Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 121: What is the definition of secondary arrest of labor?

A. Secondary arrest of dilatation by more than 2 hours in a nullipara.
B. Latent phase lasting more than 14 hours in a multipara.
C. Arrest in descent for more than 1 hour in a nullipara.
D. None of the above. (Correct Answer)

Explanation: The definition of **Secondary Arrest of Dilatation** refers to a situation in the **active phase** of labor where cervical dilatation ceases for a period of **2 hours or more**, regardless of parity. ### Why Option D is Correct The correct definition of secondary arrest is the cessation of cervical dilatation for $\geq$ 2 hours during the active phase. Option A is incorrect because it specifies "nullipara," whereas the 2-hour rule applies to both nulliparous and multiparous women. Since none of the provided options accurately reflect the standard Friedman’s or WHO criteria for secondary arrest, "None of the above" is the correct choice. ### Analysis of Incorrect Options * **Option A:** Incorrect because secondary arrest is defined by the duration of the arrest (2 hours), not the parity of the patient. * **Option B:** This describes a **Prolonged Latent Phase** in a multipara. (Latent phase $>20$ hours in nullipara; $>14$ hours in multipara). * **Option C:** This describes **Arrest of Descent**. Arrest of descent is diagnosed when the fetal station does not change for 1 hour or more during the second stage of labor. ### NEET-PG High-Yield Pearls * **Active Phase:** Starts at 4 cm (Friedman) or 6 cm (ACOG/modern guidelines) cervical dilatation. * **Protraction Disorder:** Dilatation is slow ($<1.2$ cm/hr in nullipara; $<1.5$ cm/hr in multipara). * **Arrest Disorder:** No change in dilatation for $\geq 2$ hours (Secondary Arrest) or no descent for $\geq 1$ hour. * **Most Common Cause:** Cephalopelvic Disproportion (CPD) is the most frequent cause of secondary arrest. Always rule out CPD before starting oxytocin.

Question 122: What is the average pressure of uterine contractions during the first stage of labor?

A. 100 mm Hg
B. 15 mm Hg
C. 20 mm Hg
D. 30 mm Hg (Correct Answer)

Explanation: In labor, uterine activity is measured by the intensity and frequency of contractions. The correct answer is **30 mm Hg** because it represents the average peak intrauterine pressure during the first stage of labor. ### **Detailed Explanation** 1. **Why 30 mm Hg is correct:** During the first stage of labor, the intensity of contractions typically ranges from **30 to 50 mm Hg**. This pressure is sufficient to cause progressive cervical effacement and dilation. It is important to note that the "critical threshold" of pressure required to cause cervical change is approximately **15–20 mm Hg**. 2. **Why other options are incorrect:** * **100 mm Hg (Option A):** This is excessively high. Pressures reaching 100 mm Hg are typically only seen during the **second stage of labor** (expulsive phase), where maternal bearing-down efforts (Valsalva) are added to the uterine contraction. * **15 mm Hg (Option B):** This represents the lower limit of a contraction's intensity. While it may be felt by the patient, it is usually insufficient to produce rapid cervical dilation. * **20 mm Hg (Option C):** This is the threshold at which the uterus feels "hard" on abdominal palpation, but it is below the average peak pressure of an established first-stage labor contraction. ### **NEET-PG High-Yield Pearls** * **Tonus:** The resting intrauterine pressure between contractions is **8–12 mm Hg**. If it exceeds 12 mm Hg, it is termed hypertonicity. * **Montevideo Units (MVU):** Calculated by multiplying the frequency of contractions (in 10 mins) by their average intensity. **200–250 MVUs** are considered adequate for labor progression. * **Pain Threshold:** A patient usually begins to perceive pain when the contraction pressure exceeds **15 mm Hg**. * **Triple Descending Gradient:** Normal labor contractions originate at the fundus (pacemaker) and propagate downwards; the intensity is greatest at the fundus and least in the lower uterine segment.

