Labor and Delivery Practice Questions

Q: Contraindications to ergometrine are all except:

Atonic uterine bleeding. **Explanation:** The question asks for the condition where ergometrine is **not** contraindicated. Ergometrine (an ergot alkaloid) is a potent uterotonic agent that causes tetanic uterine contractions. Its primary clinical indication is the management of **Atonic Postpartum Hemorrhage (PPH)**. **1. Why "Atonic uterine bleeding" is the correct answer:** Ergometrine is the drug of choice (alongside Oxytocin) for controlling bleeding caused by uterine atony. It acts directly on the myometrium to produce sustained contractions, which compress the intramyometrial blood vessels, thereby achieving hemostasis. Therefore, it is an **indication**, not a contraindication. **2. Why the other options are Contraindications:** * **Suspected multiple pregnancy:** Ergometrine should never be given before the delivery of the last fetus. If administered after the birth of the first twin, the resulting tetanic contraction can cause fetal hypoxia or entrapment of the second twin. * **Cardiac problems:** Ergometrine causes peripheral vasoconstriction and a sudden rise in blood pressure. This increases the cardiac workload (afterload) and can precipitate heart failure or pulmonary edema in patients with pre-existing cardiac disease. * **Rh-negative mother:** Ergometrine-induced vigorous contractions can increase the risk of feto-maternal macro-transfusion, potentially worsening Rh-isoimmunization. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Acts on alpha-adrenergic, dopaminergic, and serotonergic receptors. * **Absolute Contraindications:** Preeclampsia, Eclampsia, Hypertension, and Organic Heart Disease (due to the risk of hypertensive crisis). * **Storage:** It is light-sensitive and must be stored in a cool, dark place (refrigerated at 2–8°C). * **Side Effects:** Nausea, vomiting, and transient hypertension are common.

Q: The classical triad of amniotic fluid embolism includes which of the following, except:

Metabolic acidosis. **Explanation:** Amniotic Fluid Embolism (AFE) is a rare but catastrophic obstetric emergency characterized by an anaphylactoid reaction to fetal debris entering the maternal circulation. The diagnosis is primarily clinical, based on a classic triad of symptoms. **1. Why "Metabolic Acidosis" is the correct answer:** While metabolic acidosis may occur as a secondary complication of prolonged shock or cardiac arrest, it is **not** part of the classical diagnostic triad. The triad focuses on the immediate physiological collapse: respiratory failure, cardiovascular collapse, and hematological failure. **2. Analysis of Incorrect Options (The Classical Triad):** * **Hypoxia (Option C):** This is often the earliest sign. It manifests as sudden respiratory distress, cyanosis, or acute pulmonary edema due to severe ventilation-perfusion mismatch. * **Hypotension (Option B):** This represents sudden cardiovascular collapse. It is caused by acute right heart failure (cor pulmonale) followed by left ventricular failure, often leading to cardiac arrest within minutes. * **Severe Consumptive Coagulopathy (Option D):** Disseminated Intravascular Coagulation (DIC) occurs in up to 80% of survivors. It presents as massive hemorrhage (often uterine atony) and bleeding from venipuncture sites. **NEET-PG High-Yield Pearls:** * **Alternative Name:** Also known as "Anaphylactoid Syndrome of Pregnancy." * **Risk Factors:** Advanced maternal age, multiparity, placental abruption, and medically induced labor. * **Pathognomonic Finding:** Presence of fetal squamous cells or lanugo hair in the maternal pulmonary circulation (usually found during autopsy). * **Management:** Immediate supportive care (A-B-C: Airway, Breathing, Circulation). There is no specific antidote; high-quality CPR and aggressive blood product replacement (massive transfusion protocol) are vital.

Q: When the head of a baby is markedly deflexed during labor, which diameter typically engages?

Occipitofrontal. ### Explanation The presentation of the fetal head depends entirely on the degree of flexion or extension. In a normal labor process, the head is well-flexed, presenting the smallest diameter. **1. Why Occipitofrontal is Correct:** When the head is **markedly deflexed** (also known as the "military attitude"), the head is neither flexed nor extended. In this neutral position, the **Occipitofrontal diameter** becomes the engaging diameter. It measures approximately **11.5 cm** and extends from the prominent point of the occiput to the root of the nose (glabella). This diameter is larger than the fully flexed diameter, often leading to a more protracted labor. **2. Analysis of Incorrect Options:** * **Suboccipitof rontal (10 cm):** This diameter engages when the head is **partially deflexed**. It extends from the suboccipital region to the anterior end of the anterior fontanelle. * **Mentovertical (13.5 cm):** This is the largest diameter of the fetal head, engaging during a **Brow presentation** (partial extension). It extends from the chin to the highest point on the vertex. * **Submentovertical (11.5 cm):** This diameter engages in a **Face presentation** when the head is incompletely extended. **3. Clinical Pearls for NEET-PG:** * **Well-Flexed Head (Vertex):** Engaging diameter is **Suboccipitobregmatic (9.5 cm)**. This is the ideal diameter for vaginal delivery. * **Completely Extended Head (Face):** Engaging diameter is **Submentobregmatic (9.5 cm)**. * **Mnemonic for Diameters:** Remember that as the head moves from flexion to extension, the engaging diameter increases (9.5 → 10 → 11.5 → 13.5) before decreasing again in face presentations (11.5 → 9.5). * **Military Attitude:** Often associated with an occipitoposterior position, it may spontaneously flex as labor progresses or persist, leading to transverse arrest.

