Gastroenterology Practice Questions

Q: Portocaval encephalopathy is treated with

Lactulose. ***Lactulose*** - **Lactulose** is a non-absorbable disaccharide that is metabolized by colonic bacteria, producing organic acids that **lower colonic pH**. - This acidic environment promotes the conversion of ammonia (NH3) to the non-absorbable ammonium ion (NH4+), which is then trapped in the colon and excreted in feces, thereby **reducing systemic ammonia levels**. [1] *Diuretics* - While diuretics are used in liver disease to manage **fluid retention** and **ascites**, they do not directly treat the underlying encephalopathy by removing nitrogenous waste. - In fact, some diuretics (e.g., loop diuretics) can exacerbate encephalopathy by causing **hypokalemia** and **alkalosis**, which favor the diffusion of ammonia into the central nervous system. *Large amount of amino acids* - A large intake of regular dietary **amino acids**, particularly aromatic amino acids, can actually worsen hepatic encephalopathy by increasing the production of nitrogenous waste products. [1] - In some cases, specialized amino acid formulations rich in **branched-chain amino acids** (BCAAs) are used, but a large, non-specific amount of amino acids is counterproductive. *Emergency shunt surgery* - Emergency shunt surgery is not a primary treatment for portosystemic encephalopathy and is generally reserved for managing **acute variceal bleeding** that cannot be controlled endoscopically. - While shunts can prevent recurrent variceal bleeding, they can also **worsen encephalopathy** by diverting more portal blood directly into the systemic circulation, bypassing the liver and increasing the exposure of the brain to toxins. [1]

Q: On esophageal manometry, spastic contractions in the esophageal body with a distal contractile integral (DCI) >8000 mmHg*s*cm are diagnostic of:

Type III achalasia. ***Type III achalasia*** - This diagnosis is characterized by the presence of **spastic contractions** in the esophageal body, specifically with a **distal contractile integral (DCI) greater than 8000 mmHg*s*cm**, alongside the classic features of achalasia (impaired LES relaxation and absent peristalsis) [1]. - The elevated DCI reflects the **premature and simultaneous contractions** that are hallmark of this subtype, distinguishing it from other motility disorders [1]. *Jackhammer esophagus* - While it also involves very strong esophageal contractions (**high DCI**), jackhammer esophagus (also known as hypercontractile esophagus) does **not present with impaired LES relaxation or absent peristalsis** as seen in achalasia. - The defining feature of jackhammer esophagus is **multiple rapid swallows** (MRS) that induce simultaneous contractions, often with very high vigor. *Type II achalasia* - This type of achalasia is defined by **pan-esophageal pressurization** in more than 20% of swallows, along with impaired LES relaxation and absent peristalsis. - Unlike Type III, it does **not show the spastic hypercontractile activity** in the esophageal body revealed by a very high DCI. *Type I achalasia* - This is the classic form of achalasia characterized by **absent esophageal peristalsis** and **impaired lower esophageal sphincter (LES) relaxation**, without significant esophageal pressurization or spastic contractions [1]. - It represents the most common subtype and lacks the **high DCI spastic activity** seen in Type III achalasia.

Q: Patient presented with diarrhoea, poor appetite and malabsorption. His duodenal biopsy was taken which showed crypt hyperplasia, villi atrophy and infiltration of CD8+ T cells in the epithelium. What is the likely diagnosis of the patient?

Celiac disease. ***Celiac disease*** - The combination of **diarrhoea**, **malabsorption**, **villi atrophy**, **crypt hyperplasia**, and **CD8+ T-cell infiltration** in the duodenal epithelium is pathognomonic for celiac disease [1]. - This condition is triggered by **gluten ingestion**, leading to an immune-mediated enteropathy [1], [3]. *Whipple disease* - Characterized by **malabsorption**, fever, arthralgia, and neurological symptoms [2]. - Histologically, it shows **foamy macrophages** containing PAS-positive material (Tropheryma whipplei) in the lamina propria, not primarily CD8+ T-cell infiltration [2]. *Environmental enteropathy* - Also known as tropical enteropathy, it causes **villi atrophy** and malabsorption, particularly in individuals living in areas with poor sanitation. - However, the prominent feature is often a diffuse inflammatory infiltrate, and specific **CD8+ T-cell infiltration** in the epithelium is not as specific as in celiac disease. *Pancreatitis* - Presents with **abdominal pain**, nausea, and vomiting, and can lead to malabsorption due to pancreatic enzyme insufficiency. - Histology of the duodenum would typically be normal, as the pathology primarily involves the **pancreas**, not the duodenal mucosa itself.

