Labor and Delivery Practice Questions

Q: Vaginal delivery can be allowed in all of the following conditions, EXCEPT:

Monochorionic, monoamniotic twins. **Explanation:** The correct answer is **A. Monochorionic, monoamniotic (MCMA) twins**. In MCMA twins, both fetuses share a single amniotic sac. This condition is a contraindication for vaginal delivery due to the extremely high risk of **umbilical cord entanglement** and subsequent fetal demise during labor. Current obstetric guidelines (ACOG/RCOG) recommend elective Cesarean Section at **32–34 weeks** of gestation to prevent late-term complications. **Analysis of Incorrect Options:** * **B. Mentoanterior (MA) presentation:** In this face presentation, the chin (mentum) is anterior. The submentobregmatic diameter (9.5 cm) presents to the pelvis, which is favorable for vaginal delivery. (Note: Mentoposterior is an indication for C-section as the head cannot extend further). * **C. Extended breech presentation:** Also known as Frank breech. Vaginal delivery is permissible if the pelvis is adequate, the fetus is not macrosomic, and the head is flexed. * **D. Dichorionic twins (First Vertex, Second Breech):** If the presenting twin is vertex, vaginal delivery is the standard of care. The second twin (breech) can be delivered via assisted breech extraction or external cephalic version. **High-Yield Clinical Pearls for NEET-PG:** * **Locked Twins:** Most common in Twin 1 Breech and Twin 2 Vertex. This is an absolute indication for C-section. * **Twin Delivery Rule:** If Twin 1 is non-vertex, C-section is generally indicated regardless of the second twin's position. * **MCMA Management:** Requires inpatient monitoring from 26–28 weeks and mandatory C-section by 34 weeks. * **Face Presentation:** "Mento-Anterior delivers; Mento-Posterior persists (requires C-section)."

Q: What is fetal scalp blood pH used to determine?

Fetal hypoxia. ### Explanation **Correct Answer: B. Fetal hypoxia** **Why it is correct:** Fetal scalp blood sampling (FBS) is a diagnostic procedure used to assess the acid-base status of a fetus when a Cardiotocograph (CTG) shows a non-reassuring or pathological pattern. When a fetus experiences **hypoxia** (oxygen deprivation), it shifts from aerobic to anaerobic metabolism, leading to the production of lactic acid. This results in **metabolic acidosis**, which is reflected by a drop in the fetal blood pH. * **pH >7.25:** Normal. * **pH 7.20 – 7.25:** Borderline (Pre-acidosis); repeat in 30 minutes. * **pH <7.20:** Significant acidosis (Hypoxia); indicates immediate delivery. **Why the other options are incorrect:** * **A. IUGR:** This is a clinical and sonographic diagnosis (using abdominal circumference and Doppler studies), not a biochemical one. * **C. Fetal diabetes:** There is no such clinical entity as "fetal diabetes." Maternal diabetes is monitored via maternal HbA1c and blood glucose levels. * **D. Alpha-fetoprotein (AFP):** This is a screening marker measured in maternal serum or amniotic fluid to detect neural tube defects or chromosomal anomalies, not via fetal scalp blood. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisites for FBS:** Ruptured membranes, cervix dilated at least 3 cm, and the fetal head must be engaged. * **Contraindications:** Fetal bleeding disorders (e.g., Hemophilia), maternal infections (HIV, Hepatitis B/C, active Herpes), and prematurity (<34 weeks). * **Lactate vs. pH:** Modern practice often uses **fetal scalp lactate** instead of pH, as it requires a smaller blood volume and is equally effective in identifying hypoxia.

Q: What is the recommended treatment for a transverse lie during labor?

