GI Medicine Flashcards
Staph. aureus: enterotoxin from food Vomiting shortly after consumption Bacillus cereus: reheated rice Vomiting later, 1-2h hx
Gastroenteritis
Salmonella, Shigella, Campylobacter Lower abdo pain + diarrhoea
Dysentry
Baby, 3-6 weeks old, projectile vomiting Palpable mass in epigastrium, succession splash
Pyloric Stenosis
Burns, haematemesis
Curling’s Ulcer
Sepsis, IC lesion, organ failure, haematemesis
Cushing’s Ulcer
Gastrin-secreting tumour
Recurrent ulceration, high serum gastrin
Zollinger Ellison
Massive haematemesis, macrocytic anaemia, Hx of alcoholism
Oesophageal Varices
Short hx of change in bowel habit Tenesmus and mucus
Rectal Carcinoma
Reduced food intake, low fibre diet, lack of exercise/mobility, elderly
Simple Constipation
Constipation due to pain
Anal Fissure
Young, constipated, distended abdomen
Agangliosis
Hx of broad-spec abx, green diarrhoea
C Diff
Visit to Eastern Europe/Russia
Pale stool, foul flatus, watery diarrhoea
Giardia
Prev hx. of chronic constipation
Overflow
Diarrhoea, recently started OCP, diet controlled
Lactose Intolerance
Bloody diarrhoea + intense abdo pain
Ischaemic Colitis
Loose stool, weight loss, hypopigmentation, onycholysis
Thyrotoxicosis
Worse epigastric pain on meals/EtOH
Chronic Pancreatitis
Rapidly progressive dysphagia, weight loss, hypoproteinaemia
Apple core lesion on barium swallow
Oesophageal Carcinoma
Progressive difficulty with speech/ swallowing
Weak facial muscles, absent jaw jerk
Bulbar Palsy
Weight loss + anorexia + iron deficiency Signet-ring cells, leather bottle stomach
Adenocarcinoma
Immunosuppression
Generalised ulceration of oesophagus
Oesophageal Candidiasis
Infiltration of atypical lymphocytes Thickened folds
MALT lymphoma
Slit-like vascular spaces Proliferating spindle cells Purple, plaque-like lesions
Kaposi’s Sarcoma
Cholestatic jaundice, ↑ALP Beading of intrahepatic ducts Associated with UC
Sclerosing Cholangitis
Ulcer on L shin IBD/Vasculitis/haem malignancy
Pyoderma Gangrenosum
Acute illness + raised bilirubin
Gilbert’s Syndrome
RNA
Jaundice, Diarrhoea + Fever
Hepatitis A
Thrombus in hepatic portal vein Secondary to thrombogenic disorders
Budd Chiari
Chronic liver disease + jaundice Antimitochondrial antibodies
Primary Biliary Cirrhosis
dsDNA
Mild fibrosis
Chronic Hep B
Haemosiderin within hepatocytes Darken skins
Raised transaminase
Genetic Haemochromatosis
Copper accumulation
Neuro (adults), liver (children)
Wilson’s disease
In acute oesophageal variceal bleeding, what is the management?
Variceal band ligation is the NICE recommended method of stopping oesophageal variceal bleeding. Sengstaken-Blakemore tube and TIPSS is recommended if this fails. Propranolol is used as bleeding prophylaxis.
Rules with PPI in regards to endoscopy?
Stop taking 2 weeks before as it can mask underlying pathology.
Inheritance pattern in hereditary haemochromatosis?
Haemochromatosis is an autosomal recessive disorder of iron absorption and metabolism resulting in iron accumulation. It is caused by inheritance of mutations in the HFE gene on both copies of chromosome 6
Epidemiology of haemochromatosis?
1 in 10 people of European descent carry a mutation in the genes affecting iron metabolism, mainly HFE
Early symptoms of haemachromatosis?
early symptoms include fatigue, erectile dysfunction and arthralgia (often of the hands)
Bronze diabetes
What are the reversible complications of haemochromatosis? 2
Cardiomyopathy
Skin Pigmentation
What are the irreversible complications of haemochromatosis? 4
Diabetes Mellitus
Hypogonadotrophic hypogonadism
Arthropathy
Liver Cirrhosis
Classic presentation of enterotoxigenic E.coli?
Watery travellers diarrhoea with stomach cramps and nausea, think Enterotoxigenic E. coli.
How to rule out the causative organism in diarrhoea questions?
Divide into Bloody vs non bloody
Diarrhoea in Camplyobacter Jejuni?
Bloody diarrhoea
Most common cause of pyogenic liver abscess?
S. aureus in kids
E. coli in adults
Investigation + Management plan of a pyogenic liver abscess?
CT scan
Drainage (typically percutaneous) and antibiotics
amoxicillin + ciprofloxacin + metronidazole
if penicillin allergic: ciprofloxacin + clindamycin
Surgical resection typically used when this fails
Features of a carcinoid syndrome?
