Interventional Pain Procedures — MCQs
Gadolinium is a contrast agent used for:
Most sensitive method of monitoring cardiovascular ischemia in the perioperative period is -
"Triangle of Petit" is a landmark for which block?
Which of the following is considered an absolute contraindication for MRI in most clinical scenarios?
Which block is described as regional anesthesia of the arm:-
A 60-year-old woman with a history of chronic back pain presents with acute-onset sharp pain radiating down the right leg. She also reports numbness and tingling in the foot. What is the best next step in management?
Most common complication of celiac plexus block:
A two month old infant has undergone a major surgical procedure. Regarding postoperative pain relief which one of the following is recommended:
Celiac plexus block all the following is true Except
Celiac plexus block all the following is true except ?
Interventional Pain Procedures Indian Medical PG Practice Questions and MCQs
Question 1: Gadolinium is a contrast agent used for:
- A. CT - angiography
- B. Bronchography
- C. MRI - Imaging (Correct Answer)
- D. Contrast Sonography
Explanation: ***MRI - Imaging*** - **Gadolinium** is a paramagnetic substance commonly used as a contrast agent in **Magnetic Resonance Imaging (MRI)**. - It works by altering the **T1 relaxation times** of protons in tissues, enhancing the signal and improving the visibility of certain structures or pathologies like **tumors** or **inflammation**. *CT - angiography* - **CT angiography** typically uses **iodine-based contrast agents**, not gadolinium, to visualize blood vessels. - Iodine contrast agents work by absorbing X-rays, making blood vessels appear bright on CT images. *Bronchography* - **Bronchography** is an older imaging technique that involved introducing an **iodinated contrast medium** directly into the bronchial tree. - It has largely been replaced by **high-resolution CT scans** for evaluating airways. *Contrast Sonography* - **Contrast-enhanced ultrasound (CEUS)**, or contrast sonography, primarily uses **microbubble contrast agents** made of inert gas. - These microbubbles enhance the reflectivity of blood, improving visualization of blood flow and organ perfusion.
Question 2: Most sensitive method of monitoring cardiovascular ischemia in the perioperative period is -
- A. NIBP
- B. ECG
- C. Pulse oximeter
- D. TEE (Correct Answer)
Explanation: ***TEE*** - **Transesophageal echocardiography (TEE)** is the most sensitive method for detecting perioperative myocardial ischemia because it can visualize **regional wall motion abnormalities** and changes in **ventricular function** much earlier than ECG. - **Ischemia** directly impairs the contractility of the affected myocardium, leading to subtle changes in wall motion that TEE can identify. *NIBP* - **Non-invasive blood pressure (NIBP)** monitoring can detect **hemodynamic changes** (like hypotension or hypertension) that may precede or accompany ischemia. - However, these changes are **non-specific** and occur relatively late, making NIBP a less sensitive indicator of early ischemia. *ECG* - **Electrocardiography (ECG)** monitors the electrical activity of the heart and can detect **ST-segment changes** indicative of ischemia. - While useful, ECG changes may appear later than wall motion abnormalities, and **silent ischemia** can be missed if the leads are not optimally placed or if the ischemia does not produce significant electrical changes. *Pulse oximeter* - A **pulse oximeter** measures **oxygen saturation** in the peripheral blood. - It is primarily used to assess **respiratory function** and tissue oxygenation, and it does not directly monitor myocardial ischemia or cardiac function.
Question 3: "Triangle of Petit" is a landmark for which block?
- A. Epidural block
- B. TAP block (Correct Answer)
- C. Spinal block
- D. Bier's block
Explanation: **TAP block** - The **Triangle of Petit** (or lumbar triangle) is an important anatomical landmark used to approximate the location for a **transversus abdominis plane (TAP) block**. - This triangle is formed by the **latissimus dorsi muscle** posteriorly, the **external oblique muscle** anteriorly, and the **iliac crest** inferiorly. *Epidural block* - An epidural block involves injecting local anesthetic into the **epidural space** surrounding the spinal cord. - Its landmarks are typically based on vertebral palpable structures, not the Triangle of Petit. *Spinal block* - A spinal block (or subarachnoid block) involves injecting local anesthetic into the **subarachnral space**, directly into the cerebrospinal fluid. - Access is gained through the dura and arachnoid membranes, with landmarks again being specific vertebral levels. *Bier's block* - Bier's block, or **intravenous regional anesthesia**, involves isolated limb anesthesia by injecting local anesthetic intravenously after exsanguination and tourniquet application. - It does not involve any specific anatomical surface landmarks like the Triangle of Petit.
Question 4: Which of the following is considered an absolute contraindication for MRI in most clinical scenarios?
