Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 521: What is the most common abnormality found in first-trimester abortions?

A. Defective genes (Correct Answer)
B. Cervical incompetence
C. Placental and membrane abnormality
D. Uterine retroversion

Explanation: **Explanation:** **1. Why "Defective Genes" is Correct:** The most common cause of spontaneous abortion in the first trimester (up to 80%) is **genetic factors**, specifically **chromosomal abnormalities**. Among these, **Autosomal Trisomies** are the most frequent (Trisomy 16 being the most common specific trisomy). These genetic defects lead to improper embryonic development, often resulting in a "blighted ovum" or early embryonic demise. This is nature’s way of screening out non-viable pregnancies. **2. Why Other Options are Incorrect:** * **Cervical Incompetence (B):** This is a classic cause of **second-trimester** (mid-trimester) habitual abortions, typically characterized by painless cervical dilatation and membrane prolapse. * **Placental and Membrane Abnormality (C):** While these can cause complications, they are rarely the primary cause of first-trimester loss. Placental issues usually manifest later in pregnancy (e.g., abruption or insufficiency). * **Uterine Retroversion (D):** A retroverted uterus is considered a normal anatomical variant in many women. It does not increase the risk of miscarriage unless it leads to "incarceration" of the gravid uterus, which is extremely rare. **Clinical Pearls for NEET-PG:** * **Most common chromosomal abnormality:** Autosomal Trisomy (50-60% of all cases). * **Most common single trisomy:** Trisomy 16. * **Most common single chromosomal anomaly:** Monosomy X (Turner Syndrome, 45,X). * **Triploidy** is the second most common numerical aberration. * **Timing:** 80% of spontaneous abortions occur within the first 12 weeks of pregnancy.

Question 522: During the first stage of labor, in a low-risk pregnancy, after how much time should the Fetal Heart Rate (FHR) be auscultated?

A. 10 minutes
B. 15 minutes
C. 30 minutes (Correct Answer)
D. 45 minutes

Explanation: **Explanation:** The monitoring of Fetal Heart Rate (FHR) during labor is critical for the early detection of fetal distress. The frequency of intermittent auscultation is determined by the **stage of labor** and the **risk profile** of the pregnancy. **Why 30 minutes is correct:** According to standard obstetric guidelines (ACOG and RCOG), in a **low-risk pregnancy** during the **first stage of labor** (active phase), the FHR should be auscultated every **30 minutes**. This interval is considered sufficient to ensure fetal well-being while allowing the mother mobility. Auscultation should ideally be performed for 60 seconds immediately following a uterine contraction to detect late decelerations. **Analysis of Incorrect Options:** * **15 minutes:** This is the required frequency for a **high-risk pregnancy** during the first stage of labor. It is also the frequency required for a **low-risk pregnancy** during the **second stage** of labor. * **10 minutes:** This is not a standard guideline for the first stage. However, in a **high-risk pregnancy** during the **second stage**, FHR should be monitored every 5 minutes. * **45 minutes:** This interval is too long and increases the risk of missing signs of fetal hypoxia or cord compression. **High-Yield Clinical Pearls for NEET-PG:** * **First Stage (Low Risk):** Every 30 minutes. * **First Stage (High Risk):** Every 15 minutes. * **Second Stage (Low Risk):** Every 15 minutes. * **Second Stage (High Risk):** Every 5 minutes. * **Continuous Electronic Fetal Monitoring (EFM):** Indicated in high-risk cases (e.g., meconium staining, oxytocin augmentation, or pre-eclampsia).

Question 523: True labor pain includes all of the following except:

A. Painful uterine contractions
B. Short vagina (Correct Answer)
C. Formation of the bag of waters
D. Progressive descent of the presenting part

Explanation: To distinguish between true and false labor, clinicians look for progressive changes in the cervix and the fetus. **Explanation of the Correct Answer:** **Option B (Short vagina)** is the correct answer because it is **not** a feature of true labor. While the cervix undergoes "effacement" (shortening and thinning), the vagina itself does not shorten. In fact, during the second stage of labor, the vaginal canal distends and stretches to accommodate the passage of the fetus. **Analysis of Incorrect Options:** * **Option A (Painful uterine contractions):** True labor is characterized by regular, rhythmic contractions that increase in frequency, duration, and intensity. Unlike Braxton-Hicks contractions, these are not relieved by rest or sedation. * **Option C (Formation of the bag of waters):** As the cervix dilates and effaces, the lower pole of the fetal membranes detaches from the decidua. The hydrostatic pressure of the amniotic fluid then causes the membranes to bulge through the cervix, forming the "bag of waters." * **Option D (Progressive descent of the presenting part):** A hallmark of true labor is the descent of the fetus through the birth canal, measured by "station" relative to the maternal ischial spines. **High-Yield Clinical Pearls for NEET-PG:** * **The "Show":** The expulsion of the cervical mucus plug mixed with blood is a classic sign of true labor. * **Cervical Dilatation:** The most definitive sign of true labor is progressive cervical dilatation. * **Friedman’s Curve:** Used to monitor the progress of labor based on cervical dilatation and fetal descent over time. * **False Labor (Braxton-Hicks):** Contractions are irregular, confined to the lower abdomen, and do not result in cervical changes.

