Labor and Delivery — MCQs

A 30-year-old G2P1 is undergoing an elective repeat caesarean section at term. The infant is delivered without any difficulties, but the placenta cannot be removed easily because a clear plane between the placenta and uterine wall cannot be identified. The placenta is removed in pieces. This is followed by uterine atony and haemorrhage. All of the following are true regarding the condition except:

Q978

To obtain true conjugate, the following factor should be subtracted from the diagonal conjugate:

Q979

Pressure in ventouse assisted delivery is:

Q980

An elderly multigravida female presents in labor. She has multiple fibroids in the lower uterine segment. Management is:

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 971: Postpartum VVF is best repaired after:

A. 6 months
B. 6 weeks
C. 8 weeks
D. 3 months (Correct Answer)

Explanation: ***3 months*** - Waiting at least **3 months** for VVF repair allows for complete resolution of **acute inflammation**, **edema**, and infection in surrounding tissues. - This waiting period helps tissues to **regain their normal vascularity** and pliancy, which is crucial for a successful surgical outcome and reduced risk of recurrence. *6 months* - While waiting longer may seem safer, 6 months is generally **unnecessarily long** for most postpartum VVF repairs. - Prolonged waiting can lead to **increased psychological distress** for the patient due to persistent leakage and discomfort. *6 weeks* - Repairing a VVF at 6 weeks postpartum is generally **too early** as the tissues are still highly friable and inflamed. - This early intervention significantly **increases the risk of dehiscence** and failure of the repair due to poor tissue healing. *8 weeks* - Similar to 6 weeks, 8 weeks postpartum is usually **insufficient time** for complete resolution of acute inflammation and edema. - Operating at this stage can still lead to **poor tissue integrity** and a higher chance of a failed repair.

Question 972: A forceps rotation of 30 degrees from left occiput anterior (LOA) to occiput anterior (OA) with extraction of the fetus from +2 station is described as which type of forceps delivery?

A. Mid forceps
B. Outlet forceps
C. High forceps
D. Low forceps (Correct Answer)

Explanation: ***Low forceps*** - A **low forceps delivery** is defined when the leading point of the fetal skull is at station **≥+2 cm** (at or below +2 station) but **not on the pelvic floor**. - The rotation must be **≤45 degrees** for standard low forceps. - In this scenario, the fetal head is at **+2 station** with a **30-degree rotation** from LOA to OA, which fits the criteria for low forceps delivery. *Mid forceps* - **Mid forceps deliveries** are performed when the fetal head is **engaged** but the station is **between 0 and +2 cm** (above +2 station). - Since this scenario describes a head **at +2 station**, it is too low to be classified as mid forceps. *Outlet forceps* - **Outlet forceps** requires: (1) scalp visible at the introitus **without separating the labia**, (2) fetal skull on the **pelvic floor**, and (3) sagittal suture in AP diameter or ROA/LOA/ROP/LOP position with rotation **≤45 degrees**. - Although the 30-degree rotation meets the rotation criterion, at **+2 station** the fetal head is typically **not yet on the pelvic floor** with the scalp visible at the introitus without separating the labia, which are required for outlet forceps classification. *High forceps* - **High forceps** involves application of forceps **before engagement** of the fetal head. - This procedure is **obsolete** and not performed in modern obstetrics. - At **+2 station**, the head is clearly engaged and descended, so this classification does not apply.

