Preoperative Evaluation and Management Practice Questions

Q: According to current guidelines, how many hours before surgery should solids per oral be stopped?

6 hours. **Explanation:** The correct answer is **6 hours**. The primary goal of preoperative fasting (NPO status) is to reduce the volume and acidity of gastric contents, thereby minimizing the risk of **pulmonary aspiration of gastric contents**, a potentially fatal complication known as Mendelson’s Syndrome. **Why 6 hours is correct:** Current guidelines (ASA and ISA) recommend a minimum fasting period of **6 hours** for a "light meal" (e.g., toast and clear liquids) and for non-human milk or infant formula. This duration allows sufficient time for gastric emptying in healthy individuals. However, if the meal includes fatty or fried foods, the duration is typically extended to 8 hours. **Analysis of Incorrect Options:** * **A. 4 hours:** This is the recommended fasting time specifically for **breast milk** in infants, as it empties faster than solids or formula. It is insufficient for solid food. * **C. 8 hours:** While often practiced ("NPO after midnight"), 8 hours is specifically reserved for **heavy, fatty, or fried meals**. For a standard light solid meal, 6 hours is the guideline-defined minimum. * **D. 10 hours:** This is unnecessarily long and can lead to dehydration, hypoglycemia, and patient discomfort without providing additional safety benefits. **High-Yield Clinical Pearls for NEET-PG:** * **Clear Liquids:** Can be taken up to **2 hours** before surgery (e.g., water, fruit juices without pulp, carbonated beverages, black coffee). * **The "2-4-6-8 Rule":** * 2 hours: Clear liquids. * 4 hours: Breast milk. * 6 hours: Light meal/Infant formula/Non-human milk. * 8 hours: Fatty or fried foods. * **Exceptions:** Patients with delayed gastric emptying (Diabetes, pregnancy, obesity, or GERD) are often treated as "full stomachs" regardless of fasting time.

Q: A 65-year-old man with a history of severe COPD (chronic smoker), diabetes mellitus (on insulin and metformin), and hypertension (on antihypertensive medications), not on regular follow-up, is scheduled for emergency laparoscopic appendectomy. He experiences dyspnea on walking more than a few meters. According to the ASA physical status classification system, to which class would this patient be assigned?

ASA Class 4E. ### Explanation The **ASA Physical Status Classification System** is a clinical tool used to assess a patient's preoperative physical state and predict perioperative risk. **1. Why ASA Class 4E is correct:** * **ASA Class 4** is defined as a patient with a **severe systemic disease that is a constant threat to life**. In this case, the patient has severe COPD and experiences dyspnea after walking only a few meters. This indicates a very poor functional capacity and a disease state that significantly limits activity and poses an ongoing threat to survival. * **The "E" Modifier:** The patient is scheduled for an **emergency** laparoscopic appendectomy. According to ASA guidelines, the suffix "E" must be added to the classification for any surgery performed where a delay would significantly increase the threat to life or body part. **2. Why other options are incorrect:** * **ASA Class 3/3E:** This class represents severe systemic disease that is **not** a constant threat to life (e.g., stable COPD, controlled DM). This patient’s severe dyspnea at minimal exertion elevates him to Class 4. * **ASA Class 4 (without E):** While the physical status is correct, the classification is incomplete because it fails to account for the emergency nature of the surgery. **3. Clinical Pearls for NEET-PG:** * **ASA 1:** Healthy, non-smoking, no/minimal alcohol. * **ASA 2:** Mild systemic disease (e.g., smoker, well-controlled DM/HTN, obesity BMI 30-40). * **ASA 3:** Severe systemic disease, substantive functional limitations (e.g., stable angina, BMI >40, poorly controlled DM). * **ASA 5:** Moribund patient not expected to survive without the operation (e.g., ruptured AAA). * **ASA 6:** Declared brain-dead patient whose organs are being removed for donor purposes. * **High-Yield Tip:** Functional capacity (METs) is a key differentiator between ASA 3 and 4. Dyspnea at rest or minimal exertion usually points toward ASA 4.

Q: How many days before surgery should lithium be stopped?

