Ambulatory Anesthesia — MCQs

Ambulatory Anesthesia Indian Medical PG Practice Questions and MCQs

Question 11: Administration of which of the following anesthetic agents is associated with a reduced incidence of lightheadedness and rapid recovery?

A. Diazepam
B. Droperidol
C. Propofol (Correct Answer)
D. Midazolam

Explanation: **Explanation:** **Propofol** is the gold standard induction agent for ambulatory (day-care) surgery. Its primary advantage lies in its unique pharmacokinetic profile: it is highly lipophilic with a very high systemic clearance rate (exceeding hepatic blood flow), leading to a rapid decline in plasma concentration once the infusion or bolus is stopped. This results in **rapid emergence**, early return of cognitive function, and a significantly reduced incidence of postoperative "hangover" effects like lightheadedness and drowsiness compared to other intravenous agents. Furthermore, propofol possesses intrinsic **anti-emetic properties**, which further facilitates early discharge. **Why other options are incorrect:** * **Diazepam:** A long-acting benzodiazepine with active metabolites (e.g., desmethyldiazepam). It has a prolonged half-life and causes significant residual sedation and "hangover," making it unsuitable for rapid recovery. * **Midazolam:** While shorter-acting than diazepam, it still causes dose-dependent psychomotor impairment and anterograde amnesia. Recovery is slower compared to propofol, and it lacks anti-emetic benefits. * **Droperidol:** Primarily used as an anti-emetic or neuroleptic, it is associated with significant sedation, extrapyramidal side effects, and a risk of QT prolongation. It does not provide the rapid, clear-headed recovery required for ambulatory anesthesia. **High-Yield Clinical Pearls for NEET-PG:** * **Context-Sensitive Half-Time:** Propofol has a short context-sensitive half-time even after prolonged infusion, ensuring predictable recovery. * **PONV:** Propofol is the only induction agent that reduces Postoperative Nausea and Vomiting (PONV). * **Discharge Criteria:** The **Aldrete Score** or **PADSS** (Post-Anesthetic Discharge Scoring System) are used to determine if a patient is fit for discharge in ambulatory settings.

Question 12: Which of the following statements is true regarding day care anesthesia?

A. ASA physical status class 2 patients are not suitable for day care anesthesia.
B. Driving may be permitted within 24 hours post-procedure.
C. Pre-operative starvation is not mandatory.
D. Endotracheal intubation is acceptable for day care procedures. (Correct Answer)

Explanation: **Explanation:** Day care (ambulatory) anesthesia is designed for patients undergoing procedures that allow for discharge on the same day. The primary goal is a rapid return to baseline function with minimal complications. **Why Option D is Correct:** **Endotracheal intubation** is perfectly acceptable in day care settings. While Supraglottic Airway Devices (like LMA) are often preferred for shorter procedures to reduce postoperative sore throat, many day care surgeries (e.g., laparoscopic cholecystectomy) require muscle relaxation and controlled ventilation, necessitating an endotracheal tube. The use of an ETT does not preclude same-day discharge. **Analysis of Incorrect Options:** * **Option A:** ASA Physical Status **Class 1 and 2** are the ideal candidates for day care surgery. Stable Class 3 patients (whose systemic disease is well-controlled) are also increasingly accepted. Only unstable Class 3 or Class 4 patients are generally excluded. * **Option B:** Patients must be strictly instructed **not to drive**, operate heavy machinery, or sign legal documents for at least **24 hours** post-anesthesia. Residual effects of anesthetics can impair psychomotor function and judgment even if the patient feels "awake." * **Option C:** Pre-operative starvation (NPO) guidelines are **mandatory** and identical to inpatient surgery (2 hours for clear liquids, 6 hours for light meals) to prevent pulmonary aspiration. **High-Yield Clinical Pearls for NEET-PG:** * **Selection Criteria:** The "Social Criteria" are as important as medical ones; the patient must have a responsible adult to escort them home and stay with them for 24 hours. * **Discharge Scoring:** The **Aldrete Score** or the **PADSS (Post-Anesthetic Discharge Scoring System)** are used to determine fitness for discharge. A score of **≥ 9** is typically required. * **Common Complications:** Postoperative Nausea and Vomiting (PONV) and pain are the most common reasons for unanticipated hospital admission following day care surgery.

Question 13: Which of the following inhalational anesthetic agents has rapid onset and rapid recovery actions and is most desirable for use in outpatient surgical procedures?

