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.

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

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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