Labor and Delivery Practice Questions

Q: Which of the following is seen in the 2nd stage of labor?

All of the above. The **Second Stage of Labor** begins with the full dilatation of the cervix (10 cm) and ends with the expulsion of the fetus. **Explanation of the Correct Answer:** * **Expulsion of the fetus (Option A):** This is the defining clinical outcome of the second stage. It involves the descent and delivery of the baby through the birth canal via the "Mechanism of Labor." * **Increase in contraction (Option B):** During this stage, uterine contractions become stronger, longer (lasting 60–90 seconds), and more frequent (2–3 minutes apart). Additionally, the secondary powers (maternal bearing-down efforts or "Valsalva maneuver") are recruited, significantly increasing intra-abdominal pressure. * **Cervical dilatation (Option C):** While the *process* of dilatation occurs primarily in the first stage, the second stage begins only once **full cervical dilatation** is achieved. In clinical practice, the transition to the second stage is confirmed when the cervix is no longer palpable. Since all these physiological and clinical events characterize the second stage, **Option D** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** * **Duration:** In primigravida, it lasts ~2 hours (3 with epidural); in multigravida, ~1 hour (2 with epidural). * **Signs of 2nd Stage:** Pushing reflex (Ferguson’s reflex), bulging of the perineum, and "crowning" of the head. * **Management:** The "Active Management of Second Stage" involves monitoring fetal heart rate every 5 minutes or after every contraction. * **Episiotomy:** If required, it is performed during this stage when the perineum is thinned out and the head is crowning.

Q: What is the commonest type of fetal presentation during labor?

Vertex. **Explanation:** The correct answer is **Vertex**. In obstetrics, **presentation** refers to the part of the fetus that lies over the pelvic inlet. **Why Vertex is Correct:** Cephalic (head-first) presentation occurs in approximately **96-97%** of all term pregnancies. Within cephalic presentations, the **Vertex** is the most common. It occurs when the fetal head is well-flexed, bringing the suboccipitobregmatic diameter (9.5 cm) to the pelvic inlet. This is the most favorable position for a vaginal delivery because it presents the smallest diameter of the fetal head to the maternal pelvis. **Analysis of Incorrect Options:** * **A. Breech:** This is a longitudinal lie where the buttocks or feet present first. It occurs in only about **3-4%** of term pregnancies, though it is more common in preterm labor. * **B. Shoulder:** This occurs in a **transverse lie**. It is rare (less than 0.5% at term) and is an absolute indication for a Cesarean section if the fetus is viable and the lie does not stabilize. * **C. Brow:** This occurs when the fetal head is partially extended. It is an unstable presentation and usually converts to either a vertex or a face presentation. It is rare, occurring in about 1 in 1400 deliveries. **Clinical Pearls for NEET-PG:** * **Denominator:** The landmark used to describe the position. For Vertex, it is the **Occiput**; for Breech, it is the **Sacrum**; for Face, it is the **Mentum**. * **Most common position:** Left Occipito-Anterior (LOA) is traditionally considered the most common, though many modern studies suggest Occipito-Transverse (OT) is the most frequent initial position at the onset of labor. * **Malpresentation vs. Malposition:** Breech/Shoulder are *malpresentations*, while Persistent Occipito-Posterior (OP) is a *malposition*.

Q: Abortion in the second trimester is mostly due to:

