Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 561: Which of the following is a contraindication for a trial of labor?

A. Mid pelvic contraction
B. Postmaturity
C. Post-cesarean pregnancy
D. All of the above (Correct Answer)

Explanation: **Explanation:** A **Trial of Labor (TOL)** is the clinical management of a patient with a borderline pelvic contraction or a previous cesarean section, allowing labor to proceed under close supervision to determine if a vaginal delivery is possible. **Why "All of the Above" is correct:** In clinical practice, a Trial of Labor is specifically contraindicated when there is a high risk of maternal or fetal morbidity. * **Mid-pelvic contraction:** Unlike an inlet contraction (where a trial is often attempted), a mid-pelvic contraction is a **contraindication**. If the head is arrested at this level, it often requires difficult high-forceps delivery, which is obsolete and dangerous. * **Postmaturity:** Post-term pregnancy is a contraindication because the fetal skull bones are more ossified and less likely to "mold" to the birth canal. Additionally, placental insufficiency and macrosomia increase the risk of fetal distress and shoulder dystocia during a trial. * **Post-cesarean pregnancy:** While a "Trial of Labor After Cesarean" (TOLAC) is common, it is contraindicated if the previous incision was **classical (vertical)**, inverted T-shaped, or if there is a history of uterine rupture, due to the high risk of scar dehiscence. **Clinical Pearls for NEET-PG:** * **Inlet Contraction:** Trial of labor is most commonly indicated here (the "wait and watch" approach). * **Outlet Contraction:** Trial of labor is **never** given; it is a contraindication as it often leads to severe perineal tears. * **Prerequisites for TOL:** Must be a vertex presentation, spontaneous onset of labor is preferred, and facilities for an emergency cesarean must be available within 30 minutes. * **Success of TOL:** Approximately 70-80% of women undergoing TOLAC achieve a successful vaginal birth (VBAC).

Question 562: Which of the following agents is used for cervical ripening?

A. Dinoprostone gel
B. Misoprostol tablets
C. Hyaluronic acid
D. All the above (Correct Answer)

Explanation: Cervical ripening is the process of softening, thinning, and dilating the cervix before the onset of labor, typically assessed using the **Bishop score**. A score of ≤6 indicates an unfavorable cervix requiring ripening agents. **Explanation of Options:** * **Dinoprostone (PGE2):** This is the gold standard for cervical ripening. It is available as a vaginal gel (0.5 mg) or a slow-release vaginal insert (10 mg). It acts by breaking down collagen networks and increasing submucosal water content. * **Misoprostol (PGE1):** A synthetic prostaglandin E1 analogue. While primarily used for induction of labor (25 mcg vaginally), it is highly effective for ripening. It is cost-effective and stable at room temperature, making it widely used in clinical practice. * **Hyaluronic Acid:** This is a newer biochemical approach. Hyaluronic acid is a major component of the extracellular matrix; its concentration increases naturally during spontaneous ripening. Exogenous application promotes cervical softening by increasing tissue hydration and reorganizing collagen fibers. **Why "All the above" is correct:** All three agents utilize different biochemical pathways (prostaglandin-mediated or direct matrix modification) to decrease cervical resistance, making them valid options for ripening. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanical methods:** Foley’s catheter bulb induction is an alternative for ripening, especially in women with a previous C-section (where prostaglandins are contraindicated due to rupture risk). * **Side Effects:** Misoprostol carries a higher risk of **uterine tachysystole** compared to Dinoprostone. * **Contraindication:** Prostaglandins should be avoided in patients with a history of major uterine surgery or classical cesarean section.

Question 563: Which of the following is a recurrent indication for cesarean delivery?

A. Breech presentation
B. Placenta previa
C. Pelvic deformity (Correct Answer)
D. Fetal distress

Explanation: ### Explanation The core concept behind this question is distinguishing between **recurrent** and **non-recurrent** indications for a Cesarean Section (CS). **Why Pelvic Deformity is Correct:** A **recurrent indication** is a permanent anatomical or physiological condition that persists from one pregnancy to the next, making a vaginal delivery consistently unsafe or impossible. **Pelvic deformity** (e.g., contracted pelvis due to rickets, osteomalacia, or previous pelvic fractures) is a structural abnormality. Since the bony architecture of the pelvis does not change between pregnancies, a patient with a pelvic deformity will require a repeat CS in all subsequent deliveries. **Analysis of Incorrect Options:** * **Breech presentation:** This is a **non-recurrent** indication. Malpresentation in one pregnancy does not mean the fetus will be breech in the next; most subsequent pregnancies will have a cephalic presentation. * **Placenta previa:** This is a transient placental implantation site specific to a single pregnancy. The risk of recurrence is low (approx. 4–8%), making it a **non-recurrent** indication. * **Fetal distress:** This is an acute, event-specific indication related to the fetal response to the labor process of a specific pregnancy. It is highly unlikely to recur under normal circumstances in a subsequent labor. **High-Yield Clinical Pearls for NEET-PG:** * **Common Recurrent Indications:** Contracted pelvis (CPD), pelvic tumors obstructing the birth canal, and previous classical CS (due to high risk of rupture). * **VBAC (Vaginal Birth After Cesarean):** Is generally considered for patients with one previous lower segment CS (LSCS) for a **non-recurrent** indication (like fetal distress or breech). * **Absolute Contraindication for VBAC:** Previous classical CS, previous hysterotomy, or any permanent pelvic obstruction.

