Gastrointestinal Surgery Practice Questions

Q: Which is the commonest post-splenectomy infection?

Streptococcus pneumoniae. ### Explanation **Correct Answer: C. Streptococcus pneumoniae** The spleen plays a critical role in the immune system by filtering blood-borne pathogens and producing opsonins (like tuftsin and properdin). It is particularly vital for clearing **encapsulated organisms** via splenic macrophages. Post-splenectomy, patients are at a lifelong risk of **Overwhelming Post-Splenectomy Infection (OPSI)**. * **Streptococcus pneumoniae** is the most common causative organism, accounting for approximately **50–90%** of OPSI cases. It is an encapsulated, Gram-positive coccus that requires splenic opsonization for effective clearance. * Other significant pathogens include *Haemophilus influenzae* type b and *Neisseria meningitidis*. **Why other options are incorrect:** * **Streptococcus pyogenes (A):** While a common cause of skin and soft tissue infections, it is not an encapsulated organism typically associated with the specific immune deficit seen after splenectomy. * **Staphylococcus aureus (B):** Though a frequent cause of hospital-acquired infections, it does not specifically exploit the loss of splenic filtration and opsonization functions. * **Pseudomonas aeruginosa (D):** This is a common opportunistic pathogen in neutropenic or cystic fibrosis patients, but it is not the primary threat in the post-splenectomy state. **Clinical Pearls for NEET-PG:** 1. **Timing of Vaccination:** To maximize antibody response, vaccines (Pneumococcal, Meningococcal, and Hib) should be given **2 weeks before** elective splenectomy or **2 weeks after** emergency splenectomy. 2. **OPSI Mortality:** OPSI is a medical emergency with a mortality rate of up to 50–70%. 3. **Prophylaxis:** Daily oral penicillin prophylaxis is often recommended, especially in children, for at least two years post-surgery or until age 5. 4. **Howell-Jolly Bodies:** Their presence on a peripheral smear is a classic sign of splenic dysfunction or absence.

Q: A 35-year-old male with a six-year history of chronic duodenal ulcer presents with worsening of symptoms, loss of periodicity, pain on rising in the morning, a sense of epigastric bloating, and post-prandial vomiting. What is the most likely cause of the worsening of his symptoms?

Gastric outlet obstruction. **Explanation:** The patient’s clinical presentation is classic for **Gastric Outlet Obstruction (GOO)**, a known complication of chronic duodenal ulcers. **Why the correct answer is right:** 1. **Loss of Periodicity:** Chronic peptic ulcer disease (PUD) typically features "periodicity" (pain that comes and goes). When pain becomes constant, it suggests a complication like obstruction or penetration. 2. **Vomiting & Bloating:** Post-prandial vomiting (often containing undigested food eaten hours prior) and epigastric fullness are hallmark signs of mechanical obstruction at the pylorus or duodenum due to cicatrization (scarring). 3. **Pain on rising:** In GOO, the stomach fails to empty overnight. The accumulation of gastric secretions and undigested food leads to distension and pain by morning. **Why incorrect options are wrong:** * **Posterior penetration:** This typically presents with pain radiating to the back that is not relieved by antacids. It does not cause the characteristic vomiting seen here. * **Carcinoma:** While gastric cancer can cause GOO, it is extremely rare in the duodenum. Given the 6-year history of duodenal ulcer, benign cicatricial stenosis is far more likely. * **Pancreatitis:** This presents with acute, severe epigastric pain radiating to the back, often with elevated amylase/lipase, rather than chronic obstructive symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Profile:** GOO leads to **Metabolic Alkalosis (Hypochloremic, Hypokalemic)** with **Paradoxical Aciduria**. * **Physical Exam:** Look for a **Succussion Splash** (heard 3+ hours after a meal) and visible gastric peristalsis (left to right). * **Management:** Initial steps include "drip and suck" (NG decompression and IV fluids). The definitive surgical treatment of choice for cicatricial GOO is often **Truncal Vagotomy with Gastrojejunostomy** or Antrectomy.

Q: Which of the following is NOT a predisposing factor for esophageal cancer?

