Clinical Biochemistry Lecture 8 - GI Disorders
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Questions and Answers

What triggers coeliac disease?

  • Sensitivity to casein
  • Sensitivity to fructose
  • Sensitivity to lactose
  • Sensitivity to gliadin (correct)
  • What is the most common enteropathy in the Western world?

  • Crohn's disease
  • Ulcerative colitis
  • Irritable bowel syndrome
  • Coeliac disease (correct)
  • Which test is considered the gold standard for diagnosing coeliac disease?

  • Total IgA level measurement
  • Serum IgA antibody test
  • Small intestinal biopsy (correct)
  • MRI of the abdomen
  • In patients with IgA deficiency, which antibody measurement is recommended?

    <p>Anti-tTG IgG (A)</p> Signup and view all the answers

    What may lead to the development of cancer if left untreated?

    <p>Coeliac disease (D)</p> Signup and view all the answers

    What is a common symptom of Peptic Ulcer Disease?

    <p>Severe pain in the mid to upper abdomen (D)</p> Signup and view all the answers

    Which bacterium is most commonly associated with causing Peptic Ulcer Disease?

    <p>Helicobacter pylori (A)</p> Signup and view all the answers

    What condition is primarily caused by chronic hypersecretion of gastric acid due to increased gastrin production?

    <p>Peptic ulceration (B)</p> Signup and view all the answers

    What factor aids Helicobacter pylori in neutralizing stomach acid?

    <p>Production of urease (A)</p> Signup and view all the answers

    Which of the following is NOT a method for diagnosing Peptic Ulcer Disease?

    <p>Liver function tests (B)</p> Signup and view all the answers

    Which of the following enzymes is responsible for fat digestion in the pancreas?

    <p>Lipase (D)</p> Signup and view all the answers

    Which substance inhibits the action of pancreatic lipase causing fat malabsorption?

    <p>High H+ concentration (D)</p> Signup and view all the answers

    What is the purpose of the urea breath test in diagnosing Helicobacter pylori infection?

    <p>To detect urease activity of H.pylori (D)</p> Signup and view all the answers

    Why are serological tests less effective in confirming the eradication of H.pylori?

    <p>Antibody titres reduce slowly after infection (D)</p> Signup and view all the answers

    What is a key laboratory test for diagnosing acute pancreatitis?

    <p>Elevated serum lipase levels (C)</p> Signup and view all the answers

    What condition is associated with a gastrinoma?

    <p>Zollinger-Ellison syndrome (B)</p> Signup and view all the answers

    What is one of the main causes of acute pancreatitis related to gallstones?

    <p>Obstruction of the major papilla (D)</p> Signup and view all the answers

    Which testing method is considered excellent for pre- and post-treatment detection of H.pylori?

    <p>Faecal antigen testing (C)</p> Signup and view all the answers

    Which factor increases oxidative stress inside the pancreas, potentially leading to acute pancreatitis?

    <p>Alcohol metabolites (D)</p> Signup and view all the answers

    In diagnosing gastrinoma, what condition should patients avoid prior to measuring plasma gastrin levels?

    <p>Proton pump inhibitors or H2 receptor blockers (B)</p> Signup and view all the answers

    Which enzyme is not secreted by the pancreas for protein digestion?

    <p>Amylase (D)</p> Signup and view all the answers

    What type of cells in the gastric glands secrete hydrochloric acid?

    <p>Parietal cells (B)</p> Signup and view all the answers

    Which is a symptom of Peptic Ulcer Disease?

    <p>Burning pain in the stomach (C)</p> Signup and view all the answers

    What is the pH range of stomach contents due to hydrochloric acid?

    <p>1.5 to 3.5 (A)</p> Signup and view all the answers

    Which hormone is primarily released by enteroendocrine G cells?

    <p>Gastrin (B)</p> Signup and view all the answers

    What is a common symptom of chronic pancreatitis?

    <p>Constant, dull, unremitting abdominal pain (B)</p> Signup and view all the answers

    What condition is characterized by a painful lesion in the stomach lining or duodenum?

    <p>Peptic Ulcer Disease (C)</p> Signup and view all the answers

    Which diagnostic test is used to assess pancreatic function?

    <p>Fecal elastase test (B)</p> Signup and view all the answers

    What is the role of intrinsic factor produced by parietal cells?

