Operative Obstetrics Practice Questions

Q: Uterine rupture is most common in -

Classical cesarean section. ***Classical cesarean section*** - A **classical cesarean section** involves a vertical incision in the uterine fundus, which heals less strongly and is more prone to rupture in subsequent pregnancies or labor due to the higher muscle content and poorer healing. - The **thinness and weaker scar tissue** in the fundus compared to the lower segment contribute significantly to the increased rupture risk. *Anterior lower segment C.S* - A **lower segment transverse incision** is the most common type of cesarean section today and has a significantly lower risk of uterine rupture (around 0.2-0.5%) compared to classical incisions. - This is because the lower uterine segment is thinner and contains less muscle, leading to a **stronger and more robust scar**. *Placenta previa* - While **placenta previa** is a serious obstetric complication that can cause massive hemorrhage, it is not directly associated with uterine rupture. - It involves the placenta covering the cervical os, leading to bleeding, but does not inherently weaken the uterine wall to cause rupture. *Normal labor* - Uterine rupture in an unscarred uterus during normal labor is extremely rare, often associated with factors like **grand multiparity**, improper use of oxytocin, or obstructed labor. - The intact uterine wall is generally resilient enough to withstand the forces of labor without rupturing spontaneously.

Q: The optimal timing for external cephalic version (ECV) is

36 weeks. ***36 weeks*** - At **36 weeks gestation**, there is still enough **amniotic fluid** and fetal size is not too large, which allows for successful manipulation. - This timing is particularly optimal for **multiparous women** according to **RCOG guidelines** (36-37 weeks). - This timing also minimizes the risk of **spontaneous reversion** back to a breech presentation before labor begins. - Balances adequate fetal maturity with sufficient uterine space for successful version. *34 weeks* - Performing an external cephalic version (ECV) at 34 weeks has a lower success rate and a higher chance of **spontaneous reversion** due to the smaller fetal size and relatively more amniotic fluid. - The chance of **spontaneous cephalic version** (natural turning) is still significant at this stage, making an earlier intervention potentially unnecessary. - Too early for routine ECV as many breech presentations spontaneously convert to cephalic before 36 weeks. *38 weeks* - By 38 weeks, the fetus is larger and there is proportionally less **amniotic fluid**, which makes successful external version more difficult and painful for the mother. - While **ACOG recommends 37-38 weeks**, the success rate decreases with advancing gestation due to reduced uterine space. - The risk of **uterine contractions** and iatrogenic induction of labor is higher at this gestation. *40 weeks* - At 40 weeks, the fetus is at term and much larger, occupying most of the uterine cavity, significantly reducing the chances of a successful external version. - The risk of complications such as **placental abruption**, **cord compression**, and premature labor is increased. - Success rates are markedly lower, making routine ECV at this stage generally not recommended.

Q: What is the most common complication that can arise from vacuum delivery during childbirth?

Cephalohematoma. ***Cephalohematoma*** - A cephalohematoma is a collection of blood between the **periosteum and the skull bone**, typically forming over the parietal bone. - It is the **most common complication** of vacuum delivery, occurring in **6-26% of vacuum-assisted deliveries**. - It presents as a firm, fluctuant swelling that **does not cross suture lines** and typically appears several hours after delivery. - Usually **self-limiting** and resolves spontaneously over weeks to months, though it may be associated with hyperbilirubinemia. *Subgaleal hemorrhage* - This is a more serious but **less common** complication (0.4-0.6% incidence) involving bleeding into the **potential space between the galea aponeurotica and the periosteum**. - Can lead to significant blood loss and hypovolemic shock due to the large potential space that can accommodate substantial blood volume. - Requires immediate recognition and management, but its lower incidence makes it less common than cephalohematoma. *Scalp lacerations* - Occur in approximately **13% of vacuum deliveries** but are less common than cephalohematoma. - Typically superficial and heal well with minimal intervention. - Result from the rim of the vacuum cup causing trauma to the scalp tissue. *Retinal hemorrhages* - Occur in up to **40-50% of all vaginal deliveries** (both spontaneous and assisted), making them common but not specific to vacuum delivery. - Usually **asymptomatic and self-limiting**, resolving within days to weeks without sequelae. - While common, cephalohematoma remains the most frequently documented **specific complication** of vacuum extraction.