Esophageal varices. **Explanation:** The correct answer is **Esophageal varices**. Esophageal varices are dilated submucosal veins caused by portal hypertension (most commonly due to liver cirrhosis). While they carry a high risk of life-threatening hemorrhage, they are a vascular pathology and do not involve mucosal dysplasia or chronic inflammation that leads to malignancy. **Why other options are predisposing factors:** * **Tylosis (Howel-Evans Syndrome):** An autosomal dominant condition characterized by hyperkeratosis of palms and soles. It has a near 100% lifetime risk of developing **Squamous Cell Carcinoma (SCC)** of the esophagus. * **Achalasia Cardia:** Chronic stasis of food leads to esophagitis and fermentation, causing chronic mucosal irritation. This increases the risk of **SCC** (typically occurring 15–20 years after symptom onset). * **Barrett's Esophagus:** This is the most significant risk factor for **Adenocarcinoma**. It involves intestinal metaplasia (replacement of squamous epithelium with columnar epithelium) due to chronic GERD. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type worldwide:** Squamous Cell Carcinoma (SCC). * **Most common type in the West/increasing incidence:** Adenocarcinoma. * **Plummer-Vinson Syndrome:** Triad of iron deficiency anemia, glossitis, and esophageal webs; predisposes to SCC of the post-cricoid region. * **Corrosive Injury:** History of lye ingestion increases SCC risk significantly. * **Dietary factors:** Nitrosamines, betel nut chewing, and hot beverages are linked to SCC; Obesity and GERD are linked to Adenocarcinoma.

Q: Anemia is greater following which type of gastric resection?

Billroth II. **Explanation:** Anemia is a common long-term complication of gastric surgery, but it is significantly more prevalent and severe following **Billroth II** reconstruction compared to Billroth I. **Why Billroth II is the correct answer:** The primary reason is the **bypass of the duodenum**. In Billroth II (gastrojejunostomy), the duodenum is excluded from the food stream. Iron is predominantly absorbed in the duodenum and proximal jejunum. By bypassing the primary site of absorption and reducing the time food mixes with gastric acid (which facilitates iron solubility), iron deficiency anemia develops. Furthermore, Billroth II is more frequently associated with **Vitamin B12 deficiency** due to bacterial overgrowth in the afferent loop (Blind Loop Syndrome), which competes for B12, and a lack of intrinsic factor from the resected stomach. **Why other options are incorrect:** * **Billroth I:** This procedure involves a gastroduodenostomy, maintaining the physiological passage of food through the duodenum. Because the duodenal absorptive surface is preserved, iron absorption is more efficient than in Billroth II. * **Options C & D:** These are incorrect because the anatomical reconstruction significantly alters the site and efficiency of nutrient absorption, making the incidence of anemia unequal. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of anemia post-gastrectomy:** Iron deficiency (due to bypassed duodenum and decreased HCl). * **Vitamin B12 deficiency:** Occurs due to loss of parietal cells (Intrinsic Factor) and is more common in total gastrectomy or Billroth II (due to stasis in the afferent limb). * **Dumping Syndrome:** Also more common in Billroth II due to the larger stoma and loss of pyloric regulation. * **Megaloblastic Anemia:** If seen post-gastrectomy, think of B12 deficiency or Folate deficiency (due to poor intake).

Q: A patient with distal gastric carcinoma underwent a procedure. Name the procedure performed.

Roux-en-Y gastrectomy. ***Roux-en-Y gastrectomy*** - The **Y-shaped jejunal limb configuration** creates optimal reconstruction after distal gastrectomy, preventing **bile reflux** and **dumping syndrome**. - **Gold standard** for distal gastric carcinoma, providing excellent **oncological clearance** with improved **functional outcomes**. *Billroth I* - Involves **direct gastroduodenal anastomosis** (gastroduodenostomy) which is **technically challenging** after extensive resection for carcinoma. - High risk of **anastomotic tension** and **bile reflux** due to direct connection to duodenum. *Billroth II* - Creates **gastrojejunal anastomosis** but lacks the **isolated alimentary limb** seen in Roux-en-Y configuration. - Associated with higher rates of **alkaline reflux gastritis** and **dumping syndrome** compared to Roux-en-Y. *Polya's operation* - A **modification of Billroth II** with **end-to-side gastrojejunostomy** but still permits bile reflux. - Lacks the **Y-shaped limb separation** that prevents **biliopancreatic secretions** from reaching the gastric remnant.

Q: Early dumping syndrome is primarily due to which of the following mechanisms?