Q: A diabetic mother delivers a baby, but the baby's head is delivered, and the shoulder has not been delivered even after one minute. What is the next course of action?

McRoberts maneuver. **Explanation:** The clinical scenario describes **Shoulder Dystocia**, a life-threatening obstetric emergency where the fetal head is delivered but the anterior shoulder becomes impacted behind the maternal symphysis pubis. The "one-minute" delay and the history of maternal diabetes (a risk factor for fetal macrosomia) are classic diagnostic indicators. **1. Why McRoberts Maneuver is Correct:** The **McRoberts maneuver** is the first-line management for shoulder dystocia. It involves hyperflexing the mother's legs against her abdomen. This action flattens the sacral promontory and rotates the symphysis pubis cephalad, increasing the functional space in the pelvic inlet and allowing the impacted shoulder to slip under the pubic bone. It has a high success rate (up to 90%) and carries the lowest risk of maternal or fetal trauma. **2. Why Other Options are Incorrect:** * **Cleidotomy (A):** This involves surgical fracturing of the fetal clavicle. It is a destructive procedure reserved for a dead fetus or as a last resort in extreme cases. * **Cesarean Section (C):** Once the head is delivered, a standard C-section is not possible. The **Zavanelli maneuver** (pushing the head back into the vagina followed by C-section) is a desperate, final measure with high morbidity. * **Lateral Traction (D):** Strong downward or lateral traction on the fetal head is **contraindicated**, as it significantly increases the risk of **Brachial Plexus Injury (Erb’s Palsy)**. **Clinical Pearls for NEET-PG:** * **Turtle Sign:** The fetal head retracts against the perineum (pathognomonic for shoulder dystocia). * **HELPERR Mnemonic:** A standard protocol (H-Help, E-Episiotomy, L-Legs/McRoberts, P-Suprapubic pressure, E-Enter/Internal rotation, R-Remove posterior arm, R-Roll the patient). * **Suprapubic Pressure (Mazzanti Maneuver):** Often performed alongside McRoberts; never apply fundal pressure as it worsens impaction.

Q: During active labor, what is the recommended cervical dilatation per hour in a primigravida?

1.0 cm. **Explanation:** The correct answer is **1.0 cm/hr**. This value is based on the classic **Friedman’s Curve**, which defines the minimum expected rate of cervical dilatation during the active phase of labor. **1. Why 1.0 cm/hr is correct:** In a primigravida, the active phase of labor (traditionally starting at 3–4 cm dilatation) is characterized by a more gradual progression compared to multigravidas. According to Friedman, the minimum rate of dilatation in a primigravida is **1.2 cm/hr**, but for clinical and examination purposes (and per WHO Partograph guidelines), **1 cm/hr** is the standard threshold used to identify normal progress. **2. Analysis of Incorrect Options:** * **B (1.5 cm/hr):** This is the minimum expected rate for a **multigravida**. Multigravidas progress faster due to reduced soft tissue resistance. * **C (1-7 cm):** This is a range of dilatation, not a rate (cm/hr), and is clinically irrelevant as a measure of progress. * **D (2 cm/hr):** This exceeds the average rate for a primigravida and is not used as a diagnostic threshold for normal labor. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Guidelines (Recent Change):** While Friedman used 3–4 cm, the WHO now defines the active phase as starting at **5 cm** dilatation. However, the "1 cm/hr" rule remains the gold standard for the **Alert Line** on a partograph. * **Protracted Active Phase:** Dilatation <1.2 cm/hr (Primi) or <1.5 cm/hr (Multi). * **Arrest of Dilatation:** No cervical change for ≥2 hours in the active phase. * **Friedman’s Stages:** Remember that in primigravidas, **effacement** usually precedes dilatation, whereas in multigravidas, both occur simultaneously.

Q: Which of the following is an absolute contraindication for vaginal delivery?

