Labor and Delivery Practice Questions

Q: During uterine contraction of labour, what happens to the uterine blood flow?

Decreases. **Explanation:** The correct answer is **A. Decreases**. **Underlying Medical Concept:** During a uterine contraction, the intramyometrial pressure rises significantly. This pressure compresses the intramural vessels (arcuate and radial arteries) as they pass through the interlacing muscle fibers of the myometrium (often called the "living ligatures" of the uterus). As the intrauterine pressure exceeds the venous pressure and eventually approaches the arterial pressure, the blood flow to the intervillous space is significantly reduced. This is a physiological intermittent reduction in perfusion that a healthy fetus can tolerate due to the placental reserve. **Analysis of Incorrect Options:** * **B. Increases:** This is incorrect because the mechanical compression of blood vessels by the contracting myometrium physically restricts flow rather than enhancing it. * **C. Does not change:** This is incorrect as uterine hemodynamics are highly dynamic during labor; flow fluctuates in inverse proportion to the intensity of the contraction. * **D. Temporarily ceases:** This is generally incorrect for a normal physiological contraction. While blood flow is significantly *diminished*, it rarely ceases entirely unless the contraction is pathologically tetanic or hypertonic (e.g., in placental abruption or oxytocin overstimulation). **High-Yield Clinical Pearls for NEET-PG:** * **Placental Reserve:** A healthy fetus relies on the oxygen stored in the intervillous space during the peak of a contraction. * **Fetal Heart Rate (FHR):** If the uterine blood flow is compromised excessively (e.g., tachysystole), it leads to fetal hypoxia, manifesting as **late decelerations** on cardiotocography (CTG). * **Supine Hypotension Syndrome:** In the supine position, the gravid uterus compresses the IVC, further reducing venous return and subsequently decreasing uterine blood flow, which is why the **left lateral position** is preferred during labor.

Q: Induction of labor by amniotomy can lead to which of the following complications?

Cord prolapse. **Explanation:** **Amniotomy**, or Artificial Rupture of Membranes (ARM), is a common method for the induction or augmentation of labor. **Why Cord Prolapse is the Correct Answer:** The most immediate and serious mechanical complication of amniotomy is **umbilical cord prolapse**. When the membranes are ruptured, the sudden gush of amniotic fluid can wash the cord down into the vagina, especially if the fetal presenting part is not well-engaged in the pelvis (high station) or if there is malpresentation. To minimize this risk, amniotomy should ideally be performed only when the cervix is favorable and the fetal head is well-applied to the cervix. **Analysis of Incorrect Options:** * **B. Abruptio Placenta:** While sudden decompression of the uterus (e.g., in polyhydramnios) can theoretically cause placental separation, it is a much rarer complication compared to cord prolapse during routine induction. * **C. Rupture Uterus:** This is typically a complication of obstructed labor or the overzealous use of uterotonic drugs (like Oxytocin), rather than the mechanical act of amniotomy itself. * **D. Infection:** While prolonged rupture of membranes increases the risk of **Chorioamnionitis**, it is a delayed complication. Cord prolapse is the immediate, life-threatening risk associated with the procedure itself. **High-Yield Clinical Pearls for NEET-PG:** * **Prerequisite:** Always check the fetal heart rate (FHR) before and immediately after amniotomy to rule out cord compression/prolapse. * **Contraindication:** Amniotomy should be avoided if the presenting part is high and mobile (ballotable). * **Other complications:** These include vasa previa rupture (if fetal vessels cross the membranes) and fetal scalp trauma. * **Amniotomy + Oxytocin:** This combination is more effective for induction of labor than either method used alone.

Q: What is the best management for umbilical cord prolapse?

Cesarean section.. **Explanation:** Umbilical cord prolapse is an obstetric emergency where the cord descends below the presenting part after the rupture of membranes. This leads to cord compression between the fetus and the birth canal, causing acute fetal hypoxia and potential fetal demise. **Why Cesarean Section is the Correct Answer:** The definitive management for cord prolapse is **immediate delivery** to relieve compression. In the vast majority of clinical scenarios, the cervix is not fully dilated, making **Emergency Cesarean Section** the fastest and safest route to save the fetus. While waiting for surgery, the "knee-chest position" or manual elevation of the presenting part is performed to reduce pressure on the cord. **Why Other Options are Incorrect:** * **A. Replace the cord into the vagina:** This is contraindicated. Manipulating the cord can cause vasospasm of the umbilical arteries, further compromising fetal blood flow. It also delays definitive delivery. * **C. Immediate vaginal delivery:** This is only the correct choice if the cervix is **fully dilated (10 cm)** and the fetal head is low in the pelvis (engaged), allowing for a quick instrumental delivery (forceps/ventouse). Since the question asks for the "best" general management, C-section is the standard of care. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Sudden fetal bradycardia or deep variable decelerations following the rupture of membranes (spontaneous or artificial). * **Immediate First Aid:** Place the patient in the **Trendelenburg or Knee-chest position** and manually push the presenting part up (funic decompression). * **Bladder Filling:** The **Vago method** (instilling 500ml of saline into the bladder via catheter) can help elevate the presenting part if surgery is delayed. * **Occult Prolapse:** The cord is alongside the presenting part but not felt on PV exam; it is detected via CTG changes.

