Labor and Delivery — MCQs

Labor and Delivery Indian Medical PG Practice Questions and MCQs

Question 1101: What do variable decelerations in fetal heart rate indicate?

A. Head compression during labor
B. Umbilical cord compression (Correct Answer)
C. Insufficient blood flow to the fetus
D. Effects of maternal medication

Explanation: ***Umbilical cord compression*** - Variable decelerations are characterized by their **abrupt onset** and **variable shape**, often resembling a 'V' or 'W', quickly dipping and returning to baseline. - This pattern is highly indicative of **umbilical cord compression**, which temporarily reduces blood flow to the fetus, causing a vagal response. *Head compression during labor* - **Early decelerations**, which are gradual and mirror the contraction, are typically associated with **head compression** during labor. - These are generally considered benign and do not signify fetal distress. *Insufficient blood flow to the fetus* - **Late decelerations**, characterized by a gradual decrease in FHR that starts after the peak of the contraction and returns to baseline only after the contraction has ended, indicate **uteroplacental insufficiency** (insufficient blood flow). - This is a more concerning sign, suggesting fetal hypoxia. *Effects of maternal medication* - While maternal medications (e.g., narcotics, magnesium sulfate) can affect fetal heart rate, they typically cause a **decrease in baseline variability** or a **sustained decrease in baseline rate**, not variable decelerations. - Variable decelerations are more directly linked to acute, mechanical stress on the umbilical cord.

Question 1102: Variable decelerations are associated with which of the following?

A. Head compression
B. Uteroplacental insufficiency
C. Cord compression (Correct Answer)
D. None of the options

Explanation: ***Cord compression*** - **Variable decelerations** are characterized by an abrupt decrease in fetal heart rate, varying in timing and amplitude relative to uterine contractions. This pattern is classically associated with **umbilical cord compression**. - When the umbilical cord is compressed, blood flow (and thus oxygen delivery) to the fetus is transiently reduced, causing a **baroreflex-mediated vagal response** that slows the heart rate. *Head compression* - **Head compression** typically causes **early decelerations**, which are gradual, symmetrical drops in fetal heart rate that mirror the uterine contraction. - This is due to an increase in **intracranial pressure** leading to a vagal response. *Uteroplacental insufficiency* - **Uteroplacental insufficiency** (e.g., placental abruption, preeclampsia) is associated with **late decelerations**, which are gradual, symmetrical decreases in fetal heart rate that begin after the peak of the contraction and return to baseline after the contraction ends. - This reflects **fetal hypoxemia** due to insufficient oxygen exchange at the placenta. *None of the options* - This option is incorrect because **variable decelerations** specifically indicate **cord compression**, a well-established association in fetal monitoring.

Question 1103: Among the following malpresentations, which is most favorable for vaginal delivery?

A. Face presentation when the chin lies direct to the sacrum
B. Brow presentation
C. Shoulder presentation
D. Face presentation with mentum anterior (chin toward symphysis pubis) (Correct Answer)

Explanation: ***Face presentation with mentum anterior (chin toward symphysis pubis)*** - Among malpresentations, mentum anterior is the **most favorable for vaginal delivery**. - The face presentation involves **extension** (not flexion) of the fetal head, with the chin as the presenting part. - With mentum anterior, the chin rotates anteriorly under the symphysis pubis, allowing the **submentobregmatic diameter** (9.5 cm) to pass through the pelvis. - The face sweeps over the perineum by a movement of **flexion**, completing delivery. - **Approximately 60-80%** of mentum anterior face presentations can deliver vaginally with careful monitoring. *Face presentation when the chin lies direct to the sacrum* - This is **mentum posterior** (or mentum sacral), which is **unfavorable for vaginal delivery**. - The hyperextended fetal head cannot flex further, and the chin becomes impacted against the maternal sacrum. - Vaginal delivery is **impossible** without rotation to mentum anterior; most cases require **cesarean section**. *Brow presentation* - The **largest fetal head diameter** (mentovertical or occipitofrontal, ~13 cm) presents to the pelvis. - Engagement and descent are usually **impossible** in a normal pelvis. - **Cesarean section** is required in most cases unless the presentation converts to face or vertex. *Shoulder presentation* - This is a **transverse lie** with the shoulder as the presenting part. - Vaginal delivery is **absolutely impossible** without external or internal version. - **Cesarean section** is mandatory to prevent uterine rupture and fetal/maternal morbidity.

Question 1104: Which of the following is a definitive indicator of true labor pain?

