Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 1051: Duration of second stage of labor depends upon -

A. Size of fetus
B. Mother's build
C. Parity (Correct Answer)
D. Lie of fetus

Explanation: ***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.

Question 1052: What is the optimal timing for the repair of an old complete perineal tear?

A. Immediately after injury
B. 3 to 6 months after injury (Correct Answer)
C. 6 to 9 months after injury
D. 9 to 12 months after injury

Explanation: ***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.

Question 1053: What is the risk of scar rupture in the lower segment of the uterus in patients with a previous cesarean section?

A. 0.5 - 1.5% (Correct Answer)
B. 15 - 25%
C. 2.5 - 3.5%
D. 3.5 - 4.5%

Explanation: ***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.

Question 1054: Which is the engaging diameter in occipitoposterior presentation?

A. Suboccipitofrontal (Correct Answer)
B. Mento vertical
C. Submentovertical
D. Bitrochanteric

Explanation: ***Suboccipitofrontal*** - In an occipitoposterior presentation, the fetal head is usually deflexed, causing the **suboccipitofrontal diameter** (approximately 10 cm) to be the engaging diameter. - This diameter extends from the junction of the occiput and the neck to the anterior part of the forehead (glabella). *Mentovertical* - The **mentovertical diameter** is the engaging diameter in a brow presentation, which is typically around 13.5 cm and usually makes vaginal birth impossible. - This diameter extends from the chin to the very top of the head (vertex). *Submentovertical* - The **submentovertical diameter** is the engaging diameter in a face presentation, measuring about 11.5 cm. - This diameter extends from below the chin to the vertex of the head. *Bitrochanteric* - The **bitrochanteric diameter** refers to the width between the fetal **trochanters** (hips) and is relevant for breech presentations, but not for cephalic presentations. - It is typically around 10 cm and is not involved in head engagement.

Question 1055: Which of the following is NOT a contraindication for induction of labour?

A. Hypertensive disease of pregnancy (Correct Answer)
B. Heart disease of pregnancy
C. Pelvic tumor
D. Vasa previa

Explanation: ***Hypertensive disease of pregnancy*** - **Hypertensive disorders** including **preeclampsia** and **gestational hypertension** are actually **INDICATIONS for induction of labor**, not contraindications - **Delivery is the definitive treatment** for preeclampsia and is recommended when maternal or fetal risks outweigh the benefits of expectant management - Induction is frequently performed in these conditions to prevent progression to severe complications like **eclampsia**, **HELLP syndrome**, or **placental abruption** - This is the correct answer as it is NOT a contraindication *Heart disease of pregnancy* - Most women with heart disease can safely undergo induction of labor with appropriate cardiac monitoring and support - However, **severe decompensated heart disease** (NYHA Class III-IV), **severe pulmonary hypertension**, **severe aortic stenosis**, or **peripartum cardiomyopathy** may require special consideration - While not an absolute contraindication to induction, severe cardiac conditions may favor planned cesarean delivery to minimize cardiac stress - The statement is somewhat imprecise but represents conditions where induction requires careful evaluation *Pelvic tumor* - A **pelvic tumor obstructing the birth canal** is an **absolute contraindication** to vaginal delivery and therefore to induction of labor - Examples include large **cervical fibroids**, **ovarian masses**, or other pelvic masses preventing descent of the presenting part - **Cesarean section** is mandatory in such cases to avoid **obstructed labor** and potential **uterine rupture** *Vasa previa* - **Vasa previa** is an **absolute contraindication** to both induction of labor and vaginal delivery - Unprotected fetal vessels crossing the **internal cervical os** are at high risk of rupture during cervical dilation or membrane rupture - This would result in rapid **fetal exsanguination** and **fetal death** - Requires **elective cesarean section** at 36-37 weeks before onset of labor

Question 1056: A multigravida patient with a 4 kg fetus has been in labor for 15 hours, with cervical dilation at 5 cm for the last 8 hours. What is the most appropriate management for this patient?

