Sedation and Analgesia in ICU — MCQs

10 questions

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

What is the drug of choice for treating delirium tremens?

Visual analogue scale is most widely used to measure

Emergence delirium is associated with –

Emergence Delirium is characteristic of?

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

Which Benzodiazepine decreases post-operative nausea & vomiting:-

Anaesthetic agent causing analgesia?

A child with moderate to severe head injury is admitted in PICU. First line treatments are all except:

Q10

Best guide for the management of Resuscitation is:

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

Question 1: 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 2: What is the drug of choice for treating delirium tremens?

A. Phenytoin
B. Morphine
C. Lorazepam (Correct Answer)
D. Diazepam

Explanation: ***Lorazepam*** - **Benzodiazepines** are the first-line treatment for **delirium tremens** due to their effectiveness in reducing central nervous system hyperexcitability through GABA-A receptor agonism. - **Lorazepam** is often preferred, especially in patients with liver impairment (common in chronic alcoholics), because it is metabolized by **glucuronidation** rather than hepatic oxidation, making it safer in hepatic dysfunction. - It has an **intermediate half-life (10-20 hours)** with **no active metabolites**, providing predictable pharmacokinetics and easier dose titration. - Can be administered via multiple routes (IV, IM, oral), making it versatile in acute settings. *Diazepam* - Also a **first-line benzodiazepine** for alcohol withdrawal and delirium tremens, particularly effective in patients with normal liver function. - Has a **long half-life (20-100 hours)** with **active metabolites** (desmethyldiazepam), which can accumulate in patients with hepatic impairment, leading to prolonged sedation. - Metabolized by hepatic **oxidation** (CYP450), making it less ideal in liver disease. - The longer duration of action can be advantageous for tapering protocols but may cause excessive sedation in vulnerable patients. *Phenytoin* - **Phenytoin** is an **anticonvulsant** that is **not effective** for treating delirium tremens or alcohol withdrawal seizures as monotherapy. - It does not address the primary pathophysiology of alcohol withdrawal, which involves GABAergic and glutamatergic system imbalance. - May be used as **adjunctive therapy** in patients with concurrent seizure disorders, but benzodiazepines remain the mainstay. *Morphine* - **Morphine** is an **opioid analgesic** with **no role** in the treatment of delirium tremens. - Use of opioids could **worsen respiratory depression**, particularly dangerous in agitated patients with potential for aspiration. - Does not address the neurochemical basis of alcohol withdrawal and may complicate management.

Question 3: Visual analogue scale is most widely used to measure

A. Sleep
B. Sedation
C. Depth of anaesthesia
D. Pain intensity (Correct Answer)

Explanation: ***Pain intensity*** - The **Visual Analogue Scale (VAS)** is a psychometric response scale primarily used to measure the subjective intensity of **pain**. - It allows patients to indicate their pain level on a continuous scale, typically a 10 cm line, providing a more nuanced measure than categorical scales. *Sleep* - While sleep quality and subjective experience can be assessed, the **VAS** is not the primary or most widely used tool for measuring sleep itself. - **Polysomnography** and various sleep questionnaires are more commonly employed for sleep assessment. *Sedation* - Though subjective sedation levels can be rated, more specific scales like the **Ramsay Sedation Scale** or **Richmond Agitation-Sedation Scale (RASS)** are more commonly used for objective and consistent evaluation of sedation. *Depth of anaesthesia* - **Depth of anaesthesia** is primarily measured using objective physiological parameters and processed **electroencephalogram (EEG)** analysis (e.g., Bispectral Index or BIS), not subjective scales like the VAS. - These objective measures provide real-time data to guide anesthetic administration.

Question 4: Emergence delirium is associated with –

A. Halothane
B. Pentothal sodium
C. Droperidol
D. Ketamine (Correct Answer)

Explanation: ***Ketamine*** - **Ketamine**, an N-methyl-D-aspartate (NMDA) receptor antagonist, is known to cause **emergent delirium** or **psychotic reactions** during recovery from anesthesia due to its dissociative properties. - This adverse effect is more common in adults and can manifest as **hallucinations**, **vivid dreams**, and **confusion**, particularly when used as a sole anesthetic agent. *Halothane* - **Halothane** is an inhalational anesthetic that was associated with relatively slow emergence, but not typically with **delirium** as a prominent feature. - Its primary concern was **hepatotoxicity** (halothane hepatitis) and **malignant hyperthermia**, rather than emergence delirium. *Pentothal sodium* - **Pentothal sodium** (thiopental) is a short-acting barbiturate used for induction of anesthesia, known for rapid onset and offset. - While it can cause some **post-operative drowsiness**, it is not primarily associated with **emergent delirium**; instead, it provides a smooth and calm recovery. *Droperidol* - **Droperidol** is an antipsychotic and antiemetic agent often used to prevent post-operative nausea and vomiting, and can cause **sedation**. - It is known to **reduce** the incidence of emergence delirium caused by other agents, rather than causing it itself.