A. Ether
B. Halothane
C. Trichloroethylene
D. Desflurane (Correct Answer)

Explanation: **Explanation:** The primary goal of **Ambulatory (Day-care) Anesthesia** is to ensure a rapid onset of anesthesia and, more importantly, a rapid, predictable recovery to allow for early discharge. **Why Desflurane is Correct:** The speed of induction and recovery of an inhalational agent is determined by its **Blood-Gas Partition Coefficient**. A lower coefficient means the gas is less soluble in blood, allowing the partial pressure in the alveoli (and subsequently the brain) to rise and fall rapidly. * **Desflurane** has the lowest blood-gas partition coefficient (**0.42**) among the options provided. * This low solubility ensures the fastest "wash-out" from the body once the agent is discontinued, making it the most desirable for outpatient procedures where quick emergence and psychomotor recovery are essential. **Analysis of Incorrect Options:** * **Ether:** Has a very high blood-gas partition coefficient (12.0), leading to extremely slow induction and prolonged recovery. It is also flammable and associated with high rates of post-operative nausea and vomiting (PONV). * **Halothane:** Has a coefficient of 2.4. It is slow to eliminate and carries risks of "Halothane Hepatitis" and cardiac arrhythmias. * **Trichloroethylene:** An obsolete agent with high solubility and slow recovery; it is also toxic to the cranial nerves when used with soda lime. **High-Yield Clinical Pearls for NEET-PG:** * **Solubility Order (Fastest to Slowest recovery):** Desflurane (0.42) > Sevoflurane (0.65) > Isoflurane (1.4) > Halothane (2.4). * **Desflurane** requires a special heated vaporizer (**Tec 6**) because of its high vapor pressure and low boiling point (23.5°C). * **Sevoflurane** is the agent of choice for **inhalational induction** in children because it is non-pungent, unlike Desflurane which is an airway irritant.

Question 14: Which of the following is the best indication for propofol as an intravenous induction agent?

A. Neurosurgery
B. Day care surgery (Correct Answer)
C. Patients with coronary artery disease
D. In neonates

Explanation: **Explanation:** Propofol is the induction agent of choice for **Day Care (Ambulatory) Surgery** due to its unique pharmacokinetic profile. **Why Day Care Surgery is the Correct Answer:** The primary goal in ambulatory anesthesia is a rapid, smooth recovery with minimal side effects to allow early discharge. Propofol facilitates this through: * **Rapid Onset and Short Duration:** Due to its high lipid solubility, it acts within 30–40 seconds, and its action is terminated quickly by **redistribution** (half-life of 2–8 minutes). * **Clear Headed Recovery:** Unlike thiopentone, it does not cause a "hangover" effect. * **Anti-emetic Properties:** It possesses intrinsic anti-emetic activity (sub-hypnotic doses of 10–20 mg), significantly reducing Postoperative Nausea and Vomiting (PONV), which is a leading cause of delayed discharge. **Analysis of Incorrect Options:** * **A. Neurosurgery:** While used for its ability to decrease Intracranial Pressure (ICP) and Cerebral Metabolic Rate ($CMRO_2$), it is not the "best" specific indication compared to its gold-standard status in day care. Thiopentone is also frequently used here. * **C. Coronary Artery Disease:** Propofol causes significant **hypotension** by decreasing systemic vascular resistance (SVR) and myocardial contractility. Etomidate is preferred in cardiac patients due to its hemodynamic stability. * **D. Neonates:** Propofol is generally avoided for induction in neonates due to risks of profound hypotension and the potential for **Propofol Infusion Syndrome (PRIS)** during prolonged use. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Acts via $GABA_A$ receptors (increases chloride conductance). * **Pain on Injection:** Most common side effect; can be mitigated by using a large vein or pre-treatment with Lidocaine. * **Egg/Soy Allergy:** Use with caution as the emulsion contains egg lecithin and soybean oil. * **Preservative:** EDTA is added to prevent bacterial growth.

Question 15: Which combination of drugs is best suited for daycare surgery?

