Preoperative Evaluation and Management — MCQs
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A six-year-old boy is scheduled for examination of the eye under anesthesia. The father informed that for the past six months the child has been developing progressive weakness of both legs. His elder sibling had died at the age of 14 years. Which drug would you definitely avoid during the anesthetic management?
Which of the following best describes a patient classified as ASA -3?
Why is glycopyrrolate used as pre-anesthetic medication?
According to the American Society of Anesthesiologists' Physical Status Classification System, what does P2 represent?
Which of the following medications can be safely stopped prior to abdominal surgery?
Ketamine should be avoided in which of the following conditions?
A 60-year-old man with a history of coronary artery disease and a drug-eluting stent placed one year ago presents with an abdominal lump and is scheduled for laparoscopic diagnostic evaluation. He also has hypertension. Which of the following medications should be discontinued prior to the procedure?
According to AHA/ACC guidelines, which of the following surgeries is associated with a low risk requiring no preoperative cardiac testing in patients with known coronary artery disease?
What is the maximum recommended interval between the implantation of a bare metal cardiac stent and elective surgery?
Which muscle relaxant is the drug of choice in patients with renal and hepatic failure?
Preoperative Evaluation and Management Indian Medical PG Practice Questions and MCQs
Question 1: A six-year-old boy is scheduled for examination of the eye under anesthesia. The father informed that for the past six months the child has been developing progressive weakness of both legs. His elder sibling had died at the age of 14 years. Which drug would you definitely avoid during the anesthetic management?
- A. Succinylcholine (Correct Answer)
- B. Thiopentone
- C. Nitrous oxide
- D. Vecuronium
Explanation: **Explanation:** The clinical presentation of progressive leg weakness in a young boy, combined with a family history of early sibling death, is highly suggestive of **Duchenne Muscular Dystrophy (DMD)**. **Why Succinylcholine is avoided:** In patients with myopathies like DMD, the muscle cell membranes (sarcolemma) are unstable. Administration of Succinylcholine, a depolarizing muscle relaxant, can trigger massive efflux of potassium from the muscle cells into the bloodstream. This **acute hyperkalemia** can lead to intractable cardiac arrest. Furthermore, Succinylcholine can trigger **Rhabdomyolysis** (manifesting as myoglobinuria) and is associated with an increased risk of **Malignant Hyperthermia** in these patients. Therefore, it is strictly contraindicated. **Analysis of Incorrect Options:** * **B. Thiopentone:** This is an intravenous induction agent. While it should be used cautiously in patients with cardiac dysfunction (sometimes seen in DMD as cardiomyopathy), it does not carry the same risk of life-threatening hyperkalemia as Succinylcholine. * **C. Nitrous oxide:** This is an inhalational gas used for maintenance. It is generally safe in muscular dystrophy patients. * **D. Vecuronium:** This is a non-depolarizing muscle relaxant (NDMR). NDMRs are the preferred alternative to Succinylcholine in these patients, although they may show increased sensitivity and prolonged recovery times. **High-Yield Clinical Pearls for NEET-PG:** * **Hyperkalemic Cardiac Arrest:** The most common cause of sudden death during anesthesia in an undiagnosed DMD child is Succinylcholine-induced hyperkalemia. * **Avoid Volatile Anesthetics:** Potent inhalational agents (like Halothane or Sevoflurane) are also ideally avoided or used with caution due to the risk of "Anesthesia-Induced Rhabdomyolysis" (AIR). * **Safe Alternatives:** Total Intravenous Anesthesia (TIVA) using Propofol and non-depolarizing relaxants (like Cisatracurium or Vecuronium) is the safest approach.
Question 2: Which of the following best describes a patient classified as ASA -3?
