Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 751: A classical cesarean section is indicated in a patient with:

A. Previous cesarean section
B. Placenta previa
C. Carcinoma of the cervix (Correct Answer)
D. Shoulder presentation

Explanation: **Explanation:** A **Classical Cesarean Section (CCS)** involves a vertical incision in the upper contractile segment of the uterus. While the Lower Segment Cesarean Section (LSCS) is the standard of care, CCS is reserved for specific clinical scenarios where the lower segment is inaccessible or should not be disturbed. **Why Carcinoma of the Cervix is Correct:** In cases of invasive cervical cancer, the lower uterine segment and cervix are often friable, highly vascular, and infiltrated by malignant tissue. Performing an LSCS through this area can lead to **uncontrollable hemorrhage**, potential dissemination of cancer cells, and poor wound healing. A classical incision allows the surgeon to bypass the diseased lower segment entirely, facilitating delivery before proceeding with a radical hysterectomy (Wertheim’s operation). **Analysis of Incorrect Options:** * **Previous Cesarean Section:** Most repeat surgeries are performed via the lower segment (LSCS) unless there are dense adhesions or a previous classical scar. * **Placenta Previa:** While a high vertical incision is sometimes used in anterior placenta previa to avoid the placental site, it is not a routine indication. Most cases are managed via a transverse lower segment incision, often slightly higher than usual. * **Shoulder Presentation:** This is a malpresentation where the fetus lies transversely. While it may require a vertical incision if the lower segment is poorly formed (e.g., preterm), it is generally managed via a transverse LSCS. **High-Yield Clinical Pearls for NEET-PG:** * **Other Indications for CCS:** Structural abnormalities (e.g., large fibroids in the lower segment), post-mortem delivery, extremely preterm fetus with an undeveloped lower segment, and conjoined twins. * **The Major Risk:** CCS carries a significantly higher risk of **uterine rupture (4–9%)** in subsequent pregnancies compared to LSCS (0.2–1.5%). * **Rupture Timing:** A classical scar is prone to rupture **before** the onset of labor, whereas an LSCS scar typically ruptures **during** labor.

Question 752: Least chance of cord prolapse is seen in which fetal presentation?

A. Vertex (Correct Answer)
B. Breech
C. Transverse
D. Compound

Explanation: **Explanation:** Cord prolapse occurs when the umbilical cord descends below the presenting part after the rupture of membranes. The primary risk factor is a **poor fit** between the fetal presenting part and the lower uterine segment/pelvic inlet, which leaves gaps through which the cord can slip. **1. Why Vertex is the Correct Answer:** In a **Vertex presentation**, the fetal head is well-flexed and globular. It acts as an efficient "plug," fitting snugly into the pelvic inlet and filling the lower uterine segment completely. This leaves virtually no space for the umbilical cord to bypass the head, making cord prolapse rare (incidence ~0.5%). **2. Analysis of Incorrect Options:** * **Breech:** The irregular shape of the buttocks or feet does not fill the pelvis as effectively as the head. The risk is highest in **Footling breech** (15%) and moderate in **Complete breech** (5%), compared to Frank breech (0.5%). * **Transverse Lie:** This carries the **highest risk** of cord prolapse (up to 20%). Since no fetal pole occupies the lower segment, the cord can easily wash down with the amniotic fluid upon membrane rupture. * **Compound Presentation:** The presence of an extremity (like a hand) alongside the head creates gaps in the pelvic inlet, significantly increasing the risk compared to a pure vertex presentation. **Clinical Pearls for NEET-PG:** * **Most common risk factor:** Malpresentation (specifically Transverse lie and Breech). * **Most common cause overall:** Prematurity (due to small fetal size and frequent malpresentation). * **Immediate Management:** If cord prolapse is diagnosed, place the patient in the **Trendelenburg or Knee-chest position** and manually displace the presenting part upward to relieve cord compression until an emergency Cesarean section is performed. * **Gold Standard:** The quickest way to relieve pressure is manual elevation of the fetal head.

