Diarrhoea Flashcards
(39 cards)
Describe the Bristol Stool Chart
-1= Hard lumps or pellets
-2= Lumpy and sausage shaped
-3= sausage shaped but with cracks on the surface
-4= smooth and sausage shaped
-5= separate, soft blobs with well defined edges
-6= Mushy with pieces of poo that have ragged or fluffy edges
-7= loose and watery- no solid pieces
What is diarrhoea?
Diarrhoea is the passage of three or more loose or liquid stools per day (or more frequently than is normal for the individual).
-Acute diarrhoea is defined as lasting less than 14 days.
-Persistent diarrhoea is defined as lasting more than 14 days.
-Chronic diarrhoea is defined as lasting for more than 4 weeks.
Presenting complaint
-What is normal for them
=Frequency?
=Consistency?
-Appearance
=Steatorrhea (fat malabsorption)
=Green/brown/orange- small bowel bacterial overgrowth
-How has this changed
=Duration?
=Progressive?
-How has this affected them- what is a bad day like?
=Urgency
=Nocturnal activity (inflammation)
=Housebound?
Further history of presenting complaint
-Bleeding
=Fresh, mixed in, clots
=NB haemorrhoids (wiping)
=Tenesmus (incomplete emptying- colorectal cancer)
-Weight loss
-Diet
=Energy drinks, additives, FODMAPS, caffeine, liquorice= alter gut transit
-Abnormal defecation behaviour
=Straining
=time on toilet
=manual evacuation
Past history and social history
-Occupation (primary school teachers- parasite)
-Family history (colorectal cancer- Amsterdam criteria, IBD, Coeliac)
-Past medical
=Vascular (mesenteric ischaemia), diabetes (autonomic neuropathy, nerve supply damage)
-Previous surgery
=gastrectomy
-Travel
=Counties visited in last 2 years
=Ever lived abroad
-Drug history
-Incontinence
Common culprit drugs with diarrhoea side effects
-Antibiotics
-Antidepressants
-NSAIDs
-Antihypertensives
-Diuretics
-Anticonvulsants
-Lipid lowering drugs
-Anti-diabetic treatment (metformin)
-PPIs/H2-blockers
-Alcohol
-Magnesium supplements
-Colchicine (anti-gout)
Definition of acute diarrhoea
-Change in stool consistency for <4 weeks
Common causes of acute diarrhoea
-INFECTION
-Campylobacter
-Norovirus
-Salmonella
-E. Coli
-Shigella
-Giardia, amoebiasis
-NB immunodeficiency/ HIV
-Drugs
-Gastroenteritis (abdo pain, nausea/vomiting)
-Diverticulitis (classically causes LLQ pain, diarrhoea, fever)
-Abx therapy (broad spectrum, c.diff)
-Constipation causing overflow (faecal incontinence)
-Medication
-Anxiety
-Food allergy
-Acute appendicitis
Definition of chronic diarrhoea
-Change in stool consistency for >4 weeks
Common causes of chronic diarrhoea
-Coeliac disease
-Irritable Bowel Syndrome (Rome criteria)
-Overflow diarrhoea
-Drugs
-Diet
-Colon cancer
-Thyroid disease
-Inflammatory bowel disease (UC bloody diarrhoea, cramps, weight loss, urgency and tenesmus vs Crohn’s: crampy, diarrhoea, ulcers, perianal, obstruction)
Less common causes of chronic diarrhoea
-Infection
-Microscopic colitis
-Ischaemic colitis
-Diabetes
-Small intestinal bacterial overgrowth (SIBO)
-Pancreatic insufficiency
-Bile acid malabsorption
-Post-Radiotherapy enteritis
-Small bowel lymphoma
-Thyrotoxicosis
-Appendicitis
Rare causes of chronic diarrhoea
-Vasculitis
-Laxative abuse
-Neuro-endocrine tumours
-Post-gastric surgery
Faecal calprotectin
-Calprotectin= protein released by immune cells (neutrophils)- shed into stool
