Labor and Delivery Practice Questions

Q: What is the normal uterine blood flow at term?

500-700 ml/min. ***500-700 ml/min*** - At term, the uterus receives a substantial blood supply to meet the demands of the **growing fetus** and **placenta**. - This flow represents approximately **10-15% of the total cardiac output** in pregnant women. *50-75 ml/min* - This value is significantly **too low** for uterine blood flow at term. - Such a low flow would be insufficient to sustain fetal growth and development, leading to **fetal compromise**. *150-200 ml/min* - While an increase from non-pregnant levels, this value is still **below the normal range** for a full-term pregnancy. - It would not adequately perfuse the **placental bed** and transfer necessary nutrients and oxygen. *350-400 ml/min* - This range represents a considerable increase but is still somewhat **lower than the typical uterine blood flow at term**. - Uterine blood flow continues to increase throughout pregnancy, peaking in the **third trimester**.

Q: Which of the following represents the shortest transverse diameter of the fetal skull?

Bimastoid diameter. ***Bimastoid diameter*** - The **bimastoid diameter** is the shortest transverse diameter of the fetal skull, measuring approximately **7.5 cm** - It is the distance between the tips of the **mastoid processes** and is crucial for understanding the fetal head's fit through the maternal pelvis *Biparietal diameter (BPD)* - The biparietal diameter measures the distance between the two parietal eminences, typically around **9.5 cm** - It is a commonly used measurement in ultrasound to assess fetal growth and gestational age - This is a larger transverse diameter than the bimastoid *Bitemporal diameter* - The bitemporal diameter is measured between the furthest points on the coronal sutures, typically around **8.0 cm** - It is slightly larger than the bimastoid diameter but still considered a relatively narrow transverse measurement *Suboccipitobregmatic diameter* - The suboccipitobregmatic diameter is an **anteroposterior diameter**, not a transverse one, measuring from beneath the occipital bone to the center of the anterior fontanelle (bregma) - This diameter is approximately **9.5 cm** and is the optimal engaging diameter for vaginal birth when the head is well-flexed - This is not a transverse diameter and therefore cannot be the answer

Q: Cord prolapse is most likely with -

Footling breech. ***Footling breech*** - **Footling breech** (one or both feet presenting) is the presentation with the **highest risk** of umbilical cord prolapse, with rates as high as **10-20%**. - The small, irregular presenting part (feet) **does not fill the pelvic inlet adequately**, leaving significant space for the umbilical cord to slip past, especially during rupture of membranes. - This is a **classic obstetric emergency** requiring immediate cesarean delivery when cord prolapse occurs. *Transverse lie* - **Transverse lie** also carries a significantly elevated risk of cord prolapse because the shoulder or arm presents, with **no presenting part engaging the pelvis**. - However, transverse lie is usually **identified before labor** and managed with planned cesarean section, often with **controlled membrane rupture**, which may reduce the actual incidence compared to footling breech where spontaneous rupture can occur. *Vertex presentation with engaged head* - An **engaged vertex** presentation provides excellent protection against cord prolapse because the fetal head **fills the pelvic inlet**, effectively blocking the cord from descending. - This is the **lowest risk** presentation for cord prolapse. *Oligohydramnios* - **Oligohydramnios** (reduced amniotic fluid) is **NOT** a recognized risk factor for cord prolapse. - In fact, reduced fluid volume may limit cord mobility. The related condition **polyhydramnios** (excessive fluid) is associated with increased cord prolapse risk due to increased cord mobility and space.

Q: Which of the following is an absolute indication for caesarean section?

Central placenta previa. ***Central placenta previa*** - This condition involves the **placenta completely covering the internal cervical os**, blocking the birth canal. - A vaginal delivery would lead to severe, life-threatening **hemorrhage** for both the mother and the fetus, making a C-section mandatory. *Breech presentation* - While many breech presentations are delivered by C-section, it is not an absolute indication. - In certain situations, such as **frank breech** with adequate maternal pelvis and experienced obstetrician, a **vaginal delivery can be attempted** after careful evaluation. *Bad obstetric history* - This refers to a history of adverse pregnancy outcomes, but it is a **relative indication** and not an absolute one for C-section. - The decision for C-section would depend on the **specific nature of the previous adverse outcomes** and current pregnancy complications. *Previous caesarean delivery* - A prior C-section is a very common indication for repeat C-section, but it is **not an absolute indication** for all subsequent deliveries. - Many women with a previous C-section can safely undergo a **trial of labor after cesarean (TOLAC)**, especially if the prior incision was a low transverse uterine incision.