Question 753: What is the most common cause of abortion in the first trimester?

A. Placenta
B. Uterus
C. Embryo (Correct Answer)
D. Ovary

Explanation: **Explanation:** The most common cause of spontaneous abortion in the first trimester is **genetic or chromosomal abnormalities of the embryo**. Approximately 50–60% of early miscarriages are attributed to these defects, with **Autosomal Trisomy** being the most frequent specific chromosomal anomaly (Trisomy 16 being the most common). These abnormalities often lead to "blighted ovum" or early embryonic demise because the conceptus is biologically non-viable. **Analysis of Options:** * **Embryo (Correct):** As stated, intrinsic defects in the embryo (primarily numerical chromosomal errors like aneuploidy) are the leading cause of early pregnancy loss. * **Placenta:** While placental insufficiency or abruptio placentae can cause fetal loss, these are typically concerns in the second or third trimesters, not the primary cause in the first trimester. * **Uterus:** Anatomical factors such as uterine synechiae (Asherman syndrome), septate uterus, or fibroids are significant causes of **recurrent** pregnancy loss, but they are statistically less common than embryonic factors for a single first-trimester event. * **Ovary:** Luteal phase defect (insufficient progesterone production by the corpus luteum) can lead to abortion, but it is a much rarer cause compared to chromosomal issues. **NEET-PG High-Yield Pearls:** * **Most common chromosomal abnormality:** Autosomal Trisomy (Overall). * **Most common specific Trisomy:** Trisomy 16. * **Most common single chromosomal anomaly:** Monosomy X (Turner Syndrome, 45,X). * **Timing:** 80% of abortions occur within the first 12 weeks of pregnancy. * **Risk Factor:** Increasing maternal age is the most significant risk factor for embryonic aneuploidy.

Question 754: Active management of the third stage of labor is indicated for all of the following conditions EXCEPT?

A. Rh incompatibility
B. Diabetic mother
C. Prolonged pregnancy
D. Delivery of the first baby of twins (Correct Answer)

Explanation: **Explanation:** The **Active Management of the Third Stage of Labor (AMTSL)** is a standard protocol designed to prevent Postpartum Hemorrhage (PPH). It involves the administration of a uterotonic (usually Oxytocin), controlled cord traction, and uterine massage. **Why "Delivery of the first baby of twins" is the correct answer:** AMTSL is strictly **contraindicated** after the delivery of the first twin. Administering a uterotonic agent at this stage can cause hypertonic uterine contractions, leading to **fetal distress, placental abruption, or birth canal entrapment** of the second twin. AMTSL should only be initiated after the delivery of the **last** baby. **Analysis of Incorrect Options:** * **A, B, and C (Rh incompatibility, Diabetic mother, Prolonged pregnancy):** These are all singleton pregnancy scenarios or conditions where the delivery of the fetus is complete. In these cases, AMTSL is not only indicated but highly recommended. In fact, conditions like a large baby (diabetic mother) or polyhydramnios (often associated with Rh isoimmunization) increase the risk of uterine atony, making AMTSL crucial to prevent PPH. **Clinical Pearls for NEET-PG:** * **Components of AMTSL (WHO):** 1. Uterotonic administration (Oxytocin 10 IU IM is the drug of choice), 2. Delayed cord clamping (1–3 mins), 3. Controlled Cord Traction (Brandt-Andrews maneuver). * **Timing:** Oxytocin should be given within 1 minute of the birth of the (last) baby, after ruling out the presence of another fetus. * **Twin Pregnancy Rule:** Always palpate the abdomen after the first twin to confirm the lie of the second twin; never give ergometrine or oxytocin until the uterus is empty.

Question 755: Regarding precipitous labor, which of the following statements is FALSE?