A. Atracurium, morphine, isoflurane
B. Mivacurium, fentanyl, sevoflurane (Correct Answer)
C. Atracurium, remifentanil, halothane
D. Mivacurium, pethidine, desflurane

Explanation: ### Explanation The primary goal of **Ambulatory (Daycare) Anesthesia** is to ensure rapid induction, stable intraoperative maintenance, and, most importantly, **rapid emergence and recovery** to allow for early discharge. This requires drugs with short half-lives, minimal organ accumulation, and low side-effect profiles (like postoperative nausea and vomiting). **Why Option B is Correct:** * **Mivacurium:** A short-acting non-depolarizing neuromuscular blocker metabolized by plasma cholinesterase. It has the shortest duration of action among non-depolarizing agents, making it ideal for short procedures. * **Fentanyl:** A potent, short-acting opioid. While remifentanil is shorter, fentanyl is a standard, reliable choice for daycare surgery due to its predictable offset compared to morphine or pethidine. * **Sevoflurane:** Has a low blood-gas partition coefficient (0.65), allowing for rapid induction and emergence. It is non-irritating to the airway, making it the agent of choice for mask induction. **Analysis of Incorrect Options:** * **Option A:** **Isoflurane** has a higher blood-gas solubility than sevoflurane/desflurane, leading to slower recovery. **Morphine** has a long duration of action and a high incidence of postoperative nausea/vomiting (PONV), which delays discharge. * **Option C:** **Halothane** is contraindicated in daycare due to its high solubility (slow recovery), risk of arrhythmias, and "halothane hepatitis." **Atracurium** has a longer duration than mivacurium. * **Option D:** **Pethidine** (Meperidine) has a long-acting toxic metabolite (normeperidine) and causes significant sedation and vomiting, making it unsuitable for rapid discharge. **Clinical Pearls for NEET-PG:** 1. **Gold Standard Inhalational Agent:** **Desflurane** has the fastest recovery (lowest blood-gas solubility 0.42), but **Sevoflurane** is preferred for induction as Desflurane is pungent and causes laryngospasm. 2. **Propofol** is the induction agent of choice for daycare surgery due to its rapid metabolism and inherent **anti-emetic** properties. 3. **Discharge Criteria:** The **Aldrete Score** or **PADSS** (Post-Anesthetic Discharge Scoring System) is used to determine if a patient is fit for home discharge (Score ≥ 9).

Question 16: A patient at 38 weeks of gestation with pre-eclampsia is started on oxytocin to augment her labor and requests epidural analgesia. What are the key anesthetic considerations?

A. No workup is required prior to performing epidural anesthesia, as this will treat her hypertension.
B. The presence of hypertension and edema requires further workup before proceeding with epidural anesthesia. (Correct Answer)
C. Neuraxial anesthesia should be avoided due to an increased risk of bleeding.
D. Systemic opiates should be avoided as the risk of respiratory depression is too high.

Explanation: **Explanation:** In a patient with **pre-eclampsia**, the primary anesthetic concern is the multisystem involvement of the disease, particularly **coagulopathy** and **airway edema**. 1. **Why Option B is Correct:** Pre-eclampsia is characterized by endothelial dysfunction. This leads to a risk of **thrombocytopenia** (low platelet count) and potential coagulopathy (HELLP syndrome). Before performing an epidural, a recent **platelet count** is mandatory to rule out the risk of a spinal-epidural hematoma. Furthermore, generalized edema often involves the upper airway, increasing the risk of a "difficult airway" should general anesthesia be required. Thus, a thorough workup (CBC, LFTs, KFTs, and airway assessment) is essential. 2. **Why Other Options are Incorrect:** * **Option A:** While epidural analgesia can help lower blood pressure by reducing sympathetic tone and pain, it is **not** a primary treatment for hypertension. Proceeding without a workup (especially a platelet count) is dangerous. * **Option C:** Neuraxial anesthesia is actually the **preferred** technique in pre-eclampsia as it avoids the risks of airway management and the hypertensive response to intubation. It is only avoided if there is documented coagulopathy (Platelets < 75,000-100,000/mm³). * **Option D:** Systemic opiates are not contraindicated, though they are less effective than neuraxial techniques and require fetal monitoring. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Epidural analgesia is the preferred method for labor pain in pre-eclampsia. * **Platelet Cut-off:** Most guidelines suggest a minimum platelet count of **75,000–80,000/mm³** for safe neuraxial placement. * **Drug of Choice:** Magnesium Sulfate ($MgSO_4$) is used for seizure prophylaxis; remember it **potentiates** both depolarizing and non-depolarizing muscle relaxants.

Question 17: A 38-year-old man is scheduled for the extraction of his last molar tooth under general anesthesia as a day care procedure. He wishes to resume work after 6 hours. Which one of the following induction agents is preferred for this scenario?

