Labor and Delivery Practice Questions

Q: A partogram shows a laboring woman with a prolonged second stage of labor and a fetal heart rate of 120 bpm. Based on this information, what condition is most likely indicated?

Cephalopelvic Disproportion (CPD). ***Cephalopelvic Disproportion (CPD)*** - A **prolonged second stage** of labor, especially in the absence of obvious uterine inertia, strongly suggests a mismatch between the **fetal head size** and the maternal pelvis. - The fetal heart rate of 120 bpm is within a normal range, indicating the fetus is currently tolerating labor but does not rule out a mechanical obstruction. *Uterine rupture* - A uterine rupture is typically characterized by **sudden, severe abdominal pain**, **vaginal bleeding**, and often **fetal distress** (e.g., severe decelerations or bradycardia). - The given fetal heart rate of 120 bpm, while normal, does not align with the acute fetal compromise expected with a uterine rupture. *Prolonged labor due to maternal fatigue.* - While maternal fatigue can contribute to a prolonged labor, it usually manifests as **ineffective pushing efforts** rather than a fundamental obstruction in descent. - A normal fetal heart rate with a prolonged second stage still points to a mechanical issue that fatigue alone would not explain. *Prolonged labor due to weak uterine contractions.* - Weak uterine contractions (uterine inertia) would primarily lead to a **prolonged first stage** of labor or *arrest of dilation*, where the cervix fails to open adequately. - A prolonged second stage is more about fetal descent and expulsion, where contractions are still present but may be ineffective against an obstruction.

Q: What is the next step in the management of shoulder dystocia after the McRoberts maneuver?

Apply suprapubic pressure. ***Apply suprapubic pressure*** - After performing the **McRoberts maneuver**, the next recommended step in managing shoulder dystocia is to apply **suprapubic pressure**. - This maneuver is performed by an assistant who applies pressure with the heel of their hand directly above the maternal pubic bone, in a downward and lateral direction, to dislodge the anterior shoulder from under the symphysis pubis. *Perform a 90-degree rotation of the posterior shoulder* - This describes the Woods' screw maneuver, which is typically attempted after McRoberts and suprapubic pressure have failed. - The Woods' screw maneuver involves rotating the fetal shoulder, usually by trying to rotate the posterior aspect of the fetal shoulder anteriorly, to reduce the bisacromial diameter. *Consider emergency c-section* - A **cesarean section** is generally not considered an immediate option for an actively occurring shoulder dystocia during a vaginal delivery, as it is a time-sensitive emergency. - While a C-section would resolve the dystocia, it would require significant time to prepare and execute, which would risk fetal hypoxia and injury when the head is already delivered. *Perform internal rotation maneuvers* - This statement is too general; internal rotation maneuvers, such as the Woods' screw or Rubin maneuvers, are indeed used but typically after suprapubic pressure. - Rubin II maneuver involves rotating the anterior shoulder to a more oblique position, and the Woods' screw maneuver involves rotating the posterior shoulder. Both are attempted if suprapubic pressure and McRoberts prove ineffective.

Q: Which nerve is most commonly injured in McRoberts maneuver?

Femoral nerve. ***Femoral nerve*** - The **McRoberts maneuver** involves hyperflexion of the maternal hips, which can cause significant stretch on the maternal **lumbosacral plexus**. - Specifically, the **femoral nerve** (originating from L2-L4) can be compressed or stretched between the inguinal ligament and the hyperflexed thigh, leading to neuropathy. *Lumbosacral trunk* - While the **lumbosacral trunk** is part of the plexus, direct injury to its main body is less common than specific nerve branches during this maneuver. - The compression or stretch is often more focused on individual nerves passing through the pelvic outlet, such as the femoral nerve. *Obturator nerve* - The **obturator nerve** (L2-L4) passes through the obturator foramen and is less directly susceptible to injury from the hyperflexion of the hips in the McRoberts maneuver compared to the femoral nerve. - Its protected anatomical course makes it less vulnerable to the external forces applied during this maneuver. *Pudendal nerve* - The **pudendal nerve** (S2-S4) is typically associated with injury during vaginal delivery due to compression by the fetal head or forceps, not primarily from the hip hyperflexion in the McRoberts maneuver. - Its location deep within the perineum protects it from the mechanism of injury in the McRoberts maneuver.

Q: The pelvic inlet is usually considered to be contracted if its shortest anteroposterior diameter is less than 10 cm.

10 cm. ***10 cm*** - A pelvic inlet is clinically defined as **contracted** when its shortest anteroposterior diameter (the **obstetric conjugate**) is **less than 10 cm**. - This is the standard threshold used in obstetric practice to identify inlet contraction that may lead to **cephalopelvic disproportion**. - The normal obstetric conjugate measures approximately **10-11 cm**, so values below 10 cm indicate a contracted pelvis requiring careful assessment and management. *8 cm* - While 8 cm represents a **severely contracted pelvis** with significant risk of obstructed labor, it is not the defining threshold. - This measurement indicates **absolute contraction** where vaginal delivery is extremely difficult or impossible, but the standard definition of contraction begins at less than 10 cm. *12 cm* - A measurement of 12 cm for the obstetric conjugate is considered **normal to adequate**, well above the threshold for contraction. - This diameter would facilitate uncomplicated vaginal birth in most cases and poses no concern for inlet contraction. *14 cm* - An obstetric conjugate of 14 cm represents a **very capacious pelvis**, far exceeding normal measurements. - This measurement would pose no risk of cephalopelvic disproportion and indicates an unusually wide pelvic inlet.