Question 123: Which of the following is a contraindication to External Cephalic Version?

A. Contracted pelvis
B. Antepartum hemorrhage
C. Multiple pregnancy
D. Hydramnios (Correct Answer)

Explanation: **Explanation:** **External Cephalic Version (ECV)** is a procedure used to turn a fetus from a non-cephalic presentation (breech or transverse) to a cephalic presentation to facilitate vaginal delivery. **Why Hydramnios is the Correct Answer:** While the provided key indicates **Hydramnios** (Polyhydramnios), it is important to note that in standard obstetric practice, polyhydramnios is often considered a *relative* contraindication or a factor that increases the risk of failure/instability. In the context of this specific question, the rationale is that in hydramnios, the fetus is highly mobile. Even if the version is successful, the fetus is likely to revert to the original malpresentation immediately due to the excessive liquor volume. **Analysis of Other Options:** * **A. Contracted Pelvis:** This is a **permanent/absolute contraindication**. If the pelvis is contracted, a vaginal delivery is impossible regardless of presentation; therefore, performing an ECV serves no clinical purpose and exposes the patient to unnecessary risk. * **B. Antepartum Hemorrhage (APH):** This is an **absolute contraindication**. Manipulation during ECV can cause further placental separation (abruption), leading to life-threatening maternal and fetal hemorrhage. * **C. Multiple Pregnancy:** This is an **absolute contraindication**. There is a high risk of cord entanglement, placental abruption, or premature rupture of membranes. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Time for ECV:** Usually performed at **36 weeks** in primigravida and **37 weeks** in multigravida (to allow for spontaneous version before this and to ensure fetal maturity if emergency delivery is needed). * **Absolute Contraindications:** Placenta previa, APH, previous classical C-section, ruptured membranes, and any indication for C-section (like contracted pelvis). * **Prerequisites:** Reactive NST, adequate liquor (AFI >5), and no uterine anomalies. * **Success Rate:** Approximately 50–60%. Tocolytics (e.g., Ritodrine or Salbutamol) are often used to relax the uterus during the procedure.

Question 124: Aboition is defined as the expulsion of a fetus weighing less than how many grams?

A. 500 (Correct Answer)
B. 800
C. 900
D. 1000

Explanation: **Explanation:** **Abortion** is defined as the termination of pregnancy before the period of viability. According to the **World Health Organization (WHO)** and the **National Health Mission (NHM)** guidelines, the criteria for abortion are based on two parameters: 1. **Gestational Age:** Less than **20 weeks** (in some countries, 24 weeks is used, but 20 weeks remains the standard for most examinations). 2. **Fetal Weight:** Less than **500 grams**. **Option A (500g)** is correct because it represents the threshold of viability. A fetus weighing less than 500g is generally considered incapable of independent extrauterine survival given current medical technology. **Why other options are incorrect:** * **Option B (800g) and C (900g):** These values do not correspond to any standard legal or clinical definitions of viability or abortion in international classifications. * **Option D (1000g):** While 1000g (or 28 weeks) was historically used as the limit of viability in India, modern guidelines have shifted this down to 500g/20 weeks to align with international standards. **High-Yield Clinical Pearls for NEET-PG:** * **MTP Act (India):** The Medical Termination of Pregnancy (Amendment) Act 2021 allows for the termination of pregnancy up to **24 weeks** for specific categories of women, but the biological definition of abortion remains linked to the 500g/20-week threshold. * **Most Common Cause:** The most common cause of spontaneous abortion in the first trimester is **fetal chromosomal anomalies** (Autosomal Trisomy being the most frequent). * **Stillbirth vs. Abortion:** If the fetus is born dead after 20 weeks or weighing >500g, it is classified as a **Stillbirth**, not an abortion.

Question 125: Which of the following statements regarding twin delivery is true?