Central placenta previa. **Explanation:** **Central Placenta Previa (Type IV)** is an absolute contraindication for vaginal delivery because the placenta completely covers the internal os. As the cervix dilates during labor, the placental attachments are inevitably sheared off, leading to catastrophic, life-threatening maternal hemorrhage and fetal exsanguination. In such cases, elective cesarean section is mandatory. **Analysis of Incorrect Options:** * **Previous Cesarean Section:** This is a *relative* contraindication. Many women are candidates for **VBAC** (Vaginal Birth After Cesarean) or **TOLAC** (Trial of Labor After Cesarean), provided the previous incision was a low transverse uterine incision and there are no other complications. * **Breech Presentation:** While often delivered via cesarean to reduce neonatal morbidity, vaginal breech delivery is possible in specific circumstances (e.g., frank breech, adequate pelvis, multiparity) and is therefore a *relative* contraindication. * **Heart Disease in Pregnancy:** Most cardiac patients are actually encouraged to have a **planned vaginal delivery** (often with an assisted second stage using forceps/ventouse to limit maternal pushing) because it involves less blood loss and lower risk of postoperative thromboembolism compared to surgery. **NEET-PG High-Yield Pearls:** * **Absolute Contraindications to Vaginal Delivery:** Central placenta previa, vasa previa, pelvic inlet contraction (CPD), active genital herpes, and transverse lie. * **Management of Placenta Previa:** If the placental edge is **>2 cm** from the internal os, vaginal delivery can be attempted. If **<2 cm or covering the os**, cesarean is required. * **Stallworthy’s Sign:** A drop in fetal heart rate when the head is pressed into the pelvis, seen in posterior placenta previa.

Q: Blood in urine during labor is diagnostic of:

Obstructed labor. **Explanation:** **Obstructed labor** is the correct answer because hematuria is a classic clinical sign of prolonged pressure on the maternal soft tissues. In obstructed labor, the fetal presenting part is tightly wedged against the maternal symphysis pubis. This causes significant compression of the **bladder and urethra**, leading to pressure necrosis, capillary damage, and subsequent bleeding into the urinary tract. Hematuria in this context is often a precursor to the formation of a vesicovaginal fistula (VVF). **Analysis of Incorrect Options:** * **Impending scar rupture:** While hematuria can occasionally be seen in actual uterine rupture, the most characteristic signs of *impending* rupture are a pathological retraction ring (Bandl’s ring), intense abdominal pain, and fetal distress. Hematuria is more specific to the mechanical trauma of obstruction. * **Urethral injury:** While this causes blood in the urine, it is usually a result of direct trauma (e.g., forceps delivery or catheterization) rather than a diagnostic feature of the labor process itself. * **Cystitis:** This is a pre-existing or postpartum infection. While it causes microscopic or gross hematuria, it is accompanied by frequency, urgency, and dysuria, and is not a diagnostic hallmark of labor progression. **High-Yield Clinical Pearls for NEET-PG:** * **Bandl’s Ring:** A pathognomonic sign of obstructed labor, representing the visible junction between the thickened upper uterine segment and the thinned-out lower segment. * **Vesicovaginal Fistula (VVF):** The most common cause of VVF in developing countries is neglected obstructed labor due to ischemic necrosis. * **Triad of Obstructed Labor:** Maternal exhaustion/dehydration, Bandl’s ring, and features of fetal distress. * **Management:** Obstructed labor is a surgical emergency; the definitive management is almost always a **Cesarean Section**.

Question 1

What is an indication for the induction of labor?

Accepted Answer

Pregnancy-induced hypertension at term

Answer

Placenta previa

Answer

Heart disease at term

Answer

Breech presentation

Question 2

Contraindications to ergometrine are all except:

Accepted Answer

Atonic uterine bleeding

Answer

Suspected multiple pregnancy

Answer

Cardiac problems

Answer

Rh-negative mother

Question 3

The classical triad of amniotic fluid embolism includes which of the following, except:

Accepted Answer

Metabolic acidosis

Answer

Hypotension

Answer

Hypoxia

Answer

Severe consumptive coagulopathy

Question 4

When the head of a baby is markedly deflexed during labor, which diameter typically engages?

Accepted Answer

Occipitofrontal

Answer

Suboccipitorontal

Answer

Mentovertical

Answer

Submentovertical

Question 5

A diabetic mother delivers a baby, but the baby's head is delivered, and the shoulder has not been delivered even after one minute. What is the next course of action?

Accepted Answer

McRoberts maneuver

Answer

Cleidotomy

Answer

Cesarean section

Answer

Lateral traction

Question 6

During active labor, what is the recommended cervical dilatation per hour in a primigravida?

Accepted Answer

1.0 cm

Answer

1.5 cm

Answer

1-7 cm

Answer

2 cm

Question 7

Which of the following is an absolute contraindication for vaginal delivery?

Accepted Answer

Central placenta previa

Answer

Previous cesarean section

Answer

Breech presentation

Answer

Heart disease in pregnancy

Question 8

Which of the following is true about significant variable decelerations?

Accepted Answer

A drop in fetal heart rate to less than 70 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 90 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 100 bpm for 60 seconds

Answer

A drop in fetal heart rate to less than 80 bpm for 60 seconds

Question 9

A 25-year-old G1P0 delivers a 33-week infant vaginally. The delivery is uncomplicated. If the obstetrician wishes to optimize the outcome for the infant, when should the umbilical cord be clamped?

Accepted Answer

Between 30 and 60 seconds

Answer

Immediately

Answer

After 60 seconds

Answer

Leave the cord unclamped until delivery of the placenta

Question 10

Blood in urine during labor is diagnostic of:

Accepted Answer

Obstructed labor

Answer

Impending scar rupture

Answer

Urethral injury

Answer

Cystitis

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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