Gastrointestinal Surgery Practice Questions

Q: Duodenal ulcer is most commonly caused by:

H. pylori. **Explanation:** The primary etiology of Peptic Ulcer Disease (PUD), specifically duodenal ulcers (DU), is **Helicobacter pylori** infection. It is found in approximately **90-95%** of patients with duodenal ulcers. H. pylori causes hypergastrinemia and increased acid secretion by colonizing the antrum and inhibiting D-cells (which produce somatostatin), leading to the erosion of the duodenal mucosa. **Analysis of Options:** * **H. pylori (Correct):** It is the most common cause worldwide. Eradication of the bacteria significantly reduces the recurrence rate of the ulcer. * **NSAID therapy:** This is the **second most common** cause of PUD. While NSAIDs are more strongly associated with **gastric ulcers** (due to direct mucosal injury and systemic prostaglandin inhibition), they are a less frequent cause of duodenal ulcers compared to H. pylori. * **Stress ulcer:** These are acute mucosal erosions occurring in critically ill patients (e.g., Curling’s ulcer in burns or Cushing’s ulcer in head trauma). They are not the "most common" cause in the general population. * **GERD:** Gastroesophageal Reflux Disease is a consequence of acid reflux into the esophagus; it does not cause duodenal ulcers, though both conditions may coexist due to acid hypersecretion. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most duodenal ulcers occur in the **first part of the duodenum** (95%), usually within 2 cm of the pylorus. * **Pain Pattern:** DU pain typically occurs 2–3 hours after meals and is **relieved by food** (unlike gastric ulcers, where pain is aggravated by food). * **Investigation of Choice:** Upper GI Endoscopy (UGIE). * **Zollinger-Ellison Syndrome:** Suspect this if ulcers are multiple, distal to the duodenal bulb, or refractory to treatment.

Q: What is the best treatment for a refractory peri-anal fistula in Crohn's disease?

Infliximab. **Explanation:** The management of perianal Crohn’s disease (PCD) is complex and requires a multidisciplinary approach. For **refractory perianal fistulas**, medical therapy with biological agents is the gold standard. **1. Why Infliximab is correct:** Infliximab (a chimeric monoclonal antibody against TNF-α) is the first-line medical treatment for complex or refractory fistulizing Crohn’s disease. It is the only agent proven in randomized controlled trials (ACCENT II study) to be effective in inducing and maintaining the closure of enterocutaneous and perianal fistulas. It works by reducing transmural inflammation, allowing the fistula tract to heal. **2. Why the other options are incorrect:** * **Fistulectomy (A):** In Crohn’s disease, aggressive surgeries like fistulectomy are generally **contraindicated** because the underlying tissue has poor healing capacity. It carries a high risk of non-healing wounds, fecal incontinence, and may eventually necessitate a proctectomy. Surgery in PCD is usually limited to "conservative" measures like seton placement to prevent abscess formation. * **Olasalizine (C) & Mesalamine (D):** These are 5-ASA derivatives. While they are used for maintaining remission in mild-to-moderate luminal ulcerative colitis or Crohn’s, they have **no proven efficacy** in treating fistulizing disease or perianal complications. **NEET-PG High-Yield Pearls:** * **First-line for simple fistula:** Metronidazole or Ciprofloxacin (Antibiotics). * **Best imaging modality:** MRI Pelvis (Gold standard for mapping the fistula tract). * **Surgical goal:** "Drainage, not cure." Use non-cutting setons to maintain patency and prevent recurrent abscesses. * **Combination Therapy:** Combining Infliximab with surgical seton drainage yields better results than either alone.

Q: A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

Delorme procedure. ***Delorme procedure*** - **Perineal approach** ideal for **high anesthetic risk** patients as it avoids general anesthesia and abdominal surgery complications. - Involves **mucosal stripping** and **muscle plication** through the anus, making it safer for elderly or frail patients with **complete rectal prolapse**. *Frykman-Goldberg procedure* - **Abdominal approach** requiring **general anesthesia** and laparotomy, unsuitable for high-risk patients. - Combines **posterior mesh fixation** with **sigmoid resection**, carrying higher perioperative risks. *Well's procedure* - **Transabdominal approach** with **anterior sling** and **sigmoid resection**, requiring general anesthesia. - Higher morbidity and mortality risk compared to perineal procedures in **elderly high-risk** patients. *Ripstein procedure* - **Abdominal approach** using **posterior mesh wrap** around the rectum, requiring general anesthesia. - Risk of **mesh erosion** and **constipation** due to rectal constriction, plus unsuitable for high anesthetic risk patients.

