Preoperative and Postoperative Care Practice Questions

Q: Which of the following is NOT considered a high-risk factor for deep vein thrombosis (DVT)?

Surgery lasting for 30 minutes or more. **Explanation:** The risk of Deep Vein Thrombosis (DVT) in surgical patients is categorized into low, moderate, and high risk based on the **Virchow’s Triad** (stasis, hypercoagulability, and endothelial injury). **Why Option D is the Correct Answer:** Surgery lasting for **30 minutes or more** is generally classified as a **moderate-risk** factor, not a high-risk factor. According to standard risk stratification (like the Caprini Score), minor surgeries (under 45–60 minutes) in patients without other risk factors carry a low risk. While duration increases risk, the 30-minute threshold is insufficient on its own to categorize a patient as "high risk" unless accompanied by significant comorbidities or major trauma. **Analysis of Incorrect Options (High-Risk Factors):** * **A. General urological surgery (>40 years):** Age over 40 combined with major surgery significantly increases venous stasis and is a recognized high-risk category. * **B. Extensive pelvic or abdominal surgery:** These procedures (especially for malignancy) involve prolonged immobilization and potential direct pressure on the iliac veins, placing them in the high-risk group. * **C. Major orthopedic surgery:** Procedures like Total Hip Replacement (THR) or Total Knee Replacement (TKR) are the classic "highest risk" scenarios due to extensive bone trauma and prolonged post-operative immobility. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Contrast Venography (rarely used now); **Duplex Ultrasound** is the initial investigation of choice. * **Prophylaxis:** Low Molecular Weight Heparin (LMWH) is preferred over Unfractionated Heparin (UFH) for its predictable pharmacokinetics. * **Highest Risk Surgery:** Orthopedic surgeries (Hip/Knee) and major pelvic surgeries for malignancy. * **Virchow’s Triad:** Stasis, Vessel wall injury, and Hypercoagulability are the three pillars of thrombus formation.

Q: Which of the following nutrients are not typically included in Total Parenteral Nutrition (TPN)?

Fibers. **Explanation:** Total Parenteral Nutrition (TPN) is the intravenous administration of all necessary nutrients to patients who cannot or should not use their gastrointestinal tract. The fundamental principle of TPN is that nutrients must be in their most basic, **water-soluble form** to be infused directly into the bloodstream. **Why Fibers is the Correct Answer:** * **Fibers** are complex carbohydrates (polysaccharides) that are non-digestible. Their primary physiological role occurs within the lumen of the gut (promoting peristalsis and supporting microbiome health). Since TPN bypasses the digestive system entirely, fiber has no role in intravenous therapy. Furthermore, fiber is insoluble and cannot be infused into the vascular system as it would cause immediate embolic complications. **Why the Other Options are Incorrect:** * **A. Lipids:** These are essential in TPN to provide a concentrated source of energy and prevent Essential Fatty Acid Deficiency (EFAD). They are typically delivered as egg-yolk phospholipid-emulsified soybean or safflower oil. * **B. Carbohydrates:** Provided in the form of **Dextrose monohydrate**. It is the primary energy source in TPN, providing approximately 3.4 kcal/gram. * **C. Proteins:** Provided as **crystalline L-amino acids**. These are essential for maintaining a positive nitrogen balance and promoting tissue repair in surgical patients. **High-Yield Clinical Pearls for NEET-PG:** * **Route:** TPN with high osmolarity (>900 mOsm/L) must be administered via a **Central Venous Line** (usually the Subclavian vein) to prevent thrombophlebitis. * **Most Common Complication:** Catheter-related sepsis (usually *Staphylococcus aureus* or *Candida*). * **Most Common Metabolic Complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by severe **Hypophosphatemia**, Hypokalemia, and Hypomagnesemia when nutrition is reintroduced too rapidly in malnourished patients.

Q: When should preoperative shaving ideally be performed?

Just before the operation. **Explanation:** The primary goal of preoperative hair removal is to minimize the risk of **Surgical Site Infections (SSI)**. **Why "Just before the operation" is correct:** When hair is shaved, it inevitably causes microscopic abrasions and nicks on the skin surface. If shaving is done hours or days in advance, these micro-injuries provide a fertile breeding ground for skin flora (like *Staphylococcus aureus*) to colonize and multiply. By performing the procedure **just before the operation** (ideally in the preoperative holding area), the time window for bacterial colonization is minimized, significantly reducing the risk of postoperative infection. **Analysis of Incorrect Options:** * **A & B (Evening before/Morning of):** These options are incorrect because the longer the interval between shaving and the incision, the higher the rate of SSI due to bacterial growth in the skin nicks. * **D (At the operation table):** While timing-wise this is safe, it is practically discouraged because loose hair can fly into the sterile field or onto the surgical drapes, compromising the sterile environment. **NEET-PG High-Yield Pearls:** 1. **Gold Standard:** Current guidelines (CDC and WHO) state that hair should **not** be removed unless it interferes with the surgery. 2. **Method of Choice:** If hair removal is necessary, **Electric Clippers** are superior to razors. Razors increase SSI risk; clippers do not. 3. **Depilatory Creams:** These are effective but must be tested 48 hours prior to avoid hypersensitivity reactions. 4. **Summary of Risk:** SSI risk is highest with razors (especially if done 24h prior) and lowest with no hair removal or clipping immediately before surgery.