3 days. **Explanation:** **Correct Option: C (3 days)** Lithium is a mood stabilizer used primarily for bipolar disorder. It is recommended to be discontinued **72 hours (3 days)** prior to major elective surgery. The primary medical rationale is its narrow therapeutic index and its significant interaction with neuromuscular blocking agents (NMBAs). Lithium inhibits the release of acetylcholine and interferes with post-synaptic ion channels, thereby **prolonging the duration of action** of both depolarizing (succinylcholine) and non-depolarizing muscle relaxants. Furthermore, lithium can decrease anesthetic requirements (MAC) and increase the risk of cardiac arrhythmias and renal dysfunction if dehydration occurs perioperatively. **Analysis of Incorrect Options:** * **A & B (1–2 days):** While some guidelines suggest 24–48 hours for minor procedures, for the purpose of standardized exams like NEET-PG, 72 hours is the established gold standard to ensure complete clearance and stabilization of electrolyte-like interactions at the neuromuscular junction. * **D (4 days):** Discontinuing lithium for too long increases the risk of a relapse into a manic or depressive episode. Three days is considered the optimal balance between pharmacological safety and psychiatric stability. **High-Yield Clinical Pearls for NEET-PG:** * **Interaction:** Lithium **prolongs** the block of both Succinylcholine and Vecuronium/Rocuronium. * **Toxicity:** NSAIDs, ACE inhibitors, and Thiazide diuretics can increase lithium levels, leading to toxicity (ataxia, tremors, seizures). * **Restarting:** Lithium should be restarted postoperatively only when oral intake is stable and renal function/electrolyte balance is confirmed. * **ECG Changes:** Chronic lithium use may cause T-wave flattening or inversion (similar to hypokalemia).

Q: Elective dental extractions on a patient who has had a myocardial infarct two months prior are best:

Postponed until at least six months have elapsed. **Explanation:** The primary concern in a post-myocardial infarction (MI) patient undergoing surgery is the risk of **Perioperative Reinfarction**. Statistics show that the risk of a recurrent MI is highest in the immediate post-infarct period and decreases over time. **1. Why Option D is correct:** Historically, the risk of reinfarction was approximately 30% if surgery was performed within 3 months of an MI, dropping to 15% between 3–6 months, and stabilizing at roughly 5–6% after **6 months**. While modern ACC/AHA guidelines suggest that elective surgery can be considered after 60 days (if no coronary intervention was done) or longer (if stents were placed), the "6-month rule" remains a classic, high-yield benchmark for NEET-PG questions regarding elective, non-urgent procedures like dental extractions to ensure maximum myocardial stability. **2. Why other options are incorrect:** * **Options A & B:** While oral sedation (Valium) can reduce anxiety-induced tachycardia and using epinephrine-free local anesthesia can prevent exogenous catecholamine-induced arrhythmias, these are **adjuncts** to safety. They do not mitigate the inherent physiological risk of reinfarction during the high-risk 0–6 month window. Safety is primarily time-dependent, not just technique-dependent. **Clinical Pearls for NEET-PG:** * **Highest Risk Period:** The risk of reinfarction is highest within the first 30 days post-MI. * **Gold Standard Timing:** For elective non-cardiac surgery, waiting **6 months** is the traditional teaching to reach the lowest baseline risk. * **Mortality:** Perioperative MI carries a high mortality rate (nearly 30–50%). * **Stent Considerations:** If a Bare Metal Stent (BMS) was placed, wait at least 30 days; for Drug-Eluting Stents (DES), wait at least 6 months (ideally 12) before elective surgery to avoid stent thrombosis.

Q: What is the ASA grading system used to assess?