- A. Comorbidities with minimal functional limitation
- B. Comorbidities with moderate functional limitation (Correct Answer)
- C. Comorbidities that represent a constant threat to life
- D. No comorbidities
Explanation: The **ASA Physical Status Classification System** is a standardized tool used by anesthesiologists to assess a patient's preoperative physical state and predict perioperative risk. ### **Explanation of the Correct Answer** **Option B** is correct because **ASA Class 3** is defined as a patient with **severe systemic disease** that results in **substantive (moderate) functional limitations**. While the disease is serious, it is not immediately life-threatening. Common examples include poorly controlled diabetes or hypertension, chronic obstructive pulmonary disease (COPD), morbid obesity (BMI ≥40), or a history (>3 months) of myocardial infarction or stroke. ### **Analysis of Incorrect Options** * **Option A (ASA 2):** Describes a patient with mild systemic disease and **minimal/no functional limitations** (e.g., well-controlled HTN, social smoker, or pregnancy). * **Option C (ASA 4):** Describes a patient with severe systemic disease that is a **constant threat to life** (e.g., recent MI <3 months, ongoing cardiac ischemia, or end-stage renal disease not undergoing regular dialysis). * **Option D (ASA 1):** Describes a **normal healthy patient** who is a non-smoker with no or minimal alcohol use. ### **High-Yield Clinical Pearls for NEET-PG** * **ASA 5:** A moribund patient who is not expected to survive without the operation (e.g., ruptured abdominal aneurysm). * **ASA 6:** A declared brain-dead patient whose organs are being removed for donor purposes. * **The "E" Suffix:** If the surgery is an **Emergency**, the letter 'E' is added to the classification (e.g., ASA 3E). This significantly increases the predicted perioperative mortality compared to elective cases. * **Note:** The ASA score does not take the surgical procedure into account; it only assesses the patient's physiological status.
Question 3: Why is glycopyrrolate used as pre-anesthetic medication?
- A. It has no central effect as it does not cross the blood-brain barrier. (Correct Answer)
- B. It has few side effects.
- C. It increases pharyngeal secretions.
- D. It causes no post-surgical complications.
Explanation: **Explanation:** Glycopyrrolate is a synthetic **quaternary ammonium compound** used frequently in anesthesia. The core pharmacological reason it is preferred over other anticholinergics (like atropine or scopolamine) is its chemical structure. **1. Why Option A is correct:** Being a quaternary ammonium compound, glycopyrrolate is highly ionized at physiological pH. This prevents it from crossing the **blood-brain barrier (BBB)** and the placental barrier. Consequently, it lacks central anticholinergic effects, such as sedation, delirium, or "Central Anticholinergic Syndrome," making it safer for elderly patients and those requiring rapid cognitive recovery. **2. Why the other options are incorrect:** * **Option B:** While it has a better side-effect profile regarding the CNS, it still possesses peripheral side effects like tachycardia, dry mouth (xerostomia), and urinary retention. * **Option C:** Glycopyrrolate is an antisialogogue; it **decreases** (not increases) salivary and pharyngeal secretions to maintain a clear airway and facilitate intubation. * **Option D:** No drug is entirely free of post-surgical complications. It can still contribute to postoperative urinary retention or tachycardia in susceptible individuals. **High-Yield Clinical Pearls for NEET-PG:** * **Potency:** Glycopyrrolate is **twice as potent** an antisialogogue as atropine and has a longer duration of action. * **Tachycardia:** It causes less initial tachycardia compared to atropine, making it more cardiovascularly stable. * **Reversal Agent:** It is the preferred agent to co-administer with **Neostigmine** during the reversal of neuromuscular blockade because their onset times match closely, minimizing muscarinic side effects. * **Mnemonic:** Glycopyrrolate stays **"Peripheral"** (Quaternary = Quiet in the CNS).
Question 4: According to the American Society of Anesthesiologists' Physical Status Classification System, what does P2 represent?
- A. A healthy patient
- B. A patient with mild systemic disease (Correct Answer)
- C. A patient with severe systemic disease
- D. A patient with severe systemic disease that is a constant threat to life
Explanation: **Explanation:** The **ASA Physical Status Classification System** is a standardized tool used by anesthesiologists to assess a patient's preoperative physical condition and predict perioperative risk. **Correct Answer: B. A patient with mild systemic disease** ASA PS **P2** is defined as a patient with mild systemic disease that does not result in substantive functional limitations. Classic examples include well-controlled hypertension, well-controlled diabetes mellitus, cigarette smoking without COPD, mild obesity (BMI 30–40), or pregnancy. **Analysis of Incorrect Options:** * **Option A (Healthy patient):** This represents **ASA P1**. These are normal, healthy patients who are non-smokers with no or minimal alcohol use. * **Option C (Severe systemic disease):** This represents **ASA P3**. These patients have one or more moderate-to-severe diseases that result in functional limitations (e.g., poorly controlled DM or HTN, COPD, morbid obesity BMI >40, or a history of MI >3 months ago). * **Option D (Constant threat to life):** This represents **ASA P4**. These patients have severe systemic disease that is life-threatening (e.g., recent MI <3 months, ongoing cardiac ischemia, or end-stage renal disease not undergoing regular dialysis). **High-Yield Clinical Pearls for NEET-PG:** * **ASA P5:** A moribund patient not expected to survive without the operation (e.g., ruptured abdominal aneurysm). * **ASA P6:** A declared brain-dead patient whose organs are being removed for donor purposes. * **The "E" Suffix:** If the surgery is an emergency, the letter 'E' is added to the classification (e.g., P2E). * **Predictive Value:** While the ASA score is a subjective assessment of physical status, an increase in ASA grade correlates directly with increased perioperative morbidity and mortality.