Q: What is a definitive indication for performing a Lower Segment Cesarean Section (LSCS)?

Contracted pelvis. ***Contracted pelvis*** - A **contracted pelvis** means the maternal pelvic dimensions are too small to allow for the safe passage of the fetus, making a vaginal birth impossible or highly risky. - This **fetopelvic disproportion** (cephalopelvic disproportion) necessitates a C-section to prevent obstructed labor, fetal distress, and potential harm to both mother and baby. - A contracted pelvis is a **definitive indication** for LSCS as vaginal delivery is contraindicated. *Mento anterior presentation* - In a **mento anterior presentation**, the fetal chin (mentum) is anterior, which is a **favorable position** for vaginal delivery as it allows for proper neck extension and engagement. - This presentation does not typically require a C-section unless there are other complicating factors. *Occipito posterior presentation* - While an **occipito posterior presentation** can sometimes lead to prolonged labor or the need for instrumental delivery, it is **not an absolute indication** for C-section. - Many cases can still deliver vaginally, either spontaneously or with rotation, and surgical intervention is usually reserved for failure to progress or fetal distress. *Vertex presentation* - A **vertex presentation** means the fetal head is flexed and presenting first, which is the **most common and ideal presentation** for a vaginal birth. - This presentation is a sign of a normal, potentially uncomplicated delivery and is the opposite of an indication for C-section.

Q: The prostaglandin most commonly used for the termination of a second-trimester pregnancy is:

PGE1. ***PGE1 (misoprostol)*** - **PGE1 analogues**, such as **misoprostol**, are the **most commonly used prostaglandins** for second-trimester pregnancy termination globally. - **Key advantages**: Low cost, stable at room temperature, highly effective for cervical ripening and inducing uterine contractions, and excellent safety profile. - Administered orally, vaginally, sublingually, or buccally, offering flexibility in clinical settings. - **WHO-recommended regimen**: Mifepristone followed by misoprostol is the preferred protocol for second-trimester medical termination. *PGI2 (prostacyclin)* - **PGI2** is primarily a vasodilator and inhibitor of platelet aggregation, not used for inducing uterine contractions. - Clinical applications include **pulmonary hypertension** and peripheral vascular disease, but it has no role in pregnancy termination. *PGA2* - **PGA2** is a naturally occurring prostaglandin with minimal clinical use. - Not employed in obstetric practice for cervical ripening or pregnancy termination. *15-methyl prostaglandin F2 alpha (carboprost)* - **Carboprost** is a synthetic PGF2α analogue that can induce strong uterine contractions. - While it has been used for second-trimester termination, it is **not the most commonly used agent** due to significant side effects including severe GI symptoms (nausea, vomiting, diarrhea), bronchospasm, and higher cost. - Currently, its **primary indication** is management of **refractory postpartum hemorrhage** due to uterine atony. - **Misoprostol is preferred** over carboprost for second-trimester termination due to better tolerability, lower cost, and ease of administration.

Q: Ventouse in 2nd stage of labour is contraindicated in:

Preterm labour. ***Preterm labour*** - **Ventouse delivery** is contraindicated in **preterm labour** due to the increased risk of **cephalohaematoma**, **intracranial haemorrhage**, and **neonatal jaundice** in pre-term infants whose skulls are more fragile. - The use of traction on a premature skull can easily cause trauma, making premature birth a major contraindication for vacuum extraction. *Persistent occipito-posterior position* - This is an indication for instrumental delivery, including **ventouse**, when rotation assistance is needed or delivery is complicated. - **Ventouse** can be used to achieve rotation and descent in this position, making it a viable option rather than a contraindication. *Heart disease* - **Ventouse delivery** can be indicated in women with **cardiac conditions** to shorten the second stage of labour, thereby reducing maternal exertion and cardiovascular strain. - It is used to prevent the physiological stress of prolonged pushing, which can exacerbate underlying heart disease. *Uterine inertia* - **Ventouse delivery** can be used to expedite delivery when there is inadequate uterine contraction leading to **uterine inertia**, and the cervix is fully dilated. - This condition prolongs labour, and instrumental delivery can help achieve birth without resorting to a C-section in some cases.