    <p>Absorption of vitamin B12 (B)</p> Signup and view all the answers

    Which cells secrete pepsinogen in the stomach?

    <p>Chief cells (C)</p> Signup and view all the answers

    What complication can arise from chronic pancreatitis?

    <p>Malabsorption with steatorrhea (C)</p> Signup and view all the answers

    What may cause dark or black stool in Peptic Ulcer Disease?

    <p>Bleeding (D)</p> Signup and view all the answers

    What does the glucose hydrogen breath test help diagnose?

    <p>Small intestinal bacterial overgrowth syndrome (SIBO) (D)</p> Signup and view all the answers

    Which of the following conditions leads to fat malabsorption due to bacterial colonization?

    <p>Small intestinal bacterial overgrowth syndrome (A)</p> Signup and view all the answers

    What effect does chronic pancreatitis typically have on blood glucose levels?

    <p>Elevated random plasma glucose (D)</p> Signup and view all the answers

    What can lead to false-positive results in fecal elastase testing?

    <p>High water content in feces (D)</p> Signup and view all the answers

    What is a potential consequence of small intestinal bacterial overgrowth (SIBO)?

    <p>Vitamin B12 deficiency (B)</p> Signup and view all the answers

    Flashcards

    Gastrin Hypersecretion

    Increased gastrin production leads to excessive stomach acid, causing problems like ulcers.

    Peptic Ulcers

    Sores in the lining of the stomach or upper small intestine, often caused by too much stomach acid.

    Pancreatic Lipase Inhibition

    High stomach acid in the intestines hinders the enzyme that breaks down fats.

    Acute Pancreatitis

    Inflammation of the pancreas, often due to gallstones or alcohol.

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    Pancreatic Lipase

    Enzyme that digests fats in the intestines.

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    ERCP

    Endoscopic procedure used to visualize and treat problems in the bile duct and pancreas.

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    Amylase and Lipase Tests

    Blood tests used to detect acute pancreatitis by measuring the levels of these pancreatic enzymes.

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    Lipase (Acute Pancreatitis)

    More reliable marker for acute pancreatitis than amylase because it stays elevated longer.

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    Gastric Mucosa

    The epithelial lining of the stomach, primarily made of mucus-producing cells.

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    Gastric Gland

    The glands in the stomach that produce gastric juice, consisting of various secretory cells.

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    Parietal Cells

    Stomach cells that produce hydrochloric acid (HCl) and intrinsic factor.

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    Chief Cells

    Stomach cells that secrete pepsinogen, the inactive form of protein-digesting enzyme pepsin.

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    Hydrochloric acid (HCl)

    A strong acid produced by parietal cells in the stomach that activates pepsin and helps in digestion.

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    Intrinsic Factor

    A glycoprotein produced by parietal cells essential for Vitamin B12 absorption in the small intestine.

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    Zollinger-Ellison syndrome

    A condition causing excessive stomach acid secretion leading to peptic ulcers.

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    Peptic Ulcer Disease (PUD) Symptoms

    Vomiting blood (coffee-ground appearance), weight loss, and severe mid-to-upper abdominal pain are signs of PUD.

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    H. pylori Infection Cause of PUD

    The most common cause of peptic ulcer disease is infection by the bacterium Helicobacter pylori.

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    Urea breath test

    A diagnostic test for active H. pylori infection, which detects urease activity.

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    Urea breath test use.

    Used to detect active H. pylori infection and evaluate treatment effectiveness.

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    Serological test

    Detects antibodies to H. pylori.Useful for identifying past infections but not for evaluating eradication.

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    Faecal antigen test

    Uses enzyme-linked immunosorbent assays to detect H. pylori in stool.

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    Zollinger-Ellison Syndrome Cause

    Caused by a gastrinoma, a tumor that creates excessive gastrin production.

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    H. pylori Virulence Factor: Urease

    H. pylori's urease enzyme breaks down urea into ammonia, neutralizing stomach acid and protecting bacteria.

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    Chronic Pancreatitis Symptoms

    Chronic, dull abdominal pain, epigastric tenderness, and weight loss are common symptoms of chronic pancreatitis.

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    Chronic Pancreatitis Complications

    Chronic pancreatitis can lead to malabsorption (steatorrhea) and eventual diabetes.

