Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 1071: Duration of second stage of labor (propulsive stage) in multipara

A. Approximately 20 minutes (Correct Answer)
B. 40 minutes
C. 1 hour
D. 10 minutes

Explanation: ***Approximately 20 minutes*** - In **multiparas**, the second stage of labor, also known as the **propulsive stage**, is typically shorter due to prior experience with childbirth. - While there is variability, an average duration of **20 minutes** for this stage is commonly observed in multiparous women. *40 minutes* - A duration of 40 minutes for the propulsive stage would be considered on the longer side for a **multipara**, often approaching the upper limits of normal. - While not necessarily abnormal, it is longer than the **average expected time** for multiparous women. *1 hour* - A second stage duration of **1 hour** in a multipara would generally be considered prolonged and might warrant intervention or closer monitoring. - This duration is more consistent with the **upper limit of normal** in nulliparous women or cases of arrest of labor in multiparas. *10 minutes* - While some multiparous women may have a very rapid second stage, **10 minutes** is on the shorter end of the average. - This could indicate a **precipitous labor**, which can carry its own risks such as maternal lacerations and neonatal complications.

Question 1072: Contracted pelvis is defined as a condition where the dimensions of the pelvis are reduced, making childbirth difficult. What is the minimum shortening of one or more planes that is considered significant?

A. 1.5 cm (Correct Answer)
B. 0.5 cm
C. 1.25 cm
D. 1 cm

Explanation: ***1.5 cm*** - A reduction of **1.5 cm or more** in any of the pelvic planes is widely accepted as **clinically significant** to define a contracted pelvis. - Most standard obstetric textbooks (including Williams Obstetrics and DC Dutta) cite **1.5-2 cm** as the threshold for clinically significant pelvic contraction. - This degree of shortening can impede the normal mechanism of labor and increase the risk of **cephalopelvic disproportion**. *1 cm* - While some older references mention 1 cm, the **generally accepted minimum threshold** in modern obstetric practice is **1.5-2 cm**. - A reduction of only 1 cm may not consistently cause significant obstetric complications and falls within the range of normal variation in many cases. *1.25 cm* - This value is **below the standard threshold** of 1.5-2 cm used to define a contracted pelvis in most authoritative obstetric texts. - While it represents some reduction, it does not meet the minimum accepted criterion for clinical significance. *0.5 cm* - A shortening of **0.5 cm** is **insufficient** to classify a pelvis as contracted. - Minor variations within this range fall within the **normal spectrum** and do not typically cause labor complications.

Question 1073: Following delivery, a tear involving the perineum and external anal sphincter with intact mucosa is classified as which grade?

A. First degree
B. Second degree
C. Third degree (Correct Answer)
D. Fourth degree

Explanation: ***Third degree*** - A third-degree perineal tear involves the **perineum** and the **external anal sphincter (EAS)**, either partially or completely, while the **anal mucosa remains intact**. - This classification is crucial for determining the necessary repair technique and predicting potential long-term complications related to **anal incontinence**. *First degree* - A first-degree tear involves only the **skin** of the perineum and the **vaginal mucosa**, without involving the underlying muscle. - These tears are typically superficial and may not even require suturing. *Second degree* - A second-degree tear involves the **perineal muscles** but does not extend to the anal sphincter. - It includes the vaginal mucosa, perineal skin, and muscles but spares the **external anal sphincter**. *Fourth degree* - A fourth-degree tear is the most severe, involving the **perineum**, **external anal sphincter**, and extending through the **anal mucosa**, exposing the rectal lumen. - These tears carry the highest risk of **fecal incontinence** and require meticulous surgical repair.

Question 1074: Lovset manoeuvre is used in delivery of:

A. Arms (Correct Answer)
B. Head
C. Breech
D. Foot

Explanation: ***Arms*** - The Lovset manoeuvre is specifically designed to facilitate the delivery of the **shoulders and arms** in a **breech presentation** when they are extended upwards. - This technique involves rotating the fetal trunk to bring the anterior shoulder under the pubic symphysis, allowing for the gentle extraction of the posterior arm first, followed by the anterior arm. *Head* - Delivery of the head in a breech presentation is typically managed using **Mauriceau-Smellie-Veit manoeuvre** or Piper forceps, not the Lovset manoeuvre. - The Lovset manoeuvre aims to address difficult arm delivery prior to head delivery. *Breech* - While the Lovset manoeuvre is used *during* a breech delivery, it specifically addresses **arm extraction**, not the overall delivery of the entire breech presentation. - The term "breech" refers to the fetal presentation where the buttocks or feet are presented first. *Foot* - If a foot is presenting first, it is usually a **footling breech presentation**, and the delivery of the foot itself does not typically require the Lovset manoeuvre. - The Lovset manoeuvre is reserved for extended arms, which are distinct from the initial presentation of a foot.

