Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management Indian Medical PG Practice Questions and MCQs

Question 61: A 35-year-old woman with type 2 diabetes treated with metformin, anemia due to menorrhagia, and a BMI of 40, is scheduled for elective surgery for a large ovarian tumor. What ASA physical status classification would this patient be assigned?

A. ASA 1
B. ASA 2
C. ASA 3 (Correct Answer)
D. ASA 4

Explanation: ### **Explanation** The correct answer is **ASA 3**. The **ASA Physical Status Classification System** is a clinical tool used to assess a patient's preoperative physical state and predict perioperative risk. **Why ASA 3 is correct:** ASA 3 is defined as a patient with **severe systemic disease** that is not life-threatening but causes functional limitations. This patient has multiple significant comorbidities: 1. **Morbid Obesity:** A BMI of $\geq 40$ is automatically classified as ASA 3. 2. **Type 2 Diabetes:** While controlled DM is ASA 2, the presence of multiple systemic issues (obesity + anemia + DM) pushes the patient into a higher risk category. 3. **Symptomatic Anemia:** Anemia due to menorrhagia, especially if severe enough to require surgery, contributes to systemic physiological stress. **Why other options are incorrect:** * **ASA 1:** Reserved for a normal, healthy, non-smoking patient with minimal or no alcohol use. * **ASA 2:** A patient with mild systemic disease without substantive functional limitations (e.g., BMI 30–39, well-controlled DM/HTN, or a smoker). This patient’s BMI of 40 exceeds this category. * **ASA 4:** 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). --- ### **High-Yield Clinical Pearls for NEET-PG** * **BMI Thresholds:** BMI 30–39.9 is **ASA 2**; BMI $\geq 40$ is **ASA 3**. * **Pregnancy:** A healthy pregnant woman is always classified as **ASA 2**. * **The "E" Suffix:** If the surgery is an emergency, the letter 'E' is added to the classification (e.g., ASA 3E). * **ASA 5:** A moribund patient who is not expected to survive without the operation (e.g., ruptured abdominal aortic aneurysm). * **ASA 6:** A declared brain-dead patient whose organs are being removed for donor purposes.

Question 62: What is the minimum starvation time required before general anesthesia?

A. 4 hours
B. 8 hours (Correct Answer)
C. 12 hours
D. 24 hours

Explanation: **Explanation:** The primary goal of preoperative fasting (NPO status) is to minimize the volume and acidity of gastric contents, thereby reducing the risk of **pulmonary aspiration** of gastric contents—a life-threatening complication during the induction of general anesthesia. **Why 8 hours is the correct answer:** According to the standard ASA (American Society of Anesthesiologists) guidelines, a minimum of **8 hours** of fasting is mandatory for a **heavy meal** (defined as meals containing fried foods, fatty foods, or meat). Since the question asks for the general minimum starvation time without specifying the meal type, 8 hours is the conventional clinical standard taught for "full stomach" precautions to ensure complete gastric emptying. **Analysis of Incorrect Options:** * **A. 4 hours:** This is insufficient for solid food. While 4 hours is the fasting requirement for **breast milk**, it does not provide enough time for the digestion of solids or non-human milk. * **C. 12 hours:** While some surgeons traditionally requested "NPO after midnight," 12 hours is unnecessarily long for most patients and can lead to dehydration, hypoglycemia, and irritability without providing additional safety benefits over 8 hours. * **D. 24 hours:** This is clinically inappropriate and can lead to significant metabolic derangement and electrolyte imbalances. **High-Yield Clinical Pearls for NEET-PG (The 2-4-6-8 Rule):** * **2 Hours:** Clear liquids (water, fruit juice without pulp, carbonated beverages, black coffee/tea). * **4 Hours:** Breast milk. * **6 Hours:** Light meal (toast and clear liquids), infant formula, or non-human milk. * **8 Hours:** Heavy meal (fatty, fried, or meat products). * **Note:** Patients with delayed gastric emptying (e.g., Diabetes Mellitus, pregnancy, obesity, or intestinal obstruction) are always treated as "full stomach" regardless of fasting time.