Q: Which of the following is a risk factor for breech presentation?

Oligohydramnios. **Explanation:** The fetal position is determined by the relationship between the fetus and the volume of amniotic fluid. By 32–34 weeks, the fetus usually undergoes **spontaneous version** to the cephalic position to accommodate the larger buttocks in the wider fundus and the smaller head in the narrower lower uterine segment. **1. Why Oligohydramnios is correct:** Breech presentation occurs when fetal movement is restricted or when the "flipping" mechanism is hindered. In **oligohydramnios**, the reduced volume of amniotic fluid creates a cramped intrauterine environment, preventing the fetus from performing the version required to reach a cephalic presentation. **2. Analysis of Incorrect Options:** * **Maternal Diabetes:** While associated with macrosomia and polyhydramnios (which can cause unstable lie), it is not a specific primary risk factor for breech. * **Anterior Placental Implantation:** This is a normal placental variation. However, **Placenta Previa** (low-lying placenta) is a major risk factor for breech because it occupies the lower segment, forcing the head upward. * **Preeclampsia:** This is a hypertensive disorder of pregnancy and does not directly influence fetal presentation, although it may lead to IUGR (which is a risk factor). **3. NEET-PG High-Yield Pearls:** * **Most common cause of breech:** Prematurity (the fetus hasn't turned yet). * **Uterine Factors:** Septate or bicornuate uterus and uterine fibroids (distort the cavity). * **Fetal Factors:** Hydrocephalus (large head fits better in the fundus), multiple gestations, and fetal anomalies. * **Placental Factors:** Placenta previa and cornual implantation. * **Amniotic Fluid:** Both **Oligohydramnios** (restricted movement) and **Polyhydramnios** (excessive movement leading to unstable lie) are risk factors.

Q: A 32-year-old female with a history of two mid-trimester abortions presents at 32 weeks of pregnancy with labor pains and a cervical os dilated to 2 cm. Which of the following interventions is NOT indicated?

Immediate cerclage. ### Explanation The correct answer is **A. Immediate cerclage**. **Why Immediate Cerclage is NOT indicated:** Cervical cerclage is a prophylactic or emergency procedure performed to manage cervical insufficiency, typically between **12–24 weeks** of gestation. At **32 weeks**, the patient is in active preterm labor (dilated to 2 cm). Performing a cerclage at this late stage is contraindicated because it increases the risk of iatrogenic rupture of membranes, chorioamnionitis, and uterine rupture. Once labor has established, the focus shifts to fetal lung maturity and delaying delivery briefly, rather than mechanical closure of the cervix. **Analysis of Incorrect Options:** * **B. Betamethasone:** Indicated for all women between 24 and 34 weeks of gestation at risk of preterm delivery within 7 days. It accelerates fetal lung maturity and reduces the risk of Respiratory Distress Syndrome (RDS) and intraventricular hemorrhage. * **C. Antibiotics:** Indicated for Group B Streptococcus (GBS) prophylaxis in preterm labor or if there is clinical suspicion of premature rupture of membranes/chorioamnionitis. * **D. Tocolytics:** Used for 48 hours to "buy time" to allow the full course of corticosteroids (Betamethasone) to work and to facilitate maternal transfer to a tertiary care center with a NICU. **NEET-PG High-Yield Pearls:** * **McDonald’s and Shirodkar’s procedures** are the two common types of cerclage. * **Rescue/Emergency Cerclage:** Can be done up to 24 weeks if the cervix is dilated but there is no labor or infection. * **Cut-off for Cerclage:** Generally not performed after **24–26 weeks** as the risks outweigh the benefits. * **Drug of Choice for Tocolysis:** Nifedipine (Calcium Channel Blocker) is currently the first-line agent. Atosiban is an alternative.

Q: The obstetrical conjugate is estimated indirectly from which measurement?

Diagonal conjugate. The pelvic inlet (brim) is the most critical area for assessing the progress of labor [1]. Among its diameters, the **Obstetrical Conjugate** is the most important clinical measurement because it represents the narrowest fixed distance through which the fetal head must pass [1]. ### Why Diagonal Conjugate is the correct answer: The obstetrical conjugate (extending from the sacral promontory to the posterior surface of the pubic symphysis) cannot be measured directly during a clinical examination because the pubic bone is in the way. Instead, clinicians perform a per-vaginal examination to measure the **Diagonal Conjugate** (from the sacral promontory to the lower border of the pubic symphysis). * **The Formula:** Obstetrical Conjugate = Diagonal Conjugate – (1.5 to 2.0 cm). ### Why other options are incorrect: * **True Conjugate (Anatomic Conjugate):** This is the distance from the sacral promontory to the upper border of the symphysis pubis. Like the obstetrical conjugate, it cannot be measured clinically. * **Oblique Conjugate:** This measures the distance from the sacroiliac joint on one side to the iliopubic eminence on the opposite side [1]. It is not used to estimate the anteroposterior diameters. * **Transverse Conjugate:** This is the widest distance between the terminal lines on either side [1]. It is a fixed anatomical measurement, not an indirect estimate for the obstetrical conjugate. ### NEET-PG High-Yield Pearls: 1. **Normal Values:** Diagonal Conjugate (~12.5 cm) > True Conjugate (~11 cm) > Obstetrical Conjugate (~10.5 cm). 2. **Clinical Tip:** If a clinician cannot reach the sacral promontory during a vaginal exam, the pelvic inlet is considered "adequate" for a normal delivery. 3. **Narrowest Diameter:** The **Interspinous diameter** (at the pelvic outlet/mid-pelvis) is the narrowest part of the birth canal overall, but the obstetrical conjugate is the narrowest part of the **inlet** [1].

