Perioperative Pain Management Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Perioperative Pain Management. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Perioperative Pain Management Indian Medical PG Question 1: Anaesthetic agent causing analgesia?
- A. Thiopentone
- B. Ketamine (Correct Answer)
- C. Propofol
- D. Etomidate
Perioperative Pain Management Explanation: ***Ketamine***
- Ketamine provides excellent **analgesia** by acting as an **NMDA receptor antagonist**, making it unique among commonly used intravenous anesthetics [1].
- It induces a state of **dissociative anesthesia**, where the patient is conscious but detached from painful stimuli, maintaining cardiovascular stability [1].
*Thiopentone*
- Thiopentone is a **barbiturate** that causes rapid **induction of anesthesia** and profound **sedation** but has no analgesic properties.
- Its primary action is through potentiation of GABA-A receptor activity, leading to central nervous system depression.
*Propofol*
- Propofol is a widely used intravenous anesthetic known for its rapid onset and short duration of action, but it lacks significant **analgesic effects** [3].
- It primarily works by enhancing GABA-A receptor function, leading to **sedation** and hypnosis.
*Etomidate*
- Etomidate is an intravenous anesthetic characterized by its minimal cardiovascular depression, making it suitable for patients with **hemodynamic instability**, but it provides **no analgesia** [1], [2].
- Its anesthetic effect is mediated through GABA-A receptor potentiation, resulting in rapid loss of consciousness.
Perioperative Pain Management Indian Medical PG Question 2: A patient after undergoing thoracotomy complains of severe pain. The BEST method of pain control in this patient would be:
- A. Oral morphine
- B. Diazepam rectal suppository
- C. Intercostal cryoanalgesia (Correct Answer)
- D. IV fentanyl
Perioperative Pain Management Explanation: ***Intercostal cryoanalgesia***
- **Intercostal cryoanalgesia** involves applying extreme cold to the intercostal nerves, leading to temporary nerve denervation and prolonged pain relief. This technique is particularly effective for **post-thoracotomy pain** due to its targeted action and reduced systemic side effects compared to opioids.
- The goal is to provide **long-lasting pain control** specifically at the surgical site, allowing for better respiratory mechanics and early mobilization.
*Oral morphine*
- Oral morphine can provide systemic pain relief, but its onset of action is slower, and it carries the risk of significant **sedation** and **respiratory depression**, which are major concerns in a patient who has just undergone thoracotomy.
- While effective, it may not provide optimal local pain control for incisional pain and often requires higher doses to achieve adequate relief, increasing the risk of adverse effects.
*Diazepam rectal suppository*
- Diazepam is a **benzodiazepine** primarily used for anxiety, muscle spasms, and seizures, not for severe acute surgical pain. It has **no significant analgesic properties**.
- Its sedative effects would be contraindicated after thoracotomy due to the risk of respiratory depression and masking potential neurological changes.
*IV fentanyl*
- IV fentanyl is a potent opioid with a rapid onset and short duration of action, making it useful for breakthrough pain or during immediate post-operative periods. However, it requires **continuous monitoring** and frequent re-dosing.
- Like other opioids, it carries risks of **respiratory depression**, nausea, and sedation, making it less ideal for sustained primary pain control immediately after thoracotomy where lung function is critical.
Perioperative Pain Management Indian Medical PG Question 3: All of the following can be routes of opioid administration except:
- A. Intramuscular
- B. Oral
- C. Intravenous
- D. Intradermal (Correct Answer)
Perioperative Pain Management Explanation: ***Intradermal***
- **Intradermal administration** involves injecting medication into the dermis, the layer between the epidermis and the subcutaneous tissue, and is typically used for **allergy testing** or **tuberculosis screening (PPD test)**, not for systemic opioid delivery.
- The **slow absorption rate** and **small volume capacity** of the dermal layer make it unsuitable for achieving therapeutic opioid concentrations quickly or effectively.
*Intramuscular*
- **Intramuscular (IM)** injection allows for **rapid absorption** of opioids into the bloodstream from the muscle tissue.
- It is a common route for administering **analgesics**, including opioids, especially in settings where oral administration is not feasible or faster onset is desired.
*Oral*
- **Oral (PO) administration** is a common and convenient route for many opioid formulations, allowing for **systemic absorption** through the gastrointestinal tract.
- Opioids like **oxycodone**, **hydrocodone**, and **morphine** are often prescribed as oral tablets or solutions for pain management.
*Intravenous*
- **Intravenous (IV) administration** provides the **fastest onset of action** for opioids, as the medication is directly introduced into the bloodstream.
