Preoperative and Postoperative Care Practice Questions

Q: Postoperative ileus is most commonly seen in which part of the gastrointestinal tract?

Colon. **Explanation:** Postoperative ileus (POI) is a transient impairment of gastrointestinal motility following abdominal surgery. The recovery of motility follows a predictable chronological sequence, and the **colon** is the correct answer because it is the last part of the GI tract to regain normal function. **Why Colon is Correct:** The duration of ileus varies by anatomical segment due to differences in intrinsic myogenic activity and autonomic innervation. While the entire GI tract is affected by the inhibitory sympathetic surge and inflammatory mediators post-surgery, the colon typically takes **48 to 72 hours** to recover. Because it remains quiescent the longest, it is the primary site where postoperative ileus is clinically manifested. **Why Other Options are Incorrect:** * **Stomach:** Gastric motility usually returns within **24 to 48 hours**. While delayed gastric emptying can occur, it is not the most common site for prolonged ileus. * **Ileum (Small Intestine):** The small intestine is the most resilient to surgical trauma, with motility typically returning within **0 to 24 hours** (often as early as 6 hours post-op). * **Duodenum:** Like the rest of the small bowel, the duodenum recovers rapidly and is rarely the cause of persistent postoperative ileus. **NEET-PG High-Yield Pearls:** * **Sequence of Recovery:** Small Intestine (fastest) → Stomach → Colon (slowest). * **Clinical Sign of Resolution:** The passage of flatus and the return of bowel sounds (though flatus is a more reliable indicator of colonic recovery). * **Management:** Early ambulation, use of NSAIDs (to reduce opioid requirements), and "Gum Chewing" (sham feeding) are proven to reduce the duration of POI. * **Electrolytes:** Hypokalemia is a common metabolic factor that exacerbates postoperative ileus.

Q: What is the most common cause of post-operative shock?

Hypokalemia. In the context of surgical recovery, **Hypokalemia** (Option A) is frequently cited in clinical examinations as the most common cause of postoperative shock, specifically due to its role in inducing **paralytic ileus** and significant **fluid sequestration** (third-spacing). ### Why Hypokalemia is Correct Postoperative patients often experience potassium loss through surgical stress (increased aldosterone and cortisol), gastric suctioning, or prolonged IV fluid administration without adequate supplementation. Severe hypokalemia leads to smooth muscle atony, resulting in paralytic ileus. This causes massive amounts of fluid to shift into the "third space" (the bowel lumen), leading to **hypovolemic shock**. In the immediate postoperative period, this fluid shift is the most frequent culprit behind hemodynamic instability. ### Why Other Options are Incorrect * **Cardiogenic (B):** While common in elderly patients with pre-existing heart disease (e.g., perioperative MI), it is not the most common cause across the general surgical population. * **Septic (C):** Sepsis usually manifests later in the postoperative course (typically after 48–72 hours) as wound infections or anastomotic leaks develop. It is rarely the cause of immediate postoperative shock. * **Air Embolism (D):** This is a rare, catastrophic complication usually associated with central venous catheter insertion or specific surgeries (e.g., neurosurgery in the sitting position), but it is not a "common" cause. ### High-Yield Clinical Pearls for NEET-PG * **Most common cause of shock in the first 24 hours:** Hypovolemia (due to hemorrhage or third-space losses). * **Potassium and the Heart:** While hypokalemia causes ileus, its most dangerous complication is cardiac arrhythmias (U-waves on ECG). * **Rule of Thumb:** In any postoperative patient with hypotension and a distended abdomen, always check serum electrolytes and consider third-space loss due to ileus.

Q: What is the most common early post-operative complication of ileostomy?

Necrosis. **Explanation:** The most common **early** (within the first 24–48 hours) complication of an ileostomy is **ischemia and necrosis**. This occurs due to compromise of the mesenteric blood supply during the mobilization of the ileal limb or if the mesenteric opening in the abdominal wall is too tight, leading to venous congestion and subsequent arterial insufficiency. * **Why Necrosis is Correct:** In the immediate postoperative period, the viability of the stoma is the primary concern. If the stoma appears dusky, cyanotic, or black, it indicates necrosis. While minor mucosal sloughing can be managed conservatively, deep necrosis requires urgent surgical revision. **Analysis of Incorrect Options:** * **A. Obstruction:** This is a common complication but usually occurs later due to food bolus impaction, adhesions, or parastomal hernia. * **C. Diarrhea:** High-output stoma (leading to dehydration and electrolyte imbalance) is a significant metabolic complication, but it is generally considered a functional issue rather than the most common early structural complication. * **D. Prolapse:** This is a **late** (chronic) complication, more common in loop transverse colostomies than in ileostomies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common overall complication of ileostomy:** Skin excoriation (peristomal dermatitis) due to the alkaline nature of ileal discharge. * **Most common late complication:** Parastomal hernia. * **Stoma Viability Assessment:** A "test tube" or "glass rod" test can be used to visualize the mucosa below the skin level; if it is pink, the necrosis is superficial. * **Ideal Site:** The ileostomy is typically placed at the **McBurney’s point** (right iliac fossa), passing through the rectus abdominis muscle to prevent prolapse and hernia.

