Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 511: A 32-week pregnant woman presents with mild uterine contractions. On examination, her vital signs are stable, and placenta previa type III is present. What is the best management?

A. Bed rest and Dexamethasone
B. Bed rest, Nifedipine, and Dexamethasone (Correct Answer)
C. Bed rest and Sedation
D. Immediate caesarean section

Explanation: **Explanation:** The management of Placenta Previa depends on the gestational age, the severity of bleeding, and the maternal/fetal status. This patient is at **32 weeks (preterm)** with **mild contractions** and stable vitals, indicating a candidate for **Expectant Management (Macafee-Johnson Regime)**. 1. **Why Option B is Correct:** * **Bed Rest:** Essential to reduce pressure on the lower uterine segment and minimize bleeding. * **Nifedipine (Tocolysis):** The patient is experiencing contractions. Tocolytics are used to arrest preterm labor, providing a window (48 hours) for steroid action. * **Dexamethasone (Corticosteroids):** Crucial at 32 weeks to promote fetal lung maturity and reduce the risk of Respiratory Distress Syndrome (RDS), Intraventricular Hemorrhage, and Necrotizing Enterocolitis. 2. **Why Other Options are Incorrect:** * **Option A:** Lacks the tocolytic (Nifedipine) needed to stop the contractions that could lead to further placental separation. * **Option C:** Sedation may provide rest but does not address fetal lung maturity or the physiological process of preterm labor. * **Option D:** Immediate C-section is reserved for patients with heavy, life-threatening hemorrhage, fetal distress, or those who have reached 37 weeks. At 32 weeks with stable vitals, the goal is to prolong the pregnancy. **Clinical Pearls for NEET-PG:** * **Macafee-Johnson Regime:** Aimed at carrying the pregnancy to **37 weeks** to avoid prematurity. * **Contraindication:** Digital vaginal examination is strictly contraindicated in suspected placenta previa as it can provoke torrential hemorrhage. * **Type III/IV Previa:** Always requires a Cesarean Section for delivery. * **Tocolytic of Choice:** Nifedipine is preferred over Beta-mimetics (like Ritodrine) in previa because Beta-mimetics cause tachycardia, which can mask signs of hypovolemic shock.

Question 512: Risk factors for poor progress of labour include the following, EXCEPT:

A. Meconium stained amniotic fluid (Correct Answer)
B. Premature rupture of membranes
C. Malpresentation
D. Big baby

Explanation: **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.

Question 513: What is the definition of a prolonged latent phase in a nullipara?

A. 10 hours
B. 14 hours
C. 18 hours
D. 20 hours (Correct Answer)

Explanation: **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 514: What is the most common cause of maternal mortality?

A. Postpartum hemorrhage (Correct Answer)
B. Eclampsia
C. Abortion
D. Infection

Explanation: **Explanation:** **Postpartum Hemorrhage (PPH)** is the leading cause of maternal mortality worldwide and in India, accounting for approximately 25-30% of all maternal deaths. The underlying medical concept is the rapid loss of blood following delivery, most commonly due to **uterine atony** (failure of the uterus to contract effectively), which prevents the compression of intramyometrial blood vessels. Because the pregnant uterus receives a high volume of blood flow (approx. 600-800 ml/min), uncontrolled bleeding can lead to hypovolemic shock and death within hours if not managed aggressively. **Analysis of Incorrect Options:** * **B. Eclampsia:** While a major cause of maternal morbidity and mortality, it ranks second or third globally. It involves seizures resulting from severe pre-eclampsia. * **C. Abortion:** Unsafe abortions contribute significantly to maternal mortality (especially in developing regions), but they do not surpass PPH in total frequency. * **D. Infection (Sepsis):** Puerperal sepsis is a leading cause of "preventable" death, but with the advent of modern antibiotics, its contribution to the total mortality rate is lower than that of hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of PPH:** Uterine Atony (70% of cases). * **Definition of PPH:** Blood loss >500 ml in vaginal delivery or >1000 ml in Cesarean section. * **Active Management of Third Stage of Labor (AMTSL):** The most important intervention to prevent PPH; the drug of choice is **Oxytocin** (10 IU IM/IV). * **Maternal Mortality Ratio (MMR):** Defined as the number of maternal deaths per 100,000 live births.

