Gastroenterology — MCQs

A 69-year-old man presents with new symptoms of confusion and sleep disturbance. His partner reports a history of cirrhosis due to chronic alcoholism, with abstinence from alcohol for the past 3 months. His medications include nadolol, furosemide, spironolactone, and lactulose. On examination, he is jaundiced. Supine blood pressure is 102/78 mm Hg, and standing blood pressure is 86/64 mm Hg with a heart rate increase from 72 to 100 beats/min. He is afebrile and has an oxygen saturation of 98% on room air. The abdomen is soft with a palpable spleen tip and no ascites. He is disoriented to place and time but moves all four limbs on command. A digital rectal examination reveals dark black stool. Which of the following is the most likely cause?

Q645Medium

All of the following are true for patients with ulcerative colitis associated with primary sclerosing cholangitis (PSC), EXCEPT?

Q646Medium

What is the most likely diagnosis for a finding detected during esophageal endoscopy?

Q647Medium

Which of the following conditions does NOT cause a false positive D-xylose test?

Q648Easy

The characteristic esophageal manometry finding in achalasia cardia is:

Q649Medium

Coomb's positive hemolytic anemia is seen in all of the following conditions except:

Q650Easy

Which of the following is NOT a metabolic complication of cirrhosis?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 641: Which of the following endoscopic findings is suggestive of Crohn's disease in a patient with chronic diarrhea?

A. Transverse ulcer
B. Nodularity
C. Hypertrophic lesions
D. Anorectal lesions (Correct Answer)

Explanation: **Explanation:** Crohn’s disease (CD) is a chronic inflammatory bowel disease characterized by transmural inflammation that can affect any part of the gastrointestinal tract from the mouth to the anus. **Why Anorectal Lesions are correct:** Anorectal involvement is a hallmark feature of Crohn’s disease and is rarely seen in Ulcerative Colitis (UC). These lesions include **perianal fistulae, fissures, skin tags, and anorectal abscesses**. They occur due to the transmural nature of the inflammation, which leads to the formation of sinus tracts. Finding perianal disease in a patient with chronic diarrhea strongly points toward CD over UC [1]. **Analysis of Incorrect Options:** * **A. Transverse ulcers:** In Crohn’s disease, ulcers are typically **longitudinal (serpentine)** or aphthous [1]. When longitudinal ulcers intersect with edematous mucosa, it creates the classic "cobblestone appearance." Transverse ulcers are more characteristic of Intestinal Tuberculosis. * **B. Nodularity:** While the mucosa may appear irregular, "nodularity" is a non-specific finding. In the context of IBD, "pseudopolyps" are more common, particularly in UC during the healing phase [1]. * **C. Hypertrophic lesions:** These are not a classic endoscopic description for CD. CD is characterized by strictures (due to fibrosis) and "skip lesions" (areas of normal mucosa between inflamed segments) [1]. **NEET-PG High-Yield Pearls:** * **Distribution:** CD is "mouth to anus" with **rectal sparing**; UC involves the rectum and moves proximally (continuous) [1]. * **Microscopy:** **Non-caseating granulomas** are pathognomonic for CD (seen in 30% of cases). * **Radiology:** Look for the **"String sign of Kantor"** (terminal ileum narrowing) and "Proud flesh" sign [1]. * **Serology:** CD is associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies), while UC is associated with **p-ANCA**.

Question 642: What is the commonest cause of acute pancreatitis?

A. Biliary calculi (Correct Answer)
B. Alcohol abuse
C. Infective causes
D. Idiopathic causes

Explanation: Explanation: Acute pancreatitis is an inflammatory condition of the pancreas characterized by the premature activation of digestive enzymes [1]. Globally and in India, **Biliary calculi (Gallstones)** are the most common cause, accounting for approximately 40–70% of cases [1]. The mechanism involves the passage of a gallstone into the common bile duct, causing transient or persistent obstruction of the ampulla of Vater. This leads to increased pancreatic ductal pressure and bile reflux, triggering intra-acinar activation of trypsinogen to trypsin, resulting in autodigestion of the gland. **Analysis of Options:** * **Alcohol abuse:** This is the **second most common cause** overall and the most common cause of *chronic* pancreatitis [1]. It typically requires years of heavy intake. * **Infective causes:** Viral infections (e.g., Mumps, Coxsackievirus, HIV) are recognized but rare causes compared to metabolic or mechanical factors [1]. * **Idiopathic causes:** About 10–20% of cases remain idiopathic after initial workup, though many are later attributed to biliary sludge or microlithiasis. **High-Yield Pearls for NEET-PG:** * **Most common cause (Overall):** Gallstones [1]. * **Most common cause (Chronic Pancreatitis):** Alcohol [1]. * **Most common metabolic cause:** Hypertriglyceridemia (typically when levels >1000 mg/dL). * **Drug-induced:** Azathioprine, Sulfonamides, Valproate, and Estrogens are frequently cited. * **Post-ERCP:** Pancreatitis is the most common complication of ERCP (approx. 5% of cases). * **Scoring:** Ranson’s criteria and APACHE II are used to predict severity; however, **C-Reactive Protein (CRP)** is a useful delayed marker of necrosis [1].

