Epidural Anesthesia — MCQs
Best site for administering spinal anesthesia is the intervertebral space between.
In spinal anesthesia, the needle is pierced up to which space?
Where is the local anesthetic introduced in spinal anesthesia?
Which of the following cannot be given by epidural anaesthesia?
In spinal anesthesia, the drug is deposited between
All of the following are complications of epidural anaesthesia, EXCEPT:
Which is false regarding post dural puncture headache?
Best treatment for relieving pain during intrapartum period is:
Which is not true about spinal anesthesia?
Which of the following is advised for severe preeclampsia complicating cesarean delivery?
Epidural Anesthesia Indian Medical PG Practice Questions and MCQs
Question 1: Best site for administering spinal anesthesia is the intervertebral space between.
- A. L1 - L2
- B. L2 - L3
- C. L3 - L4 (Correct Answer)
- D. L5 - S1
Explanation: ***L3 - L4*** - The **spinal cord** typically ends at the level of **L1-L2** in adults, making the L3-L4 intervertebral space a safe choice to avoid inadvertent cord injury. - This interspace is easily identified by drawing an imaginary line between the highest points of the **iliac crests**, which usually intersects the L4 vertebra or the L3-L4 interspace. *L1 - L2* - This interspace is generally considered too high for routine spinal anesthesia due to the risk of directly puncturing the **spinal cord**, which often extends to this level in adults. - Puncturing the spinal cord can lead to severe neurological complications, so it is usually avoided. *L2 - L3* - While safer than L1-L2, the **L2-L3 interspace** is still relatively high and carries a slightly increased risk of spinal cord injury compared to lower levels. - The **L3-L4** or **L4-L5** interspaces are generally preferred as they offer a wider margin of safety. *L5 - S1* - The **L5-S1 interspace** is often difficult to access due to the angulation of the **vertebrae** and the presence of the **iliac crests**, making needle insertion challenging. - While anatomically safe in terms of spinal cord termination, the technical difficulty makes it a less preferred site for routine lumbar punctures or spinal anesthesia.
Question 2: In spinal anesthesia, the needle is pierced up to which space?
- A. Subarachnoid space (Correct Answer)
- B. Intrathecal space
- C. Epidural space
- D. Subdural space
Explanation: ***Subarachnoid space*** - In **spinal anesthesia**, the anesthetic agent is injected directly into the **cerebrospinal fluid (CSF)**, which is located in the subarachnoid space. - This space is targeted to achieve rapid and widespread blockade of spinal nerves, leading to anesthesia and paralysis below the level of injection. *Epidural space* - The **epidural space** is located outside the **dura mater** and contains fat and blood vessels; it is targeted in **epidural anesthesia**, not spinal anesthesia. - Anesthetic agents in the epidural space provide a slower onset and a more segmental block compared to spinal anesthesia. *Intrathecal space* - The term **intrathecal space** broadly refers to the space containing CSF, which includes the subarachnoid space, but is a less precise anatomical term for the site of injection in spinal anesthesia. - While technically correct in referring to an injection into the CSF, "subarachnoid space" is the specific anatomical term for where the needle tip rests. *Subdural space* - The **subdural space** is a potential space between the **dura mater** and the **arachnoid mater**; it is not the intended target for either spinal or epidural anesthesia. - Accidental injection into the subdural space during spinal or epidural procedures can lead to an unpredictable block with delayed onset and variable spread.
Question 3: Where is the local anesthetic introduced in spinal anesthesia?
- A. Dura and pia
- B. Between ligamentum flavum and dura
- C. Directly into cord
- D. Subarachnoid space (Correct Answer)
Explanation: ***Subarachnoid space*** - In **spinal anesthesia**, the local anesthetic is injected directly into the **subarachnoid space**, which contains **cerebrospinal fluid (CSF)** and surrounds the spinal cord. - This allows the anesthetic to directly block nerve roots, producing rapid and profound **sensory and motor blockade**. *Dura and pia* - The **dura mater** is the outermost membrane covering the spinal cord, and the **pia mater** is the innermost. The anesthetic is injected *between* the arachnoid and pia, not directly into these membranes. - Injecting into the dura itself would be an **intradural injection** but not the target for spinal anesthesia, and injecting into the pia is not feasible or desired. *Between ligamentum flavum and dura* - This describes the **epidural space**, which is where **epidural anesthesia** is administered. - While it's a common regional anesthetic technique, it is distinct from **spinal anesthesia** due to the different site of drug delivery and resulting pharmacological effects. *Directly into cord* - Injecting anesthetic directly into the **spinal cord** would cause severe and potentially irreversible neurological damage. - This is a highly dangerous and avoided procedure in all forms of regional anesthesia.
Question 4: Which of the following cannot be given by epidural anaesthesia?
- A. Morphine
- B. Remifentanil (Correct Answer)
- C. Alfentanil
- D. Fentanyl
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**.
Question 5: 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
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.
Question 6: All of the following are complications of epidural anaesthesia, EXCEPT:
- A. Urinary retention
- B. Total spinal analgesia
- C. Hypopnoea
- D. Hypertension (Correct Answer)
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.
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)
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).
Question 8: Best treatment for relieving pain during intrapartum period is:
- A. Epidural anesthesia (Correct Answer)
- B. General Anesthesia
- C. Spinal anesthesia
- D. IV ketamine
Explanation: ***Epidural anesthesia*** - Provides **continuous pain relief** during labor, allowing mobility and control over medication dosage through patient-controlled epidural analgesia (PCEA). - It is effective for both vaginal and cesarean deliveries, offering superior pain control compared to other methods while maintaining maternal consciousness. *General Anesthesia* - Involves a **complete loss of consciousness** and is primarily reserved for emergency cesarean sections due to its associated risks for both mother and baby. - It is unsuitable for routine labor pain management as it prevents maternal participation and response during delivery. *Spinal anesthesia* - Provides **rapid, intense pain relief** but is typically a single-shot injection with a shorter duration of action compared to epidural anesthesia. - It is often used for planned cesarean sections or for a rapid, profound block during the late stages of labor, but it does not allow for long-term, dynamic pain management like an epidural. *IV ketamine* - Can be used for pain relief in lower doses, but it can cause **sedation, hallucinations, and dysphoria**, which are undesirable during labor. - While it's a potent analgesic, its side effect profile makes it a less favorable choice than regional anesthesia for routine intrapartum pain relief.
Question 9: 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
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.
Question 10: 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
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.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free