Preoperative Evaluation and Management Practice Questions

Q: A patient who is a heavy smoker is scheduled for elective hernia repair. How long before surgery should smoking be stopped?

6-8 weeks. **Explanation:** The primary goal of preoperative smoking cessation is to reduce the risk of postoperative pulmonary complications (PPCs). **1. Why 6-8 weeks is correct:** Smoking cessation for **6-8 weeks** is the minimum duration required to significantly reduce the incidence of PPCs. This timeframe allows for: * **Restoration of ciliary function:** Improving the clearance of secretions. * **Reduction in sputum production:** Decreasing airway irritability and mucus plugging. * **Improvement in small airway function:** Enhancing gas exchange and lung compliance. * **Immune recovery:** Improving macrophage function to prevent postoperative pneumonia. **2. Analysis of incorrect options:** * **A & B (4-10 days):** While short-term abstinence (12–48 hours) is beneficial for cardiovascular health (it reduces carboxyhemoglobin levels and shifts the oxyhemoglobin dissociation curve to the right, improving oxygen delivery), it is **insufficient** to reduce pulmonary complications. In fact, stopping for only 1-2 weeks may paradoxically increase secretions and coughing due to the "awakening" of cilia. * **C (3-4 weeks):** While some physiological recovery begins, clinical studies show that the risk of PPCs does not significantly drop until the 6-8 week mark. **3. High-Yield Clinical Pearls for NEET-PG:** * **12-24 hours:** Carboxyhemoglobin levels normalize; heart rate and blood pressure stabilize. * **48 hours:** Ciliary function begins to recover. * **Paradoxical effect:** Short-term cessation (<4 weeks) may lead to increased sputum production and reactive airways; however, surgery should **never** be postponed solely because a patient stopped smoking recently. * **Nicotine Replacement Therapy (NRT):** It is generally recommended to help patients quit, as the benefits of quitting outweigh the risks of nicotine during the perioperative period.

Q: Which of the following medications can be continued on the day of surgery?

Statins. **Explanation:** The management of perioperative medications is a high-yield topic for NEET-PG, focusing on balancing the risk of withdrawal syndromes against the risk of surgical complications (like bleeding). **1. Why Statins (Option B) are correct:** Statins (HMG-CoA reductase inhibitors) should be **continued** on the day of surgery. Beyond their lipid-lowering effects, statins possess "pleiotropic effects," including anti-inflammatory properties and plaque stabilization. Continuing statins perioperatively reduces the risk of major adverse cardiovascular events (MACE) and postoperative mortality, especially in patients undergoing vascular surgery. **2. Why the other options are incorrect:** * **Heparin (Option A):** While Heparin has a short half-life, it is typically held prior to surgery to minimize intraoperative bleeding. For patients at high risk of thromboembolism, "bridging therapy" is used, but the dose is timed to ensure normal coagulation during the procedure. * **Warfarin (Option C):** This must be stopped **5 days** prior to surgery to allow the INR to normalize (<1.5). Failure to stop Warfarin poses a significant risk of uncontrollable surgical hemorrhage. * **Amitriptyline (Option D):** As a Tricyclic Antidepressant (TCA), it is generally **tapered and stopped** (usually 24–48 hours prior) because it can interact with anesthetic agents (e.g., sympathomimetics) leading to hypertensive crises or cardiac arrhythmias. **Clinical Pearls for NEET-PG:** * **Continue:** Antihypertensives (except ACEIs/ARBs), Beta-blockers (do not start acutely, but do not stop), Statins, and Thyroid medications. * **Stop:** ACE inhibitors/ARBs (24 hours prior to avoid refractory hypotension), Oral Hypoglycemics (on the morning of surgery), and Antiplatelets (Clopidogrel: 5–7 days prior). * **Steroids:** Never stop; patients on chronic steroids need "stress doses" to prevent adrenal crisis.

Q: Once pheochromocytoma is diagnosed, what is administered preoperatively?

