Gastroenterology — MCQs
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A patient with chronic diarrhea noticed improvement in symptoms after prolonged fasting. What is the most probable diagnosis?
A 48-year-old woman presents with a 3-week history of fatigue and yellow skin and sclerae. Physical examination reveals mild jaundice. Laboratory findings include a serum bilirubin level of 3.7 mg/dL (predominantly unconjugated), normal serum AST, ALT, and alkaline phosphatase, and a hemoglobin level of 6.0 g/dL. Jaundice resolved after administration of corticosteroids. What is the most likely cause of hyperbilirubinemia in this patient?
A 41-year-old patient is diagnosed with infective endocarditis. Which of the following has a good prognosis?
In which of the following conditions does odynophagia occur?
Which of the following is a true statement about unconjugated hyperbilirubinemia?
Which of the following is NOT a predisposing factor for hepatic encephalopathy?
All of the following is true regarding Gastroesophageal Reflux Disease (GERD) except?
Rose spots are seen in which of the following conditions?
Anti-LKM antibody is seen in which condition?
Which of the following statements are true regarding non-alcoholic fatty liver disease?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 381: A patient with chronic diarrhea noticed improvement in symptoms after prolonged fasting. What is the most probable diagnosis?
- A. Inflammatory bowel disease
- B. Irritable bowel syndrome
- C. Diarrhea secondary to lactose malabsorption (Correct Answer)
- D. Enterotoxin-induced diarrhea
Explanation: ### Explanation The key to solving this question lies in distinguishing between **Osmotic** and **Secretory** diarrhea based on the response to fasting. **1. Why Option C is Correct:** Lactose malabsorption causes **Osmotic Diarrhea**. In this condition, unabsorbed solutes (lactose) remain in the intestinal lumen, creating an osmotic gradient that pulls water into the bowel [1]. Since the diarrhea is driven by the ingestion of non-absorbable substances, **fasting (stopping intake) leads to the disappearance of the osmotic load**, thereby resolving the diarrhea [2]. This is a hallmark feature of osmotic diarrhea. **2. Why the other options are incorrect:** * **Option A (IBD):** Inflammatory Bowel Disease involves mucosal inflammation, ulceration, and exudation. While fasting might slightly reduce stool volume, the underlying inflammatory process continues to produce symptoms (exudative diarrhea). * **Option B (IBS):** Irritable Bowel Syndrome is a functional disorder. While symptoms are often meal-related, the diarrhea does not characteristically "stop" simply due to fasting in the same physiological manner as osmotic diarrhea. * **Option D (Enterotoxin-induced):** This is a form of **Secretory Diarrhea** (e.g., Cholera). In secretory diarrhea, enterotoxins stimulate active ion secretion into the lumen. This process is independent of food intake; therefore, **diarrhea persists even during fasting.** **3. High-Yield Clinical Pearls for NEET-PG:** * **Osmotic Gap:** To differentiate, calculate the Stool Osmotic Gap $[290 - 2 \times (Stool\ Na^+ + Stool\ K^+)]$. * **Osmotic Diarrhea:** Gap is **>125 mOsm/kg** (due to unmeasured solutes like lactose). * **Secretory Diarrhea:** Gap is **<50 mOsm/kg**. * **pH:** In carbohydrate malabsorption (like lactose), stool pH is typically **acidic (<5.5)** due to the fermentation of sugars by colonic bacteria into short-chain fatty acids [2]. * **Common Causes of Osmotic Diarrhea:** Lactulose, Magnesium salts, Celiac disease, and Chronic Pancreatitis.
Question 382: A 48-year-old woman presents with a 3-week history of fatigue and yellow skin and sclerae. Physical examination reveals mild jaundice. Laboratory findings include a serum bilirubin level of 3.7 mg/dL (predominantly unconjugated), normal serum AST, ALT, and alkaline phosphatase, and a hemoglobin level of 6.0 g/dL. Jaundice resolved after administration of corticosteroids. What is the most likely cause of hyperbilirubinemia in this patient?
