Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 801: Which of the following drugs should not be used in the conduct of labour in a woman with rheumatic heart disease?

A. Methylergometrine (Correct Answer)
B. Carboprost
C. Oxytocin
D. Misoprostol

Explanation: **Explanation:** In patients with Rheumatic Heart Disease (RHD), particularly those with Mitral Stenosis, the management of the third stage of labor is critical. The primary goal is to prevent sudden changes in hemodynamics and fluid overload. **Why Methylergometrine is contraindicated:** Methylergometrine (Methergine) is a potent vasoconstrictor. It causes **systemic vasoconstriction** and a sudden shift of blood from the peripheral circulation to the central compartment (autotransfusion). In a woman with RHD, this sudden increase in venous return (preload) can lead to acute pulmonary edema and heart failure. Additionally, it can cause a sharp rise in blood pressure. **Evaluation of other options:** * **Oxytocin (Option C):** This is the drug of choice for preventing Postpartum Hemorrhage (PPH) in cardiac patients. However, it must be administered as a **slow intravenous infusion**, never as a bolus, to avoid sudden hypotension. * **Carboprost (Option B):** While it can increase pulmonary artery pressure, it is not absolutely contraindicated like Methylergometrine; however, it is used with caution. * **Misoprostol (Option D):** This prostaglandin E1 analogue is safe for use in cardiac patients as it does not have significant effects on the cardiovascular system or vascular tone. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice for PPH in RHD:** Oxytocin (slow IV drip). * **Drug of Choice for PPH in Asthma:** Oxytocin or Misoprostol (Avoid Carboprost/PGF2α). * **Drug of Choice for PPH in Hypertension/Preeclampsia:** Oxytocin (Avoid Methylergometrine). * **Management Tip:** In RHD patients, the second stage of labor is often shortened by using forceps or vacuum to prevent maternal exhaustion and tachycardia.

Question 802: Placenta accreta is associated with all except:

A. Placenta previa
B. Uterine scar
C. Multiparity
D. Uterine malformation (Correct Answer)

Explanation: ### Explanation **Placenta Accreta** is a clinical condition where there is an abnormal adherence of the placenta to the underlying myometrium due to the partial or total absence of the **Nitabuch’s layer** (decidua basalis). #### Why Uterine Malformation is the Correct Answer While uterine malformations (like bicornuate or septate uterus) are associated with malpresentation, preterm labor, and retained placenta, they are **not** a primary risk factor for placenta accreta. Accreta specifically requires a defect in the decidua, usually caused by previous surgical trauma or placental implantation over a poorly vascularized area. #### Analysis of Other Options * **Placenta Previa:** This is the **most significant risk factor**. When the placenta implants in the lower uterine segment, the decidua is naturally thinner, making it easier for trophoblastic tissue to invade the myometrium. * **Uterine Scar:** Previous surgeries (Cesarean section, myomectomy, or vigorous D&C) disrupt the endometrial-myometrial interface. The risk of accreta increases proportionally with the number of prior C-sections, especially when combined with placenta previa. * **Multiparity:** High parity is a known independent risk factor. Repeated pregnancies can lead to "wear and tear" of the endometrium, predisposing to defective decidualization. #### NEET-PG High-Yield Pearls * **The "Gold Standard" Diagnosis:** Antenatal Ultrasound with Color Doppler (look for "placental lacunae" or "loss of retroplacental hypoechoic zone"). * **Classification:** 1. **Accreta:** Adheres to myometrium (80%). 2. **Increta:** Invades into myometrium (15%). 3. **Percreta:** Penetrates through the serosa; may involve the bladder (5%). * **Management:** The preferred management for a confirmed case is a planned **Cesarean Hysterectomy**. * **Risk Calculation:** In a patient with placenta previa and 3 prior C-sections, the risk of placenta accreta is approximately **40-60%**.

Question 803: Normal laborogram includes all of the following EXCEPT?

A. Cervical dilatation in X-axis (Correct Answer)
B. Descent of head in Y-axis
C. Sigmoid shaped curve
D. Ale line followed 4 hours later by action line