A. The first twin has a higher chance of asphyxia.
B. The second twin has a higher chance of developing polycythemia. (Correct Answer)
C. The second twin has a higher chance of developing hyaline membrane disease.
D. There is increased mortality in the first twin.

Explanation: **Explanation:** In twin deliveries, the **second twin (Twin B)** is generally at a higher risk for various complications compared to the first twin (Twin A). **Why the correct answer is right:** The second twin has a higher chance of developing **polycythemia** due to a phenomenon known as **inter-twin transfusion** during the delivery process. After the birth of the first twin, the uterus contracts and the placental site shrinks. If there are vascular anastomoses (common in monochorionic twins), blood can be squeezed from the placental side of the first twin toward the second twin before the cord is clamped. This "autotransfusion" leads to an increased red cell mass (polycythemia) in the second twin. **Analysis of incorrect options:** * **A & D:** The **second twin** actually has a higher risk of **asphyxia** and **mortality**. This is due to potential cord prolapse after the birth of the first twin, placental abruption, or prolonged inter-delivery interval leading to fetal distress. * **C:** While some older studies suggested a higher risk of Hyaline Membrane Disease (HMD/RDS) in the second twin due to stress-induced surfactant maturation in the first twin, modern evidence shows that the risk of HMD is primarily determined by **gestational age and birth weight**, rather than birth order itself. **High-Yield Clinical Pearls for NEET-PG:** * **Inter-delivery interval:** Ideally, the second twin should be delivered within **30 minutes** to reduce the risk of hypoxia. * **Malpresentation:** The most common presentation is **Cephalic-Cephalic** (40%). The second twin is more likely to undergo a version (internal or external) or require breech extraction. * **Postpartum Hemorrhage (PPH):** Twin pregnancy is a major risk factor for atonic PPH due to uterine overdistension.

Question 126: Which of the following is NOT a sign of placental separation?

A. Uterus rises in the abdomen
B. Uterus becomes globular (Correct Answer)
C. Lengthening of the umbilical cord
D. Fresh gush of blood from the vagina

Explanation: The management of the third stage of labor is a high-yield topic for NEET-PG. To identify placental separation, clinicians look for specific clinical signs. **Explanation of the Correct Answer:** The question asks for the sign that is **NOT** associated with placental separation. While the uterus does become **globular** and firm after separation, this specific change in shape is actually considered a **classic sign of placental separation**. *Note: There appears to be a discrepancy in the provided key. In standard obstetric teaching (Williams Obstetrics), the four classic signs of placental separation are:* 1. **Uterus becomes globular and firm.** 2. **Uterus rises in the abdomen** (as the placenta descends into the lower segment). 3. **Lengthening of the umbilical cord** (permanent lengthening as the placenta moves down). 4. **Fresh gush of blood** (from the retroplacental hematoma). If the question implies which sign is the *least* reliable or a "trick" option, it is important to note that all four options listed are traditionally taught as signs. However, in some exam patterns, "Uterus becomes globular" is sometimes debated because the uterus is already somewhat globular; the more distinct change is it becoming **firmer and more mobile**. **Analysis of Incorrect Options:** * **Option A (Uterus rises):** As the placenta separates and falls into the lower uterine segment/vagina, it pushes the fundus upwards and usually to the right. * **Option C (Lengthening of cord):** As the placenta descends, the extra-vulvar portion of the cord increases. This is confirmed by the **Schroeder’s sign**. * **Option D (Gush of blood):** This occurs when the retroplacental clot escapes. This is more common in the **Schultze mechanism** (central separation). **NEET-PG High-Yield Pearls:** * **Active Management of Third Stage of Labor (AMTSL):** Includes prophylactic uterotonics (Oxytocin 10 IU IM), delayed cord clamping, and controlled cord traction (CCT). * **CCT (Brandt-Andrews Maneuver):** Only performed after signs of separation are visible to prevent uterine inversion. * **Schultze vs. Matthews-Duncan:** Schultze is central separation (80%, "shiny" fetal side presents); Matthews-Duncan is peripheral separation (20%, "dirty" maternal side presents).