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    Fecal Elastase

    A pancreas-specific enzyme that can be measured in the stool to assess pancreatic function.

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    Low Fecal Elastase

    Indicates pancreatic insufficiency, meaning the pancreas isn't producing enough digestive enzymes.

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    Small Intestinal Bacterial Overgrowth (SIBO)

    A condition where bacteria overgrow in the small intestine.

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    Glucose Hydrogen Breath Test

    A diagnostic test for SIBO, based on bacteria fermentation of carbohydrates.

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    SIBO Cause of Fat Malabsorption

    Bacteria in the small intestine can disrupt bile acid function, leading to inadequate fat absorption.

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    SIBO Vitamin Deficiency

    Bacteria can use up vitamin B-12, causing a deficiency in the body.

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    Celiac Disease

    An autoimmune disorder triggered by gluten, causing inflammation in the small intestine, leading to malabsorption and potential cancer if left untreated.

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    Gliadin

    Alcohol-soluble fraction of gluten found in wheat, barley, and rye that triggers celiac disease.

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    Anti-tTG IgA

    Antibody used to diagnose celiac disease, indicating sensitivity to gluten.

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    Small Intestinal Biopsy

    Gold standard for confirming celiac disease diagnosis.

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    IgA Deficiency

    A condition where the body doesn't produce enough IgA, making celiac disease diagnosis difficult.

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    Study Notes

    Biochemistry Department - Clinical Biochemistry

    • Course name: Clinical Biochemistry
    • Course code: PB416/PBC416
    • Instructor: Nora Aborehab, PhD, FHEA, PGCHE
    • Associate Professor of Biochemistry & Molecular Biology
    • Head of Biochemistry Department
    • Faculty of Pharmacy, Ahram Canadian University

    Lecture 8 - Gastrointestinal Disorders

    • Topic: Gastrointestinal Disorders

    Learning Outcomes

    • Discuss causes and symptoms of peptic ulcer and Zollinger-Ellison syndrome
    • Differentiate between acute and chronic pancreatitis
    • Explain bacterial colonization of the small intestine
    • Demonstrate Coeliac disease

    References

    • Clinical chemistry: principles, techniques, and correlations by Michael L. Bishop, Edward P. Fod, Larry E. Schoeff
    • 7th ed.
    • Lecture notes: Clinical biochemistry by Simon Walker, Geoffrey Beckett, Peter Rae, Peter Ashby-9th ed

    Interactive Teaching Methods

    • E-learning (asynchronous)
    • Case-based learning

    Stomach: Peptic Ulcer Disease (PUD)

    • Definition: A painful lesion in the stomach lining (gastric ulcer) or duodenum (duodenal ulcer)
    • Symptoms: Burning pain, bloating, heartburn, nausea/vomiting, dark/black stool (due to bleeding), vomiting blood (coffee-grounds), weight loss, severe pain in the mid to upper abdomen
    • Causes: Helicobacter pylori infection, excessive use of NSAIDs, alcoholism, radiation treatment, Zollinger-Ellison syndrome

    Stomach: H. pylori

    • Virulence factors: flagella (motility), urease (breaks down urea into ammonia and carbon dioxide, neutralizing stomach acid), multiple adhesins (attachment/penetration)

    Stomach: PUD Diagnosis

    • Endoscopy-based (invasive)
    • Laboratory testing (non-invasive): urea breath test, serological tests, faecal antigen testing

    PUD: Urea Breath Test

    • Principle: Relies on urease activity of H. pylori to detect active infection
    • Procedure: Patient ingests 13C- or 14C-labeled urea. Urease hydrolyzes urea into ammonia and isotopically labeled carbon dioxide. Carbon dioxide is absorbed from the gut and subsequently expired in the breath.
    • Use: Identification of patients with active infection, effectiveness of treatment
    • Feature: Highly sensitive and specific

    PUD: Serological Test

    • Feature: Detects antibodies to H. pylori in patients who have been infected.
    • Limitation: Less helpful in confirming eradication due to slow reduction in antibody titres

    PUD: Faecal Antigen Testing

    • Method: Enzyme immunoassays detect H. pylori in stool specimens
    • Application: Pre- and post-treatment