Q: According to the enhanced recovery program in colon surgeries, which of the following is true?

Avoidance of perioperative fluid overload. **Explanation:** The **Enhanced Recovery After Surgery (ERAS)** protocol is a multimodal perioperative care pathway designed to reduce the body's stress response to surgery, maintain physiological function, and accelerate recovery. **Why Option C is Correct:** **Avoidance of perioperative fluid overload** (Goal-Directed Fluid Therapy) is a cornerstone of ERAS. Excessive intravenous fluids lead to interstitial edema, which impairs tissue oxygenation, causes gut swelling (leading to postoperative ileus), and increases the risk of anastomotic breakdown. The goal is to maintain "euvolemia" and avoid both dehydration and fluid overload. **Analysis of Incorrect Options:** * **A. Bowel Preparation:** Routine mechanical bowel preparation (MBP) is no longer recommended for most colonic surgeries. It can cause dehydration and electrolyte imbalances without significantly reducing surgical site infections. * **B. Nil Per Oral (NPO):** ERAS discourages prolonged fasting. Current guidelines allow **clear liquids up to 2 hours** and solids up to 6 hours before anesthesia. Preoperative carbohydrate loading (maltodextrin drinks) is encouraged to reduce insulin resistance. * **D. Opioid Analgesia:** ERAS advocates for **Opioid-sparing analgesia** (Multimodal Analgesia). Opioids are avoided because they cause respiratory depression, nausea, and significantly delay the return of bowel function (postoperative ileus). **High-Yield Clinical Pearls for NEET-PG:** * **Key ERAS components:** Preoperative carbohydrate loading, Mid-thoracic epidural (for open surgery), early mobilization, and **early oral intake** (within 24 hours). * **Alvimopan:** A peripheral mu-opioid receptor antagonist sometimes used in ERAS to accelerate bowel recovery. * The primary goal of ERAS is to reduce **length of hospital stay** and **postoperative complications** without increasing readmission rates.

Q: When should antibiotics be given for surgical prophylaxis?

1 hour before surgery. The goal of surgical antimicrobial prophylaxis (SAP) is to ensure that the **peak serum and tissue concentrations** of the antibiotic exceed the minimum inhibitory concentration (MIC) for the likely pathogens at the exact moment of **skin incision**. ### Why Option A is Correct Administering antibiotics **within 60 minutes before the surgical incision** (ideally at the time of anesthesia induction) allows for optimal tissue distribution. For most commonly used antibiotics (like Cefazolin), this window ensures maximum bactericidal activity during the period of highest contamination risk—the incision and initial dissection. *Note: For antibiotics with longer infusion times or half-lives, such as Vancomycin or Fluoroquinolones, administration should begin within 120 minutes before incision.* ### Why Other Options are Incorrect * **Option B & D (Post-surgery):** Administering antibiotics after the incision has been made or the surgery has ended is ineffective for prophylaxis. By this time, bacteria may have already contaminated the surgical site and established a nidus of infection. * **Option C (2 hours before):** For standard beta-lactams, giving the dose too early (beyond 60 minutes) may result in serum levels falling below the MIC by the time the surgery reaches its critical stages or if the procedure is prolonged. ### NEET-PG High-Yield Pearls 1. **Timing:** The single most important factor in SAP is the timing relative to the incision. 2. **Redosing:** Antibiotics should be redosed if the surgery exceeds two half-lives of the drug or if there is significant blood loss (>1500 mL). 3. **Duration:** In most clean and clean-contaminated cases, a **single preoperative dose** is sufficient. Prophylaxis should generally not exceed 24 hours postoperatively. 4. **Choice of Drug:** First-generation cephalosporins (e.g., Cefazolin) are the gold standard for most procedures due to their coverage against *Staphylococcus aureus*.

Q: A 42-year-old man has had a rocky course for the 3 days following a bowel resection for intestinal perforation due to inflammatory bowel disease. His central venous pressure (CVP) had been 12 to 14 but is now 6, in the face of diminished blood pressure and oliguria. Which of the following is the most likely etiology of his hypotension?

