Preoperative and Postoperative Care — MCQs

A 67-year-old male weighing 60 kg, with a history of perforated diverticulitis requiring emergency laparotomy and sigmoid resection, has been in the ICU for a week. His serum albumin is 1.1 g/dL, and he was recently weaned from mechanical ventilation. The patient's colostomy is not functioning. Total parenteral nutrition (TPN) was initiated to provide 1800 kcal/24 h. Two days later, the patient develops respiratory distress necessitating reintubation and mechanical ventilation. Which serum electrolyte level should be checked?

Q145Easy

What is the most common coagulopathy noted in surgical patients?

Q146Medium

Which of the following are contraindications for enteral nutrition?

Q147Medium

A 75-year-old man with a history of myocardial infarction 2 years ago, peripheral vascular disease with symptoms of claudication after walking half a block, hypertension, and diabetes presents with a large ventral hernia. He wishes to have the hernia repaired. Which of the following is the most appropriate next step in his preoperative workup?

Q148Medium

A 66-year-old female is scheduled for subtotal gastrectomy for adenocarcinoma. What is an important procedure-related complication?

Q149Medium

Which of the following agents is of no value in the postoperative care of a hemophilic patient?

Q150Easy

Hyponatremia in multiple myeloma is considered:

Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs

Question 141: Which of the following is NOT a complication of massive blood transfusion?

A. Septicemia
B. Thrombocytopenia
C. Hyperthermia (Correct Answer)
D. ARDS

Explanation: ### Explanation **Massive Blood Transfusion (MBT)** is defined as the replacement of >10 units of PRBCs in 24 hours or 1 blood volume in 24 hours. **Why Hyperthermia is the Correct Answer:** Massive transfusion typically leads to **Hypothermia**, not hyperthermia. This occurs because stored blood is kept at 4°C. Rapid infusion of large volumes of cold blood overrides the body’s thermoregulatory mechanisms, shifting the oxyhemoglobin dissociation curve to the left and potentially causing cardiac arrhythmias. **Analysis of Incorrect Options:** * **Septicemia:** Every unit of blood carries a risk of bacterial contamination (more common in platelets due to room temperature storage). In MBT, the sheer volume and multiple donors significantly increase the cumulative risk of transfusion-transmitted infections and sepsis. * **Thrombocytopenia:** Stored whole blood or PRBCs are deficient in viable platelets and clotting factors (V and VIII). Large-scale replacement with deficient blood leads to **dilutional thrombocytopenia** and coagulopathy. * **ARDS:** This can occur as part of **TRALI (Transfusion-Related Acute Lung Injury)**, a leading cause of transfusion-related mortality. It involves donor antibodies reacting against recipient neutrophils, leading to non-cardiogenic pulmonary edema. **High-Yield Clinical Pearls for NEET-PG:** * **Electrolyte Triad of MBT:** Hypocalcemia (citrate toxicity), Hyperkalemia (leaking from stored RBCs), and Metabolic Alkalosis (citrate converted to bicarbonate). * **Hypocalcemia:** Citrate used as an anticoagulant binds to the patient's ionized calcium. * **Lethal Triad of Trauma:** Hypothermia, Acidosis, and Coagulopathy (all exacerbated by MBT). * **Management:** Use blood warmers and follow a **1:1:1 ratio** (PRBC:FFP:Platelets) to prevent dilutional coagulopathy.

Question 142: A patient who underwent a Billroth II gastrectomy for peptic ulcer disease presents with postprandial pain. Endoscopy reveals oedematous and inflamed gastric mucosa. What is the most likely diagnosis?

A. Alkaline gastritis (Correct Answer)
B. Dumping syndrome
C. Gastroparesis
D. None of the above

Explanation: **Explanation:** **Alkaline Reflux Gastritis (Bile Reflux Gastritis)** is a common complication following gastric surgeries that bypass or destroy the pylorus, such as the **Billroth II gastrectomy**. 1. **Why it is correct:** In a Billroth II reconstruction, the pylorus is removed, allowing the alkaline contents of the duodenum (bile, pancreatic enzymes, and succus entericus) to reflux freely into the gastric remnant. This chronic exposure to bile acids and lysolecithin strips the protective gastric mucosal barrier, leading to chemical injury. Clinically, this presents as **postprandial epigastric pain** (often not relieved by vomiting) and weight loss. Endoscopically, the hallmark is **beefy red, oedematous, and inflamed gastric mucosa**. 2. **Why other options are wrong:** * **Dumping Syndrome:** Presents with vasomotor symptoms (palpitations, sweating, dizziness) and abdominal cramping/diarrhea shortly after meals due to rapid gastric emptying. It does not typically show inflammatory changes on endoscopy. * **Gastroparesis:** Refers to delayed gastric emptying. While it causes postprandial fullness and vomiting, it is characterized by retained food material rather than specific mucosal inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Postprandial epigastric pain, bile reflux/vomiting, and weight loss. * **Key Distinction:** Unlike peptic ulcer pain, the pain of alkaline gastritis is typically **not relieved** by antacids or vomiting. * **Treatment:** Medical management with bile acid sequestrants (Cholestyramine) is often ineffective. The definitive surgical treatment is a **Roux-en-Y gastrojejunostomy**, which diverts bile 40–60 cm away from the gastric remnant.