Q: What is the color of normal amniotic fluid during term delivery?

Straw colored. **Explanation:** **Normal Amniotic Fluid Characteristics:** At term, normal amniotic fluid is typically **straw-colored** or colorless. It is initially clear but becomes slightly turbid as pregnancy progresses due to the presence of vernix caseosa, lanugo hair, and shed epithelial cells from the fetal skin. **Analysis of Incorrect Options:** * **Milky to yellowish green (Option A):** This indicates **Meconium-stained liquor**. It suggests fetal distress, where the fetus passes stool (meconium) in utero. Thick "pea-soup" green liquor is a clinical red flag for potential Meconium Aspiration Syndrome (MAS). * **Dark brown / Tobacco juice (Option B):** This is a classic sign of **Intrauterine Fetal Death (IUFD)**. The color results from the breakdown of hemoglobin and maceration of the fetus. * **Golden color (Option C):** This is characteristic of **Rh isoimmunization**. The color is due to excessive bilirubin resulting from fetal hemolysis. **High-Yield Clinical Pearls for NEET-PG:** * **Saffron color:** Suggests **Post-maturity** (Post-term pregnancy). * **Dark red / Port-wine color:** Suggests **Abruptio Placentae** (due to concealed hemorrhage/concealed accidental hemorrhage). * **Amniotic Fluid Index (AFI):** Measured via USG; normal range is 5–24 cm. 24 cm is Polyhydramnios. * **pH:** Amniotic fluid is alkaline (pH 7.0–7.5), which helps distinguish it from acidic vaginal secretions (pH 4.5) in cases of Premature Rupture of Membranes (PROM) using the Nitrazine test.

Question 1

A 34-week pregnant female presents with uterine contractions and no other risk factors. What is the next immediate step in management?

Accepted Answer

Expectant management

Answer

Tocolysis for 3 more weeks

Answer

Administer dexamethasone

Answer

Vacuum-assisted delivery

Question 2

During uterine contraction of labour, what happens to the uterine blood flow?

Accepted Answer

Decreases

Answer

Increases

Answer

Does not change

Answer

Temporarily ceases

Question 3

Induction of labor by amniotomy can lead to which of the following complications?

Accepted Answer

Cord prolapse

Answer

Abruptio placenta

Answer

Rupture uterus

Answer

Infection

Question 4

Which of the following statements is NOT true regarding a "show"?

Accepted Answer

It is blood of maternal origin.

Answer

It may be a cause of antepartum hemorrhage.

Answer

It is blood of fetal origin.

Answer

It is positive on a Singer's test.

Question 5

A 40-year-old primipara, infertile for 12 years, presents at 37 weeks gestation. The fetus is in breech presentation, with an estimated fetal weight of 3 kg. The pregnancy is otherwise uncomplicated, and the pelvis is adequate. What is the best management option?

Accepted Answer

Perform a cesarean section at 39 weeks

Answer

Await spontaneous onset of labor and normal vaginal delivery

Answer

Perform a cesarean section if labor becomes prolonged

Answer

Perform an external cephalic version

Question 6

What is the best management for umbilical cord prolapse?

Accepted Answer

Cesarean section.

Answer

Replace the cord into the vagina.

Answer

Immediate vaginal delivery.

Answer

None of the above.

Question 7

Which of the following is a risk factor for breech presentation?

Accepted Answer

Oligohydramnios

Answer

Maternal diabetes

Answer

Anterior placental implantation

Answer

Preeclampsia

Question 8

A 32-year-old female with a history of two mid-trimester abortions presents at 32 weeks of pregnancy with labor pains and a cervical os dilated to 2 cm. Which of the following interventions is NOT indicated?

Accepted Answer

Immediate cerclage

Answer

Betamethasone

Answer

Antibiotics

Answer

Tocolytics

Question 9

The obstetrical conjugate is estimated indirectly from which measurement?

Accepted Answer

Diagonal conjugate

Answer

True conjugate

Answer

Oblique conjugate

Answer

Transverse conjugate

Question 10

What is the color of normal amniotic fluid during term delivery?

Accepted Answer

Straw colored

Answer

Milky to yellowish green with mucus flakes

Answer

Dark brown

Answer

Golden color

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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