Preoperative and Postoperative Care Practice Questions

Q: A burst abdomen following laparotomy typically occurs after how many days?

7-10 days. **Explanation:** **Burst Abdomen (Abdominal Wound Dehiscence)** refers to the partial or complete disruption of the layers of a surgical wound. **1. Why 7–10 days is correct:** The integrity of a surgical wound depends on the balance between collagen synthesis and collagen lysis. Between the **7th and 10th postoperative days**, the wound is in its most vulnerable state. At this stage, the initial fibrin glue and sutures have started to weaken or lose their tensile strength, while the newly synthesized collagen has not yet gained sufficient strength to withstand intra-abdominal pressure. This "lag phase" in wound healing is when dehiscence most commonly occurs. **2. Why other options are incorrect:** * **1–2 days:** At this stage, the wound is held firmly by the primary surgical sutures, and the inflammatory phase is just beginning. Dehiscence is rare unless there is a major technical failure. * **3 weeks / One month:** By this time, the proliferative phase is well-advanced, and remodeling has begun. The tensile strength of the wound has increased significantly, making a sudden "burst" unlikely. Late failures usually present as **incisional hernias** rather than acute dehiscence. **Clinical Pearls for NEET-PG:** * **The "Pink Discharge" Sign:** The earliest clinical sign of impending burst abdomen is a **serosanguinous (pinkish) discharge** from the wound, typically occurring on the 5th or 6th day. * **Risk Factors:** Increased intra-abdominal pressure (coughing, vomiting, ascites), malnutrition (hypoalbuminemia), anemia, jaundice, and poor surgical technique (e.g., sutures tied too tightly). * **Management:** Immediate management involves covering the bowel with sterile saline-soaked gauze, followed by urgent surgical closure using **tension-sutures (interrupted internal mass closure)**.

Q: A 65-year-old man has an enterocutaneous fistula originating in the jejunum secondary to inflammatory bowel disease. Which of the following would be the most appropriate fluid for replacement of his enteric losses?

Ringer lactate solution. **Explanation:** The management of an enterocutaneous fistula (ECF) requires precise fluid and electrolyte replacement based on the anatomical site of the loss. **1. Why Ringer Lactate (RL) is correct:** Jejunal secretions are essentially **isotonic** and contain significant amounts of sodium, potassium, and **bicarbonate**. Loss of jejunal fluid typically leads to metabolic acidosis due to the depletion of bicarbonate. Ringer Lactate is the fluid of choice because its electrolyte composition closely mimics that of small bowel secretions. Furthermore, the **lactate** in RL is metabolized by the liver into bicarbonate, which helps counteract the metabolic acidosis associated with high-output upper intestinal fistulae. **2. Why the other options are incorrect:** * **3% Normal Saline:** This is a hypertonic solution used for symptomatic hyponatremia or cerebral edema. Using it here would cause severe hypernatremia and fluid overload. * **0.9% Sodium Chloride (Normal Saline):** While isotonic, NS lacks potassium and bicarbonate. Prolonged replacement with NS can lead to **hyperchloremic metabolic acidosis**, worsening the patient's acid-base status. * **6% Sodium Bicarbonate:** This is an extremely concentrated alkaline solution. Bicarbonate replacement is usually reserved for severe acidosis (pH <7.1) and is not used as a primary maintenance or replacement fluid. **Clinical Pearls for NEET-PG:** * **Gastric losses (Vomiting/NG suction):** Replace with 0.45% NS + KCl (due to loss of HCl, leading to Hypochloremic Hypokalemic Metabolic Alkalosis). * **Small Bowel/Biliary/Pancreatic losses:** Replace with Ringer Lactate (due to loss of HCO3⁻, leading to Metabolic Acidosis). * **The "Rule of Thumb":** Always replace "like with like." Small bowel fluid is alkaline and electrolyte-rich; RL is the most physiological crystalloid for this purpose.

Q: Parenteral nutrition is not indicated in which of the following conditions?

Severe burns. The core principle of nutritional support is: **"If the gut works, use it."** Enteral nutrition (EN) is always preferred over Parenteral Nutrition (PN) because it maintains the gut mucosal barrier, prevents bacterial translocation, and carries a lower risk of infection. ### Why "Severe Burns" is the Correct Answer In **Severe Burns**, the metabolic demand is massive (hypermetabolic state). Current clinical guidelines (ASPEN/ESPEN) strongly emphasize **early enteral nutrition** (within 4–6 hours of injury). EN is superior in burn patients because it reduces the hypermetabolic response, prevents Curling’s ulcers, and significantly lowers the risk of sepsis compared to PN. PN is reserved only as a last resort if the GI tract is non-functional. ### Why the Other Options are Wrong * **Enterocutaneous Fistula (A):** High-output fistulas often require PN to allow "bowel rest," reducing secretions and facilitating spontaneous closure. * **Crohn’s Disease (C):** While EN is used, PN is indicated in patients with severe exacerbations, toxic megacolon, or short bowel syndrome where the inflamed gut cannot absorb nutrients. * **Ileus (D):** Postoperative or paralytic ileus involves a non-functional GI tract. Since the gut is not moving, enteral feeding is impossible, making PN a standard indication. ### High-Yield Clinical Pearls for NEET-PG * **Absolute Indication for PN:** Short bowel syndrome, high-output intestinal fistula, and complete intestinal obstruction. * **Most common complication of PN:** Catheter-related bloodstream infection (Sepsis). * **Most common metabolic complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by **Hypophosphatemia** (most important), hypokalemia, and hypomagnesemia when feeding is restarted in a starved patient.