Incompetent cervix. **Explanation:** The majority of spontaneous abortions (miscarriages) occur in the first trimester, primarily due to chromosomal abnormalities. However, once a pregnancy reaches the **second trimester (13–28 weeks)**, the etiology shifts from genetic factors to anatomical and maternal factors. **1. Why "Incompetent Cervix" is correct:** Cervical insufficiency (incompetent cervix) is the most common cause of mid-trimester pregnancy loss. It is characterized by the painless dilation of the cervix, leading to the prolapse of membranes and subsequent expulsion of a premature but often morphologically normal fetus. This occurs because the cervix fails to remain closed against the increasing intrauterine pressure as the fetus grows. **2. Analysis of Incorrect Options:** * **Defective Genes (Chromosomal Abnormalities):** This is the leading cause of **first-trimester** abortions (approx. 50–60%). While they can cause second-trimester loss, their frequency decreases significantly as the pregnancy advances. * **Tuberculosis:** While genital TB is a major cause of primary and secondary infertility (due to tubal blockage or endometrial scarring), it is a rare cause of spontaneous abortion compared to anatomical defects. * **Trauma:** Though a common concern for patients, physical trauma is rarely the cause of abortion unless it is severe enough to cause placental abruption or direct uterine injury. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Transvaginal Ultrasound (TVS) showing a cervical length **<25 mm** or "funneling" of the internal os before 24 weeks. * **Treatment:** Cervical Cerclage (e.g., **McDonald’s or Shirodkar’s procedure**), typically performed between 14–18 weeks of gestation. * **Classic History:** Repeated, painless, mid-trimester abortions preceded by spontaneous rupture of membranes.

Q: The classic triad of ruptured ectopic pregnancy includes all except?

Fainting. **Explanation:** In Obstetrics and Gynecology, the **classic clinical triad** of a ruptured ectopic pregnancy consists of: 1. **Abdominal pain** (most common symptom, present in 95–100% of cases). 2. **Amenorrhea** (history of a missed period, present in 75–95% of cases). 3. **Vaginal bleeding** (usually spotting or slight bleeding, present in 60–80% of cases). **Why "Fainting" is the correct answer:** While fainting (syncope) is a significant clinical sign of a ruptured ectopic pregnancy due to internal hemorrhage and hypovolemic shock, it is **not** part of the formal "classic triad." Fainting is considered a symptom of hemodynamic instability rather than a diagnostic component of the primary triad. **Analysis of Incorrect Options:** * **Abdominal Pain:** This is the hallmark symptom. It is usually sudden, severe, and localized to the iliac fossa initially, later becoming generalized due to hemoperitoneum. * **History of Amenorrhea:** Most patients have a period of 6–8 weeks of amenorrhea before rupture occurs. * **Vaginal Bleeding:** This occurs due to the breakdown of the decidua as the pregnancy fails. It is typically dark brown and scanty. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Transvaginal Ultrasound (TVS) + Serum β-hCG. * **Arias-Stella Reaction:** A characteristic histological change in the endometrium (hypersecretory glands) seen in ectopic pregnancy, though not pathognomonic. * **Most Common Site:** The **Ampulla** of the Fallopian tube. * **Most Common Site for Rupture:** The **Isthmus** (ruptures early, at 6–8 weeks) or **Interstitial** portion (ruptures late, at 12–14 weeks, often causing massive hemorrhage).

Q: Most common nerve injured during normal vaginal delivery is?

Lateral femoral cutaneous nerve. **Explanation:** The **Lateral Femoral Cutaneous Nerve (LFCN)** is the most common nerve injured during normal vaginal delivery. This injury typically occurs due to prolonged positioning in the **lithotomy position**. The nerve (derived from L2-L3) passes under the inguinal ligament; extreme flexion, abduction, and external rotation of the thighs can cause the inguinal ligament to compress the nerve against the pelvic brim. This leads to **Meralgia Paresthetica**, characterized by numbness, tingling, or burning pain along the anterolateral aspect of the thigh, without motor deficit. **Analysis of Incorrect Options:** * **Femoral Nerve:** While it can be injured during vaginal delivery due to hyperflexion of the hips (compression under the inguinal ligament), it is less common than LFCN injury. It presents with loss of knee extension and a diminished patellar reflex. * **Iliohypogastric & Ilioinguinal Nerves:** These are more commonly injured during **Lower Segment Cesarean Section (LSCS)** or other pelvic surgeries involving transverse incisions (like the Pfannenstiel incision), rather than during a normal vaginal delivery. **Clinical Pearls for NEET-PG:** * **Most common nerve injured in LSCS:** Iliohypogastric or Ilioinguinal nerve. * **Most common nerve injured by Forceps application:** Obturator nerve (leads to difficulty in adduction of the thigh). * **Peroneal Nerve injury:** Occurs due to direct pressure on the neck of the fibula by lithotomy stirrups, leading to **foot drop**. * **Key Distinguisher:** LFCN injury is purely **sensory**; if motor weakness is present, consider Femoral or Obturator nerve involvement.

