Postoperative Care — MCQs

A 63-year-old man with a 40-pack per year smoking history undergoes a low anterior resection for rectal cancer and on postoperative day 5 develops a fever, new infiltrate on chest x-ray, and leukocytosis. He is transferred to the ICU for treatment of his pneumonia because of clinical deterioration. Which of the following is a sign of early sepsis?

Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 11: Post-anesthetic nausea and vomiting is uncommon with which of the following agents?

A. Propofol (Correct Answer)
B. Halothane
C. Fentanyl
D. Sufentanil

Explanation: **Explanation:** **Propofol** is the correct answer because it possesses unique **anti-emetic properties**. Unlike most anesthetic agents, propofol directly modulates the chemoreceptor trigger zone (CTZ) and decreases dopaminergic activity in the area postrema. It is considered the drug of choice for Total Intravenous Anesthesia (TIVA) specifically to reduce the incidence of Postoperative Nausea and Vomiting (PONV). **Analysis of Incorrect Options:** * **Halothane (Option B):** Inhalational agents (volatile anesthetics) are a primary risk factor for PONV. They trigger the vomiting center during the emergence phase of anesthesia. * **Fentanyl & Sufentanil (Options C & D):** These are potent opioids. Opioids are notorious for causing nausea and vomiting by increasing the sensitivity of the vestibular apparatus, delaying gastric emptying, and directly stimulating the CTZ in the medulla. **Clinical Pearls for NEET-PG:** * **Gold Standard for PONV Prophylaxis:** Propofol (TIVA) is the most effective anesthetic strategy to prevent PONV. * **Apfel Score:** A high-yield clinical tool used to predict PONV risk. Key risk factors include: Female gender, non-smoker status, history of motion sickness/PONV, and postoperative opioid use. * **Emetic Potential:** Nitrous oxide ($N_2O$) and Etomidate are also associated with a high incidence of PONV compared to Propofol. * **Management:** The first-line treatment for established PONV often includes 5-HT3 receptor antagonists (e.g., Ondansetron) or Dexamethasone.

Question 12: Post-operative vomiting is reduced and the patient is able to ambulate sooner with the use of which of the following agents?

A. Ketamine
B. Enflurane
C. Propofol (Correct Answer)
D. Remifentanil

Explanation: **Explanation** The correct answer is **Propofol**. **1. Why Propofol is Correct:** Propofol is the induction agent of choice for Day Care Surgery (Ambulatory Surgery) due to its unique pharmacological profile. It possesses potent **anti-emetic properties**, likely mediated through its action on the chemoreceptor trigger zone (CTZ) and subcortical pathways. By significantly reducing Post-Operative Nausea and Vomiting (PONV), it facilitates earlier oral intake and faster recovery. Furthermore, Propofol has a rapid onset and a very short context-sensitive half-life, leading to "clear-headed" recovery with minimal residual sedation, allowing patients to ambulate sooner. **2. Why Other Options are Incorrect:** * **Ketamine:** Known for causing emergence delirium, hallucinations, and vivid dreams. It does not have anti-emetic properties and may actually increase the risk of nausea. * **Enflurane:** Like most volatile inhalational anesthetics, Enflurane is a significant risk factor for PONV. It also has a slower elimination profile compared to modern agents like Sevoflurane or Desflurane, delaying discharge. * **Remifentanil:** While it is an ultra-short-acting opioid, all opioids are notorious for causing dose-dependent nausea and vomiting (PONV), which hinders early ambulation. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for TIVA:** Propofol is the mainstay of Total Intravenous Anesthesia (TIVA). * **PONV Reduction:** Propofol is the only induction agent with intrinsic anti-emetic activity (sub-hypnotic doses of 10–20 mg can be used to treat refractory vomiting). * **Day Care Surgery:** The "ideal" anesthetic for day care should have rapid onset, rapid recovery, and minimal side effects (no PONV/shivering). Propofol fits this best. * **Mnemonic:** Propofol = **P**ost-op **P**eace (No vomiting, fast wake-up).

Question 13: Which of the following drugs is commonly used for post-anesthetic shivering?