Q: In which of the following conditions is the use of forceps contraindicated?

Hydrocephalus (enlarged head). ***Hydrocephalus (enlarged head)*** - The use of forceps in cases of **hydrocephalus** can result in severe trauma to both the fetal head and the maternal birth canal due to the disproportionately large fetal head. - The increased risk of **intracranial hemorrhage**, skull fractures, and severe maternal soft tissue injury makes forceps delivery highly contraindicated. *Twin delivery* - Forceps can be used in twin deliveries, especially for the second twin, to expedite delivery or manage presentations if there are no other contraindications. - The decision depends on various factors such as presentation, size, and fetal well-being, but twin delivery itself is not a contraindication. *Post maturity* - **Post-maturity** itself is not a contraindication for forceps delivery, although these fetuses may be larger or have less resilient skulls. - Forceps may be considered if there's a need to shorten the second stage of labor due to **fetal distress** or maternal exhaustion in a post-term pregnancy, provided there's adequate fetal head engagement and no significant cephalopelvic disproportion. *After coming head of breech* - Forceps, specifically **Piper forceps**, are often indicated and used in the delivery of the **aftercoming head of a breech presentation**. - This maneuver helps to control the rate of head delivery, preventing sudden decompression and providing stability, which reduces the risk of fetal head trauma and intracranial hemorrhage.

Q: Uterine rupture is least common with which of the following surgical techniques?

LSCS. ***LSCS*** - A **low transverse uterine incision** (LSCS) is associated with the **lowest risk of uterine rupture** in subsequent pregnancies due to the lower uterine segment's thinner muscle and better healing properties. - The scar from an LSCS is less likely to undergo dehiscence during labor compared to incisions in the thicker, more contractile upper uterine segment. *Classical section* - A **classical uterine incision** (vertical incision in the upper uterine segment) carries the **highest risk of uterine rupture** in subsequent pregnancies. - This is because the upper uterine segment is thicker and more contractile, leading to a weaker scar that is more prone to tearing during labor. *T Shaped incision* - A **T-shaped incision** involves a transverse cut with a vertical extension, carrying a **high risk of uterine rupture**. - The combination of perpendicular incisions compromises the uterine wall's integrity more severely than a simple transverse cut. *Inverted T shaped incision* - An **inverted T-shaped incision** is a complex uterine incision that extends vertically into the fundus from a transverse cut, making it structurally weaker. - This type of incision significantly **increases the risk of uterine rupture** in future pregnancies due to the extensive scarring across multiple planes of muscle fibers.

Q: What is a potential complication of performing internal podalic version for a transverse lie?

Uterine rupture. ***Uterine rupture*** - **Internal podalic version** involves inserting a hand into the uterus to grasp the fetal feet and forcibly manipulate the fetus, carrying a **significant risk of uterine trauma**. - This risk is particularly high with **transverse lie**, especially if the uterus is already thinned, scarred from previous surgeries (e.g., cesarean section), or if contractions are present. - **Uterine rupture** is the most serious and characteristic complication of this procedure, which is why internal podalic version is now largely **obsolete** in modern obstetrics. *Uterine atony* - **Uterine atony** refers to loss of myometrial tone causing postpartum hemorrhage, typically occurring *after* placental delivery. - This is not a direct complication of the internal podalic version *procedure itself*, but rather a consequence of uterine exhaustion after prolonged labor or retained placental tissue. *Cervical laceration* - **Cervical lacerations** can occur during vaginal delivery, particularly with rapid or precipitous delivery, but are not the primary risk of internal podalic version. - The procedure focuses on intrauterine manipulation of the fetus, not on the cervix, making cervical trauma a secondary concern compared to uterine rupture. *Vaginal laceration* - **Vaginal lacerations** are typically associated with passage of the fetal head during delivery, instrumental deliveries, or episiotomies. - While delivery following version may carry this risk, the version procedure itself primarily threatens the uterine wall, not the vagina.

