Postoperative Delirium Prevention — MCQs
Which first-line conventional drug is commonly used in the treatment of delirium?
The most common postoperative psychiatric condition is:
Emergence delirium is associated with –
Emergence Delirium is characteristic of?
Which of the following is the LEAST significant risk factor for postoperative pulmonary complications?
In postoperative intensive care unit, five patients developed postoperative wound infection on the same day. The best method to prevent cross infection occurring in other patients in the same ward is to:
A hospital is implementing a protocol to reduce perioperative pulmonary complications in high-risk patients undergoing major abdominal surgery. Based on current evidence, which combination of interventions would provide the greatest benefit?
A 62-year-old man with drug-eluting stent placed 4 months ago requires urgent colonoscopy with polypectomy for a bleeding polyp. He is on dual antiplatelet therapy (aspirin and clopidogrel). Analysis of risks shows continued bleeding risk versus stent thrombosis risk. What is the most evidence-based management strategy?
A 72-year-old man develops postoperative delirium on day 2 after hip replacement. His vitals are stable, and examination is unremarkable except for confusion. Laboratory workup including CBC, electrolytes, and arterial blood gas is normal. What is the most likely precipitating factor?
A 45-year-old woman with Child-Pugh Class B cirrhosis requires urgent abdominal surgery. Preoperative labs show: Albumin 2.8 g/dL, Bilirubin 3.2 mg/dL, INR 1.9, Creatinine 1.1 mg/dL. Her MELD score is calculated as 18. What is the approximate 90-day mortality risk?
Postoperative Delirium Prevention Indian Medical PG Practice Questions and MCQs
Question 1: Which first-line conventional drug is commonly used in the treatment of delirium?
- A. Haloperidol (Correct Answer)
- B. Lithium carbonate
- C. Opioids
- D. Selective Serotonin Reuptake Inhibitors (SSRIs)
Explanation: ***Haloperidol*** - **Haloperidol** is a first-generation antipsychotic widely considered the **first-line conventional drug** for managing **agitation and psychotic symptoms** in delirium (particularly in the context of this 2015 exam). - Its efficacy in controlling these symptoms promptly, coupled with its availability in oral, intramuscular, and intravenous forms, makes it a preferred choice, especially in acute settings. - **Note:** Current evidence (post-2018) emphasizes non-pharmacological interventions first, with antipsychotics reserved for severe agitation when non-pharmacological measures fail. *Lithium carbonate* - **Lithium carbonate** is primarily used as a **mood stabilizer** for bipolar disorder, not for acute management of delirium. - It has a narrow therapeutic window and requires **careful monitoring of blood levels** to prevent toxicity, making it unsuitable for acute delirium management. *Opioids* - **Opioids** are mainly used for **pain management** and can actually **exacerbate delirium** due to their sedative and central nervous system depressant effects. - They are not indicated for treating the core symptoms of delirium, such as disorientation, fluctuating consciousness, or psychotic features. *Selective Serotonin Reuptake Inhibitors (SSRIs)* - **SSRIs** are primarily used for the treatment of **depression and anxiety disorders**, and their therapeutic effects take several weeks to manifest. - They are not effective for the immediate management of acute delirium and may even **worsen confusion or agitation** in some delirious patients.
Question 2: The most common postoperative psychiatric condition is:
- A. Schizophrenia
- B. Delirium (Correct Answer)
- C. Chronic brain syndrome
- D. Depression
Explanation: ***Delirium*** - **Delirium** is the most common postoperative psychiatric condition, characterized by an acute onset of **waxing and waning attention**, **disorganized thinking**, and altered level of consciousness. - It is often seen in elderly patients and those with pre-existing cognitive impairment, due to the stress of surgery, anesthesia, and medication effects. *Schizophrenia* - **Schizophrenia** is a chronic psychotic disorder with onset typically in late adolescence or early adulthood, characterized by hallucinations, delusions, and disorganized thinking. - It is not typically triggered by surgery but rather a long-term psychiatric illness with a different etiology. *Chronic brain syndrome* - **Chronic brain syndrome** is an outdated term typically used to describe **dementia** or other persistent cognitive impairments. - While patients with chronic cognitive impairment are at higher risk for postoperative delirium, chronic brain syndrome itself is not an acute postoperative psychiatric condition. *Depression* - **Depression** is a common mood disorder characterized by persistent sadness, loss of interest, and other symptoms. - While depression can occur postoperatively, especially in patients with prolonged recovery or poor outcomes, it is typically not the most common acute psychiatric condition immediately following surgery.