Question 973: Incidence of scar rupture in previous lower segment caesarean section:

A. 5%
B. 7%
C. 6%
D. 1% (Correct Answer)

Explanation: ***1%*** - The incidence of **uterine rupture** in a subsequent pregnancy after a **low transverse uterine incision** (previous lower segment caesarean section) is approximately **0.5-1%**. This low risk allows for considering a trial of labor after cesarean (TOLAC) in appropriate candidates. - This value represents the general risk and is a critical factor in counseling patients about the safety of **vaginal birth after cesarean (VBAC)**. *5%* - An incidence of **5%** for scar rupture is significantly higher than what is observed for a **lower segment caesarean section**. - This higher percentage might be associated with a **classical uterine incision** (vertical incision in the upper uterine segment) which carries a much greater risk of uterine rupture. *7%* - A **7%** incidence of scar rupture is also substantially higher than the typical risk associated with a previous **lower segment caesarean section**. - This rate would generally be considered prohibitive for most cases of **TOLAC** due to the increased maternal and fetal risks. *6%* - An incidence of **6%** for scar rupture is not consistent with the known rates for a **lower segment caesarean section**. - This figure indicates a risk much higher than the actual average and would likely lead to recommendations against **TOLAC**.

Question 974: The shortest anteroposterior diameter of the pelvic inlet is:

A. All are equal
B. Obstetric conjugate (Correct Answer)
C. True conjugate
D. Diagonal conjugate

Explanation: ***Obstetric conjugate*** - The **obstetric conjugate** is the shortest anteroposterior diameter of the pelvic inlet, measured from the posterior superior aspect of the pubic symphysis to the sacral promontory. - This is the **narrowest available anteroposterior diameter** through which the fetal head must pass during labor, making it clinically significant. *All are equal* - This statement is incorrect as the various pelvic conjugate measurements have **distinct lengths** and clinical implications. - The different conjugated diameters are measured between specific anatomical points and are not uniform. *True conjugate* - The **true conjugate** (anatomical conjugate) extends from the middle of the sacral promontory to the superior posterior margin of the pubic symphysis. - While it is a key pelvic inlet measurement, it is slightly longer than the obstetric conjugate because it measures to the *superior* rather than the *posterior superior* aspect of the symphysis, which has a small posterior projection. *Diagonal conjugate* - The **diagonal conjugate** is measured clinically via vaginal examination from the inferior border of the pubic symphysis to the sacral promontory. - This measurement is typically about **1.5-2 cm longer** than the true conjugate and is an indirect estimate of the obstetric conjugate.

Question 975: Which of the following is FALSE regarding the diameters of the normal female pelvis?

A. Oblique diameter is the largest diameter of inlet
B. Obstetric conjugate is calculated by adding 1.5 cm to diagonal conjugate (Correct Answer)
C. Obstetric conjugate indicates status of mid pelvis
D. AP Diameter is the shortest diameter at brim

Explanation: ***Obstetric conjugate is calculated by adding 1.5 cm to diagonal conjugate*** - The **obstetric conjugate** is actually calculated by **subtracting 1.5 to 2 cm from the diagonal conjugate**, not adding, to estimate the shortest distance between the sacral promontory and the symphysis pubis. - This measurement is crucial as it represents the narrowest anteroposterior diameter through which the fetal head must pass during labor, making the incorrect calculation statement false. *Oblique diameter is the largest diameter of inlet* - The **transverse diameter** is generally considered the **largest diameter of the pelvic inlet** (around 13 cm), extending across the widest part of the pelvic brim. - While the **oblique diameter** is significant (around 12.5 cm), it is typically slightly shorter than the transverse diameter. *Obstetric conjugate indicates status of mid pelvis* - The **obstetric conjugate** specifically assesses the **pelvic inlet**, representing its anteroposterior dimension, not the midpelvis. - The **midpelvis** status is primarily evaluated by the **interspinous diameter**, which measures the distance between the ischial spines. *AP Diameter is the shortest diameter at brim* - The **anteroposterior (AP) diameter** of the brim, also known as the **obstetric conjugate**, is indeed often the **shortest diameter** of the pelvic inlet. - This diameter, typically around 11 cm, is clinically vital as it can sometimes limit the passage of the fetal head.

Question 976: Common indications for caesarean section in primigravidae are all except?