Flushing (often earliest symptom)
Diarrhoea
bronchospasm
hypotension
right heart valvular stenosis (left heart can be affected in bronchial carcinoid)
other molecules such as ACTH and GHRH may also be secreted resulting in, for example, Cushing’s syndrome
pellagra can rarely develop as dietary tryptophan is diverted to serotonin by the tumour
What is pellagra?
Pellagra is a disease caused by low levels of niacin, also known as vitamin B-3. It’s marked by dementia, diarrhea, and dermatitis, also known as “the three Ds”. If left untreated, pellagra can be fatal.
Investigations and management for carcinoid tumours?
Investigation
urinary 5-HIAA
plasma chromogranin A
Management
somatostatin analogues e.g. octreotide
diarrhoea: cyproheptadine may help
Best tests to assess synthetic function of the liver?
Remember that ‘liver function tests’ do not always accurately reflect the synthetic function of the liver. This is best assessed by looking at the prothrombin time and albumin level.
What is H. pylori primarily associated with?
Main : Peptic ulcer disease (95% of duodenal ulcers, 75% of gastric ulcers)
Gastric cancer
B cell lymphoma of MALT tissue (eradication of H pylori results causes regression in 80% of patients)
atrophic gastritis
Biggest modifiable risk factor for reducing episodes in Crohns?
Stop smoking
How to induce remission in Crohn’s Disease?
Glucocorticoids (oral, topical or intravenous) are generally used to induce remission. Budesonide is an alternative in a subgroup of patients
5-ASA drugs (e.g. mesalazine) are used second-line to glucocorticoids but are not as effective
azathioprine or mercaptopurine* may be used as an add-on medication to induce remission but is not used as monotherapy.
infliximab is useful in refractory disease and fistulating Crohn’s.
Patients typically continue on azathioprine or methotrexate.
metronidazole is often used for isolated peri-anal disease.
How do you maintain remission in Crohn’s?
Azathioprine or mercaptopurine is used first-line to maintain remission
Methotrexate is used second-line
5-ASA drugs (e.g. mesalazine) should be considered if a patient has had previous surgery
Complications of Crohn’s Disease?
small bowel cancer
colorectal cancer
Osteoporosis
What do you need to do before giving Azathioprine or Mercaptopurine for Crohn’s ?
Assess thiopurine methyltransferase (TPMT) activity before offering azathioprine or mercaptopurine
What is the single laboratory finding that should prompt an immediate consideration of liver cirrhosis and urgent review by hepatology?
Thrombocytopenia (platelet count <150,000 mm^3) is the most sensitive and specific lab finding for diagnosis of liver cirrhosis in those with chronic liver disease
How do you diagnose liver cirrhosis?
Other techniques such as transient elastography (Fibroscan) and acoustic Radiation force impulse imaging are increasingly used and were recommended by NICE in their 2016 guidelines
For patients with NAFLD, NICE recommend using the enhanced liver fibrosis score to screen for patients who need further testing
Liver biopsy used to be used however this has a bleeding risk
What is transient elastography (Fibroscan)?
Uses a 50-MHz wave is passed into the liver from a small
transducer on the end of an ultrasound probe
Measures the ‘stiffness’ of the liver which is a proxy for fibrosis
Epidemiology and aetiology of cyclical vomiting syndrome?
Epidemiology
Rare
More common in children than adults
Females are slightly more affected than males
Aetiology
Unknown
80% of children and 25% of adults who develop CVS also have migraines
Presentation
Severe nausea and sudden vomiting lasting hours to days
Prodromal intense sweating and nausea
Well in between episodes
Investigations and management for cyclical vomiting syndrome?
Investigations
Clinical Diagnosis
A pregnancy test may be considered in women
Routine blood tests to exclude any underlying conditions
Management
Avoidance of triggers
Prophylactic treatments include amitriptyline, propranolol and topiramate.
Ondansetron, prochlorperazine and triptans in acute episodes.
What can cause Budd-Chiari Syndrome?
Polycythaemia rubra vera
Thrombophilia: activated protein C resistance, antithrombin III deficiency, protein C & S deficiencies
Pregnancy
Oral contraceptive pill
How can you investigate Budd-Chiari syndrome?
Ultrasound with Doppler flow studies is very sensitive and should be the initial radiological investigation
A transjugular intrahepatic portosystemic shunt procedure connects which two vessels?
Hepatic Vein and Portal vein
However it can connect the hepatic vein to IVC
Ultimately bypassing the liver.
Investigations and Management for C. difficile?
Diagnosis
is made by detecting Clostridium difficile toxin (CDT) in the stool
Clostridium difficile antigen positivity only shows exposure to the bacteria, rather than current infection
Management
first-line therapy is oral metronidazole for 10-14 days
if severe or not responding to metronidazole then oral vancomycin may be used
fidaxomicin may also be used for patients who are not responding , particularly those with multiple co-morbidities.