A. An expulsion of the fetus in less than 3 hours
B. Can be frequently followed by uterine atony
C. Neonatal outcome is uniformly good (Correct Answer)
D. May be associated with uterine, cervical, or vaginal lacerations

Explanation: **Explanation:** **Precipitous labor** is defined as labor that lasts for **less than 3 hours** from the onset of regular contractions to the expulsion of the fetus. **Why Option C is the Correct Answer (The False Statement):** Contrary to the statement, neonatal outcomes in precipitous labor are **not** uniformly good. The rapid descent and delivery pose significant risks to the newborn, including: * **Intracranial Hemorrhage:** Sudden changes in pressure on the fetal head during rapid transit through the birth canal can lead to dural tears. * **Fetal Hypoxia:** Intense, frequent contractions (uterine tachysystole) reduce placental perfusion, leading to fetal distress. * **Aspiration:** Rapid delivery may lead to the aspiration of amniotic fluid. * **Erb’s Palsy:** Increased risk of shoulder dystocia due to lack of time for fetal rotation. **Analysis of Other Options:** * **Option A:** This is the standard clinical definition of precipitous labor. * **Option B:** Following such rapid and intense contractions, the myometrium can become "exhausted," leading to **uterine atony** and subsequent postpartum hemorrhage (PPH). * **Option D:** The lack of time for the soft tissues of the birth canal to stretch gradually often results in extensive **lacerations** of the cervix, vagina, and perineum. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Multiparity, strong uterine contractions, and low birth weight. * **Complications:** Maternal (PPH, Uterine rupture, Amniotic fluid embolism) and Fetal (Intracranial hemorrhage, Erb’s palsy). * **Management:** If anticipated, the goal is to control the delivery of the head to prevent perineal tears and intracranial injury. Tocolytics may be used if contractions are excessively frequent.

Question 756: All of the following drugs are effective for cervical ripening during pregnancy except:

A. Prostaglandin E2
B. Oxytocin
C. Progesterone (Correct Answer)
D. Misoprostol

Explanation: **Explanation:** The correct answer is **Progesterone**. Cervical ripening is the process of softening, effacing, and dilating the cervix, which involves the breakdown of collagen fibers and an increase in glycosaminoglycans. **Why Progesterone is the correct answer:** Progesterone is known as the "hormone of pregnancy" because it maintains **uterine quiescence**. It inhibits cervical ripening by decreasing collagenase activity and stabilizing the cervical extracellular matrix. In clinical practice, progesterone (e.g., vaginal progesterone or 17-OHP) is actually used to *prevent* preterm birth by keeping the cervix firm and closed. Therefore, it is not used for ripening. **Analysis of other options:** * **Prostaglandin E2 (Dinoprostone):** This is the gold standard for cervical ripening. It acts by breaking down collagen and increasing submucosal water content. It is available as intracervical gels or vaginal inserts. * **Misoprostol (Prostaglandin E1):** A highly effective synthetic prostaglandin used for both cervical ripening and labor induction. It is cost-effective and can be administered orally or vaginally. * **Oxytocin:** While primarily used for the induction and augmentation of uterine contractions, high-dose oxytocin can indirectly aid in cervical changes once the ripening process has begun. However, compared to progesterone, it is a recognized agent in the management of labor. **High-Yield Clinical Pearls for NEET-PG:** * **Bishop Score:** Used to assess the "favorability" of the cervix. A score of $\leq$ 6 indicates an unfavorable cervix requiring ripening agents. * **Mechanical Methods:** Foley catheter induction and laminaria tents are non-pharmacological alternatives for ripening. * **Mifepristone:** An anti-progesterone that *can* be used for cervical ripening (especially in intrauterine fetal death) because it antagonizes the stabilizing effect of progesterone.

Question 757: What is the management for breech presentation with hydrocephalus?

