Labor and Delivery Practice Questions

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

Defective genes. **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.

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

30 minutes. **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).

Q: True labor pain includes all of the following except:

Short vagina. 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.

Q: The following is true of Naegele's pelvis:

Absence of one ala. **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.

Q: 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?

Third degree. ### 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 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.

Q: Which of the following statements about misoprostol is true?

It is used for first-trimester abortion.. **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).

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

Extension of the incision is easy. **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.

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

4%. **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."

Question 1

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

Accepted Answer

Defective genes

Answer

Cervical incompetence

Answer

Placental and membrane abnormality

Answer

Uterine retroversion

Question 2

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

Accepted Answer

30 minutes

Answer

10 minutes

Answer

15 minutes

Answer

45 minutes

Question 3

True labor pain includes all of the following except:

Accepted Answer

Short vagina

Answer

Painful uterine contractions

Answer

Formation of the bag of waters

Answer

Progressive descent of the presenting part

Question 4

The following is true of Naegele's pelvis:

Accepted Answer

Absence of one ala

Answer

Both alae absent

Answer

Kyphotic spine

Answer

Triradiate pelvis

Question 5

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?

Accepted Answer

Third degree

Answer

First degree

Answer

Second degree

Answer

Fourth degree

Question 6

Which of the following statements about misoprostol is true?

Accepted Answer

It is used for first-trimester abortion.

Answer

It is a PGE2 analog.

Answer

It is used in the management of postpartum hemorrhage (PPH).

Answer

It is administered rectally.

Question 7

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

Accepted Answer

Extension of the incision is easy

Answer

Less blood loss

Answer

Easy repair

Answer

Muscles are not cut

Question 8

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?

Accepted Answer

All of the above

Answer

Preterm labor

Answer

Intrauterine growth restriction (IUGR)

Answer

Placental abruption

Question 9

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

Accepted Answer

Paroxysmal supraventricular tachycardia

Answer

Prematurity

Answer

Mild Hypoxia

Answer

Vagotonia

Question 10

What percentage of women deliver on their expected date of delivery?

Accepted Answer

4%

Answer

15%

Answer

35%

Answer

70%

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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