- A. Claustrophobia
- B. Pacemaker (Correct Answer)
- C. Penile prosthesis
- D. Joint replacement
Explanation: ***Pacemaker*** - The strong magnetic fields and radiofrequency pulses of **MRI** can interfere with the function of a **pacemaker**, potentially causing device malfunction, dislodgement, or heating of leads, which can be life-threatening. - While some newer pacemakers are MRI-conditional, the presence of an older or non-MRI-conditional pacemaker is an **absolute contraindication** to MRI. *Claustrophobia* - **Claustrophobia** is a relative contraindication or a challenge for MRI, often managed with sedation or open MRI scanners, but it does not pose an immediate physical threat. - It affects patient comfort and compliance but is not an **absolute contraindication** in terms of safety. *Penile prosthesis* - Most modern **penile prostheses** are made of MRI-compatible materials and are generally safe for MRI. - While some older devices might cause artifacts, they do not typically pose a significant safety risk during an **MRI** scan. *Joint replacement* - **Joint replacements**, especially newer ones, are often made of non-ferromagnetic materials and are increasingly becoming MRI-safe. - While older or certain types of metallic implants can cause **image artifacts**, they are not an **absolute contraindication** for MRI unless the material is known to be ferromagnetic and prone to movement or heating.
Question 5: Which block is described as regional anesthesia of the arm:-
- A. Interscalene block
- B. Infraclavicular block
- C. Axillary block
- D. Supraclavicular brachial plexus block (Correct Answer)
Explanation: ***Supraclavicular brachial plexus block*** - The **supraclavicular block** targets the **trunks of the brachial plexus** as they exit the scalene muscles, providing comprehensive anesthesia to the entire upper limb, including the shoulder, arm, forearm, and hand. - This block is particularly effective for procedures involving the arm due to its proximal location within the brachial plexus, covering multiple nerve distributions. *Interscalene block* - An **interscalene block** primarily targets the **roots or trunks of the brachial plexus** and is typically used for shoulder and upper arm surgery, but may spare the ulnar nerve. - While it anesthetizes the arm, it is primarily chosen for more proximal procedures and may not provide complete distal arm anesthesia compared to the supraclavicular approach. *Infraclavicular block* - An **infraclavicular block** targets the **cords of the brachial plexus** and is suitable for procedures involving the elbow, forearm, and hand, providing good coverage for these areas. - While it does anesthetize the distal arm, it is more distal than the supraclavicular block and may not provide full coverage for the entire upper arm and shoulder. *Axillary block* - An **axillary block** targets the **terminal branches of the brachial plexus** in the axilla, mainly anesthetizing the forearm and hand. - This block is often used for procedures distal to the elbow and provides less comprehensive coverage for the entire upper arm and shoulder compared to more proximal blocks.
Question 6: A 60-year-old woman with a history of chronic back pain presents with acute-onset sharp pain radiating down the right leg. She also reports numbness and tingling in the foot. What is the best next step in management?
- A. Bed rest
- B. MRI of the spine (Correct Answer)
- C. X-ray of the spine
- D. Physical therapy
Explanation: ### MRI of the spine - The patient's symptoms of acute-onset sharp pain radiating down the right leg with numbness and tingling strongly suggest **radiculopathy**, likely due to **nerve root compression** from a herniated disc, stenosis, or other pathology [1]. - An **MRI of the spine** is the **most sensitive and specific imaging modality** to visualize soft tissue structures like intervertebral discs, nerve roots, and the spinal cord, allowing for accurate diagnosis and guiding further management. *Bed rest* - While historically recommended, **prolonged bed rest** is generally discouraged for acute low back pain and radiculopathy as it can lead to deconditioning and delayed recovery [2]. - **Modified activity** and early mobilization are often preferred over strict bed rest, even for severe pain [2]. *X-ray of the spine* - An **X-ray of the spine** can identify bony abnormalities like fractures, severe degenerative changes, or spondylolisthesis, but it **cannot visualize soft tissue structures** that are typically responsible for radicular symptoms, such as herniated discs or nerve root compression. - Therefore, it is not the best initial imaging choice for pinpointing the cause of the patient's neurological symptoms. *Physical therapy* - **Physical therapy** is an important component of long-term management for back pain and radiculopathy, focusing on exercises, stretching, and education to improve function and reduce pain. - However, in the setting of **acute, severe radicular symptoms** with numbness and tingling, it is crucial to first establish a definitive diagnosis through imaging to rule out more serious compression and guide appropriate therapeutic interventions.
Question 7: Most common complication of celiac plexus block:
- A. Retroperitoneal hemorrhage
- B. Intra-arterial injection
- C. Pneumothorax
- D. Postural hypotension (Correct Answer)
Explanation: ***Postural hypotension*** - This is the most common complication due to the **vasodilation** that occurs from blocking the sympathetic nerves in the celiac plexus. - It results from the temporary loss of sympathetic tone, leading to a drop in blood pressure, especially upon standing. *Retroperitoneal hemorrhage* - While possible, a retroperitoneal hemorrhage is a less common complication compared to postural hypotension. - It typically results from **trauma to blood vessels** during needle insertion, especially in patients with coagulopathies. *Pneumothorax* - Pneumothorax is a rare complication of celiac plexus block, as the procedure generally avoids the thoracic cavity. - It can occur if the needle is advanced too far superiorly or laterally, piercing the **diaphragm and pleura**. *Intra-arterial injection* - Intra-arterial injection is an uncommon but serious complication that can lead to **ischemia or vascular spasm**. - This risk is mitigated by careful aspiration before injection and the use of imaging guidance.
