Preoperative and Postoperative Care Practice Questions

Q: Thromboembolism after pelvic surgery is usually from which veins?

Femoral. **Explanation:** The correct answer is **Femoral (Option C)**. While deep vein thrombosis (DVT) can originate in various sites, the **iliofemoral segment** (specifically the femoral and popliteal veins) is the most common source of clinically significant pulmonary embolism (PE) following major abdominal or pelvic surgeries. 1. **Why Femoral is Correct:** In the context of pelvic surgery, the combination of venous stasis (due to positioning and immobility) and local vessel manipulation leads to thrombus formation. Although thrombi often begin in the calf, those that propagate into the **femoral vein** are larger, less adherent to the vessel wall, and have a much higher propensity to embolize to the lungs. 2. **Why other options are incorrect:** * **Calf (Option B):** This is the most common site for *initial* DVT formation. However, calf vein thrombi are usually small and rarely cause significant PE unless they propagate proximally into the popliteal or femoral veins. * **Iliac (Option A) & Pelvic (Option D):** While pelvic surgery involves these areas, isolated pelvic or iliac vein thrombosis is less common than femoral involvement. Pelvic venous plexuses are more frequently associated with septic thrombophlebitis rather than standard postoperative thromboembolism. **High-Yield Clinical Pearls for NEET-PG:** * **Virchow’s Triad:** Stasis, endothelial injury, and hypercoagulability are the pillars of DVT pathogenesis. * **Gold Standard Diagnosis:** Contrast Venography (rarely used now); **Duplex Ultrasound** is the initial investigation of choice. * **Prophylaxis:** Low Molecular Weight Heparin (LMWH) is the standard of care for high-risk pelvic surgery patients. * **Fatal PE:** Most fatal pulmonary emboli originate from the proximal deep veins of the lower limbs (thigh).

Q: Paradoxical aciduria is seen in:

Pyloric obstruction. **Explanation:** **Paradoxical Aciduria** is a classic metabolic derangement seen in **Infantile Hypertrophic Pyloric Stenosis (IHPS)** or adult gastric outlet obstruction. **Pathophysiology:** 1. **Initial Insult:** Persistent vomiting leads to loss of HCl, resulting in **Hypochloremic Hypokalemic Metabolic Alkalosis**. 2. **Renal Compensation:** Initially, the kidney tries to excrete excess bicarbonate ($HCO_3^-$). To maintain electrical neutrality, it excretes Sodium ($Na^+$) along with it. 3. **Dehydration:** As vomiting continues, the body becomes volume-depleted. The Renin-Angiotensin-Aldosterone System (RAAS) is activated to conserve $Na^+$. 4. **The "Paradox":** In the distal tubule, the kidney must reabsorb $Na^+$. Normally, it exchanges $Na^+$ for $K^+$. However, due to chronic vomiting, the body is already **hypokalemic**. To save the remaining $K^+$, the kidney is forced to exchange $Na^+$ for Hydrogen ions ($H^+$) instead. 5. **Result:** Despite the systemic state being alkalotic, the urine becomes acidic. **Analysis of Incorrect Options:** * **A & D (Intestinal/Enterocutaneous Fistula):** These typically result in the loss of alkaline succus entericus (bicarbonate-rich fluid), leading to **Metabolic Acidosis**, not alkalosis. * **B (Vesico-vaginal fistula):** This is a structural communication between the bladder and vagina causing urinary incontinence; it does not cause systemic electrolyte or acid-base disturbances. **High-Yield Clinical Pearls for NEET-PG:** * **The "Vicious Cycle":** Paradoxical aciduria signifies severe, late-stage dehydration and electrolyte depletion. * **Treatment Priority:** Never rush to surgery. Correct dehydration with **0.9% Normal Saline** (to provide $Cl^-$) and add **Potassium** once urine output is established. * **Key Electrolyte Finding:** Low $Cl^-$, Low $K^+$, High $pH$ (Systemic), Low $pH$ (Urine).

Q: Marie, a 51-year-old woman, is diagnosed with cholecystitis. Which diet, when selected by the client, indicates that the nurse’s teaching has been successful?

