Labor and Delivery Practice Questions

Q: In an uncomplicated twin pregnancy, normal delivery should be attempted in which of the following situations?

First twin vertex presentation, second twin transverse lie. In twin pregnancies, the mode of delivery is primarily determined by the **presentation of the first twin (Twin A)**. ### **Why Option A is Correct** In an uncomplicated twin pregnancy, a trial of vaginal delivery is indicated if **Twin A is in vertex presentation**, regardless of the presentation of Twin B. * Once Twin A is delivered vaginally, the birth canal is dilated. * If Twin B is in a **transverse lie**, the obstetrician can perform an **internal podalic version** followed by breech extraction, or wait for the twin to spontaneously convert to a longitudinal lie (cephalic or breech) after the delivery of the first twin. ### **Why Other Options are Incorrect** * **Option B (Both Breech):** If the first twin is breech, a planned Cesarean Section (CS) is generally recommended to avoid the risk of **locked twins** (where the chin of the first breech twin gets hooked under the chin of the second cephalic twin) and to reduce the risk of birth asphyxia. * **Options C & D (First twin Transverse):** If the first twin is in a transverse lie, vaginal delivery is impossible and dangerous. A **Cesarean Section** is mandatory to prevent uterine rupture and cord prolapse. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Vertex-Vertex (40%):** Most common presentation; always attempt vaginal delivery. 2. **Vertex-Non-Vertex (35-40%):** Vaginal delivery is the preferred approach in most guidelines (like ACOG), provided the birth weight is >1500g. 3. **Non-Vertex First Twin:** Always an indication for **Cesarean Section**. 4. **Monoamniotic Twins:** These are always delivered via **Cesarean Section** at 32–34 weeks due to the high risk of umbilical cord entanglement. 5. **Time Interval:** The ideal time interval between the delivery of the first and second twin is usually within **30 minutes**, though as long as the fetal heart rate is stable, there is no strict cutoff.

Q: Indications of amnioinfusion include all of the following, except?

Treatment of late decelerations during labour. **Explanation:** Amnioinfusion is the transcervical or transabdominal instillation of isotonic fluid (usually Normal Saline or Ringer’s Lactate) into the amniotic cavity. **Why Option C is the Correct Answer (The Exception):** Late decelerations are caused by **uteroplacental insufficiency**, reflecting fetal hypoxia. Amnioinfusion does not improve placental perfusion or oxygen exchange across the placenta; therefore, it has no role in treating late decelerations. Management of late decelerations involves intrauterine resuscitation (maternal position change, oxygen, hydration) or urgent delivery. **Analysis of Incorrect Options:** * **Variable Decelerations (Option B):** This is the **most common indication**. Variable decelerations are caused by umbilical cord compression due to low liquor volume. Amnioinfusion cushions the cord, relieving compression and reducing the need for emergency Cesarean sections. * **Thick Meconium (Option D):** Amnioinfusion dilutes thick meconium, theoretically reducing the severity of Meconium Aspiration Syndrome (MAS), though its routine use for this is now debated in modern guidelines. * **Prolonged ROM with Oligohydramnios (Option A):** It is used prophylactically in cases of preterm premature rupture of membranes (PPROM) to prevent cord compression and potentially improve neonatal pulmonary outcomes. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Fluid:** Normal Saline or Ringer’s Lactate at room temperature (or warmed to 37°C). * **Infusion Rate:** Typically a bolus of 250–500 mL followed by a continuous infusion of 150–200 mL/hour. * **Contraindications:** Chorioamnionitis, placental abruption, fetal malpresentation, and non-reassuring fetal heart rate patterns requiring immediate delivery (e.g., prolonged bradycardia). * **Complication:** Iatrogenic polyhydramnios and uterine hypertonus.

