Labor and Delivery Practice Questions

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**.

Q: All of the following are used for induction of labour, EXCEPT?

Prostaglandin F2 alpha tablet. **Explanation:** The goal of **Induction of Labour (IOL)** is to initiate uterine contractions and achieve cervical ripening in a pregnant woman who is not in labor. **Why Option A is the Correct Answer:** **Prostaglandin F2 alpha (PGF2α)**, such as Carboprost or Dinoprost, is a potent uterotonic but is **not used for induction of labor**. Its primary clinical application is the management of **Postpartum Hemorrhage (PPH)** and mid-trimester abortions. When used in a viable pregnancy for induction, PGF2α carries a high risk of uterine hyperstimulation, fetal distress, and systemic side effects (like bronchospasm), making it unsafe for this purpose. **Analysis of Incorrect Options:** * **Option B & D (PGE1 / Misoprostol):** Misoprostol is a synthetic PGE1 analogue. It is highly effective for both cervical ripening and induction. It can be administered vaginally, orally, or sublingually (though vaginal/oral are preferred for induction). * **Option C (PGE2 / Dinoprostone):** This is the "gold standard" for induction of labor, especially when the Bishop score is unfavorable. It is available as an intracervical gel or a sustained-release vaginal insert. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice for Induction:** PGE2 (Dinoprostone) is generally preferred over PGE1 due to a lower risk of tachysystole. * **Misoprostol Dose:** For induction at term, the dose is **25 mcg** every 4–6 hours. (Note: 200–800 mcg is used for PPH/Abortion). * **Contraindication:** Prostaglandins are generally avoided for induction in women with a **previous Cesarean section** due to the increased risk of uterine rupture. * **Mechanical Methods:** If pharmacological methods are contraindicated, Foley’s catheter bulb or ARM (Artificial Rupture of Membranes) can be used.

Q: Deep transverse arrest is seen in which fetal head presentation?

Occipito-posterior position. Deep transverse arrest is a classic complication of the **Occipito-posterior (OP)** position, specifically during the mechanism of labor known as "long rotation." ### 1. Why Occipito-posterior is Correct In a persistent OP position, the fetal head must rotate **135° anteriorly** to reach the symphysis pubis. If there is a failure of rotation due to weak uterine contractions or a flat (platypelloid/android) pelvis, the head may get arrested midway at the level of the ischial spines. At this point, the sagittal suture lies in the **transverse diameter** of the pelvic outlet. Because the bi-parietal diameter is caught between the ischial spines, further descent is impossible, leading to **Deep Transverse Arrest**. ### 2. Why Other Options are Incorrect * **Occipito-anterior (OA):** This is the normal position. The head only needs to rotate 45° to be delivered; there is no "long rotation" required, so arrest in the transverse diameter does not occur. * **Breech delivery:** The presenting part is the buttocks/feet, not the vertex. While "arrest of the after-coming head" can occur, "deep transverse arrest" is a specific term reserved for vertex presentations. * **Face presentation:** Arrest here usually occurs in the **Mento-posterior** position (where the chin is towards the sacrum), as the neck cannot extend further to negotiate the pelvic curve. ### 3. NEET-PG High-Yield Pearls * **Prerequisites for DTA:** The head must be at the level of the **ischial spines** (Station 0), and the sagittal suture must be in the **transverse diameter**. * **Management:** If the pelvis is adequate, rotation and extraction via **Kielland’s Forceps** or Ventouse can be attempted; otherwise, a **Cesarean Section** is indicated. * **Associated Pelvis:** Deep transverse arrest is most commonly associated with **Android** and **Platypelloid** pelvises.

Q: What is the preferred tocolytic agent for a patient with cardiac disease?

Atosiban. **Explanation:** The goal of tocolysis is to delay delivery for 48 hours to allow for corticosteroid administration. In a patient with cardiac disease, the choice of tocolytic is governed by the drug's side-effect profile, specifically its impact on hemodynamics and fluid balance. **Why Atosiban is the Correct Answer:** Atosiban is a selective **Oxytocin Receptor Antagonist (ORA)**. It works by competitively inhibiting oxytocin receptors in the myometrium. Its primary advantage is its **high organ specificity**; it has negligible effects on the cardiovascular, respiratory, or renal systems. Because it does not cause tachycardia, hypotension, or fluid retention, it is the safest and preferred tocolytic for patients with cardiac disease or those at risk of pulmonary edema. **Analysis of Incorrect Options:** * **Isoxsuprine:** A Beta-2 agonist. These are contraindicated in cardiac disease as they cause significant maternal tachycardia, palpitations, hypotension, and increase the risk of pulmonary edema. * **Nifedipine:** A Calcium Channel Blocker (CCB). While often the first-line tocolytic for healthy patients, it causes peripheral vasodilation and reflex tachycardia, which can destabilize a patient with underlying cardiac pathology. * **Magnesium Sulfate:** Primarily used for neuroprotection. As a tocolytic, it requires high doses that can cause cardiac depression and fluid overload, making it less ideal than Atosiban in cardiac cases. **High-Yield NEET-PG Pearls:** * **Drug of Choice (DOC) for Tocolysis (General):** Nifedipine (due to oral route and efficacy). * **DOC for Tocolysis in Diabetes:** Nifedipine (Beta-agonists cause hyperglycemia). * **DOC for Tocolysis in Cardiac Disease/Multiple Pregnancy:** Atosiban. * **Contraindication for Magnesium Sulfate:** Myasthenia Gravis. * **Contraindication for Indomethacin:** Gestational age >32 weeks (risk of premature closure of Ductus Arteriosus).