Low-fat, high-carbohydrate meals. **Explanation** The primary goal of dietary management in cholecystitis is to prevent gallbladder contraction and minimize pain. **1. Why Option C is Correct:** The gallbladder's physiological function is to store and concentrate bile, which is released into the duodenum in response to **Cholecystokinin (CCK)**. CCK secretion is primarily triggered by the presence of **fats** in the small intestine. In cholecystitis, gallbladder contraction against an obstructed duct or an inflamed wall causes biliary colic. A **low-fat diet** minimizes CCK release, thereby ensuring "gallbladder rest." **High-carbohydrate** and moderate-protein intake are encouraged to meet caloric requirements and promote tissue healing without stimulating the gallbladder. **2. Why the Other Options are Incorrect:** * **Options B & D:** High-fat meals are the primary trigger for gallbladder contraction and will exacerbate symptoms, potentially leading to complications like empyema or perforation. * **Option A:** While small, frequent meals are generally well-tolerated, a **low-carbohydrate** diet is unnecessary and does not address the underlying pathophysiology of fat-induced biliary pain. **3. NEET-PG High-Yield Pearls:** * **Hormonal Control:** CCK is produced by **I-cells** in the duodenum and jejunum. It causes gallbladder contraction and relaxation of the **Sphincter of Oddi**. * **Post-operative Care:** Following a cholecystectomy, patients may initially require a low-fat diet, but most can eventually return to a normal diet as the bile duct undergoes compensatory dilation to store bile. * **Murphy’s Sign:** Sudden cessation of inspiration during deep palpation of the right hypochondrium—a classic clinical sign of acute cholecystitis. * **Investigation of Choice:** Ultrasonography is the initial screening tool; **HIDA scan** is the most sensitive/gold standard for diagnosing acute cholecystitis.

Q: Which of the following is NOT an indication for total parenteral nutrition?

Chronic liver disease. **Explanation:** The core principle of nutritional support is: **"If the gut works, use it."** Total Parenteral Nutrition (TPN) is indicated only when the gastrointestinal tract is non-functional, inaccessible, or requires complete rest. **Why Chronic Liver Disease is the correct answer:** In **Chronic Liver Disease (CLD)**, the gut is usually functional. Patients are managed with specialized enteral diets (high calorie, low protein if encephalopathy is present). TPN is generally avoided because the liver is the primary site for metabolizing TPN components (lipids and amino acids). TPN can actually worsen liver dysfunction by causing steatosis or cholestasis (TPN-induced cholestasis). **Analysis of Incorrect Options:** * **Enterocolic and Faecal Fistulae:** High-output proximal fistulae are classic indications for TPN. Feeding enterally increases secretions, which prevents the fistula from closing and worsens electrolyte imbalances. TPN allows for "bowel rest," reducing fistula output and promoting spontaneous closure. * **Acute Pancreatitis:** While enteral nutrition (via nasojejunal tube) is now preferred in many cases, **severe** acute pancreatitis often requires TPN if the patient cannot tolerate enteral feeds or if there is a prolonged paralytic ileus, as it avoids stimulating pancreatic enzyme secretion. **NEET-PG High-Yield Pearls:** * **Absolute Indication for TPN:** Short bowel syndrome (<100 cm of functional small bowel). * **Most common complication of TPN:** Catheter-related bloodstream infection (CRBSI), usually due to *Staphylococcus aureus* or *Candida*. * **Most common metabolic complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by hypophosphatemia, hypomagnesemia, and hypokalemia when feeding is restarted in malnourished patients.

Q: A patient operated for thyroid surgery for a thyroid swelling later developed difficulty in breathing and neck swelling. What is the immediate management?

