Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 651: Which of the following is NOT true regarding gastric outlet obstruction?

A. Hypokalemia
B. Hypochloremia
C. Alkaline urine (Correct Answer)
D. Metabolic alkalosis

Explanation: In Gastric Outlet Obstruction (GOO), persistent vomiting leads to a classic metabolic derangement known as **Paradoxical Aciduria**, making "Alkaline urine" the incorrect statement. ### Pathophysiology of Metabolic Derangement 1. **Vomiting:** Causes loss of water, **H⁺**, and **Cl⁻**. This results in **Hypochloremic Metabolic Alkalosis**. 2. **Dehydration:** Triggers the Renin-Angiotensin-Aldosterone System (RAAS). Aldosterone acts on the kidneys to reabsorb Na⁺ and water. 3. **Initial Phase:** To maintain electrical neutrality while reabsorbing Na⁺, the kidney initially excretes K⁺ and HCO₃⁻. This results in **Hypokalemia** and alkaline urine. 4. **Late Phase (Paradoxical Aciduria):** As dehydration and hypokalemia worsen, the kidney prioritizes Na⁺ reabsorption over pH balance. Since K⁺ is depleted, the kidney is forced to exchange Na⁺ for **H⁺ ions** in the distal tubule. Consequently, the urine becomes **acidic** despite the systemic alkalosis. ### Analysis of Options * **A. Hypokalemia:** True. Occurs due to direct loss in vomitus and renal excretion in exchange for sodium. * **B. Hypochloremia:** True. Direct loss of HCl from the stomach leads to low serum chloride. * **C. Alkaline urine:** **Incorrect.** While urine is initially alkaline, the hallmark of established GOO is **Paradoxical Aciduria** (acidic urine). * **D. Metabolic alkalosis:** True. Caused by the massive loss of hydrogen ions (H⁺). ### NEET-PG High-Yield Pearls * **Classic Triad:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria. * **Fluid of Choice:** **0.9% Normal Saline** (Normal saline is preferred over Ringer’s Lactate because it corrects both the volume deficit and the chloride deficiency). * **Electrolyte Correction:** Potassium should be replaced only after ensuring adequate urine output.

Question 652: Mallory Weiss Syndrome is caused due to a tear in which part of the esophagus?

A. Lower esophageal mucosa.
B. Upper esophageal mucosa.
C. Cricopharyngeal junction.
D. Gastroesophageal junction. (Correct Answer)

Explanation: **Explanation:** **Mallory-Weiss Syndrome (MWS)** is characterized by non-transmural, longitudinal mucosal lacerations that occur due to a sudden increase in intra-abdominal pressure. This is most commonly triggered by forceful vomiting, retching, or coughing, often associated with alcohol binge drinking. **Why Option D is Correct:** The anatomical site of the tear is most frequently the **Gastroesophageal (GE) junction**. Specifically, the lacerations typically involve the gastric mucosa just distal to the GE junction or extend across the junction into the distal esophagus. The GE junction is the point of maximum stress during the rapid expansion of the stomach contents against a closed or poorly coordinated sphincter. **Why Other Options are Incorrect:** * **Option A & B:** While the lower esophagus is involved, the term "Gastroesophageal junction" is the more precise anatomical description required for NEET-PG. The upper esophagus is never involved in MWS. * **Option C:** The cricopharyngeal junction is the site for **Zenker’s Diverticulum**, not Mallory-Weiss tears. **High-Yield Clinical Pearls for NEET-PG:** * **Presentation:** Painless hematemesis following an episode of forceful vomiting (the "classic" history). * **Diagnosis:** Gold standard is **Upper GI Endoscopy (UGIE)**, which reveals longitudinal mucosal streaks. * **Management:** Most cases (80-90%) bleed self-limit and heal spontaneously. Active bleeding is managed endoscopically with epinephrine injection, clipping, or thermal coagulation. * **Distinction:** Do not confuse MWS with **Boerhaave Syndrome**, which is a *transmural* (full-thickness) perforation of the esophagus, usually occurring in the left posterolateral aspect of the distal esophagus, and presents with severe chest pain and subcutaneous emphysema.

