Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 131: What is a contraindication for major thoracic surgery?

A. Recent myocardial infarction within 3 months (Correct Answer)
B. Recent myocardial infarction within 9 months
C. Recent myocardial infarction within 12 months
D. Recent myocardial infarction within 18 months

Explanation: **Explanation:** The preoperative assessment of cardiac risk is critical in major thoracic surgery, as these procedures involve significant physiological stress, fluid shifts, and potential hypoxia. **Why Option A is correct:** A recent myocardial infarction (MI) is a major predictor of perioperative cardiovascular events. According to standard surgical guidelines (including ACC/AHA), the risk of re-infarction is highest in the first few months following an ischemic event. Specifically, surgery performed within **3 months** of an MI carries an unacceptably high risk of perioperative mortality and morbidity. While some modern guidelines suggest waiting 60 days for non-cardiac surgery if the patient has been revascularized, for the purpose of competitive exams like NEET-PG, **3 months** remains the classic threshold for a "recent" MI acting as a relative/absolute contraindication for elective major surgery. **Why Options B, C, and D are incorrect:** While a history of MI always necessitates a thorough cardiac workup, the risk stabilizes significantly after 6 months. * **9, 12, and 18 months** are outside the high-risk "acute" or "recent" window. By these time points, if the patient is asymptomatic and has good functional capacity (METS >4), surgery is generally considered safe to proceed with appropriate monitoring. **High-Yield Clinical Pearls for NEET-PG:** * **Goldman’s Index:** A recent MI (within 6 months) is one of the highest-weighted criteria in the original Cardiac Risk Index. * **Functional Capacity:** The ability to perform **4 METS** (climbing two flights of stairs) is a strong predictor of good surgical outcomes. * **Thoracic Specifics:** For lung resection, a **Postoperative Predicted FEV1 <30%** or a **DLCO <30%** are also major contraindications. * **Wait Times:** If a bare-metal stent was placed, wait 1 month; if a drug-eluting stent (DES) was placed, wait 6 months before elective non-cardiac surgery.

Question 132: Which of the following is NOT true regarding early postcibal syndrome?

A. Distention of the abdomen
B. Managed conservatively
C. Hypermotility of the intestine is common
D. Surgery is usually indicated (Correct Answer)

Explanation: **Explanation:** Early postcibal syndrome (Early Dumping Syndrome) occurs in 5–10% of patients after gastric surgeries like Billroth I/II or Roux-en-Y gastric bypass. It is primarily a **physiological and vasomotor response** rather than a structural surgical failure. **1. Why "Surgery is usually indicated" is NOT true:** The mainstay of management for early dumping syndrome is **conservative medical therapy**. Over 80–90% of patients respond to dietary modifications (small frequent meals, high protein/low carbohydrate diet, and avoiding liquids during meals). Pharmacotherapy with **Octreotide** (somatostatin analogue) is the next step for refractory cases. Surgery is considered a **last resort** and is rarely indicated, as it often yields unpredictable results. **2. Analysis of other options:** * **Distention of the abdomen:** Rapid emptying of hypertonic chyme into the small intestine causes an osmotic shift of fluid from the intravascular space into the lumen. This leads to acute intestinal distention and symptoms like bloating and cramping. * **Managed conservatively:** As mentioned, dietary changes are the first-line treatment. Most patients experience spontaneous improvement as the small bowel adapts over time. * **Hypermotility of the intestine:** The release of gastrointestinal hormones (like serotonin, neurotensin, and enteroglucagon) due to rapid gastric emptying triggers increased intestinal motility, leading to colicky pain and explosive diarrhea. **Clinical Pearls for NEET-PG:** * **Timing:** Early dumping occurs **15–30 minutes** after a meal; Late dumping occurs **1–3 hours** later (due to reactive hypoglycemia). * **Pathophysiology:** Early dumping is **osmotic/vasomotor**; Late dumping is **insulin-mediated**. * **Sigstad’s Score:** Used clinically to diagnose dumping syndrome based on symptoms. * **Diagnostic Test:** The **Provocative Glucose Challenge Test** is the gold standard.