Alpha adrenergic blocker. **Explanation:** The management of Pheochromocytoma is a high-yield topic in NEET-PG, focusing on the prevention of intraoperative hypertensive crises. **Why Alpha-Blockers are the Correct Choice:** Pheochromocytoma is a catecholamine-secreting tumor. Preoperative preparation requires **Alpha-adrenergic blockade** (e.g., Phenoxybenzamine or Prazosin) to be started at least 10–14 days before surgery. This achieves two goals: 1. **Vasodilation:** It counteracts the intense vasoconstriction caused by norepinephrine, thereby controlling blood pressure. 2. **Volume Expansion:** Chronic vasoconstriction leads to a contracted intravascular volume. Alpha-blockade allows for "re-expansion" of plasma volume, preventing profound hypotension after the tumor is removed. **Analysis of Incorrect Options:** * **Alpha-adrenergic agonist:** These (e.g., Phenylephrine) would cause further vasoconstriction, leading to a life-threatening hypertensive crisis. * **Beta-adrenergic blocker:** These are used **only after** adequate alpha-blockade is established. If given alone, they cause "unopposed alpha-stimulation," where the blockade of vasodilatory Beta-2 receptors leaves Alpha-1 receptors free to cause massive, lethal vasoconstriction. **Clinical Pearls for NEET-PG:** * **The Golden Rule:** Always "Alpha before Beta." Start Beta-blockers (e.g., Propranolol) only if tachycardia persists after 2–3 days of alpha-blockade. * **Roizen’s Criteria:** Used to judge the adequacy of preoperative blockade (BP <160/90 mmHg, absence of ST-T changes, and no more than one PVC every 5 minutes). * **Drug of Choice:** **Phenoxybenzamine** (non-selective, irreversible alpha-blocker) is the traditional gold standard. * **Intraoperative Crisis:** Managed with **Phentolamine** (bolus) or **Sodium Nitroprusside** (infusion).

Q: A 48-year-old patient with a history of stable angina becomes dyspneic after walking 3 km. To which ASA physical status classification system class does this patient belong?

III. ### Explanation The **ASA Physical Status Classification System** is a global standard used to assess a patient's preoperative physical state and predict perioperative risk. **Why Option C (ASA III) is Correct:** ASA III is defined as a patient with **severe systemic disease** that results in **functional limitation**. In this clinical scenario, the patient has stable angina (a chronic systemic condition). The key indicator is the development of dyspnea after walking 3 km. While the patient is "stable," the fact that their systemic disease limits their physical activity (functional limitation) categorizes them as ASA III. **Why Other Options are Incorrect:** * **Option A (ASA I):** Reserved for a normal, healthy, non-smoking patient with no systemic disease and minimal/no alcohol use. * **Option B (ASA II):** Represents a patient with **mild systemic disease** without substantive functional limitations. Examples include well-controlled DM/HTN, social drinking, or pregnancy. If the patient could walk long distances without symptoms, they might fall here. * **Option C (ASA IV):** Represents a patient with severe systemic disease that is a **constant threat to life**. Examples include unstable angina, recent MI (<3 months), or symptomatic CHF. **High-Yield Clinical Pearls for NEET-PG:** * **ASA V:** A moribund patient not expected to survive without the operation (e.g., ruptured aortic aneurysm). * **ASA VI:** A declared brain-dead patient whose organs are being removed for donor purposes. * **The "E" Suffix:** Added to any classification if the surgery is an **Emergency** (e.g., ASA IIE). * **Functional Capacity:** Often measured in METs (Metabolic Equivalents). Walking 3 km (roughly 2 miles) at a brisk pace is ~3-4 METs. Limitation at this level confirms "substantive" functional impairment.

Q: What is considered the ideal colloidal solution?

