Gastrointestinal Surgery Practice Questions

Q: What is the most common cause of posterior duodenal ulcer bleeding name the artery involved?

Gastroduodenal artery. ***Gastroduodenal artery*** - Posterior duodenal ulcers are notorious for eroding into the **gastroduodenal artery**, which runs posterior to the first part of the duodenum. - This anatomical relationship makes these ulcers prone to **severe, life-threatening hemorrhage** rather than perforation. *Left epiploic artery* - The **left gastroepiploic artery** (also known as the left epiploic artery) typically runs along the greater curvature of the stomach. - It is not anatomically positioned to be affected by ulceration of the posterior duodenum. *Right epiploic artery* - The **right gastroepiploic artery** also runs along the greater curvature of the stomach and is a branch of the gastroduodenal artery. - While it branches from the gastroduodenal system, it is not the specific vessel eroded by posterior duodenal ulcers. *Intercostal artery* - **Intercostal arteries** are located within the thoracic cavity, beneath the ribs, and are completely unrelated to the anatomy of the duodenum. - These vessels are primarily involved in chest wall injuries or thoracic surgical procedures, not peptic ulcer disease.

Q: In which type of constipation are stimulant laxatives contraindicated or should be avoided?

Spastic constipation. ***Spastic constipation*** - In this condition, the bowel hyperactivates causing **painful spasms** and cramping; therefore, **stimulant laxatives** are contraindicated as they increase peristalsis and worsen the spasm. - Management typically involves **antispasmodics** and dietary adjustments rather than motility-enhancing agents. *Habitual constipation* - This type results from poor dietary habits and ignoring the urge to defecate, often requiring **lifestyle modifications** such as increased fiber and fluid intake. - Mild stimulant laxatives may sometimes be used as a last resort, but they are not the primary treatment of choice. *Atonic constipation* - This presents with a **hypotonic colon** characterized by sluggish motility, where stimulant laxatives can be beneficial to promote movement. - It is often associated with aging, chronic laxative abuse, or neurological disorders where the bowel lacks the tone to propel contents. *Post-operative constipation* - Often caused by **anesthesia** or **post-surgical ileus**, which requires careful management of intestinal motility. - While caution is advised to prevent bowel perforation, stimulant laxatives are sometimes cautiously used if there is no evidence of obstruction.

Q: Which of the following clinical features best distinguishes mechanical small bowel obstruction from paralytic ileus?

Colicky abdominal pain. ***Colicky abdominal pain*** - In **mechanical small bowel obstruction (SBO)**, the bowel proximal to the obstruction undergoes vigorous peristaltic contractions in an attempt to overcome the lumen blockage, resulting in characteristic **high-pitched** and periodic **colicky pain**. - Conversely, a **paralytic ileus** is marked by a complete cessation of peristaltic activity due to neurogenic or myogenic failure, resulting in an abdomen that is typically silent, without the peristaltic rushes that cause severe colicky pain. *Tachycardia* - **Tachycardia** is a non-specific sign and a common clinical finding in both **mechanical SBO** and **paralytic ileus**, often secondary to dehydration, electrolyte imbalances, or systemic distress. - Because it can occur in both conditions as a result of hypovolemia or metabolic disturbance, it does not serve as a reliable differentiating feature. *Vomiting* - **Vomiting** is a hallmark symptom of both conditions, occurring as bowel contents accumulate proximal to the obstruction or as the gut fails to propel contents forward in an ileus. - While the severity may vary based on the level of obstruction, it does not reliably distinguish between the two entities on its own. *Abdominal distension* - **Abdominal distension** is a generalized sign of both **SBO** and **paralytic ileus**, occurring as air and fluid accumulate within the non-propulsive or obstructed bowel segments. - It is a common clinical finding in any setting of bowel dysfunction and cannot be used to differentiate the mechanical cause from the functional motility failure of an ileus.

Q: A 55-year-old patient presents to the emergency department with abdominal pain, distension, and vomiting. Imaging confirms a diagnosis of cecal volvulus. Which of the following risk factors is responsible for 50-70% of cecal volvulus cases?