Question 133: A complication in the first 48 hours of total parenteral nutrition is?

A. Hypernatremia
B. Hyperkalemia
C. Hyperglycemia (Correct Answer)
D. Selenium deficiency

Explanation: **Explanation:** **Hyperglycemia** is the most common metabolic complication occurring in the early phase (first 48 hours) of Total Parenteral Nutrition (TPN). This occurs because TPN solutions contain high concentrations of dextrose. When infused rapidly or in patients with underlying stress (which induces insulin resistance), the pancreas may fail to secrete sufficient insulin to maintain glucose homeostasis. If left unmanaged, this can lead to osmotic diuresis and hyperosmolar non-ketotic coma. **Analysis of Options:** * **Hypernatremia (A) & Hyperkalemia (B):** While electrolyte imbalances can occur, they are typically a result of improper formulation or underlying renal issues rather than an inherent early complication of standard TPN initiation. In fact, **Hypokalemia** is more common during the early phase as part of "Refeeding Syndrome," where insulin drives potassium into the cells. * **Selenium Deficiency (D):** This is a **late complication** of TPN. Trace element deficiencies (like Selenium, Zinc, or Copper) and vitamin deficiencies usually manifest only after several weeks or months of long-term parenteral nutrition without adequate supplementation. **Clinical Pearls for NEET-PG:** * **Refeeding Syndrome:** Characterized by Hypophosphatemia (most common), Hypomagnesemia, and Hypokalemia. It occurs when nutrition is reintroduced to a severely malnourished patient. * **Most common late complication:** Hepatobiliary dysfunction (e.g., cholestasis, steatosis, or gallstones due to gallbladder stasis). * **Most common infectious complication:** Catheter-related bloodstream infection (CRBSI), often caused by *Staphylococcus aureus* or *Coagulase-negative Staphylococci*. * **Monitoring:** Blood glucose should be monitored every 6 hours during the initial 48 hours of TPN.

Question 134: What is the commonest cause of water intoxication in a surgical patient?

A. Colorectal wash with plain water
B. Syndrome of inappropriate secretion of ADH
C. Irrigation during transurethral resection of the prostate
D. Excessive infusion of 5% glucose (Correct Answer)

Explanation: **Explanation:** **Why 5% Glucose is the Correct Answer:** The most common cause of water intoxication (dilutional hyponatremia) in surgical patients is the **excessive administration of hypotonic fluids**, specifically 5% Dextrose (Glucose). Once infused, the glucose is rapidly metabolized by the body, leaving behind "free water." In the postoperative period, surgical stress triggers a physiological release of **Antidiuretic Hormone (ADH)**. This prevents the kidneys from excreting excess water, leading to hemodilution, a drop in serum sodium levels, and subsequent cellular edema (water intoxication). **Analysis of Incorrect Options:** * **Colorectal wash with plain water:** While this can theoretically cause water absorption through the bowel mucosa, it is an uncommon practice today and rarely leads to systemic intoxication compared to IV fluids. * **SIADH:** Though SIADH causes water retention, in a surgical context, the "transient" elevation of ADH due to pain and stress is a physiological response rather than the pathological syndrome itself. * **Irrigation during TURP:** This causes "TURP Syndrome" due to the absorption of glycine or sorbitol. While it involves water intoxication, it is procedure-specific and not the *most common* cause across general surgical patients. **High-Yield Clinical Pearls for NEET-PG:** * **Early signs:** Headache, confusion, and nausea (due to cerebral edema). * **Late signs:** Seizures, coma, and papilledema. * **Management:** Restriction of free water. In symptomatic cases, cautious use of hypertonic (3%) saline is indicated. * **Gold Standard:** Always monitor urine output and serum electrolytes in patients receiving prolonged hypotonic infusions postoperatively.