Question 8: A two month old infant has undergone a major surgical procedure. Regarding postoperative pain relief which one of the following is recommended:
- A. Spinal narcotics intrathecal route
- B. Intravenous narcotic infusion in lower dosage (Correct Answer)
- C. Only paracetamol suppository is adequate
- D. No medication is needed as infant does not feel pain after surgery due to immaturity of nervous system
Explanation: ***Intravenous narcotic infusion in lower dosage*** - **Intravenous narcotic infusion** provides continuous pain relief and allows for careful titration of the dose, which is crucial in infants due to their developing metabolism and increased sensitivity to opioids. - Lower dosages are recommended because infants have a **reduced capacity for drug metabolism** and excretion, making them more susceptible to side effects like respiratory depression. *Spinal narcotics intrathecal route* - While effective, the **intrathecal route** carries risks such as neurotoxicity and spinal cord injury, which are particularly concerning in infants due to their small size and developing neural structures. - The **pharmacokinetics** of intrathecal narcotics can also be unpredictable in infants, leading to potential for delayed respiratory depression. *Only paracetamol suppository is adequate* - For **major surgical procedures**, a single agent like **paracetamol** is typically insufficient to manage severe postoperative pain effectively. - While paracetamol is a useful adjunct, it lacks the potent analgesic effects of opioids needed for comprehensive pain control after significant surgery. *No medication is needed as infant does not feel pain after surgery due to immaturity of nervous system* - This statement is **incorrect** and a dangerous misconception; infants, even neonates, have a **fully developed pain pathway**, perceive pain, and require appropriate analgesia. - The **pain response** in infants can be more exaggerated due to an immature inhibitory pain system, necessitating careful and effective pain management.
Question 9: Celiac plexus block all the following is true Except
- A. Cause hypotention
- B. Can be used to provide anesthesia for intra abdominal surgery
- C. Relieved pain from gastric malignancy
- D. Can be given only by retrocrural (classic) approach (Correct Answer)
Explanation: ***Can be given only by retrocrural (classic) approach*** - The celiac plexus block can be performed using various approaches, including **retrocrural (classic)**, **transcrural**, **anterior**, and **endoscopic ultrasound (EUS)-guided** techniques. - The choice of approach depends on patient anatomy, desired outcome, and the physician's expertise, making the statement of "only" a specific approach incorrect. *Cause hypotension* - **Hypotension** is a common side effect of celiac plexus block due to the blockade of **sympathetic innervation** to the splanchnic circulation, leading to vasodilation. - This effect is often managed with intravenous fluids and vasopressors if necessary. *Can be used to provide anesthesia for intra abdominal surgery* - Celiac plexus blocks are primarily used for **analgesia** in patients with chronic abdominal pain, particularly from **visceral malignancies**, not as the sole anesthetic for major intra-abdominal surgery. - While it can provide significant pain relief, it does not induce the level of muscle relaxation or unconsciousness required for surgical anesthesia. *Relieved pain from gastric malignancy* - The celiac plexus innervates many abdominal organs, including the stomach, pancreas, and liver, making its blockade effective in relieving **visceral pain** originating from these structures. - It is a well-established intervention for managing severe **pain associated with gastric** and pancreatic malignancies.
Question 10: Celiac plexus block all the following is true except ?
- A. Can be used to provide anesthesia for intra abdominal surgery
- B. Can be given only by retrocrural (classic) approach (Correct Answer)
- C. Cause hypotention
- D. Relieved pain from gastric malignancy
Explanation: ***Can be given only by retrocrural (classic) approach*** - The celiac plexus block can be administered via several approaches, including **retrocrural (classic)**, **transaortic**, **anterior**, and **endoscopic ultrasound-guided (EUS)**, making the statement that it can *only* be given by the retrocrural approach incorrect. - The choice of approach depends on the patient's anatomy, the indication for the block, and the clinician's expertise, providing flexibility beyond a single method. *Can be used to provide anesthesia for intra abdominal surgery* - While celiac plexus blocks are primarily used for **pain management**, they do not provide complete surgical anesthesia for intra-abdominal surgery due to their limited somatic sensory coverage. - General anesthesia or epidural/spinal anesthesia is typically required for intra-abdominal surgical procedures, often supplemented by celiac plexus blocks for postoperative pain relief. *Cause hypotension* - **Hypotension** is a common adverse effect of celiac plexus block due to the blockade of sympathetic outflow to the splanchnic circulation, leading to **vasodilation** and pooling of blood. - This effect can be severe and requires careful monitoring and often pre-emptive fluid resuscitation, especially in patients with compromised cardiovascular status. *Relieved pain from gastric malignancy* - Celiac plexus block is highly effective in relieving **visceral pain** originating from upper abdominal organs, including the stomach, pancreas, liver, and gallbladder, particularly in cases of malignancy. - It works by blocking the transmission of nociceptive signals from these organs through the celiac plexus, offering significant **palliative pain relief** for patients with conditions like pancreatic or gastric cancer.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free