Gastrointestinal Surgery Practice Questions

Q: Gangrene of the intestine is seen in all the following conditions, except:

Tricuspid Valve Endocarditis. ***Tricuspid Valve Endocarditis*** - While vegetations from **tricuspid valve endocarditis** can embolize, they typically affect the **pulmonary circulation** (e.g., pulmonary embolism, septic pulmonary infarcts) due to the venous drainage pattern. - Embolization from the right side of the heart to the systemic circulation (like the mesenteric arteries) is rare unless there's a **patent foramen ovale** or similar intracardiac shunt. - Therefore, tricuspid endocarditis does **NOT** typically cause intestinal gangrene. *Shock* - **Hypoperfusion** during shock leads to a severe reduction in blood flow to the intestines, causing **ischemia**. - Prolonged or severe ischemia can result in **intestinal gangrene** due to tissue death. - This is known as **non-occlusive mesenteric ischemia (NOMI)**. *Mesenteric artery thrombosis* - A **thrombus** in the mesenteric artery directly blocks blood supply to a segment of the intestine. - This abrupt cessation of blood flow leads rapidly to **ischemia and infarction**, resulting in gangrene. - Accounts for approximately 25-30% of acute mesenteric ischemia cases. *Volvulus* - **Volvulus** involves the twisting of a loop of intestine around its mesentery, which constricts and obstructs the mesenteric blood vessels. - This vascular compromise quickly leads to **ischemia and gangrene** of the twisted bowel segment. - Common sites include sigmoid colon and cecum.

Q: In a patient with gastric carcinoma involving the antrum with extensive perigastric and distant lymph node involvement (para-aortic nodes) and poor performance status, what is the most appropriate surgical management option?

Palliative gastrectomy. ***Palliative gastrectomy*** - This option is appropriate when gastric cancer has **distant lymph node metastases (para-aortic nodes - M1 disease)** and poor performance status, indicating **non-curable disease** - The goal is to alleviate symptoms like bleeding, obstruction, or pain to improve **quality of life**, not to achieve cure - **Palliative gastrectomy** removes the primary tumor to prevent complications such as bleeding or obstruction, even when cure is not achievable - Surgery should only be considered if the patient is symptomatic and has adequate performance status to tolerate the procedure *Total radical gastrectomy* - This is the standard curative approach for **resectable gastric cancer**, including those with regional (perigastric) lymph node involvement (N1-N3 disease) - Involves complete tumor resection with clear margins and **D2 lymphadenectomy** for adequate staging and potential cure - However, in this case with **distant nodal metastases (M1 disease)** and poor performance status, radical surgery would not achieve cure and carries high morbidity without proportional survival benefit - Regional lymph node involvement alone does NOT preclude curative surgery, but distant nodal spread and poor performance status do *Gastrojejunostomy* - This bypass procedure relieves **gastric outlet obstruction** without removing the tumor - Indicated when there is pyloric or distal gastric obstruction causing symptoms - Less morbid than gastrectomy but does not address bleeding from the tumor or significant tumor burden - May be preferred over gastrectomy if the patient has very poor performance status and only obstructive symptoms *None of the options* - Incorrect, as one of the surgical options (palliative gastrectomy) is appropriate for this clinical scenario - The choice between palliative resection and bypass depends on symptoms, performance status, and goals of care

Q: The triad of diverticulosis, gallstones, and hiatus hernia is termed as:

Saint's triad. ***Saint's triad*** - This specific combination of **diverticulosis, gallstones, and hiatus hernia** is traditionally known as **Saint's triad**. - It describes the co-occurrence of three common age-related gastrointestinal conditions often seen together. *Beck's triad (hypotension, muffled heart sounds, jugular venous distention)* - **Beck's triad** is characteristic of **cardiac tamponade**, a life-threatening condition where fluid accumulates around the heart, impairing its function. - The presented triad of gastrointestinal conditions is unrelated to cardiac tamponade. *Whipple's triad (neuroglycopenic symptoms, hypoglycemia, improvement after glucose administration)* - **Whipple's triad** is used to diagnose **insulinoma** or other causes of **hypoglycemia** in non-diabetic individuals. - It specifically refers to symptoms related to low blood sugar and their resolution upon glucose administration, not gastrointestinal anatomical issues. *Murphy's triad (abdominal pain, fever, vomiting)* - **Murphy's triad** describes the classical symptoms of **acute appendicitis**. - These are clinical signs of acute inflammation within the abdomen, distinctly different from the chronic anatomical conditions listed in the question.

