Obstetric Anesthesia Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Obstetric Anesthesia. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Obstetric Anesthesia Indian Medical PG Question 1: Anesthesia of choice for cesarean section in severe preeclampsia:-
- A. Spinal (Correct Answer)
- B. GA
- C. Epidural
- D. Combined spinal-epidural (CSE)
Obstetric Anesthesia Explanation: ***Spinal***
- **Spinal anesthesia** is generally preferred in severe preeclampsia because it provides **rapid onset** of dense block, which can be critical for emergent cesarean sections.
- It avoids the risks associated with general anesthesia in these patients, such as difficult intubation and exaggerated **hypertensive response** to laryngoscopy.
*GA*
- **General anesthesia (GA)** in severe preeclampsia carries increased risks due to **airway edema**, potential for difficult intubation, and significant **blood pressure fluctuations** during induction and intubation.
- It can exacerbate the already compromised uteroplacental perfusion due to the sympathetic blockade and the potential for a **hypotensive episode**.
*Epidural*
- While generally safe in less severe preeclampsia, an **epidural** has a **slower onset** compared to spinal anesthesia, which may be a disadvantage in emergent situations.
- The gradual sympathetic blockade with an epidural is often preferred to avoid sudden drops in blood pressure, but the delay in achieving a surgical block might not be acceptable in severe, unstable cases.
*Combined spinal-epidural (CSE)*
- **Combined spinal-epidural (CSE)** offers the rapid onset of a spinal block with the flexibility of an epidural catheter for prolonged anesthesia or postoperative pain control.
- However, in cases of severe preeclampsia where **hemodynamic instability** is a major concern, the relatively larger dose of local anesthetic required for epidural component can lead to a more pronounced or rapid drop in blood pressure.
Obstetric Anesthesia Indian Medical PG Question 2: The fetal well-being can be assessed by all of the following, except
- A. non-stress test
- B. ultrasound
- C. contraction stress test
- D. Kleihauer-Betke test (Correct Answer)
Obstetric Anesthesia Explanation: ***Kleihauer-Betke test***
- The **Kleihauer-Betke test** is used to quantify the amount of **fetal hemoglobin** that has entered the maternal circulation, typically in cases of **fetomaternal hemorrhage**.
- It does assess fetal red blood cells in maternal circulation but does not directly assess current fetal well-being in terms of **cardiac activity**, **movement**, or **oxygenation**.
*non-stress test*
- The **non-stress test (NST)** monitors **fetal heart rate (FHR)** accelerations in response to fetal movement as an indicator of adequate **fetal oxygenation** and **autonomic nervous system function**.
- A **reactive NST** with appropriate accelerations is considered a sign of **fetal well-being**.
*ultrasound*
- **Ultrasound** is a versatile tool for assessing fetal well-being, providing information on **fetal growth**, **anatomy**, **amniotic fluid volume**, and **biophysical profile (BPP)**.
- The BPP, which includes ultrasound observations of **fetal breathing**, **movement**, **muscle tone**, and **amniotic fluid volume**, along with an **NST**, offers a comprehensive assessment of fetal status.
*contraction stress test*
- The **contraction stress test (CST)** evaluates the response of the **fetal heart rate** to uterine contractions, which temporarily reduce placental blood flow.
- A **negative CST** (no late decelerations) indicates good **fetal oxygen reserve** and is a reliable sign of **fetal well-being**.
Obstetric Anesthesia Indian Medical PG Question 3: Which volatile anesthetic agent is MOST commonly recognized for its clinically significant tocolytic effects in obstetric anesthesia?
- A. Isoflurane (Correct Answer)
- B. Sevoflurane
- C. Nitrous oxide
- D. Desflurane
Obstetric Anesthesia Explanation: ***Isoflurane***
- **Isoflurane** is well-known for its potent dose-dependent uterine relaxation (tocolytic) properties, which can be clinically useful during obstetric procedures requiring uterine quiescence, such as manual placenta removal or fetal manipulation.
