Combined Spinal-Epidural Anesthesia Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Combined Spinal-Epidural Anesthesia. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 1: All of the following are complications of epidural anaesthesia, EXCEPT:
- A. Urinary retention
- B. Total spinal analgesia
- C. Hypopnoea
- D. Hypertension (Correct Answer)
Combined Spinal-Epidural Anesthesia Explanation: ***Hypertension***
- Epidural anesthesia commonly causes **vasodilation** and a subsequent drop in **blood pressure** (hypotension), not hypertension, due to sympathetic blockade.
- While hypertension can occur due to pain or anxiety during the procedure, it is not a direct physiological complication of the epidural anesthetic itself.
*Urinary retention*
- Epidural anesthesia can affect the nerves controlling the **bladder**, leading to temporary **urinary retention**.
- This is a common complication, often requiring catheterization until the epidural wears off.
*Total spinal analgesia*
- This occurs if the epidural needle inadvertently punctures the **dura** and a large dose of local anesthetic is injected into the **subarachnoid space**.
- It results in widespread **sensory and motor blockade**, potentially leading to respiratory arrest and hemodynamic collapse.
*Hypopnoea*
- High epidural blocks or accidental **intrathecal administration** can cause paralysis of **intercostal muscles** and the diaphragm.
- This can lead to **respiratory depression** (hypopnoea) or even apnea, necessitating ventilatory support.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 2: The gold standard of labor analgesia is which of the following:
- A. Continuous lumbar epidural (Correct Answer)
- B. IV opioid infusion
- C. Continuous inhalational agent
- D. Nerve block
Combined Spinal-Epidural Anesthesia Explanation: ***Continuous lumbar epidural***
- Provides the most **effective and comprehensive pain relief** for labor, blocking sensory nerves from the uterus, cervix, and perineum.
- Allows the mother to remain **awake and alert**, participate in the birth process, and can be easily titrated to maintain comfort.
*IV opioid infusion*
- Offers systemic pain relief but often causes **sedation** in both mother and baby and provides less effective pain relief compared to epidurals.
- Can lead to **respiratory depression** in the neonate if administered too close to delivery.
*Continuous inhalational agent*
- Agents like nitrous oxide offer **mild to moderate analgesia** but can cause **nausea, dizziness, and incomplete pain relief** during active labor.
- Not considered the gold standard due to its limited efficacy for severe labor pain.
*Nerve block*
- While effective for specific areas (e.g., pudendal block for perineal pain), nerve blocks are usually **surgical procedures** (e.g. cervical nerve block, paracervical block) and provide **localized pain relief only**, often not sufficient for global labor pain.
- Unlike **epidurals**, they don't provide continuous, widespread pain management for all stages of labor.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 3: What is the maximum concentration allowed for epidural block?
- A. Chlorprocaine (Correct Answer)
- B. Lidocaine
- C. Ropivacaine
- D. Bupivacaine
Combined Spinal-Epidural Anesthesia Explanation: ***Chlorprocaine***
- **Chlorprocaine** is an ester-type local anesthetic that can be safely used in higher concentrations for epidural blocks up to **3%**, due to its rapid hydrolysis by plasma pseudocholinesterase, leading to a very short half-life and reduced systemic toxicity.
- Its rapid metabolism minimizes the risk of accumulation and systemic toxicity, making it a suitable choice when a dense block is needed and a short duration of action is acceptable.
*Lidocaine*
- **Lidocaine** is an amide-type local anesthetic commonly used in epidural blocks, but its maximum concentration for this application is typically limited to **2%** to avoid systemic toxicity.
- Higher concentrations of lidocaine are associated with an increased risk of neurological and cardiovascular adverse effects.
*Ropivacaine*
- **Ropivacaine** is an amide-type local anesthetic that is less cardiotoxic than bupivacaine, with common concentrations for epidural use ranging from **0.2% to 1%**.
- Its maximum concentration is significantly lower than chlorprocaine due to its longer duration of action and potential for systemic toxicity at higher doses.
*Bupivacaine*
- **Bupivacaine** is a potent amide-type local anesthetic with a high risk of cardiotoxicity, and its maximum concentration for epidural use is generally restricted to **0.5%** or even less for continuous infusions.
- Using concentrations above this limit significantly increases the risk of severe cardiovascular complications, including arrhythmias and cardiac arrest.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 4: True about Epidural anesthesia:
- A. Given in subarachnoid space
- B. Effects start immediately
- C. C/I in coagulopathies (Correct Answer)
- D. All of the options
Combined Spinal-Epidural Anesthesia Explanation: ***C/I in coagulopathies***
- **Coagulopathy** is a **contraindication** for epidural anesthesia due to the significant risk of **epidural hematoma** formation.
- An epidural hematoma can compress the spinal cord, leading to **neurological damage** or **paralysis**.
*Given in subarachnoid space*
- Epidural anesthesia involves injecting anesthetic agents into the **epidural space**, which is superficial to the **dura mater**.