Question 1075: Which of the following conditions can lead to a prolonged second stage of labor?

A. Cephalopelvic disproportion
B. All of the options (Correct Answer)
C. Uterine inertia
D. Maternal exhaustion

Explanation: ***All of the options*** - **Uterine inertia**, **maternal exhaustion**, and **cephalopelvic disproportion** are all well-established causes of a prolonged second stage of labor. - These factors either impede effective uterine contractions, reduce the mother's ability to push, or create a physical barrier to fetal descent, respectively. *Uterine inertia* - Refers to **weak** or **ineffective uterine contractions** that are insufficient to expel the fetus. - This directly prolongs the second stage by failing to provide adequate propulsive force. *Maternal exhaustion* - Occurs when the mother becomes too **tired** to effectively push, often due to a long and difficult labor. - Reduced maternal effort leads to a lack of downward pressure, extending the second stage. *Cephalopelvic disproportion* - Characterized by a mismatch between the **size of the fetal head** and the **maternal pelvis**, preventing the head from descending. - This mechanical obstruction inevitably leads to a prolonged, and often ultimately arrested, second stage of labor.

Question 1076: Which of the following methods is not used for managing shoulder dystocia?

A. Zavanelli maneuver
B. Wood's maneuver
C. Hegar's maneuver (Correct Answer)
D. McRobert's maneuver

Explanation: *McRobert's maneuver* - This maneuver is a common first-line intervention for shoulder dystocia, involving sharp **flexion of the mother's hips** back towards her abdomen to flatten the sacrum and rotate the symphysis pubis anteriorly. - It works by increasing the functional diameter of the **pelvic outlet**, potentially dislodging the anterior shoulder. ***Hegar's maneuver*** - **Hegar's sign** is a clinical finding related to early pregnancy, indicating the **softening of the lower uterine segment** (isthmus) upon bimanual examination. - It is a diagnostic sign of pregnancy and **not a method used to resolve shoulder dystocia**. *Zavanelli maneuver* - The **Zavanelli maneuver** is a last-resort intervention for shoulder dystocia, involving the **replacement of the fetal head into the uterus** followed by immediate delivery via **cesarean section**. - This is a highly invasive procedure with significant risks to both mother and fetus, used when other maneuvers have failed. *Wood's maneuver* - **Wood's maneuver** involves **rotating the fetal shoulders** by applying pressure to the posterior aspect of the anterior shoulder or the anterior aspect of the posterior shoulder to achieve a corkscrew effect. - This rotation can help dislodge an impacted shoulder or facilitate its passage under the symphysis pubis.

Question 1077: Which drug is contraindicated before delivery of the baby (during first and second stages of labor)?

A. Mifepristone
B. Oxytocin
C. Misoprostol
D. Ergometrine (Correct Answer)

Explanation: ***Ergometrine*** - **Ergometrine** is a potent uterotonic agent that causes **tetanic (sustained) uterine contractions**. - It is **absolutely contraindicated before delivery of the baby** (during first and second stages of labor) because: - Sustained contractions lead to **fetal hypoxia** and **fetal distress** by reducing placental blood flow - Risk of **uterine rupture** due to excessive uterine tone - **Obstructed labor** and **cervical lacerations** from forcing delivery against sustained contraction - Ergometrine is **only used after delivery of the baby** in the third stage for active management and prevention of postpartum hemorrhage. *Mifepristone* - **Mifepristone** is an antiprogesterone used for medical abortion in early pregnancy or cervical ripening before labor induction. - It is not relevant during active labor as it acts by blocking progesterone receptors, not by causing immediate uterine contractions. *Oxytocin* - **Oxytocin** is the drug of choice for induction and augmentation of labor. - It causes **rhythmic, intermittent contractions** that allow for adequate placental perfusion between contractions. - Safe to use during first and second stages when properly monitored. *Misoprostol* - **Misoprostol** is a prostaglandin E1 analog used for cervical ripening and labor induction. - Can be used before and during labor for induction, though requires careful monitoring. - Unlike ergometrine, it does not cause sustained tetanic contractions when used in appropriate doses.

Question 1078: Which of the following actions should be avoided during the delivery of an Rh-negative mother?