Question 643: A 34-year-old female with a history of oral contraceptive pill (OCP) usage presented to the ER with hematemesis, severe acute RUQ abdominal pain, and a history of DVT. Physical evaluation revealed ascites and tender hepatomegaly. What is the most likely cause for these symptoms?

A. Obstruction of the common bile duct
B. Obstruction of the intrahepatic sinusoids
C. Thrombosis of the hepatic artery
D. Thrombosis of the hepatic veins (Correct Answer)

Explanation: The clinical presentation of **RUQ pain, tender hepatomegaly, and ascites** (the classic triad) in a patient with risk factors for hypercoagulability (OCP use and history of DVT) is highly suggestive of **Budd-Chiari Syndrome (BCS)**. **1. Why the Correct Answer is Right:** Budd-Chiari Syndrome is caused by the **obstruction of hepatic venous outflow**, most commonly due to **thrombosis of the hepatic veins** [2] or the suprahepatic inferior vena cava. This leads to increased intrahepatic pressure, sinusoidal congestion, and ischemic damage to hepatocytes. The resulting post-sinusoidal portal hypertension causes rapid accumulation of ascites and painful liver enlargement. OCPs are a well-known prothrombotic risk factor for this condition. **2. Why the Incorrect Options are Wrong:** * **A. Obstruction of the common bile duct:** This typically presents with obstructive jaundice (conjugated hyperbilirubinemia) [3], pale stools, and dark urine. While it causes RUQ pain, it does not cause sudden ascites or a systemic prothrombotic state. * **B. Obstruction of the intrahepatic sinusoids:** This describes **Sinusoidal Obstruction Syndrome (SOS)**, formerly known as Veno-Occlusive Disease [1]. It is typically seen post-bone marrow transplant or after ingestion of pyrrolizidine alkaloids (bush tea), not usually associated with OCP-induced systemic DVT. * **C. Thrombosis of the hepatic artery:** The liver has a dual blood supply (portal vein and hepatic artery). Hepatic artery thrombosis is rare and usually occurs post-liver transplant, leading to biliary complications or fulminant failure, rather than the classic triad of BCS. **Clinical Pearls for NEET-PG:** * **Most common cause (Global):** Hypercoagulable states (e.g., Polycythemia Vera, Factor V Leiden). * **Imaging Gold Standard:** Doppler Ultrasound (initial) or Venography (gold standard). * **Key Finding:** The **Caudate lobe** often undergoes compensatory hypertrophy because it has independent venous drainage directly into the IVC. * **Morphology:** "Nutmeg liver" (congestive hepatopathy) is seen on gross pathology.

Question 644: A 69-year-old man presents with new symptoms of confusion and sleep disturbance. His partner reports a history of cirrhosis due to chronic alcoholism, with abstinence from alcohol for the past 3 months. His medications include nadolol, furosemide, spironolactone, and lactulose. On examination, he is jaundiced. Supine blood pressure is 102/78 mm Hg, and standing blood pressure is 86/64 mm Hg with a heart rate increase from 72 to 100 beats/min. He is afebrile and has an oxygen saturation of 98% on room air. The abdomen is soft with a palpable spleen tip and no ascites. He is disoriented to place and time but moves all four limbs on command. A digital rectal examination reveals dark black stool. Which of the following is the most likely cause?

