Patient-Controlled Analgesia Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Patient-Controlled Analgesia. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Patient-Controlled Analgesia Indian Medical PG Question 1: Which of the following anesthetic drugs is contraindicated in chronic renal failure?
- A. Atracurium
- B. Fentanyl
- C. Pethidine (Correct Answer)
- D. Morphine
Patient-Controlled Analgesia Explanation: ***Pethidine***
- **Pethidine** is contraindicated in chronic renal failure due to its active metabolite, **normeperidine**, which is eliminated renally.
- Accumulation of **normeperidine** can lead to **central nervous system (CNS) toxicity**, including seizures, tremors, and hyperreflexia.
*Atracurium*
- **Atracurium** undergoes **Hofmann elimination** and **ester hydrolysis**, which are independent of renal or hepatic function.
- This makes it a relatively safe choice for patients with **renal impairment**.
*Fentanyl*
- **Fentanyl** is primarily metabolized by the liver, with its metabolites being inactive.
- While some dose adjustment may be considered in severe renal failure, it is generally **safe** for use in patients with chronic renal impairment as its metabolites are inactive.
*Morphine*
- **Morphine** is metabolized in the liver to **morphine-3-glucuronide (M3G)** and **morphine-6-glucuronide (M6G)**, both of which are renally excreted.
- **M6G** is an active metabolite with potent analgesic effects, and its accumulation in renal failure can cause **prolonged sedation** and **respiratory depression**. While significant caution and dose reduction are needed, it's not strictly contraindicated in the same way pethidine is due to the more neurotoxic nature of normeperidine.
Patient-Controlled Analgesia Indian Medical PG Question 2: In extraction, the best time to administer analgesics is:
- A. Prior to the procedure (Correct Answer)
- B. After anaesthesia has worn off
- C. When pain is moderate to severe
- D. Just before anaesthesia wears off
Patient-Controlled Analgesia Explanation: ***Prior to the procedure***
- Administering analgesics **preemptively** helps to reduce the overall perception of pain post-operatively by blocking pain pathways before they are fully activated.
- This approach is known as **preemptive analgesia** and has been shown to reduce post-operative pain intensity and analgesic consumption.
*After anaesthesia has worn off*
- Waiting until the anesthesia has worn off means the patient will likely experience the onset of significant pain, making it harder to control effectively.
- This approach is reactive rather than proactive, and does not leverage the benefits of **preemptive pain management**.
*When pain is moderate to severe*
- At this point, the pain is already established and may be more difficult to manage, requiring higher doses or stronger analgesics.
- **Pain management** is more effective when initiated before pain becomes severe, preventing the sensitization of pain pathways.
*Just before anaesthesia wears off*
- While this is better than waiting until the anesthesia has completely worn off, it still misses the opportunity for **preemptive analgesia**.
- The pain pathways may already be activated or becoming sensitized as the anesthetic effect diminishes, making it less effective than administering prior to the procedure.
Patient-Controlled Analgesia Indian Medical PG Question 3: 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)
Patient-Controlled Analgesia 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.
Patient-Controlled Analgesia Indian Medical PG Question 4: Which opioid drug is effectively administered via the transbuccal route?
- A. Sulfentanil
- B. Remifentanil
- C. Fentanyl (Correct Answer)
- D. Alfentanil
Patient-Controlled Analgesia Explanation: ***Fentanyl***
- **Fentanyl** is a potent, **lipophilic opioid** that is well-absorbed through mucous membranes, making it suitable for **transbuccal administration**.
- Its high potency and rapid onset of action when administered transbuccally make it useful for breakthrough pain or rapid analgesia.
*Sulfentanil*
- While also a potent opioid, **sulfentanil** is primarily used intravenously for anesthesia and is not commonly formulated or administered via the transbuccal route.
- Its chemical properties and pharmacokinetic profile do not lend themselves as readily to transbuccal absorption compared to fentanyl for practical clinical use.
*Remifentanil*
- **Remifentanil** is an **ultra-short-acting opioid** metabolized by plasma esterases, making it ideal for continuous intravenous infusions where rapid offset is desired.
- Its rapid metabolism and specific pharmacokinetic properties make it unsuitable for transbuccal extended release or sustained absorption.
*Alfentanil*
- **Alfentanil** is a short-acting opioid predominantly used intravenously for induction and maintenance of anesthesia.