Q: Common sites for Cushing ulcers include all of the following except?

Distal duodenum. **Explanation:** **Cushing ulcers** are stress-induced gastrointestinal ulcers specifically associated with **increased intracranial pressure (ICP)**, head trauma, or brain surgery. The underlying pathophysiology involves the stimulation of the **vagus nerve** nuclei due to elevated ICP. This leads to hypersecretion of gastric acid (HCl) via increased acetylcholine release, which overwhelms the mucosal defenses. Unlike Curling ulcers (associated with burns), which are typically found in the duodenum, Cushing ulcers are more prone to **perforation** and can occur at multiple levels of the upper gastrointestinal tract. **Analysis of Options:** * **Distal Duodenum (Correct Answer):** Cushing ulcers typically involve the **Esophagus, Stomach, and the First part of the Duodenum**. They rarely, if ever, extend to the distal (third or fourth) parts of the duodenum. * **Esophagus (Incorrect):** This is a recognized site for Cushing ulcers due to the high acid reflux and vagal overstimulation. * **Stomach (Incorrect):** The stomach is the most common site for these ulcers. * **First part of Duodenum (Incorrect):** This is a frequent site for stress-related ulceration, similar to peptic ulcer disease. **High-Yield Clinical Pearls for NEET-PG:** * **Cushing vs. Curling:** Remember **C**ushing = **C**NS (Brain) and **C**urling = **C**ooked (Burns). * **Pathogenesis:** Cushing ulcers are caused by **hyperacidity** (vagal stimulation), whereas Curling ulcers are primarily due to **mucosal ischemia** (hypovolemia). * **Morphology:** Cushing ulcers are often deep and have a higher incidence of perforation compared to other stress ulcers. * **Prophylaxis:** Proton Pump Inhibitors (PPIs) or H2 blockers are standard in ICU settings to prevent these complications.

Question 1

Which of the following statements regarding Crohn's disease is correct?

Accepted Answer

Medical management includes antibiotics, immunosuppressive agents, and biologic agents.

Answer

Crohn's disease has no increased risk for colonic cancer.

Answer

Crohn's disease has no effect on fertility.

Answer

An associated enteroenteric fistula is an indication for urgent surgery.

Question 2

Duodenal ulcer is most commonly caused by:

Accepted Answer

H. pylori

Answer

GERD

Answer

NSAID therapy

Answer

Stress ulcer

Question 3

What is the best treatment for a refractory peri-anal fistula in Crohn's disease?

Accepted Answer

Infliximab

Answer

Fistulectomy

Answer

Olasalizine

Answer

Mesalamine

Question 4

A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

Accepted Answer

Delorme procedure

Answer

Frykman-Goldberg procedure

Answer

Well's procedure

Answer

Ripstein procedure

Question 5

What is meant by the Mc stages of colon cancer?

Accepted Answer

Extension up to serosa and lymph node involvement.

Answer

Hepatic metastasis.

Answer

Extension up to serosa.

Answer

Extension up to mucosa.

Question 6

A 30-year-old female presents with progressive dysphagia for both solids and liquids, and heartburn. The symptoms have been worsening over the past few months, accompanied by a significant weight loss of 6 kg in 2 months. Barium swallow revealed a bird beak deformity. What is the most likely diagnosis?

Accepted Answer

Achalasia due to non-relaxing lower esophageal sphincter

Answer

Achalasia due to atrophy and sclerosis of the distal two thirds of the esophagus

Answer

Esophageal stricture due to chronic acid reflux

Answer

Esophageal spasm

Question 7

Which of the following veins is NOT involved in the formation of gastric varices?

Accepted Answer

Splenic vein

Answer

Coronary vein

Answer

Right gastroepiploic vein

Answer

Short gastric vein

Question 8

Common sites for Cushing ulcers include all of the following except?

Accepted Answer

Distal duodenum

Answer

Esophagus

Answer

Stomach

Answer

First part of duodenum

Question 9

What is the primary risk associated with acute mechanical large bowel obstruction that necessitates early surgical intervention?

Accepted Answer

Development of a closed-loop obstruction leading to cecal perforation

Answer

Respiratory compromise secondary to abdominal distension

Answer

Fluid and electrolyte derangements resulting from vomiting

Answer

Bacteremia or sepsis originating from intestinal contents

Question 10

Which type of malignancy is most commonly associated with an anorectal fistula?

Accepted Answer

Squamous cell carcinoma

Answer

Transitional cell carcinoma

Answer

Adenocarcinoma

Answer

Columnar cell carcinoma

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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