Question 515: What is true regarding hypotonic dysfunction of labor?

A. Most commonly associated with occipitoposterior position (Correct Answer)
B. Oxytocin administration is beneficial with occipitoposterior position
C. Occurs in the first stage of labor
D. Leads to rapid dilatation of the cervix

Explanation: **Explanation:** **Hypotonic Uterine Dysfunction** is a condition where uterine contractions become infrequent, weak, or of short duration (less than 25 mmHg intensity) during the active phase of labor. 1. **Why Option A is Correct:** Hypotonic dysfunction is most frequently associated with **malpositions**, particularly the **Occipitoposterior (OP) position**. In OP positions, the fetal head does not fit the cervix as snugly as in occipitoanterior positions. This lack of uniform pressure on the cervix leads to a poor Ferguson reflex (the neuroendocrine reflex where cervical stretching triggers oxytocin release), resulting in weak, ineffective contractions. 2. **Why the other options are incorrect:** * **Option B:** While oxytocin is the treatment of choice for hypotonic labor in normal positions, it is often **ineffective or contraindicated** if the underlying cause is a persistent malposition or cephalopelvic disproportion (CPD). In OP positions, aggressive oxytocin can lead to uterine rupture or fetal distress if the head cannot rotate. * **Option C:** Hypotonic dysfunction typically occurs during the **Active Phase of the First Stage** or the **Second Stage** of labor. If it occurs before the active phase, it is usually classified as a prolonged latent phase. * **Option D:** By definition, hypotonic labor leads to **arrest or protraction** of cervical dilatation, not rapid dilatation (which is seen in precipitate labor). **High-Yield NEET-PG Pearls:** * **Hypertonic vs. Hypotonic:** Hypertonic dysfunction (colicky uterus) occurs in the **latent phase** and is treated with rest/morphine; Hypotonic occurs in the **active phase** and is treated with oxytocin/ARM. * **Friedman’s Curve:** Hypotonic labor is the primary cause of "Secondary Arrest of Dilatation." * **Diagnosis:** Internal pressure catheter showing <180 Montevideo Units (MVU).

Question 516: What is the normal value of fetal scalp pH?

A. 6.9
B. 7.0
C. 7.1
D. 7.3 (Correct Answer)

Explanation: **Explanation:** Fetal scalp blood sampling (FBS) is a diagnostic tool used to assess fetal acid-base status when electronic fetal monitoring (CTG) shows non-reassuring patterns. The pH of fetal blood is slightly more acidic than maternal blood but remains within a specific physiological range during normal labor. **1. Why Option D is Correct:** The normal fetal scalp pH is **7.25 to 7.35**. Therefore, **7.3** represents a normal, reassuring value indicating that the fetus is well-oxygenated and not in respiratory or metabolic distress. **2. Analysis of Incorrect Options:** * **Option A (6.9) & B (7.0):** These values indicate **severe pathological acidemia**. A pH below 7.0 is associated with an increased risk of neonatal encephalopathy and long-term neurological deficits. Immediate delivery is mandatory. * **Option C (7.1):** This value indicates **acidosis**. In clinical practice, a pH **< 7.20** is considered abnormal (acidotic) and usually necessitates immediate intervention or delivery. **3. High-Yield Clinical Pearls for NEET-PG:** * **Interpretation Ranges:** * **Normal:** > 7.25 (Repeat if CTG remains abnormal). * **Borderline (Pre-acidotic):** 7.20 – 7.25 (Repeat sampling within 30–60 minutes). * **Abnormal (Acidotic):** < 7.20 (Indication for immediate delivery). * **Contraindications for FBS:** Maternal infection (HIV, Hepatitis, Herpes), fetal bleeding disorders (e.g., Hemophilia), or prematurity (< 34 weeks). * **Lactate vs. pH:** Modern practice often uses fetal scalp **lactate** (> 4.8 mmol/L is abnormal) as it requires a smaller blood volume and is easier to perform than pH.