A. Meperidine (Correct Answer)
B. Methylmorphine
C. Methadone
D. Morphine

Explanation: **Explanation:** **Post-anesthetic shivering (PAS)** is a common complication occurring in up to 40% of patients recovering from general anesthesia. It is primarily caused by intraoperative hypothermia and the effects of anesthetic agents on thermoregulatory control. **Why Meperidine is the Correct Choice:** **Meperidine (Pethidine)** is considered the drug of choice for treating post-anesthetic shivering. Unlike other opioids, meperidine possesses unique **anti-shivering properties** mediated through its potent agonist activity at **$\kappa$ (kappa) opioid receptors** and its inhibitory effect on the $\alpha_2$-adrenoceptor. It effectively lowers the shivering threshold (the core temperature at which the body initiates shivering) more significantly than it lowers the vasoconstriction threshold, providing rapid relief. **Analysis of Incorrect Options:** * **B. Methylmorphine (Codeine):** This is a weak opioid primarily used as an antitussive or for mild pain; it has no significant effect on the thermoregulatory center. * **C. Methadone:** A long-acting $\mu$-opioid agonist used for chronic pain and opioid withdrawal; it lacks the specific $\kappa$-receptor profile required to suppress shivering effectively. * **D. Morphine:** While morphine is a potent analgesic, it acts primarily on $\mu$-receptors. It is significantly less effective than meperidine in treating PAS and requires much higher doses to achieve a similar effect, increasing the risk of respiratory depression. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Meperidine reduces the shivering threshold via $\kappa$-receptors and $\alpha_2$ agonism. * **Dose:** A low intravenous dose (12.5–25 mg) is usually sufficient for PAS. * **Other Drugs:** Alpha-2 agonists (Clonidine, Dexmedetomidine) and Tramadol are also effective alternatives. * **Gold Standard Prevention:** Forced-air warming (Bair Hugger) is the most effective non-pharmacological method to prevent PAS.

Question 14: After undergoing a left pneumonectomy, a female patient has a chest tube in place for drainage. When caring for this patient, what is an essential nursing intervention?

A. Monitor fluctuations in the water-seal chamber
B. Clamp the chest tube once every shift
C. Encourage coughing and deep breathing (Correct Answer)
D. Milk the chest tube every 2 hours

Explanation: ### Explanation **Correct Option: C. Encourage coughing and deep breathing** In the postoperative period following thoracic surgery, the primary goal is to prevent atelectasis and pneumonia. Encouraging the patient to cough and perform deep breathing (often using incentive spirometry) facilitates lung expansion of the remaining lung tissue, mobilizes secretions, and improves gas exchange. For a pneumonectomy patient, maintaining the health of the remaining lung is critical for survival. **Analysis of Incorrect Options:** * **A. Monitor fluctuations in the water-seal chamber:** While true for most thoracic surgeries (lobectomy/wedge resection), it is **not** standard for a pneumonectomy. In a pneumonectomy, the chest tube is often clamped or connected to a balanced drainage system. We do not want "tidaling" or significant fluctuations because the goal is to allow the empty hemithorax to fill with fluid/serosanguinous exudate to prevent mediastinal shift. * **B. Clamp the chest tube once every shift:** Routine clamping is dangerous as it can lead to a tension pneumothorax if there is an active air leak. In pneumonectomy, the tube is usually clamped *initially* and only opened briefly to balance pressure or drain excess fluid under strict orders. * **D. Milk the chest tube every 2 hours:** "Milking" or "stripping" chest tubes is generally contraindicated as it creates high negative intrapleural pressure, which can damage lung tissue or the bronchial stump. **NEET-PG High-Yield Pearls:** 1. **Post-Pneumonectomy Positioning:** The patient should be positioned on the **operative side** (back or slightly towards the side of the surgery) to allow the remaining "good" lung to be uppermost for maximum expansion and to prevent fluid from the surgical cavity from draining into the healthy bronchus in case of a stump leak. 2. **Mediastinal Shift:** A major complication after pneumonectomy. If the trachea shifts significantly toward the unoperated side, it indicates a tension pneumothorax or excessive fluid buildup. 3. **Fluid Management:** These patients are at high risk for **Post-Pneumonectomy Pulmonary Edema**; therefore, cautious IV fluid administration is mandatory.