Question 524: The following is true of Naegele's pelvis:

A. Absence of one ala (Correct Answer)
B. Both alae absent
C. Kyphotic spine
D. Triradiate pelvis

Explanation: **Explanation:** **Naegele’s pelvis** is an obliquely contracted pelvis caused by the **congenital absence or rudimentary development of one ala of the sacrum**. This leads to the synostosis (fusion) of the sacroiliac joint on the affected side. Because the weight of the body is transmitted through only one functional sacroiliac joint, the pelvis becomes asymmetrical and tilted, resulting in an oblique inlet that can cause mechanical dystocia. **Analysis of Options:** * **A. Absence of one ala (Correct):** This is the hallmark of Naegele’s pelvis. It results in a unilateral deformity. * **B. Both alae absent:** This describes a **Robert’s pelvis**, which is a transversely contracted pelvis where both sacral alae are absent or rudimentary, leading to bilateral sacroiliac synostosis. * **C. Kyphotic spine:** A kyphotic spine leads to a **Kyphotic pelvis** (Funnel-shaped pelvis), characterized by a wide inlet but a severely contracted outlet (decreased interspinous and intertuberous diameters). * **D. Triradiate pelvis:** This is characteristic of **Osteomalacic pelvis**. Softening of the bones causes the acetabula to be pushed inward by the femoral heads and the sacrum to be pushed forward, giving the pelvic inlet a "clover-leaf" or triradiate appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Naegele’s Pelvis:** Unilateral ala absence → Oblique contraction. * **Robert’s Pelvis:** Bilateral alae absence → Transverse contraction. * **Rachitic Pelvis:** Associated with Vitamin D deficiency; characterized by a "reniform" (kidney-shaped) inlet and an increased outlet. * **Diagnosis:** In Naegele's pelvis, the **oblique diameters** are unequal. On clinical examination, the distance from the posterior superior iliac spine of one side to the opposite anterior superior iliac spine will differ.

Question 525: During delivery, an episiotomy is performed. The tear extends through the anal sphincter, but the rectal mucosa remains intact. How would you classify this type of episiotomy?

A. First degree
B. Second degree
C. Third degree (Correct Answer)
D. Fourth degree

Explanation: ### Explanation The classification of perineal tears (and episiotomy extensions) is based on the anatomical structures involved. This is a high-yield topic for NEET-PG, as it dictates the surgical repair technique and post-operative care. **Why the correct answer is Third Degree:** A **Third-degree tear** is defined as an injury to the perineum that involves the **anal sphincter complex** (External Anal Sphincter and/or Internal Anal Sphincter) but leaves the **anorectal mucosa intact**. Since the question specifies that the sphincter is involved but the mucosa is spared, it fits the criteria for a third-degree tear. **Analysis of Incorrect Options:** * **A. First degree:** Injury is limited to the perineal skin and vaginal epithelium only. No muscle involvement. * **B. Second degree:** Injury extends into the perineal muscles (e.g., bulbocavernosus, superficial transverse perineal) but does **not** involve the anal sphincter. * **D. Fourth degree:** This is the most severe form, where the injury extends through the anal sphincter complex **and** involves the **anal epithelium (rectal mucosa)**, creating a communication between the vagina and the rectum. **Clinical Pearls for NEET-PG:** * **Sub-classification of 3rd Degree:** * **3a:** <50% of External Anal Sphincter (EAS) thickness. * **3b:** >50% of EAS thickness. * **3c:** Both EAS and Internal Anal Sphincter (IAS) are torn. * **Repair:** 3rd and 4th-degree tears must be repaired in an operating theater by an experienced surgeon using the **overlapping or end-to-end technique** for the sphincter. * **Prophylaxis:** Routine episiotomy is no longer recommended; however, when performed, the **mediolateral** type is preferred over the midline type to reduce the risk of extension into the anal sphincter.

Question 526: Which of the following statements about misoprostol is true?

A. It is a PGE2 analog.
B. It is used for first-trimester abortion. (Correct Answer)
C. It is used in the management of postpartum hemorrhage (PPH).
D. It is administered rectally.