Previous abdominal surgery. ***Previous abdominal surgery*** - **Previous abdominal surgery** is the most common predisposing factor for cecal volvulus, as resulting **adhesions** create a fixed point around which the cecum can twist. - Between 50% and 70% of patients diagnosed with this condition have a history of prior operative procedures on the abdomen. *High-fiber diet* - While high fiber intake can influence bowel motility, it is not a primary established risk factor for the mechanical torsion seen in a volvulus. - Dietary factors are generally more associated with conditions like diverticulosis rather than volvulus formation. *Lactulose abuse* - Lactulose administration can cause bowel distension and gas but is not a recognized direct cause of anatomic volvulus. - It is typically used for hepatic encephalopathy or constipation and has no documented link to the high incidence rates requested. *Female sex* - While age and certain anatomical variations may correlate, female sex is not the causative risk factor responsible for the majority of cases. - Cecal volvulus is frequently associated with a congenital **hypermobile cecum** (lack of peritoneal attachment), which is an anatomical predisposition rather than gender-dependent.

Q: A 40-year-old male with a history of progressive dysphagia for liquids presents with a dilated esophagus on barium meal. What is the most likely cause?

Achalasia cardia. ### Explanation **1. Why Achalasia Cardia is the Correct Answer:** Achalasia cardia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis. The hallmark clinical feature is **progressive dysphagia**, which classically begins with **liquids** or occurs for both solids and liquids simultaneously (unlike malignancy, which starts with solids). Over time, the functional obstruction leads to massive proximal dilatation of the esophagus, often referred to as a **"Sigmoid Esophagus"** or **"Mega-esophagus."** On a barium meal, this appears as a dilated esophageal body with a smooth, tapered narrowing at the GE junction, known as the **"Bird’s Beak"** or **"Rat-tail"** appearance. **2. Why the Other Options are Incorrect:** * **Options B, C, and D (Malignancies):** In esophageal or gastric cancers, dysphagia is typically **progressive for solids first**, only progressing to liquids in advanced stages. While these can cause proximal dilatation, it is rarely as massive or "mega-esophageal" as seen in long-standing achalasia. Furthermore, the narrowing in malignancy is usually irregular or "shouldered" (Apple-core appearance) rather than the smooth tapering seen in achalasia. **3. Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal **Manometry** (shows incomplete LES relaxation and aperistalsis). * **Initial Investigation:** Barium Swallow. * **To Rule Out Pseudo-achalasia:** Upper GI Endoscopy (essential to exclude malignancy at the cardia). * **Treatment of Choice:** Laparoscopic Heller’s Myotomy with partial fundoplication (Dor or Toupet). * **Pharmacotherapy:** Isosorbide dinitrate or Nifedipine (least effective, used in surgical non-candidates).

Q: All of the following are causes of pneumoperitoneum except?

Hirschsprung's disease. **Explanation:** **Pneumoperitoneum** refers to the presence of free air within the peritoneal cavity, most commonly caused by the perforation of a hollow viscus. **Why Hirschsprung’s Disease is the correct answer:** Hirschsprung’s disease is a functional bowel obstruction caused by the absence of ganglion cells in the distal colon. While it leads to massive bowel dilatation (**megacolon**), the bowel wall typically remains intact. Therefore, it presents with **pneumatosis intestinalis** (air within the bowel wall) or massive distension, but not pneumoperitoneum, unless a secondary complication like enterocolitis leads to a perforation (which is rare compared to the primary pathology). **Analysis of Incorrect Options:** * **Perforated Peptic Ulcer:** This is the **most common cause** of spontaneous pneumoperitoneum. Gastric or duodenal contents and air escape into the peritoneal cavity. * **Laparoscopic Procedure:** This is a cause of **iatrogenic pneumoperitoneum**. Carbon dioxide (CO2) is intentionally insufflated into the abdomen to create a working space. Residual air can persist for several days post-surgery. * **Perforated Appendix:** While less common than peptic ulcers (due to the appendix often being walled off by the omentum), a free perforation of the appendix can release intraluminal gas into the peritoneum. **NEET-PG High-Yield Pearls:** * **Most sensitive sign:** Air under the right diaphragm on an erect X-ray chest (can detect as little as 1–2 ml of air). * **Left Lateral Decubitus View:** The preferred position if the patient cannot stand; air is seen over the liver shadow. * **Rigler’s Sign:** Seeing both sides of the bowel wall due to free intraperitoneal air. * **Football Sign:** A large radiolucency outlining the entire peritoneal cavity in massive pneumoperitoneum (common in neonates).