Q: All of the following are true about ulcerative colitis except:

Steroid dependent cases need surgery. ***Steroid dependent cases need surgery*** - While **steroid dependency** in ulcerative colitis (UC) indicates a need for alternative or escalate medications, it does not automatically necessitate surgery [1]. - Many steroid-dependent patients can be managed effectively with **immunomodulators** or **biologic therapies**, avoiding surgery. *Surgery is required in a subset of severe cases.* - **Severe ulcerative colitis** that is refractory to medical therapy, or complicated by toxic megacolon, perforation, or severe bleeding, often requires surgical intervention [1]. - This statement is true, as surgery can be curative for UC by removing the affected colon [1]. *Extra-intestinal problems of UC are managed medically* - **Extra-intestinal manifestations** of ulcerative colitis, such as arthritis, skin lesions (erythema nodosum), and eye inflammation (uveitis), are typically managed with medications specific to those conditions, often in conjunction with UC treatment [1], [2]. - This statement is true, as these manifestations rarely require surgical intervention themselves. *The highest risk of UC requiring surgery in 1st year* - The risk of surgery in ulcerative colitis is indeed highest in the **first year after diagnosis**, particularly for patients presenting with severe disease. - This initial period often determines the disease course and responsiveness to medical treatment.

Q: Which is the most common site of gastrinoma in MEN 1 syndrome?

Duodenum. ***Duodenum*** - In **MEN 1 syndrome**, gastrinomas (gastrin-secreting tumors) are most commonly found in the **duodenum**, often multiple and small. - This location accounts for a significant majority of gastrinomas, particularly in patients with **Zollinger-Ellison syndrome (ZES)** associated with MEN 1. *Stomach* - While gastrinomas can occasionally be found in the stomach, this is a **much less common site** compared to the duodenum, especially in the context of MEN 1 syndrome. - Gastric gastrinomas are typically associated with conditions like **atrophic gastritis** and **pernicious anemia**, leading to G-cell hyperplasia and often hypergastrinemia, but tend to be less aggressive. *Ileum* - The **ileum** is an **uncommon site** for gastrinomas; these types of neuroendocrine tumors (NETs) are rarely found there. - NETs in the ileum are more typically associated with the secretion of other hormones, such as **serotonin**, leading to carcinoid syndrome, rather than gastrin. *Jejunum* - Gastrinomas in the **jejunum** are also **rare**, similar to the ileum. - While neuroendocrine tumors can arise throughout the small bowel, the jejunum is not a typical or primary location for gastrin-producing tumors within the context of **MEN 1**.

Q: What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?

Stool calprotectin. ***Stool calprotectin*** - **Stool calprotectin** is a reliable biomarker used to differentiate between **Inflammatory Bowel Disease (IBD)** and **Irritable Bowel Syndrome (IBS)**. It's a protein released by neutrophils during intestinal inflammation. - Elevated levels of **calprotectin** strongly suggest **mucosal inflammation** characteristic of IBD (Crohn's disease or ulcerative colitis), while normal levels are typical in IBS, which lacks inflammation [1]. *pain in abdomen* - **Abdominal pain** is a common symptom in both IBS and IBD. In IBS, it's often linked to altered bowel habits and is a key diagnostic criterion [1]. - In IBD, abdominal pain is typically due to inflammation, strictures, or abscesses, but its presence alone does not differentiate the conditions . *Diarrhoea* - **Diarrhea** is a prominent symptom in both IBS and IBD. In IBS, it can be a predominant feature (IBS-D), often associated with urgency [1]. - In IBD, diarrhea is usually due to inflammation disrupting normal absorption and secretion, and it may contain blood or mucus . *Mucus in stools* - The presence of **mucus in stools** can occur in both IBS and IBD. In IBS, it's often present without blood and is generally considered part of altered bowel function [1]. - In IBD, mucus in stools, particularly when accompanied by blood, strongly suggests active intestinal inflammation and mucosal damage .

Q: Which of the following is false about obstructive jaundice?

Unconjugated bilirubin elevation. ***Unconjugated bilirubin elevation*** - In **obstructive jaundice**, the primary issue is the obstruction of bile flow, preventing conjugated bilirubin (which is water-soluble) from entering the GI tract [1]. - This leads to a buildup of **conjugated bilirubin** in the bloodstream, not unconjugated bilirubin, making this statement false [1]. *Pruritus* - **Pruritus**, or itching, is a common symptom of obstructive jaundice due to the accumulation of **bile salts** in the skin. - These bile salts irritate nerve endings, leading to intense itching. *Icterus* - **Icterus**, or jaundice, is the yellow discoloration of the skin and sclera caused by the accumulation of **bilirubin** (primarily conjugated bilirubin in this case) in the tissues [2]. - This is a hallmark sign of both obstructive and non-obstructive jaundice [2]. *Pale stools* - **Pale stools** (acholic stools) are characteristic of obstructive jaundice because **bilirubin** which gives stool its normal brown color, is unable to reach the intestines [1], [2]. - Undigested fats may also contribute to the pale, sometimes greasy appearance of the stool.