Presence of osmotically active substances in the jejunum. **Explanation:** Dumping syndrome is a common complication following gastric surgeries (like Billroth I/II or Roux-en-Y gastric bypass) where the pyloric sphincter mechanism is bypassed or destroyed. **Why Option A is Correct:** **Early Dumping Syndrome** occurs within 15–30 minutes of food ingestion. The rapid "dumping" of undigested, **hypertonic (osmotically active) food** into the small intestine (jejunum) creates an osmotic gradient. This draws extracellular fluid from the intravascular compartment into the intestinal lumen. The resulting intestinal distension and vasomotor collapse lead to symptoms like abdominal cramps, diarrhea, tachycardia, and syncope. **Why Other Options are Incorrect:** * **Option B (Reactive Hypoglycemia):** This is the hallmark of **Late Dumping Syndrome** (occurring 1–3 hours post-meal). Rapid glucose absorption causes an exaggerated insulin spike, leading to subsequent hypoglycemia. * **Option C (Hyperglycemia):** While transient hyperglycemia occurs initially in Late Dumping, it is the compensatory hyperinsulinemia that causes the clinical syndrome. * **Option D (Hypertriglyceridemia):** This is not a mechanism involved in dumping syndrome; lipid metabolism is generally unaffected in this acute context. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Primarily clinical; Sigstad’s scoring system or the Oral Glucose Tolerance Test (OGTT) can be used. * **Management:** * **First-line:** Dietary modification (small, frequent, dry meals; high protein/fiber; avoid liquids during meals). * **Medical:** Octreotide (somatostatin analogue) is the most effective drug. * **Surgical:** Conversion to a Roux-en-Y reconstruction is the preferred surgical fix.

Q: What is the most common presenting symptom of carcinoma of the stomach?

Weight loss. **Explanation:** **1. Why Weight Loss is Correct:** Weight loss is the **most common presenting symptom** of gastric carcinoma, occurring in approximately 60–90% of patients. It is primarily caused by a combination of anorexia (loss of appetite), early satiety, and the systemic metabolic effects of malignancy (cachexia). By the time a patient seeks medical attention, the disease is often advanced, making weight loss a hallmark clinical feature. **2. Analysis of Incorrect Options:** * **Bleeding (Option A):** While chronic occult blood loss leading to iron-deficiency anemia is common, gross hematemesis or melena is relatively infrequent (occurring in <15% of cases) and is rarely the primary presenting complaint. * **Obstruction (Option B):** Gastric outlet obstruction (GOO) occurs mainly in distal (antral) tumors. While significant, it is less frequent than generalized weight loss and occurs later in the disease progression. * **Perforation (Option C):** This is a rare complication of gastric cancer (occurring in <5% of cases). It usually presents as an acute abdomen and is associated with a poor prognosis. **3. Clinical Pearls for NEET-PG:** * **Most common site:** The incidence of proximal (cardia) tumors is rising, but the **antrum** remains the most common site overall. * **Most common histological type:** Adenocarcinoma (95%). * **Virchow’s Node:** Left supraclavicular lymphadenopathy (Troisier’s sign) indicates metastatic spread. * **Sister Mary Joseph’s Nodule:** Periumbilical metastasis, signifying advanced disease. * **Investigation of choice:** Upper GI Endoscopy (UGIE) with biopsy. * **Early Gastric Cancer:** Defined as involvement limited to the mucosa or submucosa, regardless of lymph node status. It is often asymptomatic or mimics peptic ulcer disease.

Q: Which Borrmann class describes a linitis plastica?

Borrmann class IV. **Explanation:** The **Borrmann Classification** is the standard system used to describe the macroscopic (gross) appearance of advanced gastric cancer. **Why Borrmann Class IV is Correct:** **Borrmann Class IV** refers to **diffusely infiltrating carcinoma**, also known as **Linitis Plastica** ("leather bottle stomach"). In this type, the tumor cells infiltrate the submucosa and muscularis propria extensively, leading to a thickened, rigid, and non-distensible stomach wall. Unlike other types, there is often no discrete mass or clear margin of ulceration. **Analysis of Incorrect Options:** * **Borrmann Class I (Polypoid):** Describes a circumscribed, solitary, cauliflower-like growth without significant ulceration. * **Borrmann Class II (Ulcerated):** Describes a well-demarcated, "punched-out" ulcer with elevated, distinct borders and no surrounding infiltration. * **Borrmann Class III (Ulcerated-Infiltrative):** This is the **most common type**. It features an ulcerated lesion with poorly defined margins where the tumor infiltrates into the surrounding gastric wall. **Clinical Pearls for NEET-PG:** * **Linitis Plastica** is often associated with **Signet Ring Cell Carcinoma** (Diffuse type in Lauren classification) and carries the worst prognosis among all classes. * On a **Barium Swallow**, linitis plastica presents as a "leather bottle" appearance with a narrow, rigid lumen and loss of peristalsis. * **Lauren Classification** is the histological counterpart: Intestinal type (associated with Class I/II) vs. Diffuse type (associated with Class IV). * **Early Gastric Cancer (EGC)** is defined as involvement limited to the mucosa or submucosa, regardless of lymph node status; the Borrmann classification applies only to **Advanced Gastric Cancer**.