- This route is critically important in **acute pain management**, surgical settings, and emergency situations where immediate pain relief is necessary.
Perioperative Pain Management Indian Medical PG Question 4: True about epidural opioid are all except:
- A. Act on dorsal horn substantia gelatinosa
- B. Can cause Itching
- C. Can cause respiratory depression
- D. Function of the intestine is not affected (Correct Answer)
Perioperative Pain Management Explanation: **Function of the intestine is not affected**
- **Epidural opioids** can indeed cause **constipation** and other gastrointestinal side effects by affecting opioid receptors in the **gut wall**, thus disturbing normal intestinal motility.
- The phrase "not affected" is incorrect because **opioids inherently reduce gastrointestinal motility**, leading to common side effects such as nausea, vomiting, and constipation.
*Act on dorsal horn substantia gelatinosa*
- This statement is true; **epidural opioids work primarily by binding to opioid receptors** in the **substantia gelatinosa** of the dorsal horn of the spinal cord.
- This binding **inhibits the release of neurotransmitters** like substance P, thus preventing the transmission of pain signals.
*Can cause Itching*
- **Pruritus (itching)** is a very common side effect of **epidural opioids**, often concentrated around the face and trunk.
- It results from the **activation of opioid receptors** in the central nervous system and the release of histamine.
*Can cause respiratory depression*
- **Respiratory depression** is a serious and potentially life-threatening side effect of **epidural opioids**, particularly with higher doses or systemic absorption.
- It occurs due to the **suppression of the medullary respiratory centers** in the brainstem.
Perioperative Pain Management Indian Medical PG Question 5: A 50-year-old patient with renal insufficiency was recently operated on for pyelolithotomy. Which drug is the most appropriate choice for post-operative analgesia?
- A. Diclofenac sodium
- B. Naproxen
- C. Indomethacin
- D. Acetaminophen (Correct Answer)
- E. Ketorolac
Perioperative Pain Management Explanation: ***Acetaminophen***
- **Acetaminophen** is primarily metabolized in the liver, with minimal renal excretion, making it a safer option for patients with **renal insufficiency**.
- It provides effective **analgesia** without the adverse renal effects associated with NSAIDs.
*Diclofenac sodium*
- **Diclofenac** is a non-steroidal anti-inflammatory drug (**NSAID**) that can impair renal function, especially in patients with pre-existing **renal insufficiency**, by inhibiting prostaglandin synthesis.
- Its use can lead to further **kidney damage** or exacerbate existing renal impairment.
*Naproxen*
- **Naproxen** is an **NSAID** that carries a significant risk of causing acute kidney injury in patients with **compromised renal function**.
- It reduces renal blood flow and glomerular filtration rate, making it unsuitable for this patient.
*Indomethacin*
- **Indomethacin** is a potent **NSAID** known for its adverse renal effects, including acute renal failure.
- It should be avoided in patients with **renal insufficiency** due to its potential to further decline kidney function.
*Ketorolac*
- **Ketorolac** is a potent **NSAID** commonly used for post-operative pain but is **contraindicated** in patients with renal insufficiency.
- It has significant nephrotoxic potential and can cause acute renal failure, especially in patients with pre-existing kidney disease.
Perioperative Pain Management Indian Medical PG Question 6: Primary afferent fibers secrete which nociceptive substance at the dorsal horn?
- A. Substance P (Correct Answer)
- B. Acetylcholine
- C. Norepinephrine
- D. Epinephrine
Perioperative Pain Management Explanation: ***Substance P***
- **Substance P** is a neuropeptide released by **C fibers** and **A-delta fibers** (primary afferent nociceptors) in the dorsal horn of the spinal cord.
- It acts as a **neurotransmitter** and **neuromodulator**, contributing to the transmission and amplification of pain signals.
*Acetylcholine*
- **Acetylcholine** is a primary neurotransmitter in the **neuromuscular junction** and the autonomic nervous system.
- While it has some roles in the CNS, it is not the primary nociceptive substance secreted by afferent fibers in the dorsal horn.
*Norepinephrine*
- **Norepinephrine** (noradrenaline) is a neurotransmitter involved in the **fight-or-flight response** and mood regulation.
- It can modulate pain, but it is not directly released by primary afferent fibers as a nociceptive substance in the dorsal horn.
*Epinephrine*
- **Epinephrine** (adrenaline) is a hormone and neurotransmitter primarily associated with the **sympathetic nervous system** and stress response.
