Labor and Delivery Practice Questions

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

Vertex. **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.

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

Embryo. **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.

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

Delivery of the first baby of twins. **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.

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

Neonatal outcome is uniformly good. **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.

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

Progesterone. **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.

Q: What is the management for breech presentation with hydrocephalus?

All of the above. 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.

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

Decreases. **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.

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

Immediately after delivery. **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 1

A classical cesarean section is indicated in a patient with:

Accepted Answer

Carcinoma of the cervix

Answer

Previous cesarean section

Answer

Placenta previa

Answer

Shoulder presentation

Question 2

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

Accepted Answer

Vertex

Answer

Breech

Answer

Transverse

Answer

Compound

Question 3

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

Accepted Answer

Embryo

Answer

Placenta

Answer

Uterus

Answer

Ovary

Question 4

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

Accepted Answer

Delivery of the first baby of twins

Answer

Rh incompatibility

Answer

Diabetic mother

Answer

Prolonged pregnancy

Question 5

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

Accepted Answer

Neonatal outcome is uniformly good

Answer

An expulsion of the fetus in less than 3 hours

Answer

Can be frequently followed by uterine atony

Answer

May be associated with uterine, cervical, or vaginal lacerations

Question 6

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

Accepted Answer

Progesterone

Answer

Prostaglandin E2

Answer

Oxytocin

Answer

Misoprostol

Question 7

What is the management for breech presentation with hydrocephalus?

Accepted Answer

All of the above

Answer

Cesarean section

Answer

Trans-abdominal decompression

Answer

Per vaginal decompression and craniotomy of aftercoming head

Question 8

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

Accepted Answer

Decreases

Answer

Increases

Answer

Persistent diastolic notch

Answer

Constant

Question 9

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

Accepted Answer

Immediately after delivery

Answer

During the second trimester

Answer

At term

Answer

After a heavy meal

Question 10

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

Accepted Answer

Preeclampsia

Answer

Diabetes Mellitus

Answer

Heart disease

Answer

Renal disease

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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