Emergency Obstetric Anesthesia — MCQs

10 questions

A 29-year-old G3P2 woman at 34 weeks' gestation is involved in a serious car accident, loses consciousness briefly, and presents to the emergency department awake and alert with a severe headache, abdominal, and pelvic pain. Her vital signs include a blood pressure of 150/90 mm Hg, heart rate of 120/min, temperature of 37.4°C (99.3°F), and respiratory rate of 22/min. Fetal heart rate is 155/min. Physical examination reveals minor bruises on the abdomen and limbs, blood in the vault upon vaginal inspection, and strong, frequent uterine contractions. Which of the following is most likely a complication of her current condition?

A pregnant lady with persistent variable decelerations with cervical dilatation of 6 cm is planned for emergency LSCS. Which of the following is NOT done in management while preparing patient for surgery

Which of the following statements is NOT true regarding rapid induction of anesthesia?

Which drug is commonly used for emergency intubation?

What is the anesthesia of choice for cesarean section in patients with severe pre-eclampsia?

Anaesthesia of choice for manual removal of the placenta is?

Which of the following statements is false regarding postpartum hemorrhage and pelvic hematomas?

An unconscious child is brought to the casualty. What is the correct sequence of the management?

The Anaesthesia technique of choice in severely preeclamptic women for cesarean delivery -

Q10

Which volatile anesthetic agent is MOST commonly recognized for its clinically significant tocolytic effects in obstetric anesthesia?

Emergency Obstetric Anesthesia Indian Medical PG Practice Questions and MCQs

Question 1: A 29-year-old G3P2 woman at 34 weeks' gestation is involved in a serious car accident, loses consciousness briefly, and presents to the emergency department awake and alert with a severe headache, abdominal, and pelvic pain. Her vital signs include a blood pressure of 150/90 mm Hg, heart rate of 120/min, temperature of 37.4°C (99.3°F), and respiratory rate of 22/min. Fetal heart rate is 155/min. Physical examination reveals minor bruises on the abdomen and limbs, blood in the vault upon vaginal inspection, and strong, frequent uterine contractions. Which of the following is most likely a complication of her current condition?

A. IUGR
B. Subarachnoid hemorrhage
C. Vasa previa
D. DIC (Correct Answer)

Explanation: ***DIC*** - The combination of **abruptio placentae** (suggested by trauma, pain, vaginal bleeding, and contractions) with potential severe bleeding from uterine rupture or injury from the car accident, significantly increases the risk of **Disseminated Intravascular Coagulation (DIC)**. - **DIC** is a life-threatening condition initiated by massive activation of the coagulation system, leading to widespread microthrombi formation and subsequent consumption of clotting factors and platelets, resulting in simultaneous **bleeding and thrombosis**. *IUGR* - **Intrauterine Growth Restriction (IUGR)** is a chronic complication typically developing over weeks or months, caused by placental insufficiency or fetal conditions. - It is unlikely to be an acute complication directly resulting from a traumatic event at 34 weeks gestation. *Subarachnoid hemorrhage* - While trauma can cause **subarachnoid hemorrhage**, the primary obstetric complications described (abdominal pain, vaginal bleeding, uterine contractions following trauma) point more strongly towards placental or uterine injury. - The patient's **headache** and brief loss of consciousness could be due to concussion, but the obstetric findings are more immediately concerning for distinct complications. *Vasa previa* - **Vasa previa** is an anatomical anomaly where fetal blood vessels within the membranes cross the internal cervical os, unprotected by placental tissue or Wharton's jelly. - This condition presents with painless vaginal bleeding upon rupture of membranes and **fetal distress**, usually in labor, but is not directly caused by trauma.

Question 2: A pregnant lady with persistent variable decelerations with cervical dilatation of 6 cm is planned for emergency LSCS. Which of the following is NOT done in management while preparing patient for surgery

A. O2 inhalation
B. I.V. fluid
C. Foley catheterization
D. Supine position (Correct Answer)

Explanation: ***Supine position*** - Maintaining a **supine position** in a pregnant woman can lead to **aortocaval compression**, reducing **venous return** and **cardiac output**, which compromises uterine blood flow and fetal oxygenation. - To prevent this, the patient should be placed in a **left lateral tilt** (wedge under the right hip) to displace the uterus off the great vessels. *O2 inhalation* - Administering **oxygen via face mask** increases the mother's partial pressure of oxygen (PaO2), which can improve **fetal oxygenation** and potentially alleviate fetal distress. - This is a standard and safe intervention to maximize oxygen delivery to the fetus, especially in cases of **fetal compromise** indicated by variable decelerations. *I.V. fluid* - Administering **intravenous fluids** helps maintain maternal hydration and **circulatory volume**, crucial for adequate uterine perfusion. - This can improve **placental blood flow**, potentially reducing the frequency or severity of variable decelerations by increasing amniotic fluid volume and relieving **cord compression**. *Foleys catheterisation* - **Foley catheterization** is essential before a Cesarean section to **decompress the bladder**, preventing injury during surgery and improving surgical exposure. - A full bladder can obstruct the surgical field and increases the risk of accidental incision, therefore, it is a routine pre-operative step.

