postpartum hemorrhage (PPH). **3. NEET-PG High-Yield Pearls:** * **Stage I Phases:** Divided into the **Latent Phase** (0 to <6 cm) and the **Active Phase** (6 cm to 10 cm), according to recent WHO/ACOG guidelines (previously 4 cm was the threshold). * **Friedman’s Curve:** Historically used to track labor progress; however, modern practice uses the **WHO Labor Care Guide**. * **Duration:** In a multigravida (like Mrs. S, G2L1), Stage I is typically shorter (approx. 6–8 hours) compared to a primigravida (approx. 10–12 hours). * **Fetal Heart Rate (FHR):** The normal range is 110–160 bpm. Mrs. S’s HR of 145 bpm is reassuring.

Question 29: Massive postpartum hemorrhage may warrant all interventions except:

A. Hysterectomy
B. Thermal endometrial ablation (Correct Answer)
C. Internal iliac artery ligation
D. Balloon tamponade

Explanation: **Explanation:** In the management of massive postpartum hemorrhage (PPH), the primary goal is to achieve rapid hemodynamic stability and arrest bleeding. **Why Thermal Endometrial Ablation is the Correct Answer:** Thermal endometrial ablation is a **contraindication** in the acute management of PPH. It is a procedure used for the elective treatment of chronic heavy menstrual bleeding (menorrhagia) in non-pregnant women. In the context of PPH, the uterus is large, thin-walled, and often contains clots or retained products; using thermal energy in such a state carries a high risk of uterine perforation and visceral injury. Furthermore, it is ineffective against the deep-seated vascular bleeding characteristic of PPH. **Analysis of Incorrect Options:** * **Balloon Tamponade (e.g., Bakri Balloon):** This is a first-line surgical/procedural intervention for uterine atony. It exerts hydrostatic pressure against the uterine wall to compress bleeding vessels. * **Internal Iliac Artery Ligation:** A life-saving surgical step that reduces pelvic arterial pressure by approximately 85%, thereby slowing the hemorrhage. * **Hysterectomy:** This is the **definitive** management for intractable PPH when conservative medical and surgical measures (like compression sutures or devascularization) fail. **Clinical Pearls for NEET-PG:** * **Stepwise Management:** Medical (Oxytocin/Carboprost) → Mechanical (Tamponade) → Surgical (B-Lynch sutures/Devascularization) → Hysterectomy. * **Internal Iliac Ligation:** The ligature is applied to the **anterior division** of the internal iliac artery to preserve blood supply to the posterior pelvic wall. * **Definitive Treatment:** For Morbidly Adherent Placenta (Placenta Accreta/Percreta) causing PPH, the treatment of choice is often a planned or emergency Hysterectomy.

Question 30: A 37-week primigravida patient presents with uterine contractions for 10 hours. On examination, the cervix is 1 cm dilated and poorly effaced. What is the most appropriate management?

A. Cesarean section
B. Amniotomy
C. Oxytocin drip
D. Sedation and expectant management (Correct Answer)

Explanation: ### Explanation The patient is in the **Latent Phase of Labor**. According to the Friedman curve and modern labor standards, the latent phase is characterized by slow cervical change (up to 4–6 cm dilation) and regular contractions. **Why Option D is Correct:** A primigravida with only 1 cm dilation and poor effacement after 10 hours of contractions is likely experiencing a **Prolonged Latent Phase** (defined as >20 hours in primigravida). The standard management for a prolonged latent phase is **therapeutic rest (sedation)** or **oxytocin augmentation**. In the initial stages of a slow latent phase without maternal or fetal distress, sedation (e.g., Morphine or Pethidine) allows the patient to rest. Often, the patient will either wake up in active labor or the contractions will cease (indicating false labor), avoiding unnecessary interventions. **Why Other Options are Incorrect:** * **A. Cesarean Section:** This is contraindicated as there is no evidence of fetal distress or cephalopelvic disproportion. A C-section should not be performed for a prolonged latent phase alone. * **B. Amniotomy:** Artificial rupture of membranes (ARM) is generally reserved for the **active phase** of labor to augment progress. Performing it too early increases the risk of cord prolapse and infection. * **C. Oxytocin Drip:** While oxytocin is an option for a prolonged latent phase, conservative management with sedation is often preferred first to differentiate between false labor and the latent phase, reducing the risk of "failed induction" leading to a C-section. ### High-Yield Clinical Pearls for NEET-PG: * **Latent Phase Limits:** >20 hours in Primigravida; >14 hours in Multigravida. * **Active Phase Start:** Traditionally 4 cm, but modern WHO/ACOG guidelines suggest **6 cm** dilation. * **Active Phase Arrest:** No cervical change for ≥4 hours with adequate contractions or ≥6 hours with inadequate contractions. * **Management Priority:** Always rule out **False Labor** before diagnosing a prolonged latent phase.

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

Practice Questions

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