Question 63: ASA classification is done for what purpose?

A. Fasting status
B. Patient's preoperative risk (Correct Answer)
C. Pain assessment
D. Lung capacity evaluation

Explanation: ### Explanation The **ASA (American Society of Anesthesiologists) Physical Status Classification System** is a globally standardized tool used to assess a patient's **preoperative physical status and overall medical fitness**. Its primary purpose is to categorize the severity of a patient’s underlying systemic disease, which directly correlates with **perioperative risk and mortality**. * **Why Option B is Correct:** The ASA score (ranging from I to VI) provides a snapshot of the patient's physiological reserve. A higher ASA grade indicates more severe systemic disease and a statistically higher risk of postoperative complications and death. * **Why Options A, C, and D are Incorrect:** * **Fasting status (A):** This is guided by "NPO guidelines" (e.g., 2-4-6-8 rule) to prevent aspiration, not the ASA score. * **Pain assessment (C):** Pain is evaluated using scales like the Visual Analogue Scale (VAS) or Numerical Rating Scale (NRS). * **Lung capacity (D):** This is assessed via Pulmonary Function Tests (PFTs) and bedside tests like the breath-holding test (Sabrazes test). ### High-Yield NEET-PG Pearls: 1. **ASA I:** Normal healthy patient. 2. **ASA II:** Mild systemic disease (e.g., controlled HTN, DM, BMI 30-40). 3. **ASA III:** Severe systemic disease that **limits activity** (e.g., stable angina, BMI >40). 4. **ASA IV:** Severe systemic disease that is a **constant threat to life** (e.g., recent MI <3 months, unstable angina). 5. **ASA V:** Moribund patient not expected to survive without the operation. 6. **ASA VI:** Declared brain-dead patient (organ donor). 7. **Suffix 'E':** Added for **Emergency** surgeries (e.g., ASA IIE), which significantly increases the risk compared to elective cases.

Question 64: A female patient is posted for breast lumpectomy and is taking herbal medicines. What advice should be given regarding pre-operative orders?

A. Defer surgery
B. Advise to stop herbal medication 2 weeks prior to surgery (Correct Answer)
C. Continue the herbal medicine till the day of surgery
D. No specific advice regarding herbal medication is needed

Explanation: **Explanation:** The correct management for patients taking herbal supplements prior to elective surgery is to **discontinue them at least 2 weeks before the procedure**. This recommendation, supported by the American Society of Anesthesiologists (ASA), is based on the potential for herbal medicines to interfere with anesthesia and surgical outcomes. **Why Option B is Correct:** Herbal medications are not regulated as strictly as pharmaceuticals and can have significant perioperative side effects, including: * **Coagulopathy:** Supplements like Garlic, Ginger, Ginkgo biloba, and Ginseng (the "4 Gs") increase bleeding risk. * **Cardiovascular Instability:** Ephedra can cause tachycardia and hypertension, while Ginseng may cause hypoglycemia. * **Prolonged Sedation:** Valerian and St. John’s Wort can potentiate the effects of anesthetic agents or induce cytochrome P450 enzymes, altering drug metabolism. A 2-week window allows for the clearance of these substances and the reversal of their physiological effects. **Why Other Options are Incorrect:** * **Option A:** Deferring surgery indefinitely is unnecessary if the patient can safely stop the supplement for the required duration. * **Option C & D:** Continuing these medications or ignoring them poses significant risks, such as intraoperative hemorrhage, delayed emergence from anesthesia, or unpredictable drug interactions. **High-Yield Clinical Pearls for NEET-PG:** * **St. John’s Wort:** Potent inducer of CYP3A4; reduces the efficacy of drugs like cyclosporine and warfarin. * **Ginkgo Biloba:** Potent inhibitor of platelet-activating factor (PAF); must be stopped to prevent surgical site hematomas. * **Ephedra (Ma Huang):** Should be stopped 24 hours prior due to risk of intraoperative arrhythmias. * **Garlic:** Irreversibly inhibits platelet aggregation; effects last 7–10 days.

