Gastrointestinal Surgery Practice Questions

Q: What is the surgery of choice for chronic duodenal ulcer?

Highly selective vagotomy. **Explanation:** The primary goal in the surgical management of chronic duodenal ulcer (DU) is to reduce gastric acid secretion while minimizing postoperative complications. **Why Highly Selective Vagotomy (HSV) is the Correct Answer:** Highly Selective Vagotomy (also known as Parietal Cell Vagotomy) is currently the **surgery of choice** for elective cases of chronic duodenal ulcer. It involves denervating only the acid-secreting parietal cells of the fundus and body, while preserving the nerve supply to the antrum and pylorus (Nerves of Latarjet). Because the pyloric emptying mechanism remains intact, no drainage procedure (like pyloroplasty) is required. This results in the **lowest rate of post-gastrectomy complications** such as dumping syndrome, diarrhea, and nutritional deficiencies, despite a slightly higher recurrence rate compared to other procedures. **Analysis of Incorrect Options:** * **A. Vagotomy and Antrectomy:** This procedure has the **lowest recurrence rate** (approx. 1%) but the **highest morbidity and mortality**. It is generally reserved for recurrent ulcers rather than primary elective surgery. * **B. Total Gastrectomy:** This is an extreme procedure used for gastric malignancies or Zollinger-Ellison syndrome, never for uncomplicated chronic duodenal ulcers. * **C. Truncal Vagotomy and Pyloroplasty (TV+P):** While effective at reducing acid, it denervates the entire upper GI tract and destroys the pyloric sphincter. This leads to significant side effects like post-vagotomy diarrhea and dumping syndrome. **NEET-PG High-Yield Pearls:** * **Lowest Recurrence Rate:** Vagotomy + Antrectomy. * **Lowest Complication Rate:** Highly Selective Vagotomy. * **Most Common Complication of TV+P:** Diarrhea. * **Nerve preserved in HSV:** Criminal Nerve of Grassi (if missed, leads to recurrence) and the Nerves of Latarjet (to maintain antral pump).

Q: What is the most common cause of mediastinitis?

Esophageal rupture. **Explanation:** **Mediastinitis** is a life-threatening inflammatory condition of the mediastinum, most commonly caused by an infection. **Why Esophageal Rupture is Correct:** Esophageal perforation (Option B) is the **most common cause** of acute mediastinitis. The esophagus lacks a serosal layer, allowing luminal contents (saliva, gastric acid, and bacteria) to leak directly into the mediastinal space. This leads to rapid chemical irritation followed by polymicrobial infection. The most frequent site of perforation is the left posterolateral aspect of the distal esophagus (**Boerhaave Syndrome**) or iatrogenic injury during endoscopy. **Analysis of Incorrect Options:** * **Tracheal Rupture (A):** While it can cause pneumomediastinum, it is a much rarer cause of clinical mediastinitis compared to the esophagus, as the tracheobronchial tree is relatively sterile compared to the upper GI tract. * **Drugs (C):** Certain drugs (e.g., drug-induced esophagitis) can cause inflammation, but they do not typically lead to mediastinitis unless they cause a full-thickness perforation. * **Idiopathic (D):** Chronic fibrosing mediastinitis can sometimes be idiopathic, but acute mediastinitis almost always has a clear precipitating event (trauma, surgery, or perforation). **NEET-PG High-Yield Pearls:** * **Most common iatrogenic cause:** Endoscopy/instrumentation. * **Clinical Triad (Mackler’s Triad):** Vomiting, chest pain, and subcutaneous emphysema (pathognomonic for Boerhaave Syndrome). * **Hamman’s Sign:** A "crunching" sound heard over the precordium synchronous with the heartbeat, indicating mediastinal emphysema. * **Radiology:** Chest X-ray may show a widened mediastinum or "V-sign of Naclerio." * **Mortality:** Extremely high if treatment is delayed beyond 24 hours.

Q: Bleeding from a peptic ulcer most commonly involves which artery?