Q: Head delivery by flexion occurs in which presentation?

Face presentation. In normal labor (Occiput Anterior), the head is born by **extension**. However, in a **Face presentation**, the mechanism of delivery is reversed. ### **Explanation of the Correct Answer** In a face presentation, the head is already in a state of complete hyperextension. For delivery to occur, the **mentum (chin)** must rotate anteriorly to lie behind the symphysis pubis. Once the chin is pivoted under the pubic symphysis, the head is delivered by **flexion**. As the head flexes, the nose, forehead, vertex, and finally the occiput pass over the perineum. *Note: If the mentum is posterior (Mentoposterior), the head is further extended and cannot be delivered vaginally.* ### **Why Other Options are Incorrect** * **Occiput Anterior (OA):** This is the most common presentation. The head is born by **extension** as the occiput pivots under the pubic symphysis. * **Occiput Posterior (OP):** If delivered vaginally as a persistent OP, the head is born by **increased flexion** (if the forehead pivots under the symphysis) or a combination of flexion and extension. However, it is not the classic "delivery by flexion" model like face presentation. * **Brow Presentation:** This is an unstable presentation. The engaging diameter (Mentovertical, 13.5 cm) is too large for the pelvic brim. Unless it converts to a face or vertex presentation, a persistent brow presentation **cannot be delivered vaginally**. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic:** Face = Flexion (F-F). Vertex = Extension. * **Engaging Diameter in Face:** Submentobregmatic (9.5 cm). * **Prerequisite for Vaginal Delivery:** Only **Mento-anterior** positions can deliver vaginally. Mento-posterior positions result in obstructed labor. * **Common Association:** Anencephaly is a frequent cause of face presentation.

Q: A primigravida presents with 6 cm cervical dilatation and contractions occurring at a rate of 3 per 10 minutes. Which stage of labor is she in?

First stage. **Explanation:** The correct answer is **A. First stage**. Labor is clinically divided into four distinct stages based on the progression of cervical changes and the delivery of the fetus and placenta. 1. **First Stage (Stage of Cervical Dilatation):** This stage begins with the onset of true labor pains and ends with **full cervical dilatation (10 cm)**. It is further divided into the Latent phase and the Active phase. Since the patient in the question has **6 cm dilatation**, she is in the active phase of the first stage of labor. 2. **Second Stage (Stage of Expulsion):** This stage begins from full cervical dilatation (10 cm) and ends with the **delivery of the fetus**. 3. **Third Stage:** This stage begins after the delivery of the fetus and ends with the **expulsion of the placenta and membranes**. 4. **Fourth Stage:** This is the clinical observation period (usually 1–2 hours) immediately following the delivery of the placenta to monitor for postpartum hemorrhage (PPH). **High-Yield NEET-PG Pearls:** * **Friedman’s Curve:** Traditionally used to track the first stage of labor. * **Active Phase:** According to recent WHO guidelines (Labor Care Guide), the active phase of the first stage starts at **5 cm** dilatation (previously 4 cm). * **Duration:** In primigravida, the first stage lasts approximately 12 hours, while the second stage lasts about 2 hours (without epidural). * **Contractions:** Adequate labor is generally defined as 3–4 contractions every 10 minutes, each lasting 40–45 seconds.

Question 1

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 2

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 3

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 4

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

Question 5

In left oblique breech presentation, in which diameter does the head engage?

Accepted Answer

Right oblique diameter

Answer

Left oblique diameter

Answer

Right transverse diameter

Answer

Left transverse diameter

Question 6

All of the following are used for induction of labour, EXCEPT?

Accepted Answer

Prostaglandin F2 alpha tablet

Answer

Prostaglandin E1 tablet

Answer

Prostaglandin E2 gel

Answer

Misoprostol

Question 7

Deep transverse arrest is seen in which fetal head presentation?

Accepted Answer

Occipito-posterior position

Answer

Occipito-anterior position

Answer

Breech delivery

Answer

Face presentation

Question 8

What is the preferred tocolytic agent for a patient with cardiac disease?

Accepted Answer

Atosiban

Answer

Isoxsuprine

Answer

Nifedipine

Answer

Magnesium sulfate

Question 9

Head delivery by flexion occurs in which presentation?

Accepted Answer

Face presentation

Answer

Brow presentation

Answer

Occiput posterior vertex presentation

Answer

Occiput anterior vertex presentation

Question 10

A primigravida presents with 6 cm cervical dilatation and contractions occurring at a rate of 3 per 10 minutes. Which stage of labor is she in?

Accepted Answer

First stage

Answer

Second stage

Answer

Third stage

Answer

Fourth stage

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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