Question 143: Prolonged postoperative ileus is best treated by?

A. Long tube insertion
B. Calcium pantothenate
C. Laparotomy and exploration (Correct Answer)
D. Peristaltic stimulants

Explanation: **Explanation:** Postoperative ileus (POI) is a transient impairment of bowel motility following surgery, typically resolving within 3–5 days. However, **prolonged (paralytic) ileus** that persists beyond this period or recurs after initial recovery must be differentiated from **mechanical bowel obstruction**. **Why Laparotomy and Exploration is the correct answer:** In clinical practice, if an ileus is "prolonged" and does not respond to conservative management (NPO, IV fluids, electrolyte correction), the primary concern is an underlying surgical complication. This includes mechanical obstruction (e.g., internal herniation, early adhesions), anastomotic leak, or intra-abdominal sepsis/abscess. **Laparotomy and exploration** is the definitive step to identify and correct these life-threatening mechanical or inflammatory causes that mimic or perpetuate the ileus. **Analysis of Incorrect Options:** * **A. Long tube insertion:** While nasogastric or long intestinal tubes (e.g., Miller-Abbott) can decompress the bowel and provide symptomatic relief, they do not treat the underlying cause of a prolonged ileus. * **B. Calcium pantothenate:** This is a component of Vitamin B5 sometimes used historically to stimulate motility, but it lacks robust clinical evidence and is not a standard of care for prolonged POI. * **D. Peristaltic stimulants:** Drugs like metoclopramide or neostigmine are generally ineffective in POI and can be dangerous (causing perforation) if a mechanical obstruction has not been ruled out. **Clinical Pearls for NEET-PG:** * **Normal recovery sequence:** Small bowel (0–24 hrs) → Stomach (24–48 hrs) → Colon (48–72 hrs). * **Most common cause of POI:** Increased sympathetic activity and inflammatory response. * **Electrolyte trigger:** Hypokalemia is the most common metabolic cause of paralytic ileus. * **Management:** The "Enhanced Recovery After Surgery" (ERAS) protocols recommend chewing gum and early mobilization to prevent POI.

Question 144: A 67-year-old male weighing 60 kg, with a history of perforated diverticulitis requiring emergency laparotomy and sigmoid resection, has been in the ICU for a week. His serum albumin is 1.1 g/dL, and he was recently weaned from mechanical ventilation. The patient's colostomy is not functioning. Total parenteral nutrition (TPN) was initiated to provide 1800 kcal/24 h. Two days later, the patient develops respiratory distress necessitating reintubation and mechanical ventilation. Which serum electrolyte level should be checked?

A. Phosphate (Correct Answer)
B. Magnesium
C. Calcium
D. Selenium

Explanation: ### Explanation The clinical scenario describes **Refeeding Syndrome**, a potentially fatal condition occurring when nutritional support is reintroduced to severely malnourished patients (indicated here by a serum albumin of 1.1 g/dL and prolonged ICU stay). **Why Phosphate is the Correct Answer:** When TPN is initiated, the sudden glucose load triggers **insulin release**. Insulin shifts potassium, magnesium, and **phosphate** from the extracellular space into the cells to facilitate glycolysis and ATP production. Phosphate is rapidly depleted as it is used to phosphorylate glucose. Severe **hypophosphatemia** leads to a decrease in 2,3-DPG (shifting the oxygen dissociation curve) and ATP depletion. This results in **diaphragmatic weakness and respiratory failure**, explaining why the patient required reintubation. **Analysis of Incorrect Options:** * **B. Magnesium:** While hypomagnesemia occurs in refeeding syndrome and can cause arrhythmias or tremors, it is less commonly the primary cause of acute respiratory failure compared to phosphate depletion. * **C. Calcium:** Calcium levels are not the primary driver of refeeding syndrome pathology, though they may fluctuate due to albumin levels or phosphate shifts. * **D. Selenium:** Selenium is a trace element. Deficiency can occur with long-term TPN (causing cardiomyopathy), but it does not cause acute respiratory distress within 48 hours of starting nutrition. **Clinical Pearls for NEET-PG:** * **Definition:** Refeeding syndrome is characterized by fluid and electrolyte shifts (Hypophosphatemia, Hypokalemia, Hypomagnesemia) and vitamin deficiencies (Thiamine). * **Hallmark:** **Hypophosphatemia** is the most common and significant metabolic abnormality. * **Prevention:** "Start low and go slow." Begin at 10–15 kcal/kg/day and supplement with Thiamine (Vitamin B1) before starting feeds to prevent Wernicke’s encephalopathy. * **High-Yield Sign:** Failure to wean from a ventilator or sudden respiratory arrest after starting TPN is a classic board presentation for hypophosphatemia.