Question 65: Preanesthetic medication comprises of all the following, except:

A. Diazepam
B. Atropine
C. Metoclopramide
D. Lignocaine (Correct Answer)

Explanation: **Explanation:** Preanesthetic medication refers to the administration of drugs before the induction of anesthesia to reduce anxiety, provide sedation, prevent autonomic reflex responses, and minimize the risk of aspiration. **Why Lignocaine is the Correct Answer:** Lignocaine is a local anesthetic and Class Ib anti-arrhythmic agent. While it is used intraoperatively (e.g., to blunt the pressor response during intubation or as part of a multimodal analgesic infusion), it is **not** classified as a standard preanesthetic medication. Its primary role is procedural or therapeutic rather than preparatory. **Analysis of Other Options:** * **Diazepam:** A benzodiazepine used as a sedative-hypnotic to provide anxiolysis and anterograde amnesia. It is a classic premedicant. * **Atropine:** An anticholinergic (antimuscarinic) agent used to reduce salivary and bronchial secretions and to prevent vagally-mediated bradycardia during surgery. * **Metoclopramide:** A prokinetic and antiemetic agent. It is used in premedication to increase lower esophageal sphincter tone and promote gastric emptying, reducing the risk of aspiration pneumonitis (Mendelson’s Syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Mendelson’s Syndrome:** Aspiration pneumonitis characterized by a gastric volume >25 ml and pH <2.5. Premedication with Metoclopramide and H2 blockers (Ranitidine) helps mitigate this. * **Glycopyrrolate vs. Atropine:** Glycopyrrolate is often preferred over Atropine as a premedicant because it does not cross the blood-brain barrier (quaternary ammonium), causing less tachycardia and no central anticholinergic syndrome. * **Midazolam:** Currently the most common benzodiazepine used for premedication due to its rapid onset and shorter duration compared to Diazepam.

Question 66: A 40-year-old patient with liver dysfunction is scheduled for a surgical procedure. Lorazepam can be used for pre-anaesthetic medication in this patient without concern for excessive CNS depression because the drug is:

A. Selective anxiolytic like buspirone
B. Conjugated directly (Correct Answer)
C. Reversible by administration of naloxone
D. Forming several active metabolites

Explanation: **Explanation:** The correct answer is **B. Conjugated directly**. **Medical Concept:** Most benzodiazepines (like Diazepam and Midazolam) undergo **Phase I metabolism** (oxidation/reduction) via the Cytochrome P450 system in the liver before undergoing Phase II conjugation. In patients with liver dysfunction, Phase I reactions are significantly impaired, leading to the accumulation of active metabolites and prolonged CNS depression. **Lorazepam**, along with **Oxazepam** and **Temazepam** (remembered by the mnemonic **LOT**), bypasses Phase I metabolism. These drugs undergo direct **Phase II metabolism** (Glucuronidation) to form inactive, water-soluble metabolites that are excreted by the kidneys. Since Phase II metabolism is relatively preserved even in advanced liver disease, Lorazepam is the preferred benzodiazepine for patients with hepatic impairment. **Analysis of Incorrect Options:** * **A. Selective anxiolytic like buspirone:** Buspirone is a serotonin (5-HT1A) receptor agonist used for chronic anxiety; it is not used for pre-anaesthetic medication as it lacks immediate sedative effects. * **C. Reversible by naloxone:** Naloxone is a specific opioid antagonist. The specific antagonist for benzodiazepines is **Flumazenil**. * **D. Forming several active metabolites:** This is characteristic of drugs like Diazepam (which forms desmethyldiazepam). Active metabolites prolong the duration of action, which is exactly what we want to avoid in liver failure. **High-Yield NEET-PG Pearls:** * **LOT** (Lorazepam, Oxazepam, Temazepam) are safe in liver failure and in the elderly. * **Midazolam** is the most common pre-anaesthetic medication due to its rapid onset and potent anterograde amnesia, but it requires cautious dosing in hepatic failure. * **Phase II reactions** (Glucuronidation, Acetylation, Sulfonation) are generally "sturdier" and less affected by age or liver disease than Phase I reactions.