- Although it has a rapid onset, it is not optimized or commonly utilized for transbuccal administration due to its lower lipophilicity and different absorption characteristics compared to fentanyl.
Patient-Controlled Analgesia Indian Medical PG Question 5: What are the advantages associated with the use of ketamine?
- A. Rapid onset of anesthesia and analgesia
- B. Bronchodilation and preserved airway reflexes
- C. Cardiovascular stability with minimal respiratory depression
- D. All of the above (Correct Answer)
Patient-Controlled Analgesia Explanation: ***All of the above***
- Ketamine provides a unique combination of **rapid onset of anesthesia**, potent **analgesia**, and desirable physiological effects, making it versatile for various clinical scenarios.
- Its ability to induce **dissociative anesthesia** while maintaining spontaneous respiration and cardiovascular stability distinguishes it from many other anesthetic agents.
*Rapid onset of anesthesia and analgesia*
- This is a key advantage, as ketamine quickly achieves an anesthetic state and provides robust pain relief.
- Its rapid action allows for efficient induction and management in emergency settings or procedures requiring prompt intervention.
*Bronchodilation and preserved airway reflexes*
- Ketamine's **bronchodilatory effect** makes it a favorable choice in patients with reactive airway diseases like asthma.
- The **preservation of airway reflexes** helps protect against aspiration, which is a significant benefit compared to other anesthetics that depress these reflexes.
*Cardiovascular stability with minimal respiratory depression*
- Ketamine typically causes an increase in **heart rate and blood pressure**, contributing to cardiovascular stability, especially in patients with compromised hemodynamics.
- Compared to many other anesthetics, ketamine causes **minimal respiratory depression**, maintaining spontaneous breathing and reducing the need for mechanical ventilation.
Patient-Controlled Analgesia Indian Medical PG Question 6: In the initial management of a hemodynamically unstable polytrauma patient, what is the recommended initial crystalloid bolus dose of Ringer's lactate for assessment and stabilization?
- A. 2000 ml Ringer's lactate bolus
- B. 1000 ml Ringer's lactate bolus, then regulated by clinical indicators (Correct Answer)
- C. 250 ml Ringer's lactate bolus
- D. 500 ml Ringer's lactate bolus, then regulated by clinical indicators
Patient-Controlled Analgesia Explanation: ***1000 ml Ringer's lactate bolus, then regulated by clinical indicators***
- For **hemodynamically unstable** polytrauma patients, the initial recommended crystalloid bolus is typically **1 liter (1000 mL)** of Ringer's lactate.
- This initial bolus allows for rapid assessment of the patient's response and guides subsequent fluid management based on **clinical indicators** such as blood pressure, heart rate, and urine output, avoiding over-resuscitation.
*2000 ml Ringer's lactate bolus*
- A **2000 ml bolus** is generally considered too large for an initial dose in trauma, as it can lead to **dilutional coagulopathy**, worsening hemorrhage, and **abnormal fluid shifts**, especially in cases where definitive hemorrhage control is not yet achieved.
- Excessive fluid administration can lead to complications such as **abdominal compartment syndrome** and **acute respiratory distress syndrome (ARDS)**.
*250 ml Ringer's lactate bolus*
- A **250 ml bolus** is generally too small to effectively address **hemodynamic instability** in a polytrauma patient, offering insufficient volume to significantly improve circulation or organ perfusion.
- While small boluses might be used in specific situations (e.g., small children or patients with cardiac comorbidities), this dose is not adequate for initial resuscitation in a severely unstable adult trauma patient.
*500 ml Ringer's lactate bolus, then regulated by clinical indicators*
- While **500 mL** is a common bolus size in other medical settings, it may be insufficient for the initial resuscitation of a **hemodynamically unstable adult polytrauma patient**.
- Current trauma guidelines often recommend a larger initial bolus (e.g., 1000 mL) to gain a more immediate and measurable hemodynamic response for assessment.
Patient-Controlled Analgesia Indian Medical PG Question 7: All are management of PDPH except-
- A. Stool softeners (Correct Answer)
- B. Analgesic + caffeine
- C. Intravenous / oral fluids
- D. Upright position
Patient-Controlled Analgesia Explanation: ***Stool softeners***
- While **stool softeners** may be prescribed to prevent **straining** in patients experiencing PDPH, they do not directly treat the underlying cause or symptoms of PDPH.