Cesarean section. **Explanation:** In a **transverse lie**, the long axis of the fetus is perpendicular to the long axis of the mother. When a patient is in labor with a persistent transverse lie, a **Cesarean section** is the only safe and recommended mode of delivery. This is because vaginal delivery is mechanically impossible; the fetus cannot engage in the pelvic brim, and attempting labor poses a high risk of **cord prolapse** (due to the poorly applied presenting part) or **uterine rupture** if the labor becomes obstructed (neglected transverse lie). **Analysis of Incorrect Options:** * **A. Artificial Rupture of Membranes (ARM):** This is contraindicated. Rupturing membranes in a transverse lie leads to immediate decompression of the uterus and a very high risk of cord prolapse or arm prolapse. * **B. Oxytocin Infusion:** Augmenting labor is dangerous. Since the fetus cannot pass through the birth canal, oxytocin will lead to hyperstimulation against an obstruction, resulting in uterine rupture. * **C. Forceps Delivery:** Forceps can only be applied to a cephalic presentation that is well-engaged in the pelvis. It is impossible to apply forceps to a fetus in a transverse lie. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Multiparity (due to lax abdominal and uterine muscles). * **Pathognomonic Sign:** On abdominal examination, the fundal height is less than the period of gestation, and the fundus feels "empty." * **Management:** If diagnosed before labor (at >37 weeks), **External Cephalic Version (ECV)** can be attempted. However, once labor has commenced, Cesarean section is mandatory. * **Complication:** A "neglected transverse lie" leads to the formation of a **Bandl’s ring** (pathological retraction ring), signifying impending uterine rupture.

Q: Which of the following can cause a face presentation during labor?

Anencephaly. **Explanation:** Face presentation occurs when the fetal head is in a state of **complete extension**, causing the mentum (chin) to be the presenting part. **Why Anencephaly is the Correct Answer:** Anencephaly is the most common fetal cause of face presentation. In these fetuses, the absence of the cranial vault (calvarium) and the rudimentary development of the brain result in a lack of the normal fetal "attitude" of flexion. The absence of the vertex means there is no bony structure to engage normally, and the spinal muscles often pull the head backward, leading to a forced extension. **Analysis of Incorrect Options:** * **Contracted Pelvis:** While a contracted pelvis (specifically a flat pelvis) can cause malpresentations, it more commonly leads to **deflexed vertex** or **brow presentations**. If the head cannot engage, it may extend, but it is a less direct cause compared to the structural absence in anencephaly. * **Placenta Previa:** This typically results in **high floating heads** or **transverse/oblique lies** because the placenta occupies the lower uterine segment, preventing the head from entering the pelvis altogether. * **Thyroid Swelling:** While a massive fetal neck tumor (like a cystic hygroma or goiter) can mechanically prevent flexion and cause extension, a simple "thyroid swelling" is a less common and less specific cause compared to the classic association with anencephaly. **NEET-PG High-Yield Pearls:** * **Most common cause:** Multiparity (due to lax abdominal muscles). * **Most common fetal cause:** Anencephaly. * **Denominator:** Mentum (Chin). * **Engaging diameter:** Submentobregmatic (9.5 cm). * **Management:** Mentum Anterior (MA) can deliver vaginally; **Mentum Posterior (MP) cannot deliver vaginally** (the "long internal rotation" of 3/8th of a circle must occur to convert MP to MA).

Q: Which of the following is an example of abnormal fetal attitude?

Face presentation. ***Face presentation*** - Represents **abnormal fetal attitude** where the fetal head is hyperextended with the **face presenting** at the pelvic inlet instead of the vertex. - **Fetal attitude** refers to the degree of flexion of the fetal head and limbs; face presentation shows **hyperextension** of the neck, which is abnormal. *Breech presentation* - This describes **fetal presentation** (the part of fetus presenting at pelvic inlet), not fetal attitude. - In breech, the **buttocks or feet** present first, but the fetal attitude (degree of flexion) can still be normal. *Transverse position* - This refers to **fetal lie** (relationship of fetal long axis to maternal long axis), not fetal attitude. - In transverse lie, the fetus lies **perpendicular** to the maternal spine with **shoulder presenting** first. *Occiput posterior* - This describes **fetal position** (relationship of fetal presenting part to maternal pelvis), not fetal attitude. - **OP position** means the fetal occiput faces the **maternal sacrum**, but head flexion (attitude) remains normal.

Q: In a vertex presentation, what is the diameter of engagement?

