Preoperative Evaluation and Management Practice Questions

Q: A 40-year-old lady presents with a large left parietal convexity meningioma with perilesional edema. She is scheduled for surgery the next day. Which of the following pre-operative notes would be inappropriate to document?

Stop steroids.. **Explanation:** The correct answer is **D (Stop steroids)** because this action is contraindicated in the preoperative management of a patient with a brain tumor and perilesional edema. **1. Why "Stop steroids" is inappropriate:** Brain tumors, such as meningiomas, often cause **vasogenic edema** due to the breakdown of the blood-brain barrier. This increases intracranial pressure (ICP). **Corticosteroids (specifically Dexamethasone)** are the mainstay of treatment to reduce this edema and improve neurological status before surgery. Stopping steroids abruptly would worsen the edema, potentially leading to herniation or intraoperative brain swelling (tight brain). **2. Analysis of Incorrect Options:** * **Option A (Anti-epileptics):** Supratentorial tumors (like a parietal meningioma) carry a high risk of seizures. Prophylactic or therapeutic anti-epileptic drugs (AEDs) are standard to prevent perioperative seizures. * **Option B (Head wash):** Preoperative scalp hygiene with antiseptic shampoo (like Chlorhexidine) is a standard neurosurgical protocol to reduce the microbial load and prevent Surgical Site Infections (SSI). * **Option C (Antibiotic sensitivity):** Documenting allergies or sensitivities is a vital part of the WHO Surgical Safety Checklist to ensure safe administration of prophylactic antibiotics before the incision. **Clinical Pearls for NEET-PG:** * **Drug of Choice:** Dexamethasone is preferred in neurosurgery due to its high potency, long half-life, and minimal mineralocorticoid (salt-retaining) activity. * **Cushing’s Triad:** A sign of high ICP—Hypertension, Bradycardia, and Irregular Respiration. * **Mannitol:** Used intraoperatively to "relax" the brain by osmotic diuresis, but steroids are the primary choice for long-term vasogenic edema management.

Q: A 38-year-old hypothyroid female patient presents for uterine fibroid excision. She is 5'5" and weighs 60 kg. She last ate at 8 PM the previous night and took her thyroxine tablet with a sip of water in the morning. If the surgery is scheduled to start at 8 AM, what is her estimated fluid deficit?

1.2 L. ### Explanation The calculation of preoperative fluid deficit is a high-yield topic in Anesthesiology, based on the **4-2-1 Rule** (Holliday-Segar formula) for maintenance fluid requirements and the duration of fasting. **1. Step-by-Step Calculation:** * **Maintenance Fluid Requirement:** For a 60 kg patient: * First 10 kg: 10 × 4 mL/hr = 40 mL/hr * Next 10 kg: 10 × 2 mL/hr = 20 mL/hr * Remaining 40 kg: 40 × 1 mL/hr = 40 mL/hr * **Total Maintenance Rate:** 40 + 20 + 40 = **100 mL/hr** * **Fasting Duration:** The patient last ate at 8 PM and the surgery is at 8 AM, totaling **12 hours** of fasting. * **Fluid Deficit:** Maintenance Rate × Fasting Hours = 100 mL/hr × 12 hours = **1200 mL (1.2 L).** **2. Analysis of Options:** * **Option B (1.2 L) is correct** as it accurately reflects the product of the hourly maintenance requirement and the fasting interval. * **Options A, C, and D** are incorrect because they result from miscalculating the maintenance rate (e.g., using a flat 2 mL/kg/hr) or miscounting the fasting hours. **3. Clinical Pearls for NEET-PG:** * **Thyroxine Management:** Patients should continue thyroid medications on the morning of surgery with a sip of water to maintain a euthyroid state, as seen in this vignette. * **Deficit Replacement:** In clinical practice, the calculated deficit is typically replaced using the **50-25-25 rule**: 50% in the 1st hour of surgery, 25% in the 2nd hour, and 25% in the 3rd hour (in addition to maintenance and blood loss). * **NPO Guidelines:** While this patient fasted for 12 hours, standard ASA guidelines allow clear liquids up to 2 hours and a light meal up to 6 hours before induction.

Q: What is the purpose of pre-anesthetic medication?

