Labor and Delivery

Labor and Delivery Indian Medical PG Question 1: A primigravida presents to the labor room at 40 weeks of gestation with lower abdominal pain. She has been in labor for 3 hours. Which of the following will determine if she is in active labor?

• A. Fetal head 5/5 palpable on abdominal examination
• B. Two contractions lasting for 10 seconds in 10 minutes
• C. Rupture of membranes
• D. Cervical dilatation of 6 cm or more with regular contractions (Correct Answer)

Labor and Delivery Explanation: ***Cervical dilatation of 6 cm or more with regular contractions*** - Active labor is officially defined by **cervical dilatation of 6 cm or more** according to the ACOG and SMFM 2014 consensus guidelines, which redefined the labor curve based on the Consortium on Safe Labor study. - This represents a shift from the traditional Friedman curve definition of 4 cm, recognizing that **significant progressive cervical change** with regular uterine contractions is the hallmark of active labor. - Complete effacement typically occurs during the latent phase, and while regular contractions accompany active labor, **cervical dilatation ≥6 cm is the primary diagnostic criterion**. *Fetal head 5/5 palpable on abdominal examination* - This finding indicates a **high fetal head** that is not engaged (0/5 of the head has entered the pelvis), which does not determine whether active labor has begun. - **Fetal station and engagement** are important for assessing labor progression and potential for cephalopelvic disproportion, but are not the primary criteria for diagnosing active labor. *Two contractions lasting for 10 seconds in 10 minutes* - These contractions are **infrequent and very short**, more characteristic of latent labor or Braxton Hicks contractions. - Active labor typically involves **3-5 contractions in 10 minutes, each lasting 45-60 seconds**, with sufficient intensity to cause progressive cervical change. *Rupture of membranes* - **Rupture of membranes (ROM)**, whether spontaneous or artificial, is an important event but does not by itself indicate active labor. - A woman can have ROM in the **latent phase** or even before labor begins (prelabor ROM or PROM), and **cervical dilatation remains the primary determinant** of active labor.

Labor and Delivery Indian Medical PG Question 2: Which of the following statements represents the PRIMARY obstetric significance at the level of plane of least pelvic dimensions? 1. It is a landmark used for pudendal nerve block analgesia. 2. Deep transverse arrest usually occurs at this plane. 3. It is at this plane that the internal rotation of the fetal head occurs during labour. 4. It marks the beginning of the backward curve of the pelvic axis.

• A. 4. It marks the beginning of the backward curve of the pelvic axis.
• B. 2. Deep transverse arrest usually occurs at this plane.
• C. 3. It is at this plane that the internal rotation of the fetal head occurs during labour.
• D. 1. It is a landmark used for pudendal nerve block analgesia. (Correct Answer)

Labor and Delivery Explanation: ***It is a landmark used for pudendal nerve block analgesia.*** - The **ischial spines**, which define the plane of least pelvic dimensions, are a crucial landmark for administering a **pudendal nerve block**. - This local anesthetic procedure targets the pudendal nerve as it passes by the **ischial spines**, providing pain relief to the perineum, vulva, and lower vagina. - While this is clinically important, it represents a **procedural application** rather than the primary obstetric mechanism at this plane. *Deep transverse arrest usually occurs at this plane.* - **Deep transverse arrest** occurs when the fetal head fails to rotate from the transverse position at the level of the **ischial spines** (plane of least dimensions). - This represents an important **obstetric complication** but is a pathological condition rather than the normal mechanism of labor at this level. *It is at this plane that the internal rotation of the fetal head occurs during labour.* - **Internal rotation** of the fetal head is a critical mechanism that occurs as the head descends to the level of the **ischial spines** and engages with the pelvic floor. - This represents the **normal physiological mechanism** of labor at this plane, where the head rotates to align with the anteroposterior diameter of the outlet. - However, internal rotation is a **process** that begins above and continues through this plane, rather than occurring exclusively at this single level. *It marks the beginning of the backward curve of the pelvic axis.* - The **pelvic axis** (curve of Carus) represents the path of fetal descent through the pelvis. - The axis does change direction at the level of the ischial spines, beginning to curve **posteriorly**. - However, this is an **anatomical description** rather than the primary obstetric significance related to labor mechanisms at this plane. **Note:** The marking of Option 1 as correct reflects the traditional teaching that the **ischial spines as a clinical landmark** is considered the primary significance. However, from a labor mechanism perspective, internal rotation (Option 3) is equally significant. The question tests understanding of the multiple roles of this anatomical plane.