Question 3: 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 4: 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 5: Which of the following is the LEAST significant risk factor for postoperative pulmonary complications?
- A. Age > 60 years (Correct Answer)
- B. ASA class 3 and 4 patients
- C. Longer surgeries >2 hr
- D. Upper Abdominal surgery
Explanation: ***Age > 60 years*** - While age is a factor, it is generally considered **less significant** than other comorbid conditions or surgical factors in predicting postoperative pulmonary complications. - Pulmonary function naturally declines with age, but healthy elderly individuals may still tolerate surgery well if other risk factors are controlled. *ASA class 3 and 4 patients* - Patients classified as **ASA (American Society of Anesthesiologists) 3 or 4** have severe systemic disease or life-threatening systemic disease, respectively. - This significantly increases their risk of **postoperative pulmonary complications** due to their underlying health issues. *Longer surgeries >2 hr* - **Prolonged duration of surgery** (typically defined as >2-3 hours) is a significant independent risk factor for pulmonary complications. - This is due to longer periods of **immobility**, ventilation, and exposure to anesthetics, contributing to atelectasis and pneumonia risk. *Upper Abdominal surgery* - **Upper abdominal surgery** is one of the highest risk categories for postoperative pulmonary complications. - Incisions in this area can cause *diaphragmatic dysfunction*, pain leading to shallow breathing, and impaired cough reflex.
Question 6: In postoperative intensive care unit, five patients developed postoperative wound infection on the same day. The best method to prevent cross infection occurring in other patients in the same ward is to:
- A. Practice proper hand washing (Correct Answer)
- B. Disinfect the ward with sodium hypochlorite
- C. Fumigate the ward
- D. Give antibiotics to all other patients in the ward
Explanation: ***Correct: Practice proper hand washing*** - **Proper hand hygiene** is the **single most effective method** for preventing the transmission of **healthcare-associated infections (HAIs)**, including surgical site infections - It physically removes or inactivates **transient microorganisms** from the hands of healthcare workers, thereby stopping their spread between patients - This is the **gold standard** recommended by **WHO, CDC**, and all major infection control guidelines for preventing **cross-infection** in healthcare settings *Incorrect: Disinfect the ward with sodium hypochlorite* - While disinfection with **sodium hypochlorite** is important for **environmental cleaning**, it is **less effective than hand hygiene** in preventing direct patient-to-patient transmission - Environmental disinfection alone **cannot interrupt the main routes of transmission**, which often involve **direct contact** or contaminated hands of healthcare personnel - This is a **secondary measure**, not the primary prevention strategy *Incorrect: Fumigate the ward* - **Fumigation** is typically used for **terminal disinfection** in specific situations, such as after highly contagious outbreaks, and is **not a routine** or primary method for preventing cross-infection in an active ward - Its effectiveness in preventing day-to-day cross-infection is **limited compared to immediate infection control practices** like hand hygiene - This practice is largely **outdated** in modern infection control protocols *Incorrect: Give antibiotics to all other patients in the ward* - **Prophylactic antibiotic use** in all other patients is **discouraged** due to the risk of **antimicrobial resistance (AMR)** and potential adverse effects - It does **not address the source of infection** or the transmission pathways, and can lead to wider public health issues - This is an **inappropriate primary prevention strategy** that violates antimicrobial stewardship principles
Question 7: A hospital is implementing a protocol to reduce perioperative pulmonary complications in high-risk patients undergoing major abdominal surgery. Based on current evidence, which combination of interventions would provide the greatest benefit?