Q: What is the most common complication following splenectomy?

Left lower lobe atelectasis. **Explanation:** The most common complication following a splenectomy is **Left lower lobe atelectasis**. **Why it occurs:** The spleen is located in the left upper quadrant, immediately beneath the left diaphragm. During surgery, the diaphragm is often irritated or manipulated. Postoperatively, patients experience pain in this region, leading to splinting (shallow breathing) and a reluctance to cough or take deep breaths. This results in the collapse of the small airways in the adjacent lung segment, making left-sided basal atelectasis the most frequent pulmonary complication, typically occurring within the first 24–48 hours. **Analysis of Incorrect Options:** * **Wound dehiscence:** While a potential complication of any abdominal surgery, it is not specific to splenectomy nor as common as pulmonary issues. * **Pneumococcal septicemia (OPSI):** Overwhelming Post-Splenectomy Infection (OPSI) is the most **dreaded** and serious late complication, but it is relatively rare (incidence <1%). *S. pneumoniae* is the most common organism involved. * **Deep vein thrombosis (DVT):** Splenectomy leads to reactive thrombocytosis (elevated platelets), which increases the risk of thromboembolic events like DVT or portal vein thrombosis, but these occur less frequently than immediate postoperative atelectasis. **NEET-PG High-Yield Pearls:** 1. **Most common complication:** Left lower lobe atelectasis. 2. **Most common late/serious complication:** OPSI (Overwhelming Post-Splenectomy Infection). 3. **Vaccination Protocol:** To prevent OPSI, patients should ideally be vaccinated 2 weeks **before** elective surgery or 2 weeks **after** emergency surgery against *S. pneumoniae, H. influenzae,* and *N. meningitidis*. 4. **Hematologic finding:** Presence of **Howell-Jolly bodies** on a peripheral smear is a classic sign of an absent or non-functioning spleen.

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: In which scenario is pneumococcal vaccine most effective?

When given preoperatively. **Explanation:** **Why Option A is correct:** The pneumococcal vaccine (typically PPSV23 or PCV13/20) is most effective when administered **preoperatively**, specifically in patients scheduled for elective **splenectomy**. The spleen plays a critical role in filtering encapsulated bacteria (like *S. pneumoniae*) and producing opsonizing antibodies. To ensure an optimal immune response, the vaccine should be given at least **2 weeks before surgery**. This allows the body to mount a robust antibody titer while the splenic tissue is still functional, providing maximum protection against Post-Splenectomy Sepsis. **Analysis of Incorrect Options:** * **Option B:** While the vaccine can be given postoperatively if the preoperative window is missed, the immune response is often suboptimal and delayed, leaving the patient vulnerable during the immediate recovery phase. * **Option C:** No pneumococcal vaccine covers all strains. PPSV23 covers the 23 most common virulent serotypes, but there are over 90 known serotypes of *Streptococcus pneumoniae*. * **Option D:** *Streptococcus pneumoniae* is a **Gram-positive** coccus. The vaccine has no efficacy against Gram-negative organisms (like *E. coli* or *Pseudomonas*). **High-Yield Clinical Pearls for NEET-PG:** * **The "Big Three" Vaccines for Splenectomy:** Patients must be immunized against **Pneumococcus, Haemophilus influenzae type b (Hib), and Meningococcus**. * **Timing:** If elective, vaccinate ≥2 weeks before; if emergency splenectomy, vaccinate 2 weeks after surgery (to avoid the "stunning" effect on the immune system post-trauma). * **Target Population:** Apart from splenectomy, it is indicated for the elderly (>65 years), those with chronic heart/lung disease, and immunocompromised states (HIV, Nephrotic syndrome). * **Revaccination:** A one-time booster is usually recommended after 5 years for high-risk individuals.

Question 1

A burst abdomen following laparotomy typically occurs after how many days?

Accepted Answer

7-10 days

Answer

1-2 days

Answer

Usually after 3 weeks

Answer

After one month

Question 2

A 65-year-old man has an enterocutaneous fistula originating in the jejunum secondary to inflammatory bowel disease. Which of the following would be the most appropriate fluid for replacement of his enteric losses?

Accepted Answer

Ringer lactate solution

Answer

3% normal saline

Answer

0.9% sodium chloride

Answer

6% sodium bicarbonate solution

Question 3

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 4

Parenteral nutrition is not indicated in which of the following conditions?

Accepted Answer

Severe burns

Answer

Enterocutaneous fistula

Answer

Crohn's disease

Answer

Ileus

Question 5

What is the most common complication following splenectomy?

Accepted Answer

Left lower lobe atelectasis

Answer

Wound dehiscence

Answer

Pneumococcal septicemia

Answer

Deep vein thrombosis

Question 6

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 7

Thromboembolism after pelvic surgery is usually from which veins?

Accepted Answer

Femoral

Answer

Iliac

Answer

Calf

Answer

Pelvic

Question 8

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

Accepted Answer

Hyponatremia

Answer

Hypothermia

Answer

Hyperkalemia

Answer

Negative nitrogen balance

Question 9

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 10

In which scenario is pneumococcal vaccine most effective?

Accepted Answer

When given preoperatively

Answer

When given postoperatively

Answer

Against all strains of pneumococcus

Answer

Against Gram-negative bacteria

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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