Albumin. **Explanation:** The "ideal" colloid is defined as a solution that provides effective volume expansion, remains in the intravascular space for a predictable duration, and has a superior safety profile with minimal side effects. **Why Albumin is the Correct Answer:** Albumin (specifically the 5% or 25% concentration) is considered the **gold standard or "ideal" colloid** because it is a naturally occurring plasma protein. It accounts for 70–80% of the normal plasma oncotic pressure. It is non-antigenic (when human-derived), does not interfere with blood grouping or coagulation, and carries no risk of nephrotoxicity. Furthermore, it possesses antioxidant and anti-inflammatory properties, making it physiologically superior to synthetic alternatives. **Analysis of Incorrect Options:** * **Dextran:** Associated with a high risk of anaphylaxis, interference with blood cross-matching, and impairment of platelet aggregation (increased bleeding). * **Plasma (FFP):** While natural, it is not used as a primary volume expander due to the risk of transfusion-transmitted infections (TTIs), TRALI (Transfusion-Related Acute Lung Injury), and the need for ABO compatibility. * **Hydroxyethyl Starch (HES):** Synthetic colloids like HES are associated with dose-dependent coagulopathy and significant risk of acute kidney injury (AKI), leading to "black box" warnings in critically ill patients. **NEET-PG High-Yield Pearls:** * **Intravascular Half-life:** Albumin remains in the circulation for approximately 16 hours in healthy individuals. * **Colloid vs. Crystalloid:** Colloids have a smaller volume of distribution (intravascular only) compared to crystalloids, requiring less volume (1:1 ratio) for resuscitation. * **SAFE Study:** This landmark trial proved that albumin is as safe as saline for fluid resuscitation, except in patients with Traumatic Brain Injury (TBI), where it may increase mortality.

Q: Which oral hypoglycemic drug should be discontinued prior to general anesthesia and surgery?

Metformin. **Explanation:** The correct answer is **Metformin**. **Why Metformin?** Metformin is a biguanide that inhibits mitochondrial respiration, leading to an increase in lactate production. During the perioperative period, factors such as hypotension, dehydration, hemorrhage, or renal hypoperfusion can occur. These conditions predispose the patient to **Lactic Acidosis**, a rare but life-threatening complication associated with Metformin. To mitigate this risk, Metformin is typically discontinued **24 to 48 hours** before elective major surgery. It is restarted only after renal function has stabilized and oral intake is resumed. **Analysis of Incorrect Options:** * **Glibenclamide & Gliclazide (Sulfonylureas):** These drugs stimulate insulin secretion and carry a high risk of **hypoglycemia** during periods of fasting (NPO status). While they are held on the **morning of the surgery**, they do not carry the same risk of metabolic acidosis as Metformin. * **Pioglitazone (Thiazolidinediones):** These drugs improve insulin sensitivity. While they can cause fluid retention, they do not pose an acute metabolic risk during anesthesia and are generally omitted only on the day of surgery. **Clinical Pearls for NEET-PG:** * **SGLT-2 Inhibitors (e.g., Empagliflozin):** These must be stopped **3–4 days** prior to surgery due to the risk of **euglycemic ketoacidosis**. * **Insulin Management:** Long-acting insulin is usually continued at a reduced dose (60-80%), while short-acting insulin is held while the patient is NPO. * **Gold Standard:** For major surgeries, the preferred method of glycemic control is a **Glucose-Insulin-Potassium (GIK) infusion** or a sliding scale insulin protocol.

Q: Which of the following represents an abnormal preoperative pulmonary function test finding in a patient with severe kyphoscoliosis?