Question 67: Lactated Ringer's solution (Hartmann's solution) contains all of the following electrolytes in approximately the same proportion as human extracellular fluid EXCEPT?

A. Bicarbonate (Correct Answer)
B. Chloride
C. Potassium
D. Sodium

Explanation: **Explanation:** Lactated Ringer’s (LR) is a balanced salt solution designed to mimic the electrolyte composition of human extracellular fluid (ECF). However, it differs significantly in its buffer system. **Why Bicarbonate is the correct answer:** LR does **not** contain bicarbonate. Instead, it contains **Sodium Lactate** (28 mEq/L). Bicarbonate is unstable in plastic bags and can cause calcium precipitation. Once infused, the liver metabolizes lactate into bicarbonate, providing a buffering effect. Therefore, while LR is "physiologically balanced," it does not contain bicarbonate in its pre-infused state. **Analysis of Incorrect Options:** * **Sodium (130 mEq/L):** This is close to the ECF concentration (135–145 mEq/L). While slightly hyponatremic, it is the primary cation in both. * **Potassium (4 mEq/L):** This is nearly identical to the normal ECF range (3.5–5.0 mEq/L), making LR safer than Normal Saline for maintaining potassium balance. * **Chloride (109 mEq/L):** This is very close to the ECF range (98–107 mEq/L). In contrast, 0.9% Normal Saline has 154 mEq/L of Chloride, which can lead to hyperchloremic metabolic acidosis. **High-Yield Clinical Pearls for NEET-PG:** 1. **Composition of LR:** Na⁺ (130), Cl⁻ (109), K⁺ (4), Ca²⁺ (3), and Lactate (28). 2. **Osmolarity:** LR is slightly hypotonic (273 mOsm/L) compared to plasma (285–295 mOsm/L). 3. **Contraindication:** LR should not be used as a diluent for **blood transfusions** because the Calcium in LR can bind to the Citrate anticoagulant in blood bags, leading to clot formation. 4. **Metabolic Effect:** Large volumes of LR can lead to **iatrogenic metabolic alkalosis** due to the conversion of lactate to bicarbonate.

Question 68: A brain-dead patient falls under which category in the ASA classification?

A. ASA I
B. ASA 3
C. ASA 4
D. ASA 6 (Correct Answer)

Explanation: **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. **Why ASA 6 is correct:** The ASA 6 category was specifically added to the classification system to identify **declared brain-dead patients** whose organs are being removed for donor purposes. These patients are maintained on life support (ventilatory and hemodynamic) solely to ensure organ viability until the procurement surgery is completed. **Analysis of Incorrect Options:** * **ASA 1:** Refers to a normal, healthy, non-smoking patient with no systemic disease and minimal alcohol use. * **ASA 3:** Refers to a patient with **severe systemic disease** that results in functional limitations (e.g., poorly controlled DM or HTN, stable angina, or a history of MI >3 months ago). * **ASA 4:** Refers to a patient with severe systemic disease that is a **constant threat to life** (e.g., recent MI <3 months ago, ongoing cardiac ischemia, or end-stage renal disease not undergoing regular dialysis). **High-Yield Clinical Pearls for NEET-PG:** * **The "E" Suffix:** If a surgery is an emergency, the letter "E" is added to the classification (e.g., ASA 2E). * **ASA 2:** Includes mild systemic disease without substantive functional limitations (e.g., social smoker, pregnancy, well-controlled DM/HTN). * **ASA 5:** A moribund patient who is not expected to survive without the operation (e.g., ruptured abdominal aortic aneurysm, massive trauma). * **Note:** The ASA grade is an assessment of physical status, not a predictor of anesthetic risk by itself, though the two are highly correlated.

Question 69: What is the role of the Mallampati classification in preanesthetic evaluation?