Question 145: What is the most common coagulopathy noted in surgical patients?

A. Thrombocytopenia (Correct Answer)
B. Afibrinogenemia
C. Fibrinolysis
D. Factor VIII deficiency

Explanation: **Explanation:** **Thrombocytopenia (Option A)** is the most common coagulopathy encountered in surgical patients. In the perioperative setting, a drop in platelet count is frequently observed due to several factors: 1. **Hemodilution:** Large-volume fluid resuscitation or massive blood transfusions (using stored blood deficient in viable platelets) dilute the existing platelet concentration. 2. **Consumption:** Increased utilization of platelets at the site of surgical trauma or due to systemic inflammatory response syndrome (SIRS). 3. **Sequestration:** Splenic sequestration or drug-induced destruction (e.g., Heparin-Induced Thrombocytopenia). **Analysis of Incorrect Options:** * **Afibrinogenemia (Option B):** This is a rare congenital or acquired condition. While fibrinogen levels can drop during massive hemorrhage (consumptive coagulopathy), it is far less common than a decrease in platelet count. * **Fibrinolysis (Option C):** Primary fibrinolysis is rare. Secondary fibrinolysis occurs in Disseminated Intravascular Coagulation (DIC), which is a severe complication but not the most common baseline coagulopathy. * **Factor VIII Deficiency (Option D):** This refers to Hemophilia A, an inherited disorder. While significant for surgery, it is a specific genetic condition rather than a common perioperative finding. **High-Yield Clinical Pearls for NEET-PG:** * **Massive Transfusion:** Defined as the replacement of >1 blood volume in 24 hours. The most common complication is **dilutional thrombocytopenia**. * **Platelet Thresholds:** For most major surgeries, a platelet count of **>50,000/µL** is required. For neurosurgery or ophthalmic surgery, **>100,000/µL** is preferred. * **Storage:** Platelets are stored at room temperature (20-24°C) with constant agitation and have a shelf life of only 5 days.

Question 146: Which of the following are contraindications for enteral nutrition?

A. Intestinal obstruction, Severe pancreatitis, Severe diarrhea, Intestinal fistula (Correct Answer)
B. Intestinal obstruction, Severe pancreatitis, Severe diarrhea
C. Intestinal obstruction, Severe diarrhea, Inflammatory Bowel Disease
D. Intestinal obstruction, Severe diarrhea, Intestinal fistula

Explanation: **Explanation** Enteral nutrition (EN) is the preferred method of nutritional support ("if the gut works, use it") as it maintains the mucosal barrier and prevents bacterial translocation. However, it is contraindicated when the gastrointestinal tract is non-functional, inaccessible, or requires complete rest. **1. Why Option A is Correct:** * **Intestinal Obstruction:** Feeding proximal to an obstruction leads to distension, vomiting, and potential perforation. * **Severe Pancreatitis:** While early enteral nutrition is now preferred in mild-to-moderate cases, **severe** necrotizing pancreatitis with ileus or hemodynamic instability requires bowel rest to avoid stimulating pancreatic secretions. * **Severe Diarrhea/Malabsorption:** Inability to absorb nutrients renders enteral feeding ineffective and can worsen electrolyte imbalances. * **High-Output Intestinal Fistula:** Feeding can increase fistula output, preventing spontaneous closure and worsening fluid loss. **2. Analysis of Incorrect Options:** * **Options B, C, and D** are incomplete. While they list valid contraindications, they omit one or more critical conditions included in the most comprehensive answer (Option A). * **Inflammatory Bowel Disease (IBD):** Mentioned in Option C, IBD is generally **not** a contraindication. In fact, enteral nutrition is often used as primary therapy in Crohn’s disease to induce remission. **3. NEET-PG High-Yield Pearls:** * **Absolute Contraindications:** Complete mechanical bowel obstruction, shock (hemodynamic instability), and intestinal ischemia. * **Relative Contraindications:** Severe ileus, high-output fistulas (>500ml/day), and severe GI bleeding. * **Clinical Tip:** Always choose the most "complete" list in MCQ formats. If the gut is distal to the pathology (e.g., a proximal fistula), distal feeding (e.g., jejunostomy) may still be possible, but general "intestinal fistula" remains a classic textbook contraindication.

