Gastroenterology Flashcards
What are the symptoms and signs suggestive of GI perforation?
Acute Abdomen pain worse on coughing/moving
Hx of alcohol/NSAIDs/ulcer/cancer/IBD
Tachcycardia +/- hypotension
Increased RR
Peritonism (abdo tender, guarding, rebound, rigidity)
Reduced/absent bowel sounds
What would your initial investigations be for someone presenting with peritonism?
Bedside- basic obs, ECG, urine dip + BhCG if female
Bloods- FBC, CRP, lactate, amylase, ABG (acidosis)
Imaging- Erect CXR (air under diaphragm), Abdomen XR if ? obstruction
What is the initial management of perforation?
Resuscitate with IV fluids
O2
IV access
Analgesia (IV morphine 5-10mg IV with cyclizine 50mg/8hr)
Cross match blood
IV abx
What are the causes of perforation?
Ulcer, appendicitis, IBD, diverticulitis, obstruction, GI cancer, gallbladder perforation
What are the main causes of bowel obstruction?
Small bowel- adhesions, hernia, IBD
Large bowel- malignancy, diverticulitis, volvulus, faeces
What are the symptoms and signs of bowel obstruction?
Vomiting, constipation (if no flatus = complete), colicky abdominal pain, bloating, anorexia
Small bowel= early vomiting, late constipation
Large bowel= early absolute constipation, late vomiting Tachycardia +/- hypotension
- Increased RR
- Abdo distension
- Absent/tinkling bowel sounds
- Peritonitis
- Surgical scars/hernia
How would a strangulated bowel present?
Constant severe pain
Ill patient
Peritonitis
What is the management of strangulated bowel?
Urgent surgery
What is the management of a small bowel obstruction?
Drip and suck- IV fluids, NG tube, NBM
Surgery if deteriorate
K often lost and needs replacing
What is the management of a large bowel obstruction?
IV fluids, NBM, surgical r/v If caecum >10cm on AXR need urgent surgery
Otherwise investigate cause with CT/colonoscopy Then surgery
What is paralytic ileus? What are the investigations and management?
Loss of bowel motility as a response to inflammation e.g. surgery, pancreatitis
Can mimic intestinal obstruction
Usually less abdo pain
Imaging to exclude obstruction
Management: conservative with IVT, NBM, NG tube until resolves. May need electrolyte replacement e.g. Mg and K.
What are the possible complications of bowel obstruction?
Perforation, bowel infarction, strangulation, hypokalaemia, hypovolaemia
What are the causes of acute pancreatitis?
- Gallstones
- Ethanol
- Trauma
- Steroids
- Mumps
- Autoimmune
- Scorpion venom
- Hypercalcaemia, hypertriglyceridaemia, hypothermia
- ERCP
- Drugs (azathioprine, bendroflumethiazide, furosemide, steroids, sodium valproate etc)
What are the risk factors for Barrett’s oesophagus?
GORD
Male
Smoking
Central obesity
Histology of Barrett’s oesophagus
lower oesophageal mucosa squamous epithelium replaced by columnar epithelium
Goblet cells
Brush border
What is the increased risk of oesophageal adenocarcinoma associated with Barrett’s?
50-100 fold
What is the management of Barrett’s oesophagus?
Endoscopic survelliance + biopsies
High dose PPI
Which biliary disease is associated with UC?
Primary sclerosing cholangitis
Features of PSC
Cholestasis- jaundice and pruritis
RUQ pain
Fatigue
Investigation to diagnose PSC
ERCP/MRCP
PSC is associated with an increased risk of…
Cholangiocarcinoma
Main autoAbs in PSC
ANCA
ANA
Beaded appearance of bile ducts suggests…
PSC
Features of Wilsons disease
Hepatitis
Cirrhosis
Speech, behavioural, psychiatric problems
Asterix, chorea, dementia
Kayser-Fleischer rings
Renal tubular acidosis
Haemolysis
Blue nails
Dx of Wilsons
Reduced serum caeruloplasmin
Reduced serum copper (counter-intuitive, but 95% of plasma copper is carried by ceruloplasmin)
Increased 24hr urinary copper excretion
1st line treatment for Wilson s
Penicillamine
Inhertiuance of Wilsons disease
Autosomal recessive
Disease characterised by excess copper deposition
Wilson’s
H pylori is most associated with
Peptic ulcer disease
H pylori eradication
7 days of: PPI + amox + clarithromycin
or
PPI + metronidazole + clarithromycin
Definition of constipation
Infrequent stools
Difficulty passing stools
Sensation of incomplete emptying
Chronic constipation
Sx for at least 12 weeks in last 6 months
Functional constipation
Unknown cause
Secondary constipation
Due to drug/medical condition
Management of constipation (adults)
Manage underlying causes/drugs
Lifestyle- increase fibre, fluid intake, activity levels
If faecal loading/impaction manage this 1st
Laxatives (titrate to produce soft formed stool w/out straining at least 3x per week):
1) Bulk forming e.g. ispaghula
2) Osmotic e.g. macrogol (1st line)/lactulose/phosphate enema
3) Stimulant e.g. Senna, docusate, bisacodyl, sodium picosulfate
Management of opioid induced constipation
osmotic laxative + stimulant laxative
Features indicating constipation in children
Stool patterns:
- Fewer than three complete stools per week (unless exclusively breastfed, when stools may be infrequent).