- A. Acute hepatitis B infection
- B. Autoimmune hemolytic anemia (Correct Answer)
- C. Gallstone in the common bile duct
- D. Primary biliary cirrhosis
Explanation: The patient presents with **unconjugated hyperbilirubinemia** (jaundice with normal liver enzymes) and significant **anemia** (Hb 6.0 g/dL). The resolution of jaundice following **corticosteroid therapy** is the diagnostic clincher. [1] **1. Why Autoimmune Hemolytic Anemia (AIHA) is correct:** In AIHA, antibodies cause the premature destruction of red blood cells (hemolysis). This releases a massive load of heme, which is converted into unconjugated bilirubin. The liver's conjugating capacity is overwhelmed, leading to unconjugated hyperbilirubinemia. Since the pathology is pre-hepatic, liver enzymes (AST, ALT, ALP) remain normal [2]. Corticosteroids are the first-line treatment for Warm-AIHA; they suppress the immune-mediated destruction, thereby stopping the hemolysis and resolving the jaundice. **2. Why the other options are incorrect:** * **Acute Hepatitis B:** This would present with conjugated hyperbilirubinemia and a massive elevation of transaminases (AST/ALT), reflecting hepatocellular injury. * **Gallstone (Choledocholithiasis):** This causes obstructive jaundice characterized by conjugated hyperbilirubinemia and significantly elevated Alkaline Phosphatase (ALP) [2]. * **Primary Biliary Cholangitis (PBC):** This is a chronic cholestatic condition. While it is autoimmune, it presents with elevated ALP and GGT, and it does not typically cause sudden severe anemia or respond rapidly to steroids in this manner [3]. **Clinical Pearls for NEET-PG:** * **Isolated Unconjugated Hyperbilirubinemia:** Always differentiate between Hemolysis (low Hb, high Retic count, high LDH) and Gilbert’s Syndrome (normal Hb) [2]. * **Steroid-Responsive Jaundice:** In the context of anemia, think AIHA. In the context of hepatomegaly/raised ALT, think Autoimmune Hepatitis [1]. * **Rule of Thumb:** If AST/ALT/ALP are normal and bilirubin is high, the problem is either **overproduction** (hemolysis) or **impaired conjugation** (Gilbert’s/Crigler-Najjar) [2].
Question 383: A 41-year-old patient is diagnosed with infective endocarditis. Which of the following has a good prognosis?
- A. Prosthetic valve endocarditis
- B. Intravenous drug abuse
- C. Staphylococcus aureus endocarditis
- D. Streptococcus viridans endocarditis (Correct Answer)
Explanation: Infective Endocarditis (IE) prognosis is determined by the virulence of the organism, the type of valve involved, and the presence of complications. **Why Streptococcus viridans is the correct answer:** *Streptococcus viridans* (e.g., *S. mitis*, *S. sanguinis*) is a low-virulence organism that typically causes **subacute infective endocarditis** [1]. It usually affects previously damaged native valves and follows a slow, indolent course. Because it is highly sensitive to Penicillin and rarely causes rapid valvular destruction or embolic phenomena compared to other pathogens, it carries the **best prognosis** among the options provided. **Analysis of Incorrect Options:** * **Prosthetic Valve Endocarditis (PVE):** This carries a high mortality rate (especially early PVE) due to the risk of ring abscesses, valve dehiscence, and the difficulty of eradicating biofilms on foreign material. * **Intravenous Drug Abuse (IVDA):** While right-sided IE (common in IVDA) often has a better prognosis than left-sided IE, these patients frequently present with *S. aureus* or polymicrobial infections and have high rates of recurrence and septic pulmonary emboli [1]. * **Staphylococcus aureus:** This is a highly virulent organism causing **acute infective endocarditis** [1]. It leads to rapid valvular destruction, high fever, and frequent systemic embolic complications, resulting in a poor prognosis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of IE overall:** *Staphylococcus aureus* (now surpassing *S. viridans*) [1]. * **Most common cause of IE in IVDA:** *Staphylococcus aureus* (Tricuspid valve) [1]. * **Culture-negative IE:** Most commonly due to prior antibiotic use; otherwise, consider **HACEK** organisms or *Coxiella burnetii*. * **Duke’s Criteria:** The gold standard for diagnosis (requires 2 major, 1 major + 3 minor, or 5 minor criteria) [3].