- A. Preoperative spirometry, postoperative incentive spirometry, early mobilization
- B. Smoking cessation >8 weeks prior, lung expansion maneuvers, epidural analgesia (Correct Answer)
- C. Prophylactic bronchodilators, routine chest physiotherapy, supplemental oxygen
- D. Preoperative antibiotics, deep breathing exercises, prolonged mechanical ventilation
Explanation: ***Smoking cessation >8 weeks prior, lung expansion maneuvers, epidural analgesia*** - **Smoking cessation** must occur at least **8 weeks** before surgery to effectively reduce the risk of pulmonary complications to baseline levels; shorter periods may actually increase secretion production [1]. - **Epidural analgesia** provides superior pain control for abdominal surgery, which facilitates better **respiratory effort** and prevents the diaphragm dysfunction that leads to atelectasis. *Preoperative spirometry, postoperative incentive spirometry, early mobilization* - While early mobilization is beneficial, **preoperative spirometry** is a diagnostic tool used for **risk stratification** rather than an intervention that actively reduces postoperative complications. - **Incentive spirometry** alone is generally not superior to deep breathing exercises and must be part of a broader lung expansion protocol to be effective. *Prophylactic bronchodilators, routine chest physiotherapy, supplemental oxygen* - **Prophylactic bronchodilators** are not recommended for all patients and should only be used in patients with specific underlying conditions like **COPD** or **Asthma** [1]. - **Routine chest physiotherapy** has not consistently demonstrated a significant reduction in **postoperative pulmonary complications (PPCs)** for general high-risk abdominal surgery patients. *Preoperative antibiotics, deep breathing exercises, prolonged mechanical ventilation* - **Prolonged mechanical ventilation** is actually a risk factor for **ventilator-associated pneumonia** and other lung injuries, rather than a preventive strategy [2]. - While **deep breathing exercises** are helpful, they are outweighed here by the risks associated with unnecessary mechanical ventilation and the lack of systemic evidence for routine **preoperative antibiotics** specifically for PPC prevention [3].
Question 8: A 62-year-old man with drug-eluting stent placed 4 months ago requires urgent colonoscopy with polypectomy for a bleeding polyp. He is on dual antiplatelet therapy (aspirin and clopidogrel). Analysis of risks shows continued bleeding risk versus stent thrombosis risk. What is the most evidence-based management strategy?
- A. Discontinue clopidogrel only, add prophylactic heparin bridging
- B. Discontinue both aspirin and clopidogrel 7 days before procedure
- C. Continue aspirin, discontinue clopidogrel 5 days before procedure (Correct Answer)
- D. Continue both aspirin and clopidogrel throughout procedure
Explanation: ***Continue aspirin, discontinue clopidogrel 5 days before procedure*** - In patients with a **coronary stent** implanted recently, maintaining **aspirin monotherapy** provides essential protection against **stent thrombosis** while reducing the procedural bleeding risk compared to dual therapy [1]. - For high-bleeding-risk procedures like **polypectomy**, guidelines recommend pausing **P2Y12 inhibitors** (clopidogrel) for **5 days** to allow platelet function to recover sufficiently. *Discontinue clopidogrel only, add prophylactic heparin bridging* - **Heparin bridging** is indicated for patients at high risk of **thromboembolism** (e.g., mechanical valves or AFib) but has no proven benefit in preventing **stent thrombosis**. - Utilizing heparin in place of antiplatelets increases **bleeding complications** without addressing the pathophysiology of platelet-induced stent occlusion. *Discontinue both aspirin and clopidogrel 7 days before procedure* - Complete cessation of **dual antiplatelet therapy (DAPT)** within the first 6-12 months of a **drug-eluting stent (DES)** severely increases the risk of **major adverse cardiovascular events (MACE)**. - Aspirin should almost always be continued perioperatively unless the procedure involves a closed-space surgery with a high risk of catastrophic bleeding, such as **neurosurgery**. *Continue both aspirin and clopidogrel throughout procedure* - While this strategy eliminates the risk of **stent thrombosis**, it significantly increases the risk of **post-polypectomy bleeding**, which can be difficult to manage during the procedure. - Current evidence-based surgical guidelines categorize **colonoscopic polypectomy** as a **high-bleeding-risk** procedure that mandates the temporary interruption of clopidogrel.
