Sedation and Analgesia in ICU — MCQs

10 questions

The Children's Hospital of Eastern Ontario Pain Scale (CHEOPS) for rating postoperative pain in children under one year excludes all of the following, EXCEPT:

What is the narcotic of choice for outpatient anesthesia?

A patient after undergoing thoracotomy complains of severe pain. The BEST method of pain control in this patient would be:

Child with aspiration risk needs emergency surgery. Best induction sequence is:

Which of the following anaesthetic agent lacks analgesic effect? A) N2O B) Thiopentone C) Methohexitone D) Ketamine E) Fentanyl

Which of the following is used as an adjuvant during anesthesia?

Anesthetic agent (s) safe to use in ICP

Which of the following drugs is contraindicated in a patient with raised intracranial pressure ?

Which of the following is the most suitable anesthetic agent for use in dogs?

Q10

Depth of anaesthesia can be best assessed by

Sedation and Analgesia in ICU Indian Medical PG Practice Questions and MCQs

Question 1: The Children's Hospital of Eastern Ontario Pain Scale (CHEOPS) for rating postoperative pain in children under one year excludes all of the following, EXCEPT:

A. Oxygen saturation
B. Torso
C. Verbal response (Correct Answer)
D. Cry

Explanation: ***Verbal response*** - The Children's Hospital of Eastern Ontario Pain Scale (CHEOPS) is designed for children **under one year of age**, who are typically pre-verbal. - While verbal complaints are not assessed, a child's **verbal response** (e.g., moaning, crying, or not making sounds at all) in relation to pain is a component of the scale, contributing to the interpretation of their comfort level. *Oxygen saturation* - **Physiological parameters** like oxygen saturation are typically not part of behavioral pain scales like CHEOPS, which focus on observable behaviors. - While low oxygen saturation can indicate distress, it is not a direct measure of pain for this scale. *Torso* - The CHEOPS scale assesses **pain-related behaviors** of extremities (e.g., legs, arms) and facial expressions, but does not specifically include observations of the "torso" as a separate category. - Behaviors like stiffening or arching of the torso might be implicitly considered under overall body tension, but it’s not a distinct domain. *Cry* - The **quality and intensity of crying** is a primary behavioral indicator of pain in pre-verbal infants and is a significant component of many pediatric pain scales, including CHEOPS. - A child's cry, along with other behaviors, helps differentiate between various levels of discomfort or pain.

Question 2: What is the narcotic of choice for outpatient anesthesia?

A. Morphine
B. Alfentanil (Correct Answer)
C. Fentanyl
D. Pethidine

Explanation: ***Alfentanil*** - **Alfentanil** has a **rapid onset** and **short duration of action** due to its low pKa (6.5) and high unionized fraction at physiologic pH, making it ideal for maintaining a stable anesthetic plane and rapid recovery in an outpatient setting. - Its **predictable pharmacokinetic profile** allows for precise titration and minimizes the risk of prolonged sedation post-procedure. *Morphine* - **Morphine** has a relatively **long duration of action** and active metabolites that can prolong sedation and respiratory depression, which is undesirable for outpatient procedures. - Its slower onset often requires higher initial doses, increasing the risk of **postoperative nausea and vomiting (PONV)**. *Fentanyl* - While **fentanyl** has a rapid onset and is potent, its **longer context-sensitive half-time** compared to alfentanil can lead to a slightly longer recovery profile, especially with prolonged infusions. - Its high lipophilicity can lead to drug accumulation in tissues, potentially prolonging its effects in outpatient settings. *Pethidine* - **Pethidine** (meperidine) has an **active metabolite, normeperidine**, which can accumulate and cause neurotoxicity (e.g., seizures), particularly with repeated doses or in patients with renal impairment. - It also has a **longer duration of action** and is associated with a higher incidence of tachycardia and other side effects compared to newer synthetic opioids.

Question 3: 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

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.