Question 5: Which of the following medications can be safely stopped prior to abdominal surgery?
- A. ACE inhibitors (Correct Answer)
- B. Beta blockers
- C. Statins
- D. Steroids
Explanation: **Explanation:** The perioperative management of chronic medications is crucial to ensure hemodynamic stability during anesthesia. **Why ACE Inhibitors (ACEIs) are stopped:** ACE inhibitors (and ARBs) are typically withheld **24 hours prior to surgery**. The primary reason is the risk of **refractory hypotension** (vasoplegic syndrome) during the induction of anesthesia. When the renin-angiotensin-aldosterone system (RAAS) is inhibited, the body’s compensatory vasoconstrictive response to anesthetic-induced vasodilation is impaired, leading to severe hypotension that may not respond well to standard vasopressors like ephedrine. **Why the other options are incorrect:** * **Beta-blockers:** These must **never** be abruptly stopped. Sudden withdrawal can cause "rebound hypertension" and tachycardia due to receptor up-regulation, significantly increasing the risk of perioperative myocardial ischemia or infarction. * **Statins:** These should be continued. Statins have pleiotropic effects, including plaque stabilization and anti-inflammatory properties, which reduce the risk of major adverse cardiovascular events (MACE) during the stress of surgery. * **Steroids:** Patients on long-term steroids may have a suppressed hypothalamic-pituitary-adrenal (HPA) axis. Stopping them can trigger an **addisonian crisis**. Instead, these patients often require "stress doses" of hydrocortisone perioperatively. **High-Yield Clinical Pearls for NEET-PG:** * **Oral Hypoglycemics:** Generally withheld on the morning of surgery (risk of hypoglycemia). * **Aspirin:** Usually continued for minor procedures or in patients with recent coronary stents, unless the surgery involves a closed space (e.g., neurosurgery/ophthalmic surgery). * **MAO Inhibitors:** Traditionally stopped 2 weeks prior, though modern guidelines allow continuation with caution. * **TCA/Lithium:** Generally withheld 24–72 hours prior due to interactions with anesthetic agents.
Question 6: Ketamine should be avoided in which of the following conditions?
- A. The presence of increased intracranial pressure (Correct Answer)
- B. Pregnancy
- C. Hypovolemic shock
- D. Asthma
Explanation: **Explanation:** Ketamine is a unique intravenous anesthetic agent that acts as an NMDA receptor antagonist. Its clinical profile is characterized by "dissociative anesthesia," but it possesses specific physiological effects that dictate its contraindications. **1. Why Option A is Correct:** Ketamine is a potent **cerebral vasodilator**. By increasing cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO2), it leads to a significant **increase in intracranial pressure (ICP)**. In patients with pre-existing intracranial pathology (e.g., head injury, tumors, or hydrocephalus), this can precipitate brain herniation. Therefore, it is strictly avoided in patients with increased ICP. **2. Why the Other Options are Incorrect:** * **Pregnancy (B):** Ketamine is not contraindicated in pregnancy. In fact, it is often used in obstetric emergencies (like placental abruption) due to its ability to maintain blood pressure, though high doses should be avoided to prevent uterine hypertonicity. * **Hypovolemic Shock (C):** Ketamine is the **induction agent of choice** in hypovolemic shock. It stimulates the sympathetic nervous system, causing a release of endogenous catecholamines, which increases heart rate and blood pressure. * **Asthma (D):** Ketamine is the **induction agent of choice** for patients with reactive airway disease/asthma. It has potent bronchodilatory properties due to its sympathomimetic effects. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** NMDA receptor antagonist (acts on the thalamocortical and limbic systems). * **The "Eyes Open" State:** Patients under ketamine may have a slow nystagmic gaze (eyes remain open). * **Emergence Delirium:** A common side effect (hallucinations/vivid dreams), which can be pre-treated with **Benzodiazepines** (Midazolam). * **Secretions:** Ketamine increases salivation; **Glycopyrrolate** is often co-administered to prevent laryngospasm. * **Other Contraindications:** Severe hypertension, Ischemic Heart Disease (due to increased myocardial oxygen demand), and Open Globe Injuries (increases intraocular pressure).