Gastroduodenal artery. **Explanation:** The **Gastroduodenal Artery (GDA)** is the correct answer because of its specific anatomical relationship with the duodenum. Most peptic ulcer bleeds occur due to a **posterior duodenal ulcer** (usually in the first part of the duodenum). The GDA runs directly behind the posterior wall of the duodenal bulb. When an ulcer erodes through the mucosa and muscularis layers posteriorly, it can penetrate the vessel wall, leading to massive, life-threatening upper gastrointestinal hemorrhage. **Analysis of Incorrect Options:** * **Left Gastric Artery:** While this is the most common artery involved in bleeding **gastric ulcers** (typically located on the lesser curvature), duodenal ulcers are more frequent than gastric ulcers, making the GDA the most common overall source of major peptic ulcer bleeding. * **Splenic Artery:** This artery runs along the superior border of the pancreas. It is most commonly associated with bleeding from a **gastric ulcer on the posterior wall of the stomach** or erosion due to chronic pancreatitis (pseudoaneurysm), but not standard peptic ulcers. * **Short Gastric Arteries:** These arise from the splenic artery and supply the fundus of the stomach. They are rarely involved in peptic ulcer disease but are clinically significant in cases of **gastric varices** secondary to splenic vein thrombosis. **High-Yield Clinical Pearls for NEET-PG:** * **Perforation vs. Bleeding:** Posterior duodenal ulcers **bleed** (GDA involvement); Anterior duodenal ulcers **perforate** (leading to pneumoperitoneum). * **Most common site of Peptic Ulcer:** First part of the duodenum (D1). * **Management:** The first line of management for an active bleed is endoscopic thermal coagulation or clipping. If surgery is required, the GDA is typically ligated.

Q: What is true about mesenteric vein thrombosis?

Surgery can lead to short-bowel syndrome. **Explanation:** Mesenteric Vein Thrombosis (MVT) accounts for approximately 5–15% of all mesenteric ischemic events. Unlike arterial occlusion, MVT often presents with a more subacute course, but it can lead to extensive bowel infarction if not managed promptly. **Why Option D is Correct:** MVT often involves the venous drainage of a significant portion of the small intestine. When gangrene occurs, the surgeon may find a long segment of non-viable bowel. Extensive resection of this necrotic segment (especially if >200 cm of the small bowel is removed) leads to **Short Bowel Syndrome**, characterized by malabsorption and malnutrition. **Why Other Options are Incorrect:** * **Option A:** Peritoneal signs (rigidity, rebound tenderness) are **late findings** indicating bowel infarction and perforation. In the early stages, there is often a "pain out of proportion to physical findings," where the abdomen remains soft despite severe pain. * **Option B:** While it *can* involve long segments, it does not **invariably** do so. Segmental involvement is possible, especially in secondary MVT related to localized triggers like pancreatitis or trauma. * **Option C:** While IV Heparin is the mainstay of **medical management** to prevent clot propagation, it is not the definitive "treatment of choice" if the patient has signs of peritonitis. In such cases, **emergency laparotomy** is mandatory. **NEET-PG High-Yield Pearls:** * **Most common site:** Superior Mesenteric Vein (SMV). * **Risk Factors:** Inherited thrombophilias (Protein C/S deficiency, Factor V Leiden) or local factors (Portal hypertension, pylephlebitis). * **Imaging of Choice:** Contrast-enhanced CT (CECT) showing a "rim sign" or filling defects in the vein. * **Classic Presentation:** Post-prandial pain, occult blood in stools, and a history of hypercoagulability.

Q: What is the most common site of gastrointestinal stromal tumors (GIST)?

Stomach. **Explanation:** Gastrointestinal Stromal Tumors (GISTs) are the most common mesenchymal neoplasms of the gastrointestinal tract, originating from the **Interstitial Cells of Cajal (ICC)**—the "pacemaker" cells of the gut. **1. Why Stomach is Correct:** The **stomach** is the most frequent site, accounting for approximately **60%** of all GIST cases. These tumors typically present as submucosal masses and are most commonly found in the gastric body. **2. Analysis of Incorrect Options:** * **Small Intestine:** This is the second most common site, accounting for about **25–30%** of cases (most frequently in the duodenum). While common, it remains significantly less frequent than the stomach. * **Large Intestine:** Colorectal GISTs are relatively rare, representing only about **5%** of cases. * **Spleen:** GISTs are tumors of the GI tract wall. The spleen is a lymphoid organ and is not a primary site for GISTs. Extra-gastrointestinal stromal tumors (EGISTs) can occur in the omentum or mesentery, but rarely involve the spleen. **3. High-Yield Clinical Pearls for NEET-PG:** * **Molecular Marker:** Most GISTs (95%) express **CD117 (c-KIT)**, a tyrosine kinase receptor. **DOG1** is another highly sensitive marker. * **Genetics:** Most cases involve mutations in the *c-KIT* gene; a subset involves the *PDGFRA* gene. * **Treatment:** The gold standard for localized GIST is **surgical resection** with negative margins (lymphadenectomy is usually not required). * **Targeted Therapy:** **Imatinib mesylate** (a tyrosine kinase inhibitor) is the first-line treatment for metastatic, unresectable, or recurrent GIST. * **Rule of 10s:** Roughly 10-30% of GISTs are clinically malignant. Size (>5 cm) and mitotic index (>5/50 HPF) are the best predictors of malignant potential.