A. Cesarean section (Correct Answer)
B. Observe and monitor the patient
C. Perform amniotomy if indicated
D. Administer oxytocin for augmentation of labor

Explanation: ***Cesarean section*** - This patient is experiencing **arrest of active phase labor**, defined by no cervical change for ≥4 hours with adequate contractions, or ≥6 hours with inadequate contractions. With **8 hours of arrest at 5 cm**, this patient has exceeded both diagnostic thresholds, indicating **failure to progress**. - The presence of a **4 kg fetus (macrosomia)** in a multigravida who is not progressing despite adequate time suggests **cephalopelvic disproportion (CPD)**, making vaginal delivery unlikely to succeed. - Prolonged labor arrest significantly increases risks of **maternal exhaustion**, **chorioamnionitis**, **fetal distress**, and **postpartum hemorrhage**, making cesarean section the safest definitive management at this point. *Observe and monitor the patient* - Continued observation without intervention is inappropriate after **8 hours of cervical arrest**, as this far exceeds the diagnostic criteria for arrest of labor. - Further delay increases risks of **maternal morbidity** (infection, exhaustion, dehydration) and **fetal compromise** (acidosis, sepsis) without improving the likelihood of vaginal delivery. *Perform amniotomy if indicated* - Amniotomy can be used to **augment labor** and assess amniotic fluid for meconium, potentially shortening labor duration. - However, after **8 hours of arrest** with a likely **cephalopelvic disproportion** (4 kg fetus in arrested labor), amniotomy alone is insufficient and unlikely to resolve the underlying mechanical problem preventing descent and cervical dilation. *Administer oxytocin for augmentation of labor* - Oxytocin is appropriate for **augmenting inadequate contractions** in cases of protraction or early arrest of labor. - However, after **8 hours of arrest at 5 cm**, oxytocin would likely have already been attempted as part of active management. If labor has not progressed despite adequate time (exceeding the 6-hour threshold even with inadequate contractions), continuing oxytocin risks **uterine hyperstimulation**, **fetal distress**, and **uterine rupture** (especially in a multigravida) without achieving vaginal delivery given the probable CPD with a macrosomic fetus.

Question 1057: Which of the following is not typically given to a patient with preterm labor?

A. Tocolytic drugs
B. Antibiotics
C. Glucocorticoids
D. Beta blocker (Correct Answer)

Explanation: ***Beta blocker*** - **Beta blockers** are generally avoided in preterm labor because they can worsen **fetal bradycardia** and **neonatal hypoglycemia**. - They are not used to manage uterine contractions or promote fetal lung maturity. *Glucocorticoids* - **Glucocorticoids** (e.g., **betamethasone**) are administered to promote **fetal lung maturity** and reduce the risk of **respiratory distress syndrome** in preterm infants. - They are a crucial intervention in managing preterm labor. *Tocolytic drugs* - **Tocolytic drugs** (e.g., **nifedipine**, **terbutaline**) are used to **suppress uterine contractions** and delay delivery in preterm labor. - This allows time for glucocorticoids to take effect and for transfer to a facility with neonatal intensive care. *Antibiotics* - Although not routinely given to all patients with preterm labor, **antibiotics** are prescribed if there is evidence of an **intrauterine infection** or if the patient is positive for **Group B Streptococcus (GBS)**. - Infection can be a trigger for preterm labor, and treating it can help prolong pregnancy or prevent neonatal sepsis.

Question 1058: What is the most common position of engagement in vertex presentation?

A. Left Occiput Anterior (LOA) (Correct Answer)
B. Right Occiput Anterior (ROA)
C. Right Occiput Posterior (ROP)
D. Left Occiput Posterior (LOP)

Explanation: ***Left Occiput Anterior (LOA)*** - This is the **most common** fetal position for engagement, as the fetal head's **occiput** aligns with the maternal pelvis's **left anterior quadrant**. - The **long axis** of the fetal head is generally aligned with the **oblique diameter** of the maternal pelvis, facilitating descent. *Right Occiput Anterior (ROA)* - While an anterior position, **LOA** is more common due to the typical orientation of the **uterus and fetal spine**. - The fetal occiput is in the **right anterior quadrant** of the maternal pelvis. *Right Occiput Posterior (ROP)* - This is a **malposition** that can lead to **prolonged labor** and increased pain due to direct pressure on the sacrum. - The fetal occiput is in the **right posterior quadrant** of the maternal pelvis. *Left Occiput Posterior (LOP)* - Similar to ROP, this is also a **malposition** that may require significant **rotation** for successful vaginal delivery. - The fetal occiput is in the **left posterior quadrant** of the maternal pelvis.