Q: Prevalence of breech presentation at full term is ?

3-4%. ***3-4%*** - The prevalence of **breech presentation** at full term (37 weeks or more) is approximately **3-4%** of all singleton pregnancies. - While breech presentation is more common in earlier gestation, most fetuses spontaneously turn to a cephalic presentation by term. *10%* - A prevalence of **10%** for breech presentation is typically observed around **32 weeks of gestation**, not at full term. - This percentage significantly decreases as pregnancy progresses towards term. *6-7%* - A prevalence of **6-7%** for breech presentation is still higher than what is observed at full term. - This range might be encountered in earlier stages of the **third trimester** but not typically at 37 weeks or beyond. *1-2%* - A prevalence of **1-2%** is slightly lower than the generally accepted range for full-term breech presentations. - While some studies might report figures at the lower end, **3-4%** is the more commonly cited and accurate range.

Q: Engaging diameter in face presentation is?

Submentobregmatic. ***Submentobregmatic*** - In a **face presentation**, the fetal head is completely extended, causing the chin (**mentum**) to present. The engaging diameter is from the **submentum** (below the chin) to the **bregma** (anterior fontanelle). - This diameter measures approximately **9.5 cm** and is the smallest available diameter for engagement in face presentations that are in a **mentum-anterior** position. *Suboccipitobregmatic* - This is the engaging diameter in an **occiput-anterior presentation**, where the head is well-flexed. - It extends from the **subocciput** to the **bregma**, measuring around **9.5 cm**. *Occipitofrontal* - This diameter is involved in a **deflexed head presentation**, such as a **brow presentation**. - It measures about **11.5 cm** and extends from the **occiput** to the **frontal eminences**. *Mentovertical* - This is the engaging diameter for a **brow presentation**, where the head is partially extended. - It is the largest presenting diameter, measuring approximately **13.5 cm**, and typically leads to obstructed labor.

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 not an absolute contraindication for the use of methylergometrine?

Rh incompatibility. ***Rh incompatibility*** - **Rh incompatibility** is a condition related to blood type issues between mother and fetus, and it does not directly contraindicate the use of methylergometrine. - Methylergometrine's primary action is on uterine contractility and vasoconstriction, not directly affecting Rh immune responses. *Eclampsia* - **Eclampsia** is characterized by seizures in a pregnant woman with preeclampsia, often associated with severe hypertension. - Methylergometrine can exacerbate **hypertension** and therefore poses a significant risk for patients with eclampsia due to the potential for stroke or severe hypertensive crisis. *Heart disease* - **Heart disease**, especially conditions like **coronary artery disease** or **valvular heart disease**, is a contraindication due to methylergometrine's vasoconstrictive effects. - The drug can increase **blood pressure** and **cardiac afterload**, potentially leading to myocardial ischemia or heart failure exacerbation. *After delivery of first baby in twin pregnancy* - Administering methylergometrine after the delivery of the first twin but before the second is delivered can cause **strong uterine contractions**. - These contractions could **prematurely separate the placenta** of the second twin or lead to **fetal distress**, posing a significant risk to the undelivered twin.

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: 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**.

Question 1

A partogram shows a laboring woman with a prolonged second stage of labor and a fetal heart rate of 120 bpm. Based on this information, what condition is most likely indicated?

Accepted Answer

Cephalopelvic Disproportion (CPD)

Answer

Uterine rupture

Answer

Prolonged labor due to weak uterine contractions

Answer

Prolonged labor due to maternal fatigue

Question 2

What is the next step in the management of shoulder dystocia after the McRoberts maneuver?

Accepted Answer

Apply suprapubic pressure

Answer

Perform internal rotation maneuvers

Answer

Consider emergency c-section

Answer

Perform a 90-degree rotation of the posterior shoulder

Question 3

Which nerve is most commonly injured in McRoberts maneuver?

Accepted Answer

Femoral nerve

Answer

Lumbosacral trunk

Answer

Obturator nerve

Answer

Pudendal nerve

Question 4

The pelvic inlet is usually considered to be contracted if its shortest anteroposterior diameter is less than 10 cm.

Accepted Answer

10 cm

Answer

12 cm

Answer

14 cm

Answer

8 cm

Question 5

Prevalence of breech presentation at full term is ?

Accepted Answer

3-4%

Answer

10%

Answer

6-7%

Answer

1-2%

Question 6

Engaging diameter in face presentation is?

Accepted Answer

Submentobregmatic

Answer

Occipitofrontal

Answer

Suboccipitobregmatic

Answer

Mentovertical

Question 7

Cord prolapse is most likely with -

Accepted Answer

Footling breech

Answer

Oligohydramnios

Answer

Vertex presentation with engaged head

Answer

Transverse lie

Question 8

Which of the following is not an absolute contraindication for the use of methylergometrine?

Accepted Answer

Rh incompatibility

Answer

Eclampsia

Answer

Heart disease

Answer

After delivery of first baby in twin pregnancy

Question 9

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 10

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

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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