-Correlates with small and large inflammation
-Altered bowel habits
-Monitoring inflammatory disorders
-Less than 20-50 microgram/g
IBS diet
-Exclude gluten
-FODMAP containing foods= exacerbate
Coeliac disease diagnosis
-Anti tTG >2000
-Low haemoglobin and ferritin (iron deficiency anaemia)
-Autoimmune conditions
-Dermatitis herpetiformis rash
=gluten free diet
=dexa bone scan for long-standing malabsorption, osteopenia (significant weight loss)
IBD presentation
-Erythema nodosum rash on shins/legs (painful purple lesions and raised)
-Elevated faecal calprotectin
-Weight loss
-Urgency, incontinence, nocturnal
-Biopsy and colonoscopy
Overflow diarrhoea
-Due to constipation
-Explosive watery diarrhoea, maybe incontinence
-Impacted stool on PR
-Faecal loading in large intestine
-Ondanstron= slows gut transit
-Opiates slows gut transit
Pancreatic insufficiency/ pancreatitis
-Faecal elastase low (released by pancreas, 200-500micrograms/g)
-Malabsorption on vitamins
-History alcohol abuse
-Atrophic pancreas, high density areas of calcium deposits
-Change in colour and consistency, steatorrhea (exocrine)
-High BM- insulin insufficiency (endocrine)
-Control blood sugar
-Replace enzymes taking capsule with every meal
Overview of Ischaemic colitis
Ischaemic colitis describes an acute but transient compromise in the blood flow to the large bowel. This may lead to inflammation, ulceration and haemorrhage. It is more likely to occur in ‘watershed’ areas such as the splenic flexure that are located at the borders of the territory supplied by the superior and inferior mesenteric arteries.
-Progressive abdominal pain
-Blood when pain is bad
-Worse 1-2hrs after eating
-Previous vascular disease
-X-ray: ‘thumbprinting’ may be seen on abdominal x-ray due to mucosal oedema/haemorrhage
-CT contrast= narrowing coeliac axis= mesenteric angina/ ischaemia (plaque)
-Vascular MDT
-Optimising risk factors
Bloods investigations
-FBC
-U&E (dehydration with significant diarrhoea, CKD)
-LFT (GGT)= biliary/pancreatic causes
-High platelet count= inflammatory element
-CRP= inflammatory
-ALB= inflammatory, nutritional marker (lower= inflammation)
-TFTs (thyrotoxicosis)
-BM/lab glucose (diabetes/ pancreatic insufficiency/ endocrine dysfunction)
-HbA1c
-Anti-tTG-IgA (coeliac)
-B12/Folate/Ferritin (if anaemic- blood loss?)
-HIV
-Calcium/magnesium (chronic electrolyte loss)
-7a-cholestonone (bile acid malabsorption)
Stool investigations
-MC&S x3
-Enteric parasites
-Calprotectin (IBS vs IBD)
-Elastase (low= pancreatic insufficiency)
the patient is systemically unwell and needs hospital admission, +/- antibiotics
blood or pus in the stool
immunocompromised
recently received antibiotics, a proton pump inhibitor (PPI) or been in hospital
recent foreign travel
public health indication: diarrhoea in high-risk people (for example food handlers, healthcare workers, elderly residents in care homes), suspected food poisoning (for example after a barbeque, restaurant meal, or eating eggs, chicken, or shellfish)
Imaging investigations
-CT colonoscopy
-CT CAP (pancreatic lesions, cancer, bile)
-SB MRI (vascular supply, flow limiting ischaemia)
-AXR
Endoscopy
-Colonoscopy (cancer)
-Upper GI endoscopy
-Capsule endoscopy
Investigations of colorectal cancer/ IBD suspected
-Colonoscopy
-+/- ileoscopy and biopsies
-Consider flexible sigmoidoscopy in younger patients