Question 135: All of the following are early complications arising after appendicectomy for acute appendicitis except?

A. Ileus
B. Sterility (Correct Answer)
C. Intestinal obstruction
D. Pulmonary complications

Explanation: **Explanation:** The distinction between **early** and **late** postoperative complications is a high-yield concept in surgical exams. Early complications typically occur within the first few days to weeks, whereas late complications manifest months or years later. **Why Sterility is the Correct Answer:** Sterility (specifically in females due to tubal factor infertility) is a **late complication**. It occurs if a perforated appendix leads to pelvic inflammatory disease or extensive adhesions that obstruct the fallopian tubes. Since it takes a significant amount of time for these adhesions to form and for infertility to be clinically identified, it is never classified as an "early" complication. **Analysis of Incorrect Options (Early Complications):** * **Ileus (Option A):** Postoperative paralytic ileus is a common **early** complication (usually within 24–72 hours) due to peritoneal irritation and surgical handling of the bowel. * **Intestinal Obstruction (Option C):** While late obstruction is caused by adhesions, **early** mechanical obstruction can occur due to kinking of a bowel loop, a localized abscess, or a "phlegmon" shortly after surgery. * **Pulmonary Complications (Option D):** Atelectasis and pneumonia are classic **early** complications, often occurring within the first 48 hours due to anesthesia effects and pain-induced shallow breathing. **Clinical Pearls for NEET-PG:** * **Most common early complication:** Wound infection (usually appears on day 5–7). * **Most common cause of late obstruction:** Post-surgical adhesions. * **Pelvic Abscess:** Suspect this if a patient develops a swinging fever and diarrhea on the 5th–10th postoperative day. * **Fecal Fistula:** A rare early complication if the appendiceal stump leaks or the cecal wall was friable.

Question 136: What is the treatment of choice for postoperative lung collapse?

A. Needle drainage
B. Corticosteroids
C. Pulmonary resection
D. Endoscopic suction (Correct Answer)

Explanation: **Explanation:** Postoperative lung collapse, or **atelectasis**, is the most common respiratory complication following surgery, particularly abdominal and thoracic procedures. It is primarily caused by the accumulation of thick tracheobronchial secretions (mucus plugs) that obstruct the airways, leading to the resorption of distal alveolar air. **Why Endoscopic Suction is the Treatment of Choice:** When conservative measures (such as chest physiotherapy, incentive spirometry, and coughing) fail to clear the obstructing mucus plug, **Endoscopic Suction (via Fiberoptic Bronchoscopy)** is the definitive treatment. It allows for direct visualization and mechanical removal of the secretions, facilitating immediate re-expansion of the collapsed lung segment. **Analysis of Incorrect Options:** * **A. Needle drainage:** This is the treatment for tension pneumothorax or pleural effusion, not for alveolar collapse caused by airway obstruction. * **B. Corticosteroids:** These are used to reduce airway inflammation (e.g., in asthma or aspiration pneumonitis) but do not address the mechanical obstruction of a mucus plug. * **C. Pulmonary resection:** This is a radical surgical procedure (removing a lobe or lung) used for malignancy or chronic bronchiectasis; it is never indicated for a reversible condition like postoperative atelectasis. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Postoperative atelectasis typically occurs within the first **24–48 hours** after surgery. * **Clinical Sign:** It is the most common cause of **fever** in the first 24 hours post-op. * **Prevention:** The most effective preventive measure is **early mobilization** and preoperative smoking cessation (at least 8 weeks prior). * **Radiology:** Look for "shift of mediastinum toward the side of collapse" and "elevation of the ipsilateral diaphragm" on a chest X-ray.

Question 137: Among patients who require nutritional resuscitation in an intensive care unit, what is the best indicator that nutritional support is adequate?