A. Spontaneous bacterial peritonitis
B. Spironolactone
C. Nadolol
D. Gastrointestinal bleeding (Correct Answer)

Explanation: ### **Explanation** The patient presents with **Hepatic Encephalopathy (HE)**, characterized by confusion, sleep disturbance, and disorientation in the setting of known cirrhosis [1]. In a patient with cirrhosis, HE is rarely a primary event; it is almost always triggered by a precipitating factor. **1. Why Gastrointestinal (GI) Bleeding is the Correct Answer:** The clinical evidence strongly points to GI bleeding as the precipitant: * **Melena:** The digital rectal examination reveals "dark black stool," a classic sign of upper GI bleeding (e.g., esophageal varices or portal hypertensive gastropathy). * **Orthostatic Hypotension:** The drop in systolic BP (>20 mmHg) and significant rise in heart rate upon standing indicate intravascular volume depletion. * **Mechanism of HE:** Blood in the GI tract provides a massive protein load. Bacteria in the gut break down these proteins into **ammonia**, which is absorbed into the portal circulation [1]. A cirrhotic liver cannot detoxify this ammonia, allowing it to cross the blood-brain barrier and cause encephalopathy [1]. **2. Why Other Options are Incorrect:** * **Spontaneous Bacterial Peritonitis (SBP):** While a common trigger for HE, the patient is afebrile, has a soft abdomen without tenderness, and no ascites is present on examination. * **Spironolactone/Furosemide:** Diuretics can cause HE via dehydration or hypokalemia, but they do not explain the presence of melena. * **Nadolol:** While beta-blockers can cause bradycardia or hypotension, they do not cause confusion or melena. In fact, they are used to *prevent* variceal bleeding. **3. NEET-PG High-Yield Pearls:** * **Precipitants of HE (Mnemonic: HE-Fever):** **H**emorrhage (GI bleed), **E**lectrolyte imbalance (hypokalemia), **F**luid loss (diuretics/diarrhea), **E**xcess protein, **V**ariation in sedation (Benzos), **E**xcessive urea (Renal failure), **R**estriction of bowel movements (Constipation). * **First-line Treatment for HE:** Lactulose (converts ammonia to non-absorbable ammonium) and Rifaximin (reduces ammonia-producing gut flora). * **Diagnosis:** HE is a clinical diagnosis. Serum ammonia levels do not always correlate with the severity of symptoms.

Question 645: All of the following are true for patients with ulcerative colitis associated with primary sclerosing cholangitis (PSC), EXCEPT?

A. They may develop biliary cirrhosis.
B. May have a raised alkaline phosphatase.
C. Increased risk of hilar cholangiocarcinoma.
D. PSC resolves after a total colectomy. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the Correct Answer (The Exception):** Primary Sclerosing Cholangitis (PSC) is an **extra-intestinal manifestation** of Inflammatory Bowel Disease (IBD), most commonly Ulcerative Colitis (UC). Unlike some other manifestations (like episcleritis or erythema nodosum) that parallel the activity of the bowel disease, **PSC follows an independent clinical course.** Performing a total colectomy—even if it "cures" the colonic disease [2]—has no impact on the progression of PSC. The biliary destruction continues, often necessitating a liver transplant regardless of the status of the colon. **2. Analysis of Incorrect Options:** * **Option A (Biliary Cirrhosis):** PSC is a chronic cholestatic disease characterized by "onion-skin" fibrosis of the bile ducts. This leads to progressive biliary obstruction, eventually resulting in secondary biliary cirrhosis and portal hypertension. * **Option B (Raised Alkaline Phosphatase):** An elevated serum Alkaline Phosphatase (ALP) is the most common biochemical abnormality in PSC, reflecting the cholestatic nature of the disease [1]. * **Option C (Hilar Cholangiocarcinoma):** Patients with PSC have a significantly increased lifetime risk (up to 10–15%) of developing cholangiocarcinoma, most commonly at the ductal confluence (hilar region). **3. NEET-PG High-Yield Pearls:** * **The "70/70" Rule:** Approximately 70% of patients with PSC have UC, and 70% of PSC patients are male [3]. * **Imaging Gold Standard:** MRCP is the initial diagnostic test of choice, showing the classic **"beaded appearance"** (multifocal strictures and dilations). * **Cancer Risk:** UC patients with PSC have a higher risk of **colorectal cancer** compared to those with UC alone; they require annual screening colonoscopies from the time of PSC diagnosis. * **Antibody:** **p-ANCA** is positive in about 60-80% of PSC cases but is not specific [1].

Question 646: What is the most likely diagnosis for a finding detected during esophageal endoscopy?