- Injection into the **subarachnoid space** is characteristic of **spinal anesthesia**, not epidural anesthesia.
*Effects start immediately*
- The onset of action for epidural anesthesia is typically **slower** compared to spinal anesthesia, usually taking **10-20 minutes**.
- This delay is due to the need for the anesthetic to diffuse across the dura and nerve roots to reach the spinal cord.
*All of the options*
- This option is incorrect because only one of the statements provided (C/I in coagulopathies) is true regarding epidural anesthesia.
- The other statements about the injection site and onset of action are false.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 5: What percentage of lignocaine is used in spinal anesthesia?
- A. 1%
- B. 5%
- C. 0.50%
- D. 2% (Correct Answer)
Combined Spinal-Epidural Anesthesia Explanation: **2%**
- **Lignocaine (lidocaine)** is a commonly used local anesthetic, and a **2% concentration** is often employed for spinal anesthesia to achieve rapid onset and reliable block.
- The 2% concentration provides sufficient potency for surgical anesthesia while balancing the risk of toxicity and neuraxial complications for spinals.
*1%*
- A **1% concentration** of lignocaine might be used for peripheral nerve blocks or local infiltration, but it is generally considered too dilute for effective and sustained spinal anesthesia.
- It would likely result in an **inadequate or short-lived block** for most surgical procedures when administered intrathecally.
*5%*
- A **5% concentration** of lignocaine in spinal anesthesia is associated with a higher risk of **transient neurological symptoms (TNS)** and other neurotoxic effects.
- While it provides a potent block, the increased neurotoxicity risk makes it less commonly used compared to lower concentrations for routine spinal anesthesia, especially in large volumes.
*0.50%*
- A **0.50% concentration** of lignocaine is generally too dilute for effective surgical spinal anesthesia.
- This concentration might be used for **epidural infusions** or very superficial local anesthesia, but it would not reliably achieve the deep sensory and motor block required for most spinal procedures.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 6: Which of the following cannot be given by epidural anaesthesia?
- A. Morphine
- B. Remifentanil (Correct Answer)
- C. Alfentanil
- D. Fentanyl
Combined Spinal-Epidural Anesthesia Explanation: ***Remifentanil***
- **Remifentanil** is specifically designed for **intravenous administration** and is rapidly metabolized by plasma esterases, making it unsuitable for epidural use.
- Due to its short half-life and rapid metabolism, epidural administration would provide inconsistent and fleeting analgesia, and its breakdown products are not inert in the epidural space, potentially causing **neurotoxicity**.
*Morphine*
- **Morphine** is a commonly used opioid for **epidural analgesia** due to its hydrophilicity, allowing for prolonged action in the cerebrospinal fluid.
- It provides effective **postoperative pain relief** and has a relatively slow onset but long duration of action when administered epidurally.
*Alfentanil*
- **Alfentanil** is a synthetic opioid that has been used for **epidural analgesia**, though less commonly than fentanyl or sufentanil, sometimes in conjunction with local anesthetics.
- It has a faster onset and shorter duration of action compared to morphine, but still provides effective **analgesia** when administered epidurally.
*Fentanyl*
- **Fentanyl** is a widely used lipophilic opioid for **epidural analgesia**, often combined with local anesthetics, for both surgical and obstetric pain.
- Its lipophilicity allows for rapid absorption and a relatively quick onset of action, providing effective **segmental analgesia**.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 7: Which is false regarding post dural puncture headache?
- A. Definitive cure is obtained with epidural blood patch
- B. Head ache is aggravated by sitting and relieved by lying down
- C. Incidence is reduced by pencil point spinal needles
- D. Longer the duration anesthesia , greater will be the chance of developing PDPH (Correct Answer)
Combined Spinal-Epidural Anesthesia Explanation: ***Longer the duration anesthesia , greater will be the chance of developing PDPH***
- This statement is **false** because the duration of epidural or spinal anesthesia does **not directly correlate** with the incidence of post-dural puncture headache (PDPH).
- PDPH is primarily caused by **cerebrospinal fluid (CSF) leakage** through the dural puncture site, which is related to needle size, type, and technique, rather than the length of time anesthetic drugs are administered.
*Definitive cure is obtained with epidural blood patch*
- An **epidural blood patch** is considered the most effective and often definitive treatment, providing relief in over 90% of cases.
- It works by injecting autologous blood into the epidural space, which then clots and seals the CSF leak.
*Head ache is aggravated by sitting and relieved by lying down*
- This is a **classic symptom** of PDPH, as CSF pressure decreases in the upright position, causing traction on pain-sensitive structures like blood vessels and nerves.
- Lying flat reduces this traction, leading to symptomatic relief.
*Incidence is reduced by pencil point spinal needles*
- **Pencil-point needles** (e.g., Sprotte or Whitacre) push aside dural fibers rather than cutting them, leading to a smaller and more self-sealing dural defect.
- This design significantly **reduces the risk** of CSF leakage and subsequent PDPH compared to cutting-tip needles (e.g., Quincke).