Question 3: Which of the following statements is NOT true regarding rapid induction of anesthesia?

A. Suxamethonium is often used.
B. Mechanical ventilation is typically avoided before intubation.
C. Pre-oxygenation is mandatory
D. Sellick's maneuver is always required. (Correct Answer)

Explanation: ***Sellick's maneuver is always required.*** - **Sellick's maneuver**, or cricoid pressure, is applied to compress the esophagus against the vertebrae, aiming to prevent **gastric regurgitation** and aspiration during rapid sequence intubation (RSI). - While historically considered a standard component of RSI, its routine use has been increasingly questioned due to a lack of strong evidence supporting its efficacy and potential to impede glottic visualization and intubation. It is not "always" required; its application is often at the discretion of the anesthetist based on patient factors and risk assessment. *Pre-oxygenation is mandatory* - **Pre-oxygenation** is a critical step in rapid sequence induction, involving administering 100% oxygen for several minutes prior to induction. - This denitrogenates the functional residual capacity (FRC), creating an oxygen reservoir that extends the safe apnea time, thus preventing **hypoxemia** during the intubation attempt. *Suxamethonium is often used.* - **Suxamethonium** (succinylcholine) is a depolarizing neuromuscular blocker primarily used in rapid sequence intubation due to its **ultra-rapid onset** (30-60 seconds) and short duration of action (5-10 minutes). - Its rapid action facilitates quick muscle relaxation for tracheal intubation, which is crucial for minimizing the risk of aspiration in patients with a full stomach or other risk factors. *Mechanical ventilation is typically avoided before intubation.* - During rapid sequence induction, **positive pressure ventilation** with a bag-valve mask is typically avoided before intubation to prevent gastric insufflation. - Gastric insufflation can increase the risk of **regurgitation** and pulmonary aspiration of gastric contents, which is a major concern in patients undergoing RSI.

Question 4: Which drug is commonly used for emergency intubation?

A. None of the options
B. Etomidate (Correct Answer)
C. Propofol
D. Ketamine

Explanation: ***Etomidate*** - Etomidate is a **short-acting nonbenzodiazepine hypnotic** often preferred for rapid sequence intubation (RSI) due to its minimal impact on **hemodynamic stability**. - It induces **rapid unconsciousness** with a quick onset and offset, making it suitable for emergency airway management in patients who are hemodynamically compromised. *Propofol* - Propofol is a **potent intravenous anesthetic** that can cause significant **hypotension** due to vasodilation and myocardial depression. - While it provides rapid onset of sedation and amnesia, its cardiovascular side effects make it less ideal for patients with **unstable hemodynamics** during emergency intubation. *Ketamine* - Ketamine is a **dissociative anesthetic** that causes a cataleptic state, amnesia, and analgesia, often leading to **bronchodilation** and cardiovascular stimulation. - While useful in patients with **reactive airway disease** or hypotension, it can increase intracranial pressure and may induce sympathetic stimulation, which might not be ideal for all emergency intubation scenarios. *None of the options* - This option is incorrect because **Etomidate is a commonly used drug** for emergency intubation, particularly where hemodynamic stability is a concern. - Other agents are also used but Etomidate is a clear clinical choice in many situations.

Question 5: What is the anesthesia of choice for cesarean section in patients with severe pre-eclampsia?

A. Epidural
B. GA
C. Spinal+epidural
D. Spinal (Correct Answer)

Explanation: ***Spinal*** - **Spinal anesthesia** is generally preferred due to its **rapid onset**, effective block, and minimal fetal exposure to drugs, which is crucial in pre-eclampsia where maternal and fetal well-being are compromised. - It provides **hemodynamic stability** and avoids the risks associated with general anesthesia in patients with severe pre-eclampsia, such as difficult airway and exaggerated pressor response to intubation. *GA* - **General anesthesia** is associated with significant maternal risks in severe pre-eclampsia, including a higher incidence of **difficult or failed intubation**, severe **hypertension** during intubation, and aspiration risks. - There is also a greater potential for **fetal depression** due to anesthetic drug transfer across the placenta. *Epidural* - While an **epidural** can be used, its **slower onset** and the need for incremental dosing make it less ideal for urgent cesarean sections compared to the rapid onset of spinal anesthesia. - It also carries a higher risk of **intravascular injection** and systemic toxicity if local anesthetics are inadvertently administered into the bloodstream. *Spinal+epidural* - A **combined spinal-epidural (CSE)** offers both rapid onset (from the spinal component) and flexibility for prolonged surgical time or post-operative pain control (from the epidural component). - However, in cases of severe pre-eclampsia, the **complexity of the procedure** and the potential for a larger drop in blood pressure with a combined block might be less favorable than a simple spinal, especially if time is critical.

Question 6: Anaesthesia of choice for manual removal of the placenta is?

