GI Flashcards
What causes acute pancreatitis?
Alcohol or gallstones.
Steroid can also cause acute pancreatitis
What is gastro-oesophageal reflux disease (GORD)?
Where acid from the stomach refluxes through lower oesophageal sphincter and irritates the lining of the oesophagus.
What are the symptoms of GORD?
Heartburn
Acid regurg
Retrosternal or epigastric pain
Bloating
nocturnal cough
Hoarse voice
What are the red flags of GORD that indicate referral for endoscopy?
- Dysphagia (difficulty swallowing) at any age gets a two week wait referral
- Aged over 55 (this is generally the cut off for urgent versus routine referrals)
- Weight loss
- Upper abdominal pain / reflux
- Treatment resistant dyspepsia
- Nausea and vomiting
- Low haemoglobin
- Raised platelet count
Management of GORD: Acid neutralising medication
Gaviscon and Rennie
Management of GORD: proton pump inhibitor (reduce acid secretion on the stomach)
Omeprazole
Lansoprazole
Management of GORD: Ranitidine - what is this?
What is the surgical option for GORD?
This is an alternative to PPIs
H2 receptor antagonist (antihistamines)
Reduces stomach acid
Surgical option is laparoscopic fundoplication
What sort of bacteria is H. pylori? and what does it do in the stomach?
It is a gram negative aerobic bacteria that can cause damage to the epithelial lining of the stomach resulting in gastritis, ulcers, and increase the risk of stomach cancer.
What chemical is produces by H. pylori, which will then damage the epithelial cells?
Ammonia
What tests are used to detect H. pylori?
1) Urea breath test (using radiolabelled carbon 13(
2) Stool antigen test
3) Rapid urease test (can be performed during endoscopy)
What does a rapid urease test (also known as CLO test (campylobacter-like organism test) entail?
it is performed during endoscopy and involves taking biopsy of stomach mucosa.
Urea added to the sample: if H.pylori present, they produce urease enzyme that converts urea to ammonia. - Ammonia makes solution alkali giving positive result when PH tested.
How can you eradicate H. pylori?
It is a regime involving triple therapy with PPI plus 2 antibiotics (e,g, amoxicillin and clarithromycine) for 7 days.
How does Barretts Oesophagus manifest? and what is it?
Constant acid reflux results in lower oesophageal epithelium changes by a process called metaplasia from squamous to a columnar epithelium.
Barretts oesophagus is a premalignant condition and is a risk factor for the development of adenocarcinoma - so patient are regularly monitored by endoscopy.
What is the progression stages of barretts oesophagus to adenocarcinoma?
Barretts oesophagus with no dysplasia to low grade dysplasia to high grade dysplasia to adenocarcinoma.
What is the treatment of barretts oesophagus
Proton pump inhibitors e.g. Omeprazole..
With people that has low or high grade dysplasia, they are given ablation therapy during endoscopy using photodynamic therapy, laser therapy or cyrotherapy
What is peptic ulcer? which one is more common? What is the pathophysiology? What can cause the breakdown of the protective layer in the stomach?
ulceration of the mucosa of the stomach (gastric ulcer) or the duodenum (duodenal ulcer). Duodenal ones are more common.
stomach mucosa prone to ulceration from breakdown of protective layer ( comprised of mucus and bicarbonate secreted by the stomach mucosa) or by increase in stomach acid.
Protective layer breakdown due to medication (e.g. steroids or NSAIDs) and H. pylori.
What factors increase stomach acids?
- Stress
- alcohol
- caffeine
- smoking
- spicy food
What are the symptoms of peptic ulcers?
- epigastric discomfort or pain
- Nausea and vomiting
- Dyspepsia
- Bleeding causes haematemesis, “coffee ground” vomiting and melaena.
- Iron deficiency anaemia (due to constant bleed)
How to distinguish gastric ulcers and duodenal ulcers from symptoms?
Eating worsens the pain in gastric ulcers and improves the pain in duodenal ulcers.
How to make diagnosis for peptic ulcer? Medication for peptic ulcers?
Endoscopy - rapid urease testing (CLO test), also biopsy is used to exclude malignancy.
Medication: Same as GORD but usually with high dose proton pump inhibitors (PPI)
What are the 3 complications that can arise from peptic ulcers?
1) Bleeding
2) Perforation resulting in acute abdomen and peritonitis
3) Scarring and strictures of muscle and mucosa - lead to pyloric stenosis
What are the features of acute pancreatitis?
- severe epigastric pain that may radiate through the back
- vomiting
- epigastric tenderness, ileus and low grade fever
- periumbilical discolouration (Cullen’s sign) and flank discolouration (Grey-Turner’s sign)
What is the triad used to diagnose ascending cholangitis?
Charcots triad - right upper quadrant pain, fever and jaundice
What specific investigation can be conducted to diagnose acute pancreatitis?