Question 147: A 75-year-old man with a history of myocardial infarction 2 years ago, peripheral vascular disease with symptoms of claudication after walking half a block, hypertension, and diabetes presents with a large ventral hernia. He wishes to have the hernia repaired. Which of the following is the most appropriate next step in his preoperative workup?

A. He should undergo an electrocardiogram (ECG).
B. He should undergo an exercise stress test.
C. He should undergo coronary artery bypass prior to operative repair of his ventral hernia.
D. He should undergo a persantine thallium stress test and echocardiography. (Correct Answer)

Explanation: ### **Explanation** This patient is at high risk for perioperative cardiac events due to multiple clinical predictors (age >70, history of MI, DM, HTN) and poor functional capacity. **1. Why Option D is Correct:** The patient has significant **Peripheral Vascular Disease (PVD)** with claudication after walking only half a block. This indicates a **poor functional capacity (<4 METs)**. In patients with known cardiac risk factors who cannot perform an exercise stress test due to physical limitations (like claudication or arthritis), a **pharmacologic stress test** is indicated. * **Persantine (Dipyridamole) Thallium Stress Test:** Uses a vasodilator to simulate stress, identifying areas of inducible ischemia. * **Echocardiography:** Essential to assess the Left Ventricular (LV) ejection fraction and valvular function in a patient with a prior MI. **2. Why Other Options are Incorrect:** * **Option A:** While an ECG is mandatory, it is insufficient for risk stratification in a patient with multiple comorbidities and poor functional status. It does not provide information on inducible ischemia. * **Option B:** An exercise stress test is inappropriate because the patient’s claudication prevents him from reaching the target heart rate required for a diagnostic result. * **Option C:** Coronary Artery Bypass Grafting (CABG) is an invasive intervention. It is only performed if the stress test reveals severe, correctable triple-vessel disease or left main disease; it is never the "next step" before diagnostic stratification. **3. Clinical Pearls for NEET-PG:** * **Functional Capacity (METs):** If a patient can climb two flights of stairs or run a short distance (>4 METs), they generally do not need further cardiac testing, even with risk factors. * **Revised Cardiac Risk Index (Lee’s Criteria):** Key predictors include ischemic heart disease, CHF, cerebrovascular disease, DM on insulin, and Creatinine >2 mg/dL. * **Goldman’s Index:** Historically used, but Lee’s Criteria is now more common for non-cardiac surgery risk assessment. * **Timing after MI:** Elective surgery should ideally be delayed **6 months** after a myocardial infarction to minimize re-infarction risk.

Question 148: A 66-year-old female is scheduled for subtotal gastrectomy for adenocarcinoma. What is an important procedure-related complication?

A. Pneumothorax
B. Constipation
C. Hemolytic anemia
D. Bilious vomiting (Correct Answer)

Explanation: **Explanation:** **Subtotal gastrectomy** involves the resection of the distal portion of the stomach followed by reconstruction, typically via a **Billroth II (gastrojejunostomy)** or **Roux-en-Y** procedure. **Why Bilious Vomiting is Correct:** Bilious vomiting is a classic procedure-related complication following gastric surgery, often associated with **Afferent Loop Syndrome** or **Bile Reflux Gastritis**. 1. **Afferent Loop Syndrome:** Occurs in Billroth II reconstructions when the afferent limb (the segment of duodenum and jejunum proximal to the anastomosis) becomes partially obstructed. Bile and pancreatic secretions accumulate, causing distension and pain, which is relieved by forceful, projectile vomiting of bile-stained fluid (characteristically without food). 2. **Bile Reflux Gastritis:** The removal of the pylorus allows alkaline duodenal contents (bile) to reflux into the stomach remnant, causing mucosal irritation and chronic bilious vomiting. **Analysis of Incorrect Options:** * **A. Pneumothorax:** While a potential risk in thoracic or high abdominal surgeries (if the diaphragm is breached), it is not a specific or common complication of a subtotal gastrectomy. * **B. Constipation:** Postoperative patients are more likely to experience **diarrhea** (e.g., post-vagotomy diarrhea or dumping syndrome) rather than constipation. * **C. Hemolytic anemia:** Gastrectomy leads to **Megaloblastic anemia** (due to loss of Intrinsic Factor and Vitamin B12 deficiency) or **Iron deficiency anemia**, not hemolysis. **High-Yield NEET-PG Pearls:** * **Dumping Syndrome:** The most common post-gastrectomy complication; managed initially with small, dry, low-carb meals. * **Early vs. Late Dumping:** Early (vasomotor symptoms 20-30 mins post-meal); Late (hypoglycemia 2-3 hours post-meal). * **Roux-en-Y Reconstruction:** Preferred over Billroth II to prevent bile reflux because it diverts biliary secretions further downstream.