Q: Tocolytics are beneficial in preterm labor because:

They provide time for antenatal steroids.. **Explanation:** The primary goal of tocolytic therapy in preterm labor is not to stop labor indefinitely, but to achieve a **"window of opportunity"** (usually 48 hours). This delay allows for the administration of **antenatal corticosteroids** (e.g., Betamethasone or Dexamethasone), which significantly accelerate fetal lung maturity and reduce the incidence of Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage (IVH), and Necrotizing Enterocolitis (NEC). It also allows time for **in-utero transfer** to a tertiary care center with a Neonatal ICU (NICU) and for **magnesium sulfate** administration for fetal neuroprotection (if <32 weeks). **Analysis of Options:** * **Option A & D:** Tocolytics are generally ineffective at permanently arresting preterm labor or prolonging pregnancy to term. Most agents only delay delivery by 48 hours to 7 days. * **Option B:** While tocolytics facilitate interventions that improve outcomes, they do not *directly* decrease perinatal mortality. The reduction in mortality is a secondary effect of the steroids and improved neonatal care. **NEET-PG High-Yield Pearls:** * **First-line Tocolytic:** **Nifedipine** (Calcium Channel Blocker) is currently the preferred agent due to its efficacy and safety profile. * **Atosiban:** A selective Oxytocin receptor antagonist; highly effective with fewer maternal side effects but expensive. * **Contraindications:** Tocolysis is contraindicated in cases of chorioamnionitis, severe pre-eclampsia, abruption, or fetal demise. * **Drug of Choice for Neuroprotection:** Magnesium Sulfate (given if delivery is imminent before 32 weeks).

Q: What is the most constant early symptom of uterine rupture during labor?

Pain. **Explanation:** Uterine rupture is a life-threatening obstetric emergency. The most constant early symptom is **abdominal pain**, which is typically described as sudden, sharp, and shooting in nature. This pain often persists even between uterine contractions and is frequently localized to the site of a previous scar (scar tenderness). **Why the other options are incorrect:** * **Shock (A):** While shock is a classic sign of rupture, it is often a **late** manifestation resulting from significant hemoperitoneum. It may not be present in the early stages, especially if the rupture is incomplete or bleeding is contained. * **Vaginal bleeding (C):** Bleeding is an inconsistent sign. In many cases of complete rupture, the bleeding is primarily **internal** (intraperitoneal), and external vaginal bleeding may be minimal or absent. * **Cessation of labor (D):** The sudden disappearance of uterine contractions is a classic sign, but it occurs **after** the rupture has taken place. Pain usually precedes the loss of uterine tone. **NEET-PG High-Yield Pearls:** * **Most common cause:** Dehiscence of a previous Cesarean section scar. * **Most common sign:** The most reliable and earliest **sign** (objective finding) is **fetal heart rate (FHR) abnormalities**, most commonly prolonged decelerations or bradycardia. * **Pathognomonic sign:** Recession of the presenting part (e.g., the fetal head moves back up the birth canal) is highly suggestive of rupture. * **Clinical triad:** Sudden abdominal pain, vaginal bleeding, and fetal distress/death.

Q: A 26-year-old primigravid woman at 42 weeks' gestation comes to the labor and delivery ward for induction of labor. The prenatal course was significant for a positive group B Streptococcus culture performed at 35 weeks. Antenatal testing over the past 2 weeks has been unremarkable. The patient is started on lactated Ringer's IV solution. Sterile vaginal examination shows that the patient's cervix is long, thick, and closed. Prostaglandin (PGE2) gel is placed into the vagina, and electronic fetal heart rate monitoring is continued. In approximately 60 minutes, the fetal heart rate falls to the 90s, as the tocodynamometer shows the uterus to be contracting every 1 minute with essentially no rest in between contractions. Which of the following was most likely the cause of the uterine hyperstimulation?

