Postoperative Care — MCQs

Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 51: A 45-year-old male with chronic obstructive pulmonary disease (COPD) is undergoing elective surgery. What is the best strategy for postoperative pain management?

A. Transdermal fentanyl
B. Epidural analgesia (Correct Answer)
C. Oral NSAIDs
D. Intravenous morphine

Explanation: ***Epidural analgesia*** - Provides **excellent pain control** while minimizing systemic opioid side effects, which is crucial in patients with **COPD** who may be sensitive to respiratory depression. - Improves **pulmonary function** post-operatively by reducing pain-induced splinting and improving inspiration and coughing ability. *Intravenous morphine* - Can cause **significant respiratory depression**, which is particularly dangerous in patients with compromised respiratory function like those with COPD. - While effective for pain, its systemic effects make it a less ideal choice compared to regional techniques in this population. *Oral NSAIDs* - Provide good analgesia for mild to moderate pain but are generally **insufficient for severe postoperative pain**. - Can be associated with **gastrointestinal side effects** and **renal dysfunction**, and do not address the specific respiratory concerns in COPD. *Transdermal fentanyl* - Primarily used for **chronic pain management** and has a **slow onset of action**, making it unsuitable for acute postoperative pain. - Can also cause **respiratory depression**, similar to intravenous opioids, and its delayed effect makes titration difficult in the immediate postoperative period.

Question 52: Which crystalloid solution is most commonly used in perioperative fluid management?

A. Normal saline
B. Dextrose 5%
C. Albumin
D. Ringer's lactate (Correct Answer)

Explanation: ***Ringer's lactate*** - **Ringer's lactate** is a **balanced salt solution** containing electrolytes (sodium, chloride, potassium, calcium) and lactate, which is metabolized to bicarbonate. - Its composition is relatively similar to plasma, making it a preferred choice for **volume expansion** and replacement of fluid losses in the perioperative setting due to a lower risk of metabolic acidosis compared to normal saline. *Normal saline* - **Normal saline (0.9% NaCl)** contains a higher chloride concentration than plasma, which can lead to **hyperchloremic metabolic acidosis** with large-volume administration. - While commonly used, its unbalanced electrolyte profile makes it less physiologically ideal than Ringer's lactate for routine perioperative fluid management. *Dextrose 5%* - **Dextrose 5% in water (D5W)** is primarily used as a source of **free water** and to provide minimal caloric support, or for maintaining patency of intravenous lines. - It is not an effective volume expander as dextrose is rapidly metabolized, leaving behind hypotonic fluid that distributes throughout all fluid compartments. *Albumin* - **Albumin** is a **colloid solution**, meaning it contains large molecules that remain in the intravascular space and exert oncotic pressure. - It is typically reserved for specific situations like **hypoalbuminemia**, large volume resuscitation in critically ill patients, or conditions where crystalloids are insufficient, rather than routine perioperative fluid management.

Question 53: Which drug is most likely to cause postoperative nausea and vomiting?

A. Ondansetron
B. Midazolam
C. Propofol
D. Isoflurane (Correct Answer)

Explanation: ***Isoflurane*** - **Volatile anesthetics** like isoflurane are known to increase the incidence of **postoperative nausea and vomiting (PONV)** due to their effects on the chemoreceptor trigger zone and vestibular system. - While all volatile anesthetics can contribute to PONV, isoflurane is particularly associated with a higher risk compared to TIVA (total intravenous anesthesia). *Propofol* - **Propofol** is an intravenous anesthetic that has **antiemetic properties**, meaning it can actually help reduce the incidence of PONV. - It is often used for inducing and maintaining anesthesia, and its use is associated with a lower risk of PONV compared to volatile agents. *Ondansetron* - **Ondansetron** is a **5-HT3 receptor antagonist** and is a first-line drug used **to prevent and treat PONV**, not cause it. - It blocks serotonin receptors in the gastrointestinal tract and chemoreceptor trigger zone, effectively reducing nausea and vomiting. *Midazolam* - **Midazolam** is a **benzodiazepine** used for sedation, anxiolysis, and amnesia, and does not typically cause PONV. - It can sometimes be used in conjunction with other antiemetics to reduce anxiety which might contribute to nausea in some patients.

Question 54: A 40-year-old female with a history of obesity and obstructive sleep apnea (OSA) is scheduled for a laparoscopic cholecystectomy. What is the most important postoperative consideration for this patient?