Question 384: In which of the following conditions does odynophagia occur?
- A. Achalasia and Herpes esophagitis
- B. Herpes esophagitis and Monilial esophagitis (Correct Answer)
- C. Achalasia, Herpes esophagitis, and Monilial esophagitis
- D. Achalasia, Herpes esophagitis, Monilial esophagitis, and Barrett's esophagus
Explanation: The key to answering this question lies in distinguishing between **dysphagia** (difficulty swallowing) and **odynophagia** (painful swallowing) [1]. **1. Why Option B is Correct:** Odynophagia is a hallmark symptom of **infectious esophagitis**, which causes acute mucosal inflammation and ulceration. * **Monilial (Candidal) esophagitis:** The most common cause of infectious esophagitis, typically seen in immunocompromised patients (HIV/AIDS, malignancy). It presents with white plaques and significant pain on swallowing. * **Herpes esophagitis:** Caused by HSV-1, it leads to "punched-out" ulcers. The raw, ulcerated surface of the esophagus makes the passage of food extremely painful. **2. Why Other Options are Incorrect:** * **Achalasia Cardia:** This is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax [1]. Its primary symptom is **painless dysphagia** for both solids and liquids. While patients may experience chest pain, true odynophagia is not a standard feature [1], [2]. * **Barrett’s Esophagus:** This is a premalignant metaplastic change of the esophageal lining due to chronic GERD [3]. It is usually asymptomatic or presents with symptoms of reflux (heartburn). It does not cause odynophagia unless a deep peptic ulcer or adenocarcinoma develops [1], [3]. **3. NEET-PG High-Yield Pearls:** * **Odynophagia = Mucosal Injury:** Always think of infections (Candida, HSV, CMV), pill-induced esophagitis, or caustic ingestion. * **Dysphagia = Structural/Motility Issue:** Think of Achalasia, Strictures, or Malignancy [1], [2]. * **Drug of Choice:** Fluconazole for Monilial esophagitis; Acyclovir for Herpes esophagitis. * **Endoscopy Finding:** "Cottage cheese" appearance for Candida; "Volcano-like" ulcers for HSV.
Question 385: Which of the following is a true statement about unconjugated hyperbilirubinemia?
- A. Indirect bilirubin constitutes 85% of the total bilirubin.
- B. It is seen in hemolytic anemia.
- C. It is seen when hemoglobin destruction exceeds bilirubin production.
- D. All of the above. (Correct Answer)
Explanation: Unconjugated (indirect) hyperbilirubinemia occurs when there is an excessive production of bilirubin or a defect in its uptake and conjugation by the liver [1]. 1. **Option A:** In normal physiology, unconjugated bilirubin is the predominant form in the blood. In cases of unconjugated hyperbilirubinemia, **indirect bilirubin typically constitutes >80-85% of the total bilirubin**, while the conjugated fraction remains minimal because the liver's conjugating capacity is overwhelmed or impaired. 2. **Option B:** **Hemolytic anemia** is the classic cause of unconjugated hyperbilirubinemia [1]. Rapid breakdown of red blood cells leads to a massive release of heme, which is converted into unconjugated bilirubin [2], exceeding the liver's processing speed. 3. **Option C:** This statement describes the **pathophysiological mechanism**. When hemoglobin destruction (from RBCs) occurs at a rate that exceeds the liver's ability to produce and excrete conjugated bilirubin, the unconjugated form accumulates in the plasma [1]. **Clinical Pearls for NEET-PG:** * **Van den Bergh Reaction:** Unconjugated bilirubin gives an **indirect** reaction, while conjugated bilirubin gives a **direct** reaction. * **Urine Findings:** Unconjugated bilirubin is lipid-soluble and bound to albumin [2]; therefore, it **cannot pass through the glomerulus**. Consequently, there is **no bilirubinuria** (acholuric jaundice). * **Differential Diagnosis:** * *Increased production:* Hemolysis, ineffective erythropoiesis [2]. * *Decreased conjugation:* Gilbert syndrome (mild), Crigler-Najjar syndrome (severe) [3]. * **Key Distinction:** If conjugated bilirubin is >20% of total bilirubin, consider conjugated hyperbilirubinemia (cholestasis or hepatocellular injury).