For life-threatening infections a combination of oral vancomycin and intravenous metronidazole should be used
Typically isolate for 48 hrs
Management for pharyngeal pouch
Surgery
Management for autoimmune hepatitis?
Steroids, immunosuppressants like azathioprine can also be used.
Liver transplantation
Amenorrhoea
ANA/smooth muscle antibodies/LKM1 antibodies, raised IgG levels
liver biopsy: inflammation extending beyond limiting plate ‘piecemeal necrosis’, bridging necrosis
Autoimmune hepatitis
How many types of autoimmune hepatitis are there and describe them?
3
Type 1: Anti-nuclear antibodies (ANA) and/or anti-smooth muscle antibodies (SMA). Affects both adults and children
Type 2: Anti-liver/kidney microsomal type 1 antibodies (LKM1)
Affects children only
Type 3: Soluble liver-kidney antigen
Affects adults in middle-age
How is Hepatitis A transmitted?
Shellfish, in particular, are common sources of hepatitis A infections, as the virus is transmitted via the faecal-oral route. It is usually self-limiting and is not associated with chronicity. Importantly, Hepatitis A can be prevented through vaccinations.
Incubation period of 2-4 weeks.
What are the drugs that can cause pancreatitis?
Azathioprine mesalazine didanosine bendroflumethiazide furosemide pentamidine steroids sodium valproate
My Drug bendroflumethiazide finds APVs
First line investigations in Coeliac?
Tissue transglutaminase (TTG) antibodies (IgA) are first-choice according to NICE
Endomyseal antibody (IgA)
anti-gliadin antibody (IgA or IgG) tests are not recommended by NICE
anti-casein antibodies are also found in some patients
Make sure the patient has gluten in their diet ( you might need to ask them to reintroduce it to their diet)
What is intussuception?
Intussusception is a condition in which one segment of intestine “telescopes” inside of another, causing an intestinal obstruction (blockage).
Inheritance pattern of Peutz- Jeghers syndrome and patterns?
Autosomal dominant - responsible gene encodes serine threonine kinase LKB1 or STK11.
Features
hamartomatous polyps in GI tract (mainly small bowel)
pigmented lesions on lips, oral mucosa, face, palms and soles
intestinal obstruction e.g. intussusception
gastrointestinal bleeding
What is the main benefit of prescribing albumin when treating large volume ascites’?
An albumin infusion is used when draining large volumes of fluid via paracentesis as it has benefit in reducing paracentesis-induced circulatory dysfunction and mortality when compared to alternative treatments.
What is used to group the causes of ascites?
Serum albumin ascites gradient (SAAG):
<11 g/L or a gradient >11g/L
SAAG > 11g/L indicates portal hypertension but also can point to cirrhosis, Budd- Chiari, Alcoholic hepatitis…
What is the management of ascites?
Management
Reducing dietary sodium
Fluid restriction is sometimes recommended if the sodium is < 125 mmol/L
Aldosterone antagonists: e.g. spironolactone
Drainage if tense ascites (therapeutic abdominal paracentesis): large-volume paracentesis for the treatment of ascites requires albumin ‘cover’.
Prophylactic antibiotics to reduce the risk of SBP.
NICE recommend: ‘Offer prophylactic oral ciprofloxacin or norfloxacin for people with cirrhosis and ascites with an ascitic protein of 15 g/litre or less, until the ascites has resolved’
a transjugular intrahepatic portosystemic shunt (TIPS) may be considered in some patients
Dysphagia that affects both solids and liquids from the start
Achalasia
Signs and symptoms of scurvy?
Vitamin C deficiency
Ecchymosis, easy bruising Poor wound healing Gingivitis with bleeding and receding gums Sjogren's syndrome Arthralgia Oedema
Abdominal pain, rectal bleeding and diarrhoea
Pain worse after eating a larger meal
History of HTN/IHD
Ischemic colitis
Particularly at the splenic flexure (watershed area)
near where the SMA blood supply changes to the IMA. Add to this the pain gets worse after eating, when the bowel requires more blood flow for its increased energy demands for digestion and ischaemic colitis would be the diagnosis to investigate first.
Investigation of choice for ischaemic colitis?
CT (gold standard)
‘thumbprinting’ may be seen on abdominal x-ray due to mucosal oedema/haemorrhage
Chronic liver failure who then progresses to develop renal failure.
Hepatorenal syndrome
Hepatorenal syndrome is split into type 1 and 2. Type 1 is a rapid onset hepatorenal syndrome (less than two weeks). This typically occurs following an acute event such as an upper GI bleed. Type 2 is a more gradual decline in renal function and is generally associated with refractory ascites.
Pathophysiology of Hepatorenal syndrome?
Vasoactive mediators cause splanchnic vasodilation which in turn reduces the systemic vascular resistance. This results in ‘underfilling’ of the kidneys. This is sensed by the juxtaglomerular apparatus which then activates the renin-angiotensin-aldosterone system, causing renal vasoconstriction which is not enough to counterbalance the effects of the splanchnic vasodilation.