A. Thiopentone sodium
B. Ketamine
C. Diazepam
D. Propofol (Correct Answer)

Explanation: **Explanation:** The primary goal of **Ambulatory (Day Care) Anesthesia** is to ensure a rapid recovery, early discharge, and minimal postoperative side effects. **Why Propofol is the Correct Answer:** Propofol is the "gold standard" induction agent for day-care surgery. Its pharmacokinetic profile is characterized by a **rapid onset** and an **ultra-short duration of action** due to rapid redistribution and high metabolic clearance. Most importantly, it is associated with a "clear-headed" recovery and possesses significant **anti-emetic properties**, reducing the risk of Postoperative Nausea and Vomiting (PONV)—the leading cause of delayed discharge in ambulatory settings. **Analysis of Incorrect Options:** * **Thiopentone sodium:** While it has a rapid onset, it undergoes slow metabolism and can lead to a "hangover effect" due to its accumulation in fat stores, delaying the patient's return to work. * **Ketamine:** It is generally avoided in day-care settings because it causes emergence delirium, hallucinations, and prolonged recovery times. * **Diazepam:** This is a long-acting benzodiazepine with active metabolites. It causes prolonged sedation and psychomotor impairment, making it unsuitable for a patient wishing to resume work within 6 hours. **High-Yield Clinical Pearls for NEET-PG:** * **Propofol** is the induction agent of choice for day-care surgery, TIVA (Total Intravenous Anesthesia), and ECT. * **Desflurane** is the inhalational agent of choice for day-care surgery due to its lowest blood-gas solubility (rapid emergence). * **Criteria for Discharge:** The **Aldrete Score** or **PADSS** (Post-Anesthetic Discharge Scoring System) is used to assess readiness for discharge. * **Street Fitness:** A patient is considered "street fit" when they are oriented, stable, and can ambulate without assistance, but they must still be accompanied by a responsible adult.

Question 18: Regarding suxamethonium-induced apnea, all are true except:

A. It is caused by suxamethonium.
B. It can be inherited.
C. It is due to a deficiency of cholinesterase. (Correct Answer)
D. Mortality is very low in recent times with proper management.

Explanation: **Explanation:** Suxamethonium (Succinylcholine) is a depolarizing neuromuscular blocker typically characterized by a short duration of action (5–10 minutes) because it is rapidly hydrolyzed by the enzyme **Pseudocholinesterase** (also known as Butyrylcholinesterase or Plasma Cholinesterase). **Why Option C is the correct answer (The "Except" statement):** The statement "It is due to a deficiency of cholinesterase" is technically inaccurate in the context of competitive exams. Suxamethonium apnea is primarily caused by a **qualitative defect** (atypical enzyme) rather than a simple quantitative deficiency. While a low level of normal enzyme can prolong the block slightly, clinically significant prolonged apnea (lasting hours) is almost always due to an **inherited genetic variant** (autosomal recessive) where the enzyme has a low affinity for the drug. **Analysis of other options:** * **Option A:** True. The condition is specifically a prolonged neuromuscular blockade following the administration of suxamethonium. * **Option B:** True. It is an inherited pharmacogenetic disorder. The most common variant is the **Atypical gene ($E_a$)**. * **Option D:** True. With modern anesthetic management, including mechanical ventilation and sedation until the block wears off naturally, mortality is extremely low. **High-Yield Clinical Pearls for NEET-PG:** * **Dibucaine Number:** Used to diagnose the condition. Dibucaine inhibits normal pseudocholinesterase by 80%, but atypical enzyme by only 20%. * *Normal:* 80 * *Heterozygous:* 40–60 * *Homozygous (Atypical):* 20 (This patient will have prolonged apnea). * **Management:** The treatment of choice is **continued sedation and mechanical ventilation** until muscle power returns. Fresh Frozen Plasma (FFP) contains the enzyme but is generally avoided due to infection risks. * **Drugs to avoid:** Avoid Mivacurium, as it is also metabolized by pseudocholinesterase.

Question 19: Which induction agent is preferred for daycare surgery?