Q: All of the following can be used as endoscopic sclerosants in the treatment of variceal bleeding, except -

Acetic acid. ***Acetic acid*** - **Acetic acid** is not typically used for endoscopic variceal sclerotherapy due to its potent corrosive nature and high risk of tissue damage. - While it has been explored in experimental settings for superficial lesions (e.g., cervical disease), it is not a standard sclerosant for esophageal varices. *Polydochanol* - **Polydochanol** (or Aethoxysclerol®) is a commonly used sclerosing agent for esophageal varices. - It works by inducing **endothelial damage** and subsequent thrombosis and fibrosis within the varix. *Cyanoacrylate* - **Cyanoacrylate** glue is particularly effective for large **gastric varices** due to its ability to rapidly polymerize and achieve immediate hemostasis. - It directly occludes the varix, preventing rebleeding, and is often preferred for gastric varices where conventional sclerotherapy might be less effective. *Alcohol* - **Absolute alcohol** (ethanol) is a traditional and effective sclerosant for esophageal varices, causing rapid **dehydration** and protein denaturation within the vessel wall. - It leads to immediate thrombosis and subsequent fibrosis of the targeted varices.

Q: After splenectomy, the most common infection is:

Streptococcus pneumoniae. ***Streptococcus pneumoniae*** - The **spleen** is crucial for filtering encapsulated bacteria and producing opsonizing antibodies, making individuals **asplenic** or functionally asplenic highly susceptible to infections by **encapsulated organisms**. - *S. pneumoniae* is the most common cause of **overwhelming post-splenectomy infection (OPSI)**, leading to rapid onset **sepsis** and high mortality. *E. coli* - While *E. coli* is a common cause of infections, particularly **gram-negative sepsis** or **urinary tract infections**, it is not an encapsulated bacterium and thus not the primary opportunistic pathogen post-splenectomy. - The spleen's role in clearing *E. coli* is less central compared to encapsulated organisms. *Klebsiella* - *Klebsiella* species are also encapsulated bacteria, but *S. pneumoniae* is statistically the most frequently implicated organism in OPSI. - While *Klebsiella* can cause severe infections, particularly **pneumonia** and **bacteremia**, it is less common than *S. pneumoniae* in the context of post-splenectomy sepsis. *Haemophilus influenzae* - **Encapsulated strains of *Haemophilus influenzae***, particularly type B (Hib), can cause severe infections in asplenic patients, including **meningitis** and **epiglottitis**. - However, with widespread Hib vaccination, its incidence has significantly decreased, and *Streptococcus pneumoniae* remains the most prevalent cause of OPSI.

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

Adhesions. ***Adhesions*** - **Post-surgical adhesions** are by far the leading cause of **small bowel obstruction** in adults, accounting for approximately 60-80% of cases. - They form as fibrous bands between tissue surfaces after surgery, which can later constrict or twist the bowel. *Ileocaecal tuberculosis* - While it can cause intestinal obstruction due to **stricture formation** and inflammation, it is a much rarer cause, particularly in developed countries. - This condition is more common in immunocompromised individuals or endemic areas. *Carcinoma colon* - **Colorectal cancer** is a common cause of **large bowel obstruction**, but it is less frequent as a cause of overall intestinal obstruction compared to adhesions. - The obstruction typically develops gradually as the tumor grows and narrows the bowel lumen. *Intussusception* - This is a more common cause of intestinal obstruction in **infants and young children**, where one part of the intestine telescopes into another. - In adults, it is a relatively rare cause of obstruction and is often associated with a **lead point** such as a tumor or polyp.