Question 5: Emergence Delirium is characteristic of?

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

Explanation: ***Ketamine*** - **Emergence delirium**, characterized by vivid dreams, hallucinations, and confusion upon recovery from anesthesia, is a known side effect of **ketamine**, particularly in adults. - This effect is attributed to ketamine's action on **NMDA receptors** and can be attenuated by co-administration of benzodiazepines. *Midazolam* - **Midazolam** is a benzodiazepine often used for sedation and anxiolysis, and it typically causes amnesia and relaxation rather than a delirious state upon emergence. - While it can cause paradoxical agitation in some patients, it does not characteristically lead to emergence delirium similar to ketamine. *Thiopentone* - **Thiopentone** is a short-acting barbiturate used for induction of anesthesia, known for rapid onset and offset, leading to smooth emergence without significant delirium. - Its primary effect is general central nervous system depression, not dissociative anesthesia associated with emergence phenomena. *Opioids* - **Opioids** are potent analgesics that, at higher doses, can cause respiratory depression, nausea, and somnolence; however, they do not characteristically cause emergence delirium. - While they can contribute to postoperative cognitive dysfunction, it is distinct from the dissociative emergence state seen with ketamine.

Question 6: 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 7: Which Benzodiazepine decreases post-operative nausea & vomiting:-

A. Midazolam (Correct Answer)
B. Diazepam
C. Lorazepam
D. All of the options

Explanation: ***Midazolam*** - **Midazolam** is a commonly used benzodiazepine in anesthesia that has been shown to have **antiemetic properties** and can decrease the incidence of **postoperative nausea and vomiting (PONV)**. - Its mechanism may involve its sedative and anxiolytic effects, indirectly reducing the triggers for nausea. *Diazepam* - While **diazepam** is a benzodiazepine with sedative and anxiolytic effects, it is not primarily known for reducing PONV. - Its longer duration of action compared to midazolam can also contribute to unwanted **postoperative sedation**. *Lorazepam* - **Lorazepam** is another benzodiazepine used for anxiolysis and sedation but is not a primary agent for the prevention of PONV. - Like diazepam, its prolonged effects can lead to **delayed recovery** and drowsiness, which may not be desirable in the postoperative period. *All of the options* - While all listed drugs are benzodiazepines, only **midazolam** is consistently recognized and utilized for its ability to reduce PONV in the perioperative setting. - The other benzodiazepines do not demonstrate the same consistent benefit in PONV reduction and may have other side effects that limit their utility for this specific purpose.

Question 8: 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 9: 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 10: Best guide for the management of Resuscitation is:

A. Blood pressure
B. Urine output (Correct Answer)
C. Saturation of Oxygen
D. CVP

Explanation: ***Urine output*** - **Urine output** is an excellent indicator of **renal perfusion** and overall tissue perfusion, reflecting the adequacy of fluid resuscitation [1]. - Maintaining a urine output of **0.5-1 mL/kg/hr** is generally a target for effective resuscitation in critically ill patients. *Blood pressure* - While blood pressure is a vital sign, it can be maintained within normal limits through **compensatory mechanisms** (e.g., vasoconstriction) even when significant hypovolemia or shock is present [1]. - Relying solely on blood pressure may lead to inadequate resuscitation as it can **normalize transiently** without true restoration of tissue perfusion. *Saturation of Oxygen* - **Oxygen saturation** primarily reflects the oxygenation status of the blood (**peripheral oxygen delivery**), not necessarily the adequacy of tissue perfusion or volume status [1]. - Normal oxygen saturation can occur in hypotensive or hypoperfused states if the lungs are functioning adequately. *CVP* - **Central venous pressure (CVP)** is a measure of the filling pressure of the right atrium and an indicator of **right ventricular preload** [1]. - While CVP can offer some insight into fluid status, it is often a **poor predictor of fluid responsiveness** and can be affected by many factors unrelated to intravascular volume, such as intrathoracic pressure and right ventricular function [1].

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free