Surgical patient risk factors. The **ASA Physical Status Classification System** is a standardized tool used by anesthesiologists to categorize a patient’s physiological status and overall health before surgery. ### **Why the Correct Answer is Right** The ASA grading system assesses **surgical patient risk factors** by evaluating the severity of a patient’s systemic diseases. It serves as a predictor of perioperative morbidity and mortality. While it does not predict specific anesthetic risks, it provides a baseline of the patient's "fitness" for surgery. ### **Why Other Options are Wrong** * **Cardiac Status (A) & Respiratory Status (B):** While heart and lung diseases are major components of the ASA score (e.g., a recent MI or COPD), the ASA grade is a **global assessment** of all systemic systems, not limited to one organ. Specific tools like the *Goldman Index* or *NYHA Classification* are used for cardiac status. * **Mental Status (D):** Mental status is only a small part of the overall clinical picture and is not the primary focus of the ASA grading. ### **High-Yield Facts for NEET-PG** * **ASA I:** Normal healthy patient (non-smoking, minimal alcohol). * **ASA II:** Mild systemic disease (e.g., controlled HTN, DM, pregnancy, obesity BMI 30-40). * **ASA III:** Severe systemic disease with **functional limitations** (e.g., poorly controlled DM, COPD, morbid obesity BMI >40). * **ASA IV:** Severe systemic disease that is a **constant threat to life** (e.g., recent <3 months MI, CVA, or ongoing cardiac ischemia). * **ASA V:** Moribund patient not expected to survive without the operation (e.g., ruptured aneurysm). * **ASA VI:** Declared brain-dead patient whose organs are being removed for donor purposes. * **Suffix 'E':** Added to any class to denote an **Emergency** surgery (e.g., ASA IIE).

Q: A patient scheduled for elective hip surgery is currently taking aspirin, enalapril, a multivitamin, and metoprolol. The surgery is planned in 5 days. What is the appropriate perioperative management for this patient?

Stop enalapril. ***Correct: Stop enalapril*** - **ACE inhibitors (enalapril) should be discontinued 24-48 hours before elective surgery** - Risk of **refractory intraoperative hypotension** during anesthesia induction, particularly with vasodilatory anesthetics - Associated with increased perioperative complications including hypotension requiring vasopressor support - Can be safely restarted postoperatively once hemodynamic stability is achieved *Incorrect: Stop aspirin to minimize perioperative bleeding risk* - **Aspirin should generally be continued** in patients with cardiovascular indications (CAD, stroke prevention) - Current guidelines recommend continuation for most surgeries except those with very high bleeding risk (neurosurgery, posterior chamber eye surgery) - **Hip surgery is NOT a contraindication** to aspirin continuation - The cardiovascular risk of stopping aspirin outweighs bleeding risk in most cases *Incorrect: Stop metoprolol to increase cardiac output* - **Beta-blockers should be continued perioperatively** in patients already taking them - Abrupt withdrawal increases risk of **rebound hypertension, tachycardia, myocardial ischemia, and MI** - Stopping beta-blockers can precipitate life-threatening cardiovascular events - Should be given on the morning of surgery with a sip of water *Incorrect: Increase aspirin dosage for additional analgesic benefit* - No indication to increase aspirin dose perioperatively - Aspirin is not used as a primary analgesic in surgical settings - Increasing dose would unnecessarily increase bleeding risk without therapeutic benefit

Q: A 56-year-old female has been diagnosed with gallstones and is undergoing a preanaesthesia checkup. She has been a diabetic since last 15 years, but sugar levels are within the limits. Which category of physical status does she fit into?

ASA 2. ***ASA 2*** - The patient has **well-controlled diabetes**, which is considered a mild systemic disease. - An ASA 2 patient has mild systemic disease that does not significantly limit activity. *ASA 1* - This category is for a **healthy person** with no systemic disease. - The patient's diabetes, even if controlled, precludes her from being classified as ASA 1. *ASA 4* - This category indicates a patient with **severe systemic disease** that is a constant threat to life. - Well-controlled diabetes does not pose an immediate threat to life. *ASA 3* - This category is for a patient with **severe systemic disease** that limits activity but is not incapacitating. - Well-controlled diabetes is generally considered a mild, not severe, systemic disease in the absence of complications.