A. None of the options
B. Rupture of membranes (water breaking)
C. Uterine contractions at regular intervals
D. Progressive effacement and dilation of cervix (Correct Answer)

Explanation: ***Progressive effacement and dilation of cervix*** - **Progressive cervical change** (effacement and dilation) is the universally accepted definitive sign of **true labor**. - This indicates that the **uterine contractions** are effective in preparing the cervix for birth. *Uterine contractions at regular intervals* - While regular contractions are a characteristic of early labor, they can also occur with **Braxton Hicks contractions** (false labor) which do not lead to cervical change. - The **regularity** alone does not confirm that labor is true or progressive. *Rupture of membranes (water breaking)* - **Rupture of membranes** can occur before labor begins, during labor, or not at all (if artificially ruptured). - It is not a definitive sign of established **true labor**, as contractions and cervical changes are still needed for progression. *None of the options* - This option is incorrect because progressive effacement and dilation of the cervix is a **definitive indicator** of true labor. - The other options singly are not definitive, but **cervical change** is.

Question 1105: Which of the following is NOT an indicator of impending uterine rupture during labor?

A. Passage of meconium (Correct Answer)
B. Hematuria
C. Fresh bleeding per vaginum
D. Fetal distress

Explanation: ***Passage of meconium*** - While **meconium passage** in labor is a sign of **fetal stress** or hypoxia, it is not a direct indicator of impending uterine rupture. - It results from increased vagal tone and relaxation of the anal sphincter, often in response to **fetal compromise**, but doesn't specifically point to uterine integrity. *Fetal distress* - **Fetal distress**, as indicated by persistent **fetal heart rate abnormalities** (e.g., late decelerations, prolonged bradycardia), can be a critical sign of impending uterine rupture due to disrupted placental blood flow. - The sudden onset of these changes, especially after a period of normal tracing, should raise high suspicion. *Hematuria* - **Hematuria** (blood in the urine) during labor can result from trauma to the **bladder** caused by the stretching or tearing of the lower uterine segment, which often precedes rupture. - It signifies that the bladder is being compromised or directly damaged, indicating severe pressure or injury alongside uterine compromise. *Fresh bleeding per vaginum* - **Fresh, bright red vaginal bleeding** in labor, especially if sudden and not associated with cervical changes, is a significant sign of impending or actual **uterine rupture**. - This blood often originates from the disrupted uterine vessels and indicates a loss of uterine integrity.

Question 1106: Macerated foetus is indicative of:

A. Live born
B. Deadborn
C. IUGR
D. Stillborn (Correct Answer)

Explanation: ***Still born*** - A **macerated fetus** is characterized by the breakdown of fetal tissues due to **autolysis** in utero, which occurs when the fetus has died and remained in the womb for an extended period (usually >12-24 hours). - This condition is the hallmark of an **intrauterine fetal death** before delivery, defining it as a **stillbirth**. *Dead born* - While a **stillborn** fetus is technically "dead born," the term "dead born" is less precise and does not specifically imply the tissue changes (maceration) that occur with prolonged retention in utero. - The term **dead born** can encompass fetuses delivered immediately after death without significant tissue autolysis. *Live born* - A **liveborn** infant shows signs of life at birth, such as breathing, heart beat, umbilical cord pulsation, or definite voluntary muscle movement, none of which would be present in a macerated fetus. - **Maceration** is a post-mortem finding, directly indicating the fetus was not alive at birth. *IUGR* - **Intrauterine growth restriction (IUGR)** refers to a fetus that has not reached its genetically determined growth potential, resulting in an estimated fetal weight below the 10th percentile for gestational age. - While IUGR can be a risk factor for stillbirth, it is a **growth abnormality**, not a direct indicator or consequence of fetal death or maceration itself.

Question 1107: Diagonal conjugate is defined as the distance between

A. Upper border of symphysis pubis and the sacral promontory
B. Lower border of symphysis pubis and the sacral promontory (Correct Answer)
C. Lower border of symphysis pubis and the third piece of sacrum
D. Lower border of symphysis pubis and tip of sacrum

Explanation: ***Lower border of symphysis pubis and the sacral promontory*** - The **diagonal conjugate** is a clinically measurable diameter that extends from the **inferior border of the symphysis pubis** to the **sacral promontory**. - This measurement helps to estimate the **obstetrical conjugate**, which is the true anteroposterior diameter of the pelvic inlet. *Upper border of symphysis pubis and the sacral promontory* - This description corresponds to neither a clinically measurable nor an anatomically significant pelvic diameter. - The **anatomical conjugate** extends from the **upper border of the symphysis pubis** to the sacral promontory, but this is not the diagonal conjugate. *Lower border of symphysis pubis and the third piece of sacrum* - Measuring to the **third piece of the sacrum** is not a standard anatomical landmark for pelvic measurements used in obstetrics. - The important landmark for pelvic inlet dimensions is the **sacral promontory**. *Lower border of symphysis pubis and tip of sacrum* - The **tip of the sacrum** is too inferior and posterior to be relevant for measuring the diagonal conjugate and estimating the pelvic inlet. - The **sacral promontory** is the key superior point on the sacrum for this measurement.