A. Cephalopelvic disproportion
B. Dystocia
C. Malpresentation
D. Failed induction (Correct Answer)

Explanation: ***Failed induction*** - While a reason for caesarean section, **failed induction** is typically more common in **multigravidae** due to a less favorable cervix or prior uterine scarring, and is less frequently the *initial* indication in primigravidae, who are often started on induction during their first pregnancy. - The other options represent more common, primary indications for caesarean section in **primigravidae**. *Cephalopelvic disproportion* - This is a significant indication in **primigravidae** where the baby's head is too large to pass through the mother's pelvis, often discovered during labor. - The unproven nature of the pelvis in a first pregnancy makes this a common reason for caesarean delivery. *Dystocia* - Refers to **difficult or prolonged labor**, which is a very common indication for caesarean section in **primigravidae**. - This can be due to abnormal uterine contractions, fetal malposition, or cephalopelvic disproportion. *Malpresentation* - Presentations such as **breech** or **transverse lie** are common indications for planned or emergency caesarean sections, especially in **primigravidae**. - Without prior vaginal deliveries, a trial of labor with malpresentation is generally considered riskier.

Question 977: A 30-year-old G2P1 is undergoing an elective repeat caesarean section at term. The infant is delivered without any difficulties, but the placenta cannot be removed easily because a clear plane between the placenta and uterine wall cannot be identified. The placenta is removed in pieces. This is followed by uterine atony and haemorrhage. All of the following are true regarding the condition except:

A. May require obstetric hysterectomy
B. Absence of Nitabuch's membrane
C. Previous LSCS is a predisposing factor
D. If placenta invades muscle and reaches serosa it is known as placenta increta (Correct Answer)

Explanation: ***If placenta invades muscle and reaches serosa it is known as placenta increta*** - **Placenta increta** refers to the invasion of the **myometrium (muscle)** only, not reaching the serosa. - When the placenta invades through the myometrium and reaches the **uterine serosa or beyond**, it is termed **placenta percreta**. *May require obstetric hysterectomy* - The inability to establish a clear plane between the placenta and uterine wall, coupled with a **postpartum hemorrhage**, is highly suggestive of **placenta accreta spectrum (PAS) disorders**. - **Obstetric hysterectomy** is often necessary in cases of PAS disorders to manage uncontrolled hemorrhage and save the mother's life. *Absence of Nitabuch's membrane* - The **pathophysiology of placenta accreta** involves the abnormal adherence of the placenta due to a defect in the decidua basalis. - This defect is characterized by the **partial or complete absence of Nitabuch's membrane**, which normally lies between the decidua and myometrium, preventing trophoblast invasion. *Previous LSCS is a predisposing factor* - A **previous lower segment cesarean section (LSCS)** is a significant risk factor for placenta accreta. - The uterine scar tissue from a prior LSCS provides a less resistant area for trophoblast invasion into the myometrium.

Question 978: To obtain true conjugate, the following factor should be subtracted from the diagonal conjugate:

A. 3.0 cm
B. 0.5 cm
C. 1.2 cm (Correct Answer)
D. 2.5 cm

Explanation: ***1.2 cm*** - The **true conjugate** is estimated by subtracting **1.5-2.0 cm** from the **diagonal conjugate**. - In clinical practice, **1.5 cm** is the commonly used value for this subtraction. - This subtraction accounts for the thickness of the **symphysis pubis** and overlying soft tissues. - Some sources may use values ranging from **1.2 to 2.0 cm** depending on clinical context. *3.0 cm* - Subtracting 3.0 cm would result in significant **underestimation** of the true conjugate. - This would lead to incorrect assessment of **pelvic adequacy** and potentially unnecessary interventions. - This value is well above the standard correction range. *0.5 cm* - Subtracting only 0.5 cm would lead to **overestimation** of the true conjugate. - This does not adequately account for the **symphysis pubis thickness** and soft tissue depth. - This could result in missed cases of **cephalopelvic disproportion**. *2.5 cm* - While 2.5 cm falls within some reported ranges, it is at the higher end of the correction spectrum. - Using this value might lead to slight **underestimation** of pelvic capacity. - The standard teaching emphasizes **1.5-2.0 cm** as the typical range.