All of the above. The primary goal of pre-anesthetic medication (premedication) is to prepare the patient physically and psychologically for surgery, ensuring a smooth induction, maintenance, and recovery from anesthesia. **Explanation of Options:** * **To relieve anxiety (Anxiolysis):** This is a core objective. Psychological stress triggers a sympathetic surge (tachycardia, hypertension). Drugs like Benzodiazepines (e.g., Midazolam) are used to provide sedation and amnesia, making the patient more cooperative. * **To decrease the dose of anesthetic drugs:** Premedication with opioids (e.g., Fentanyl) or α2-agonists (e.g., Clonidine/Dexmedetomidine) provides basal analgesia and sedation. This synergistic effect reduces the Minimum Alveolar Concentration (MAC) of inhalational agents and the required dose of intravenous induction agents (Propofol/Thiopental), thereby increasing the safety margin. * **To decrease post-operative complications:** Premedication addresses specific risks. For example, H2-blockers or Proton Pump Inhibitors (PPIs) reduce gastric acidity to prevent aspiration pneumonitis (Mendelson’s Syndrome). Antiemetics (e.g., Ondansetron) reduce Post-Operative Nausea and Vomiting (PONV), and anticholinergics (e.g., Glycopyrrolate) prevent excessive secretions and vagal bradycardia. Since all these factors contribute to perioperative safety and patient comfort, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Midazolam:** Most common premedication for anxiolysis and anterograde amnesia. * **Mendelson’s Syndrome:** Risk is high if gastric pH 0.4 ml/kg (25 ml). * **Glycopyrrolate:** Preferred over Atropine as an antisialogogue because it does not cross the blood-brain barrier (quaternary ammonium) and causes less tachycardia. * **Clonidine:** Reduces anesthetic requirements and provides hemodynamic stability.

Q: Ringer lactate is a:

Isotonic crystalloid solution. **Explanation:** **Ringer’s Lactate (RL)**, also known as Hartmann's solution, is the most commonly used **isotonic crystalloid** in perioperative care. 1. **Why Option A is Correct:** An isotonic solution has an osmolarity similar to that of human plasma (~285–295 mOsm/L). The calculated osmolarity of RL is approximately **273 mOsm/L**. While technically slightly hypo-osmolar in a lab setting, it behaves as an **isotonic** solution clinically because it maintains the effective osmotic pressure across semi-permeable cell membranes, preventing significant fluid shifts between the intracellular and extracellular compartments. 2. **Why Other Options are Incorrect:** * **Hypertonic (B):** Solutions like 3% Saline or Mannitol have much higher osmolarity than plasma, causing water to move out of cells. * **Hypotonic (C):** Solutions like 0.45% Saline (Half-normal saline) have lower osmolarity, causing cells to swell. * **Colloid (D):** Colloids (e.g., Albumin, Hetastarch) contain large molecules that do not cross the capillary membrane. RL consists of small electrolytes (Sodium, Potassium, Calcium, Chloride) and Lactate, making it a crystalloid. **High-Yield Clinical Pearls for NEET-PG:** * **Composition:** Na⁺ (130), Cl⁻ (109), K⁺ (4), Ca²⁺ (3), and Lactate (28) in mEq/L. * **Metabolism:** The lactate in RL is converted by the **liver** into bicarbonate, making it useful in treating metabolic acidosis. * **Contraindications:** * Avoid in **Traumatic Brain Injury (TBI)** as its slight hypo-osmolarity can worsen cerebral edema. * Do not co-administer with **blood transfusions** in the same IV line; the Calcium in RL can bind with the Citrate anticoagulant in blood bags, leading to clot formation. * Use cautiously in severe liver failure (impaired lactate metabolism).

Q: What does the ASA grading system evaluate in anesthesia?