Suboccipitobregmatic. In a **vertex presentation**, the fetal head is well-flexed, ensuring that the smallest possible diameter enters the pelvic inlet. ### Why Suboccipitobregmatic is Correct The **Suboccipitobregmatic (9.5 cm)** diameter extends from the undersurface of the occiput (at the junction with the neck) to the center of the bregma (anterior fontanelle). When the head is **completely flexed**, this is the diameter of engagement. It is the most favorable diameter for a spontaneous vaginal delivery because it easily fits through the maternal pelvis. ### Explanation of Incorrect Options * **Suboccipito-frontal (10 cm):** This diameter is involved when the head is **partially flexed**. It extends from the suboccipital region to the anterior end of the frontal bone. * **Occipitofrontal (11.5 cm):** This is the diameter of engagement in a **deflexed vertex** (military attitude). It extends from the occipital protuberance to the root of the nose (glabella). * **Bitemporal (8 cm):** While this is a transverse diameter of the fetal skull (distance between the two temples), it is not the primary longitudinal diameter of engagement in a vertex presentation. ### High-Yield Clinical Pearls for NEET-PG * **Mento-vertical (13.5 cm):** The largest diameter of the fetal head; seen in **Brow presentation**. It is usually too large to engage, often necessitating a C-section. * **Submento-bregmatic (9.5 cm):** The diameter of engagement in a **Face presentation** (fully extended head). * **Rule of Thumb:** As flexion increases, the diameter of engagement decreases, facilitating smoother labor. Complete flexion = Suboccipitobregmatic (9.5 cm).

Q: Which of the following is NOT related to face presentation during labor?

The diameter distending the vulval outlet is mentovertical.. In face presentation, the head is completely hyperextended, allowing the face to be the presenting part. **Explanation of the Correct Answer (C):** Option C is incorrect (and thus the right answer) because the **mentovertical diameter (14 cm)** is the largest diameter of the fetal head. If this diameter were to distend the vulva, vaginal delivery would be impossible. In a successful vaginal delivery of a face presentation (mentoanterior), the diameter that actually distends the vulval outlet is the **submentovertical (11.5 cm)** or **submentobregmatic (9.5 cm)**, depending on the degree of extension. **Analysis of Other Options:** * **A. Left Mentoanterior (LMA):** This is the most common position in face presentation, similar to how LOA is common in vertex presentations. * **B. Engaging Diameter:** The engaging diameter in a fully extended face presentation is the **submentobregmatic (9.5 cm)**. This is ironically the same measurement as the suboccipitobregmatic diameter in a well-flexed vertex presentation, which is why vaginal delivery is possible. * **D. Moulding:** Due to the hyperextension, the skull undergoes moulding where the **occipitofrontal diameter increases** (elongation), while the vertical diameters decrease. **High-Yield Clinical Pearls for NEET-PG:** * **Mento-Posterior (MP):** Vaginal delivery is **impossible** because the head cannot extend further to negotiate the sacral curve. "Persistent MP" requires a Cesarean section. * **Mento-Anterior (MA):** Vaginal delivery is possible. * **Commonest Cause:** Prematurity is the most common cause; in term pregnancies, it is often associated with anencephaly or high parity. * **Key Landmark:** The **Mentum** (chin) is the denominator.

Q: What is true about Frank breech presentation?

Thigh flexed, knee extended. In breech presentation, the fetus's buttocks or feet are the presenting parts. The classification depends entirely on the relationship between the fetal lower limbs and the trunk. **Correct Answer: B. Thigh flexed, knee extended** In **Frank breech** (also known as Extended breech), the fetal hips are flexed against the abdomen, but the knees are fully extended, with the feet lying close to the face. This is the most common type of breech presentation (60–70%), especially in primigravid women at term. **Explanation of Incorrect Options:** * **Option A (Thigh extended, leg extended):** This describes a **Footling breech** (specifically a single or double footling), where one or both feet are the presenting parts below the level of the buttocks. * **Option C (Both thighs and knees are flexed):** This describes a **Complete breech**. The fetus sits "tailor-fashion" with both hips and knees flexed. This is more common in multiparous women. * **Option D (Buddha's attitude):** This is a classic radiological sign seen in **fetal hydrops** or intrauterine fetal death (IUFD), where the fetus appears cross-legged with an edematous scalp and abdomen, not a standard breech description. **NEET-PG High-Yield Pearls:** 1. **Incidence:** Breech presentation occurs in approximately 3–4% of all deliveries at term. 2. **Cord Prolapse Risk:** Frank breech has the **lowest risk** of cord prolapse (0.5%) among all breech types because the buttocks form a tight fit against the cervix. Footling breech has the highest risk (15%). 3. **Vaginal Delivery:** Frank breech is the most favorable breech type for a trial of vaginal breech delivery. 4. **Pinard’s Maneuver:** This is used during the delivery of a Frank breech to flex the fetal knee and bring down the foot.