Question 653: What is the commonly done treatment for a single perforation of typhoid in the ileum?

A. Direct closure (Correct Answer)
B. Graham patch
C. Resection of ileum
D. Ileostomy

Explanation: **Explanation:** Typhoid perforation is a serious complication of enteric fever, typically occurring in the **third week** of illness. The ulcers usually occur on the antimesenteric border of the **terminal ileum** (within 60 cm of the ileocecal valve) due to the high concentration of Peyer’s patches in this region. **Why Direct Closure is Correct:** For a **single, small perforation** with minimal peritoneal contamination and a stable patient, **primary double-layer closure** (debridement of edges followed by transverse closure to avoid narrowing the lumen) is the gold standard. This is the most commonly performed procedure because it is quick and effective in patients who are often toxemic and poor surgical candidates. **Analysis of Incorrect Options:** * **Graham Patch:** This is the treatment of choice for perforated **duodenal ulcers**, not typhoid perforations. The ileal wall in typhoid is often friable, making a simple omental patch less secure than direct suturing. * **Resection of Ileum:** This is reserved for cases with **multiple perforations** clustered together, a very large/ragged perforation, or if the bowel is gangrenous. It is more invasive and carries higher morbidity. * **Ileostomy:** This is indicated only in cases of **severe fecal peritonitis**, delayed presentation (>24–48 hours), or when the patient is in septic shock and cannot tolerate a primary repair. **Clinical Pearls for NEET-PG:** * **Location:** Most common site is the **terminal ileum** (antimesenteric border). * **Timing:** Usually occurs in the **3rd week** of infection. * **Diagnosis:** Best initial test is an X-ray (erect abdomen) showing **pneumoperitoneum** (gas under the diaphragm). * **Surgical Principle:** Always check the proximal 2 feet of the ileum for additional perforations before closing.

Question 654: A patient presents with a recurrent duodenal ulcer of 2.5 cm size. What is the procedure of choice?

A. Truncal vagotomy and antrectomy (Correct Answer)
B. Truncal vagotomy and gastrojejunostomy
C. Highly selective vagotomy
D. Laparoscopic vagotomy and gastrojejunostomy

Explanation: ### Explanation The management of duodenal ulcers (DU) has shifted toward medical therapy; however, surgery remains indicated for complications or recurrence. In this case, the key factors are the **recurrence** and the **large size (2.5 cm)** of the ulcer. **1. Why Option A is Correct:** **Truncal Vagotomy (TV) and Antrectomy** is considered the "Gold Standard" for recurrent or refractory duodenal ulcers because it offers the **lowest recurrence rate (approximately 1%)**. * **Mechanism:** TV eliminates the cephalic phase of gastric acid secretion, while antrectomy removes the source of gastrin (G-cells). This dual approach provides the most potent reduction in acid output. * **Indication:** It is specifically preferred for recurrent ulcers or large/giant ulcers where simpler procedures are likely to fail. **2. Why Other Options are Incorrect:** * **Option B (TV + Gastrojejunostomy):** This is primarily a drainage procedure used when there is gastric outlet obstruction. While it reduces acid, the recurrence rate is higher (approx. 5-10%) compared to antrectomy because the antrum remains intact. * **Option C (Highly Selective Vagotomy):** While HSV has the lowest rate of post-operative complications (like dumping syndrome), it has the **highest recurrence rate (up to 15%)**. It is generally contraindicated in cases where an ulcer has already recurred or is very large. * **Option D (Laparoscopic Vagotomy + GJ):** This is a minimally invasive variation of Option B and carries the same limitations regarding recurrence. **3. NEET-PG High-Yield Pearls:** * **Lowest Recurrence Rate:** TV + Antrectomy (~1%). * **Lowest Complication Rate:** Highly Selective Vagotomy (HSV). * **Most Common Complication of TV:** Diarrhea. * **Giant Duodenal Ulcer:** Defined as >2 cm in diameter; these carry a higher risk of perforation and malignancy (if gastric) and usually require more definitive resection like antrectomy. * **Reconstruction:** After antrectomy, continuity is restored via **Billroth I** (gastroduodenostomy) or **Billroth II** (gastrojejunostomy).