Question 149: Which of the following agents is of no value in the postoperative care of a hemophilic patient?

A. Tranexamic acid
B. Clopidogrel (Correct Answer)
C. Aminocaproic Acid
D. Factor VIII Cryoprecipitate

Explanation: ### Explanation **Core Concept:** Hemophilia is a congenital bleeding disorder characterized by a deficiency of clotting factors (Factor VIII in Hemophilia A; Factor IX in Hemophilia B). The primary goal of postoperative care is to **maintain hemostasis** and prevent secondary hemorrhage. **Why Clopidogrel is the Correct Answer:** Clopidogrel is an **antiplatelet agent** that irreversibly inhibits the P2Y12 ADP receptor on platelets. In a hemophilic patient, the coagulation cascade is already compromised. Administering an antiplatelet drug like Clopidogrel would further impair primary hemostasis, significantly **increasing the risk of life-threatening bleeding**. It has no therapeutic value in managing hemophilia and is actually contraindicated in the perioperative period for these patients. **Analysis of Other Options:** * **Tranexamic Acid & Aminocaproic Acid (Options A & C):** These are **antifibrinolytic agents**. They inhibit plasminogen activation, thereby stabilizing clots. They are highly valuable in hemophilic patients, especially after dental extractions or mucosal surgeries, to prevent clot lysis. * **Factor VIII Cryoprecipitate (Option D):** Cryoprecipitate is rich in Factor VIII, von Willebrand factor, and fibrinogen. While recombinant Factor VIII concentrate is now the gold standard, cryoprecipitate remains a source of Factor VIII to correct the underlying deficiency and ensure surgical hemostasis. **High-Yield Clinical Pearls for NEET-PG:** * **Target Levels:** For major surgery in Hemophilia A, Factor VIII levels should be raised to **80-100%** preoperatively and maintained above 50% for 10-14 days postoperatively. * **Desmopressin (DDAVP):** Useful in **Mild Hemophilia A** as it releases endogenous Factor VIII stores; it is ineffective in Hemophilia B. * **Contraindication:** Avoid **IM injections** and **NSAIDs/Aspirin** in hemophilic patients due to the risk of hematomas and platelet dysfunction.

Question 150: Hyponatremia in multiple myeloma is considered:

A. True
B. Relative
C. Absolute
D. Pseudo (Correct Answer)

Explanation: **Explanation:** The correct answer is **Pseudohyponatremia**. This occurs due to the **"solvent exclusion effect."** In Multiple Myeloma, there is a pathological increase in plasma proteins (monoclonal gammopathy). 1. **Why it is Pseudo:** Plasma is composed of roughly 93% water and 7% lipids/proteins. Sodium is dissolved only in the water phase. In Multiple Myeloma, the massive increase in paraproteins expands the non-aqueous fraction of the plasma volume. When laboratory analyzers (specifically indirect potentiometry) measure sodium, they calculate it based on the *total* volume of plasma rather than the *water* volume, leading to a falsely low sodium reading despite normal serum osmolality. 2. **Why other options are wrong:** * **True/Absolute:** These imply a genuine deficit of sodium or an excess of water (hypotonic state). In myeloma, the actual concentration of sodium in plasma water remains normal. * **Relative:** This usually refers to dilutional hyponatremia (e.g., SIADH or CHF), where water retention outweighs sodium, which is not the primary mechanism here. **NEET-PG High-Yield Pearls:** * **Causes of Pseudohyponatremia:** Hyperproteinemia (Multiple Myeloma, IVIG therapy) and Hyperlipidemia (Chylomicronemia). * **Diagnosis:** If pseudohyponatremia is suspected, check **Serum Osmolality**. It will be **normal** (275–295 mOsm/kg). * **Lab Tip:** To avoid this error, use **Direct Potentiometry** (Blood Gas Analyzers), which measures sodium activity in the water phase directly and is not affected by protein levels. * **Hyperglycemia** causes "Translocational Hyponatremia" (Hypertonic), not pseudohyponatremia. For every 100 mg/dL rise in glucose, sodium drops by ~1.6 mEq/L.

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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