Q: A 70-year-old man presents with a 16-week history of progressive dysphagia and recurrent pneumonia episodes. He also has palpable stony hard neck nodes on examination. What is the most likely diagnosis?

Carcinoma of the esophagus. **Explanation:** The clinical presentation of **progressive dysphagia** in an elderly male (70 years), associated with **stony hard neck nodes** (suggestive of metastatic lymphadenopathy), is a classic "red flag" for malignancy. In this case, **Carcinoma of the Esophagus** is the most likely diagnosis. **Why the correct answer is right:** 1. **Progressive Dysphagia:** Malignant strictures typically cause dysphagia that starts with solids and progresses to liquids as the lumen narrows. 2. **Metastasis:** The presence of "stony hard" neck nodes (likely Virchow’s node or deep cervical nodes) strongly indicates metastatic spread, a hallmark of advanced esophageal cancer. 3. **Recurrent Pneumonia:** This occurs due to chronic aspiration of saliva/food or the development of a **tracheoesophageal fistula**, a common complication of esophageal malignancy. **Why other options are incorrect:** * **Achalasia Cardia:** Typically presents in younger patients with long-standing dysphagia (often paradoxical, for liquids more than solids) and lacks hard lymphadenopathy. * **Diffuse Esophageal Spasm:** Characterized by intermittent chest pain and "corkscrew esophagus" on imaging; it does not cause weight loss or lymphadenopathy. * **Zenker’s Diverticulum:** While it causes dysphagia and aspiration, the neck mass is typically soft, fluctuant, and may gurgle (Boyce sign), rather than being stony hard. **High-Yield Clinical Pearls for NEET-PG:** * **Squamous Cell CA:** Most common worldwide; associated with smoking and alcohol. * **Adenocarcinoma:** Most common in the West; associated with GERD and **Barrett’s Esophagus**. * **Investigation of Choice:** Upper GI Endoscopy (UGIE) with biopsy. * **Staging:** EUS (Endoscopic Ultrasound) is the most accurate for T and N staging.

Question 1

Which is the commonest post-splenectomy infection?

Accepted Answer

Streptococcus pneumoniae

Answer

Streptococcus pyogenes

Answer

Staphylococcus aureus

Answer

Pseudomonas aeruginosa

Question 2

A 35-year-old male with a six-year history of chronic duodenal ulcer presents with worsening of symptoms, loss of periodicity, pain on rising in the morning, a sense of epigastric bloating, and post-prandial vomiting. What is the most likely cause of the worsening of his symptoms?

Accepted Answer

Gastric outlet obstruction

Answer

Posterior penetration

Answer

Carcinoma

Answer

Pancreatitis

Question 3

Which of the following is NOT a predisposing factor for esophageal cancer?

Accepted Answer

Esophageal varices

Answer

Tylosis

Answer

Achalasia

Answer

Barrett's esophagus

Question 4

Anemia is greater following which type of gastric resection?

Accepted Answer

Billroth II

Answer

Billroth I

Answer

Both are equal

Answer

Neither is greater

Question 5

A patient with distal gastric carcinoma underwent a procedure. Name the procedure performed.

Accepted Answer

Roux-en-Y gastrectomy

Answer

Billroth I

Answer

Billroth II

Answer

Polya's operation

Question 6

Early dumping syndrome is primarily due to which of the following mechanisms?

Accepted Answer

Presence of osmotically active substances in the jejunum

Answer

Reactive hypoglycemia

Answer

Hyperglycemia

Answer

Hypertriglyceridemia

Question 7

What is the most common presenting symptom of carcinoma of the stomach?

Accepted Answer

Weight loss

Answer

Bleeding

Answer

Obstruction

Answer

Perforation

Question 8

Which Borrmann class describes a linitis plastica?

Accepted Answer

Borrmann class IV

Answer

Borrmann class I

Answer

Borrmann class II

Answer

Borrmann class III

Question 9

While performing a radical gastrectomy for a 2 x 2 cm antral adenocarcinoma, which of the following structures is NOT typically removed?

Accepted Answer

Lymph nodes along the left gastric, common hepatic, and splenic arteries

Answer

Distal two-thirds of the stomach with a one-centimeter cuff of the duodenum

Answer

Lesser and greater omentum

Answer

Spleen

Question 10

A 70-year-old man presents with a 16-week history of progressive dysphagia and recurrent pneumonia episodes. He also has palpable stony hard neck nodes on examination. What is the most likely diagnosis?

Accepted Answer

Carcinoma of the esophagus

Answer

Achalasia Cardia

Answer

Diffuse esophageal spasm

Answer

Zenker's diverticulum

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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