Q: During nutritional assessment of a surgical patient, which parameter best indicates the status of muscle protein?

Mid-arm circumference. **Explanation:** Nutritional assessment is a critical component of preoperative care to predict surgical outcomes and wound healing. **1. Why Mid-arm Circumference (MAC) is correct:** Mid-arm circumference is a direct anthropometric measurement used to estimate **skeletal muscle mass** (somatic protein stores). Since the mid-arm consists primarily of bone, muscle, and subcutaneous fat, MAC (specifically when used to calculate Mid-Arm Muscle Circumference) serves as a reliable bedside indicator of the body's protein reserves. In states of protein-energy malnutrition, muscle wasting occurs, leading to a decrease in this measurement. **2. Why the other options are incorrect:** * **Serum Albumin:** While commonly used, it is a marker of **visceral protein** status, not muscle protein. It has a long half-life (20 days) and is heavily influenced by hydration status and systemic inflammation (negative acute-phase reactant), making it a poor indicator of acute nutritional changes. * **Triceps Skinfold Thickness (TSF):** This measures subcutaneous fat stores, reflecting the body's **energy (calorie) reserves** rather than protein status. * **Hemoglobin Level:** This reflects iron status and erythropoiesis; while it may be low in malnutrition, it is not a specific or sensitive indicator of muscle protein. **Clinical Pearls for NEET-PG:** * **Best indicator of acute nutritional change:** Serum Prealbumin (Transthyretin) – due to its short half-life of 2 days. * **Best indicator of long-term nutritional status:** Serum Albumin. * **Subjective Global Assessment (SGA):** The "Gold Standard" clinical tool for bedside nutritional assessment, combining history and physical examination. * **Nitrogen Balance:** The most accurate way to measure the adequacy of protein intake in a clinical setting.

Question 1

What is the commonest cause of mortality in liver-related operations?

Accepted Answer

Anastomotic leak

Answer

Pulmonary atelectasis

Answer

Thoracic duct fistula

Answer

Subdiaphragmatic collection

Question 2

Which of the following is NOT considered a high-risk factor for deep vein thrombosis (DVT)?

Accepted Answer

Surgery lasting for 30 minutes or more

Answer

General urological surgery in patients over 40 years of age

Answer

Extensive pelvic or abdominal surgery

Answer

Major orthopedic surgery of the lower limbs

Question 3

What is the most common complication associated with Total Parenteral Nutrition?

Accepted Answer

Catheter related infection

Answer

Hyperglycemia

Answer

Pneumothorax

Answer

Hyperkalemia

Question 4

Oral anticoagulants are stopped prior to surgery for at least how many days?

Accepted Answer

6-8 days

Answer

1-3 days

Answer

3-5 days

Answer

8-10 days

Question 5

Which of the following nutrients are not typically included in Total Parenteral Nutrition (TPN)?

Accepted Answer

Fibers

Answer

Lipids

Answer

Carbohydrates

Answer

Proteins

Question 6

A patient presents with swelling in the neck following a thyroidectomy. What is the most likely resulting complication?

Accepted Answer

Respiratory obstruction

Answer

Recurrent laryngeal nerve palsy

Answer

Hypovolemia

Answer

Hypocalcemia

Question 7

When should preoperative shaving ideally be performed?

Accepted Answer

Just before the operation

Answer

Evening before the operation

Answer

Morning of the operation

Answer

At the operation table

Question 8

Which is the preferred vein for initiating total parenteral nutrition?

Accepted Answer

Subclavian vein

Answer

Femoral vein

Answer

Brachial vein

Answer

Saphenous vein

Question 9

All of the following are associated with an increased incidence of abdominal wound dehiscence EXCEPT?

Accepted Answer

Closure of the wound with a continuous suture

Answer

Bringing a stoma through the incision

Answer

Presence of ascites

Answer

Presence of jaundice

Question 10

During nutritional assessment of a surgical patient, which parameter best indicates the status of muscle protein?

Accepted Answer

Mid-arm circumference

Answer

Serum albumin

Answer

Triceps skinfold thickness

Answer

Hemoglobin level

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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