Question 564: What test is used to differentiate between maternal and fetal blood in a given sample?

A. Kleihauer-Betke test
B. Osmotic fragility test
C. Apt test (Correct Answer)
D. Bubbling test

Explanation: **Explanation:** The **Apt test** (Alkali denaturation test) is the gold standard for differentiating between fetal and maternal blood, typically used in cases of vaginal bleeding during late pregnancy (e.g., suspected vasa previa) or when a newborn vomits blood. **Why the Apt test is correct:** The test relies on the biochemical difference between **Fetal Hemoglobin (HbF)** and **Adult Hemoglobin (HbA)**. When sodium hydroxide (NaOH) is added to the blood sample, HbA (maternal) is denatured and turns **yellow-brown**, whereas HbF (fetal) is resistant to alkali denaturation and remains **pink**. This allows for rapid identification of the source of bleeding. **Analysis of Incorrect Options:** * **A. Kleihauer-Betke test:** This test also differentiates HbF from HbA but is used to **quantify** the amount of fetal-maternal hemorrhage (FMH) in the maternal circulation. It is an acid-elution test used to calculate the required dose of Anti-D prophylaxis. * **B. Osmotic fragility test:** This is used to diagnose **Hereditary Spherocytosis**, measuring the resistance of red blood cells to hemolysis in varying concentrations of saline. * **D. Bubbling test (Shake test):** This is a bedside test used to assess **fetal lung maturity** by checking for the presence of surfactant in amniotic fluid. **NEET-PG High-Yield Pearls:** * **Vasa Previa Triad:** Rupture of membranes + Painless vaginal bleeding + Fetal bradycardia. The Apt test is the diagnostic tool of choice here. * **Apt Test Result:** Pink = Fetal blood; Yellow/Brown = Maternal blood. * **Limitation:** The Apt test cannot be used if the blood sample is already clotted or if the fetal blood is contaminated with maternal gastric juice (which denatures HbF).

Question 565: Which of the following is included in the third step of management of atonic uterus?

A. IV Calcium Gluconate
B. Uterine Massage and bimanual compression (Correct Answer)
C. Balloon tamponade
D. Per rectal PGE1

Explanation: **Explanation:** The management of **Atonic Postpartum Hemorrhage (PPH)** follows a structured, step-wise protocol aimed at achieving uterine contraction and preventing hypovolemic shock. **1. Why Option B is Correct:** According to the standard WHO and FIGO guidelines, the management of atonic PPH follows these steps: * **Step 1:** Call for help and assess ABC (Airway, Breathing, Circulation). * **Step 2:** Uterotonic administration (Inj. Oxytocin 10-20 units IV/IM). * **Step 3:** **Uterine Massage and Bimanual Compression.** This mechanical stimulation helps the uterus contract and "kink" the spiral arteries, providing immediate hemostasis while waiting for pharmacological agents to take effect. **2. Analysis of Incorrect Options:** * **Option A (IV Calcium Gluconate):** While calcium is essential for muscle contraction and coagulation, it is not a primary step in the PPH algorithm. It is usually reserved for cases of massive transfusion to prevent citrate toxicity. * **Option C (Balloon Tamponade):** This is a **Step 4** intervention (Surgical/Mechanical management). If medical management and bimanual compression fail, intrauterine balloon tamponade (e.g., Bakri balloon) is the next step before proceeding to surgical devascularization. * **Option D (Per rectal PGE1):** Misoprostol (PGE1) is a uterotonic used in **Step 2** (Pharmacological management), often alongside or after Oxytocin. **Clinical Pearls for NEET-PG:** * **Most common cause of PPH:** Uterine Atony (70-80%). * **Drug of Choice for Prophylaxis (AMTSL):** Inj. Oxytocin 10 IU IM. * **Contraindication for Carboprost (PGF2α):** Bronchial Asthma. * **Contraindication for Methylergometrine:** Hypertension and Heart Disease. * **Surgical Sequence:** Uterine Artery Ligation $\rightarrow$ Internal Iliac Artery Ligation $\rightarrow$ Hysterectomy (Last resort).

Question 566: True about abruptio placentae, all are correct except?