A. Urinary nitrogen excretion levels
B. Total serum protein level
C. Serum albumin level (Correct Answer)
D. Serum transferrin levels

Explanation: ### Explanation **Correct Answer: C. Serum albumin level** In the context of nutritional resuscitation, the goal is to reverse a state of negative nitrogen balance and protein-energy malnutrition. **Serum albumin** is considered the most reliable long-term indicator of nutritional status and the adequacy of support in clinical practice. While it has a long half-life (approx. 20 days), a steady rise in albumin levels indicates that the body has transitioned from a catabolic state to an anabolic state, reflecting adequate protein synthesis and caloric intake. **Why other options are incorrect:** * **A. Urinary nitrogen excretion levels:** This measures nitrogen balance (catabolism vs. anabolism) but does not directly indicate if the *nutritional support* provided is being effectively utilized for tissue repair and protein synthesis. It is more of a measure of metabolic stress. * **B. Total serum protein level:** This is a non-specific measure. It includes globulins (which rise during infection/inflammation), making it an unreliable marker for nutritional adequacy. * **D. Serum transferrin levels:** Transferrin has a shorter half-life (8–10 days) than albumin, making it more sensitive to acute changes. However, its levels are heavily influenced by iron stores and liver function, making it less specific than albumin for overall nutritional adequacy in ICU settings. **High-Yield Clinical Pearls for NEET-PG:** * **Pre-albumin (Transthyretin):** Often considered the *best* marker for **acute** changes in nutritional status due to its very short half-life (2 days). If "Pre-albumin" were an option, it would be the preferred choice for monitoring short-term response. * **Albumin Half-life:** 18–20 days. * **Transferrin Half-life:** 8–10 days. * **Retinol-binding protein:** Shortest half-life (12 hours) but rarely used clinically due to cost and complexity. * **Negative Acute Phase Reactants:** Albumin, Pre-albumin, and Transferrin levels *decrease* during acute inflammation/sepsis regardless of nutrition, which is a common confounder in ICU patients.

Question 138: What is the most common metabolic complication of blood transfusion?

A. Hyperkalemia
B. Hypercalcemia
C. Metabolic alkalosis (Correct Answer)
D. Increased 2, 3 DPG

Explanation: **Explanation:** The correct answer is **Metabolic alkalosis**. **Why it is the correct answer:** The primary reason for metabolic alkalosis following blood transfusion is the metabolism of **sodium citrate**, which is used as an anticoagulant in stored blood. Once transfused, the liver metabolizes each molecule of citrate into three molecules of **bicarbonate (HCO₃⁻)**. In massive transfusions or when the patient has stable hepatic function, this accumulation of bicarbonate leads to a rise in blood pH, resulting in metabolic alkalosis. This is the most frequently encountered metabolic derangement in clinical practice following transfusion. **Why the other options are incorrect:** * **Hyperkalemia:** While potassium levels increase in stored blood due to RBC lysis (the "storage lesion"), clinically significant hyperkalemia is rare unless the transfusion is massive, rapid, or the patient has pre-existing renal failure. * **Hypercalcemia:** This is incorrect. Citrate binds to ionized calcium, which actually leads to **hypocalcemia** (citrate toxicity), not hypercalcemia. * **Increased 2,3-DPG:** Stored blood actually undergoes a **decrease** in 2,3-DPG levels. This causes a leftward shift of the oxygen-dissociation curve, meaning hemoglobin holds onto oxygen more tightly, potentially impairing tissue oxygen delivery. **NEET-PG High-Yield Pearls:** * **Most common metabolic abnormality:** Metabolic alkalosis. * **Most common electrolyte abnormality:** Hypocalcemia (due to citrate binding). * **Acid-base shift:** Stored blood is initially acidic (due to citric acid and lactate), but the body’s compensatory metabolism results in a net alkalosis. * **Hypothermia:** A common non-metabolic complication of rapid, cold blood transfusion; always use blood warmers in massive transfusions.

Question 139: A cirrhotic patient with abnormal coagulation studies due to hepatic synthetic dysfunction requires an urgent cholecystectomy. A transfusion of Fresh Frozen Plasma (FFP) is planned to minimize the risk of bleeding due to surgery. What is the optimal timing of this transfusion?

