Postoperative Pain Management — MCQs
Anaesthetic agent causing analgesia?
"Triangle of Petit" is a landmark for which block?
What is the name of the nerve block technique shown in the image?
Which is the intravenous anesthetic agent that contributes to good analgesia?
Which of the following anesthetic agents have good analgesic property? a) Ketamine b) Nitrous oxide c) Thiopentone d) Propofol e) Midazolam
Which of the following cannot be given by epidural anaesthesia?
In a patient with head injury, eye opening is seen with painful stimulus, localizes the pain and there is inappropriate verbal response. What would be the score on Glasgow coma scale:
A two month old infant has undergone a major surgical procedure. Regarding postoperative pain relief which one of the following is recommended:
Following are the features of persistent postoperative pain EXCEPT:
All of the following drugs increase the risk of postoperative nausea and vomiting after squint surgery in children except?
Postoperative Pain Management Indian Medical PG Practice Questions and MCQs
Question 1: Anaesthetic agent causing analgesia?
- A. Thiopentone
- B. Ketamine (Correct Answer)
- C. Propofol
- D. Etomidate
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.
Question 2: "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 3: What is the name of the nerve block technique shown in the image?
- A. Intra-arterial anesthesia (Correct Answer)
- B. Bier's block
- C. Regional anesthesia
- D. Axillary block
Explanation: ***Intra-arterial anesthesia*** - The image shows a **cannula inserted directly into an artery**, indicated by the blood reflux and the context of anesthesia, suggesting direct drug delivery into the arterial system. - This method is used for specific types of regional pain management or diagnostic procedures where direct arterial access is required for **localized drug distribution**. *Bier's block* - A Bier's block, or **intravenous regional anesthesia**, involves injecting local anesthetic into a **vein** in an extremity after it has been exsanguinated and isolated by a tourniquet. - The image clearly shows a **bright red blood flash**, characteristic of arterial cannulation, not venous. *Regional anesthesia* - This is a broad term referring to the **anesthesia of a specific region** of the body and encompasses various techniques. - While intra-arterial anesthesia is a type of regional anesthesia, "regional anesthesia" itself is too general to specifically describe the technique shown. *Axillary block* - An **axillary block** is a type of peripheral nerve block targeting the brachial plexus in the axilla to anesthetize the arm. - The image does not depict the axillary region or the characteristic needle placement for an axillary block; instead, it shows direct vascular access.
Question 4: Which is the intravenous anesthetic agent that contributes to good analgesia?
- A. Ketamine (Correct Answer)
- B. Thiopentone
- C. Propofol
- D. Etomidate
Explanation: ***Ketamine*** - **Ketamine** is unique among intravenous anesthetics for its significant **analgesic properties**, primarily acting as an **NMDA receptor antagonist**. - It produces a state of **dissociative anesthesia**, where the patient appears "awake" but is unresponsive to pain. *Thiopentone* - **Thiopentone** is a barbiturate that induces rapid unconsciousness but offers no significant **analgesia**. - It works by potentiation of **GABA-A receptors** leading to central nervous system depression. *Propofol* - **Propofol** is a widely used intravenous anesthetic for induction and maintenance, providing rapid onset and recovery, but it lacks **analgesic effects**. - Its mechanism of action also involves potentiation of **GABA-A receptors**. *Etomidate* - **Etomidate** is an intravenous anesthetic known for its **cardiovascular stability**, making it suitable for patients with cardiac compromise, but it provides no analgesia. - It is another **GABA-A receptor agonist** that causes rapid induction of anesthesia.
Question 5: Which of the following anesthetic agents have good analgesic property? a) Ketamine b) Nitrous oxide c) Thiopentone d) Propofol e) Midazolam
- A. Ketamine and Nitrous oxide (Correct Answer)
- B. Ketamine only
- C. Nitrous oxide and Thiopentone
- D. Ketamine and Propofol
- E. Midazolam only
Explanation: ***Ketamine and Nitrous oxide*** - **Ketamine** is a dissociative anesthetic with potent **analgesic properties** secondary to its action as an **NMDA receptor antagonist**. - **Nitrous oxide** is an inhalational anesthetic known for its mild to moderate **analgesic effects**, making it useful for sedation and pain relief. *Ketamine only* - While **ketamine** has excellent analgesic properties, this option is incomplete as **nitrous oxide** also contributes significant analgesia among the choices. - Excluding other agents with analgesic properties makes this option less comprehensive than the correct answer. *Ketamine and Propofol* - **Ketamine** possesses strong analgesic effects, but **propofol** is a sedative-hypnotic agent with no significant intrinsic **analgesic properties**. - Propofol provides anesthesia and sedation but typically requires co-administration with opioids for pain control. *Nitrous oxide and Thiopentone* - **Nitrous oxide** provides analgesia, but **thiopentone** (a barbiturate) is primarily an anesthetic and sedative with **no significant analgesic properties**. - Thiopentone can induce unconsciousness rapidly but does not relieve pain. *Midazolam only* - **Midazolam** is a benzodiazepine primarily used for sedation, anxiolysis, and amnesia, with **no intrinsic analgesic properties**. - Its effects can reduce stress and perception of pain, but it does not directly act as an analgesic.