Q: Which of the following is NOT an indication for prophylactic cholecystectomy?

Diabetes mellitus. **Explanation:** Asymptomatic gallstones generally do not require surgery, as the risk of complications is lower than the risk of surgery. However, certain conditions warrant **prophylactic cholecystectomy** due to a significantly increased risk of gallbladder carcinoma or severe complications. **1. Why Diabetes Mellitus is the Correct Answer:** In the past, diabetes was considered an indication for prophylactic cholecystectomy due to fears of rapidly progressing gangrenous cholecystitis. However, modern evidence shows that diabetics do not have a higher risk of developing complications compared to non-diabetics. Therefore, **asymptomatic gallstones in a diabetic patient are managed expectantly**, just like in the general population. **2. Why the other options are wrong (Indications for Surgery):** * **Hemoglobinopathy (e.g., Sickle Cell Anemia, Hereditary Spherocytosis):** These patients have a high rate of pigment stone formation. Prophylactic surgery is recommended to avoid "diagnostic confusion" between a hemolytic crisis and acute cholecystitis. * **Gallstone size >3 cm:** Large stones are associated with a significantly higher risk of **gallbladder carcinoma** due to chronic mucosal irritation. * **Porcelain Gallbladder:** This refers to intramural calcification of the gallbladder wall. It is traditionally associated with a high risk (up to 25%) of gallbladder malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Other indications for prophylactic cholecystectomy:** Anomalous pancreaticobiliary ductal union (APBDU), adenomatous gallbladder polyps (>1 cm), and "Ship-to-shore" (patients in remote areas with no access to surgical care). * **Bariatric Surgery:** Patients undergoing bariatric procedures with asymptomatic stones should have a cholecystectomy concurrently. * **Mirizzi Syndrome:** A rare complication where a stone in the cystic duct compresses the common hepatic duct, often requiring surgical intervention.

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

Bilious vomiting. **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.

Q: What is the investigation of choice for appendicitis in adults?

CT Scan. **Explanation:** The diagnosis of acute appendicitis is primarily clinical; however, when imaging is required to confirm the diagnosis or rule out differentials in adults, **Contrast-Enhanced Computed Tomography (CECT) of the abdomen and pelvis** is the investigation of choice. **1. Why CT Scan is the Correct Answer:** CT scan has a high sensitivity (>94%) and specificity (>95%) for appendicitis. In adults, it is superior to other modalities because it can clearly visualize the appendix (diameter >6mm), periappendiceal fat stranding, and potential complications like phlegmon or abscess. It is also highly effective at identifying alternative causes of acute abdominal pain. **2. Why Other Options are Incorrect:** * **USG (Ultrasound):** While often the first-line investigation in **children and pregnant women** to avoid radiation, it is operator-dependent and limited by body habitus (obesity) or overlying bowel gas in adults. * **Serum ESR:** This is a non-specific inflammatory marker. While it may be elevated, it cannot localize the pathology to the appendix and is not diagnostic. * **MRI Abdomen:** While highly accurate, it is expensive, time-consuming, and not readily available in emergency settings. It is typically reserved for pregnant patients when USG is inconclusive. **Clinical Pearls for NEET-PG:** * **Gold Standard/IOC:** CT Scan (specifically CECT). * **First-line in Pregnancy/Children:** Ultrasound. * **Most common sign on CT:** Appendiceal diameter >6 mm with wall thickening. * **Alvarado Score:** A clinical scoring system (MANTRELS) where a score of ≥7 usually indicates a need for surgery. * **Appendicular Artery:** A branch of the ileocolic artery (derived from the Superior Mesenteric Artery), which is an end-artery, making the appendix prone to gangrene.