Q: Which type of hernia is commonly associated with hydrocele?

Indirect inguinal hernia. ***Indirect inguinal hernia*** - An **indirect inguinal hernia** occurs when there is a persistent **patent processus vaginalis**, the same embryological structure that can lead to a **hydrocele** if it closes incompletely distally. - Both conditions arise from the failure of the **processus vaginalis** to fully obliterate, allowing abdominal contents (for hernia) or peritoneal fluid (for hydrocele) to enter the inguinal canal or scrotum. *Direct inguinal hernia* - A **direct inguinal hernia** protrudes directly through **Hesselbach's triangle** and is an acquired weakness of the posterior wall of the inguinal canal, not related to the processus vaginalis. - It involves a different anatomical defect and does not share the same developmental origin as a hydrocele. *Femoral hernia* - A **femoral hernia** protrudes through the **femoral canal** below the inguinal ligament, a distinct anatomical pathway from the inguinal canal. - It is more common in women and is not embryologically linked to the formation of a hydrocele. *Umbilical hernia* - An **umbilical hernia** involves a protrusion through the **umbilical ring** due to incomplete closure of the abdominal wall at the umbilicus. - This type of hernia is entirely distinct in its anatomical location and developmental origin from both inguinal hernias and hydroceles.

Question 1

Which of the following is true about Zenker's diverticulum?

Accepted Answer

Treatment options typically include surgical interventions such as diverticulectomy or cricopharyngeal myotomy.

Answer

It is asymptomatic

Answer

Occurs in the mid-esophagus

Answer

It occurs in children

Question 2

Gangrene of the intestine is seen in all the following conditions, except:

Accepted Answer

Tricuspid Valve Endocarditis

Answer

Shock

Answer

Mesenteric artery thrombosis

Answer

Volvulus

Question 3

In a patient with gastric carcinoma involving the antrum with extensive perigastric and distant lymph node involvement (para-aortic nodes) and poor performance status, what is the most appropriate surgical management option?

Accepted Answer

Palliative gastrectomy

Answer

None of the options

Answer

Gastrojejunostomy

Answer

Total radical gastrectomy

Question 4

The triad of diverticulosis, gallstones, and hiatus hernia is termed as:

Accepted Answer

Saint's triad

Answer

Whipple's triad

Answer

Murphy's triad

Answer

Beck's triad

Question 5

Which of the following statements about duodenal diverticula is false?

Accepted Answer

Whenever found, should be treated due to increased risk of complications

Answer

Can cause acute pancreatitis

Answer

Most common site is periampullary region

Answer

Most are asymptomatic

Question 6

All of the following can be used as endoscopic sclerosants in the treatment of variceal bleeding, except -

Accepted Answer

Acetic acid

Answer

Alcohol

Answer

Polydochanol

Answer

Cyanoacrylate

Question 7

After splenectomy, the most common infection is:

Accepted Answer

Streptococcus pneumoniae

Answer

E. coli

Answer

Klebsiella

Answer

Haemophilus influenzae

Question 8

A 45-year-old gentleman has undergone truncal vagotomy and pyloroplasty for bleeding duodenal ulcer seven years ago. Now he has intractable recurrent symptoms of peptic ulcer. All of the following suggest the diagnosis of Zollinger-Ellison syndrome, except:

Accepted Answer

Serum gastrin value of 200 pg/ml with secretin stimulation

Answer

Ulcers in proximal jejunum and lower end of esophagus

Answer

Basal acid output of 15 meq/hour

Answer

Serum gastrin value of 500 pg/ml

Question 9

What is the most common cause of intestinal obstruction?

Accepted Answer

Adhesions

Answer

Ileocaecal tuberculosis

Answer

Carcinoma colon

Answer

Intussusception

Question 10

Which type of hernia is commonly associated with hydrocele?

Accepted Answer

Indirect inguinal hernia

Answer

Umbilical hernia

Answer

Direct inguinal hernia

Answer

Femoral hernia

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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