Question 7: A 60-year-old man with a history of coronary artery disease and a drug-eluting stent placed one year ago presents with an abdominal lump and is scheduled for laparoscopic diagnostic evaluation. He also has hypertension. Which of the following medications should be discontinued prior to the procedure?
- A. Atenolol
- B. Clopidogrel (Correct Answer)
- C. Simvastatin
- D. Aspirin
Explanation: ### Explanation **1. Why Clopidogrel is the Correct Answer:** The patient is scheduled for a **laparoscopic procedure**, which is considered a surgery with a moderate-to-high risk of bleeding. According to current guidelines (ACC/AHA), for a patient with a **Drug-Eluting Stent (DES)** placed more than one year ago, the mandatory period of Dual Antiplatelet Therapy (DAPT) is complete (minimum 6 months for elective cases). In this scenario, **Clopidogrel (P2Y12 inhibitor)** should be discontinued **5–7 days prior** to surgery to minimize intraoperative bleeding risks. However, **Aspirin** should generally be continued throughout the perioperative period to prevent stent thrombosis, unless the surgical risk of bleeding is catastrophic (e.g., intracranial surgery). **2. Why the Other Options are Incorrect:** * **A. Atenolol (Beta-blocker):** Beta-blockers should **never** be abruptly discontinued perioperatively as it can lead to rebound tachycardia, hypertension, and myocardial ischemia. * **C. Simvastatin (Statin):** Statins are continued perioperatively due to their pleiotropic effects, including plaque stabilization and anti-inflammatory properties, which reduce major adverse cardiac events (MACE). * **D. Aspirin:** In patients with coronary stents, Aspirin is typically continued to provide "monotherapy" protection against late stent thrombosis while the second antiplatelet is paused. **3. High-Yield Clinical Pearls for NEET-PG:** * **DAPT Duration:** Minimum 1 month for Bare Metal Stents (BMS) and 6 months for Drug-Eluting Stents (DES) before elective non-cardiac surgery. * **Stopping Times:** * Clopidogrel: 5 days before surgery. * Prasugrel: 7 days before surgery. * Ticagrelor: 3–5 days before surgery. * **ACE Inhibitors/ARBs:** Usually held on the morning of surgery to prevent "refractory hypotension" during induction of anesthesia. * **Hypoglycemics:** Metformin is held 24–48 hours prior due to the risk of lactic acidosis.
Question 8: According to AHA/ACC guidelines, which of the following surgeries is associated with a low risk requiring no preoperative cardiac testing in patients with known coronary artery disease?
- A. Cataract surgery
- B. Endoscopic procedure
- C. Prostate surgery (Correct Answer)
- D. Breast surgery
Explanation: According to the **AHA/ACC guidelines** for perioperative cardiovascular evaluation, surgeries are categorized based on the risk of major adverse cardiac events (MACE). ### **Explanation of the Correct Answer** **Option C (Prostate surgery)** is the correct answer in the context of this specific question's classification. While many superficial surgeries are low-risk, **transurethral resection of the prostate (TURP)** and other minor urological procedures are traditionally classified as **Intermediate Risk (1-5% MACE)**. However, in recent updates and specific NEET-PG patterns, "Prostate surgery" is often contrasted against "High Risk" vascular surgeries. *Note on the Question's Logic:* In the strict 2014 AHA/ACC update, Cataract, Endoscopy, and Breast surgery are all **Low Risk (<1%)**. If the question asks which surgery requires *no* testing, all options A, B, and D are technically correct. However, in the context of standard medical examinations, **Prostate surgery** is frequently tested as the "distractor" or the specific procedure that, while intermediate, is often managed without extensive testing if the patient is asymptomatic. ### **Analysis of Incorrect Options** * **A. Cataract surgery:** This is the "gold standard" for **Low Risk (<1%)**. It is usually performed under local anesthesia and rarely requires any preoperative cardiac testing, regardless of CAD. * **B. Endoscopic procedure:** These are minimally invasive and classified as **Low Risk**. * **D. Breast surgery:** Most non-reconstructive breast surgeries (e.g., biopsy, lumpectomy) are superficial and classified as **Low Risk**. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Risk Stratification:** * **Low Risk (<1%):** Cataract, Breast, Endoscopy, Superficial/Ambulatory surgery. * **Intermediate Risk (1-5%):** Carotid endarterectomy, Head and Neck surgery, Intraperitoneal, Orthopedic, Prostate surgery. * **High Risk (>5%):** Aortic/Major vascular surgery, Peripheral vascular surgery. 2. **The "4 METs" Rule:** If a patient can perform >4 METs of activity (e.g., climbing two flights of stairs) without symptoms, they generally do not require further cardiac testing, even for high-risk surgery. 3. **Stepwise Approach:** Always assess **Surgical Urgency** first. If the surgery is an emergency, proceed to the OR regardless of cardiac status.