Question 1108: Which is the most common complication during vaginal delivery in a diabetic woman?

A. Shoulder dystocia (Correct Answer)
B. Excessive moulding of head
C. Uterine inertia
D. Postpartum hemorrhage

Explanation: ***Shoulder dystocia*** - **Fetal macrosomia**, common in diabetic pregnancies, leads to disproportionate shoulder circumference relative to the head, increasing the risk of **shoulder dystocia**. - This complication occurs when the fetal shoulders get stuck behind the maternal pubic bone after the head has been delivered, requiring specific maneuvers for resolution. *Uterine inertia* - While possible, **uterine inertia** is not the most common complication specifically associated with vaginal delivery in diabetic women. - It involves inefficient uterine contractions and may lead to prolonged labor, but **fetal macrosomia** presents a more direct and frequent mechanical obstruction. *Postpartum hemorrhage* - **Postpartum hemorrhage** (PPH) is a significant complication in diabetic women, often due to **uterine atony** (a floppy uterus that doesn't contract well) resulting from overdistension by a macrosomic infant. - However, **shoulder dystocia** is a more direct and immediate mechanical complication related to fetal size during the pushing phase and is statistically more frequent during the actual delivery in these cases. *Excessive moulding of head* - **Excessive moulding** of the fetal head is more commonly associated with cephalopelvic disproportion where the fetal head is too large for the maternal pelvis, irrespective of diabetes. - In diabetic pregnancies, the primary issue is typically the disproportionate size of the fetal shoulders and trunk (macrosomia), rather than the head's ability to mold through the birth canal.

Question 1109: What is true about the partograph?

A. Alert and action lines are separated by a difference of 4 hours in a standard partograph. (Correct Answer)
B. Partograph recording should be started at a cervical dilation of 4 cm.
C. Each small square represents 30 minutes.
D. Send the patient to the first referral unit if the labor progression line crosses the action line.

Explanation: ***Alert and action lines are separated by a difference of 4 hours in a standard partograph.*** - This is **CORRECT**. In the WHO partograph, the **alert line** and **action line** are separated by **4 hours**. - The alert line runs parallel to the expected labor progression, while the action line is 4 hours to the right. - This 4-hour interval allows for close monitoring and timely intervention if labor progress deviates from normal. *Partograph recording should be started at a cervical dilation of 4 cm.* - According to **WHO 2018 guidelines**, partograph recording should now be started at **5 cm dilation**, marking the active phase of first stage of labor. - The older recommendation of 4 cm is outdated, though it may still appear in some textbooks. - Starting at 5 cm better defines the active phase and reduces unnecessary interventions. *Each small square represents 30 minutes.* - In a standard WHO partograph, each small square on the time axis represents **1 hour**, not 30 minutes. - This allows for hourly recording of cervical dilation, fetal heart rate, contractions, and other labor parameters. *Send the patient to the first referral unit if the labor progression line crosses the action line.* - When the labor curve crosses the **action line**, it indicates **prolonged labor** requiring immediate intervention. - The appropriate action depends on facility capabilities: this may include **augmentation of labor, preparing for cesarean section**, or referral if necessary. - Automatic referral is not the only or primary response; active management at the current facility is often appropriate.

Question 1110: Ventouse in 2nd stage of labour is contraindicated in:

A. Uterine inertia
B. Persistent occipito-posterior position
C. Preterm labour (Correct Answer)
D. Heart disease

Explanation: ***Preterm labour*** - **Ventouse delivery** is contraindicated in **preterm labour** due to the increased risk of **cephalohaematoma**, **intracranial haemorrhage**, and **neonatal jaundice** in pre-term infants whose skulls are more fragile. - The use of traction on a premature skull can easily cause trauma, making premature birth a major contraindication for vacuum extraction. *Persistent occipito-posterior position* - This is an indication for instrumental delivery, including **ventouse**, when rotation assistance is needed or delivery is complicated. - **Ventouse** can be used to achieve rotation and descent in this position, making it a viable option rather than a contraindication. *Heart disease* - **Ventouse delivery** can be indicated in women with **cardiac conditions** to shorten the second stage of labour, thereby reducing maternal exertion and cardiovascular strain. - It is used to prevent the physiological stress of prolonged pushing, which can exacerbate underlying heart disease. *Uterine inertia* - **Ventouse delivery** can be used to expedite delivery when there is inadequate uterine contraction leading to **uterine inertia**, and the cervix is fully dilated. - This condition prolongs labour, and instrumental delivery can help achieve birth without resorting to a C-section in some cases.

Practice by Chapter

Physiology of Labor

Practice Questions

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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