Q: Which is the most important diameter of the pelvis during labor?

Interspinous diameter of the outlet. The **interspinous diameter** is considered the most important diameter of the pelvis during labor because it represents the **narrowest part of the entire birth canal**. ### Explanation of the Correct Answer The interspinous diameter is the distance between the two ischial spines (normally measuring **10.5 cm**). It marks the plane of the **mid-pelvis**, which is the site of the least pelvic dimensions. If the fetal head can successfully pass through this diameter, it is highly likely that the rest of the delivery will proceed without bony obstruction. It is also the landmark used to determine the **station** of the fetal head (Station 0). ### Why Other Options are Incorrect * **Oblique diameter of the inlet (12 cm):** While important for the initial engagement of the fetal head, the inlet is generally wider than the mid-pelvis. Most cases of cephalopelvic disproportion (CPD) occur at the mid-pelvis or outlet rather than a roomy inlet. * **Anteroposterior diameter of the outlet (11.5 cm):** This diameter extends from the lower border of the symphysis pubis to the tip of the coccyx. Because the coccyx is mobile and can deflect posteriorly during labor, this diameter rarely poses a significant obstruction. * **Intertubercular diameter (11 cm):** This is the transverse diameter of the pelvic outlet. While it is a limiting factor, the interspinous diameter is narrower and reached earlier in the descent, making it the more critical clinical bottleneck. ### High-Yield Clinical Pearls for NEET-PG * **Narrowest Diameter:** Interspinous diameter (10.5 cm). * **Shortest AP Diameter of Inlet:** Obstetric conjugate (10 cm) – calculated by subtracting 1.5–2 cm from the Diagonal Conjugate. * **Diagonal Conjugate:** The only AP diameter that can be measured clinically via per-vaginal examination. * **Mid-pelvis Contraction:** Suspected if the ischial spines are prominent or the interspinous diameter is <10 cm.

Question 1

Which of the following measures can help prevent perineal injury during normal labor?

Accepted Answer

Performing episiotomy routinely

Answer

Maintaining flexion of the fetal head

Answer

Ensuring slow delivery of the fetal head between contractions

Answer

Providing effective perineal support/guarding

Question 2

Which of the following is seen in the 2nd stage of labor?

Accepted Answer

All of the above

Answer

Expulsion of the fetus

Answer

Increase in contraction

Answer

Cervical dilatation

Question 3

On external cephalic version, fetal bradycardia occurred. What is the recommended next course of action?

Accepted Answer

Revert to the original position immediately by external version

Answer

Perform internal podalic version

Answer

Proceed with cesarean section

Answer

Rupture of membranes

Question 4

Maximum chances of amniotic fluid embolism is seen at?

Accepted Answer

Labor

Answer

First trimester

Answer

Second trimester

Answer

Postpartum

Question 5

Which of the following is not a contraindication for trial of labour?

Accepted Answer

Multigravida

Answer

Malpresentation

Answer

Rachitic pelvis

Answer

Previous LSCS

Question 6

What is the commonest type of fetal presentation during labor?

Accepted Answer

Vertex

Answer

Breech

Answer

Shoulder

Answer

Brow

Question 7

Abortion in the second trimester is mostly due to:

Accepted Answer

Incompetent cervix

Answer

Defective genes

Answer

Tuberculosis

Answer

Trauma

Question 8

The classic triad of ruptured ectopic pregnancy includes all except?

Accepted Answer

Fainting

Answer

Abdominal pain

Answer

History of amenorrhea

Answer

Vaginal bleeding

Question 9

Most common nerve injured during normal vaginal delivery is?

Accepted Answer

Lateral femoral cutaneous nerve

Answer

Femoral nerve

Answer

Iliohypogastric nerve

Answer

Ilioinguinal nerve

Question 10

Which is the most important diameter of the pelvis during labor?

Accepted Answer

Interspinous diameter of the outlet

Answer

Oblique diameter of the inlet

Answer

Anteroposterior diameter of the outlet

Answer

Intertubercular diameter

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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