A. Adenocarcinoma (Correct Answer)
B. Candidiasis
C. Dieulafoy's lesion
D. Schatzki ring

Explanation: ***Adenocarcinoma*** - Presents as an **irregular ulcerated mass** in the distal esophagus, often arising from **Barrett's esophagus** with intestinal metaplasia. - Endoscopic features include **raised irregular borders**, **friable tissue**, and **luminal narrowing** with potential obstruction. *Candidiasis* - Characterized by **white plaques** or pseudomembranes that can be easily brushed off during endoscopy. - Typically occurs in **immunocompromised patients** and presents with **odynophagia** rather than mass lesions. *Dieulafoy's lesion* - Appears as a **single bleeding point** from a **submucosal arterial vessel** without surrounding mucosal abnormality. - Primarily causes **acute upper GI bleeding** rather than forming visible masses or ulcerative lesions. *Schatzki ring* - Shows a **smooth, thin mucosal ring** at the **gastroesophageal junction** causing intermittent dysphagia. - Appears as a **benign stricture** without irregular borders, ulceration, or mass-like characteristics.

Question 647: Which of the following conditions does NOT cause a false positive D-xylose test?

A. Bacterial overgrowth
B. Renal failure
C. Ascites
D. Celiac sprue (Correct Answer)

Explanation: ### Explanation The **D-xylose absorption test** is used to differentiate between malabsorption caused by mucosal disease (e.g., Celiac sprue) and malabsorption caused by pancreatic insufficiency. D-xylose is a monosaccharide that is absorbed by the proximal small intestine via passive diffusion and does not require pancreatic enzymes. #### Why Celiac Sprue is the Correct Answer In **Celiac sprue**, there is actual destruction of the intestinal villi (mucosal disease) [1]. This leads to decreased absorption of D-xylose, resulting in low levels in the blood and urine. Because this is a **true positive** (the test correctly identifies intestinal malabsorption), it is not considered a "false positive." #### Why the Other Options are Wrong (Causes of False Positives) A "false positive" occurs when the test suggests mucosal disease (low urinary/blood D-xylose) even though the intestinal mucosa is actually intact: * **Bacterial Overgrowth (SIBO):** Bacteria (like *E. coli*) metabolize D-xylose before it can be absorbed, leading to low urinary levels despite a healthy mucosa. * **Renal Failure:** D-xylose is excreted by the kidneys. In renal impairment, the sugar is absorbed normally but cannot be cleared into the urine, leading to falsely low urinary D-xylose levels. * **Ascites:** D-xylose is a water-soluble sugar that can sequester into third-space fluids (ascites or edema), reducing the amount available for renal excretion [2]. #### NEET-PG High-Yield Pearls * **Normal Test:** Suggests Pancreatic Insufficiency (enzymes are missing, but the mucosa can still absorb simple sugars like D-xylose). * **Abnormal Test:** Suggests Mucosal Disease (e.g., Celiac disease, Tropical sprue, Whipple’s disease) [2]. * **Requirement:** Patients must have adequate hydration and normal renal function for the urinary results to be valid. * **Current Status:** In modern practice, the D-xylose test has largely been replaced by serology (Anti-tTG) and endoscopy for Celiac diagnosis, but it remains a classic "favorite" for PG entrance exams [1].

Question 648: The characteristic esophageal manometry finding in achalasia cardia is:

A. Impaired lower esophageal sphincter relaxation and absent peristalsis (Correct Answer)
B. Impaired lower esophageal sphincter relaxation and increased peristalsis
C. Decreased lower esophageal sphincter pressure and absent peristalsis
D. Decreased lower esophageal sphincter pressure and increased peristalsis

Explanation: ### Explanation **Achalasia Cardia** is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of organized peristalsis in the esophageal body [1]. #### 1. Why Option A is Correct The pathophysiology involves the selective loss of **inhibitory neurons** (containing Nitric Oxide and VIP) in the **myenteric (Auerbach’s) plexus** [1]. This leads to two hallmark manometric findings: * **Impaired LES Relaxation:** The LES fails to open completely in response to swallowing (Residual pressure >10 mmHg) [1]. * **Aperistalsis:** The esophageal body shows a complete lack of progressive contractions because the coordinated wave of muscle contraction is lost [1]. #### 2. Analysis of Incorrect Options * **Option B:** Increased peristalsis is not seen in Achalasia. High-amplitude contractions are characteristic of **Nutcracker Esophagus** (Jackhammer esophagus), not Achalasia [2]. * **Option C & D:** Decreased LES pressure (hypotensive LES) is the hallmark of **Gastroesophageal Reflux Disease (GERD)** or Scleroderma, not Achalasia [2]. In Achalasia, the resting LES pressure is typically normal or elevated (hypertensive) [1]. #### 3. NEET-PG High-Yield Pearls * **Gold Standard Investigation:** Esophageal Manometry (High-Resolution Manometry is preferred). * **Barium Swallow Finding:** "Bird’s Beak" appearance (tapering at the GE junction with proximal dilatation) [1]. * **Chicago Classification:** Achalasia is divided into three types; **Type II** (with panesophageal pressurization) is the most common and has the best prognosis. * **Chagas Disease:** Caused by *Trypanosoma cruzi*, it is a common cause of secondary achalasia (Pseudoachalasia). * **Treatment of Choice:** Heller’s Myotomy (often with Dor/Toupet fundoplication) or POEM (Peroral Endoscopic Myotomy).