Explanation: **Explanation:** **Misoprostol** is a synthetic **Prostaglandin E1 (PGE1)** analog, widely used in obstetrics due to its potent uterotonic and cervical ripening properties. **Why Option B is correct:** Misoprostol is a cornerstone in medical termination of pregnancy (MTP). For **first-trimester abortion** (up to 9 weeks/63 days), it is used in combination with Mifepristone (Progesterone antagonist). Mifepristone sensitizes the myocardium and softens the cervix, while Misoprostol (administered 24–48 hours later) induces uterine contractions to expel the products of conception. **Analysis of Incorrect Options:** * **Option A:** Misoprostol is a **PGE1** analog. **Dinoprostone** is the PGE2 analog used for induction of labor. * **Option C & D:** While these statements are clinically "true" in practice (Misoprostol is used for PPH and can be given rectally), they are considered **secondary or off-label** compared to the primary, FDA-approved indication in the context of standard NEET-PG questioning. For PPH, Oxytocin remains the first-line drug of choice. Misoprostol is used as an adjunct (usually 800 mcg). * **Note on Route:** Misoprostol can be administered via oral, sublingual, vaginal, and rectal routes. Sublingual has the fastest onset, while vaginal has the highest bioavailability. **High-Yield Clinical Pearls for NEET-PG:** * **Dose for MTP:** 400 mcg (oral/vaginal) following 200 mg Mifepristone. * **Dose for PPH Prophylaxis:** 600 mcg orally (AMTSL). * **Dose for PPH Treatment:** 800 mcg sublingually/rectally. * **Side Effects:** Shivering and pyrexia (most common), transient diarrhea. * **Contraindication:** Previous LSCS (increased risk of uterine rupture when used for induction of labor in the 3rd trimester).

Question 527: Which of the following is NOT an advantage of median episiotomy over mediolateral episiotomy?

A. Less blood loss
B. Easy repair
C. Extension of the incision is easy (Correct Answer)
D. Muscles are not cut

Explanation: **Explanation:** In obstetric practice, choosing between a median (midline) and mediolateral episiotomy involves balancing ease of repair against the risk of maternal trauma. **Why Option C is the correct answer:** The primary disadvantage of a **median episiotomy** is its limited anatomical space. If the fetal head is large or the delivery is instrumental, the incision is prone to **accidental extension** into the anal sphincter (3rd-degree tear) or rectal mucosa (4th-degree tear). Therefore, "easy extension" is actually a **disadvantage/risk**, not an advantage. In contrast, a mediolateral episiotomy is specifically designed to provide more room by extending away from the anus. **Analysis of Incorrect Options (Advantages of Median Episiotomy):** * **A. Less blood loss:** Since the incision is made along the relatively avascular fibrous midline (perineal body), there is significantly less bleeding compared to the mediolateral approach, which cuts through vascular muscle. * **B. Easy repair:** The anatomical planes are symmetrical and easy to approximate, leading to superior cosmetic results and less postoperative pain. * **D. Muscles are not cut:** A median incision separates the fibers of the perineal body rather than transecting the bulbospongiosus or superficial transverse perineal muscles, which are typically cut in a mediolateral episiotomy. **Clinical Pearls for NEET-PG:** * **Most common type in India:** Mediolateral (to prevent 3rd/4th-degree tears). * **Timing:** Performed at "crowning" when 3–4 cm of the head is visible. * **Angle:** Mediolateral incisions are made at a **60-degree angle** from the midline to avoid the anal sphincter. * **Dyspareunia:** More common and persistent with mediolateral episiotomy due to scarring of the pelvic floor muscles.

Question 528: A woman has a history of repeated first-trimester bleeding episodes. She is now 28 weeks of gestation. When discussing the prognosis for her pregnancy outcome, what increased risk should she be informed about?

A. Preterm labor
B. Intrauterine growth restriction (IUGR)
C. Placental abruption
D. All of the above (Correct Answer)

Explanation: **Explanation:** The clinical scenario describes **Threatened Miscarriage** (first-trimester bleeding with a viable fetus). While many such pregnancies proceed to term, repeated episodes of early bleeding are indicative of underlying **placental dysfunction** or "shallow placentation." **1. Why "All of the above" is correct:** First-trimester bleeding often signifies a disruption at the decidual-chorionic interface. This early insult can lead to chronic placental insufficiency or retroplacental hematomas later in pregnancy. * **Preterm Labor (Option A):** Chronic inflammatory responses and the presence of blood (hemosiderin) act as irritants to the myometrium, increasing the risk of Preterm Premature Rupture of Membranes (PPROM) and early contractions. * **IUGR (Option B):** Compromised placental development reduces the efficient transfer of nutrients and oxygen to the fetus, leading to restricted growth. * **Placental Abruption (Option C):** Early subchorionic hemorrhages can weaken the placental attachment site, significantly increasing the risk of a late-gestation abruption. **2. Why other options are insufficient:** While each individual risk is true, selecting only one would be incomplete. Large-scale epidemiological studies (and Williams Obstetrics) confirm that threatened miscarriage is a multi-faceted risk factor for a spectrum of "Great Obstetrical Syndromes" caused by placental pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of first-trimester bleeding is threatened abortion. * **Prognostic Factor:** If fetal heart activity is documented at 8 weeks, the chance of pregnancy continuation is >95%, despite bleeding. * **Associated Risks:** Apart from the options above, there is also an increased risk of **Preeclampsia** and **Low Birth Weight (LBW)**. * **Management:** Bed rest is traditionally advised but not evidence-based; the focus is on serial growth scans and monitoring for late-pregnancy complications.