A. Early ambulation
B. Use of incentive spirometry
C. Monitoring for respiratory depression (Correct Answer)
D. Aggressive fluid management

Explanation: ***Monitoring for respiratory depression*** - Patients with a history of **obesity** and **obstructive sleep apnea (OSA)** are at significantly increased risk for **postoperative respiratory depression** due to synergistic effects of residual anesthesia, opioids, and their underlying respiratory compromise. - **Hypoxia** and **hypercapnia** can lead to serious complications including cardiac arrest, making vigilant monitoring crucial. *Early ambulation* - While important for preventing **venous thromboembolism** and **improving recovery**, it does not directly address the immediate and life-threatening risk of respiratory depression in this high-risk patient. - Ambulation is a general postoperative goal for most patients but is not the *most important* consideration for this specific patient with OSA. *Use of incentive spirometry* - **Incentive spirometry** is useful for preventing **atelectasis** and **pneumonia**, particularly in patients undergoing abdominal surgery, but does not directly mitigate acute respiratory depression. - It is a pulmonary hygiene technique that encourages deep breathing, which is secondary to ensuring adequate respiratory drive and ventilation. *Aggressive fluid management* - **Aggressive fluid management** can lead to complications such as **fluid overload** and **pulmonary edema**, which could further compromise respiratory status, especially in obese patients. - Fluid management should be appropriate and individualized, but it is not the most critical immediate consideration for a patient with OSA.

Question 55: What is the most comprehensive approach to preventing perioperative hypothermia?

A. Using warm intravenous fluids
B. Maintaining room temperature
C. Prewarming the patient
D. Prewarming the patient, using warm intravenous fluids, and maintaining room temperature (Correct Answer)

Explanation: ***Prewarming the patient, using warm intravenous fluids, and maintaining room temperature*** - A comprehensive approach combines multiple strategies, addressing heat loss through various mechanisms like **radiation**, **convection**, **conduction**, and **evaporation**. - **Prewarming** the patient increases core body temperature before anesthesia, **warm intravenous fluids** prevent heat loss through fluid administration, and **maintaining room temperature** reduces heat loss to the environment. *Using warm intravenous fluids* - While helpful in preventing heat loss through conduction, this method alone is **insufficient** to prevent significant **perioperative hypothermia**. - It primarily addresses fluid-related heat loss but does not counteract heat loss due to other factors like a cold operating room or body surface exposure. *Maintaining room temperature* - This is an important step to reduce **convective and radiant heat loss** from the patient to the environment. - However, in isolation, it often cannot compensate for other significant heat losses, especially during prolonged surgeries or in patients highly susceptible to hypothermia. *Prewarming the patient* - **Prewarming** is a highly effective strategy to create a **core temperature thermal reserve** before the induction of anesthesia. - While crucial, using it as the sole method may not fully prevent hypothermia, as heat loss continues throughout the surgical process if other measures are not implemented.

Question 56: What is the most effective treatment for postoperative shivering following general anesthesia?

A. Pethidine (Correct Answer)
B. Piritramide
C. Methadone
D. Pentazocine

Explanation: ***Pethidine*** - **Pethidine** (meperidine) is an opioid with mild **alpha-2 adrenergic agonist properties**, which helps to inhibit shivering without excessive sedation. - Its mechanism of action primarily involves stimulating **kappa opioid receptors**, which are involved in thermoregulation. *Piritramide* - **Piritramide** is a powerful opioid analgesic often used for severe pain, but it lacks the specific anti-shivering effects of pethidine. - It primarily exerts its effects through **mu-opioid receptor agonism**, which is not directly linked to shivering suppression. *Methadone* - **Methadone** is a synthetic opioid primarily used for chronic pain management and opioid addiction. - While it has a long duration of action, it does not possess specific anti-shivering properties or the same thermoregulatory effects as pethidine. *Pentazocine* - **Pentazocine** is an opioid agonist-antagonist that can cause dysphoria and does not have specific efficacy for treating postoperative shivering. - Its primary action is through **kappa opioid receptors**, but it also has weak **mu-opioid receptor antagonist effects**, which can limit its analgesic and anti-shivering utility.