- It does not serve as a direct nociceptive transmitter released by primary afferent fibers in the spinal cord.
Perioperative Pain Management Indian Medical PG Question 7: Which of the following is the FIRST-LINE antiemetic drug most commonly used for post-operative nausea and vomiting (PONV) prophylaxis?
- A. Lorazepam
- B. Metoclopramide
- C. Promethazine
- D. Ondansetron (Correct Answer)
Perioperative Pain Management Explanation: ***Ondansetron***
- **Ondansetron** is a **5-HT3 receptor antagonist** and is considered a first-line agent due to its high efficacy and favorable side effect profile in preventing PONV.
- It works by blocking serotonin receptors in the **chemoreceptor trigger zone** and the **gastrointestinal tract**, reducing the sensation of nausea and vomiting.
*Lorazepam*
- **Lorazepam** is a **benzodiazepine** primarily used for its **anxiolytic** and **sedative effects**, and sometimes as an adjunct for refractory nausea, but not as a first-line antiemetic for PONV prophylaxis.
- While it can help indirectly by reducing anxiety, it does not directly target the key pathways involved in PONV as effectively as 5-HT3 antagonists.
*Phenytoin*
- **Phenytoin** is an **anticonvulsant** medication used to prevent seizures and has no role in the direct treatment or prophylaxis of PONV.
- It primarily acts on voltage-gated sodium channels in neurons and does not possess antiemetic properties.
*Metoclopramide*
- **Metoclopramide** is a **dopamine D2 receptor antagonist** and a **prokinetic agent** that can be used for PONV, particularly when gastric stasis is a concern.
- However, it is generally considered a second-line agent due to the risk of **extrapyramidal side effects**, especially with higher doses or prolonged use.
*Promethazine*
- **Promethazine** is a **first-generation antihistamine** with **antidopaminergic** and **anticholinergic properties** that can be effective for nausea and vomiting.
- It is often used as a rescue antiemetic or in combination therapy, but its sedative effects and potential for extrapyramidal symptoms make it less preferable as a first-line prophylactic agent compared to ondansetron.
Perioperative Pain Management Indian Medical PG 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
Perioperative Pain Management 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.
Perioperative Pain Management Indian Medical PG 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)
Perioperative Pain Management 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.
Perioperative Pain Management Indian Medical PG Question 10: A patient delivered at home with a complete perineal tear came to the hospital after 2 weeks. What is the most appropriate management for this patient?
- A. Repair 6 weeks post-delivery
- B. Repair 3 months post-delivery (Correct Answer)
- C. Repair within 1-2 weeks post-delivery
- D. Repair 3 weeks post-delivery
Perioperative Pain Management Explanation: ***Repair 3 months post-delivery***
- When a patient presents at **2 weeks post-delivery** with an **unrepaired complete perineal tear** (3rd or 4th degree), the optimal management is **delayed secondary repair at 3-6 months**.
- At 2 weeks, the acute repair window has passed, and immediate repair carries high risks of **infection**, **wound breakdown**, and **poor healing** due to tissue edema, friability, and ongoing inflammatory changes.
- Waiting **3 months** allows complete **resolution of inflammation**, **tissue maturation**, better **vascularization**, and optimal conditions for **secondary repair** with improved functional outcomes including continence.
- This is the standard recommended approach per **RCOG** and **ACOG** guidelines for delayed presentation of complete perineal tears.
*Repair within 1-2 weeks post-delivery*
- While this would have been ideal if the patient presented immediately, she is **already at 2 weeks** when she comes to the hospital.
- Primary repair should be done within **24 hours** of delivery or as soon as possible within the first few days for best results.
- Since the patient is already at 2 weeks, this option is not feasible (cannot go back in time) and attempting repair at this point would have suboptimal outcomes.
*Repair 3 weeks post-delivery*
- At **3 weeks**, the tissues are still in a suboptimal state with ongoing inflammatory changes, edema, and risk of infection.
- This timing falls in the **"danger zone"** where repair is neither early primary repair nor properly delayed secondary repair.
- Attempting repair at this stage has higher rates of **dehiscence** and **poor functional outcomes** compared to waiting for full tissue healing.
*Repair 6 weeks post-delivery*
- While **6 weeks** is better than 3 weeks, it is still **too early** for optimal secondary repair of a complete perineal tear.
- Tissues have not fully matured, and residual inflammation may persist, compromising surgical outcomes.
- Standard practice recommends waiting **at least 3 months** (preferably 3-6 months) for best results in delayed secondary repair.
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