Upper Gastro-intestinal Disease Flashcards
Describe the layers of the the wall of the upper GI tract that is normal
What is the Z line in the normal oesophagus?
The Z line is the name for the squamo-columnar junction where squamous epithelium becomes columnar epithelium
Describe the different areas of the normal stomach
Describe the picture of normal stomach lining in the body part of the stomach
Describe the lining of the antral area of a normal stomach
- What does this image show?
- Normal duodenum
- Glandular epithelium with goblet cells - intestinal type epithelium
- Villous architecture
- villous:crypt ration of >2:1
Describe reflux oesophagitis/GORD
- What is it?
- Complications
- Gastrointestinal reflux disease is when there is reflux of acidic gastric contents and is the most commonest cause of oesophagitis
- Can cause ulceration of the oesophagus:
- necrotic slough
- inflammatory exudate
- granulation tissue
Other complications:
- Haemorrhage
- Perforation
- Stricture
- Barrett’s oesophagus
Describe Barrett’s oesophagus
- Re-epithelisation by metastatic columnar epithelium usually with goblet cells and becomes intestinal type epithelium. Squamous cells metaplasia to columnar epithelium
- Causing columnar lined oesophagus
Define the following:
- Metaplasia
- Dysplasia
- Adenocarcinoma
- Metaplasia is where one cell type changes into another e.g. squamous –> columnar
- Dysplasia changed showing some of the cytological and histological features of malignancy but no invasion through the basement membrane
- Adenocarcinoma - there is then invasion through the basement membrane
Which is the most common type of oesohpahgeal cancer?
Adenocarcinoma of the oesophagus
Describe squamous cell carcinoma of the oesophagus
- Associated with alcohol consumption and smoking
- Affects the mid/lower oesophagus
- Invasion into the submucosa
- Prognosis is poor
Describe oesophageal varices
Oesophageal varices are extremely dilated sub-mucosal veins in the lower third of the oesophagus. Most commonly due to portal hypertension as a result of liver cirrhosis
Varices can burst and cause severe haemorrhage
Describe gastritis
- Inflammation of the gastric mucosa
- Acute gastritis - acute insult
- Chronic gastritis - chronic/peristent insult
What can cause acute gastritis?
- Chemical
- aspirin/NSAIDs
- alcohol
- Corrosives
- Infection
- e.g. H.pylori
- Describe chronic gastritis and what can cause it
- Cells involved
- Chronic gastritis is caused by a constant insult that occurs within the stomach
- H.pylori commonly associated
other causes:
- Chemical - NSAIDs, bile reflux
- Autoimmune (body, auto-antibodies e.g. anti-parietal)
- Lymphocytes +/- neutrophils
MALT induction
Describe helicobacter associated gastritis
- Cause
- Pattern
- Outcome
- Cause = H.Pylori
- Pattern = chronic gastritis +/- activity
- Outcome = CLO-IM-dysplasia, adenocarcinoma, lymphoma (MALToma)
Describe the helicobacter organism as a carcinogen
- Helicobacter infection is associated with an 8x increased risk of gastric cancer
- Cag-A-positive H.pylori have a needle like appendage that injects toxin into intracellular junctions allowing the bacteria to attach more easily
- The strain is associated with more chronic inflammation
- Treatment of the infection with antibiotics drastically reduces the risk of cancer
Besides H.pylori infections, what other infections/conditions cause gastritis?
- Infection
- CMV
- Strongyloides (immunosuppression)
- Inflammatory bowel disease
- Crohn’s disease
Why do we worry about gastritis and cancer?
Chronic gastritis can lead to intestinal metaplasia and ulceration. metaplastic cell change can lead to dysplasia, which is a pre-cancerous change and lead to cancer/increase the risk of cancer
What should happen to all gastric ulcers?
All gastric ulcers should be biopsied to exclude malignancy
What are the complications of ulcers?
- Bleeding
- Anaemia
- Shock (consequence of a massive haemorrhage)
- Perforation
- Peritonitis
Describe intestinal metaplasia
Like in the oesophagus, intestinal metaplasia occurs when intestinal epithelium changes into gastric mucosa in response to long term damage/chronic insult
Causes and increased risk of cancer
Describe gastric epithelial dysplasia
- Abnormal epithelial pattern of growth
- Some of the cytological and histological features of malignancy are present, but no invasion through the basement membrane
Describe the risk factors for gastric cancers for the following:
- Host genetic factors
- Bacterial virulence factors
- Environmental factors
- Different gastric cancer phenotypes
- Host genetic factors:
- IL-1B-511*T
- IL-1-RN*2*2
- Bacterial virulence factors
- cagA PAI
- vac A s1/m1
- Environmental factors
- Smoking
- Poor diet
- Gastric cancer phenotype
- Corpus-predominant gastritis
- Multi-focal atrophic gastritis
- High gastrin + hypchlorhydria
- Low pepsinogen I and pepsinogen I/II ratio
- Bacterial overgrowth causing inflammation
- Increased risk of gastric cancer