Reduced RV and TLC. **Explanation:** Kyphoscoliosis is a classic example of an **Extrapulmonary Restrictive Lung Disease**. The spinal deformity leads to a distorted thoracic cage, reduced chest wall compliance, and displacement of abdominal contents, which collectively limit lung expansion. **1. Why Option A is Correct:** In restrictive lung diseases, the primary pathology is the inability to inhale a normal volume of air. This leads to a **proportional reduction in all lung volumes and capacities**. Specifically: * **TLC (Total Lung Capacity):** Reduced because the chest wall cannot expand fully. * **RV (Residual Volume):** Reduced in kyphoscoliosis due to the mechanical compression of the lungs (unlike obstructive diseases where RV increases due to air trapping). * **VC (Vital Capacity):** Significantly decreased, often used as a marker for the severity of the deformity. **2. Why Incorrect Options are Wrong:** * **B & C (Reduced FEV1/FVC and FEV25-75):** These are hallmarks of **Obstructive Lung Disease** (e.g., Asthma, COPD). In restrictive disease, the FEV1/FVC ratio is typically **normal or even increased** because both values decrease proportionately, or the increased elastic recoil of the lung tissue keeps airways open during expiration. * **D (Increased FRC):** Functional Residual Capacity is **decreased** in kyphoscoliosis. An increased FRC is seen in conditions with hyperinflation or air trapping (Obstructive diseases). **Clinical Pearls for NEET-PG:** * **PFT Pattern:** Restrictive = ↓ Volumes (TLC, VC, FRC, RV) + Normal/↑ FEV1/FVC Ratio. * **Surgical Risk:** Patients with a Vital Capacity **< 45%** of predicted or those with associated pulmonary hypertension are at high risk for postoperative respiratory failure. * **Complication:** Long-standing kyphoscoliosis leads to **cor pulmonale** and chronic alveolar hypoventilation (Type 2 Respiratory Failure).

Question 1

A patient who is a heavy smoker is scheduled for elective hernia repair. How long before surgery should smoking be stopped?

Accepted Answer

6-8 weeks

Answer

4 days

Answer

10 days

Answer

3-4 weeks

Question 2

Which of the following does not represent a significant anaesthetic problem in the morbidly obese patient?

Accepted Answer

Decreased cardiac output relative to total body mass

Answer

Difficulties in endotracheal intubation

Answer

Suboptimal arterial oxygen tension

Answer

Increased metabolism of volatile agents

Question 3

Which of the following medications can be continued on the day of surgery?

Accepted Answer

Statins

Answer

Heparin

Answer

Warfarin

Answer

Amitriptyline

Question 4

Once pheochromocytoma is diagnosed, what is administered preoperatively?

Accepted Answer

Alpha adrenergic blocker

Answer

Alpha adrenergic agonist

Answer

Beta adrenergic blocker

Answer

Beta adrenergic blocker

Question 5

A 48-year-old patient with a history of stable angina becomes dyspneic after walking 3 km. To which ASA physical status classification system class does this patient belong?

Accepted Answer

III

Answer

I

Answer

II

Answer

IV

Question 6

What is considered the ideal colloidal solution?

Accepted Answer

Albumin

Answer

Dextran

Answer

Plasma

Answer

Hydroxyethyl starch

Question 7

A 32-year-old ex-heroin addict with hepatitis C requires an urgent laparotomy for the treatment of a perforated duodenal ulcer. The patient is undergoing treatment with naltrexone. The results of pre-operative coagulation studies include an INR for the prothrombin time of 1.8 and a platelet count of 85,000/cubic mm. Given this scenario, which of the following post-operative analgesic techniques would be most appropriate?

Accepted Answer

Ketamine patient-controlled analgesia.

Answer

Local anesthetic-based epidural analgesia.

Answer

Intramuscular Methadone.

Answer

Fentanyl-based epidural analgesia.

Question 8

Which oral hypoglycemic drug should be discontinued prior to general anesthesia and surgery?

Accepted Answer

Metformin

Answer

Pioglitazone

Answer

Glibenclamide

Answer

Gliclazide

Question 9

Which of the following represents an abnormal preoperative pulmonary function test finding in a patient with severe kyphoscoliosis?

Accepted Answer

Reduced RV and TLC

Answer

Reduced FEV1/FVC

Answer

Reduced FEV25-75

Answer

Increased FRC

Question 10

What is the target hemoglobin level to be maintained in patients with underlying serious heart disease?

Accepted Answer

11 g/dl

Answer

8 g/dl

Answer

9 g/dl

Answer

10 g/dl

Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management — MCQs

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