Question 979: Pressure in ventouse assisted delivery is:

A. 0.6 kg/sq.cm
B. 0.4 kg/sq.cm
C. 0.8 kg/sq.cm (Correct Answer)
D. 1.0 kg/sq.cm

Explanation: ***0.8 kg/sq.cm*** - The standard recommended maximum negative pressure for **ventouse (vacuum) assisted delivery** is **0.8 kg/cm²**, which equates to roughly 60 cmHg or 500-600 mmHg. - This pressure level is generally considered effective for traction while minimizing the risk of fetal injury, such as **scalp trauma** or **cephalhaematoma**. *0.6 kg/sq.cm* - While it represents a lower pressure, **0.6 kg/cm²** might not provide sufficient traction for effective delivery in many cases. - Using a lower pressure may lead to **prolonged application time** or **failed vacuum extraction**, necessitating escalation to other delivery methods. *0.4 kg/sq.cm* - This pressure level is generally considered **too low** for most ventouse-assisted deliveries to achieve adequate traction. - Insufficient vacuum will likely result in **detachment of the cup** and failure to progress the delivery. *1.0 kg/ sq.cm* - Applying a pressure of **1.0 kg/cm²** is generally considered **excessive and potentially dangerous** for the fetus during vacuum extraction. - Higher pressures significantly increase the risk of severe **scalp injury**, **intracranial hemorrhage**, and other complications.

Question 980: An elderly multigravida female presents in labor. She has multiple fibroids in the lower uterine segment. Management is:

A. LSCS
B. Trial of labor
C. Vaginal delivery
D. Classical cesarean followed by hysterectomy (Correct Answer)

Explanation: ***Classical cesarean followed by hysterectomy*** - Multiple fibroids in the **lower uterine segment** can obstruct the birth canal and prevent safe vaginal delivery. In an **elderly multigravida** (suggesting completed family), when multiple fibroids involve the lower segment, a **classical cesarean section** may be necessary if the lower segment is severely compromised or inaccessible. - Following this with **hysterectomy** is considered **definitive management** because: (1) it eliminates the risk of **massive postpartum hemorrhage** from the fibroid-laden uterus, (2) prevents future complications like fibroid degeneration or growth, and (3) is appropriate when childbearing is complete. - This approach is preferred over attempting myomectomy or conservative management in an older patient with multiple lower segment fibroids who has completed childbearing. *LSCS* - While **LSCS (Lower Segment Cesarean Section)** can be attempted, multiple large fibroids in the lower uterine segment make this technically **very difficult** with significantly increased risk of hemorrhage during the incision and uterine closure. - LSCS alone may be feasible if fibroids are small or can be worked around, but in this scenario with **multiple** lower segment fibroids in an elderly multigravida, it does not provide **definitive management** of the underlying pathology and leaves the patient at risk for future complications. - This option would be more appropriate for a younger woman desiring future fertility. *Trial of labor* - A **trial of labor** is absolutely contraindicated due to the obstructing **multiple fibroids in the lower uterine segment**, which create significant risk of **obstructed labor**, **cephalopelvic disproportion**, and potential **uterine rupture**. - This approach would likely result in **failed progression of labor** and necessitate an emergency cesarean section under more adverse circumstances with higher maternal and fetal risks. *Vaginal delivery* - **Vaginal delivery** is not feasible when multiple fibroids occupy the lower uterine segment as they create a **mechanical obstruction** to fetal descent. - Attempting vaginal delivery would result in **obstructed labor** with serious risks including **fetal distress**, **uterine rupture**, and **maternal hemorrhage**.

Practice by Chapter

Physiology of Labor

Practice Questions

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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