Q: Duration of second stage of labor depends upon -

Parity. ***Parity*** - **Nulliparous** women (first birth) typically have a longer second stage of labor due to less efficient pushing efforts and less compliant soft tissues. - **Multiparous** women (subsequent births) usually experience a shorter second stage because their pelvic floor and birth canal have stretched previously, making descent and expulsion of the fetus easier. *Size of fetus* - While a **macrosomic fetus** could potentially prolong the second stage, it is not the primary determinant compared to parity. - The duration of the second stage is more influenced by the **mother's physiology** and prior birth experience. *Mother's build* - A mother's general build or weight does **not directly determine** the duration of the second stage of labor. - Pelvic structure (pelvimetry) is more relevant than overall build, but even then, parity is a stronger predictive factor. *Lie of fetus* - The **lie of the fetus** (longitudinal, transverse, oblique) is crucial for the initiation and progression of labor, but once the fetus is in a longitudinal lie and engagement occurs, it is not the primary factor determining the *duration* of the second stage itself. - An **unfavorable lie** would likely prevent the onset of effective labor or necessitate a C-section before the second stage is even reached.

Q: Mediolateral episiotomy is preferred because?

Reduces damage to anal sphincter and anal canal. ***Reduces damage to anal sphincter and anal canal*** - The **mediolateral episiotomy** is cut at an angle away from the midline, significantly reducing the risk of extending into the **anal sphincter** and **rectum**. - This angulation helps to avoid severe perineal tears, protecting against **fecal incontinence** and other long-term complications. *Less blood loss* - **Mediolateral episiotomies** often result in more blood loss compared to midline episiotomies due to cutting across more muscle and blood vessels. - The angled incision involves a larger area of vascular tissue, increasing the potential for bleeding. *Easy to suture* - **Mediolateral episiotomies** are generally more complex and difficult to repair than midline episiotomies due to the irregular nature of the angled incision. - Achieving proper anatomical alignment and hemostasis can be challenging. *Easy technique* - While a commonplace procedure, the **mediolateral episiotomy** requires precise angulation and depth to ensure effective tissue release and avoid critical structures. - **Midline episiotomies** are technically simpler to perform due to their straightforward, sagittal incision, though they carry higher risks of severe tears.

Q: What is the optimal timing for the repair of an old complete perineal tear?

3 to 6 months after injury. ***3 to 6 months after injury*** - This timing allows sufficient time for **inflammation** to subside, **scar tissue** to mature, and tissues to heal, optimizing surgical outcomes for a stable repair. - Delaying the repair beyond the immediate postpartum period decreases **tissue friability** and the risk of **wound dehiscence**, which are common in acute repairs. *Immediately after injury* - Immediate repair of an **old complete perineal tear** is not indicated as the tissues are typically **inflamed**, **friable**, and potentially **infected**, leading to a high failure rate. - This timing is suitable for **acute perineal tears** (within hours after delivery), not for old, established tears. *6 to 9 months after injury* - While still feasible, waiting this long may lead to more **fibrotic tissue** and **atrophy** of the anal sphincter muscles, potentially complicating surgical dissection and recovery. - The optimal window for tissue condition for repair is generally considered to be somewhat earlier. *9 to 12 months after injury* - At this stage, the tissues may be more significantly **fibrotic** and less pliable, which can make surgical repair technically more challenging and potentially compromise the long-term functional outcome. - There is no added benefit to waiting this long compared to earlier repair, and functional recovery may be delayed.

Q: What is the risk of scar rupture in the lower segment of the uterus in patients with a previous cesarean section?