Question 15: Which of the following drugs is believed to be effective in the treatment of postoperative shivering?

A. Ondansetron
B. Diclofenac sodium
C. Pethidine (Correct Answer)
D. Paracetamol

Explanation: **Explanation:** **Postoperative Shivering (POS)** is a common complication following general or spinal anesthesia, occurring in up to 40% of patients. It increases oxygen consumption, CO2 production, and metabolic rate, which can be detrimental in patients with limited cardiac or respiratory reserve. **Why Pethidine is the Correct Answer:** Pethidine (Meperidine) is considered the **gold standard** and the most effective drug for treating postoperative shivering. Unlike other opioids, pethidine has unique **agonist activity at the κ (kappa) opioid receptors** and also inhibits the reuptake of serotonin and norepinephrine. These actions significantly lower the shivering threshold in the hypothalamus, effectively suppressing the thermoregulatory response more efficiently than pure μ-agonists like morphine or fentanyl. **Analysis of Incorrect Options:** * **Ondansetron (A):** While some studies suggest 5-HT3 antagonists may have a prophylactic role in preventing shivering by modulating central temperature regulation, they are not the primary treatment of choice once shivering has started. * **Diclofenac Sodium (B) & Paracetamol (D):** These are Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) and non-opioid analgesics. While excellent for postoperative pain management, they do not act on the central thermoregulatory mechanisms required to stop shivering. **Clinical Pearls for NEET-PG:** * **Mechanism of POS:** It is primarily caused by intraoperative core hypothermia and the "resetting" of the thermoregulatory threshold as anesthesia wears off. * **Dose of Pethidine:** A low dose (10–25 mg IV) is usually sufficient to stop shivering. * **Other Drugs:** Other agents used for prevention/treatment include **Tramadol**, **Clonidine**, and **Dexmedetomidine** (α2 agonists). * **Non-Pharmacological:** Forced-air warming (Bair Hugger) is the most effective way to prevent hypothermia intraoperatively.

Question 16: Which drug is used for the postoperative reversal of muscular paralysis?

A. Neostigmine (Correct Answer)
B. Pyridostigmine
C. Physostigmine
D. D-tubocurarine

Explanation: **Explanation:** The reversal of neuromuscular blockade (NMB) is a critical step in postoperative care to ensure the return of spontaneous respiration and airway protection. **1. Why Neostigmine is the Correct Answer:** Neostigmine is the drug of choice for reversing non-depolarizing neuromuscular blockers (like Vecuronium or Rocuronium). It is an **anticholinesterase** agent that inhibits the enzyme acetylcholinesterase. This leads to an accumulation of acetylcholine at the motor endplate, which outcompetes the muscle relaxant molecules for nicotinic receptors, thereby restoring muscle contraction. Because it also causes parasympathetic side effects (bradycardia, secretions), it is always co-administered with an antimuscarinic agent like **Glycopyrrolate** or Atropine. **2. Analysis of Incorrect Options:** * **B. Pyridostigmine:** While also an anticholinesterase, it has a slower onset and longer duration of action. It is primarily used for the long-term maintenance treatment of **Myasthenia Gravis** rather than acute postoperative reversal. * **C. Physostigmine:** This is a tertiary amine that **crosses the blood-brain barrier**. It is used to treat central anticholinergic syndrome (e.g., Atropine overdose) but is not used for NMB reversal due to its central nervous system effects. * **D. D-tubocurarine:** This is a non-depolarizing neuromuscular blocker itself. Administering it would worsen paralysis rather than reverse it. **High-Yield Clinical Pearls for NEET-PG:** * **Sugammadex:** A newer, specific reversal agent for Rocuronium and Vecuronium that works by encapsulation (chelation), avoiding the side effects of anticholinesterases. * **Reversal Criteria:** Reversal should only be attempted when there is evidence of spontaneous recovery (e.g., at least 2 responses on a **Train-of-Four [TOF]** stimulation). * **Edrophonium:** Another anticholinesterase with a very rapid onset, historically used for the Tensilon test in Myasthenia Gravis.

Question 17: Postoperative shivering is treated with which of the following?

