Labor and Delivery Practice Questions

Q: Shoulder dystocia is predominantly seen in which of the following conditions?

Anencephaly. **Explanation:** The correct answer is **Anencephaly**. **Why Anencephaly?** In a normal delivery, the head is the largest part of the fetus. Once the head is born, it dilates the birth canal sufficiently for the shoulders to follow. In **anencephaly**, there is a developmental absence of the cranial vault and brain tissue. Consequently, the head is small and underdeveloped (rudimentary), failing to adequately dilate the cervix and maternal soft tissues. When the broad, well-developed shoulders reach the pelvic inlet, they encounter an undilated birth canal, leading to **shoulder dystocia**. This is a classic "high-yield" paradox where a smaller head leads to more difficult shoulder delivery. **Analysis of Incorrect Options:** * **A. Transverse lie:** This is a malpresentation where the long axis of the fetus is perpendicular to the mother. Delivery is impossible vaginally; therefore, shoulder dystocia (a complication of vaginal delivery) is not the primary concern here. * **B. Hand prolapse:** This often occurs with transverse lie or compound presentation. While it complicates labor, it does not inherently cause the mechanical bony impaction of the shoulders against the pubic symphysis. * **D. Cord around neck:** A nuchal cord may cause fetal distress or failure to descend, but it does not change the diameter of the shoulders or the dilation of the birth canal. **Clinical Pearls for NEET-PG:** * **Definition:** Shoulder dystocia is the failure of the shoulders to deliver after the head, requiring additional maneuvers. * **Most common cause:** Fetal macrosomia (often associated with maternal diabetes). * **The Anencephaly Paradox:** Small head → inadequate cervical/vaginal dilation → shoulder impaction. * **Management:** Remember the **HELPERR** mnemonic (H-Call for Help, E-Episiotomy, L-Legs/McRoberts, P-Suprapubic Pressure, E-Enter/Internal rotation, R-Remove posterior arm, R-Roll the patient).

Q: What percentage of occipitoposterior positions spontaneously convert to the occipitoanterior position and deliver comfortably?

75-80%. **Explanation:** The **Occipitoposterior (OP)** position is the most common malposition encountered during labor. While it occurs in approximately 15–25% of cases at the onset of labor, the majority of these cases undergo **spontaneous long internal rotation** (135°) to the Occipitoanterior (OA) position. **1. Why 75-80% is correct:** During the second stage of labor, as the fetal head reaches the pelvic floor, the resistance of the levator ani muscles promotes rotation. In approximately **75-80%** of cases, the occiput rotates anteriorly to the OA position, leading to a normal vaginal delivery. This is the natural mechanism of labor for OP positions. **2. Why the other options are incorrect:** * **A (3-4%):** This represents the incidence of **Persistent Occipitoposterior (POP)** position—where the head fails to rotate and remains OP at the time of delivery. * **B (15-16%):** This is closer to the initial incidence of OP position at the *onset* of labor, but it does not account for the high rate of subsequent rotation. * **C (20-25%):** This range often describes the incidence of OP in early labor or the percentage of cases that may require operative intervention (vacuum/forceps/CS) due to failure of rotation. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Rotation occurs through a **long arc of 135°** (compared to 45° in OA). * **Clinical Sign:** On per-vaginal exam, the **anterior fontanelle** (diamond-shaped) is felt behind the symphysis pubis, and the **sagittal suture** is in the oblique diameter. * **Complications:** If rotation fails, it may result in **Deep Transverse Arrest** (rotation stops at 90°) or **Persistent OP** (Face-to-Pubis delivery). * **Management:** If the pelvis is adequate and the head is low, a "Face-to-Pubis" delivery is possible, though it results in a larger diameter (11.5 cm) distending the perineum, increasing the risk of 3rd-degree tears.

Q: In complete breech presentation, what is the typical fetal attitude maintained?

Universal flexion. In a **Complete Breech** (also known as Flexed Breech), the fetus maintains the **Universal Flexion** attitude, which is the normal physiological posture of the fetus in utero. ### Why Option A is Correct In a complete breech, the fetal attitude is characterized by: * **Flexion at the hip joints.** * **Flexion at the knee joints.** This results in the buttocks and the feet both presenting at the internal os. This is most commonly seen in multiparous women. ### Why Other Options are Incorrect * **Option B (Universal extension):** This is not a standard fetal attitude. Extension of the head occurs in face presentations, but universal extension is incompatible with normal vaginal delivery. * **Option C (Flexion at hip, extension at knee):** This describes a **Frank Breech**. This is the most common type of breech presentation (especially in primigravidae) where the legs are extended against the trunk and the feet lie near the face. * **Option D (Extension of hip, flexion of knee):** This describes a **Footling Breech**, where one or both hips are extended, and the foot (or feet) is the presenting part below the level of the buttocks. ### High-Yield NEET-PG Pearls * **Most common breech:** Frank Breech (especially at term). * **Best prognosis for vaginal delivery:** Frank Breech (the buttocks act as a good dilating wedge). * **Highest risk of Cord Prolapse:** Footling Breech (due to the irregular presenting part not filling the lower uterine segment). * **Prerequisite for Breech:** The "Bitrochanteric diameter" (10 cm) is the engaging diameter in breech presentation. * **Management:** External Cephalic Version (ECV) is typically offered at 36 weeks in primigravidae and 37 weeks in multiparae.