- Hard, large stool.
- ‘Rabbit droppings’ stool.
- Overflow soiling in children older than 1 year of age (commonly very loose, smelly stools, which are passed without sensation or awareness)
Symptoms associated with defecation in a child at any age:
- Distress or pain on passing stool.
- Bleeding associated with hard stool.
- Straining.
Symptoms associated with defecation in a child older than 1 year of age:
- Poor appetite that improves with passage of large stool.
- Waxing and waning of abdominal pain with passage of stool.
- Evidence of ‘retentive posturing’ — typical posture is straight-legged, on tiptoes with an arched back.
- Anal pain.
Past history of constipation.
Previous or current anal fissure.
Management of constipation in children
- Offering reassurance that underlying causes of constipation have been excluded.
- Advising that idiopathic constipation is treatable with laxatives, although they may need to be taken for several months.
- Offering sources of information and support.
- Treating faecal impaction with a recommended disimpaction regimen.
- Starting maintenance laxative drug treatment if impaction is not present or has been successfully treated.
- Advising on behavioural interventions such as scheduled toileting, use of a bowel habit diary, and reward systems.
- Arranging regular follow-up to assess adherence and response to treatment.
- Considering the need for specialist referral if symptoms do not respond to optimal treatment in primary care, or if there is faecal impaction and the child is very distressed.
1st line treatment for feacal impaction in children
Movicol 1st line
If not working after 2 weeks add stimulant laxative e.g. Senna
Once disimpacted start maintenance laxatives
Choice of laxatives in children
Osmotic laxatives - increase fluid in large bowel, softening stool and stimulating peristalsis
e.g. Movicol, lactulose
Stimulant laxatives - cause peristalsis by stimulating colonic and rectal nerves
e.g. Senna, Docusate, Bisacodyl, Sodium picosulfate
Most common risk factors for peptic ulcer disease
H.pylori infection
NSAIDs
Complications of peptic ulcer disease
Haemorrhage
Perforation
Gastric outlet obstruction
Gastric malignancy (increased risk in H.pylori positive gastric ulcer disease)
Management of peptic ulcer disease
Lifestyle measures:
- Weight loss
- Avoid triggers e.g. coffee, chocolate, tomatoes, fatty, spicy foods
- Smaller meals
- Eat meals 3-4 hours before bed
- Stop smoking
- Reduce alcohol
Manage stress/anxiety/depression
Medication review:
- Stop NSAIDs
- Consider reducing or stopping (if possible and appropriate) any other potential ulcer-inducing drugs, such as:
Aspirin, bisphosphonates, corticosteroids, potassium supplements, selective serotonin reuptake inhibitors (SSRIs), or recreational drugs such as crack cocaine.
Test for H.pylori: carbon-13 urea breath test or stool antigen test (no PPI for 4 weeks, no abx for 2 weeks):
- If positive and not associated with NSAIDs, prescribe eradication therapy
- If positive and associated with NSAIDs, give full dose PPI for 2 months then eradication therapy
- If negative prescrive full dose PPI 4-8 weeks
Symptoms of infective gastroenteritis
- Rapid onset
- Recent vomiting/diarrhoea
- Feels unwell
- Crampy abdominal pain
- Flu-like symptoms
- Pyrexia
- Other household members/contacts affected
Causes of infectious diarrhoea
- Viral infection- norovirus, sapovirus, rotavirus
- Bacterial causes- Salmonella, Camylobacter, E.coli, Shigella, C.difficile.
- Parasitic- Cryptosporidium, Giardia, Entamoeba histolytica, and Cyclospora.
Causes of bloody diarrhoea
Bacterial: Campylobacter jejuni, Salmonella, Escherichia coli O157:H7, Vibrio parahaemolyticus, Shigella, Yersinia, Aeromonas, Clostridium difficile.
Viruses: cytomegalovirus.
Parasites: Entamoeba histolytica, schistosomiasis.