0.5 - 1.5%. ***0.5 - 1.5%*** - The risk of **uterine scar rupture** in a **lower segment Cesarean section** (LSCS) is generally low, ranging from 0.5% to 1.5% during a Trial of Labor After Cesarean (TOLAC). - This low risk is why **Vaginal Birth After Cesarean (VBAC)** is often considered a safe option for selected patients. *15 - 25%* - This percentage is significantly higher than the actual risk for a **lower segment Cesarean scar rupture**. Risks this high would generally lead to reconsideration of VBAC as a safe option. - Such a high risk is usually associated with a **classical (vertical) incision** on the uterus or multiple previous Cesarean sections. *2.5 - 3.5%* - This range is higher than the typical risk for a single **lower segment Cesarean scar rupture**. - While still relatively low, it might be observed in specific populations or with certain risk factors like a short inter-delivery interval or a single-layer uterine closure. *3.5 - 4.5%* - This risk is considerably elevated compared to the established risk for a **lower segment Cesarean scar rupture** and would generally lead to a more cautious approach to TOLAC. - This range can be associated with specific risk factors for scar dehiscence or rupture such as a history of multiple previous Cesarean sections or certain uterine anomalies.

Q: Which of the following is not a part of basic essential obstetric care?

Blood transfusion. ***Blood transfusion*** - While important in many obstetric emergencies, **blood transfusion** is considered part of **Comprehensive Essential Obstetric Care (CEmOC)**, not basic care. - **Basic Essential Obstetric Care (BEmOC)** focuses on the capability to perform key life-saving interventions but generally lacks the capacity for blood storage or transfusion. *Administration of parenteral antibiotics* - This is a crucial component of **Basic Essential Obstetric Care (BEmOC)**, used to manage infections such as **puerperal sepsis**. - It addresses one of the major causes of maternal mortality. *Administration of parenteral sedatives for eclampsia* - The management of **eclampsia** with parenteral anticonvulsants (e.g., magnesium sulfate) is a fundamental aspect of **Basic Essential Obstetric Care (BEmOC)**. - This intervention prevents and controls seizures, a severe complication of pre-eclampsia. - Note: While the question refers to "sedatives," the correct medical classification is **anticonvulsants**. *Administration of parenteral oxytocic drugs* - The use of **parenteral oxytocic drugs** (e.g., oxytocin) to prevent and treat **postpartum hemorrhage** is a core function of **Basic Essential Obstetric Care (BEmOC)**. - Postpartum hemorrhage is a leading cause of maternal death, and timely oxytocin administration is critical.

Question 1

What is the normal uterine blood flow at term?

Accepted Answer

500-700 ml/min

Answer

50-75 ml/min

Answer

150-200 ml/min

Answer

350-400 ml/min

Question 2

Which of the following represents the shortest transverse diameter of the fetal skull?

Accepted Answer

Bimastoid diameter

Answer

Biparietal diameter (BPD)

Answer

Bitemporal diameter

Answer

Suboccipitobregmatic diameter

Question 3

Cord prolapse is most likely with -

Accepted Answer

Footling breech

Answer

Oligohydramnios

Answer

Vertex presentation with engaged head

Answer

Transverse lie

Question 4

Engagement of head in labour means?

Accepted Answer

Largest diameter of the presenting part has crossed the pelvic brim

Answer

Smallest horizontal plane of the presenting part has crossed the pelvic outlet

Answer

Greatest horizontal plane of the presenting part has crossed the pelvic outlet

Answer

Smallest diameter of the presenting part has crossed the pelvic brim

Question 5

Which of the following is an absolute indication for caesarean section?

Accepted Answer

Central placenta previa

Answer

Breech presentation

Answer

Bad obstetric history

Answer

Previous caesarean delivery

Question 6

Duration of second stage of labor depends upon -

Accepted Answer

Parity

Answer

Size of fetus

Answer

Mother's build

Answer

Lie of fetus

Question 7

Mediolateral episiotomy is preferred because?

Accepted Answer

Reduces damage to anal sphincter and anal canal

Answer

Less blood loss

Answer

Easy to suture

Answer

Easy technique

Question 8

What is the optimal timing for the repair of an old complete perineal tear?

Accepted Answer

3 to 6 months after injury

Answer

Immediately after injury

Answer

6 to 9 months after injury

Answer

9 to 12 months after injury

Question 9

What is the risk of scar rupture in the lower segment of the uterus in patients with a previous cesarean section?

Accepted Answer

0.5 - 1.5%

Answer

15 - 25%

Answer

2.5 - 3.5%

Answer

3.5 - 4.5%

Question 10

Which of the following is not a part of basic essential obstetric care?

Accepted Answer

Blood transfusion

Answer

Administration of parenteral antibiotics

Answer

Administration of parenteral sedatives for eclampsia

Answer

Administration of parenteral oxytocic drugs

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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