Q: Which of the following is NOT a prerequisite for the application of outlet forceps?

Uterus contracting. ***Uterus contracting*** - Uterine contractions are important for **effective labor progression** but are not a strict prerequisite for the *application* of outlet forceps. - The decision to use outlet forceps often arises when there is a need to **expedite delivery** due to fetal distress or maternal exhaustion, regardless of ongoing contractions. *Engaged head* - An engaged head (typically defined as the widest diameter of the fetal head having passed through the pelvic inlet) is crucial for instrumental delivery to ensure that the **forceps can grasp the head properly** and effectively. - Without engagement, there's a higher risk of **failed intervention** or complications. *Fetal head at station +2 or lower* - For outlet forceps, the fetal head must be at **station +2 or lower**, meaning the leading bony point of the fetal head is at least 2 cm below the level of the ischial spines. - This ensures the head is sufficiently low in the pelvis for a **safe and successful application** of the forceps. *Fully dilated cervix* - A **fully dilated cervix** (10 cm) is an absolute prerequisite for any forceps application to prevent significant cervical trauma, hemorrhage, and other complications. - Applying forceps through a partially dilated cervix can lead to **severe maternal morbidity**.

Question 1

Uterine rupture is most common in -

Accepted Answer

Classical cesarean section

Answer

Anterior lower segment C.S

Answer

Placenta previa

Answer

Normal labor

Question 2

The optimal timing for external cephalic version (ECV) is

Accepted Answer

36 weeks

Answer

34 weeks

Answer

38 weeks

Answer

40 weeks

Question 3

What is the most common complication that can arise from vacuum delivery during childbirth?

Accepted Answer

Cephalohematoma

Answer

Subgaleal hemorrhage

Answer

Scalp lacerations

Answer

Retinal hemorrhages

Question 4

What is a definitive indication for performing a Lower Segment Cesarean Section (LSCS)?

Accepted Answer

Contracted pelvis

Answer

Mento anterior presentation

Answer

Occipito posterior presentation

Answer

Vertex presentation

Question 5

The prostaglandin most commonly used for the termination of a second-trimester pregnancy is:

Accepted Answer

PGE1

Answer

PGI2

Answer

PGA2

Answer

15-methyl prostaglandin F2 alpha

Question 6

Ventouse in 2nd stage of labour is contraindicated in:

Accepted Answer

Preterm labour

Answer

Uterine inertia

Answer

Persistent occipito-posterior position

Answer

Heart disease

Question 7

In which of the following conditions is the use of forceps contraindicated?

Accepted Answer

Hydrocephalus (enlarged head)

Answer

Twin delivery

Answer

Post maturity

Answer

After coming head of breech

Question 8

Uterine rupture is least common with which of the following surgical techniques?

Accepted Answer

LSCS

Answer

Classical section

Answer

T Shaped incision

Answer

Inverted T shaped incision

Question 9

What is a potential complication of performing internal podalic version for a transverse lie?

Accepted Answer

Uterine rupture

Answer

Uterine atony

Answer

Cervical laceration

Answer

Vaginal laceration

Question 10

Which of the following is NOT a prerequisite for the application of outlet forceps?

Accepted Answer

Uterus contracting

Answer

Engaged head

Answer

Fetal head at station +2 or lower

Answer

Fully dilated cervix

Operative Obstetrics — MCQs

Operative Obstetrics — MCQs

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