- This effect is due to its ability to decrease the frequency and intensity of uterine contractions by relaxing myometrial smooth muscle.
*Sevoflurane*
- While sevoflurane does possess uterine relaxant properties, its tocolytic effect is generally considered less potent compared to isoflurane at equipotent doses.
- It is frequently favored for maintenance of anesthesia in obstetrics due to its rapid onset and offset, but its uterine relaxation is often less pronounced than that of isoflurane.
*Desflurane*
- Desflurane also causes dose-dependent uterine relaxation, but its tocolytic effects are not typically considered as significant or as commonly utilized for specific uterine relaxation needs as isoflurane.
- Its rapid pharmacokinetics make it suitable for obstetric anesthesia, but its uterine effects are generally in line with other volatile agents, with isoflurane having a more pronounced reputation for tocolysis.
*Nitrous oxide*
- **Nitrous oxide** has minimal to no direct significant uterine relaxant (tocolytic) effects, making it a common choice for analgesia during labor in sub-anesthetic concentrations.
- It does not cause the widespread smooth muscle relaxation observed with potent volatile agents, hence is not used for obstetric scenarios requiring uterine quiescence.
Obstetric Anesthesia Indian Medical PG Question 4: The Anaesthesia technique of choice in severely preeclamptic women for cesarean delivery -
- A. Spinal Anaesthesia (Correct Answer)
- B. General Anaesthesia
- C. Epidural Anaesthesia
- D. Pudendal block
Obstetric Anesthesia Explanation: ***Spinal Anaesthesia***
- **Spinal anaesthesia** is generally preferred due to its rapid onset, excellent muscle relaxation, and better hemodynamic stability compared to general anaesthesia when careful fluid management is in place.
- It avoids the risks associated with **difficult airway management** and aspiration in preeclamptic patients and minimizes fetal drug exposure.
*General Anaesthesia*
- **General anaesthesia** carries a higher risk of **rapid, unpredictable increases in blood pressure** during tracheal intubation and extubation, which can be dangerous in preeclampsia with an already compromised cardiovascular system.
- It is associated with increased risks of **aspiration**, **difficult airway**, and **postoperative respiratory complications** in preeclamptic women.
*Epidural Anaesthesia*
- While generally safe, **epidural anaesthesia** has a slower onset compared to spinal anaesthesia, which may not be ideal in emergency situations requiring rapid delivery.
- The titration of an epidural can be more challenging in patients with severe preeclampsia, where rapid changes in blood pressure need careful management.
*Pudendal block*
- A **pudendal block** provides local anaesthesia to the perineum, vulva, and lower vagina.
- It is used for pain relief during vaginal delivery and is unsuitable for a **cesarean section**, which requires anaesthesia of the abdominal wall and uterus.
Obstetric Anesthesia Indian Medical PG Question 5: Most common cause of maternal mortality in spinal anesthesia is ?
- A. Allergy to local anesthesia
- B. Nerve injury
- C. Hypotension (Correct Answer)
- D. High block
Obstetric Anesthesia Explanation: ***Hypotension***
- **Profound hypotension** due to sympathetic blockade is the most common cause of maternal mortality in spinal anesthesia.
- This can lead to **decreased placental perfusion**, fetal distress, and maternal cardiovascular collapse if not promptly managed.
*Allergy to local anesthesia*
- True allergic reactions to local anesthetics are **extremely rare**, especially to ester-type anesthetics used in spinal anesthesia.
- While possible, it is not the most common cause of maternal mortality.
*Nerve injury*
- **Direct nerve injury** during spinal anesthesia is a rare complication, usually resulting in localized neurological deficits rather than mortality.
- It does not represent the primary cause of maternal death.
*High block*
- A **high spinal block** can cause severe hypotension and respiratory compromise, which can lead to mortality.
- However, the underlying mechanism for the life-threatening aspects of a high block is often **severe hypotension** and subsequent cardiovascular collapse.
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