Q: Child Pugh score puts patients into three categories of Score A (<7), Score B (7-9) and Score C (10-15). The following is a type of which scale?

Ordinal. ***Ordinal*** - An **ordinal scale** ranks data with a meaningful order, like the Child-Pugh score categories (A, B, C), but the difference between ranks isn't necessarily equal or precisely quantifiable. - While categories reflect increasing severity, the "distance" between A and B may not be the same as between B and C in a strictly numerical sense. *Nominal* - A **nominal scale** categorizes data without any order or ranking, such as blood types (A, B, AB, O) or gender. - The Child-Pugh score categories have an inherent order of severity (A < B < C), making it more than just nominal. *Quantitative* - **Quantitative scales** involve numerical data that can be measured and calculated. - While the Child-Pugh score is derived from quantitative variables, the final categorical output (A, B, C) doesn't allow for arithmetic operations between the categories themselves. *Continuous* - A **continuous scale** can take any value within a given range, like height or weight, allowing for infinite precision. - The Child-Pugh score categories (A, B, C) are discrete and specific ranges, not allowing for infinitely precise intermediate values.

Q: Most common type of gastric cancer is:

Adenocarcinoma. ***Adenocarcinoma*** - **Gastric adenocarcinoma** accounts for over 90% of all gastric cancers, making it overwhelmingly the most common type. - It arises from the glandular cells of the stomach lining. *Lymphoma* - **Gastric lymphoma** is a less common type of gastric malignancy, often originating from mucosa-associated lymphoid tissue (MALT). - While it can occur in the stomach, it represents a small percentage compared to adenocarcinoma. *GIST* - **Gastrointestinal stromal tumors (GISTs)** are mesenchymal tumors that arise from the interstitial cells of Cajal in the GI tract, including the stomach. - They are rare compared to adenocarcinoma. *Carcinoid* - **Gastric carcinoids**, or neuroendocrine tumors, originate from specialized hormone-producing cells in the stomach lining. - They are generally slow-growing and represent a very small fraction of all gastric neoplasms.

Question 1

Portocaval encephalopathy is treated with

Accepted Answer

Lactulose

Answer

Diuretics

Answer

Large amount of amino acids

Answer

Emergency shunt surgery

Question 2

On esophageal manometry, spastic contractions in the esophageal body with a distal contractile integral (DCI) >8000 mmHg*s*cm are diagnostic of:

Accepted Answer

Type III achalasia

Answer

Jackhammer esophagus

Answer

Type II achalasia

Answer

Type I achalasia

Question 3

True statement regarding upper GI bleeds:

Accepted Answer

The most common cause of upper GI bleeds is peptic ulcer disease, not variceal bleeding.

Answer

Upper GI bleeding is defined as bleeding originating proximal to the ampulla of Vater, not the ligament of Treitz

Answer

Endoscopic banding is the first-line treatment for all types of upper GI bleeding

Answer

Rockall score is primarily used for immediate treatment decisions rather than risk stratification

Question 4

Patient presented with diarrhoea, poor appetite and malabsorption. His duodenal biopsy was taken which showed crypt hyperplasia, villi atrophy and infiltration of CD8+ T cells in the epithelium. What is the likely diagnosis of the patient?

Accepted Answer

Celiac disease

Answer

Whipple disease

Answer

Environmental enteropathy

Answer

Pancreatitis

Question 5

All of the following are true about ulcerative colitis except:

Accepted Answer

Steroid dependent cases need surgery

Answer

Surgery is required in a subset of severe cases.

Answer

Extra-intestinal problems of UC are managed medically

Answer

The highest risk of UC requiring surgery in 1st year

Question 6

Which is the most common site of gastrinoma in MEN 1 syndrome?

Accepted Answer

Duodenum

Answer

Stomach

Answer

Ileum

Answer

Jejunum

Question 7

What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?

Accepted Answer

Stool calprotectin

Answer

pain in abdomen

Answer

Diarrhoea

Answer

Mucus in stools

Question 8

Which of the following is false about obstructive jaundice?

Accepted Answer

Unconjugated bilirubin elevation

Answer

Pruritus

Answer

Icterus

Answer

Pale stools

Question 9

Child Pugh score puts patients into three categories of Score A (<7), Score B (7-9) and Score C (10-15). The following is a type of which scale?

Accepted Answer

Ordinal

Answer

Nominal

Answer

Quantitative

Answer

Continuous

Question 10

Most common type of gastric cancer is:

Accepted Answer

Adenocarcinoma

Answer

Lymphoma

Answer

GIST

Answer

Carcinoid

Gastroenterology — MCQs

Gastroenterology — MCQs

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