A. General Anesthesia (GA)
B. Spinal Anesthesia (Correct Answer)
C. Epidural Anesthesia
D. Paracervical Block

Explanation: ***Spinal Anesthesia*** - Provides **rapid onset** and dense sensory and motor block, which is ideal for a quick procedure like manual placental removal. - The **uterine atony** associated with spinal anesthesia, while a concern, is less pronounced or easier to manage than the deep relaxation often seen with general anesthesia, especially with inhaled anesthetics. *General Anesthesia (GA)* - Can lead to significant **uterine relaxation** (atony), increasing the risk of postpartum hemorrhage, especially with volatile anesthetics. - While it provides excellent pain control, the associated risks of airway management, aspiration, and deeper uterine relaxation make it less desirable as a primary choice. *Epidural Anesthesia* - Provides good analgesia but has a **slower onset** of full surgical anesthesia compared to spinal, which may be critical in an urgent situation. - While it can be titrated to achieve surgical depth, it might not provide the rapid, dense motor block required for comfortable and efficient manual removal. *Paracervical Block* - Primarily provides analgesia to the **cervix and lower uterine segment**, but offers insufficient pain relief for the fundal manipulation and full uterine exploration required during manual placental removal. - This block does not adequately anesthetize the entire uterus or provide the necessary muscle relaxation for a comfortable and safe procedure.

Question 7: Which of the following statements is false regarding postpartum hemorrhage and pelvic hematomas?

A. The vulva is the most common site for pelvic hematoma. (Correct Answer)
B. Hematomas less than 5 cm can often be managed conservatively.
C. Uterine atony is the most common cause of postpartum hemorrhage.
D. The most common artery to form a vulvar hematoma is the pudendal artery.

Explanation: ***The vulva is the most common site for pelvic hematoma.*** - While vulvar hematomas are common, the **vagina is actually the most common site** for puerperal hematomas. - **Retroperitoneal hematomas** are the least common but most dangerous type, often associated with a higher mortality rate due to delayed diagnosis. *Hematomas less than 5 cm can often be managed conservatively.* - **Small, stable hematomas** (typically less than 2-5 cm) that are not expanding can often be managed with observation, pain control, and ice packs. - Close monitoring for continued bleeding, signs of infection, or hemodynamic instability is crucial even with conservative management. *Uterine atony is the most common cause of postpartum hemorrhage.* - **Uterine atony** (failure of the uterus to contract after birth) accounts for approximately 70-80% of all cases of postpartum hemorrhage. - This condition leads to excessive bleeding from the placental site due to the inability of uterine muscle fibers to compress blood vessels effectively. *The most common artery to form a vulvar hematoma is the pudendal artery.* - Vulvar hematomas primarily arise from injury to branches of the **pudendal artery**, particularly during lacerations or episiotomies. - Trauma to the **perineum** during childbirth can cause these arteries or their venous counterparts to bleed into the surrounding loose connective tissue.

Question 8: An unconscious child is brought to the casualty. What is the correct sequence of the management?

A. Circulation, Airway, Breathing
B. Breathing, Circulation, Airway
C. Circulation, Breathing, Airway
D. Airway, Breathing, Circulation (Correct Answer)

Explanation: ***Airway, Breathing, Circulation*** - The **ABC sequence** is the cornerstone of pediatric resuscitation as per **PALS (Pediatric Advanced Life Support) guidelines** - In an unconscious child, a patent **airway** is the absolute first priority - without this, no oxygen can reach the lungs regardless of breathing effort - Once airway patency is ensured, **breathing** must be assessed and supported to provide adequate ventilation and oxygenation - Only after securing airway and breathing should **circulation** be addressed, as effective circulation without oxygenation is futile - This sequence prevents **hypoxic brain injury**, which can occur within 4-6 minutes of oxygen deprivation *Circulation, Airway, Breathing* - This violates the fundamental **ABC principle** of emergency management - Prioritizing **circulation** before establishing a patent **airway** means attempting to circulate deoxygenated blood - Without airway patency, any circulatory support will fail to deliver oxygen to vital organs, leading to **irreversible hypoxic damage** - In pediatric emergencies, respiratory failure is more common than primary cardiac arrest, making airway management even more critical *Breathing, Circulation, Airway* - Attempting to support **breathing** before securing the **airway** is physiologically ineffective - An obstructed airway prevents air entry despite breathing efforts or bag-mask ventilation attempts - This sequence can lead to **gastric distension, aspiration**, and worsening hypoxia - Delays in airway management increase the risk of **cardiac arrest** from prolonged hypoxemia *Circulation, Breathing, Airway* - This sequence dangerously delays **airway management**, the most time-critical intervention - In an unconscious child, airway obstruction from tongue falling back or secretions is common and immediately life-threatening - Without a patent airway, neither breathing support nor circulatory measures can prevent **brain death** from anoxia - Following this sequence contradicts all **international resuscitation guidelines** (PALS, AHA, ERC)

Question 9: 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

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.

Question 10: 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

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.

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