    Stomach: Zollinger-Ellison Syndrome

    • Cause: Gastrinoma – neoplasia of gastrin-producing cells
    • Effect: Increased gastrin production leads to chronic hypersecretion of gastric acid, resulting in peptic ulceration, diarrhoea, and fat malabsorption (steatorrhoea)
    • Diagnosis: Elevated fasting plasma gastrin levels in presence of gastric acid hypersecretion
    • Important note: Patients should not be receiving proton pump inhibitors or H2 receptor blockers during measurement

    Pancreas

    • Function: Complex gland with endocrine (insulin and glucagon secretion to regulate glucose metabolism) and exocrine (pancreatic juice production) functions
    • Pancreatic juice composition: Alkaline solution containing enzymes (amylase, lipase, and colipase, trypsinogen, chymotrypsinogen) for digestion
    • Regulation of pancreatic juice secretion: Presence of acid in the duodenum causes secretin release to stimulate bicarbonate secretion; presence of fats in duodenum triggers cholecystokinin release to stimulate enzyme secretion; vagal stimulation releases pancreatic enzymes

    Pancreas: Acute Pancreatitis

    • Cause: Gallstones (obstruction of major papilla, causing bile reflux into pancreatic duct); alcoholism (metabolite increases oxidative stress); hypertriglyceridemia
    • Diagnosis: Endoscopic retrograde cholangiopancreatography (ERCP), laboratory testing (amylase, lipase)

    Pancreas: Acute Pancreatitis Diagnosis

    • Amylase: Serum amylase levels increase, peaks within 24-72 hours. Highly sensitive but not specific.
    • Lipase: Serum lipase levels increase, peaks with some delay after amylase. Highly sensitive and specific marker for acute pancreatitis.
    • Note: Transient rises may occur in various other abdominal conditions (e.g., perforated peptic ulcer, ruptured ectopic pregnancy), or after morphine or other drug injection.

    Pancreas: Chronic Pancreatitis

    • Occurrence: Commonly follows acute pancreatitis
    • Symptoms: Constant dull abdominal pain, epigastric tenderness, weight loss
    • Complications: Malabsorption (steatorrhoea), diabetes (elevated random plasma glucose)

    Pancreas: Chronic Pancreatitis Diagnosis

    • Imaging techniques (e.g., plain abdominal X-ray)
    • Laboratory testing (e.g., fecal elastase - 5-6 times higher than duodenal fluid concentrations. Low levels indicate pancreatic insufficiency)

    Small Intestine & Colon: Bacterial Colonization of the Small Intestine (SIBO)

    • Another name: Small intestinal bacterial overgrowth syndrome
    • Impaired immune mechanisms lead to anaerobic bacteria colonization.
    • Results: Fat malabsorption, due to excessive deconjugation of bile acid in the presence of bacteria and premature reabsorption of unconjugated bile acids. This leads to relative deficiency of bile salts, and decreased micelle formation. This can also lead to Vitamin B12 deficiency due to the bacteria consuming it.
    • Diagnosis: culture of small bowel aspirate, glucose hydrogen breath test (GHBT).

    Small Intestine & Colon: Glucose Hydrogen Breath Test (GHBT)

    • Principle: Based on the ability of some bacteria to ferment carbohydrates, producing hydrogen as an end-product.
    • Process: Patient ingests a glucose load; hydrogen produced in gut is absorbed and measured in exhaled breath.
    • Application: Indicator of malabsorption and proximal bacterial overgrowth.

    Small Intestine & Colon: Coeliac Disease (Celiac Sprue)

    • Definition: Chronic inflammatory autoimmune disorder triggered by sensitivity to gliadin (gluten).
    • Causes: Gluten sensitivity, malabsorption in the small intestine. If left untreated can cause cancer
    • Diagnosis: Presence of antibodies to tissue transglutaminase (anti-tTG IgA). Small intestinal biopsy remains the gold standard.
    • Risk factors: Type 1 diabetes, thyroid disease, positive family history of Celiac disease
    • IgA Deficiency: Occurs in 1 in 500 of the general population, and in approximately 2-3% of patients with celiac disease

    Case Study

    • The case study has components of knowledge, subject, research, method, criteria analysis, conclusion, and evidence.

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    Description

    This quiz covers key concepts from Lecture 8 of the Clinical Biochemistry course, focusing on gastrointestinal disorders. Students will explore topics such as peptic ulcers, pancreatitis, and Coeliac disease through interactive learning and case studies.

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