A. To identify difficulty in ventilation
B. To identify difficulty in intubation (Correct Answer)
C. To identify difficulty in both ventilation and intubation
D. To identify cardiac risk with surgery

Explanation: The **Mallampati Classification** is a bedside clinical tool used to predict the ease of endotracheal intubation by assessing the relationship between the size of the tongue and the oral cavity. ### **Explanation of the Correct Answer** **Option B** is correct because the Mallampati score correlates the visibility of oropharyngeal structures (soft palate, uvula, faucial pillars) with the **Cormack-Lehane grade** seen during direct laryngoscopy. A large tongue relative to the oral cavity (Class III or IV) obscures the view of the glottis, directly indicating a **difficult intubation**. ### **Analysis of Incorrect Options** * **Option A & C:** While Mallampati is a component of airway assessment, it specifically predicts intubation difficulty. Difficulty in **ventilation** (Bag-Mask Ventilation) is better predicted by the **BONES** mnemonic (Beard, Obesity, No teeth, Elderly, Snoring). * **Option D:** Cardiac risk is assessed using the **Revised Cardiac Risk Index (RCRI)** or **ASA Physical Status Classification**, not airway exams. ### **High-Yield Clinical Pearls for NEET-PG** * **Method:** Performed with the patient sitting upright, head in neutral position, mouth wide open, and **tongue protruded without phonation** (saying "Ah" can falsely improve the grade). * **The Classes:** * **Class I:** Soft palate, fauces, uvula, pillars visible. * **Class II:** Soft palate, fauces, portion of uvula visible. * **Class III:** Soft palate and base of uvula visible. * **Class IV:** Only hard palate visible (Highest risk of difficult intubation). * **Samsoon and Young’s Modification:** Added Class IV to the original three-class system. * **Mnemonic for Airway Assessment:** **LEMON** (Look externally, Evaluate 3-3-2 rule, Mallampati, Obstruction, Neck mobility).

Question 70: Which of the following drugs should be discontinued on the day of surgery?

A. Atenolol
B. Amlodipine
C. Metformin (Correct Answer)
D. Statin

Explanation: **Explanation:** The correct answer is **Metformin**. The primary concern with continuing Metformin on the day of surgery is the risk of **lactic acidosis**, especially in the context of perioperative dehydration, hypotension, or the use of IV contrast, which can impair renal function. Most guidelines recommend withholding Metformin **24 to 48 hours** before major surgery. **Why the other options are incorrect:** * **Atenolol (Beta-blockers):** These must be **continued** on the day of surgery. Abrupt withdrawal can lead to rebound tachycardia, hypertension, and increased myocardial oxygen demand, potentially triggering a perioperative MI. * **Amlodipine (Calcium Channel Blockers):** These are generally **continued** to maintain hemodynamic stability and blood pressure control throughout the procedure. * **Statins:** These are **continued** due to their pleiotropic effects, which include stabilizing atherosclerotic plaques and reducing the risk of perioperative cardiovascular events. **High-Yield Clinical Pearls for NEET-PG:** 1. **ACE Inhibitors/ARBs:** Usually **held** on the day of surgery to prevent "refractory hypotension" during induction of anesthesia. 2. **Oral Hypoglycemic Agents (OHAs):** Generally held on the morning of surgery (NPO status). SGLT-2 inhibitors (e.g., Empagliflozin) should be stopped **3–4 days** prior due to the risk of euglycemic ketoacidosis. 3. **Insulin:** Long-acting insulin doses are typically reduced (e.g., 50-80% of the dose), but never completely stopped in Type 1 Diabetics. 4. **Steroids:** Should be **continued**; patients on chronic steroids may require "stress doses" of Hydrocortisone to prevent adrenal crisis.

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

Practice Questions

Assessment of the Difficult Airway

Practice Questions

Medication Management

Practice Questions

NPO Guidelines

Practice Questions

Perioperative Anticoagulation Management

Practice Questions

Premedication

Practice Questions

Informed Consent

Practice Questions

Risk Stratification

Practice Questions

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