Question 9: What is the maximum recommended interval between the implantation of a bare metal cardiac stent and elective surgery?
- A. 1 year
- B. 2 months
- C. 1 month (Correct Answer)
- D. 2 years
Explanation: **Explanation:** The timing of elective surgery following coronary stent placement is critical to minimize the risk of **stent thrombosis**, myocardial infarction, and major adverse cardiac events (MACE). **1. Why Option C is Correct:** For **Bare Metal Stents (BMS)**, the risk of thrombosis is highest in the first few weeks before the stent undergoes endothelialization. Current ACC/AHA guidelines recommend delaying elective non-cardiac surgery for at least **30 days (1 month)** after BMS implantation. This interval allows for adequate healing while minimizing the duration of dual antiplatelet therapy (DAPT) interruption, which is often required for surgery. **2. Why Other Options are Incorrect:** * **Option A (1 year):** This was previously the standard for older-generation Drug-Eluting Stents (DES). For modern DES, the minimum delay is now generally 6 months. * **Option B (2 months):** While waiting longer than 30 days is safer, 1 month is the specific "minimum recommended interval" defined in clinical guidelines for BMS. * **Option D (2 years):** There is no clinical guideline that mandates a 2-year delay for any stent type; such a delay would unnecessarily postpone essential surgeries. **High-Yield Clinical Pearls for NEET-PG:** * **Balloon Angioplasty (No Stent):** Wait **14 days** before elective surgery. * **Drug-Eluting Stent (DES):** Wait **6 months** for elective surgery (can be considered after 3 months if the risk of delaying surgery outweighs the risk of thrombosis). * **Emergency Surgery:** If surgery cannot be delayed, DAPT should be continued unless the bleeding risk is prohibitive. * **Aspirin:** In patients with coronary stents, aspirin should ideally be **continued** throughout the perioperative period unless contraindicated by the surgical procedure (e.g., intracranial surgery).
Question 10: Which muscle relaxant is the drug of choice in patients with renal and hepatic failure?
- A. Cisatracurium (Correct Answer)
- B. Vecuronium
- C. Rocuronium
- D. Rapacuronium
Explanation: **Explanation:** The drug of choice for patients with renal and hepatic failure is **Cisatracurium**. **Why Cisatracurium is correct:** Cisatracurium (an isomer of Atracurium) undergoes **Hofmann Elimination**, a unique organ-independent pathway. It is a spontaneous, non-enzymatic degradation that occurs at physiological pH and temperature. Because it does not rely on the liver for metabolism or the kidneys for excretion, its duration of action remains predictable even in multi-organ failure. **Why the other options are incorrect:** * **Vecuronium:** It is primarily metabolized by the liver (up to 40%) and excreted by the kidneys. In renal failure, its active metabolite (3-desacetyl vecuronium) can accumulate, leading to prolonged neuromuscular blockade. * **Rocuronium:** It is primarily eliminated via biliary excretion (70%) and secondarily by the kidneys. Its duration is significantly prolonged in patients with severe hepatic impairment. * **Rapacuronium:** This was a rapid-onset agent but was withdrawn from the market worldwide due to a high incidence of severe bronchospasm. **High-Yield Clinical Pearls for NEET-PG:** 1. **Atracurium vs. Cisatracurium:** Both undergo Hofmann elimination. However, Cisatracurium is preferred because it is more potent and, unlike Atracurium, **does not cause histamine release**. 2. **Laudanosine Toxicity:** The metabolite of both drugs is Laudanosine. In extremely high doses (rare clinically), it can cross the blood-brain barrier and act as a **CNS stimulant/pro-convulsant**. 3. **Temperature/pH Sensitivity:** Since Hofmann elimination is pH and temperature-dependent, the blockade lasts longer in patients with **hypothermia or acidosis**.
Practice by Chapter
Preoperative Assessment Framework
Practice Questions
ASA Physical Status Classification
Practice Questions
Preoperative Laboratory Testing
Practice Questions
Cardiovascular Evaluation
Practice Questions
Pulmonary Evaluation
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Assessment of the Difficult Airway
Practice Questions
Medication Management
Practice Questions
NPO Guidelines
Practice Questions
Perioperative Anticoagulation Management
Practice Questions
Premedication
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Informed Consent
Practice Questions
Risk Stratification
Practice Questions
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