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 8: In spinal anesthesia, the drug is deposited between
- A. Dura and arachnoid
- B. Pia and arachnoid (Correct Answer)
- C. Dura and vertebra
- D. Into the cord substance
Combined Spinal-Epidural Anesthesia Explanation: ***Pia and arachnoid***
- Spinal anesthesia involves injecting anesthetic into the **subarachnoid space**, which is the anatomical region located between the pia mater and the arachnoid mater.
- This space contains **cerebrospinal fluid (CSF)**, allowing the anesthetic to mix and spread, blocking nerve impulses at the spinal cord roots.
*Dura and arachnoid*
- The space between the dura mater and arachnoid mater is the **subdural space**, and it is typically a potential space rather than an actual one for anesthetic injection.
- Injecting here would lead to a **subdural block**, which is distinct from spinal anesthesia and has different characteristics and risks.
*Dura and vertebra*
- The space between the dura mater and the vertebral canal is the **epidural space**.
- **Epidural anesthesia** involves injecting anesthetic into this space, but it is distinct from spinal anesthesia as the drug does not mix directly with CSF and requires a larger dose.
*Into the cord substance*
- Injecting anesthetic directly into the **spinal cord substance** (intrathecal injection into the cord) would be highly dangerous and cause severe neurological damage.
- Anesthetic drugs exert their effect by blocking nerve roots as they exit the spinal cord, not by acting directly on the cord parenchyma.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 9: Which of the following is advised for severe preeclampsia complicating cesarean delivery?
- A. Epidural anesthesia (Correct Answer)
- B. Local infiltration
- C. Spinal anesthesia
- D. Combined spinal-epidural anesthesia
Combined Spinal-Epidural Anesthesia Explanation: ***Epidural anesthesia***
- **Epidural anesthesia** allows for a **gradual decrease in sympathetic tone** and blood pressure, which is beneficial in severe preeclampsia to avoid rapid hemodynamic changes.
- It also provides excellent postoperative analgesia and can be used for **blood pressure control** if needed.
*Local infiltration*
- **Local infiltration** provides inadequate surgical anesthesia for a cesarean delivery and would be insufficient for pain management.
- It does not offer any systemic benefits or control over the hemodynamic instability often seen in severe preeclampsia.
*Spinal anesthesia*
- **Spinal anesthesia** is generally contraindicated in severe preeclampsia due to the risk of a **sudden and profound drop in blood pressure**, which can compromise placental perfusion and maternal vital signs.
- The rapid onset and intense sympathetic blockade can lead to **uncontrolled hypotension**, which is dangerous given the already compromised cardiovascular status.
*Combined spinal-epidural anesthesia*
- While **combined spinal-epidural (CSE)** offers rapid onset (spinal component) and titratability (epidural component), the **spinal component still carries the risk of significant hypotension**, similar to spinal anesthesia alone.
- The initial rapid drop in blood pressure from the spinal component can be detrimental in a patient with severe preeclampsia, despite the subsequent epidural control.
Combined Spinal-Epidural Anesthesia Indian Medical PG Question 10: Which is not true about spinal anesthesia?
- A. Useful for lower limb surgery
- B. It produces more hemodynamic alteration than epidural anesthesia
- C. Produces complete sensory and motor paralysis below the level (Correct Answer)
- D. Autonomic fibers are affected above the sensory level
Combined Spinal-Epidural Anesthesia Explanation: ***Produces complete sensory and motor paralysis below the level***
- While spinal anesthesia produces significant sensory and motor blockade, it is rarely a **complete paralysis** below the level of injection, especially in terms of all muscle groups and deep sensation.
- The degree of blockade depends on the **dose of anesthetic**, the patient's individual anatomy, and the spread of the drug within the cerebrospinal fluid, leading to a variable rather than absolute "complete" paralysis.
*Useful for lower limb surgery*
- Spinal anesthesia is **highly effective** and commonly used for lower limb surgeries as it provides excellent surgical anesthesia and postoperative analgesia.
- It targets the nerve roots innervating the lower extremities, successfully blocking sensation and motor function, which is ideal for procedures like **knee or hip replacements**.
*It produces more hemodynamic alteration than epidural anesthesia*
- Spinal anesthesia typically causes a more **rapid and profound sympathetic blockade** than epidural anesthesia, due to direct and rapid diffusion of local anesthetic into the cerebrospinal fluid (CSF).
- This rapid blockade often leads to a more significant and faster decrease in **blood pressure and heart rate** due to widespread vasodilation and reduced venous return.
*Autonomic fibers are affected above the sensory level*
- Sympathetic (autonomic) fibers are typically smaller and unmyelinated, making them **more susceptible to local anesthetic blockade** than sensory or motor fibers.
- Therefore, the **sympathetic blockade** often extends two to three dermatomes higher than the sensory block, resulting in vasodilation and potential hemodynamic changes in areas above the perceived sensory level.
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