Open the wound sutures in the ward. ### Explanation The clinical presentation of respiratory distress and neck swelling immediately following thyroid surgery is a surgical emergency, most commonly caused by a **tension hematoma**. **1. Why Option D is Correct:** The primary pathology is the accumulation of blood deep to the investing layer of deep cervical fascia. This hematoma exerts direct pressure on the trachea and, more importantly, causes **venous and lymphatic obstruction**, leading to rapid laryngeal edema. The immediate priority is to **decompress the neck**. Opening the wound sutures at the bedside (in the ward) instantly relieves the pressure, restores venous drainage, and secures the airway before the patient reaches a state of complete asphyxia. **2. Why Other Options are Incorrect:** * **A. Epinephrine:** This is the treatment for anaphylaxis. While anaphylaxis causes laryngeal edema, it does not present with a tense neck swelling post-surgery. * **B. Tracheostomy:** While it secures the airway, it is time-consuming and technically difficult in a distorted neck with a hematoma. Decompression must precede any surgical airway attempt. * **C. IV Calcium Gluconate:** This is the treatment for hypocalcemia (post-operative tetany). While hypocalcemia can cause laryngospasm, it typically presents 24–72 hours post-op and does not cause neck swelling. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of post-thyroidectomy respiratory distress:** Tension hematoma (usually due to slipping of a ligature on the superior thyroid artery). * **Most common cause of "Stridor" in the recovery room:** Laryngeal edema or bilateral Recurrent Laryngeal Nerve (RLN) injury. * **Management Sequence:** 1. Open sutures at bedside $\rightarrow$ 2. Evacuate clot $\rightarrow$ 3. Return to OR for formal hemostasis. * **Timeframe:** Most hematomas occur within the first 6 hours post-surgery.

Question 1

Which of the following is a prophylactic measure for Deep Vein Thrombosis (DVT)?

Accepted Answer

All of the above

Answer

Warfarin

Answer

Heparin

Answer

Graduated elastic compression stockings

Question 2

Which of the following is true regarding the pre-operative preparation for hysterectomy?

Accepted Answer

The antibiotic dose should be repeated if the surgery is prolonged or associated with excessive bleeding.

Answer

Prophylactic antibiotics should be administered at the time of skin incision.

Answer

Povidone-iodine preparations result in a lower rate of surgical site infections compared to chlorhexidine alcohol-based preparations.

Answer

All patients must be screened for bacterial vaginosis and adequately treated.

Question 3

Thromboembolism after pelvic surgery is usually from which veins?

Accepted Answer

Femoral

Answer

Iliac

Answer

Calf

Answer

Pelvic

Question 4

Paradoxical aciduria is seen in:

Accepted Answer

Pyloric obstruction

Answer

Intestinal obstruction

Answer

Vesico-vaginal fistula

Answer

Enterocutaneous fistula

Question 5

Marie, a 51-year-old woman, is diagnosed with cholecystitis. Which diet, when selected by the client, indicates that the nurse’s teaching has been successful?

Accepted Answer

Low-fat, high-carbohydrate meals

Answer

4-6 small meals of low-carbohydrate foods daily

Answer

High-fat, high-carbohydrate meals

Answer

High-fat, low protein meals

Question 6

Which of the following is NOT an indication for total parenteral nutrition?

Accepted Answer

Chronic liver disease

Answer

Acute pancreatitis

Answer

Enterocolic fistula

Answer

Faecal fistula

Question 7

Which of the following is not typically observed in the postoperative period?

Accepted Answer

Hyponatremia

Answer

Hypothermia

Answer

Hyperkalemia

Answer

Negative nitrogen balance

Question 8

What is the treatment of choice in postoperative adhesive intestinal obstruction?

Accepted Answer

Surgery should be avoided in the initial 72 hours

Answer

Immediate surgery

Answer

Surgery after one week

Answer

None of the above

Question 9

A patient operated for thyroid surgery for a thyroid swelling later developed difficulty in breathing and neck swelling. What is the immediate management?

Accepted Answer

Open the wound sutures in the ward

Answer

Epinephrine injection

Answer

Tracheostomy

Answer

IV calcium gluconate

Question 10

What is true regarding wound dehiscence?

Accepted Answer

The management of wound dehiscence depends on the degree of evisceration and the condition of the bowel.

Answer

If dehiscence is suspected, close with continuous sutures of non-absorbable material.

Answer

Dehiscence typically occurs on the 2nd postoperative day.

Answer

A sudden gush of fluid may precede wound dehiscence.

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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