Q: Perioperative benefit from transfusion is with a haemoglobin level of

6 - 8 gm/dl. **6 - 8 gm/dl** - Transfusions are generally recommended for **symptomatic anemia** or when the hemoglobin level falls below **7 g/dL** in most patients. - For patients undergoing surgery, a hemoglobin range of **6-8 gm/dl** often indicates a need for transfusion to optimize oxygen delivery and prevent complications. *8 - 10 gm/dl* - Hemoglobin levels in this range are often considered stable enough for many patients, and transfusion may not be necessary unless there are specific **cardiovascular risks** or **acute bleeding**. - Routine transfusion for non-symptomatic patients with hemoglobin in this range has not shown significant perioperative benefit and can expose patients to transfusion risks. *< 6 gm/dl* - A hemoglobin level below **6 gm/dl** typically indicates **severe anemia** and almost always warrants transfusion regardless of surgical context due to the high risk of **tissue hypoxia** and organ dysfunction. - While transfusion is definitely beneficial in this range, the question asks about the range where benefit *commences* for perioperative settings, which typically falls slightly higher to prevent severe drops. *> 10 gm/dl* - A hemoglobin level **above 10 gm/dl** is generally considered good and does not usually require transfusion, even in the perioperative setting. - Transfusing patients with hemoglobin levels above this threshold is associated with **no significant clinical benefit** and increases the risk of transfusion-related adverse events.

Question 1

According to current guidelines, how many hours before surgery should solids per oral be stopped?

Accepted Answer

6 hours

Answer

4 hours

Answer

8 hours

Answer

10 hours

Question 2

A 65-year-old man with a history of severe COPD (chronic smoker), diabetes mellitus (on insulin and metformin), and hypertension (on antihypertensive medications), not on regular follow-up, is scheduled for emergency laparoscopic appendectomy. He experiences dyspnea on walking more than a few meters. According to the ASA physical status classification system, to which class would this patient be assigned?

Accepted Answer

ASA Class 4E

Answer

ASA Class 3E

Answer

ASA Class 3

Answer

ASA Class 4

Question 3

How many days before surgery should lithium be stopped?

Accepted Answer

3 days

Answer

1 day

Answer

2 days

Answer

4 days

Question 4

Elective dental extractions on a patient who has had a myocardial infarct two months prior are best:

Accepted Answer

Postponed until at least six months have elapsed

Answer

Performed under oral valium sedation

Answer

Performed using an epinephrine-free local anesthetic

Answer

Performed using both of the above

Question 5

What is the ASA grading system used to assess?

Accepted Answer

Surgical patient risk factors

Answer

Cardiac status

Answer

Respiratory status

Answer

Mental status

Question 6

A patient is on regular medications for co-existing medical problems. Which of the following drugs may be stopped safely with minimal risk of adverse effects before an abdominal surgery?

Accepted Answer

ACE inhibitors/ACE Receptor Blockers

Answer

Statins

Answer

Beta blockers

Answer

Steroids

Question 7

Which patient has the least risk of pulmonary aspiration of gastric contents during induction of anesthesia?

Accepted Answer

Markedly obese patient who has been NPO for eight hours

Answer

Patient fed coffee four hours before elective surgery

Answer

Patient scheduled for elective cesarean delivery and NPO for 20 hours

Answer

Patient NPO for four hours after a full meal

Question 8

A patient scheduled for elective hip surgery is currently taking aspirin, enalapril, a multivitamin, and metoprolol. The surgery is planned in 5 days. What is the appropriate perioperative management for this patient?

Accepted Answer

Stop enalapril

Answer

Stop aspirin to minimize perioperative bleeding risk

Answer

Stop metoprolol to increase cardiac output

Answer

Increase aspirin dosage for additional analgesic benefit

Question 9

A 56-year-old female has been diagnosed with gallstones and is undergoing a preanaesthesia checkup. She has been a diabetic since last 15 years, but sugar levels are within the limits. Which category of physical status does she fit into?

Accepted Answer

ASA 2

Answer

ASA 1

Answer

ASA 4

Answer

ASA 3

Question 10

Perioperative benefit from transfusion is with a haemoglobin level of

Accepted Answer

6 - 8 gm/dl

Answer

8 - 10 gm/dl

Answer

< 6 gm/dl

Answer

> 10 gm/dl

Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management — MCQs

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