Prostaglandin (PGE2) gel. **Explanation:** The patient is experiencing **uterine tachysystole** (hyperstimulation), defined as >5 contractions in 10 minutes, which has led to fetal bradycardia (FHR in the 90s) due to impaired placental perfusion during the lack of uterine relaxation. **Why Prostaglandin (PGE2) is the cause:** Prostaglandins (like Dinoprostone/PGE2 and Misoprostol/PGE1) are used for cervical ripening in patients with an unfavorable Bishop score (long, thick, closed cervix). A known and significant side effect of exogenous prostaglandins is **uterine hyperstimulation**. Because PGE2 gel is administered vaginally, its absorption can sometimes trigger excessive myometrial activity. The temporal relationship here—symptoms starting 60 minutes after administration—strongly points to the PGE2 gel as the causative agent. **Why other options are incorrect:** * **Infection:** While chorioamnionitis can cause uterine irritability, it usually presents with maternal fever, fetal tachycardia (not bradycardia), and foul-smelling liquor. * **IV fluids:** Lactated Ringer’s is an isotonic crystalloid used for hydration and does not affect uterine contractility. * **Postdates pregnancy:** While post-term pregnancy (≥42 weeks) increases the risk of placental insufficiency and oligohydramnios, it does not inherently cause uterine tachysystole. **NEET-PG Clinical Pearls:** * **Management of PGE2-induced tachysystole:** The first step is to **remove the insert/gel** (if possible) and place the patient in the left lateral position. If fetal distress persists, **Tocolytics** (e.g., Terbutaline) may be administered. * **Bishop Score:** A score of **≤6** indicates an unfavorable cervix, necessitating ripening agents like PGE2 before starting Oxytocin. * **Contraindication:** Prostaglandins should be avoided in patients with a history of previous Cesarean section due to the increased risk of uterine rupture.

Q: Arrest of labor is defined as failure of the fetal head to descend within:

2 hours. **Explanation:** The diagnosis of **Arrest of Descent** is a critical component of managing the second stage of labor. According to standard obstetric guidelines (ACOG and Williams Obstetrics), in a **nulliparous woman**, arrest of descent is defined as the failure of the fetal head to descend for **2 hours** without regional anesthesia (epidural). If an epidural is present, an additional hour is allowed (total 3 hours). **Why Option B is Correct:** The second stage of labor is characterized by the active descent of the fetus through the birth canal. A period of 2 hours without progress indicates that the mechanical forces of labor (contractions and maternal pushing) are failing to overcome the resistance of the birth canal or that there is cephalopelvic disproportion (CPD). **Analysis of Incorrect Options:** * **Option A (1 hour):** This is too short a duration to diagnose arrest. Many women require more than an hour of active pushing to navigate the pelvic curves, especially in the first pregnancy. * **Option C (3 hours):** This is the threshold for arrest in a **nulliparous woman with an epidural**. It is not the standard definition for a general population without anesthesia. * **Option D (4 hours):** This exceeds the recommended time limits for the second stage and significantly increases the risk of maternal exhaustion, postpartum hemorrhage, and fetal distress. **NEET-PG High-Yield Pearls:** * **Second Stage Limits (Nullipara):** 2 hours (no epidural), 3 hours (with epidural). * **Second Stage Limits (Multipara):** 1 hour (no epidural), 2 hours (with epidural). * **Protraction vs. Arrest:** Protraction is slow progress; Arrest is **zero** progress. * **Friedman’s Curve:** While historically used, modern guidelines (Zhang’s criteria) allow for a longer first stage, but the 2-hour rule for arrest of descent remains a standard benchmark for intervention.

Q: What is the treatment of choice for a 30-year-old primipara in labor with a transverse lie?

Emergency cesarean section. **Explanation:** In a **transverse lie**, the long axis of the fetus is perpendicular to that of the mother. For a primipara in active labor, the treatment of choice is an **Emergency Cesarean Section**. This is because a transverse lie is an unstable lie that cannot be delivered vaginally. If labor continues, it can lead to serious complications such as cord prolapse (common due to the poorly applied presenting part), hand prolapse, or a "neglected transverse lie" resulting in uterine rupture. **Analysis of Options:** * **Internal Cephalic Version (A):** This is contraindicated in a singleton pregnancy and a live fetus. It is generally only reserved for the delivery of a **second twin** in a malpresentation. * **Wait and Watch (C):** This is dangerous. As labor progresses, the membranes are likely to rupture, leading to cord prolapse or an impacted shoulder, making surgery more difficult and increasing maternal-fetal morbidity. * **External Cephalic Version (D):** While ECV can be attempted before the onset of labor (usually around 36–37 weeks), it is **contraindicated once labor has commenced** and the membranes have potentially ruptured or the cervix has dilated significantly. **Clinical Pearls for NEET-PG:** * **Most common cause** of transverse lie in multipara is abdominal wall laxity; in primipara, it is often due to pelvic contraction or placenta previa. * **Dorso-superior** is the most common variety of transverse lie. * **The "Spontaneous Evolution"** (Denman’s or Douglas’ method) is a rare mechanism where a dead, small fetus is expelled doubled-up, but it should never be anticipated in clinical practice. * **Management Rule:** If the patient is in labor with a transverse lie, the answer is almost always **Cesarean Section**.