- The primary goal of PDPH management is to re-establish **CSF pressure** and relieve headache, which stool softeners do not achieve.
*Analgesic + caffeine*
- **Caffeine** is a common component of PDPH management as it causes **cerebral vasoconstriction**, which can help alleviate the headache.
- **Analgesics** (e.g., NSAIDs, opioids) are used to manage the pain associated with PDPH.
*Intravenous / oral fluids*
- Increasing **fluid intake**, both oral and intravenous, helps to promote **CSF production** and potentially increase intracranial pressure, thereby alleviating PDPH symptoms.
- This is a supportive measure for rehydration and to potentially restore **CSF volume**.
*Upright position*
- An **upright position** typically **worsens** PDPH symptoms because it increases the gravitational pull on the CSF, further lowering intracranial pressure.
- Patients with PDPH are usually advised to maintain a **supine (flat)** position to minimize headache severity.
Patient-Controlled Analgesia Indian Medical PG Question 8: Which of the following pain medications requires the MOST caution in a patient with a history of opioid addiction?
- A. Morphine (Correct Answer)
- B. Oxycodone
- C. Methadone
- D. Buprenorphine
Patient-Controlled Analgesia Explanation: ***Morphine***
- Morphine is a **full mu-opioid agonist** with the highest potential for **abuse, dependence, and relapse** in patients with a history of opioid addiction due to its strong **euphoric effects**.
- It carries the greatest risk of triggering **addictive behaviors** and relapse in recovering patients, making it require the MOST caution in this population.
- Use should be avoided if possible, or limited to short-term use under strict supervision with alternative analgesics preferred.
*Oxycodone*
- Oxycodone is another **potent full opioid agonist** with very high abuse potential, nearly equivalent to morphine.
- While requiring extreme caution, morphine remains the prototypical high-risk opioid in addiction-prone patients.
*Methadone*
- Methadone is a **long-acting full opioid agonist** used in opioid maintenance therapy with significant abuse potential.
- However, when used appropriately in supervised programs, it has a role in addiction treatment, though acute pain prescribing requires caution due to its **long half-life and QTc prolongation risk**.
*Buprenorphine*
- Buprenorphine is a **partial mu-opioid agonist** with a **ceiling effect** that limits respiratory depression and euphoria.
- It is the **standard medication for opioid use disorder treatment** and has LOWER abuse potential than full agonists.
- While it requires careful timing to avoid precipitated withdrawal in opioid-dependent patients, it is actually SAFER than full agonists in patients with addiction history due to reduced relapse risk.
Patient-Controlled Analgesia Indian Medical PG Question 9: Which of the following anaesthetic agent lacks analgesic effect?
A) N2O
B) Thiopentone
C) Methohexitone
D) Ketamine
E) Fentanyl
- A. N2O
- B. Methohexitone
- C. Ketamine
- D. Fentanyl
- E. Thiopentone (Correct Answer)
Patient-Controlled Analgesia Explanation: ***Thiopentone***
- Thiopentone is a **barbiturate** anesthetic primarily used for inducing anesthesia.
- It provides significant **hypnosis** and sedation but lacks intrinsic **analgesic properties**, meaning it does not relieve pain.
*N2O*
- **Nitrous oxide** (N2O) is an inhalation anesthetic that provides good **analgesia** at sub-anesthetic concentrations.
- It is often used as an adjunct to other anesthetic agents to enhance pain relief during procedures.
*Methohexitone*
- Methohexitone is another **barbiturate** similar to thiopentone, used for induction of anesthesia.
- While it provides rapid **hypnosis**, it also lacks significant **analgesic effects**.
*Ketamine*
- Ketamine is a **dissociative anesthetic** known for its potent **analgesic properties**.
- It works by blocking **NMDA receptors**, providing pain relief even at sub-anesthetic doses.
*Fentanyl*
- Fentanyl is a powerful **opioid analgesic** that is commonly used in anesthesia for its strong pain-relieving effects.
- It acts on **opioid receptors** in the central nervous system to reduce pain perception.
Patient-Controlled Analgesia Indian Medical PG Question 10: 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
Patient-Controlled Analgesia 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.
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