Q: A partogram is NOT used to monitor which of the following?

Fetal lung maturity. **Explanation:** The **Partogram** (or Partograph) is a graphical record of the progress of labor and key maternal and fetal observations. Its primary purpose is to provide a continuous pictorial overview of labor to facilitate the early identification of deviations from normal (e.g., prolonged or obstructed labor). **Why Option D is Correct:** **Fetal lung maturity** is a biochemical and physiological status assessed *before* the onset of labor, typically via amniocentesis (measuring the L/S ratio or Phosphatidylglycerol) or by gestational age. It cannot be monitored or determined by the clinical observations recorded on a partogram during active labor. **Why the other options are incorrect:** * **A. Cervical dilatation:** This is the most critical component of the partogram, plotted against time to monitor the rate of progress in the active phase of labor. * **B. Uterine contractions:** The frequency and duration (intensity) of contractions are recorded (usually as dots, hatching, or solid blocks) to ensure adequate labor power. * **C. Descent of head:** This is assessed via abdominal palpation (rule of fifths) and plotted to track the fetal station and progress through the birth canal. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Modified Partograph:** Starts at the **Active Phase** (defined as **≥4 cm** cervical dilatation). * **Alert Line:** A line starting at 4 cm representing the slowest 10% of primigravid labor (1 cm/hr). * **Action Line:** Drawn **4 hours to the right** of the alert line; crossing it indicates the need for intervention (e.g., augmentation or C-section). * **Fetal Heart Rate:** Recorded every 30 minutes. * **Maternal Parameters:** Includes pulse (every 30 mins), BP (every 4 hours), temperature, and urine output/protein.

Question 1

Vaginal delivery can be allowed in all of the following conditions, EXCEPT:

Accepted Answer

Monochorionic, monoamniotic twins

Answer

Mentoanterior presentation

Answer

Extended breech presentation

Answer

Dichorionic twins with first vertex and second breech

Question 2

What is fetal scalp blood pH used to determine?

Accepted Answer

Fetal hypoxia

Answer

Intrauterine growth restriction (IUGR)

Answer

Fetal diabetes

Answer

Estimation of alpha-fetoprotein

Question 3

What is the recommended treatment for a transverse lie during labor?

Accepted Answer

Cesarean section

Answer

Artificial rupture of membranes

Answer

Oxytocin infusion

Answer

Forceps delivery

Question 4

Which of the following can cause a face presentation during labor?

Accepted Answer

Anencephaly

Answer

Contracted pelvis

Answer

Placenta previa

Answer

Thyroid swelling

Question 5

Which of the following is an example of abnormal fetal attitude?

Accepted Answer

Face presentation

Answer

Breech presentation

Answer

Transverse position

Answer

Occiput posterior

Question 6

In a vertex presentation, what is the diameter of engagement?

Accepted Answer

Suboccipitobregmatic

Answer

Suboccipito-frontal

Answer

Occipitofrontal

Answer

Bitemporal

Question 7

A multigravida is in labor since 12 hours. On examination, the pulse rate is 116/min, blood pressure is 90/60 mmHg, the tongue is dry. Uterine contractions are 45 seconds long and felt every 3 minutes. The cervix is thick and 6-7 cm dilated. Membranes are absent, and the fetal head is at station -2 with a caput extending to station +3. Urine is blood-stained. What is the most likely diagnosis?

Accepted Answer

Obstructed labor.

Answer

Patient is in advanced labor with expected findings.

Answer

Prolonged labor.

Answer

Shoulder dystocia.

Question 8

Which of the following is NOT related to face presentation during labor?

Accepted Answer

The diameter distending the vulval outlet is mentovertical.

Answer

The commonest position is left mentoanterior (LMA).

Answer

The engaging diameter is submentobregmatic.

Answer

During moulding, there is elongation of the occipitofrontal diameter.

Question 9

What is true about Frank breech presentation?

Accepted Answer

Thigh flexed, knee extended

Answer

Thigh extended, leg extended

Answer

Both thighs and knees are flexed

Answer

Buddha's attitude

Question 10

A partogram is NOT used to monitor which of the following?

Accepted Answer

Fetal lung maturity

Answer

Cervical dilatations

Answer

Uterine contractions

Answer

Descent of head

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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