A. Diazepam
B. Antihistaminics
C. Anticholinergics
D. Pethidine (Correct Answer)

Explanation: **Explanation:** Postoperative shivering (POS) is a common complication occurring in up to 40% of patients recovering from general or regional anesthesia. It is primarily a thermoregulatory response to core hypothermia caused by anesthetic-induced vasodilation and the inhibition of the hypothalamus. **Why Pethidine is the Correct Answer:** **Pethidine (Meperidine)** is considered the **drug of choice** for treating postoperative shivering. Unlike other opioids, pethidine acts specifically on **κ (kappa) receptors** and **α-2 adrenoceptors** in the shivering center of the spinal cord and hypothalamus. It effectively lowers the shivering threshold (the temperature at which the body starts shivering) more significantly than it lowers the vasoconstriction threshold, providing rapid relief. **Analysis of Incorrect Options:** * **A. Diazepam:** A benzodiazepine used for sedation and muscle relaxation. While it may reduce the psychological distress of shivering, it does not act on the thermoregulatory center to stop the process. * **B. Antihistaminics:** These are used for allergic reactions or as mild sedatives (e.g., Promethazine); they have no established role in treating thermoregulatory shivering. * **C. Anticholinergics:** Drugs like Atropine or Glycopyrrolate are used to reduce secretions or treat bradycardia; they do not influence the shivering threshold. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of POS:** Volatile anesthetics cause peripheral vasodilation, leading to "redistribution hypothermia." * **Other Drugs for POS:** If Pethidine is unavailable, other effective agents include **Tramadol**, **Clonidine**, and **Dexmedetomidine**. * **Non-Pharmacological Management:** Forced-air warming blankets (Bair Hugger) are the most effective way to prevent and treat POS by restoring core temperature. * **Complications of Shivering:** It can increase oxygen consumption by up to **300-400%**, which is dangerous for patients with limited cardiac reserve (CAD).

Question 18: Which drug worsens post-cardiothoracic surgery delirium?

A. Antipsychotics
B. Benzodiazepines
C. Anticholinergic agents (Correct Answer)
D. Antihistamines

Explanation: **Explanation:** Postoperative delirium (POD) is a common complication following cardiothoracic surgery, characterized by acute fluctuations in mental status, inattention, and disorganized thinking. **Why Anticholinergic agents are the correct answer:** The "Cholinergic Hypothesis" of delirium suggests that a relative deficiency in central acetylcholine levels is a primary driver of cognitive dysfunction. **Anticholinergic agents** (e.g., atropine, scopolamine, or drugs with anticholinergic side effects) directly antagonize muscarinic receptors in the brain. This leads to impaired neurotransmission, worsening confusion, hallucinations, and agitation. In the elderly or post-bypass patients (who may have pre-existing cerebral microemboli), these drugs significantly increase the risk and severity of delirium. **Analysis of Incorrect Options:** * **Antipsychotics (A):** Low-dose antipsychotics (e.g., Haloperidol or Quetiapine) are actually the first-line pharmacological treatment for managing the symptoms of hyperactive delirium, though they do not prevent it. * **Benzodiazepines (B):** While benzodiazepines are generally avoided in delirium because they can cause "paradoxical agitation" or over-sedation, they are not the primary biochemical trigger in the same way anticholinergics are. They are specifically indicated if delirium is due to alcohol or sedative withdrawal. * **Antihistamines (D):** While first-generation antihistamines (like diphenhydramine) have anticholinergic properties and can worsen delirium, "Anticholinergic agents" as a class is the more specific and definitive answer for the underlying mechanism. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type of POD:** Hypoactive delirium (often missed). * **Drug of choice for treatment:** Haloperidol (IV/IM). * **Key Risk Factors:** Advanced age, pre-existing cognitive impairment, and use of the Cardiopulmonary Bypass (CPB) machine. * **Prevention:** Early mobilization, sleep hygiene, and avoiding the "Beers Criteria" medications (including anticholinergics).

Question 19: Postoperative shivering in the perioperative period is associated with what physiological change?

