Sedation and Analgesia — MCQs
Anaesthetic agent causing analgesia?
Child with aspiration risk needs emergency surgery. Best induction sequence is:
The best scale to measure pain in children of 5 years of age would be:
How do benzodiazepines exert their sedative effects?
During rapid sequence intubation in a child after taking brief history and clinical examination next step is:
Which of the following anaesthetic agent lacks analgesic effect? A) N2O B) Thiopentone C) Methohexitone D) Ketamine E) Fentanyl
Which of the following anesthetic agents have good analgesic property? a) Ketamine b) Nitrous oxide c) Thiopentone d) Propofol e) Midazolam
A child with moderate to severe head injury is admitted in PICU. First line treatments are all except:
A pediatric patient presents with a 45-minute history of continuous convulsions. The senior resident (SR) recommends IV lorazepam, but the junior resident (JR) is unable to secure IV access. What is the next best step in management?
A six year old child is admitted to the Paediatric ICU for seizures. He has been on treatment with Tacrolimus and Prednisolone. On investigations his blood urea is 68 mg/dL, Serum Sodium is 136 mEq/L likely cause of his seizures-
Sedation and Analgesia 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: 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 3: The best scale to measure pain in children of 5 years of age would be:
- A. VAS
- B. CHEOPS
- C. Faces Scale (Correct Answer)
- D. McGill Scale
Explanation: ***Correct: Faces Scale*** - The **Faces Pain Scale-Revised (FPS-R)** is the **gold standard for pain assessment in children aged 4-12 years** who are capable of self-reporting pain. - At **5 years of age**, children have the cognitive ability to understand and use facial expressions to indicate their pain level, making this the **preferred tool** for this age group. - It uses simple cartoon faces ranging from "no pain" to "worst pain," which are easily understood by preschool and school-aged children. - **Self-report scales are preferred over behavioral scales** when children are developmentally capable of using them, as per WHO and pediatric pain management guidelines. *Incorrect: CHEOPS* - The **Children's Hospital of Eastern Ontario Pain Scale (CHEOPS)** is a **behavioral observation scale** designed for children aged 1-7 years. - While valid for 5-year-olds, it is primarily used for **post-operative pain assessment** or when children **cannot self-report** (e.g., sedated, developmentally delayed, or very young). - At age 5, when a child can self-report, behavioral scales are **less preferred** than self-report tools like the Faces Scale. - CHEOPS requires trained observers and assesses 6 behavioral categories: cry, facial expression, verbal responses, torso position, touch, and leg position. *Incorrect: VAS* - The **Visual Analog Scale (VAS)** is a continuous scale requiring abstract thinking about pain intensity, typically suitable for children **≥8 years** and adults. - A 5-year-old typically **lacks the cognitive maturity** to accurately conceptualize pain on an abstract linear scale without concrete visual anchors. *Incorrect: McGill Scale* - The **McGill Pain Questionnaire** is a complex, multidimensional tool designed for **adults and adolescents**. - It relies on sophisticated vocabulary to describe sensory, affective, and evaluative aspects of pain, making it **completely unsuitable** for a 5-year-old child.
Question 4: How do benzodiazepines exert their sedative effects?
- A. They enhance GABAergic transmission. (Correct Answer)
- B. They increase norepinephrine levels and enhance GABA transmission.
- C. They block dopamine receptors and enhance GABA transmission.
- D. They inhibit acetylcholine release and enhance GABA transmission.
Explanation: ***They enhance GABAergic transmission.*** - Benzodiazepines bind to a specific site on the **GABA-A receptor**, increasing its affinity for the **neurotransmitter GABA**. - This binding leads to an increased frequency of **chloride channel opening**, hyperpolarizing the neuron and making it less excitable, which produces sedative effects. *They increase norepinephrine levels and enhance GABA transmission.* - While benzodiazepines enhance GABA transmission, they do **not primarily increase norepinephrine levels**. - Medications that increase norepinephrine levels, such as certain antidepressants, typically have stimulating rather than sedative effects. *They block dopamine receptors and enhance GABA transmission.* - While benzodiazepines enhance GABA transmission, they do **not block dopamine receptors**. - Blocking dopamine receptors is the primary mechanism of action for many **antipsychotic medications**, which have different pharmacological profiles and side effects compared to benzodiazepines. *They inhibit acetylcholine release and enhance GABA transmission.* - While benzodiazepines enhance GABA transmission, they generally do **not directly inhibit acetylcholine release**. - Muscarinic acetylcholine receptor antagonists (anticholinergics) inhibit acetylcholine and can cause sedation, but this is a distinct mechanism from benzodiazepines.
Question 5: During rapid sequence intubation in a child after taking brief history and clinical examination next step is:
- A. Administer oxygen (Correct Answer)
- B. Analgesic injection with Fentanyl
- C. Preanaesthetic medication with atropine and lignocaine
- D. IV anesthetic Diazepam/Ketamine
Explanation: ***Administer oxygen*** - Pre-oxygenation with 100% oxygen is critical before **rapid sequence intubation (RSI)** to maximize **oxygen reserves** and extend the safe apnea time. - This step helps prevent **hypoxemia** during the intubation procedure, especially in children who have lower functional residual capacity. *Analgesic injection with Fentanyl* - While fentanyl is often used in RSI for its **analgesic** and **sedative properties**, it typically follows pre-oxygenation and is administered as part of the **induction phase**, often concurrently with a paralytic. - Administering fentanyl alone without prior oxygenation or other induction agents would not be the immediate next step in a structured RSI protocol. *Preanaesthetic medication with atropine and lignocaine* - **Atropine** may be used in children to prevent **bradycardia** during intubation, particularly in infants, but it's not the immediate next step after initial assessment; pre-oxygenation is more critical. - **Lidocaine** can be used to blunt the sympathetic response to intubation or to suppress cough, but it's not universally required and comes after pre-oxygenation and other induction medications. *IV anesthetic Diazepam/Ketamine* - **Diazepam** and **ketamine** are **induction agents** that cause sedation and loss of consciousness, but they are administered after pre-oxygenation and often just before the paralytic agent. - Administering an induction agent without adequate pre-oxygenation would increase the risk of **hypoxemia** during the subsequent apnea.