Question 386: Which of the following is NOT a predisposing factor for hepatic encephalopathy?
- A. Gastrointestinal bleeding
- B. Hypokalemia
- C. Metabolic acidosis (Correct Answer)
- D. Alcohol
Explanation: Hepatic Encephalopathy (HE) is primarily driven by the accumulation of neurotoxins, most notably ammonia ($NH_3$), which crosses the blood-brain barrier [1]. The correct answer is Metabolic Acidosis because it is actually Metabolic Alkalosis that predisposes a patient to HE. Why Metabolic Acidosis is the correct answer: In an acidic environment, ammonia ($NH_3$) reacts with hydrogen ions to form ammonium ($NH_4^+$). Unlike $NH_3$, $NH_4^+$ is charged and cannot easily cross the blood-brain barrier. Therefore, acidosis is generally protective. Conversely, Metabolic Alkalosis shifts the equilibrium toward $NH_3$, facilitating its entry into the brain and worsening encephalopathy. Analysis of Incorrect Options: * Gastrointestinal Bleeding: This is a classic precipitant. Blood in the GI tract provides a massive protein load (hemoglobin), which is broken down by gut bacteria into ammonia. * Hypokalemia: Low potassium levels lead to an intracellular shift of $H^+$ ions, causing extracellular alkalosis. It also stimulates renal ammoniagenesis in the proximal tubules, significantly increasing systemic ammonia levels. * Alcohol: Alcohol acts as a direct CNS depressant and can trigger acute alcoholic hepatitis, further impairing the liver's ability to detoxify ammonia via the urea cycle. High-Yield Clinical Pearls for NEET-PG: * Most common precipitant: Infection (e.g., SBP) and GI bleeding. * Azotemia: Renal failure increases urea levels, which gut bacteria convert into ammonia. * Treatment Logic: Lactulose works by acidifying the gut (converting $NH_3$ to $NH_4^+$) and acting as an osmotic laxative. Rifaximin is added to reduce ammonia-producing gut flora. * Asterixis: The hallmark physical finding (negative myoclonus), though not pathognomonic for HE [2].
Question 387: All of the following is true regarding Gastroesophageal Reflux Disease (GERD) except?
- A. Can present with nocturnal cough.
- B. Bicarbonate secreted by esophageal mucosa neutralizes the acid. (Correct Answer)
- C. Erosive esophagitis at the esophagogastric junction is the hallmark of GERD.
- D. Occurs during transient relaxation of the lower esophageal sphincter (LES).