Question 517: Misoprostol is contraindicated in which of the following conditions?

A. Scarred uterus
B. Active cardiac disease
C. Bronchial asthma
D. All of the above (Correct Answer)

Explanation: **Explanation:** Misoprostol is a synthetic **Prostaglandin E1 (PGE1)** analogue used extensively in obstetrics for cervical ripening, induction of labor, and management of postpartum hemorrhage (PPH). However, its potent uterotonic and systemic effects necessitate specific contraindications: 1. **Scarred Uterus (Option A):** This is the most critical contraindication in obstetric practice. Misoprostol causes powerful, sometimes uncoordinated uterine contractions (tachysystole). In a patient with a previous cesarean section or hysterotomy, these intense contractions significantly increase the risk of **uterine rupture**, which can be fatal for both mother and fetus. 2. **Active Cardiac Disease (Option B):** Prostaglandins can cause fluctuations in blood pressure and exert stress on the cardiovascular system through peripheral vasoconstriction or vasodilation. In patients with unstable cardiac status, these hemodynamic shifts can exacerbate heart failure or arrhythmias. 3. **Bronchial Asthma (Option C):** While PGE1 (Misoprostol) is a bronchodilator in theory, in clinical practice, all prostaglandins are generally avoided or used with extreme caution in severe asthmatics due to the risk of hypersensitivity reactions or potential bronchoconstriction (more common with PGF2α, but PGE1 is traditionally avoided in active/severe cases). **Clinical Pearls for NEET-PG:** * **PGE1 (Misoprostol):** Preferred for PPH because it is stable at room temperature and inexpensive. * **PGF2α (Carboprost):** Specifically contraindicated in **Asthma** (causes bronchoconstriction). * **Methylergometrine:** Specifically contraindicated in **Hypertension** and Preeclampsia (causes peripheral vasoconstriction). * **Dinoprostone (PGE2):** Used for cervical ripening but also avoided in scarred uteri.

Question 518: What is the commonest cause of postpartum hemorrhage?

A. Atonic uterus (Correct Answer)
B. Traumatic causes
C. Combination of atonic and traumatic causes
D. Blood coagulation disorders

Explanation: **Explanation:** **Postpartum Hemorrhage (PPH)** is defined as blood loss ≥500 ml following a vaginal delivery or ≥1000 ml following a cesarean section. It remains a leading cause of maternal mortality worldwide. **Why Atonic Uterus is correct:** Uterine atony is the **most common cause of PPH**, accounting for approximately **80% of cases**. The physiological mechanism to prevent bleeding after placental delivery is the contraction of the interlacing myometrial muscle fibers (known as the "living ligatures"), which compress the spiral arteries. In uterine atony, the myometrium fails to contract effectively, leading to rapid and profuse bleeding from the placental site. **Analysis of Incorrect Options:** * **B. Traumatic causes:** These include lacerations of the cervix, vagina, or perineum, and uterine rupture. While significant, they account for only about 15–20% of PPH cases. * **C. Combination:** While multiple factors can coexist, atony alone is statistically the predominant single cause. * **D. Blood coagulation disorders (Thrombin):** These are the least common cause (approx. 1%) and are usually secondary to conditions like abruptio placentae, HELLP syndrome, or amniotic fluid embolism. **NEET-PG High-Yield Pearls:** * **The 4 Ts of PPH:** **T**one (Atony - 80%), **T**rauma (Lacerations), **T**issue (Retained products), and **T**hrombin (Coagulopathy). * **Risk Factors for Atony:** Overdistension of the uterus (polyhydramnios, multiple pregnancy, macrosomia), prolonged labor, and grand multiparity. * **Management Gold Standard:** Active Management of the Third Stage of Labor (AMTSL) reduces the risk of PPH by 60%. * **First-line drug:** Oxytocin (10 IU IM or 20 IU IV infusion). * **Surgical Step-ladder:** Bimanual compression → Uterine tamponade → B-Lynch suture → Uterine/Iliac artery ligation → Hysterectomy (last resort).