Question 649: Coomb's positive hemolytic anemia is seen in all of the following conditions except:

A. Alcoholic cirrhosis (Correct Answer)
B. Chronic active hepatitis
C. Primary biliary cirrhosis
D. Primary sclerosing cholangitis

Explanation: The core concept tested here is the association between **Autoimmune Liver Diseases** and **Autoimmune Hemolytic Anemia (AIHA)**. [1] **1. Why Alcoholic Cirrhosis is the correct answer:** Hemolytic anemia in alcoholic cirrhosis is typically **Coombs-negative**. It is usually caused by **Zieve’s Syndrome** (triad of hemolytic anemia, hyperlipidemia, and jaundice) or **Spur Cell Anemia** (acanthocytosis due to abnormal cholesterol loading of the RBC membrane). These are metabolic and mechanical processes, not immune-mediated; hence, the Direct Antiglobulin Test (Coombs) is negative. **2. Why the other options are incorrect:** * **Chronic Active Hepatitis (Autoimmune Hepatitis):** AIH is frequently associated with other autoimmune phenomena. Coombs-positive AIHA is a well-documented extrahepatic manifestation of this condition. [1] * **Primary Biliary Cholangitis (PBC) & Primary Sclerosing Cholangitis (PSC):** Both are immune-mediated cholestatic liver diseases. [1] They are part of the "overlap syndromes" and are associated with various autoimmune markers and conditions, including warm-antibody AIHA (Coombs-positive). [2] **NEET-PG High-Yield Pearls:** * **Zieve’s Syndrome:** Look for a history of heavy alcohol binge, sudden jaundice, and hemolytic anemia with a negative Coombs test. * **Spur Cell Anemia:** Indicates advanced alcoholic liver disease and carries a very poor prognosis. * **Coombs-Positive AIHA** is also associated with SLE, CLL, and drugs like Methyldopa or Penicillin. * **Wilson’s Disease:** A crucial differential for liver failure with hemolytic anemia; however, the hemolysis in Wilson’s is typically Coombs-negative (due to direct toxic effects of copper on RBCs).

Question 650: Which of the following is NOT a metabolic complication of cirrhosis?

A. Hypokalemia
B. Hyponatremia
C. Hypoglycemia
D. Hypoammonemia (Correct Answer)

Explanation: Explanation: In cirrhosis, the liver's metabolic and synthetic functions are severely compromised. The correct answer is **Hypoammonemia** because cirrhosis characteristically leads to **Hyperammonemia**, not low levels. [1] 1. **Why Hypoammonemia is the Correct Answer:** The liver is the primary site for the **Urea Cycle**, which converts toxic ammonia (produced by gut bacteria and protein metabolism) into water-soluble urea for excretion. In cirrhosis, hepatocellular dysfunction and portosystemic shunting prevent this conversion. [1] This results in elevated serum ammonia levels (**Hyperammonemia**), which cross the blood-brain barrier and play a central role in the pathogenesis of **Hepatic Encephalopathy**. [1] 2. **Analysis of Incorrect Options:** * **Hyponatremia:** This is a hallmark of advanced cirrhosis. It is typically **dilutional (hypervolemic) hyponatremia** caused by the non-osmotic release of ADH (Vasopressin) due to splanchnic vasodilation and decreased effective arterial blood volume. * **Hypokalemia:** Frequently seen due to secondary hyperaldosteronism (the liver cannot degrade aldosterone) and the use of loop diuretics (e.g., Furosemide) to manage ascites. [2] * **Hypoglycemia:** The liver is responsible for glycogen storage and gluconeogenesis. In end-stage cirrhosis, the loss of functional hepatocytes leads to a failure in maintaining blood glucose levels during fasting. [3] **High-Yield NEET-PG Pearls:** * **Most common electrolyte abnormality in cirrhosis:** Hyponatremia. * **Precipitant of Hepatic Encephalopathy:** Hypokalemia (it increases renal ammonia production). * **Management of Hyperammonemia:** Lactulose (converts $NH_3$ to non-absorbable $NH_4^+$) and Rifaximin (reduces ammonia-producing gut flora).

Practice by Chapter

Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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