Question 1059: Which type of pelvis is most accommodating for the occipitoposterior position during labor?

A. Anthropoid (Correct Answer)
B. Android
C. Gynaecoid
D. Platypelloid

Explanation: ***Anthropoid*** - The **anthropoid pelvis** is characterized by a long anteroposterior diameter and a narrow transverse diameter, which allows the fetal head in an **occipitoposterior (OP) position** to accommodate more easily. - Its oval shape facilitates a direct anterior-posterior delivery, reducing the need for extensive rotation when the occiput is posterior. *Android pelvis* - The **android pelvis** is heart-shaped with a narrow pubic arch and reduced diameters, making it unfavorable for *any* fetal presentation, especially OP. - This pelvic type is associated with a higher incidence of **arrest of labor** and requires more interventions during delivery. *Gynaecoid* - The **gynaecoid pelvis** is considered the classic female pelvis, with a rounded inlet and good proportions for vaginal delivery in an **occipitoanterior (OA) position**. - While generally favorable, its broader transverse diameter makes accommodation of an OP position less optimal compared to the anthropoid pelvis. *Platypelloid* - The **platypelloid pelvis** has a flattened shape with a short anteroposterior diameter and a wide transverse diameter. - This shape is highly unfavorable for vaginal delivery, as it obstructs engagement and descent of the fetal head in both OA and OP positions, leading to complications.

Question 1060: Given the following partogram data, identify the most likely diagnosis: Cervical dilation curve shows a prolonged labor with the cervical dilation falling to the right of the alert line.

A. Cephalopelvic Disproportion (CPD) (Correct Answer)
B. Rupture of the uterus during labor
C. Inadequate uterine contractions
D. Maternal exhaustion

Explanation: ***Cephalopelvic Disproportion (CPD)*** - A cervical dilation curve that crosses the **alert line** and approaches or crosses the **action line** on a partogram indicates **prolonged labor** or **arrest of labor**. This pattern is highly suggestive of CPD, where the fetal head is too large to pass through the maternal pelvis. - While other factors can cause prolonged labor, CPD is a common cause of **protracted active phase disorders** and **labor arrest**, characterized by a cervix that fails to dilate adequately despite sufficient contractions. *Inadequate uterine contractions* - While inadequate uterine contractions (hypotonic contractions) can lead to **prolonged labor**, the partogram does not provide direct information about the frequency or intensity of contractions to conclusively make this diagnosis. - If contractions were primarily the issue, augmenting labor with oxytocin would be expected to improve the dilation curve, which is not indicated as the primary problem here. *Rupture of the uterus during labor* - Uterine rupture is a catastrophic event typically presenting with sudden **severe pain**, **vaginal bleeding**, **fetal heart rate abnormalities**, and potentially **maternal shock**. - While it can lead to cessation of labor progress, the partogram pattern of a slowly deviating dilation curve over time is not characteristic of an acute uterine rupture. *Maternal exhaustion* - Maternal exhaustion is a common consequence of **prolonged labor** but is not a primary cause of labor arrest or a specific diagnosis reflected by the cervical dilation curve alone. - It often accompanies other underlying issues like CPD or inefficient uterine contractions, rather than being the sole etiology for the observed partogram.

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

Practice Questions

Fetal Monitoring Techniques

Practice Questions

Pain Management in Labor

Practice Questions

Induction and Augmentation of Labor

Practice Questions

Operative Delivery (Forceps and Vacuum)

Practice Questions

Cesarean Section: Indications and Techniques

Practice Questions

Dystocia and Abnormal Labor Patterns

Practice Questions

Obstetric Emergencies

Practice Questions

Postpartum Hemorrhage Management

Practice Questions

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