Explanation: **Explanation:** **Why Option B is the correct answer (Incorrect Statement):** The esophageal mucosa **does not** secrete significant amounts of bicarbonate. Unlike the stomach or duodenum, the esophagus lacks a robust alkaline mucus-bicarbonate barrier. Instead, esophageal protection relies on **salivary bicarbonate**. Swallowed saliva neutralizes residual acid in the esophagus and facilitates its clearance. The lack of intrinsic bicarbonate secretion is why the esophageal epithelium is particularly vulnerable to acid injury. **Analysis of other options:** * **Option A:** GERD is a common cause of **extra-esophageal symptoms**. Acid reflux can trigger a cough reflex via the vagus nerve or through micro-aspiration, often worsening at night when the patient is supine. * **Option C:** The presence of **erosions or mucosal breaks** at the squamocolumnar junction (Z-line) is the definitive endoscopic hallmark of erosive esophagitis, a key subset of GERD. * **Option D:** **Transient Lower Esophageal Sphincter Relaxations (TLESRs)** are the most common pathophysiological mechanism of GERD. These are spontaneous relaxations of the LES that occur independently of swallowing [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** 24-hour ambulatory pH monitoring (specifically the DeMeester score). * **First-line Investigation:** Upper GI Endoscopy (though often normal in Non-Erosive Reflux Disease - NERD). * **Los Angeles (LA) Classification:** Used to grade the severity of erosive esophagitis (Grades A to D) [2]. * **Barrett’s Esophagus:** A premalignant complication where squamous epithelium undergoes **intestinal metaplasia** to specialized columnar epithelium [1].
Question 388: Rose spots are seen in which of the following conditions?
- A. Malaria
- B. Chikungunya fever
- C. Typhoid (Correct Answer)
- D. Tuberculosis
Explanation: **Explanation:** **Typhoid fever (Enteric fever)**, caused by *Salmonella typhi*, is the classic condition associated with **Rose spots**. These are small (2–4 mm), blanching, salmon-pink maculopapules typically found on the chest and abdomen. They appear during the second week of illness [1] in approximately 30% of patients and represent bacterial emboli to the dermis. **Analysis of Options:** * **Malaria:** Presents with a paroxysmal fever pattern, anemia, and splenomegaly. While it can cause jaundice (biliary malaria), it does not typically present with a specific rash like rose spots. * **Chikungunya fever:** Characterized by high fever and severe, often debilitating polyarthralgia. The typical rash is maculopapular and diffuse, appearing early in the disease, unlike the localized rose spots of typhoid. * **Tuberculosis:** A chronic granulomatous infection. While "Lupus vulgaris" or "miliary TB" can have skin manifestations, rose spots are not a feature of any TB variant. **NEET-PG High-Yield Pearls:** * **Timing:** Rose spots appear in the **2nd week** of Typhoid fever [1]. * **Step-ladder pyrexia:** The characteristic fever pattern seen in the 1st week. * **Faget’s Sign:** Relative bradycardia (pulse does not rise proportionately with temperature), a classic finding in Typhoid. * **Diagnosis:** The **Widal test** becomes positive in the 2nd week, but **Blood culture** is the gold standard in the 1st week (Mnemonic: **BASU** – Blood (1st wk), Agglutination/Widal (2nd wk), Stool (3rd wk), Urine (4th wk)). * **Drug of Choice:** Ceftriaxone (for empirical/multidrug-resistant cases); Azithromycin is also commonly used.
Question 389: Anti-LKM antibody is seen in which condition?
- A. Hepatitis A
- B. Hepatitis C
- C. Hepatitis D
- D. Autoimmune hepatitis type II (Correct Answer)
Explanation: **Explanation:** **Autoimmune Hepatitis (AIH)** is a chronic inflammatory liver disease characterized by the presence of specific autoantibodies [1]. It is classified into two main types based on the serological profile: * **Type I AIH:** The most common form, characterized by **Anti-Nuclear Antibody (ANA)** and/or **Anti-Smooth Muscle Antibody (ASMA)**. * **Type II AIH:** Typically affects children and adolescents. It is characterized by the presence of **Anti-Liver Kidney Microsomal type 1 (Anti-LKM1) antibodies**. The target antigen for Anti-LKM1 is the enzyme **Cytochrome P450 2D6 (CYP2D6)**. **Analysis of Incorrect Options:** * **Hepatitis A:** This is an acute viral infection diagnosed by IgM anti-HAV. It does not involve autoantibodies. * **Hepatitis C:** While chronic HCV can sometimes trigger the production of low-titer Anti-LKM1 antibodies (molecular mimicry), the primary diagnostic markers are Anti-HCV and HCV-RNA. Anti-LKM1 is the *hallmark* diagnostic feature for AIH Type II, not Hepatitis C. * **Hepatitis D:** This is a co-infection or superinfection with Hepatitis B. Diagnosis relies on HDV-Ag or HDV-RNA. **High-Yield Clinical Pearls for NEET-PG:** * **AIH Type I:** Associated with HLA-DR3 or DR4 [1]. * **AIH Type II:** More common in females; often presents with more severe progression to cirrhosis compared to Type I. * **Anti-LKM2:** Associated with drug-induced hepatitis (e.g., Ticrynafen). * **Anti-LKM3:** Associated with Hepatitis D (Delta) infection. * **Treatment:** The mainstay of treatment for AIH is corticosteroids (Prednisolone) and Azathioprine [1].