A. The day before surgery
B. The night before surgery
C. On call to surgery (Correct Answer)
D. Intraoperatively

Explanation: **Explanation:** The correct timing for Fresh Frozen Plasma (FFP) transfusion in a patient with coagulopathy undergoing surgery is **"On call to surgery"** (immediately before the procedure). **1. Why "On call to surgery" is correct:** The primary rationale is the **short half-life of Factor VII**, which is approximately **4 to 6 hours**. Factor VII is the most labile of the vitamin K-dependent clotting factors. If FFP is administered too early, the concentration of Factor VII will drop below therapeutic levels by the time the surgeon makes the first incision, rendering the transfusion ineffective for intraoperative hemostasis. Administering it "on call" ensures peak levels of all clotting factors during the most critical period of the procedure. **2. Why other options are incorrect:** * **The day/night before surgery (A & B):** Due to the short half-life of Factor VII, the procoagulant effect will have completely dissipated by the next morning. This leads to unnecessary volume overload without any surgical benefit. * **Intraoperatively (D):** While FFP can be given during surgery if bleeding occurs, the goal of *preoperative* optimization is to prevent the initial "surgical bleed." Waiting until the surgery has started may lead to avoidable blood loss during the initial dissection. **Clinical Pearls for NEET-PG:** * **Indication:** FFP is indicated when the Prothrombin Time (PT) or INR is >1.5 times the control. * **Dosage:** The standard dose is **10–15 mL/kg**. * **Contents:** FFP contains all coagulation factors, fibrinogen, antithrombin III, protein C, and protein S. * **High-Yield Fact:** For rapid reversal of Warfarin (emergency surgery), **Prothrombin Complex Concentrate (PCC)** is preferred over FFP as it works faster and avoids volume overload.

Question 140: Total parenteral nutrition (TPN) may be complicated by which of the following?

A. Obstructive jaundice
B. Hyperosteosis
C. Hypercalcemia (Correct Answer)
D. Pancreatitis

Explanation: **Explanation:** Total Parenteral Nutrition (TPN) is a life-saving intervention but is associated with several metabolic and mechanical complications. **Why Hypercalcemia is the Correct Answer:** Metabolic bone disease is a recognized complication of long-term TPN. **Hypercalcemia** occurs primarily due to the excessive administration of calcium in the TPN solution, excessive Vitamin D supplementation, or as a result of increased bone resorption. Additionally, TPN-induced metabolic acidosis can lead to the leaching of calcium from bones into the serum. High protein loads in TPN also increase urinary calcium excretion, further disrupting calcium homeostasis. **Analysis of Incorrect Options:** * **A. Obstructive Jaundice:** While TPN frequently causes **Hepatobiliary dysfunction** (steatosis, cholestasis, and cholelithiasis/sludge due to lack of enteral stimulation), it typically presents as **intrahepatic cholestasis** rather than classic "obstructive" jaundice (which implies a mechanical block in the extrahepatic ducts). * **B. Hyperosteosis:** TPN is actually associated with **Osteomalacia or Osteoporosis** (TPN Bone Disease), characterized by a decrease in bone density, not hyperosteosis (excessive bone growth). * **D. Pancreatitis:** While TPN can cause hypertriglyceridemia (which is a risk factor for pancreatitis), TPN itself is not a direct or common cause of pancreatitis. In fact, TPN is often used to provide "pancreatic rest" in severe acute pancreatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common metabolic complication:** Hyperglycemia. * **Most common electrolyte abnormality:** Hypokalemia and Hypophosphatemia (especially in **Refeeding Syndrome**). * **Hepatobiliary:** Cholelithiasis is common due to gallbladder stasis (lack of CCK release). * **Deficiency:** Zinc deficiency (perioral dermatitis, alopecia) and Essential Fatty Acid Deficiency (EFAD) are high-yield TPN-related boards topics.

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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