Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 31: Which of the following is a prophylactic measure for Deep Vein Thrombosis (DVT)?

A. Warfarin
B. Heparin
C. Graduated elastic compression stockings
D. All of the above (Correct Answer)

Explanation: **Explanation:** Deep Vein Thrombosis (DVT) prophylaxis is a critical component of perioperative care, aimed at preventing the triad of stasis, hypercoagulability, and endothelial injury (Virchow’s Triad). Prophylactic measures are broadly categorized into **Mechanical** and **Pharmacological** methods. 1. **Mechanical Prophylaxis:** **Graduated elastic compression stockings (GCS)** and Intermittent Pneumatic Compression (IPC) devices work by increasing the velocity of venous blood flow and preventing venous stasis. These are ideal for patients with a high risk of bleeding. 2. **Pharmacological Prophylaxis:** * **Heparin:** Low-dose Unfractionated Heparin (UFH) or Low Molecular Weight Heparin (LMWH) like Enoxaparin are the gold standards for perioperative prophylaxis. They inhibit clotting factors (Xa and IIa) to prevent thrombus formation. * **Warfarin:** While less common in the immediate acute surgical setting due to its delayed onset and monitoring requirements, it is a recognized prophylactic agent, particularly in high-risk orthopedic surgeries (e.g., total hip replacement). **Why "All of the above" is correct:** All three options are established methods for reducing DVT risk. In clinical practice, a combination of mechanical (Stockings) and pharmacological (Heparin/Warfarin) methods is often superior to either alone for high-risk patients. **High-Yield Clinical Pearls for NEET-PG:** * **LMWH vs. UFH:** LMWH is preferred over UFH due to a longer half-life, more predictable bioavailability, and lower risk of Heparin-Induced Thrombocytopenia (HIT). * **Gold Standard for Diagnosis:** The investigation of choice for DVT is **Duplex Ultrasonography**, but the "Gold Standard" remains **Contrast Venography**. * **Caprini Score:** This is the most commonly used risk assessment tool to determine the type and duration of DVT prophylaxis required for surgical patients. * **Timing:** Pharmacological prophylaxis is typically started 2–12 hours preoperatively or postoperatively, depending on the surgery type and bleeding risk.

Question 32: Which of the following is true regarding the pre-operative preparation for hysterectomy?

A. Prophylactic antibiotics should be administered at the time of skin incision.
B. The antibiotic dose should be repeated if the surgery is prolonged or associated with excessive bleeding. (Correct Answer)
C. Povidone-iodine preparations result in a lower rate of surgical site infections compared to chlorhexidine alcohol-based preparations.
D. All patients must be screened for bacterial vaginosis and adequately treated.

Explanation: ### Explanation **1. Why Option B is Correct:** The primary goal of surgical antimicrobial prophylaxis (SAP) is to maintain therapeutic tissue levels of the antibiotic throughout the duration of the procedure. According to standard guidelines (e.g., CDC and SCIP), a repeat dose of the prophylactic antibiotic is indicated if: * The procedure duration exceeds **two half-lives** of the drug (e.g., after 3–4 hours for Cefazolin). * There is **excessive blood loss** (usually >1500 mL), which leads to the dilution and loss of the drug from the intravascular and interstitial compartments. **2. Why the Other Options are Incorrect:** * **Option A:** Prophylactic antibiotics should be administered **within 60 minutes prior** to the skin incision (ideally 15–60 mins) to ensure peak tissue concentration at the time of incision. Administering them *at the time* of incision is often too late to achieve optimal tissue levels. * **Option C:** Current evidence and guidelines (e.g., WHO) suggest that **Chlorhexidine-alcohol-based** preparations are superior to Povidone-iodine in reducing Surgical Site Infections (SSIs) because chlorhexidine has a more rapid onset and persistent residual activity. * **Option D:** While bacterial vaginosis (BV) is associated with an increased risk of post-hysterectomy cuff cellulitis, **universal screening is not mandatory** for all patients. It is generally recommended only for high-risk patients or symptomatic individuals. **3. High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** A first-generation cephalosporin (**Cefazolin**) is the most common agent for hysterectomy. * **Timing:** Vancomycin or Fluoroquinolones (if used) should be started within **120 minutes** before incision due to longer infusion times. * **Duration:** For most clean-contaminated surgeries like hysterectomy, a **single preoperative dose** is sufficient. Postoperative doses beyond 24 hours do not reduce SSI risk and contribute to resistance. * **Hair Removal:** If necessary, hair should be removed using **electric clippers** immediately before surgery; shaving with a razor is contraindicated as it increases SSI risk via micro-abrasions.