Question 4: Child with aspiration risk needs emergency surgery. Best induction sequence is:

A. Preoxygenation-ketamine-succinylcholine
B. Sevoflurane-propofol-succinylcholine
C. Midazolam-propofol-rocuronium
D. Preoxygenation-propofol-succinylcholine (Correct Answer)

Explanation: ***Preoxygenation-propofol-succinylcholine*** - This sequence describes a **rapid sequence intubation (RSI)**, which is the preferred method for patients at high risk of aspiration, including children needing emergency surgery with an unknown fasting status. - **Preoxygenation** provides an oxygen reserve during the apneic period, **propofol** offers rapid induction with good hemodynamic stability, and **succinylcholine** provides fast-onset, short-acting neuromuscular blockade, crucial for preventing aspiration. *Preoxygenation-ketamine-succinylcholine* - While preoxygenation and succinylcholine are appropriate for RSI, **ketamine** may not be the optimal choice for a child with aspiration risk due to its potential to increase secretions and maintain laryngeal reflexes, which could complicate intubation. - Ketamine can also cause **emergence delirium** in some children, making it less favorable for a smooth anesthetic course compared to propofol. *Sevoflurane-propofol-succinylcholine* - **Sevoflurane** is an inhaled anesthetic often used for mask induction in children due to its non-pungent odor and rapid onset. However, it is generally **not suitable for RSI** in patients with aspiration risk as it has a slower induction time compared to intravenous agents and can cause coughing or laryngospasm. - Using both sevoflurane and propofol for induction in an RSI scenario is redundant and prolongs the induction phase, increasing aspiration risk. *Midazolam-propofol-rocuronium* - **Midazolam** is a benzodiazepine used for anxiolysis and sedation but has a **slower onset** and longer duration of action compared to propofol for rapid induction. - **Rocuronium** is a non-depolarizing neuromuscular blocker with a slower onset of action than succinylcholine, making it less ideal for RSI where immediate paralysis for intubation is critical to prevent aspiration.

Question 5: 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)

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.

Question 6: Which of the following is used as an adjuvant during anesthesia?

A. Bupivacaine
B. Dexmedetomidine (Correct Answer)
C. Lorazepam
D. Neostigmine

Explanation: ***Dexmedetomidine*** - **Dexmedetomidine** is an alpha-2 adrenergic agonist commonly used as an **adjuvant** in anesthesia to provide **sedation**, **analgesia**, and **anxiolysis** with minimal respiratory depression. - Its unique properties allow for cooperative sedation, where patients can be aroused and follow commands, making it useful in various anesthetic settings. *Bupivacaine* - **Bupivacaine** is a **local anesthetic** used for regional anesthesia and pain management, not typically as an adjuvant to achieve general anesthetic effects. - It primarily blocks nerve impulse transmission to numb specific areas, rather than contributing to overall anesthetic depth or sedation. *Lorazepam* - **Lorazepam** is a **benzodiazepine** primarily used for **anxiolysis** and **sedation** prior to anesthesia or for treatment of anxiety. - While it can be given before surgery, it is not an anesthetic adjuvant in the same way dexmedetomidine is used during the operative phase to modulate anesthetic requirements and recovery. *Neostigmine* - **Neostigmine** is an **acetylcholinesterase inhibitor** used to **reverse the effects of non-depolarizing neuromuscular blockers** at the end of surgery. - It does not induce anesthesia, sedation, or analgesia, but rather restores muscle function to allow for extubation.

Question 7: Anesthetic agent (s) safe to use in ICP

A. Ketamine
B. Thiopentone (Correct Answer)
C. Halothane
D. Ether

Explanation: ***Thiopentone*** - **Thiopentone** is an ultrashort-acting barbiturate that reduces cerebral blood flow and cerebral metabolic rate, leading to a decrease in **intracranial pressure (ICP)**. - It rapidly depresses brain activity, which directly lowers the demand for oxygen and nutrients, thus decreasing the blood volume within the cranium. *Ketamine* - **Ketamine** is known to increase cerebral blood flow and cerebral metabolic rate, which can lead to an undesirable **increase in ICP**. - It causes cerebral vasodilation, which in patients with compromised intracranial compliance can worsen cerebral edema and raise ICP. *Halothane* - **Halothane** is a potent volatile anesthetic that causes significant **cerebral vasodilation**, leading to an increase in cerebral blood flow and potentially elevated **ICP**. - Its use has largely declined due to its dose-dependent cerebral vasodilation and potential for myocardial depression. *Ether* - **Ether** is an old inhaled anesthetic agent that causes marked **cerebral vasodilation** and increased cerebral blood flow, thereby elevating **ICP**. - It also has a slow onset and offset of action and is highly flammable, making it unsuitable for modern anesthesia, especially in neurosurgical contexts.

