diseases of stomach aim: to understand the pathogenesis of gastritis, peptic ulcer disease and...
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Diseases of Stomach
Aim: to understand the pathogenesis of gastritis, peptic ulcer disease and cancer of stomach.
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Stomach
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Stomach
Histology Cell types – mucous cells
parietal cells chief cells endocrine cells.
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Gastric mucosal protection:
Intraluminal concentration of H+ is 3 million times greater than blood and tissue.
“Mucosal barrier”1] Mucous secretion.2] Bicarbonate secretion.3] Epithelial barrier (rapid regeneration).4] Mucosal blood flow (to sweep away hydrogen ions).5] Prostaglandin protection (help maintain blood flow).
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Diseases of Stomach
Clinical manifestation of gastric disease:- pain and dysphagia- loss of appetite- bleeding (hematemesis or melena )- gastric mass- gastric outlet obstruction
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Diseases of Stomach
Gastritis ACUTE CHRONIC
Gastric ulcer ACUTE CHRONIC
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Diseases of Stomach
Gastritis- Inflammation of gastric mucosa.- Could be acute or chronic.
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Chronic (non-erosive) gastritis
Chronic gastritis is defined as the presence of chronic inflammatory changes in the mucosa leading eventually to mucosal atrophy and epithelial metaplasia.
It is notable for distinct causal subgroups and for patterns of histologic alterations that vary in different parts of the world.
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Chronic (non-erosive) gastritis
Types: Type A: chronic atrophic gastritis
(Autoimmune gastritis)
Type B: Helicobacter pylori associated gastritis
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Account for less than 10% of chronic gastritis. Autoantibodies to gastric glands parietal cells and
intrinsic factor Lead to gland destruction with atrophy, loss of acid
production ( achlorhydria) and inflammation. Hypergastrinemia occurs secondary to hyperplasia of the
G (gastrin) producing cells in the antrum. Patient develops pernicious anaemia. Associated with other autoimmune disease (e.g.,
Hashimoto thyroiditis, Addison disease) There is increased incidence of adenocarcinoma (10%)
and cacinoid tumor
Type A chronic atrophic gastritis (Autoimmune gastritis)
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Most important etiologic factor found in 90% of patient with chronic gastritis.
Infected persons: increased risk for peptic ulcer and gastric carcinoma and lymphoma.
Helicobacter pylori, nonsporing, curvilinear gram negative rod, motile organisms. It elaborate urease and attach itself to gastric epithelial cells.
Preduce cytotoxin and endotoxin. Symptoms improved after antimicrobial
agents.
Helicobacter pylori associated gastritis
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- H. pylori produce urease and toxins, including lipopolysaccharide, cagA, and vacA. -These, in concert with host-derived gastric acidity and peptic enzymes, produce a chronic state of gastric mucosal injury leading to chronic gastritis.
- Note that H.pylori do not colonize regions of intestinal metaplasia.
Schematic presentation of the presumed action ofHelicobacter pylori in the development of chronic gastritis.
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After initial exposure to H. pylori, gastritis may develop in two patterns: (1) an antral-type with high acid production
and higher risk for the development of duodenal ulcer
(2) a pangastritis with multifocal mucosal atrophy, with low acid secretion and increased risk for adenocarcinoma
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Chronic (non-erosive) gastritis
Histologic features Both types (A & B) - chronic inflammation in
lamina propria with varying degrees of atrophy; metaplasia and dysplasia may occur; mostly in type A associated with pernicious anemia
Type A - loss of parietal cells Increased risk of gastric carcinoma (Types A
& B), especially when associated with pernicious anemia
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Chronic gastritis showing partial replacement of the gastric mucosal epithelium by intestinal metaplasia (upper left) and with inflammation of the lamina propria involving (right) lymphocytes and plasma cells.
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In helicobacter pylori, inflammation affect antral mucosa mainly, while autoimmune gastritis, there is diffuse mucosal damage mainly of body-fundic mucosa.
Active inflammation-neutrophil within glands. Regeneration changes. Intestinal metaplasia. Atrophy Hyperplasia of gastrin-preducing cells. Dysplasia.
Morphology of Chronic Gastritis
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Chronic gastritis
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Helicobacter pylori
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Helicobacter pylori
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Chronic GastritisClinical features:
Usually few symptoms of upper abdominal discomfort and vomiting.
Achlorhydria, hypergastrinaemia and anemia in autoimmune gastritis.
The relationship of chronic gastritis with the development of peptic ulcer, gastric carcinoma and lymphoma is present.
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Persons with chronic gastritis and H. pylori usually improve symptomatically when treated with antibiotics and proton pump inhibitors.
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Acute gastritis Usually of a transient nature. May be accompanied by hemorrhage or sloughing
of the superficial mucosa. Frequently associated with heavy use of:
aspirin and NSAID alcohol, smoking Chemotherapy Uremia systemic infection severe stress (trauma, burns) ischemia suicidal attempts gastric irradation.