Question 33: Thromboembolism after pelvic surgery is usually from which veins?

A. Iliac
B. Calf
C. Femoral (Correct Answer)
D. Pelvic

Explanation: **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).

Question 34: Paradoxical aciduria is seen in:

A. Intestinal obstruction
B. Vesico-vaginal fistula
C. Pyloric obstruction (Correct Answer)
D. Enterocutaneous fistula

Explanation: **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).

Question 35: 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?

A. 4-6 small meals of low-carbohydrate foods daily
B. High-fat, high-carbohydrate meals
C. Low-fat, high-carbohydrate meals (Correct Answer)
D. High-fat, low protein meals

Explanation: **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.

Question 36: Which of the following is NOT an indication for total parenteral nutrition?

A. Acute pancreatitis
B. Enterocolic fistula
C. Chronic liver disease (Correct Answer)
D. Faecal fistula

Explanation: **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.

Question 37: Which of the following is not typically observed in the postoperative period?

A. Hyponatremia (Correct Answer)
B. Hypothermia
C. Hyperkalemia
D. Negative nitrogen balance

Explanation: **Explanation:** The metabolic response to surgery and trauma is characterized by a complex neuroendocrine reflex designed to maintain homeostasis and provide energy for healing. **Why Hyponatremia is the Correct Answer:** In the immediate postoperative period, the body typically exhibits **sodium retention**, not hyponatremia. The stress of surgery triggers the release of **Aldosterone** (via the Renin-Angiotensin-Aldosterone System) and **ACTH**, which act on the kidneys to conserve sodium and water to maintain intravascular volume. While ADH (Vasopressin) is also elevated—which can cause water retention—the primary physiological drive is the conservation of sodium. Therefore, hyponatremia is not a "typical" or physiological expectation; if it occurs, it is usually iatrogenic (e.g., over-administration of hypotonic fluids). **Analysis of Incorrect Options:** * **Hypothermia:** Common due to the cold operating room environment, anesthetic-induced vasodilation, and exposure of body cavities. * **Hyperkalemia:** Tissue trauma, cell lysis, and the catabolic state lead to the release of intracellular potassium into the extracellular space. Additionally, transient acidosis can shift K+ out of cells. * **Negative Nitrogen Balance:** Surgery induces a **catabolic state**. Increased cortisol and catecholamines lead to protein breakdown (proteolysis) to provide amino acids for gluconeogenesis and acute-phase protein synthesis, resulting in more nitrogen being excreted than ingested. **High-Yield Clinical Pearls for NEET-PG:** * **Phase of Injury:** The initial "Ebb phase" (decreased BMR) is followed by the "Flow phase" (increased BMR and catabolism). * **Hormonal Profile:** Post-op sees an **increase** in Cortisol, Glucagon, Growth Hormone, and Catecholamines, but a **decrease** in Insulin sensitivity (stress-induced hyperglycemia). * **Water/Sodium:** The body enters a state of "obligatory oliguria" post-surgery due to high ADH and Aldosterone levels.

Question 38: What is the treatment of choice in postoperative adhesive intestinal obstruction?

A. Immediate surgery
B. Surgery after one week
C. Surgery should be avoided in the initial 72 hours (Correct Answer)
D. None of the above