Question 655: All of the following are complications of peptic ulcer surgery except?

A. Duodenal stump blowout
B. Dumping syndrome
C. Delayed gastric emptying
D. Steatorrhea (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Steatorrhea**. While peptic ulcer surgeries (like Billroth I/II or Vagotomy) can lead to various nutritional and functional complications, **steatorrhea is not a direct or common complication** of these procedures. While mild fat malabsorption can occur due to rapid transit or poor mixing of bile/pancreatic enzymes (maldigestion), frank steatorrhea is clinically rare and usually points toward other pathologies like chronic pancreatitis or Celiac disease. **Analysis of Options:** * **A. Duodenal stump blowout:** This is a life-threatening early complication specific to **Billroth II reconstruction**. It occurs due to increased intraluminal pressure in the afferent loop or poor surgical closure of the duodenum. * **B. Dumping syndrome:** A classic post-gastrectomy complication. **Early dumping** (vasomotor symptoms) occurs due to hyperosmolar loads in the small bowel, while **Late dumping** (hypoglycemia) occurs due to an insulin surge. * **C. Delayed gastric emptying:** Also known as gastroparesis, this is common after **vagotomy** (due to loss of parasympathetic stimulation) or as a transient postoperative phenomenon. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication** after subtotal gastrectomy: **Dumping Syndrome.** * **Most common metabolic complication:** **Iron deficiency anemia** (due to bypass of the duodenum, the primary site of iron absorption). * **Vitamin B12 deficiency** occurs due to the loss of Intrinsic Factor (IF) from parietal cells. * **Afferent Loop Syndrome** is unique to Billroth II and presents with projectile, non-bilious vomiting that relieves abdominal pain.

Question 656: Endoscopy is contraindicated in which of the following conditions?

A. Achalasia (Correct Answer)
B. Peptic stricture
C. Esophageal carcinoma
D. Esophageal web

Explanation: ### Explanation The correct answer is **Achalasia (Option A)**. In the context of this specific question, the contraindication refers to the **increased risk of iatrogenic perforation** during endoscopy. In Achalasia Cardia, the esophagus is often massively dilated (mega-esophagus) and contains undigested food residue. More importantly, the esophagus becomes **tortuous and sigmoid-shaped**, and the lower esophageal sphincter (LES) fails to relax. During endoscopy, the tip of the scope can easily get lodged in a redundant "pouch" or diverticulum of the dilated esophagus. If the endoscopist applies pressure to overcome the resistance of the non-relaxing LES, there is a high risk of perforating the weakened, thinned-out esophageal wall. **Analysis of Incorrect Options:** * **B. Peptic Stricture:** Endoscopy is the gold standard for diagnosis (to rule out malignancy) and treatment (endoscopic dilatation). * **C. Esophageal Carcinoma:** Endoscopy with biopsy is the definitive diagnostic investigation for esophageal cancer. * **D. Esophageal Web:** Endoscopy is both diagnostic and therapeutic, as the passage of the endoscope itself often ruptures the thin web. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications for Endoscopy:** Suspected perforated viscus (e.g., perforated peptic ulcer), shock, and acute myocardial infarction (unless life-threatening GI bleed). * **Relative Contraindications:** Zenker’s diverticulum (high risk of perforation), large aortic aneurysm, and uncooperative patients. * **Achalasia Diagnosis:** While endoscopy is done to rule out "Pseudo-achalasia" (malignancy at the GE junction), **Manometry** remains the gold standard for diagnosis. * **Radiology:** The "Bird’s Beak" appearance on Barium swallow is characteristic of Achalasia.