Question 6: 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 7: In a patient with head injury, eye opening is seen with painful stimulus, localizes the pain and there is inappropriate verbal response. What would be the score on Glasgow coma scale:
- A. 9
- B. 8
- C. 11
- D. 10 (Correct Answer)
Explanation: ***10*** - **Eye Opening (E)**: **2** (due to painful stimulus) - **Verbal Response (V)**: **3** (due to inappropriate verbal response) - **Motor Response (M)**: **5** (due to localizing pain) - The total GCS score is calculated by summing these individual scores: 2 + 3 + 5 = **10**. *9* - This score might arise from different combinations, for instance, if the motor response was only withdrawal from pain instead of localization. - Withdrawal from pain for motor response is rated as **4**, making total score 2+3+4 = 9 *8* - This score could result from even lower responses, such as eye opening to pain (2), incomprehensible sounds (2), and withdrawal from pain (4). - This might reflect more severe neurological impairment. *11* - A score of 11 would imply better responses in one or more categories. For example in eye opening, verbal or motor response respectively. - Example: Eye opening to pain (2) + Confused conversation (4) + Localizing pain (5) = 11.
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: Following are the features of persistent postoperative pain EXCEPT:
- A. Pain from pre-surgical problem is excluded
- B. Pain present for at least 3 months (Correct Answer)
- C. Pain where other causes are excluded
- D. Pain that develops after surgical procedure
Explanation: *Pain present for at least 3 months* - This statement is an **incorrect** feature of persistent postoperative pain. The diagnostic criteria for persistent postoperative pain typically define it as pain lasting for at least **2 months** after surgery. - The definition requires a minimum duration of 2 months, not 3 months, for the pain to be considered chronic or persistent. **Pain from pre-surgical problem is excluded** - Persistent postoperative pain refers to new or increased pain directly attributable to the surgical procedure itself, excluding the original pain condition. - This criterion ensures that the **chronic pain** being evaluated is a consequence of the surgery and not a continuation or recurrence of the initial problem. *Pain where other causes are excluded* - This is a key diagnostic criterion, as it ensures that the pain is not due to other independent medical conditions, infections, or surgical complications. - Excluding other causes helps to confirm that the persistent pain syndrome is directly related to the **surgical intervention**. *Pain that develops after surgical procedure* - The pain must have developed or significantly increased in intensity after the surgical procedure for it to be considered persistent postoperative pain. - This distinguishes it from pre-existing pain conditions that may be ongoing but are not directly linked to the **surgical trauma**.
Question 10: All of the following drugs increase the risk of postoperative nausea and vomiting after squint surgery in children except?
- A. Halothane
- B. Propofol (Correct Answer)
- C. Nitrous Oxide
- D. Opioids
Explanation: ***Propofol*** - Propofol is known to have **antiemetic properties** and is often used to reduce the incidence of postoperative nausea and vomiting (PONV). - Its mechanism involves modulating **GABA-A receptors** and potentially other pathways that suppress emetic responses. *Halothane* - **Inhalational anesthetics** like halothane are a significant risk factor for PONV, particularly in children and following surgeries like squint repair. - They tend to increase PONV by directly stimulating the **chemoreceptor trigger zone** and altering gut motility. *Opioids* - Opioids, commonly used for postoperative pain control, are a well-known cause of **nausea and vomiting**. - They activate **opioid receptors** in the chemoreceptor trigger zone and the gastrointestinal tract, leading to emesis and delayed gastric emptying. *Nitrous Oxide* - The use of **nitrous oxide** as part of a general anesthetic regimen has been consistently associated with an increased risk of PONV. - It is believed to contribute to PONV by increasing the risk of **bowel distension** and stimulating neurotransmitter release involved in emesis.
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