Question 9: A 72-year-old man develops postoperative delirium on day 2 after hip replacement. His vitals are stable, and examination is unremarkable except for confusion. Laboratory workup including CBC, electrolytes, and arterial blood gas is normal. What is the most likely precipitating factor?
- A. Undiagnosed dementia with acute decompensation
- B. Hypoxia from subclinical pulmonary embolism
- C. Multifactorial including surgery, medications, and environmental factors (Correct Answer)
- D. Occult infection not yet manifested
Explanation: Multifactorial including surgery, medications, and environmental factors - Postoperative **delirium** in elderly patients is most commonly triggered by a combination of **surgical stress**, **anesthesia**, and use of **opioid** or **anticholinergic** medications [1]. - The **unfamiliar environment** of the hospital, **sleep deprivation**, and **immobilization** post-surgery further exacerbate cognitive dysfunction in vulnerable individuals [1]. *Undiagnosed dementia with acute decompensation* - While **dementia** is a significant **predisposing factor** for delirium, it describes the baseline vulnerability rather than the acute trigger [1]. - In this clinical scenario, the delirium occurs on postoperative day 2, pointing toward the **perioperative stressors** as the primary precipitant [1]. *Hypoxia from subclinical pulmonary embolism* - A normal **arterial blood gas (ABG)** and stable vital signs effectively rule out **hypoxia** or significant **pulmonary embolism** as the cause [1]. - While PE is a concern after hip replacement, medical workup shows no **respiratory distress** or oxygenation issues to explain the confusion. *Occult infection not yet manifested* - The laboratory workup, including a normal **CBC**, makes an acute infectious process like **sepsis** or a **urinary tract infection** unlikely [1]. - While infection is a known cause of delirium, the absence of **fever**, **leukocytosis**, or vital sign instability directs the diagnosis toward non-infectious perioperative factors [1].
Question 10: A 45-year-old woman with Child-Pugh Class B cirrhosis requires urgent abdominal surgery. Preoperative labs show: Albumin 2.8 g/dL, Bilirubin 3.2 mg/dL, INR 1.9, Creatinine 1.1 mg/dL. Her MELD score is calculated as 18. What is the approximate 90-day mortality risk?
- A. 5-10%
- B. 40-50%
- C. 15-20%
- D. 25-30% (Correct Answer)
Explanation: ***25-30%*** - The **MELD score** (Model for End-Stage Liver Disease) is a validated predictor of **90-day mortality** in patients with cirrhosis undergoing major abdominal surgery [1]. - A **MELD score of 15-20** (this patient is 18) typically correlates with a post-operative mortality risk in the **25-30% range**. *5-10%* - This range is associated with **Child-Pugh Class A** or **MELD scores <10**, representing much lower perioperative risk. - Patients with such low scores have preserved **synthetic liver function** and minimal portal hypertension. *40-50%* - This elevated mortality risk is generally seen in patients with **MELD scores >20** or those with **Child-Pugh Class C** cirrhosis. - Surgical intervention in this group is often avoided unless it is life-saving due to the high risk of **liver failure** and **death** post-operatively. *15-20%* - This range often corresponds to patients with a **MELD score of 10-15** or compensated **Child-Pugh Class B** cirrhosis. - While the risk is significant, it is lower than the mortality predicted for a patient with a score of 18 and signs of **coagulopathy** (INR 1.9) [1].
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