A. Hypertension in pregnancy is an important predisposing factor.
B. Placenta lying in the lower segment. (Correct Answer)
C. Tender and hard uterus.
D. Continuous bleeding per vaginum.

Explanation: **Explanation:** Abruptio placentae is defined as the premature separation of a **normally situated placenta** from the uterine wall before the birth of the fetus. **Why Option B is the Correct Answer (The Exception):** The hallmark of abruptio placentae is that the placenta is located in the **upper uterine segment**. If the placenta is implanted in the **lower uterine segment**, the condition is termed **Placenta Previa**. Therefore, Option B is factually incorrect regarding abruption and is the correct choice for this "except" question. **Analysis of Other Options:** * **Option A:** Chronic hypertension and Preeclampsia are the most significant predisposing risk factors for abruption due to maternal vascular degenerative changes. * **Option C:** In abruption, blood often extravasates into the myometrium (Couvelaire uterus), leading to uterine irritability. This manifests clinically as a **woody-hard, board-like, and tender uterus**. * **Option D:** Unlike the episodic, painless bleeding of placenta previa, the bleeding in abruption is typically **continuous** and associated with abdominal pain. **NEET-PG High-Yield Pearls:** * **Most common cause of DIC in obstetrics:** Abruptio Placentae. * **Couvelaire Uterus:** Utero-placental apoplexy where blood seeps into the myometrium (diagnosed via laparotomy). * **Classification:** Revealed (blood escapes), Concealed (blood trapped behind placenta), and Mixed (most common). * **Key Clinical Triad:** Abdominal pain, uterine tenderness, and vaginal bleeding (in revealed/mixed types).

Question 567: A 37-week primigravida presents with uterine contractions for 10 hours. On examination, the cervix is 1 cm dilated and poorly effaced. What is the appropriate management?

A. Cesarean section
B. Amniotomy
C. Oxytocin drip
D. Sedation and await further progress (Correct Answer)

Explanation: ### Explanation The patient is in the **Latent Phase of Labor**. According to Friedman’s criteria and modern labor standards, the latent phase is characterized by regular uterine contractions and cervical effacement, but cervical dilation is **less than 4–6 cm**. **1. Why Option D is Correct:** A primigravida with only 1 cm dilation after 10 hours of contractions is likely experiencing a **Prolonged Latent Phase** (defined as >20 hours in primigravida and >14 hours in multipara). The standard management for a patient in the latent phase who is distressed or exhausted is **therapeutic rest (sedation)**. This allows the patient to rest; subsequently, she will either wake up in active labor, or the contractions will cease (indicating false labor). Active intervention is not indicated until the active phase (≥4–6 cm dilation) is reached. **2. Why Other Options are Incorrect:** * **A. Cesarean Section:** This is an invasive surgical intervention. There is no evidence of fetal distress or cephalopelvic disproportion (CPD) to justify a CS at this stage. * **B. Amniotomy (ARM):** Artificial rupture of membranes is used to augment labor in the *active phase*. Performing it in the latent phase increases the risk of chorioamnionitis and cord prolapse without significantly shortening the duration of labor. * **C. Oxytocin Drip:** While oxytocin can be used for a prolonged latent phase, sedation is generally preferred as the first-line "rest" strategy to avoid unnecessary medicalization and the risk of uterine hyperstimulation. **Clinical Pearls for NEET-PG:** * **Active Phase Start:** Modern guidelines (ACOG/WHO) now suggest the active phase begins at **6 cm** dilation, though many textbooks still use 4 cm. * **Friedman’s Curve:** Remember the "Rule of 20/14"—Prolonged latent phase is >20 hrs (Primi) and >14 hrs (Multi). * **Management Priority:** In the latent phase, "patience is a virtue." Avoid interventions (ARM/Oxytocin) to reduce the incidence of failed induction and unnecessary CS.

Question 568: According to Browne's classification of placenta previa, which type describes the placenta covering the internal os when closed but not when fully dilated?

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

Explanation: ### Explanation **Browne’s Classification** (also known as the Traditional or Stallworthy classification) is a clinical grading system for placenta previa based on the relationship between the placental edge and the internal os. **Why Type 3 is Correct:** In **Type 3 (Incomplete or Partial Central)** placenta previa, the placenta completely covers the internal os when it is closed. However, as labor progresses and the cervix undergoes effacement and dilatation, the placenta only partially covers the opening. This is a critical distinction for NEET-PG, as it differentiates Type 3 from Type 4. **Analysis of Incorrect Options:** * **Type 1 (Low-lying):** The placenta is implanted in the lower uterine segment, but the lower edge does not reach the internal os (it is usually within 2–5 cm of the os). * **Type 2 (Marginal):** The placental edge reaches the margin of the internal os but does not cover it. It is further divided into 2a (Anterior) and 2b (Posterior). * **Type 4 (Total/Complete Central):** The placenta completely covers the internal os even when the cervix is fully dilated. This always necessitates a Cesarean section. **High-Yield Clinical Pearls for NEET-PG:** * **Type 2b (Posterior Marginal)** is known as the **"Dangerous Placenta Previa"** because the placenta can be compressed between the fetal head and the sacral promontory, leading to fetal distress and interfering with head engagement (Stallworthy’s sign). * **Diagnosis:** Transvaginal Ultrasound (TVS) is the gold standard for locating the placenta. * **Management:** For Types 1 and 2a (Anterior), a trial of vaginal delivery may be attempted. For Types 2b, 3, and 4, Cesarean section is the mandatory mode of delivery. * **Mnemonic:** Remember the "Rule of Os"—Type 3 covers the os *only* when closed; Type 4 covers it *always*.