Question 57: At the end of anaesthesia after discontinuation of nitrous oxide and removal of endotracheal tube, 100% oxygen is administered to the patient to prevent:

A. Second gas effect
B. Bronchospasm
C. Hyperoxia
D. Diffusion Hypoxia (Correct Answer)

Explanation: ***Diffusion Hypoxia*** - Post-anaesthesia administration of 100% oxygen prevents **diffusion hypoxia**, a phenomenon where **nitrous oxide** rapidly diffuses out of the blood into the alveoli, diluting alveolar oxygen and carbon dioxide. - This rapid outflow of nitrous oxide can lead to a significant drop in **partial pressure of oxygen** in the alveoli, causing hypoxemia if not counteracted with high inspired oxygen. *Second gas effect* - The **second gas effect** refers to the phenomenon where the rapid uptake of a highly soluble anesthetic (like nitrous oxide) accelerates the uptake of a co-administered less soluble anesthetic. - This is an effect related to the **induction phase** of anesthesia, not emergence, and is distinct from the issues arising from nitrous oxide washout. *Bronchospasm* - **Bronchospasm** is an acute constriction of the bronchioles, often triggered by irritants, allergens, or certain medications. - While it can occur during emergence from anesthesia, it is not directly prevented by administering 100% oxygen and is typically managed with bronchodilators. *Hyperoxia* - **Hyperoxia** is a condition of excess oxygen in the body, which can be detrimental, but it is not the primary concern immediately following the discontinuation of nitrous oxide. - Administering 100% oxygen in this context is a **controlled, short-term measure** to prevent a more immediate and severe issue (hypoxia) rather than causing chronic hyperoxia.

Question 58: 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.

Question 59: What is the drug of choice for reversing muscle relaxants after anesthesia?

A. Pralidoxine
B. Neostigmine (Correct Answer)
C. Atropine
D. None of the options

Explanation: ***Neostigmine*** - **Neostigmine** is an **acetylcholinesterase inhibitor** that increases the amount of acetylcholine at the neuromuscular junction, thereby reversing the effects of non-depolarizing muscle relaxants. - It is often co-administered with an **anticholinergic agent** like atropine or glycopyrrolate to counteract its muscarinic side effects (e.g., bradycardia, increased secretions). *Pralidoxine* - **Pralidoxine (2-PAM)** is an **oxime cholinesterase reactivator** used primarily to treat organophosphate poisoning. - It works by regenerating acetylcholinesterase that has been inhibited by organophosphates, which is not the mechanism of action required for reversing typical muscle relaxants. *Atropine* - **Atropine** is an **anticholinergic drug** that blocks muscarinic acetylcholine receptors. - While it is often given with neostigmine to counteract muscarinic side effects like bradycardia, it does not directly reverse the neuromuscular blockade caused by muscle relaxants. *None of the options* - This option is incorrect because **neostigmine** is a well-established and commonly used drug for reversing non-depolarizing muscle relaxants.

Question 60: What is the MOST COMMON cause of apnea after anesthesia?

A. Prolonged anesthesia
B. Recurrent intubation leading to airway trauma
C. Neuromuscular blockade (Correct Answer)
D. None of the options

Explanation: ***Neuromuscular blockade*** - **Residual neuromuscular blockade** is a common and often preventable cause of **postoperative apnea** and hypoventilation, as it impairs the patient's ability to maintain an open airway and breathe adequately. - It results from insufficient reversal of **neuromuscular blocking agents (NMBAs)** used during surgery, leading to **weakness of respiratory muscles**. *Prolonged anesthesia* - While prolonged anesthesia can contribute to slower recovery and increased risk of respiratory depression, it is not the *most common* direct cause of **postoperative apnea** compared to residual NMBAs. - The effects of most **anesthetic agents** are usually reversible by the time the patient is extubated, although some residual effects might persist. *Recurrent intubation leading to airway trauma* - **Airway trauma** from recurrent intubation is a serious complication, but it primarily leads to issues like airway edema, bleeding, or vocal cord dysfunction, not typically **apnea**. - While airway issues can compromise breathing, apnea is more directly linked to problems with the **respiratory drive** or **muscle function**. *None of the options* - This option is incorrect because **residual neuromuscular blockade** is a well-established and frequent cause of **postoperative apnea**.

Practice by Chapter

Post-Anesthesia Care Unit Operations

Practice Questions

Emergence and Recovery from Anesthesia

Practice Questions

Postoperative Respiratory Care

Practice Questions

Postoperative Pain Management

Practice Questions

Postoperative Nausea and Vomiting

Practice Questions

Postoperative Cognitive Dysfunction

Practice Questions

Fluid Management in PACU

Practice Questions

Temperature Management

Practice Questions

Discharge Criteria

Practice Questions

Common PACU Complications

Practice Questions

Fast-Track Recovery

Practice Questions

Postoperative Delirium

Practice Questions

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