Question 390: Which of the following statements are true regarding non-alcoholic fatty liver disease?
- A. It is seen in diabetic patients.
- B. Clofibrate is used in its treatment.
- C. It is the commonest cause of cryptogenic cirrhosis.
- D. It is associated with transaminitis. (Correct Answer)
Explanation: **Explanation:** **Non-alcoholic Fatty Liver Disease (NAFLD)**, recently renamed **MASLD** (Metabolic Dysfunction-Associated Steatotic Liver Disease), is the most common cause of chronic liver disease worldwide [1]. **Why Option D is Correct:** NAFLD is frequently associated with **transaminitis** (elevation of ALT and AST). Typically, ALT levels are higher than AST levels (ALT > AST), which helps distinguish it from alcoholic liver disease, where the ratio is usually reversed (AST:ALT > 2:1) [1]. However, it is important to note that many patients with NAFLD may have normal enzyme levels despite significant histological damage [2]. Fatty liver disease is a recognized cause of minor transaminase elevation, typically below 100 U/L [2]. **Analysis of Incorrect Options:** * **Option A:** While NAFLD is strongly associated with Type 2 Diabetes Mellitus and metabolic syndrome [1], the statement "It is seen in diabetic patients" is technically incomplete or non-exclusive. However, in the context of multiple-choice questions where one must choose the *most* definitive pathological feature, transaminitis is a hallmark clinical presentation. (Note: Some examiners consider A true, but D is the more specific clinical finding for diagnosis). * **Option B:** **Clofibrate** is not used in the treatment of NAFLD. Management focuses on weight loss, exercise, and controlling comorbidities (pioglitazone or Vitamin E may be used in specific cases). * **Option C:** NAFLD is indeed a leading cause of **cryptogenic cirrhosis** [1], but the statement is phrased as a definitive absolute. While it accounts for a majority of cases, the most direct clinical association tested in exams is the biochemical profile (transaminitis). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Liver Biopsy (shows macrovesicular steatosis) [1]. * **First-line Investigation:** Ultrasonography (shows "bright liver"). * **Key Association:** Insulin resistance is the primary pathogenetic mechanism [2]. Progression is often driven by oxidative stress, lipotoxicity, and cytokine release [3]. * **NAFLD Fibrosis Score:** Used to non-invasively assess the risk of advanced fibrosis.
Practice by Chapter
Esophageal Disorders
Practice Questions
Peptic Ulcer Disease
Practice Questions
Inflammatory Bowel Disease
Practice Questions
Irritable Bowel Syndrome
Practice Questions
Malabsorption Syndromes
Practice Questions
Pancreatitis (Acute and Chronic)
Practice Questions
Gastrointestinal Bleeding
Practice Questions
Liver Diseases and Cirrhosis
Practice Questions
Viral Hepatitis
Practice Questions
Biliary Tract Disorders
Practice Questions
Gastrointestinal Motility Disorders
Practice Questions
Gastrointestinal Malignancies
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