Q: Which of the following is a mechanical method of cervical induction?

Transcervical Foley's catheter. ### Explanation Cervical ripening and induction of labor are categorized into two main modalities: **Pharmacological (Chemical)** and **Mechanical** methods. **Why the Correct Answer is Right:** **D. Transcervical Foley’s catheter** is a mechanical method. It works through two primary mechanisms: 1. **Direct Pressure:** The inflated balloon (usually 30–60 mL) applies direct mechanical pressure on the internal os, stretching the lower uterine segment. 2. **Endogenous Prostaglandin Release:** The placement causes physical separation of the chorioamniotic membranes from the decidua, triggering the local release of endogenous prostaglandins (PGE2 and PGF2α), which softens the cervix. **Why the Other Options are Wrong:** * **A & B (PGE1 - Misoprostol):** Misoprostol is a synthetic prostaglandin E1 analogue. Whether administered **orally** or **vaginally**, it is a **pharmacological** method. It is highly effective but carries a higher risk of uterine tachysystole compared to mechanical methods. * **C (PGE2 - Dinoprostone):** Dinoprostone (available as gels or inserts) is the gold standard **pharmacological** agent for cervical ripening. Like PGE1, it acts chemically to break down collagen in the cervix. **High-Yield Clinical Pearls for NEET-PG:** * **Safety Profile:** Mechanical methods (Foley’s) have a **lower risk of uterine tachysystole** and FHR abnormalities compared to prostaglandins, making them the preferred choice in women with a **previous cesarean section** (where prostaglandins are contraindicated due to rupture risk). * **Bishop Score:** Induction is typically indicated when the Bishop score is **≤6**. * **Other Mechanical Methods:** Include extra-amniotic saline infusion (EASI), membrane stripping, and hygroscopic dilators (Laminaria tents). * **Combined Method:** Using a Foley catheter plus Oxytocin is often faster than using either alone.

Q: Which of the following clinical findings is NOT suggestive of an adequate pelvis for vaginal delivery?

Interspinous diameter > 8 cm. In clinical pelvimetry, assessing the pelvic diameters is crucial to predict the feasibility of a vaginal delivery. **Explanation of the Correct Answer:** The **interspinous diameter** is the narrowest transverse diameter of the pelvic mid-cavity (the distance between the two ischial spines). For a pelvis to be considered adequate for a vaginal delivery, the interspinous diameter should be **at least 10 cm**. A value of 8 cm is significantly narrowed and is highly suggestive of mid-pelvic contraction, which can lead to deep transverse arrest of the fetal head. Therefore, Option B is the correct answer as it does not represent an adequate pelvis. **Analysis of Incorrect Options:** * **Diagonal Conjugate (Option A):** Measured during per-vaginal examination, it should be **> 11.5 cm**. Subtracting 1.5–2 cm from this gives the Obstetric Conjugate (the shortest AP diameter of the inlet), which should be > 10 cm. * **Sacrosciatic Notch (Option C):** A width of **2.5 to 3 finger breadths** indicates a wide, well-curved notch, characteristic of a Gynecoid pelvis. A narrow notch suggests an Android (male-type) pelvis. * **Bituberous Diameter (Option D):** This represents the transverse diameter of the pelvic outlet. A measurement **> 8 cm** (or the ability to place a closed fist between the ischial tuberosities) indicates an adequate outlet. **High-Yield Clinical Pearls for NEET-PG:** * **Gynecoid Pelvis:** The most common (50%) and ideal for delivery; features a rounded inlet and wide sub-pubic angle (> 90°). * **Platypelloid Pelvis:** Kidney-shaped inlet; increased risk of persistent transverse position. * **Android Pelvis:** Heart-shaped inlet; associated with occipito-posterior positions and "funneling" of the pelvis. * **Anthropoid Pelvis:** Oval inlet (AP diameter > Transverse); common in non-white races.

Q: Risk factors for poor progress of labour include the following, EXCEPT:

Meconium stained amniotic fluid. **Explanation:** The progress of labor is determined by the "3 Ps": **Power** (uterine contractions), **Passenger** (fetal size and position), and **Passage** (maternal pelvis). Any abnormality in these factors leads to dystocia or poor progress. **Why Meconium-Stained Amniotic Fluid (MSAF) is the correct answer:** MSAF is a sign of potential **fetal distress** or maturity of the fetal gastrointestinal tract; it is an indicator of fetal well-being rather than a mechanical factor affecting labor progression. While MSAF requires close monitoring, it does not inherently slow down the cervical dilatation or fetal descent. **Analysis of Incorrect Options (Risk Factors for Poor Progress):** * **Malpresentation (C) and Big Baby (D):** These represent "Passenger" issues. A large fetus (macrosomia) or abnormal presentation (e.g., occipitoposterior, brow, or face presentation) creates a mechanical mismatch between the fetus and the birth canal, leading to protracted labor or arrest. * **Premature Rupture of Membranes (B):** PROM can lead to poor progress due to the loss of the "hydrostatic wedge" effect of the intact amniotic sac, which normally aids in uniform cervical effacement and dilatation. Furthermore, it is often associated with uterine inertia or chorioamnionitis, both of which can impair effective contractions. **High-Yield Clinical Pearls for NEET-PG:** * **Friedman’s Curve:** Used to track labor progress. The most common cause of a prolonged latent phase is an unripe cervix or excessive sedation. * **Active Phase Arrest:** Defined as no cervical change for $\geq$ 4 hours with adequate contractions or $\geq$ 6 hours with inadequate contractions. * **Protraction Disorders:** Often caused by **Cephalopelvic Disproportion (CPD)**; always rule out CPD before starting Oxytocin.

Q: What is the definition of a prolonged latent phase in a nullipara?

20 hours. **Explanation:** The **latent phase** of labor is the period from the onset of regular uterine contractions until the beginning of the active phase (usually defined as 4–6 cm cervical dilation). According to **Friedman’s criteria**, which remain a high-yield standard for NEET-PG, a prolonged latent phase is defined based on the parity of the patient: * **Nullipara:** >20 hours * **Multipara:** >14 hours **Why Option D is Correct:** In a nulliparous woman (first-time mother), the cervix requires more time for effacement and early dilation. A duration exceeding **20 hours** is statistically outside the 95th percentile and is classified as "prolonged." **Analysis of Incorrect Options:** * **Option A (10 hours):** This is within the normal range for both nulliparae and multiparae. * **Option B (14 hours):** This is the threshold for a prolonged latent phase in a **multipara**. * **Option C (18 hours):** While approaching the limit, it does not meet the formal diagnostic criteria for a nullipara. **NEET-PG High-Yield Pearls:** 1. **Management:** The preferred management for a prolonged latent phase is **therapeutic rest** (e.g., morphine) or **oxytocin augmentation**. It is *not* an indication for an immediate Cesarean section. 2. **Friedman’s Curve vs. WHO:** While Friedman defined the active phase starting at 3–4 cm, the **WHO Labor Care Guide** now suggests the active phase starts at **5 cm**. However, for exam purposes regarding "prolonged latent phase" definitions, Friedman’s 20/14 hour rule is the standard. 3. **Most Common Cause:** The most common cause of a prolonged latent phase is "unripe cervix" or excessive early sedation.

Question 1

Which of the following is true regarding a fetus in transverse presentation?

Accepted Answer

Polyhydramnios is a cause

Answer

It can be caused by abruptio placenta

Answer

It results in hand prolapse in all cases

Answer

Shoulder dystocia is a major threat

Question 2

Shoulder dystocia is predominantly seen in which of the following conditions?

Accepted Answer

Anencephaly

Answer

Transverse lie

Answer

Hand prolapse

Answer

Cord around neck

Question 3

What percentage of occipitoposterior positions spontaneously convert to the occipitoanterior position and deliver comfortably?

Accepted Answer

75-80%

Answer

3-4%

Answer

15-16%

Answer

20-25%

Question 4

In complete breech presentation, what is the typical fetal attitude maintained?

Accepted Answer

Universal flexion

Answer

Universal extension

Answer

Flexion at the hip and extension at the knee

Answer

Extension of the hip and flexion of the knee

Question 5

Which of the following correctly defines Montevideo units for measurement of uterine activity?

Accepted Answer

Uterine pressure (mm of Hg) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (mm of water) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (cm of water) multiplied by the number of contractions in 10 minutes.

Answer

Uterine pressure (cm of H2O) multiplied by the number of contractions in 20 minutes.

Question 6

Which of the following is a mechanical method of cervical induction?

Accepted Answer

Transcervical Foley's catheter

Answer

PGE1 Oral Induction

Answer

PGE1 Vaginal induction

Answer

PGE2 vaginal Induction

Question 7

Which one of the following is not a risk factor for Postpartum Hemorrhage (PPH)?

Accepted Answer

Small for date baby

Answer

Anemia

Answer

Grandmultipara

Answer

Antepartum Hemorrhage (APH)

Question 8

Which of the following clinical findings is NOT suggestive of an adequate pelvis for vaginal delivery?

Accepted Answer

Interspinous diameter > 8 cm

Answer

Diagonal conjugate > 11.5 cm

Answer

Sacrosciatic notch 2.5-3 finger breadths

Answer

Bituberous diameter > 8 cm

Question 9

Risk factors for poor progress of labour include the following, EXCEPT:

Accepted Answer

Meconium stained amniotic fluid

Answer

Premature rupture of membranes

Answer

Malpresentation

Answer

Big baby

Question 10

What is the definition of a prolonged latent phase in a nullipara?

Accepted Answer

20 hours

Answer

10 hours

Answer

14 hours

Answer

18 hours

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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