Explanation: In a **Partogram (Laborogram)**, the graphical representation of labor progress follows specific conventions. The correct answer is **A** because it incorrectly describes the axes. ### Why Option A is the Correct Answer (The Error) In a partogram, **Time** is always plotted on the **X-axis** (horizontal), while **Cervical Dilatation** (in cm) and **Descent of Fetal Head** (in stations/fifths) are plotted on the **Y-axis** (vertical). Reversing these axes would make the graph clinically unreadable. ### Analysis of Other Options * **B. Descent of head in Y-axis:** This is correct. Both cervical dilatation and fetal descent are measured against time on the vertical axis. * **C. Sigmoid shaped curve:** This refers to **Friedman’s Curve**. The active phase of labor typically follows a sigmoid (S-shaped) pattern, consisting of the latent phase, acceleration phase, phase of maximum slope, and deceleration phase. * **D. Alert line followed 4 hours later by action line:** This is a standard feature of the **WHO Partograph**. The Alert line starts at 4 cm dilatation; the Action line is drawn 4 hours to the right of and parallel to the alert line. If the labor curve crosses the action line, it indicates the need for intervention (e.g., augmentation or C-section). ### High-Yield Clinical Pearls for NEET-PG * **Latent Phase:** Usually lasts <20 hours in primigravida and <14 hours in multigravida. * **Active Phase:** Starts at **4 cm** (WHO) or **6 cm** (recent ACOG guidelines) dilatation. * **Rate of Dilatation:** In the active phase, the minimum expected rate is **1.2 cm/hr** for primigravida and **1.5 cm/hr** for multipara. * **Purpose:** The partogram is the best tool for the early identification of **prolonged or obstructed labor**, reducing maternal and neonatal morbidity.

Question 804: Which of the following is not a parameter in Bishop's score?

A. Cervical consistency
B. Station of head
C. Position of head (Correct Answer)
D. Cervical length

Explanation: The **Bishop Score** (also known as the Pelvic Score) is a clinical tool used to predict the likelihood of a successful vaginal delivery following the induction of labor. It assesses the "ripeness" of the cervix based on five specific physical parameters. ### Why "Position of Head" is the Correct Answer The Bishop score evaluates the **Position of the Cervix** (Posterior, Mid-position, or Anterior), not the position of the fetal head (such as Occipito-Anterior or Occipito-Posterior). While the *station* of the head is included, its rotational position is not a component of this scoring system. ### Analysis of Incorrect Options * **A. Cervical consistency:** This is a core parameter. It is graded as Firm (0), Medium (1), or Soft (2). A softer cervix is more favorable for induction. * **B. Station of head:** This measures the descent of the fetal presenting part relative to the ischial spines. It is scored from -3 (0 points) to +1/+2 (3 points). * **D. Cervical length (Effacement):** This measures the thinning of the cervix. It can be recorded as length in centimeters (0, 1-2, >2) or as a percentage of effacement. ### High-Yield Clinical Pearls for NEET-PG * **Mnemonic to remember parameters:** **"S-P-A-C-E"** (Station, Position of cervix, Apposition/Consistency, Cervical Effacement, Effacement/Dilatation). * **Interpretation:** * **Score ≥ 8:** Indicates a "ripe" cervix; the probability of a successful vaginal delivery is similar to that of spontaneous labor. * **Score ≤ 6:** Indicates an "unripe" cervix; cervical ripening agents (like PGE2/Dinoprostone) are typically required before induction. * **Modified Bishop Score:** In some clinical settings, cervical length (cm) is used instead of effacement percentage.

Question 805: Which of the following is a definite sign of the onset of labor?

A. Labor pains
B. Show
C. Dilatation of internal os
D. Formation of bag of waters (Correct Answer)

Explanation: **Explanation:** The onset of labor is a clinical diagnosis characterized by regular, painful uterine contractions that result in progressive cervical effacement and dilatation. **Why "Formation of bag of waters" is the correct answer:** The formation of the "bag of waters" (the bulging of fetal membranes through the cervix) is considered a **definite sign** of labor. As the cervix begins to dilate and the lower uterine segment stretches, the fetal membranes (amnion and chorion) detach from the decidua. The pressure of the amniotic fluid, driven by uterine contractions, pushes these membranes through the opening internal os. This physical change is a definitive indicator that the physiological process of cervical change has commenced. **Analysis of Incorrect Options:** * **Labor pains (A):** These can be deceptive. "False labor pains" (Braxton Hicks contractions) are common in late pregnancy; they are irregular, do not increase in intensity, and do not lead to cervical changes. * **Show (B):** "Show" is the discharge of a blood-stained mucus plug. While it often precedes labor by 24–48 hours, it is a premonitory sign rather than a definitive sign of active labor onset. * **Dilatation of internal os (C):** While cervical dilatation is a hallmark of labor, in multiparous women, the internal os may be dilated up to 1–2 cm in the final weeks of pregnancy without the patient being in active labor. **High-Yield NEET-PG Pearls:** * **True Labor vs. False Labor:** True labor is characterized by contractions that are regular, increase in frequency/intensity, are felt in the back and abdomen, and are **not** relieved by enema or sedatives. * **Cervical Effacement:** In primigravidae, effacement (thinning) usually precedes dilatation. In multigravidae, both occur simultaneously. * **Friedman’s Curve:** Used to monitor the progress of labor; the "Active Phase" typically begins at 4 cm (historically) or 6 cm (modern guidelines) of dilatation.