Physical status. **Explanation:** The **ASA (American Society of Anesthesiologists) Physical Status Classification System** is a standardized tool used to assess a patient's overall health and physiological state before surgery. It is designed to categorize patients based on their systemic health and comorbidities, which helps in predicting perioperative risks. **Why Physical Status is Correct:** The ASA grading focuses on the severity of systemic diseases. It ranges from **ASA I** (a normal healthy patient) to **ASA VI** (a declared brain-dead patient whose organs are being removed for donor purposes). The addition of an **'E'** suffix denotes an emergency procedure. It is a measure of "physical status" rather than specific organ function or surgical complexity. **Why Other Options are Incorrect:** * **Mental Status:** While a patient's neurological state is assessed during the pre-anesthetic check-up (PAC), it is not the primary basis of the ASA grade. * **Respiratory Status:** This is a component of the physical status (e.g., COPD or Asthma), but the ASA grade is a global assessment of all systemic diseases, not just the respiratory system. * **Socio-economic Status:** This has no clinical bearing on the ASA classification, which is strictly medical. **High-Yield Clinical Pearls for NEET-PG:** * **ASA I:** Healthy, non-smoking, no/minimal alcohol. * **ASA II:** Mild systemic disease (e.g., controlled HTN, controlled DM, BMI 30-40, social smoker). * **ASA III:** Severe systemic disease with functional limitations (e.g., poorly controlled DM, BMI >40, history of MI >3 months ago). * **ASA IV:** Severe systemic disease that is a constant threat to life (e.g., recent MI <3 months, ongoing ischemia, sepsis). * **ASA V:** Moribund patient not expected to survive without the operation. * **Note:** ASA grade is a subjective assessment of physical status and does **not** directly measure "anesthetic risk," though it correlates with it.

Question 1

A 40-year-old lady presents with a large left parietal convexity meningioma with perilesional edema. She is scheduled for surgery the next day. Which of the following pre-operative notes would be inappropriate to document?

Accepted Answer

Stop steroids.

Answer

Initiate anti-epileptic treatment if not already started.

Answer

Wash the head with antiseptic shampoo.

Answer

Document antibiotic sensitivity if applicable.

Question 2

What is the minimum acceptable hematocrit value for elective oral surgery?

Accepted Answer

30%

Answer

11%

Answer

18%

Answer

23%

Question 3

A 38-year-old hypothyroid female patient presents for uterine fibroid excision. She is 5'5" and weighs 60 kg. She last ate at 8 PM the previous night and took her thyroxine tablet with a sip of water in the morning. If the surgery is scheduled to start at 8 AM, what is her estimated fluid deficit?

Accepted Answer

1.2 L

Answer

1.5 L

Answer

1.4 L

Answer

1.6 L

Question 4

A 60-year-old hypertensive patient on angiotensin II receptor antagonists (losartan) is scheduled for hernia repair surgery. How should the antihypertensive medication be managed perioperatively?

Accepted Answer

Continue till the day of operation

Answer

Discontinue 24 hours preoperatively

Answer

Discontinue one week preoperatively

Answer

Administer in increased dosage on the day of operation

Question 5

What is the purpose of pre-anesthetic medication?

Accepted Answer

All of the above

Answer

To decrease the dose of anesthetic drugs

Answer

To decrease post-operative complications

Answer

To relieve anxiety

Question 6

Ringer lactate is a:

Accepted Answer

Isotonic crystalloid solution

Answer

Hypertonic crystalloid solution

Answer

Hypotonic crystalloid solution

Answer

Isotonic colloid solution

Question 7

What are the benefits of stopping smoking before surgery, excluding one?

Accepted Answer

Less risk of malignancies associated with smoking

Answer

Better wound healing

Answer

Better mucociliary clearance

Answer

Better bone healing

Question 8

A patient presents with hypovolemia and a serum sodium level of 154 mEq/L. What is the initial treatment recommended?

Accepted Answer

Normal saline

Answer

Half normal saline with 5% dextrose

Answer

Dextran 40

Answer

Ringer's lactate

Question 9

What does the ASA grading system evaluate in anesthesia?

Accepted Answer

Physical status

Answer

Mental status

Answer

Respiratory status

Answer

Socio-economic status

Question 10

A 60-year-old woman with a history of diabetes, hypertension, and dyspnea on exertion undergoes pre-anesthetic evaluation for cataract repair. Her ECG shows normal sinus rhythm with left axis deviation. What is the recommended approach for this patient?

Accepted Answer

No further testing is required; proceed with surgery.

Answer

Order a treadmill test for further cardiac evaluation.

Answer

Perform 2D echocardiography.

Answer

Declare the patient unfit for surgery.

Preoperative Evaluation and Management — MCQs

Preoperative Evaluation and Management — MCQs

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