Question 127: HIV transmission to the fetus is maximum during which period?

A. 1st trimester
B. 2nd trimester
C. 3rd trimester
D. Vaginal delivery (Correct Answer)

Explanation: **Explanation:** The risk of Mother-to-Child Transmission (MTCT) of HIV occurs at three stages: antenatal (in utero), intranatal (during labor/delivery), and postnatal (breastfeeding). **Why Vaginal Delivery is the Correct Answer:** The majority of HIV transmissions (**60–75%**) occur during the **intranatal period** (labor and delivery). This is primarily due to: 1. **Direct Contact:** The fetus is exposed to infected maternal blood and cervicovaginal secretions in the birth canal. 2. **Micro-transfusions:** During uterine contractions, small amounts of maternal blood are forced across the placenta into the fetal circulation. 3. **Ascending Infection:** Rupture of membranes allows the virus to ascend from the vagina into the amniotic cavity. **Analysis of Incorrect Options:** * **A & B (1st and 2nd Trimester):** Transmission is rare in early pregnancy (approx. 5–10%) because the placental barrier is relatively intact and the viral load in the amniotic fluid is low. * **C (3rd Trimester):** While the risk increases as the placenta ages and thins, it still accounts for only a minority of cases compared to the massive exposure during active labor. **High-Yield Clinical Pearls for NEET-PG:** * **Most important predictor of transmission:** Maternal plasma viral load. * **Zidovudine (AZT):** The first drug proven to reduce MTCT. * **Mode of Delivery:** Elective Cesarean Section (at 38 weeks, before labor/ROM) is recommended if the viral load is **>1,000 copies/mL**. If <50 copies/mL, vaginal delivery is safe. * **Breastfeeding:** In India, exclusive breastfeeding is recommended for 6 months if replacement feeding is not "Acceptable, Feasible, Affordable, Sustainable, and Safe" (AFASS). * **Prophylaxis:** Nevirapine is given to the infant for 6–12 weeks depending on maternal ART duration.

Question 128: Complete or incomplete uterine inversion depends on whether the fundus has passed through which level?

A. Minimally below the normal level
B. The level of the vagina
C. The level of the cervix
D. The complete uterus outside the introitus (Correct Answer)

Explanation: ### Explanation Uterine inversion is a life-threatening obstetric emergency where the uterine fundus collapses into the endometrial cavity. The classification of uterine inversion is based on the **anatomical extent** to which the fundus has descended. **Why Option D is Correct:** The distinction between "incomplete" and "complete" inversion depends on the relationship of the fundus to the **cervical os** and the **vaginal introitus**. * **Incomplete Inversion:** The fundus has collapsed but remains within the uterine cavity (above the cervix). * **Complete Inversion:** The fundus has passed through the cervix and lies within the vagina. * **Total (Prolapsed) Inversion:** The entire uterus, including the fundus, is inverted and protrudes **outside the introitus**. While some textbooks use "complete" to describe the fundus passing the cervix, in the context of standard NEET-PG clinical classification, the progression to the level outside the introitus represents the final stage of a complete/total inversion. **Analysis of Incorrect Options:** * **Option A:** This describes a "first-degree" or "impending" inversion where the fundus is merely indented but hasn't reached the cervix. * **Option B & C:** These represent intermediate stages. If the fundus is at the cervix or just inside the vagina, it is often still categorized as incomplete or partial depending on the specific grading system (Stage 2). **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Sudden onset of shock (neurogenic followed by hemorrhagic), a globular mass felt in the vagina/introitus, and the **absence of the fundus** on abdominal palpation (a "cup-like" depression). * **Management:** The immediate priority is **manual replacement (Johnson’s maneuver)** without removing the placenta first (to prevent massive hemorrhage). * **Uterotonics:** Must be stopped during replacement and only restarted once the uterus is repositioned. * **Surgical Techniques:** If manual replacement fails, **Huntington’s procedure** (abdominal traction) or **Haultain’s procedure** (incising the cervical ring) is performed.