Question 806: Which drug inhibits uterine contractility and can cause pulmonary edema?

A. Ritodrine (Correct Answer)
B. Nifedipine
C. Indomethacin
D. Atosiban

Explanation: **Explanation:** **Ritodrine** is a **Beta-2 adrenergic agonist** used as a tocolytic to inhibit uterine contractions in preterm labor. It works by increasing intracellular cAMP, which leads to smooth muscle relaxation. However, its activation of beta receptors is not purely selective. The most serious side effect of beta-mimetics like Ritodrine and Terbutaline is **pulmonary edema**. This occurs due to a combination of fluid overload (increased ADH secretion and sodium/water retention), increased capillary permeability, and tachycardia-induced left ventricular dysfunction. **Analysis of Incorrect Options:** * **B. Nifedipine:** A Calcium Channel Blocker (CCB). While it is currently the first-line tocolytic due to its safety profile, its primary side effects are hypotension, flushing, and headache, not pulmonary edema. * **C. Indomethacin:** A Prostaglandin synthetase inhibitor (NSAID). It is associated with fetal side effects such as premature closure of the ductus arteriosus and oligohydramnios. * **D. Atosiban:** An Oxytocin receptor antagonist. It is highly specific to the uterus and has the fewest maternal side effects among all tocolytics. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** Nifedipine is generally the first-line tocolytic for preterm labor (32–34 weeks). * **Contraindication:** Beta-mimetics (Ritodrine) are strictly contraindicated in women with cardiac disease or uncontrolled hyperthyroidism. * **Monitoring:** When using Ritodrine, clinicians must monitor maternal heart rate, lung sounds, and blood glucose levels (as it can cause hyperglycemia and hypokalemia).

Question 807: Which of the following is a common cause for transverse lie?

A. Prolonged labor
B. Nulliparity
C. Placenta previa (Correct Answer)
D. Oligohydramnios

Explanation: **Explanation:** In a **transverse lie**, the long axis of the fetus is perpendicular to the long axis of the mother. This occurs when something prevents the fetal head or breech from engaging in the lower uterine segment. **Why Placenta Previa is Correct:** Placenta previa is a classic cause of transverse lie. When the placenta occupies the lower uterine segment, it physically obstructs the pelvic inlet. This prevents the fetal head from descending into the pelvis, forcing the fetus to assume a transverse or oblique position to accommodate the available space in the upper uterus. **Analysis of Incorrect Options:** * **Prolonged labor:** This is typically a *consequence* of a transverse lie (due to non-engagement and potential shoulder impaction), not a cause. * **Nulliparity:** In nulliparous women, the abdominal and uterine walls are usually tight, which helps maintain a longitudinal lie. **Grand multiparity** is actually the risk factor, as a lax abdominal wall allows the uterus to sag forward, shifting the fetal axis. * **Oligohydramnios:** Low amniotic fluid restricts fetal movement, often "locking" the fetus into whatever position it is already in (frequently breech). **Polyhydramnios** is the risk factor for transverse lie, as the excess fluid allows the fetus to move freely and fail to engage. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Prematurity is the most frequent association. * **Multiparity:** The most common maternal factor (due to laxity). * **Clinical Sign:** On abdominal examination, the fundal height is often less than the period of gestation, and the fundus feels "empty." * **Management:** If transverse lie persists at term (37+ weeks), a **Cesarean section** is the safest mode of delivery. Internal podalic version is now largely obsolete except in the delivery of a second twin.

Question 808: A 28-year-old female, nearing her delivery date, has been admitted following regular contractions. The resident doctor examined her and documented that the fetal head is at +1 station. Where is the exact position of the head?