Question 8: Which of the following drugs is contraindicated in a patient with raised intracranial pressure ?

A. Ketamine (Correct Answer)
B. Midazolam
C. Propofol
D. Thiopentone

Explanation: ***Ketamine*** - **Ketamine** typically causes an increase in **cerebral blood flow** and **intracranial pressure (ICP)**, making it contraindicated in patients with raised ICP. - This effect is due to its action as a **dissociative anesthetic** which can lead to cerebral vasodilation. *Midazolam* - **Midazolam**, a benzodiazepine, can decrease **cerebral metabolic rate** and **cerebral blood flow**, thereby reducing ICP, making it a suitable option for sedation in patients with raised ICP. - It provides **sedation** and **anxiolysis** without significantly increasing ICP. *Propofol* - **Propofol** is a common choice for sedation in patients with raised ICP because it significantly reduces **cerebral blood flow**, **cerebral metabolic rate**, and thus **intracranial pressure**. - Its rapid onset and offset allow for precise control of depth of sedation and neurological assessment. *Thiopentone* - **Thiopentone**, a barbiturate, effectively reduces **cerebral blood flow** and **cerebral metabolic rate**, leading to a decrease in **intracranial pressure**. - It is often used for inducing anesthesia and as a neuroprotective agent in situations with acute brain injury.

Question 9: Which of the following is the most suitable anesthetic agent for use in dogs?

A. Propofol (Correct Answer)
B. Medetomidine hydrochloride
C. Ketamine
D. Midazolam

Explanation: ***Propofol*** - **Propofol** is a widely used and highly effective intravenous anesthetic in dogs due to its **rapid induction** and **rapid recovery**. - It produces minimal cumulative effects when administered as a constant rate infusion, making it suitable for both short procedures and maintenance of anesthesia. *Medetomidine hydrochloride* - **Medetomidine** is an **alpha-2 agonist** primarily used as a sedative and analgesic in dogs, not typically as the sole anesthetic agent for general anesthesia. - While it provides profound sedation, it is usually combined with other drugs (e.g., ketamine) to achieve surgical planes of anesthesia, and its effects on reducing heart rate and blood pressure can be significant. *Ketamine* - **Ketamine** is a **dissociative anesthetic** that provides good analgesia and somatic anesthesia but often causes muscle rigidity and can increase sympathetic tone. - It is typically used in combination with other sedatives or tranquilizers (e.g., diazepam, midazolam) to ensure smooth induction and recovery and prevent adverse effects like seizures. *Midazolam* - **Midazolam** is a **benzodiazepine** primarily used as a sedative, anxiolytic, and muscle relaxant, often as a premedicant or co-induction agent, not as a primary anesthetic for general anesthesia in dogs. - It offers minimal cardiovascular and respiratory depression when used alone, but it does not produce sufficient anesthetic depth for surgical procedures.

Question 10: Depth of anaesthesia can be best assessed by

A. ABG analysis
B. Pulse oximeter
C. End tidal Pco2
D. Bispectral index (Correct Answer)

Explanation: ***Bispectral index*** - The **Bispectral Index (BIS)** monitor processes **electroencephalogram (EEG)** signals to provide a numerical value (0-100) indicating the **level of consciousness** and hypnotic depth during anesthesia. - A lower BIS value (typically 40-60) indicates a deeper anesthetic state, helping clinicians avoid **awareness during surgery** and guide anesthetic agent delivery. *ABG analysis* - **Arterial Blood Gas (ABG)** analysis measures parameters like pH, PCO2, PO2, and bicarbonate, reflecting the patient's **acid-base balance** and **oxygenation**. - While important for overall physiological status, ABG analysis does not directly assess the **depth of anesthesia** or the patient's level of consciousness. *Pulse oximeter* - A **pulse oximeter** measures **oxygen saturation (SpO2)** and heart rate, reflecting the adequacy of oxygen delivery. - It does not provide information about the **depth of consciousness** or the hypnotic effect of anesthetic agents. *End tidal Pco2* - **End-tidal PCO2 (EtCO2)** monitors the partial pressure of carbon dioxide at the end of exhalation, providing an indication of **ventilation** and CO2 elimination. - While EtCO2 is crucial for managing ventilation during anesthesia, it does not directly reflect the **depth of anesthesia** or the patient's neurological state.

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