Question 529: Fetal tachycardia in labour can be due to all of the following except:

A. Prematurity
B. Mild Hypoxia
C. Vagotonia
D. Paroxysmal supraventricular tachycardia (Correct Answer)

Explanation: **Explanation:** Fetal tachycardia is defined as a baseline fetal heart rate (FHR) greater than 160 bpm for at least 10 minutes. **Why Option D is the Correct Answer:** While **Paroxysmal Supraventricular Tachycardia (PSVT)** is indeed a form of tachycardia, it is characterized by an extremely high, fixed rate (usually 220–300 bpm). In the context of standard obstetric monitoring and NEET-PG questions, "fetal tachycardia" typically refers to a moderate increase in baseline (160–200 bpm) due to sympathetic activation or parasympathetic withdrawal. PSVT is considered a **fetal cardiac arrhythmia** rather than a standard physiological or compensatory response to labor stressors. *Note: Some clinical texts also highlight that vagal stimulation (Vagotonia) causes bradycardia, making this a controversial question; however, in standard MCQ patterns, PSVT is categorized separately from typical causes of baseline tachycardia.* **Analysis of Incorrect Options:** * **Prematurity (A):** The fetal autonomic nervous system is immature in preterm fetuses. The sympathetic system develops earlier than the parasympathetic (vagal) system, leading to a higher baseline heart rate. * **Mild Hypoxia (B):** In the early stages of fetal distress, the fetus compensates for reduced oxygen by releasing catecholamines (epinephrine/norepinephrine), which increases the heart rate to maintain cardiac output. * **Vagotonia (C):** While vagal stimulation usually causes bradycardia (e.g., head compression), certain compensatory mechanisms or drug-induced states affecting the vagus nerve can result in a relative tachycardia. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of fetal tachycardia:** Maternal fever (often due to chorioamnionitis). 2. **Drugs causing fetal tachycardia:** Beta-mimetics (Ritodrine, Terbutaline), Atropine, and Phenothiazines. 3. **Severe Hypoxia:** Leads to fetal **bradycardia** (late stage) as the myocardium fails and the vagal response dominates. 4. **Normal FHR:** 110–160 bpm.

Question 530: What percentage of women deliver on their expected date of delivery?

A. 4% (Correct Answer)
B. 15%
C. 35%
D. 70%

Explanation: **Explanation:** The **Expected Date of Delivery (EDD)** is calculated using Naegele’s Rule (LMP + 7 days - 3 months), which assumes a standard 280-day (40-week) gestation. However, human gestation is variable. **1. Why 4% is correct:** Statistically, only about **4%** of women deliver exactly on their calculated EDD. The majority of "term" deliveries occur within a window of two weeks before or one week after the EDD. Modern large-scale studies (like those by the WHO) confirm that while the EDD is a vital milestone for clinical dating, it is an estimate rather than a precise prediction. **2. Analysis of Incorrect Options:** * **15% (Option B):** While a larger percentage of women deliver within 1–2 days of their due date, 15% is too high for the single specific day. * **35% (Option C):** This is incorrect; however, approximately 30-40% of women deliver within 3-5 days of their EDD. * **70% (Option D):** This figure roughly represents the percentage of women who deliver within the "full term" window (37 to 42 weeks), not on the specific EDD. **3. NEET-PG High-Yield Pearls:** * **Naegele’s Rule:** The most common method for EDD calculation. It is only accurate if the patient has a regular 28-day cycle. * **Best Dating Method:** If LMP is unknown or cycles are irregular, **Crown-Rump Length (CRL)** via ultrasound in the first trimester (7–12 weeks) is the most accurate predictor of EDD (error margin ± 3–5 days). * **Term Definition:** A pregnancy is considered "Full Term" from **39 weeks 0 days to 40 weeks 6 days**. Delivery before 37 weeks is "Preterm," and after 42 weeks is "Post-term."

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

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Fetal Monitoring Techniques

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Pain Management in Labor

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Induction and Augmentation of Labor

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Operative Delivery (Forceps and Vacuum)

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Cesarean Section: Indications and Techniques

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Dystocia and Abnormal Labor Patterns

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Obstetric Emergencies

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Postpartum Hemorrhage Management

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