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Mild: edema and vascular coungestion, scattered neutrophil in mucosa.
Severe: erosion of mucosa, hemorrhage, acute inflammatory infiltrate (acute erosive gastritis).
May be asymptomatic or present with gastric pain,vomiting, hematemesis, melena (may lead to fatal blood loss).
Acute gastritis
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Diseases of Stomach
Gastritis ACUTE CHRONIC
Gastric ulcer ACUTE CHRONIC
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Peptic Ulcer Disease
Ulcer: a breach in the mucosa of the alimentary tract extending through muscularis mucosa into submucosa or deeper.
Peptic ulcers are chronic, most often solitary occuring in any part of GIT exposed to the action of acid gastric juice.
Sites: Duodenum (first part), lower esophagus, stomach ulcer, Meckel’s diverticulum, jejunum, ileum and colon (Zollinger-Ellison syndrome)
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Peptic Ulcer Disease
In USA, 350,000 new cases – 3,000 die yearly as result of peptic ulcer.- Peptic ulcer are remitting, relapsing lesion.- Diagnoses in middle-aged to older adults.- M:F = 3:1.- Decrease in prevalence of duodenal ulcers.- Genetic influences –little or no role.- Duodenal ulcer – more in alcoholic cirrhosis, COPD,
chronic renal failure and hyperparathyroidism (hypercalcaemia increase gastrin production).
Epidemiology:
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Peptic Ulcer Disease Pathogenesis:
Two conditions are key for the development of peptic ulcers: (1) H. pylori infection, which has a
strong causal relationship with peptic ulcer development
(2) mucosal exposure to gastric acid and pepsin.
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Peptic Ulcer Disease Pathogenesis: Other causes:
Abnormal gastric mobility. Others:
NSAID Corticosteroid Aspirin Stress Cigarette smoking Zollinger Ellison syndrome Alcoholic cirrhosis
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Peptic Ulcer Disease Helicobacter pylori is present in 70% to 90% in pt. with
duodenal ulcers and 70% of gastric ulcer Only 10% to 20% of infected people develop peptic
ulcer Mechanisms include
H. pylori induces an intense inflammatory reaction (IL-1, IL-6, TNF and IL-8)
Several bacterial products (urease, phospholipase, VacA and CagA)
Enhance gastric acid secretion and impair bicarbonate production
H. pylori is immunogenic
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Pathogenesis of Ulcers
Aggressive FactorsAcid, pepsinBile saltsDrugs (NSAIDs)H. pylori
Defensive FactorsMucus, bicarbonate layerBlood flow, cell renewalProstaglandinsPhospholipidFree radical scavengers
Therapy is directed at enhancing host defense or eliminating aggressive factors; i.e., H. pylori.
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Peptic Ulcer Diseasepathology
98% located in first portion of duodenum or stomach, ratio = 4:1
Solitary – 1 to 5 cm. Margin – flush, edematous. Floor –smooth. Base – thick and firm (fibrosis). Surrounding mucosa – normal to chronic gastritis. Deep ulceration, perforation.
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Peptic Ulcer
Radiating mucosal folds
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Peptic Ulcer Disease
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Clincal features
Epigastric pain, worse at night, relieved by food and anti-acid
Nausea, vomiting, belching and weight loss
First presentation with complications Chronic recurrent
Peptic Ulcer Disease
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Complications
Bleeding Perforation Pyloric obstruction Malignant transformation, v. rare in
gastric peptic ulcer
Peptic Ulcer Disease
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Acute Gastric Ulceration May appear after stress (Stress Ulcer) Multiple lesions in stomach and duodenum Most commonly encountered in:
- sever trauma - extensive burns ( Curling Ulcer)-Trauma or surgical injury to CNS (Cushing Ulcer)
- Chronic exposure to gastric irritant.
The outcome depends on the ability to control underlying conditions.
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Stress Ulcers
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SUMMARYInflammatory Diseases of the
Stomach
Chronic gastritis: major cause is infection by Helicobacter pylori, less
commonly autoimmune in origin characterized by mononuclear cell infiltration in the
lamina propria with intestinal metaplasia and frequently, proliferation of lymphoid tissue
may be the precursor of peptic ulcer and carcinoma. Acute gastritis: acute mucosal inflammation,
usually transient, associated with use of NSAIDs, alcohol, heavy smoking, and various systemic abnormalties
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Peptic ulcer: breach in the epithelium caused most commonly by H. pylori infection and
mucosal exposure to gastric acid and enzymes (pepsin), or less frequently by use of NSAIDs
sharply demarcated mucosal defects with underlying necrosis, acute inflammation, granulation tissue, and scarring
manifested by bleeding and, less commonly, rupture. Stress ulcers (acute gastric ulcers):
associated with severe trauma, burns, CNS trauma or hemorrhage; usually small, multiple, hemorrhagic ulcers that are often shallow
SUMMARYInflammatory Diseases of the
Stomach