A. High up in the false pelvis
B. Just above the ischial spines
C. Just below the ischial spines (Correct Answer)
D. At the perineum

Explanation: ### Explanation The concept of **Station** refers to the relationship between the leading bony part of the fetal presenting part and an imaginary line drawn between the maternal **ischial spines**. 1. **Why Option C is Correct:** The ischial spines are the narrowest part of the pelvic canal and serve as the landmark for **Station 0**. * Stations are measured in centimeters. * **Negative numbers (-1 to -5)** indicate the head is above the ischial spines. * **Positive numbers (+1 to +5)** indicate the head has descended below the ischial spines. Therefore, a **+1 station** means the fetal head is exactly **1 cm below** the level of the ischial spines. 2. **Analysis of Incorrect Options:** * **Option A (High up in the false pelvis):** This would correspond to a highly "floating" head, usually designated as Station -4 or -5. * **Option B (Just above the ischial spines):** This describes a negative station (e.g., -1 station). * **Option D (At the perineum):** This occurs when the head is at the pelvic outlet, typically corresponding to Station +4 or +5 (crowning). ### High-Yield Clinical Pearls for NEET-PG: * **Engagement:** When the widest diameter of the presenting part (biparietal diameter) passes through the pelvic inlet, the station is usually **0** (at the level of ischial spines). * **De Lee Scale:** The traditional system uses -5 to +5 centimeters. * **Internal Rotation:** This crucial movement of labor typically occurs when the fetus reaches the level of the ischial spines (Station 0) because this is where the pelvic floor muscles (levator ani) provide resistance. * **Clinical Significance:** If the station remains high despite good contractions, it may indicate **Cephalopelvic Disproportion (CPD)**.

Question 809: What is the minimum height for a primigravida woman to be considered for intervention regarding fetal growth?

A. 140 cm (Correct Answer)
B. 145 cm
C. 150 cm
D. 135 cm

Explanation: **Explanation:** In obstetrics, maternal height is a critical screening tool used to predict the risk of **Cephalopelvic Disproportion (CPD)**. A short stature is often associated with a small or contracted pelvis, which can lead to obstructed labor, especially in a primigravida where the pelvis has not been "proven" by a previous delivery. 1. **Why 140 cm is correct:** According to standard obstetric guidelines (including WHO and Park’s Preventive and Social Medicine), a height of **less than 140–145 cm** is considered a high-risk factor. Specifically, for NEET-PG purposes, **140 cm** is the established threshold below which a primigravida is categorized as "short-statured," necessitating close monitoring for fetal growth and pelvic adequacy to prevent complications like obstructed labor. 2. **Why other options are incorrect:** * **145 cm:** While some guidelines use 145 cm as a cautionary cutoff, 140 cm is the more definitive "minimum" threshold used in most standardized Indian medical examinations to trigger intervention or high-risk classification. * **150 cm:** This is considered a normal height; women of this height generally have a lower risk of contracted pelvis. * **135 cm:** While a woman of this height is certainly at risk, the screening threshold starts higher (at 140 cm) to ensure early identification of at-risk mothers. **High-Yield Clinical Pearls for NEET-PG:** * **Contracted Pelvis:** Defined when any of the essential diameters of the pelvis is reduced by 0.5 cm or more. * **CPD Assessment:** The best clinical method to assess CPD is **Muller-Munro Kerr’s method** (bimanual examination). * **Complications of Short Stature:** Increased risk of non-engagement of the fetal head, malpresentations (e.g., transverse lie), and prolonged labor. * **Management:** Short-statured primigravidae should ideally deliver in a tertiary care center where facilities for an emergency Cesarean section are available.

Question 810: Identify the option with the least risk of TOLAC (trial of labor after cesarean)?

A. Low-segment transverse incision (Correct Answer)
B. Breech presentation
C. Pre-eclampsia
D. Classical C section

Explanation: ***Low-segment transverse incision*** - This type of uterine incision is preferred during a Cesarean section as it is made in the least active segment, carrying the **lowest risk** of **uterine rupture** (approximately 0.5% to 0.9%) during a subsequent trial of labor. - It is generally considered the standard requirement for safely proceeding with a **VBAC** (Vaginal Birth After Cesarean) attempt. *Classical C section* - A **classical C-section** involves a vertical incision in the contractile upper segment (**uterine fundus**), which has the highest risk of **uterine rupture** (4% to 9%) during labor. - A history of a classical incision is generally considered an absolute **contraindication** to TOLAC. *Pre-eclampsia* - The presence of **pre-eclampsia** increases the risk of adverse outcomes to both mother and fetus, such as **placental abruption** and **intrauterine growth restriction**. - While not an absolute contraindication, it complicates management and often necessitates induction or delivery, placing it at a higher risk level compared to an uncomplicated TOLAC attempt. *Breech presentation* - **Breech presentation** is itself a risk factor for difficult vaginal delivery in nulliparous women, and combining it with a prior Cesarean scar (TOLAC) elevates the overall obstetric risk. - Many practitioners consider **breech presentation** in the current pregnancy a relative contraindication to TOLAC, favoring a planned repeat Cesarean delivery due to increased risk of complications.

Practice by Chapter

Physiology of Labor

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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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