Explanation: ### Explanation **1. Why Option C is Correct:** Postoperative adhesive intestinal obstruction is most commonly caused by **fibrinous adhesions** (early) or **fibrous bands** (late). In the early postoperative period (within 4 weeks), the majority of these obstructions are partial and resolve spontaneously as the inflammatory process subsides. The standard of care is **conservative management** (Drip and Suck method: NPO, IV fluids, and nasogastric decompression). Clinical studies show that approximately 80% of these cases resolve within **48 to 72 hours**. Operating during this acute inflammatory phase is technically difficult due to "friable" bowel loops, increasing the risk of accidental enterotomies and further adhesion formation. Therefore, surgery is generally avoided in the initial 72 hours unless signs of strangulation appear. **2. Why Other Options are Incorrect:** * **Option A (Immediate surgery):** This is contraindicated in simple adhesive obstruction because it increases morbidity. Surgery is only "immediate" if there are signs of **strangulation** (fever, tachycardia, localized tenderness, or leukocytosis). * **Option B (Surgery after one week):** Waiting a full week is arbitrary. If the patient does not show clinical or radiological improvement (e.g., passage of flatus or reduction in bowel diameter) within 48–72 hours, surgical intervention is then considered. **3. Clinical Pearls for NEET-PG:** * **Most common cause** of Small Bowel Obstruction (SBO) in developed countries: **Postoperative Adhesions.** * **Gastrografin Challenge:** A water-soluble contrast study that is both diagnostic and therapeutic; if contrast reaches the colon within 24 hours, it predicts the resolution of the obstruction. * **Indications for Surgery:** Persistent obstruction >72 hours, complete obstruction, or suspected **strangulation** (the most critical contraindication to conservative management). * **Noble’s Plication** and **Charles-Phillips operation** are historical surgical techniques used to prevent recurrent adhesions by suturing bowel loops in an orderly fashion.

Question 39: A patient operated for thyroid surgery for a thyroid swelling later developed difficulty in breathing and neck swelling. What is the immediate management?

A. Epinephrine injection
B. Tracheostomy
C. IV calcium gluconate
D. Open the wound sutures in the ward (Correct Answer)

Explanation: ### 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 40: What is true regarding wound dehiscence?

A. If dehiscence is suspected, close with continuous sutures of non-absorbable material.
B. Dehiscence typically occurs on the 2nd postoperative day.
C. The management of wound dehiscence depends on the degree of evisceration and the condition of the bowel. (Correct Answer)
D. A sudden gush of fluid may precede wound dehiscence.

Explanation: **Explanation:** Wound dehiscence (burst abdomen) is a serious postoperative complication involving the partial or complete disruption of abdominal wound layers. **Why Option C is Correct:** The management of dehiscence is not "one size fits all." It is tailored to the patient's clinical status. If there is minor dehiscence without evisceration, conservative management with binders may be considered. However, if **evisceration** (protrusion of viscera) occurs, the condition of the bowel (ischemia, perforation, or contamination) dictates whether a simple reclosure, a temporary bogota bag, or a formal laparotomy is required. **Analysis of Incorrect Options:** * **Option A:** If dehiscence occurs and surgical closure is required, the standard of care is **interrupted, deep tension sutures** (often using heavy non-absorbable material like Nylon or Prolene) rather than continuous sutures, to ensure secure closure despite high intra-abdominal pressure. * **Option B:** Dehiscence typically occurs between the **5th and 8th postoperative day**, not the 2nd. The 2nd day is too early for the mechanical failure of healing tissues usually seen in burst abdomen. * **Option D:** While a sudden gush of **serosanguinous (pinkish) fluid** is a classic warning sign, the option is technically "less correct" than C because the question asks for what is true regarding the *nature* of the condition. (Note: In many exams, D is considered a clinical feature, but C defines the surgical management principle). **NEET-PG High-Yield Pearls:** * **Classic Sign:** "Pink toothbrush" sign or serosanguinous discharge from the wound. * **Risk Factors:** Malnutrition (hypoalbuminemia), anemia, jaundice, malignancy, and increased intra-abdominal pressure (coughing, ileus). * **Immediate Management:** Cover the protruded bowel with **sterile saline-soaked gauze** and prepare for urgent surgical intervention. * **Technical Error:** The most common cause of dehiscence is poor surgical technique (e.g., sutures placed too close to the edge or too tight).

Practice by Chapter

Preoperative Risk Assessment

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Perioperative Management of Comorbidities

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Preparation of Patient for Surgery

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Informed Consent Process

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Post-Anesthesia Care

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Pain Management

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Wound Care and Dressings

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Drain Management

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Postoperative Complications Detection

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Early Ambulation and Rehabilitation

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Enhanced Recovery After Surgery (ERAS) Protocols

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Discharge Planning and Follow-up

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