Question 569: Which mode of delivery is associated with the least rate of HIV transmission?

A. Forceps delivery
B. Normal delivery
C. Breast feeding
D. Cesarean section (Correct Answer)

Explanation: **Explanation:** The primary goal in managing a pregnancy complicated by HIV is to minimize **Mother-to-Child Transmission (MTCT)**. Transmission can occur antenatally, intrapartum, or postpartum. **Why Cesarean Section is Correct:** Elective (Planned) Cesarean Section at **38 weeks** (before the onset of labor or rupture of membranes) significantly reduces the risk of vertical transmission. It avoids the neonate’s exposure to infected maternal blood and vaginal secretions in the birth canal. Clinical trials have shown that elective CS can reduce transmission risk by up to 50% compared to vaginal delivery in women not on optimal ART or those with a high viral load (>1,000 copies/mL). **Why Other Options are Incorrect:** * **Normal Delivery:** Associated with a higher risk than elective CS due to prolonged contact with cervicovaginal secretions and the potential for "micro-transfusions" during uterine contractions. * **Forceps Delivery:** Instrumental deliveries (Forceps/Vaccum) are generally **contraindicated** or avoided in HIV-positive patients because they can cause fetal scalp abrasions, creating a portal of entry for the virus and increasing transmission risk. * **Breastfeeding:** This is a major route of **postpartum** transmission. In resource-rich settings, it is contraindicated; in resource-limited settings, exclusive breastfeeding is only advised if the mother is on strict ART. **High-Yield Clinical Pearls for NEET-PG:** * **Viral Load is Key:** If the viral load is **<50 copies/mL** at 36 weeks, a planned vaginal delivery is considered safe. * **Zidovudine (AZT):** Should be administered intravenously during labor/delivery if the viral load is >1,000 copies/mL or unknown. * **Avoid:** Artificial Rupture of Membranes (ARM), fetal scalp electrodes, and episiotomies, as these increase transmission risk. * **Post-exposure prophylaxis:** The neonate should receive Zidovudine for 6 weeks (or dual/triple therapy depending on maternal viral suppression).

Question 570: What is the typical rate of cervical dilatation during the first stage of labor in multigravidae?

A. 0.5 cm/hour
B. 1 cm/hour
C. 1.5 cm/hour (Correct Answer)
D. 2 cm/hour

Explanation: **Explanation:** The rate of cervical dilatation is a critical parameter in monitoring the progress of labor, traditionally assessed using **Friedman’s Curve**. The first stage of labor is divided into the latent phase and the active phase. The active phase begins when the cervix is approximately 4–6 cm dilated and is characterized by a predictable, rapid rate of dilatation. **1. Why 1.5 cm/hour is correct:** In **multigravidae**, the active phase of labor progresses significantly faster than in primigravidae due to reduced soft tissue resistance and prior effacement. According to standard obstetric guidelines (Friedman), the minimum expected rate of cervical dilatation in the active phase for a multiparous woman is **1.5 cm/hour**. **2. Analysis of incorrect options:** * **0.5 cm/hour (Option A):** This is far below the normal threshold and would indicate protracted labor in any patient. * **1 cm/hour (Option B):** This is the minimum expected rate for a **primigravida** (nulliparous woman). * **2 cm/hour (Option D):** While some multiparous women may dilate this fast, it is not the standard "typical minimum" rate used to define normal progress in textbooks. **High-Yield Clinical Pearls for NEET-PG:** * **Friedman’s Criteria:** Active phase starts at 4 cm. Minimum dilatation: Primigravida = 1.2 cm/hr; Multigravida = 1.5 cm/hr. * **WHO Partograph (Updated):** The WHO now suggests a threshold of **1 cm/hr** for both groups to initiate interventions, but for exam purposes, Friedman’s 1.5 cm/hr remains the classic answer for multipara. * **Precipitate Labor:** Defined as total labor lasting less than 3 hours (dilatation rate >5 cm/hr in primigravida or >10 cm/hr in multigravida).

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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