A. Gently perform manual removal of placenta if necessary (Correct Answer)
B. Withhold ergometrine until after anterior shoulder delivery
C. Administer IV fluids
D. Apply fundal pressure during second stage of labor

Explanation: ***Gently perform manual removal of placenta if necessary*** - **Manual removal of the placenta** can significantly increase the risk of **fetomaternal hemorrhage**, which is particularly dangerous in an **Rh-negative mother**. Large amounts of fetal blood entering the maternal circulation can lead to significant alloimmunization, making subsequent pregnancies high-risk. - This procedure should be **avoided if possible** due to the heightened risk of sensitizing the mother to Rh antigens; if it is absolutely necessary, a **higher dose of Rh immunoglobulin** may be required. *Withhold ergometrine until after anterior shoulder delivery* - **Ergometrine** is a uterotonic agent used to prevent **postpartum hemorrhage**. Withholding it until after the birth of the anterior shoulder is a **standard practice** to prevent uterine tetany before the baby is fully delivered. - This action does not pose a specific risk to an **Rh-negative mother** related to Rh sensitization; it is a general obstetric safety measure to ensure safe delivery and should **not be avoided**. *Apply fundal pressure during second stage of labor* - **Fundal pressure** (applying pressure to the top of the uterus to expedite delivery) is a **controversial practice** that is generally discouraged due to potential maternal and fetal complications. - While it may theoretically carry a small risk of **fetomaternal hemorrhage**, it is not specifically contraindicated in Rh-negative mothers more than in others. The main concerns are **uterine rupture**, **maternal injury**, and **fetal trauma**. If appropriate precautions with **Rh immunoglobulin** are taken, Rh status alone is not a reason to avoid this practice (though it should generally be avoided for other safety reasons). *Administer IV fluids* - **Intravenous fluids** are commonly administered during labor and delivery to maintain **hydration**, support **blood pressure**, and provide a route for medications. This is a **routine and safe practice**. - Administering IV fluids has no direct impact on **Rh sensitization** and is not contraindicated in an **Rh-negative mother**.

Question 1079: Which drug is associated with decreased fetal heart rate during labor?

A. Oxytocin (Correct Answer)
B. Sodium bicarbonate
C. IV fluids
D. Iron

Explanation: ***Oxytocin*** - **Oxytocin** stimulates uterine contractions, which can reduce blood flow to the placenta and temporarily decrease **fetal oxygenation**, leading to **fetal heart rate decelerations**. - Overstimulation of the uterus by oxytocin can result in **tachysystole** (>5 contractions in 10 minutes), potentially causing **fetal hypoxia** and associated changes in fetal heart rate patterns such as late decelerations or bradycardia. *Sodium bicarbonate* - **Sodium bicarbonate** is used to correct metabolic acidosis, but it does not directly affect **fetal heart rate** or uterine activity in a way that causes decelerations. - Its administration is unlikely to impact fetal heart rate unless the underlying condition causing acidosis also affects fetal well-being, which is not a direct drug effect. *IV fluids* - **Intravenous fluids** are often administered during labor to maintain hydration and support maternal circulation, which generally helps improve **fetal well-being** and maintain normal fetal heart rate patterns. - They can help optimize **uterine perfusion**, thereby improving oxygen delivery to the fetus and reducing the risk of fetal distress. *Iron* - **Iron** is essential for red blood cell production and preventing maternal anemia; it has no direct or acute effect on **fetal heart rate** during labor. - Administered as a supplement, iron is not a medication used during labor to impact **uterine contractility** or fetal heart rate in the way oxytocin does.

Question 1080: In which obstetric condition is assisted head delivery typically performed?

A. Shoulder dystocia
B. Breech presentation (Correct Answer)
C. Transverse lie
D. Normal delivery

Explanation: ***Breech presentation*** - In a **breech presentation**, the baby's buttocks or feet are delivered first, necessitating assisted head delivery to prevent **head entrapment** in the maternal pelvis, which can lead to fetal hypoxia or trauma. - Techniques like the **Mauriceau-Smellie-Veit maneuver** are employed to carefully deliver the fetal head after the body. *Shoulder dystocia* - This condition involves the impaction of the fetal shoulder against the maternal symphysis pubis after the head has been delivered. - The focus of management is on delivering the shoulders, not the head, through maneuvers such as the **McRoberts maneuver** or **suprapubic pressure**. *Transverse lie* - A **transverse lie** means the baby is positioned horizontally across the uterus, preventing vaginal delivery without intervention (e.g., external cephalic version or C-section). - This position requires repositioning or surgical delivery of the entire fetus, and assisted head delivery is not the primary concern. *Normal delivery* - In a **normal (vertex) delivery**, the fetal head presents first and typically delivers spontaneously with minimal assistance. - The head usually flexes and rotates to navigate the birth canal on its own, so specific assisted head delivery techniques are not typically required.

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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