A. Increase in oxygen consumption (Correct Answer)
B. Decreased catecholamine release
C. Decreased heart rate and blood pressure
D. All of the above

Explanation: **Explanation:** Postoperative shivering (POS) is a common involuntary muscular activity occurring during recovery from general or regional anesthesia. It is primarily a thermoregulatory response to core hypothermia or the effects of anesthetic agents on the hypothalamus. **Why Option A is Correct:** Shivering involves intense, rhythmic skeletal muscle contractions. This metabolic activity significantly increases the body's demand for energy. Consequently, **oxygen consumption ($VO_2$) can increase by 200% to 500%**. This massive surge in oxygen demand can lead to hypoxemia, lactic acidosis, and increased carbon dioxide production, which is particularly dangerous in patients with limited cardiac or pulmonary reserve. **Why Other Options are Incorrect:** * **Option B:** Shivering triggers a **sympathetic nervous system surge**, leading to an *increase* in catecholamine release (norepinephrine and epinephrine), not a decrease. * **Option C:** Due to the sympathetic surge and increased metabolic demand, patients typically experience **tachycardia (increased heart rate) and hypertension (increased blood pressure)**. This increases myocardial oxygen demand and can precipitate myocardial ischemia or infarction in high-risk patients. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Anesthetics cause peripheral vasodilation and inhibit the shivering threshold in the hypothalamus, leading to core-to-peripheral heat redistribution. * **Drug of Choice:** **Pethidine (Meperidine)** is the gold standard for treating postoperative shivering (dose: 10–25 mg IV). It acts on $\kappa$-opioid receptors to lower the shivering threshold. * **Other agents:** Clonidine, Tramadol, and Dexmedetomidine are also used for prevention and treatment. * **Complications:** Beyond metabolic stress, shivering increases intraocular and intracranial pressure and can cause wound dehiscence due to mechanical strain.

Question 20: A 63-year-old man with a 40-pack per year smoking history undergoes a low anterior resection for rectal cancer and on postoperative day 5 develops a fever, new infiltrate on chest x-ray, and leukocytosis. He is transferred to the ICU for treatment of his pneumonia because of clinical deterioration. Which of the following is a sign of early sepsis?

A. Respiratory acidosis
B. Decreased cardiac output
C. Hypoglycemia
D. Peripheral vasodilation (Correct Answer)

Explanation: **Explanation** The clinical presentation of fever, new pulmonary infiltrate, and leukocytosis in a postoperative patient suggests **Hospital-Acquired Pneumonia (HAP)** progressing to **Sepsis**. **1. Why Peripheral Vasodilation is Correct:** In the early stages of sepsis (often called **"Warm Shock"** or Hyperdynamic phase), the body releases inflammatory mediators (such as Nitric Oxide, Prostaglandins, and Cytokines). These mediators cause significant **peripheral vasodilation** and a decrease in systemic vascular resistance (SVR). To compensate for this drop in SVR and maintain tissue perfusion, the heart increases its rate and stroke volume, leading to a high cardiac output and warm, flushed extremities. **2. Why the Other Options are Incorrect:** * **Respiratory Acidosis:** Early sepsis typically presents with **Respiratory Alkalosis**. The inflammatory response and fever stimulate the respiratory center, causing tachypnea and "blowing off" CO₂, leading to a rise in pH. * **Decreased Cardiac Output:** This is a feature of **late sepsis** (Cold Shock) or cardiogenic shock. In early sepsis, the cardiac output is characteristically **increased** (Hyperdynamic state). * **Hypoglycemia:** Sepsis is a stress state that triggers the release of cortisol and catecholamines, which promote gluconeogenesis and glycogenolysis. Therefore, **hyperglycemia** (stress-induced) is the common finding. Hypoglycemia is rare and usually signifies hepatic failure or exhaustion of glycogen stores in end-stage sepsis. **Clinical Pearls for NEET-PG:** * **Hemodynamic Profile of Early Sepsis:** ↓ SVR, ↑ Cardiac Output, ↑ Mixed Venous Oxygen Saturation (SvO₂). * **qSOFA Score:** A quick bedside tool for sepsis—1. Altered mental status (GCS <15), 2. Systolic BP ≤100 mmHg, 3. Respiratory rate ≥22/min. * **Postoperative Fever (The 5 W's):** This patient (POD 5) fits the timeline for **W**ind (Pneumonia) or **W**ound (Infection).

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

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