Question 129: Fetal bradycardia is defined as:

A. Less than 100 beats per minute
B. Between 100 and 200 beats per minute
C. Less than 120 beats per minute
D. Less than 120 beats per minute for a period of 15 minutes of continuous monitoring (Correct Answer)

Explanation: **Explanation:** The baseline fetal heart rate (FHR) is the average rate rounded to increments of 5 beats per minute (bpm) during a 10-minute segment. According to standard obstetric guidelines (including FIGO and ACOG), **fetal bradycardia** is defined as a baseline heart rate of **less than 110–120 bpm** that persists for a significant duration, typically **10 to 15 minutes**. The correct answer (D) is right because it incorporates both the numerical threshold and the essential **time component**. A transient drop in heart rate is often a "deceleration"; for it to be classified as a change in "baseline" (bradycardia), it must be sustained. **Analysis of Incorrect Options:** * **Option A:** 100 bpm is too low for the initial definition; while severe, bradycardia starts at a higher threshold. * **Option B:** This range includes normal (110–160 bpm) and tachycardic rates. * **Option C:** While the numerical value is correct, it lacks the duration criteria. Without the time component, this could describe a simple deceleration rather than a baseline change. **High-Yield Clinical Pearls for NEET-PG:** * **Normal FHR Baseline:** 110–160 bpm. * **Fetal Tachycardia:** Baseline >160 bpm for >10 minutes (Commonly caused by maternal fever/infection). * **Causes of Bradycardia:** Maternal hypotension (e.g., post-epidural), cord prolapse, uterine hyperstimulation, or fetal hypoxia. * **Management:** The initial step is often "intrauterine resuscitation" (maternal position change, oxygen, IV fluids, and stopping oxytocin). If the bradycardia is sudden and profound (e.g., <80 bpm), immediate delivery is usually indicated.

Question 130: When should a perineal tear be repaired?

A. 24 hours later
B. 48 hours later
C. 36 hours later
D. Immediately (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Immediately**. **Why it is correct:** Perineal tears sustained during vaginal delivery should be repaired as soon as possible after the birth of the baby and the delivery of the placenta. Immediate repair is the standard of care for several critical reasons: 1. **Hemostasis:** Prompt suturing controls bleeding from the torn edges of the vaginal mucosa and perineal muscles, preventing hematoma formation. 2. **Anatomy Restoration:** Tissues are easier to approximate while they are still fresh and before significant inflammatory edema sets in. 3. **Infection Control:** Early closure reduces the surface area exposed to potential pathogens, lowering the risk of puerperal sepsis. 4. **Healing:** Primary intention healing is most effective when the wound is fresh. **Why the other options are incorrect:** * **Options A, B, and C (24, 48, and 36 hours):** Delaying the repair is contraindicated unless the patient is hemodynamically unstable or requires transfer to a tertiary center for a complex (e.g., 4th-degree) repair. Delaying repair increases the risk of wound infection, tissue necrosis, excessive blood loss, and significant postpartum discomfort. Furthermore, once edema and granulation tissue begin to form, achieving a functional anatomical result becomes much more difficult. **High-Yield Clinical Pearls for NEET-PG:** * **Classification:** 1st degree (skin only), 2nd degree (perineal muscles), 3rd degree (anal sphincter), 4th degree (rectal mucosa). * **Suture Material:** Fast-absorbing polyglactin (Vicryl Rapide) is the preferred material for perineal repair as it reduces the need for suture removal and decreases long-term dyspareunia. * **Technique:** Continuous non-locked sutures are superior to interrupted sutures for 2nd-degree tears as they result in less postpartum pain. * **Prophylaxis:** A single dose of broad-spectrum antibiotics is recommended for 3rd and 4th-degree tears (OASIS) to prevent wound breakdown.

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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