Q: What is the most common cause of acute intestinal obstruction?

Adhesions. **Explanation:** **1. Why Adhesions are Correct:** Postoperative **peritoneal adhesions** are the leading cause of acute intestinal obstruction worldwide, accounting for approximately **60–70%** of all cases of small bowel obstruction (SBO). They develop as a result of peritoneal injury during surgery, leading to fibrin deposition and fibrous band formation that can kink or compress the bowel. In patients with a history of abdominal surgery, adhesions are the presumed cause until proven otherwise. **2. Analysis of Incorrect Options:** * **Inguinal Hernias:** Historically, obstructed hernias were the most common cause. However, with the rise in elective surgical procedures, adhesions have overtaken them. Hernias remain the most common cause in patients with a **virgin abdomen** (no previous surgery) and the most common cause of strangulated obstruction. * **Volvulus:** This is a common cause of large bowel obstruction (specifically Sigmoid Volvulus), particularly in certain geographical regions (the "Volvulus Belt"), but it is not the most common cause of general intestinal obstruction. * **Internal Hernias:** These occur when the bowel protrudes through a mesenteric defect or a physiological opening (e.g., Foramen of Winslow). While clinically significant, they are rare compared to adhesions. **3. NEET-PG High-Yield Pearls:** * **Most common cause of SBO:** Adhesions. * **Most common cause of LBO:** Malignancy (Colorectal Cancer). * **Most common cause of obstruction in children:** Intussusception. * **Most common cause of obstruction in a virgin abdomen:** Hernia. * **Cardinal features of obstruction:** Pain, vomiting, distension, and absolute constipation (obstipation). * **X-ray finding:** Multiple air-fluid levels (Step-ladder pattern) is characteristic of SBO.

Question 1

What is the surgery of choice for chronic duodenal ulcer?

Accepted Answer

Highly selective vagotomy

Answer

Vagotomy and antrectomy

Answer

Total gastrectomy

Answer

Truncal vagotomy and pyloroplasty

Question 2

What is the most common cause of mediastinitis?

Accepted Answer

Esophageal rupture

Answer

Tracheal rupture

Answer

Drugs

Answer

Idiopathic

Question 3

Bleeding from a peptic ulcer most commonly involves which artery?

Accepted Answer

Gastroduodenal artery

Answer

Left gastric artery

Answer

Splenic artery

Answer

Short gastric artery

Question 4

What is true about mesenteric vein thrombosis?

Accepted Answer

Surgery can lead to short-bowel syndrome

Answer

Peritoneal signs are always present

Answer

Invariably involves a long length of bowel

Answer

IV Heparin is the treatment of choice

Question 5

What is the most common site of gastrointestinal stromal tumors (GIST)?

Accepted Answer

Stomach

Answer

Small intestine

Answer

Large intestine

Answer

Spleen

Question 6

An adult presented with hematemesis and upper abdominal pain. Endoscopy revealed a growth at the pyloric antrum of the stomach. CT scan showed growth involving the pyloric antrum without infiltration or invasion into surrounding structures and no evidence of distant metastasis. At laparotomy, neoplastic growth was observed to involve the posterior wall of the stomach and the pancreas, extending 6 cm up to the tail of the pancreas. What is the most appropriate surgical management?

Accepted Answer

Partial gastrectomy and distal pancreatectomy

Answer

Closure of the abdomen

Answer

Antrectomy and vagotomy

Answer

Partial gastrectomy, distal pancreatectomy, and splenectomy

Question 7

Which of the following is NOT an indication for prophylactic cholecystectomy?

Accepted Answer

Diabetes mellitus

Answer

Hemoglobinopathy

Answer

Gallstone size greater than 3 cm

Answer

Porcelain gallbladder

Question 8

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

Accepted Answer

Bilious vomiting

Answer

Pneumothorax

Answer

Constipation

Answer

Hemolytic anemia

Question 9

What is the investigation of choice for appendicitis in adults?

Accepted Answer

CT Scan

Answer

USG

Answer

Serum ESR

Answer

MRI Abdomen

Question 10

What is the most common cause of acute intestinal obstruction?

Accepted Answer

Adhesions

Answer

Volvulus

Answer

Inguinal hernias

Answer

Internal hernias

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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