Gram-negative sepsis. **Explanation:** The clinical scenario describes a patient 3 days post-bowel resection for perforation (a high-risk setting for contamination) presenting with a sudden drop in Central Venous Pressure (CVP), hypotension, and oliguria. **1. Why Gram-negative Sepsis is Correct:** In the early stages of **septic shock** (distributive shock), there is massive peripheral vasodilation and an increase in capillary permeability. This leads to "relative hypovolemia" as fluid leaks into the interstitial space (third-spacing). The hallmark is a **decrease in CVP** (due to decreased venous return) accompanied by hypotension. Given the history of intestinal perforation and bowel surgery, Gram-negative bacteria (like *E. coli* or *Bacteroides*) are the most likely culprits. **2. Why the Other Options are Incorrect:** * **Pulmonary Embolism (PE):** PE typically causes obstructive shock. This leads to an **increase in CVP** because the right heart struggles to pump blood against the pulmonary obstruction (Right Heart Strain). * **Hypervolemia:** This would manifest as an **increase in CVP** (usually >15 cm H₂O) along with signs of fluid overload like pulmonary edema or raised JVP. * **Positive-Pressure Ventilation:** While it can decrease venous return, it typically causes a **falsely elevated CVP** reading because the increased intrathoracic pressure is transmitted to the vena cava and right atrium. **Clinical Pearls for NEET-PG:** * **CVP Trends:** Always look at the trend rather than a single value. A falling CVP in a surgical patient suggests fluid loss or distributive shock (sepsis/anaphylaxis). * **Shock Differentiation:** * *Hypovolemic/Distributive:* Low CVP. * *Cardiogenic/Obstructive:* High CVP. * **Sepsis Timeline:** Postoperative sepsis from an anastomotic leak or peritonitis typically manifests between postoperative days 3 and 7.

Question 1

Postoperative ileus is most commonly seen in which part of the gastrointestinal tract?

Accepted Answer

Colon

Answer

Ileum

Answer

Duodenum

Answer

Stomach

Question 2

Which of the following is not a method for providing enteral nutrition?

Accepted Answer

Peripherally inserted central catheter (PICC)

Answer

Percutaneous endoscopic gastrostomy (PEG)

Answer

Sip feeding

Answer

Nasojejunal tube

Question 3

What is the most common cause of post-operative shock?

Accepted Answer

Hypokalemia

Answer

Cardiogenic

Answer

Septic

Answer

Air embolism

Question 4

What is the most common early post-operative complication of ileostomy?

Accepted Answer

Necrosis

Answer

Obstruction

Answer

Diarrhea

Answer

Prolapse

Question 5

A patient undergoes thyroid surgery, following which he develops perioral tingling. Blood calcium is 8.9 meq/L. What is the next step?

Accepted Answer

Administer oral calcium.

Answer

Administer Vitamin D orally.

Answer

Administer intravenous calcium gluconate and perform serial monitoring.

Answer

Wait for calcium to decrease to <7.0 meq/L before taking further action.

Question 6

According to the enhanced recovery program in colon surgeries, which of the following is true?

Accepted Answer

Avoidance of perioperative fluid overload

Answer

Bowel preparation a day prior to surgery

Answer

Nil per oral from the night before surgery

Answer

Opioid analgesia preferred

Question 7

A 65-year-old man undergoes a technically difficult abdominoperineal resection for a rectal cancer during which he receives three units of packed red blood cells. Four hours later in the intensive care unit he is bleeding heavily from his perineal wound. Emergency coagulation studies reveal normal prothrombin, partial thromboplastin, and bleeding times. The fibrin degradation products are not elevated but the serum fibrinogen content is depressed and the platelet count is 70,000/mL. What is the most likely cause of the bleeding?

Accepted Answer

A bleeding blood vessel in the surgical field

Answer

Delayed blood transfusion reaction

Answer

Autoimmune fibrinolysis

Answer

Factor VIII deficiency

Question 8

When should antibiotics be given for surgical prophylaxis?

Accepted Answer

1 hour before surgery

Answer

1 hour after surgery

Answer

2 hours before surgery

Answer

2 hours after surgery

Question 9

After thyroidectomy, on the 2nd postoperative day, an elderly lady developed dyspnea with swelling of the neck. What is the next best step of management?

Accepted Answer

Shift to OT immediately

Answer

Release 2-3 stitches over the skin

Answer

Prepare for intubation and mechanical ventilation

Answer

Wait and watch

Question 10

A 42-year-old man has had a rocky course for the 3 days following a bowel resection for intestinal perforation due to inflammatory bowel disease. His central venous pressure (CVP) had been 12 to 14 but is now 6, in the face of diminished blood pressure and oliguria. Which of the following is the most likely etiology of his hypotension?

Accepted Answer

Gram-negative sepsis

Answer

Pulmonary embolism

Answer

Hypervolemia

Answer

Positive-pressure ventilation

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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