Labor and Delivery Indian Medical PG Question 3: The components of partograph are all EXCEPT:

• A. Fetal heart rate
• B. Time
• C. Maternal respiratory rate (Correct Answer)
• D. Maternal urine analysis

Labor and Delivery Explanation: ***Maternal respiratory rate*** - While important for overall maternal well-being, **maternal respiratory rate** is not a standard component recorded on a partograph. - The partograph primarily focuses on monitoring fetal well-being, cervical dilation, and uterine contractions to track labor progress. *Fetal heart rate* - **Fetal heart rate** is a crucial component of the partograph, regularly plotted to assess fetal well-being and identify signs of distress. - It helps in detecting fetal hypoxia and guiding interventions if necessary during labor. *Time* - **Time** is a fundamental axis on the partograph, allowing for the plotting of all other parameters against a temporal scale. - This enables the healthcare provider to visualize the progression of labor and identify deviations from normal patterns. *Maternal urine analysis* - **Maternal urine analysis** for protein, acetone, or glucose is a standard component of the partograph. - It helps in assessing maternal hydration status and detecting potential complications like pre-eclampsia or gestational diabetes that might impact labor or fetal health.

Labor and Delivery Indian Medical PG Question 4: The progress of labour can be monitored by observing the following except:

• A. Gradual increase in cervical dilatation by vaginal examination
• B. The descent of foetal head by abdominal examination
• C. The formation of caput by vaginal examination (Correct Answer)
• D. The intensity of uterine contractions by abdominal examination

Labor and Delivery Explanation: ***The formation of caput by vaginal examination*** - The formation of a **caput succedaneum** (swelling on the fetal scalp) indicates **prolonged pressure** on the fetal head, which can be a sign of **cephalopelvic disproportion** or prolonged labor, rather than a direct measure of labor progression. - While its presence is noted during labor, caput formation itself does not actively monitor the *progress* of cervical dilatation or fetal descent in a positive way; rather, it often signals a potential **complication** or **stalling** of labor. *Gradual increase in cervical dilatation by vaginal examination* - **Cervical dilatation** is a primary indicator of the **first stage of labor progression**, as the cervix opens to allow passage of the fetus. - Regular **vaginal examinations** determine the rate and extent of cervical opening, crucial for deciding management. *The descent of foetal head by abdominal examination* - **Fetal head descent**, assessed by **abdominal palpation** (e.g., using the "fifths palpable" method), indicates the baby's movement through the birth canal. - This is a key measure of **progress in the second stage of labor** and helps identify potential obstructed labor. *The intensity of uterine contractions by abdominal examination* - The **intensity, frequency, and duration of uterine contractions** directly correlate with the forces driving labor progression. - While palpation provides a good estimate, this helps monitor the **effectiveness of uterine activity** in causing cervical changes and fetal descent.

Labor and Delivery Indian Medical PG Question 5: Consider the following cardinal movements of mechanism of normal labor: 1. Engagement 2. Internal rotation 3. Flexion 4. Restitution 5. Crowning 6. External rotation What is the correct sequence of movements in labor in occipito-lateral position?

• A. 1, 3, 2, 5, 4 and 6 (Correct Answer)
• B. 3, 1, 2, 4, 6 and 5
• C. 1, 2, 3, 4, 5 and 6
• D. 2, 1, 3, 4, 5 and 6

Labor and Delivery Explanation: ***1, 3, 2, 5, 4 and 6*** - This sequence accurately represents the order of events during normal vaginal delivery **in occipito-lateral position**, starting with **engagement** and progressing through the cardinal movements. - The sequence follows: **Engagement (1)** → **Flexion (3)** → **Internal rotation (2)** from occipito-lateral to occipito-anterior → **Crowning (5)** during extension phase → **Restitution (4)** → **External rotation (6)**. - While **crowning** is not technically a cardinal movement, it occurs during the **extension** phase and marks the emergence of the fetal head at the introitus. - In **occipito-lateral position**, internal rotation is essential for converting the position to occipito-anterior for delivery. *3, 1, 2, 4, 6 and 5* - This sequence incorrectly places **flexion before engagement**, which is physiologically impossible as the fetal head must first engage in the pelvic inlet before significant flexion occurs. - **Crowning** is placed after external rotation, but crowning occurs during the extension phase, well before restitution and external rotation. *1, 2, 3, 4, 5 and 6* - This sequence incorrectly places **internal rotation before flexion**, whereas flexion typically occurs first to reduce the presenting diameter and facilitate internal rotation. - The sequence also places **crowning after restitution**, which contradicts the normal progression where crowning occurs during extension, before restitution. *2, 1, 3, 4, 5 and 6* - This sequence incorrectly begins with **internal rotation before engagement**, which is physiologically impossible as the fetal head must be engaged in the pelvis before it can rotate. - **Engagement** must always be the first cardinal movement.

Labor and Delivery Flashcard 1 of 5

Question: The fourth stage of labour is a stage of observation for at least _____ after the full expulsion of the placenta.

Answer: an hour

Labor and Delivery Flashcard 2 of 5

Question: neonatal care corner is located _____

Answer: in the labor room 

Extra Information: 

Labor and Delivery Flashcard 3 of 5

Question: A transverse lie is managed by _____

Answer: caesarean section.

Labor and Delivery Flashcard 4 of 5

Question: On a partograph, fetal heart rate is recorded every _____

Answer: 30 mins

Labor and Delivery Flashcard 5 of 5

Question: Diameter of engagement is anteroposterior in _____ pelvis

Answer: anthropoid