A. Ketamine
B. Diazepam
C. Thiopentone
D. Propofol (Correct Answer)

Explanation: **Explanation:** The primary goal of **Ambulatory (Daycare) Anesthesia** is to ensure rapid induction, smooth maintenance, and, most importantly, **rapid recovery** with minimal side effects, allowing the patient to be discharged safely on the same day. **Why Propofol is the Correct Choice:** Propofol is the "Gold Standard" for daycare surgery due to its unique pharmacokinetic profile. It has a **rapid onset** and a **very short duration of action** (due to rapid redistribution and high metabolic clearance). Key advantages include: * **Rapid and Clear Recovery:** Patients wake up quickly without a "hangover" effect. * **Antiemetic Properties:** It significantly reduces Postoperative Nausea and Vomiting (PONV), which is a leading cause of delayed discharge. * **Suppression of Laryngeal Reflexes:** This makes it ideal for the insertion of a Laryngeal Mask Airway (LMA), commonly used in short procedures. **Analysis of Incorrect Options:** * **A. Ketamine:** Associated with a high incidence of **emergence delirium**, hallucinations, and prolonged recovery time, making it unsuitable for rapid discharge. * **B. Diazepam:** A long-acting benzodiazepine with active metabolites. It causes **prolonged sedation** and psychomotor impairment. * **C. Thiopentone:** While it has a rapid onset, it undergoes slow metabolism and can lead to a **"hangover effect"** due to its cumulative properties, delaying the patient's return to baseline mental status. **High-Yield Clinical Pearls for NEET-PG:** * **Induction agent of choice for Daycare Surgery:** Propofol. * **Maintenance agent of choice (Inhalational):** Desflurane (fastest recovery) or Sevoflurane. * **Goldman’s Criteria:** Used for cardiac risk stratification in non-cardiac surgery. * **Aldrete Score:** Used to assess recovery and readiness for discharge from the PACU (Post-Anesthesia Care Unit). A score of $\geq$ 9 is typically required for discharge.

Question 20: Which of the following drugs is NOT used for day care surgery?

A. Propofol
B. Sevoflurane
C. Doxacurium (Correct Answer)
D. Desflurane

Explanation: **Explanation:** The primary goal of **Ambulatory (Day Care) Anesthesia** is to ensure rapid induction, stable maintenance, and, most importantly, **rapid recovery** with minimal side effects (nausea/vomiting), allowing the patient to be discharged safely on the same day. **Why Doxacurium is the Correct Answer:** Doxacurium is a long-acting non-depolarizing neuromuscular blocking agent (NMBA). It has a slow onset and a very long duration of action (exceeding 90–120 minutes). In day care surgery, long-acting agents are avoided because they increase the risk of residual neuromuscular blockade, delayed recovery, and respiratory complications, which prevent early discharge. **Analysis of Incorrect Options:** * **Propofol (Option A):** The gold standard for intravenous induction in day care. It has a rapid onset and a very short context-sensitive half-life, leading to clear-headed recovery and an anti-emetic effect. * **Sevoflurane (Option B):** A preferred inhalational agent due to its low blood-gas solubility (0.65), which ensures fast induction and emergence. It is non-pungent, making it ideal for pediatric mask induction. * **Desflurane (Option C):** Has the lowest blood-gas solubility (0.42) among potent volatile agents, allowing for the fastest emergence and recovery, even after prolonged surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Muscle Relaxants for Day Care:** Mivacurium (short-acting) or intermediate-acting agents like Atracurium, Cisatracurium, and Rocuronium (especially if Sugammadex is available for reversal). * **Discharge Criteria:** The **Aldrete Score** or **PADSS** (Post-Anesthetic Discharge Scoring System) is used to determine if a patient is fit for discharge. * **Fast-tracking:** The process of bypassing the PACU (Phase I recovery) and moving directly to Phase II recovery, often achieved using drugs like Desflurane and Propofol.

Practice by Chapter

Patient Selection for Ambulatory Surgery

Practice Questions

Preoperative Assessment for Outpatients

Practice Questions

Anesthetic Techniques for Ambulatory Surgery

Practice Questions

Fast-Track Recovery Protocols

Practice Questions

Post-Discharge Analgesia

Practice Questions

Preventing PONV in Outpatients

Practice Questions

Perioperative Management of Sleep Apnea

Practice Questions

Discharge Criteria

Practice Questions

Common Complications After Ambulatory Surgery

Practice Questions

Management of Diabetic Patients

Practice Questions

Geriatric Ambulatory Anesthesia

Practice Questions

Quality Improvement in Ambulatory Surgery

Practice Questions

Want unlimited practice?

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

Start For Free