A. Cesarean section
B. Trans-abdominal decompression
C. Per vaginal decompression and craniotomy of aftercoming head
D. All of the above (Correct Answer)

Explanation: The management of breech presentation with hydrocephalus is unique because the primary goal is often to minimize maternal morbidity, as the fetal prognosis is frequently poor due to associated anomalies. **Explanation of the Correct Answer:** The correct answer is **All of the above** because the management is highly individualized based on the stage of labor, fetal viability, and maternal condition: 1. **Trans-abdominal decompression:** If the patient is in early labor and the head is high, a needle can be inserted trans-abdominally into the fetal skull to aspirate CSF, reducing the head circumference to allow engagement and vaginal delivery. 2. **Per-vaginal decompression and craniotomy:** Once the body is delivered up to the shoulders, the "aftercoming head" is trapped. Decompression can be done vaginally by performing a craniotomy (usually through the aftercoming head's occiput or via the roof of the mouth/foramen magnum) to collapse the skull and facilitate delivery. 3. **Cesarean section:** While vaginal delivery is preferred to avoid a scar for a potentially non-viable fetus, a C-section is indicated if there are maternal complications (e.g., placenta previa, obstructed labor) or if the fetus is potentially salvageable with a manageable degree of hydrocephalus. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Often suspected when there is a "non-engagement" of the head or a "crackling" sensation (Ping-pong ball sensation) on palpating the fetal skull. * **The Goal:** The obstetric priority in gross hydrocephalus is **maternal safety**. Destructive procedures (craniotomy) are ethically permissible here to prevent maternal uterine rupture. * **Associated Malformation:** Spina bifida is the most common association found in these cases. * **Method of choice for aftercoming head:** Per-vaginal aspiration of CSF using a wide-bore needle or Drew-Smythe catheter is the standard approach during the second stage of labor.

Question 758: What happens to the systolic/diastolic (S/D) ratio of the umbilical artery during the progression of labor?

A. Increases
B. Decreases (Correct Answer)
C. Persistent diastolic notch
D. Constant

Explanation: **Explanation:** The correct answer is **B. Decreases**. The **S/D ratio** (Systolic/Diastolic ratio) is a Doppler ultrasound index used to measure resistance in the umbilical artery. It is calculated by dividing the peak systolic velocity by the end-diastolic velocity. **Why the S/D ratio decreases:** As pregnancy progresses and labor advances, there is a physiological **increase in end-diastolic flow** due to the continued maturation and expansion of the placental vascular bed. This results in **decreased placental vascular resistance**. Since the denominator (diastolic flow) increases more significantly than the numerator (systolic flow), the overall S/D ratio decreases. A lower ratio indicates healthy placental perfusion, ensuring the fetus receives adequate oxygenation during the stress of labor. **Analysis of Incorrect Options:** * **A. Increases:** An increasing S/D ratio signifies rising placental resistance. This is pathological and seen in conditions like Fetal Growth Restriction (FGR) or Preeclampsia. * **C. Persistent diastolic notch:** A diastolic notch is characteristic of the **uterine artery** (not umbilical) in early pregnancy. Its persistence beyond 24 weeks indicates a high risk for preeclampsia and placental insufficiency. * **D. Constant:** The ratio is dynamic; it normally decreases throughout the third trimester and labor as the placenta becomes a low-resistance circuit. **High-Yield Clinical Pearls for NEET-PG:** * **Normal S/D ratio:** Usually <3.0 after 30 weeks and <2.0 at term. * **Critical Doppler Findings:** Absent End-Diastolic Velocity (AEDV) or Reversed End-Diastolic Velocity (REDV) in the umbilical artery are ominous signs indicating severe fetal compromise and necessitate urgent delivery. * **Ductus Venosus:** The most sensitive indicator of fetal cardiac failure in growth-restricted fetuses.

Question 759: The highest volume overload in a patient due to maximum cardiac output is seen when?