Question 657: All of the following statements about carcinoid tumors are true except:

A. It is the most common malignant tumor of the small intestine
B. Extensive involvement of small intestine is associated with higher probability of lung metastasis (Correct Answer)
C. Five year survival for carcinoid tumors is >60%
D. Appendiceal carcinoids are more common in females

Explanation: **Explanation:** **1. Why Option B is the Correct Answer (False Statement):** In carcinoid tumors of the small intestine, the probability of metastasis is primarily determined by the **size of the primary tumor**, not the extent of intestinal involvement. Tumors <1 cm have a <2% risk of metastasis, while those >2 cm have an >80% risk. Furthermore, carcinoid tumors typically metastasize to the **liver** first via the portal circulation. Lung metastasis is rare and usually occurs only after significant hepatic involvement (except in primary bronchial carcinoids). **2. Analysis of Other Options:** * **Option A (True):** Carcinoid tumors (Neuroendocrine tumors) have surpassed adenocarcinoma to become the most common malignancy of the small intestine. * **Option C (True):** Carcinoid tumors are generally slow-growing (indolent). The overall 5-year survival rate is high, often exceeding 60-70%, even in the presence of nodal metastasis. * **Option D (True):** Appendiceal carcinoids (the most common site for carcinoids overall in some series, though small bowel is more common for symptomatic ones) show a slight female preponderance, often diagnosed incidentally during appendectomy. **Clinical Pearls for NEET-PG:** * **Most common site:** Appendix (overall), but Small Intestine (specifically Ileum) is the most common site for tumors causing **Carcinoid Syndrome**. * **Carcinoid Syndrome:** Occurs only when vasoactive substances (Serotonin, Bradykinin) bypass hepatic metabolism (i.e., when liver metastasis is present or the primary is extra-intestinal like Bronchial carcinoid). * **Diagnosis:** Best initial screening test is **24-hour urinary 5-HIAA**. Most sensitive imaging is **Somatostatin receptor scintigraphy (OctreoScan)** or Ga-68 DOTATATE PET/CT. * **Treatment:** Surgical resection; Octreotide is used for symptomatic relief.

Question 658: The most common site of a benign peptic gastric ulcer is:

A. Upper third of lesser curvature
B. Greater curvature
C. Pyloric antrum
D. Lesser curvature near incisura angularis (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Lesser curvature near incisura angularis.** **1. Why it is correct:** The majority of benign gastric ulcers (approximately 60%) are **Type I ulcers** according to the Johnson Classification. These occur typically along the **lesser curvature**, specifically at the **incisura angularis** (the junction of the body and the antrum). This site is a "watershed area" where the acid-secreting parietal cell mucosa of the body meets the gastrin-secreting mucosa of the antrum. This transitional zone is physiologically more susceptible to mucosal injury and breakdown of protective barriers. **2. Why other options are incorrect:** * **A. Upper third of lesser curvature:** While ulcers can occur here (Type IV), they are less common and technically more challenging to manage surgically. * **B. Greater curvature:** Ulcers here are rare. A gastric ulcer located on the greater curvature should always be biopsied extensively, as there is a significantly higher suspicion of **malignancy** compared to lesser curvature ulcers. * **C. Pyloric antrum:** While Type II and Type III ulcers involve the antrum or prepyloric region, they are less frequent than Type I ulcers and are usually associated with gastric acid hypersecretion (similar to duodenal ulcers). **3. NEET-PG High-Yield Pearls:** * **Johnson Classification:** * **Type I:** Lesser curve/Incisura (Most common; normal/low acid). * **Type II:** Two ulcers (Body + Duodenal; high acid). * **Type III:** Prepyloric (High acid). * **Type IV:** High on lesser curve near GE junction (Normal/low acid). * **Type V:** Anywhere (Associated with NSAID use). * **Rule of Thumb:** Gastric ulcers have a higher risk of malignancy than duodenal ulcers; therefore, **multiple biopsies** (at least 6-8 from the ulcer edge) are mandatory for all gastric ulcers.

