Wednesday, 7 April 2010

Chronic Gastritis

Characterised by:

  • chronic inflammation of the gastric mucosa
  • mucosal atrophy
  • epithelial metaplasia.
  • commonly without erosions

Symptoms
Episodic pain
Nausea
Vomiting

Cx
Anaemia
Peptic Ulcer Disease
Gastric Carcinoma

Aetiology
Autoimmune gastritis
Bacterial gastritis
Chemical gastritis
Misc (Crohn's, radiotherapy)


Autoimmune Gastritis

  • < 10% of chronic gastritis
  • Autoantibodies produced to gastric parietal cells (90%) and intrinsic factor (60%)
  • 10% have pernicious anaemia (where decreased intrinsic factor and decreased gastric acid production = decreased vit B12 absorption)
  • Autoimmune associations with Hashimoto's thyrioditis and Addison's disease

Pathology
Commonly occurs in the gastric body or fundus
Immune-mediated destruction of the gastric glands
Chronic inflammation
Mucosal atrophy


Bacterial Gastritis

  • Helicobacter Pylori makes up 90% of chronic antral gastritis
  • Gram-negative rod
  • No mucosal invasion
  • Instead adheres to surface epithelium & produces urease
  • Urease converts urea to ammonia, which buffers local gastric acid
  • Increases risk of PUD and gastric cancer

Aetiology
Arises from chronic gastric mucosal injury
Alcohol
Smoking
Bile reflux

Ix
Commonly found in antrum (less so in the body/fundus)
Early findings:
hyperaemic, course, boggy (similar to early malignancy)
Later findings:
mucosa flattened and thin, after long-standing atrophy
Micro
1) Inflammatory aggregates - lymphocytes and plasma cells within lamina propria
2) Intestinal metaplasia
3) Glandular atrophy
4) Neutrophils within glandular epithelium

 - H Pylori within syperficial mucosal layer
 - Not found in areas of intestinal metaplasia (Absent in BarO and duodenal/pyloric metaplasia)

Cx
Long-standing
Epithelial atypia & dysplasia (pastricularly with atrophic gastritis & pernicious anemia)
Increase risk of cancer

1 comment:

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