A. During the second trimester
B. At term
C. After a heavy meal
D. Immediately after delivery (Correct Answer)

Explanation: **Explanation:** The correct answer is **Immediately after delivery**. This period represents the most critical hemodynamic challenge for a patient with cardiac disease. **Why "Immediately after delivery" is correct:** During the immediate postpartum period (the first 10–15 minutes), cardiac output increases by approximately **60–80%**. This massive surge is caused by two primary mechanisms: 1. **Autotransfusion:** The contraction of the uterus (after delivery of the placenta) squeezes approximately 300–500 mL of blood back into the systemic circulation. 2. **Relief of IVC Compression:** The empty uterus no longer compresses the Inferior Vena Cava, leading to a sudden increase in venous return (preload) to the heart. **Why other options are incorrect:** * **During the second trimester:** While cardiac output begins to rise significantly (peaking around 28–32 weeks), it only increases by about 30–50% compared to pre-pregnancy levels, which is lower than the immediate postpartum surge. * **At term:** Cardiac output is high, but the gravid uterus causes maximal IVC compression when supine, which can actually decrease venous return. * **After a heavy meal:** While digestion increases splanchnic blood flow, the increase is physiologically negligible compared to the hemodynamic shifts of pregnancy and labor. **High-Yield Clinical Pearls for NEET-PG:** * **Peak CO during Labor:** During the second stage of labor, CO increases by 50% due to pain and contractions. * **The Danger Zone:** Most deaths in cardiac patients occur during labor or the immediate postpartum period due to pulmonary edema or heart failure. * **Management:** In patients with heart disease, the postpartum period requires strict fluid restriction and monitoring for "decompensation." * **Order of CO increase:** Postpartum > 2nd Stage of Labor > 1st Stage of Labor > 28-32 weeks gestation.

Question 760: Induction of labor at term is not indicated in which of the following conditions?

A. Preeclampsia (Correct Answer)
B. Diabetes Mellitus
C. Heart disease
D. Renal disease

Explanation: **Explanation:** The goal of induction of labor (IOL) is to initiate labor when the benefits of delivery to either the mother or the fetus outweigh the risks of continuing the pregnancy. **Why Preeclampsia is the correct answer (in the context of this question):** In clinical practice, preeclampsia is actually a **common indication** for induction of labor at term to prevent complications like eclampsia or placental abruption. However, in the context of standard NEET-PG patterns and classic textbooks (like Williams Obstetrics), if a question asks which is *not* an indication among these systemic diseases, it often refers to the fact that **mild preeclampsia** can be managed expectantly until 37 weeks. *Note: There appears to be a discrepancy in the provided key, as all four options are technically indications for IOL at term. However, if forced to choose, some examiners argue that in stable, mild preeclampsia, spontaneous labor is preferred over aggressive induction if the maternal-fetal status is reassuring, whereas systemic diseases like Diabetes or Renal disease often require planned delivery to prevent sudden metabolic or functional deterioration.* **Analysis of Incorrect Options:** * **Diabetes Mellitus:** IOL is indicated at 39 weeks (or earlier if poorly controlled) to prevent macrosomia, shoulder dystocia, and stillbirth. * **Heart Disease:** Planned delivery (often IOL) is preferred to ensure the presence of a multidisciplinary team (cardiology/anesthesia) and to manage the hemodynamic stress of labor. * **Renal Disease:** Pregnancy puts immense strain on compromised kidneys; induction is indicated at term to prevent further deterioration of maternal renal function and preeclampsia. **Clinical Pearls for NEET-PG:** * **Absolute Contraindications to IOL:** Classical cesarean section scar, placenta previa, vasa previa, active genital herpes, and transverse lie. * **Bishop Score:** The most important predictor of successful induction. A score of **≥8** suggests a high likelihood of vaginal delivery. * **Drug of Choice:** Oxytocin is used for induction with a favorable cervix; Prostaglandins (PGE2/PGE1) are used for cervical ripening (unfavorable cervix).

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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