Question 1

In an uncomplicated twin pregnancy, normal delivery should be attempted in which of the following situations?

Accepted Answer

First twin vertex presentation, second twin transverse lie

Answer

Both twins breech presentation

Answer

First twin transverse lie, second twin longitudinal lie

Answer

First twin transverse lie, second twin frank breech

Question 2

In twin pregnancy, what is the treatment of choice when the first baby is in a transverse lie?

Accepted Answer

Cesarean section

Answer

Home delivery

Answer

High forceps

Answer

Low forceps after external rotation

Question 3

Indications of amnioinfusion include all of the following, except?

Accepted Answer

Treatment of late decelerations during labour

Answer

Prolonged rupture of membranes with oligohydramnios

Answer

Variable decelerations

Answer

Decreasing risk of meconium aspiration during labour in patients with thick meconium

Question 4

Tocolytics are beneficial in preterm labor because:

Accepted Answer

They provide time for antenatal steroids.

Answer

They arrest preterm labor.

Answer

They decrease prenatal mortality.

Answer

They prolong pregnancy to term.

Question 5

What is the most constant early symptom of uterine rupture during labor?

Accepted Answer

Pain

Answer

Shock

Answer

Vaginal bleeding

Answer

Cessation of labor

Question 6

A 32-year-old primigravida (G3 P1L1A0) at full term is admitted to the labor ward. On initial assessment, she exhibits uterine contractions every 2 minutes, lasting 30-35 seconds. Abdominal palpation reveals 3/5th of the fetal head palpable abdominally. Pelvic examination shows a cervical dilation of 4 cm with intact membranes. Four hours later, repeat pelvic examination shows 5 cm cervical dilation, with the fetal head station unchanged. Her cervicograph remains to the right of the alert line. Which of the following statements is true?

Accepted Answer

Her cervical progress suggests the need for intervention.

Answer

The fetal head was engaged at the time of presentation.

Answer

Her cervical progress is satisfactory.

Answer

On repeat examination, her cervicograph should have reached the action line.

Question 7

Treatment of cord prolapse is based on all of the following factors, except?

Accepted Answer

Fetal weight

Answer

Fetal viability

Answer

Fetal maturity

Answer

Cervical dilatation

Question 8

A 26-year-old primigravid woman at 42 weeks' gestation comes to the labor and delivery ward for induction of labor. The prenatal course was significant for a positive group B Streptococcus culture performed at 35 weeks. Antenatal testing over the past 2 weeks has been unremarkable. The patient is started on lactated Ringer's IV solution. Sterile vaginal examination shows that the patient's cervix is long, thick, and closed. Prostaglandin (PGE2) gel is placed into the vagina, and electronic fetal heart rate monitoring is continued. In approximately 60 minutes, the fetal heart rate falls to the 90s, as the tocodynamometer shows the uterus to be contracting every 1 minute with essentially no rest in between contractions. Which of the following was most likely the cause of the uterine hyperstimulation?

Accepted Answer

Prostaglandin (PGE2) gel

Answer

Infection

Answer

IV fluids

Answer

Postdates pregnancy

Question 9

Arrest of labor is defined as failure of the fetal head to descend within:

Accepted Answer

2 hours

Answer

1 hour

Answer

3 hours

Answer

4 hours

Question 10

What is the treatment of choice for a 30-year-old primipara in labor with a transverse lie?

Accepted Answer

Emergency cesarean section

Answer

Internal cephalic version

Answer

Wait and watch

Answer

External cephalic version

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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