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?
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.
Practice by Chapter
Preoperative Assessment Framework
Practice Questions
ASA Physical Status Classification
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Preoperative Laboratory Testing
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Cardiovascular Evaluation
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Pulmonary Evaluation
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Assessment of the Difficult Airway
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Medication Management
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NPO Guidelines
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Perioperative Anticoagulation Management
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Premedication
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Informed Consent
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Risk Stratification
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