Question 1

What is the most common cause of posterior duodenal ulcer bleeding name the artery involved?

Accepted Answer

Gastroduodenal artery

Answer

Left epiploic artery

Answer

Right epiploic artery

Answer

Intercostal artery

Question 2

In which type of constipation are stimulant laxatives contraindicated or should be avoided?

Accepted Answer

Spastic constipation

Answer

Habitual constipation

Answer

Atonic constipation

Answer

Post-operative constipation

Question 3

Which of the following clinical features best distinguishes mechanical small bowel obstruction
from paralytic ileus?

Accepted Answer

Colicky abdominal pain

Answer

Tachycardia

Answer

Vomiting

Answer

Abdominal distension

Question 4

A 55-year-old patient presents to the emergency department with abdominal pain, distension,
and vomiting. Imaging confirms a diagnosis of cecal volvulus. Which of the following risk factors is
responsible for 50-70% of cecal volvulus cases?

Accepted Answer

Previous abdominal surgery

Answer

High-fiber diet

Answer

Lactulose abuse

Answer

Female sex

Question 5

A 52-year-old male with a known history of peptic ulcer disease presents to the emergency department with sudden-onset severe epigastric pain described as 'like being stabbed', now spreading across the entire abdomen. He is lying completely still, has board-like rigidity on examination, and his vital signs show BP 118/76 mmHg, HR 92/min, RR 18/min, SpO2 98% on room air. He takes NSAIDs regularly for chronic back pain. His erect chest X-ray is shown (Image 1). After establishing IV access, sending bloods, and commencing IV fluids and analgesia, what is the most appropriate next step in management?

Accepted Answer

C. Emergency laparotomy with peritoneal lavage and primary repair

Answer

A. Urgent upper GI endoscopy to identify and clip the bleeding vessel

Answer

B. CT abdomen with IV contrast to confirm the source of perforation before intervention

Answer

D. Nasogastric tube insertion, IV proton pump inhibitor infusion, and conservative management for 24 hours

Question 6

A 70-year-old man with atrial fibrillation presents with severe periumbilical pain out of proportion to physical findings, bloody diarrhoea, and a markedly elevated serum lactate. He is haemodynamically unstable despite initial resuscitation. A CECT abdomen is shown (Image 2). Which of the following best describes the most appropriate operative strategy for this patient?

Accepted Answer

A. Damage control laparotomy with resection of non-viable bowel, leaving bowel in discontinuity, and planned relook at 24–48 hours

Answer

B. Emergency laparotomy with resection of non-viable bowel and primary anastomosis in the same sitting

Answer

C. Emergency catheter-directed thrombolysis via superior mesenteric artery angiography before any surgical intervention

Answer

D. Systemic anticoagulation with unfractionated heparin infusion and reassessment of bowel viability at 6 hours

Question 7

A 55-year-old man with a known history of peptic ulcer disease presents with sudden-onset severe epigastric pain that has now spread across the entire abdomen. On examination, the abdomen is board-like rigid and bowel sounds are absent. He is tachycardic and diaphoretic. His BP is 94/60 mmHg. An erect abdominal X-ray is shown (Image 1). After securing IV access and initiating fluid resuscitation, what is the most appropriate next step in management?

Accepted Answer

A. Proceed to emergency exploratory laparotomy after adequate resuscitation

Answer

B. Perform urgent upper GI endoscopy to identify and treat the bleeding source

Answer

C. Administer IV proton pump inhibitor infusion and arrange urgent CT abdomen

Answer

D. Insert a nasogastric tube for decompression and observe for 24 hours

Question 8

A 40-year-old male with a history of progressive dysphagia for liquids presents with a dilated esophagus on barium meal. What is the most likely cause?

Accepted Answer

Achalasia cardia

Answer

Cancer at the cardia

Answer

Carcinoma of the esophagus

Answer

Carcinoma of the gastric fundus

Question 9

All of the following are causes of pneumoperitoneum except?

Accepted Answer

Hirschsprung's disease

Answer

Perforated peptic ulcer

Answer

Laparoscopic procedure

Answer

Perforated appendix

Question 10

Which of the following statements about duodenal adenocarcinoma is correct?

Accepted Answer

It is the most common small bowel carcinoma.

Answer

It is a periampullary carcinoma.

Answer

Jaundice and anemia are the most common symptoms.

Answer

Local resection is curative.

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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