Question 6: 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 7: 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 8: A child with moderate to severe head injury is admitted in PICU. First line treatments are all except:
- A. Analgesia and sedation
- B. Hypothermia
- C. Controlled mechanical ventilation
- D. IV mannitol (Correct Answer)
Explanation: ***IV mannitol*** - While **intravenous mannitol** is used in the management of head injury to reduce **intracranial pressure (ICP)**, it is **not a first-line treatment**. - It is a **second-line therapy** reserved for documented or suspected elevated ICP despite initial supportive measures. - First-line management focuses on maintaining adequate oxygenation, ventilation, and cerebral perfusion, while mannitol is used for specific ICP management when needed. *Analgesia and sedation* - **Analgesia and sedation** are essential **first-line treatments** to reduce pain, anxiety, and agitation, which can increase **intracranial pressure (ICP)**. - These therapies ensure patient comfort, decrease metabolic demand, facilitate mechanical ventilation, and prevent secondary brain injury. *Hypothermia* - **Therapeutic hypothermia** is **NOT routinely recommended** as a first-line treatment in pediatric traumatic brain injury. - Current evidence (including the Cool Kids trial) has not demonstrated benefit, and it may be associated with adverse effects. - It is considered **investigational** and not part of standard first-line management protocols. - **Note**: While this is also not first-line, the question specifically tests knowledge that mannitol is second-line therapy for ICP management. *Controlled mechanical ventilation* - **Controlled mechanical ventilation** is a fundamental **first-line treatment** for severe head injury to secure the airway and ensure adequate oxygenation and ventilation. - Prevents secondary brain injury from **hypoxia** and **hypercapnia**, which can worsen outcomes. - Maintaining appropriate **PaCO2 levels** is critical to control cerebral blood flow and intracranial pressure.
Question 9: A pediatric patient presents with a 45-minute history of continuous convulsions. The senior resident (SR) recommends IV lorazepam, but the junior resident (JR) is unable to secure IV access. What is the next best step in management?
- A. Rectal diazepam (Correct Answer)
- B. Intramuscular phenobarbital
- C. Intramuscular midazolam
- D. IV phenytoin
Explanation: ***Rectal diazepam*** - Rectal diazepam is an **effective first-line alternative** when IV access cannot be obtained in status epilepticus - It has a **rapid onset of action** (within 2-5 minutes) and can be easily administered in emergency settings - **Widely available** and part of established pediatric seizure protocols globally - Both rectal diazepam and IM midazolam are acceptable alternatives per current guidelines *Intramuscular midazolam* - IM midazolam is **equally effective** and increasingly preferred in many modern protocols when IV access is unavailable - The RAMPART trial demonstrated **faster seizure cessation** with IM midazolam compared to rectal diazepam in prehospital settings - **Both IM midazolam and rectal diazepam** are considered first-line alternatives per WHO and major pediatric emergency guidelines - Either option is appropriate depending on local protocols and availability *Intramuscular phenobarbital* - Phenobarbital has a **slower onset of action** when given intramuscularly (15-30 minutes) - Typically reserved for **refractory status epilepticus** or as a second-line agent after benzodiazepines have failed - Not preferred as an immediate alternative to IV lorazepam *IV phenytoin* - IV phenytoin **requires IV access**, which is specifically unavailable in this scenario - It is a second-line antiepileptic for status epilepticus, used after benzodiazepines - Requires **cardiac monitoring** due to risk of hypotension and arrhythmias
Question 10: A six year old child is admitted to the Paediatric ICU for seizures. He has been on treatment with Tacrolimus and Prednisolone. On investigations his blood urea is 68 mg/dL, Serum Sodium is 136 mEq/L likely cause of his seizures-
- A. Hyponatremia
- B. Uremia
- C. Hypocalcemia
- D. Tacrolimus Toxicity (Correct Answer)
Explanation: ***Tacrolimus Toxicity*** - **Tacrolimus** is an immunosuppressant known to cause neurotoxicity, including seizures, particularly at higher concentrations or in susceptible individuals. - The patient's history of **tacrolimus use** and the absence of clear electrolyte imbalances make toxicity a primary concern. *Hyponatremia* - **Hyponatremia** (low serum sodium) is a common cause of seizures. - However, the patient's serum sodium level of **136 meq/L** is within the normal range, ruling out hyponatremia as the cause. *Uremia* - **Uremia**, characterized by a high blood urea nitrogen (BUN) and creatinine, can cause seizures due to the accumulation of toxins. - While the patient's **blood urea of 68 mg/dL** is elevated, it is not severely high enough in isolation to confidently ascribe seizures to uremia without additional clinical context like significantly impaired renal function. *Hypocalcemia* - **Hypocalcemia** (low serum calcium) can lead to seizures and other neurological symptoms. - However, there is no information provided about the patient's calcium levels, and it is less likely given the patient's current medication profile compared to tacrolimus's known side effects.
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