- Serum amylase: raised (also raised in pancreatic pseudocyst, mesenteric infarct, perforated viscus, acute cholecystitis, diabetic ketoacidosis)
- serum lipase
- Imaging: ultrasound (however, diagnosis can be made without imagining), can also do contrast-enhance CT.
What scoring system is used to identify cases of severe pancreatitis?
What are some of the common factors that indicate severe pancreatitis?
- Ranson Score
- Glasgow-imrie score
- APACHE 2
Factors include:
- age above 55
- hypocalcaemia
- hyperglycaemia
- hypoxia
- neutrophila
- elevated LDH and AST.
What commonly causes acute upper GI bleed?
Oesophageal varices or peptic ulcers.
What scoring tool is used for acute upper GI bleed? When do you do tehse?
- Glasgow-Blatchford score at first assessment (helps to know if patients can be managed outpatient or not).
- Rockall score after endoscopy
what is the resus for acute upper GI bleed?
When should endoscopy be offered?
- ABC, wide-bore intravenous access * 2
- platelet transfusion if actively bleeding platelet count of less than 50 x 10*9/litre
- fresh frozen plasma to patients who have either a fibrinogen level of less than 1 g/litre, or a prothrombin time (international normalised ratio) or activated partial thromboplastin time greater than 1.5 times normal
- prothrombin complex concentrate to patients who are taking warfarin and actively bleeding
Endoscopy offered immediately after resus
What is management of non-variceal bleeding?
proton pump inhibitors (PPIs) - HOWEVER, NICE recommends to NOT use PPI before endoscopy.
What is the management of variceal bleed?
- terlipressin and prophylactic antibiotics should be given to patients at presentation (i.e. before endoscopy)
- band ligation should be used for oesophageal varices and injections of N-butyl-2-cyanoacrylate for patients with gastric varices
transjugular intrahepatic - portosystemic shunts (TIPS) should be offered if bleeding from varices is not controlled with the above measures
What does diverticular disease consists of?
herniation of colonic mucosa through muscular wall of the colon - usual site is between taenia coli.
What are the symptoms of diverticular disease?
- Altered bowel
- rectal bleeding
- abdominal pain
What are the treatment for diverticular disease?
- increase fibre intake
- mild attacks of diverticulitis managed with antibiotics
- peri-colonic absesses drained surgically or radiologically.
- recurrent episodes of acute diverticulitis will need segment resection.
- Hinchey IV perforations (generalised faecal peritonitis) will require a resection and usually a stoma.
What are the 3 types of colon cancer?
- Sporadic (95%)
- hereditary non-polyposis colorectal carcinoma (HNPCC, 5%).
- Familial adenomatous polyposis (FAP, less than 1%)
What mutation cause familial adenomatous polyposis (FAP)?
tumour suppressor gene called adenomatous polyposis coli (APC) gene.
The mutation of what gene cause hereditary non-polyposis colorectal cancer (HNPCC)?
- MSH2 (60% of cases)
- MLH1 (30%)
What gene mutation cause Gilbert’s syndrome?
UGT1A1
What is gilbert’s syndrome?
it is a hereditary condition that affects the liver’s ability to conjugate bilirubin and that can lead to raised serum levels of unconjugated bilirubin.
What criteria is used to diagnose colorectal cancer?
The Amsterdam criteria
sometimes used to aid diagnosis:
- at least 3 family members with colon cancer
- the cases span at least 2 generations
- at least one case diagnosed before the age of 50 years
What does crohn’s disease cause in young patients?
Fistula
Crohn’s disease cause inflammation throughout the GI tract, accounting oral ulcers and inflammation of the ileum.
What are the features of Crohn’s disease?
Crohn's (Crows NESTS) N- No blood or mucus E- Entire GI tract S - 'Skip lesion' on endoscopy T- Terminal ileum most affected and Transmural (full thickness) inflammation. S - Smoking is a risk factor
Crohn’s is also associated with weight loss, strictures and fistulas
What are the features of ulcerative colitis?
Ulcerative colitis (U-C-CLOSEUP)
C- Continuous inflammation L- Limited to colon and rectum O- Only superficial mucosa affected S - Smoking is protective E - Excrete blood and mucus U - Use aminosalicylates P - Primary Sclerosing Cholangitis
What testing is used for inflammatory bowel disease? (Crohn’s and diverticulitis)
- Routine blood
- CRP
- Faecal calprotectin (released by intestines when inflamed)
- Endoscopy with biopsy
- Imaging with ultrasound, CT and MRI can be used to look for complications such as fistulas, abscesses and strictures.
What is the first time treatment for Crohn’s to induce remission? What would you give this alone doesn’t work?
Steroids e.g prednisolone or IV hydrocortisone
Steroid doesn’t work, add immunosuppressant medication under specialist guidance:
- Azathioprine
- Mercaptopurine
- Methotrexate
- Infliximab
- Adalimumab