Question 519: Uterine rupture is least common with which type of uterine incision?

A. Lower segment cesarean section (LSCS) (Correct Answer)
B. Classical cesarean section
C. Inverted T-shaped incision
D. T-shaped incision

Explanation: **Explanation:** The risk of uterine rupture in a subsequent pregnancy is primarily determined by the **location and direction** of the previous uterine incision. **1. Why LSCS is the correct answer:** The Lower Segment Cesarean Section (LSCS) involves a **transverse incision** in the non-contractile, thinned-out lower uterine segment. This area undergoes minimal stretching and contraction during subsequent labor compared to the upper segment. Furthermore, the healing is superior due to less muscular interference, resulting in a rupture risk of only **0.2% to 1.5%**. This low risk makes a Trial of Labor After Cesarean (TOLAC) clinically feasible for many patients. **2. Why the other options are incorrect:** * **Classical Cesarean Section:** This involves a vertical incision in the **upper contractile segment** (the corpus). This area is thick, highly vascular, and undergoes intense contractions during labor. The scar is prone to rupture even before the onset of labor, with a high risk of **4% to 9%**. * **Inverted T and T-shaped Incisions:** These occur when a transverse lower segment incision is extended vertically into the upper segment (often due to difficulty in delivery or poor exposure). Because these incisions involve the contractile myometrium of the upper segment, they carry a high risk of rupture (approximately **4% to 9%**), similar to a classical section. **Clinical Pearls for NEET-PG:** * **Highest risk of rupture:** Classical incision (often occurs *before* labor). * **Lowest risk of rupture:** LSCS (transverse). * **Management:** Patients with a history of classical, T-shaped, or J-shaped incisions should undergo elective repeat cesarean section (ERCS) at 36-37 weeks, as TOLAC is contraindicated. * **Most common site of rupture in a scarred uterus:** Along the previous scar. * **Most common site of rupture in an unscarred uterus:** Lower segment.

Question 520: True labor differs from false labor by all the following characteristics except:

A. Presence of 'bag of waters' rupture (Correct Answer)
B. Painful uterine contractions
C. Progressive effacement and dilatation of the cervix
D. Pain often felt in the front of the abdomen or radiating towards the thighs

Explanation: **Explanation:** The diagnosis of **True Labor** is primarily clinical, defined by regular, rhythmic uterine contractions that result in progressive cervical changes. **Why Option A is the correct answer:** The rupture of membranes (the 'bag of waters') is **not** a diagnostic criterion for true labor. While it often occurs during labor, it can happen before labor begins (Premature Rupture of Membranes - PROM) or may not occur until the second stage of labor. Therefore, its presence or absence does not differentiate between true and false labor. **Analysis of Incorrect Options:** * **Option B (Painful uterine contractions):** In true labor, contractions are regular, increase in frequency and intensity, and are generally painful. False labor (Braxton-Hicks) contractions are usually painless or merely uncomfortable and irregular. * **Option C (Progressive effacement and dilatation):** This is the **hallmark** of true labor. If the cervix does not dilate or efface over time, the patient is not in true labor. * **Option D (Pain radiation):** In true labor, pain typically begins in the back and radiates to the front of the abdomen and down the thighs. In false labor, pain is usually confined to the lower abdomen and groin. **High-Yield Clinical Pearls for NEET-PG:** * **Sedation Test:** False labor pains are typically relieved by sedation or walking, whereas true labor pains are not. * **The 'Show':** The discharge of a blood-tinged mucus plug (the 'show') is a sign of impending true labor due to cervical effacement. * **Friedman’s Curve:** Used to monitor the progress of true labor based on cervical dilatation over time. * **Key Differentiator:** If a question asks for the single most important feature of true labor, always choose **progressive cervical dilatation.**

Practice by Chapter

Physiology of Labor

Practice Questions

Stages of Labor and Normal Progression

Practice Questions

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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