Obstetric Anesthesia Practice Questions

Q: For painless delivery using epidural anaesthesia, what dermatomal level of block is typically desired?

T10 - S5. To achieve effective labor analgesia (painless delivery), the anesthetic block must cover the pain pathways associated with both the first and second stages of labor. **1. Why T10 – S5 is correct:** * **First Stage of Labor:** Pain is primarily visceral, caused by uterine contractions and cervical dilation. These impulses travel via sympathetic afferents to the **T10 to L1** spinal segments. * **Second Stage of Labor:** Pain becomes somatic due to the stretching of the pelvic floor, vagina, and perineum as the fetus descends. these impulses travel via the pudendal nerve to the **S2 to S4** spinal segments. * Therefore, a comprehensive block from **T10 to S5** ensures coverage for both stages, providing relief from uterine contractions through to the delivery of the baby. **2. Why other options are incorrect:** * **T11 – L5:** This range is insufficient. It misses the upper dermatomes (T10) required for the first stage and, more importantly, lacks the sacral coverage (S2–S4) necessary for the second stage. * **T4 – S5:** This level is too high. A T4 level is typically the target for a **Cesarean Section** to prevent discomfort during peritoneal traction. For labor analgesia, this would cause unnecessary motor blockade and potential hypotension. * **L1 – S5:** This misses the T10–T12 segments, leaving the patient with significant pain during uterine contractions in the first stage. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Epidural analgesia is the gold standard for labor pain relief. * **Concentration:** "Walking epidurals" use low-dose local anesthetics (e.g., 0.0625% Bupivacaine) combined with opioids (Fentanyl) to provide sensory block while sparing motor function. * **Complication:** The most common side effect of regional anesthesia in obstetrics is **maternal hypotension** due to sympathetic blockade.

Question 1

A pregnant patient at full term has both mitral stenosis and mitral regurgitation. If the obstetrician plans to conduct a normal delivery, what would be the preferred method of analgesia?

Accepted Answer

Neuraxial analgesia

Answer

Parenteral opioids

Answer

General anesthesia

Answer

Inhalational analgesia

Question 2

A term gestation patient with critical aortic stenosis presents to labor, and her cervix is 6 cm dilated. Your approach to the treatment of this patient includes all except:

Accepted Answer

Restrict IV fluids to decrease cardiac preload.

Answer

Provide epidural analgesia.

Answer

Limit activity.

Answer

Perform pulmonary artery catheterization.

Question 3

Which of the following drugs is the vasopressor of choice in pregnancy?

Accepted Answer

Ephedrine

Answer

Phenylephrine

Answer

Methoxamine

Answer

Mephentermine

Question 4

Which of the following statements regarding neuraxial opioids for labor and delivery is true?

Accepted Answer

Systemic absorption is similar to intramuscular administration.

Answer

Opioids should never be used as a sole agent.

Answer

The most common side effect is fetal bradycardia.

Answer

Intrathecal morphine is associated with a quick peak in concentration and early onset maternal respiratory depression.

Question 5

For painless delivery using epidural anaesthesia, what dermatomal level of block is typically desired?

Accepted Answer

T10 - S5

Answer

T11 - L5

Answer

T4 - S5

Answer

L1 - S5

Obstetric Anesthesia — MCQs

Obstetric Anesthesia — MCQs

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