Question 659: Which of the following findings contributes 2 points to the Alvarado score?

A. Migratory pain
B. Tenderness at McBurney's point (Correct Answer)
C. Rebound tenderness
D. Elevated temperature

Explanation: The **Alvarado Score** (also known by the mnemonic **MANTRELS**) is a clinical scoring system used to diagnose acute appendicitis. It consists of 8 components with a total possible score of 10. ### Why Option B is Correct: In the Alvarado scoring system, most clinical features are assigned **1 point**, but the two most significant indicators of inflammation are "weighted" and assigned **2 points** each. These are: 1. **Tenderness in the Right Iliac Fossa (McBurney’s point)** 2. **Leukocytosis** (WBC count > 10,000/mm³) ### Why Other Options are Incorrect: * **A. Migratory pain:** This refers to pain shifting from the periumbilical region to the right iliac fossa. It contributes only **1 point**. * **C. Rebound tenderness:** This indicates peritoneal irritation but contributes only **1 point**. * **D. Elevated temperature:** Fever (typically >37.3°C or 99.1°F) contributes only **1 point**. ### High-Yield Clinical Pearls (MANTRELS Mnemonic): To excel in NEET-PG, remember the score breakdown using the mnemonic: * **M**igratory RIF pain: 1 * **A**norexia: 1 * **N**ausea/Vomiting: 1 * **T**enderness in RIF: **2** * **R**ebound tenderness: 1 * **E**levated temperature: 1 * **L**eukocytosis: **2** * **S**hift to the left (Neutrophilia): 1 **Interpretation:** * **Score 7–10:** High probability of appendicitis (Proceed to surgery). * **Score 5–6:** Equivocal/Possible (Observation or CT scan recommended). * **Score <4:** Low probability. **Note:** In the **Modified Alvarado Score**, the "Shift to the left" component is removed, making the total score out of 9.

Question 660: What is the most useful investigation for profuse lower gastrointestinal bleeding?

A. Proctosigmoidoscopy
B. Colonoscopy (Correct Answer)
C. Double contrast barium enema
D. Selective arteriography

Explanation: **Explanation:** In the management of acute lower gastrointestinal (LGI) bleeding, **Colonoscopy** is considered the most useful investigation. Its primary advantage is that it is both **diagnostic and therapeutic**. It allows for the direct visualization of the mucosa to identify the source (e.g., diverticulosis, angiodysplasia, or polyps) and enables immediate intervention through clipping, thermal coagulation, or epinephrine injection. For a colonoscopy to be successful in profuse bleeding, the patient must be hemodynamically stabilized and undergo a rapid "purge" or bowel preparation. **Analysis of Incorrect Options:** * **A. Proctosigmoidoscopy:** While useful for identifying anorectal causes (like hemorrhoids or distal proctitis), it only visualizes the distal 25–30 cm of the bowel, missing the majority of LGI sources. * **C. Double contrast barium enema:** This is **contraindicated** in acute bleeding. Barium interferes with subsequent endoscopy or angiography and carries a risk of perforation in acute inflammatory conditions. It also lacks therapeutic potential. * **D. Selective arteriography:** This is indicated only when bleeding is so massive that it prevents endoscopic visualization (rate >0.5 ml/min). While it can be therapeutic (embolization), it is invasive and has a lower overall yield compared to colonoscopy. **Clinical Pearls for NEET-PG:** * **First step in LGI bleed:** Hemodynamic stabilization (IV fluids/resuscitation). * **Most common cause of profuse LGI bleed:** Diverticulosis (painless). * **Most common cause of LGI bleed in children:** Meckel’s Diverticulum (Investigation of choice: **Technetium-99m pertechnetate scan**). * **Investigation of choice for obscure/occult GI bleed:** Capsule endoscopy.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

Practice Questions

Inflammatory Bowel Disease

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Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

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Anorectal Disorders

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Colorectal Neoplasms

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Gastrointestinal Stomas

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Bariatric Surgery Principles

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