Diarrhoea, constipation and GI care Flashcards

(49 cards)

1
Q

How do we define diarrhoea

A

A change in bowel habit
Substantially more frequent and looser stools than usual
Consistency more significant than frequency
World Health Organization 2017 “the passage of three or more loose or liquid stools per day (or more frequent passage than is normal for the individual)”
Can be categorised as:
Acute - < 14 days
Persistent - > 14 days but less than 28 days
Chronic > 28 days

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2
Q

What is the pathophysiology of diarrhoea (ie. what mechanisms cause it)

A

Increased osmotic load in gut lumen

Increase in secretion

Inflammation of intestinal lining

Increased intestinal motility

More than one of these mechanisms can cause it

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3
Q

What causes actue diarrhoea

A

Usually due to infection or ingestion of toxins (contaminated food)

Infection:
Bacterial e.g. Campylobacter, Escherischia coli, Salmonella
Viruses e.g. rotavirus or norovirus

Other causes drugs, parasites, anxiety

Most cases – self-limiting and resolve within 72 hours

We can give treatments for symptomatic relief

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4
Q

What notable diseases cause actue diarrhoea

A

Dysentery
Food poisoning
Rotavirus uncommen in adults
Norovirus common cause winter vomiting bug

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5
Q

What is travellers diarrhoea

A

Diarrhoea experienced by travellers or holiday makers
We should consider destination, age, diet

Early onset, usually within first few days of trip

Symptoms as per acute diarrhoea but can also have blood diarrhoea (in the cases of dysentery)

Usually resolve within 7 days

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6
Q

What organisms can cause travellers diarrhoea

A
Causes include:
Enterotoxigenic Escherichia coli (ETEC), Campylobacter
Salmonella
Enterohaemorrhagic E coli and Shigella,
Viruses, protozoa and helminths

Some infections e.g. giardiasis and amoebic dysentery can cause persistent or recurrent diarrhoea or systemic complications

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7
Q

How can we prevent and treat travellers diarrhoea

A

Antibiotic prophylaxis is rarely recommended

Hygiene, food and drink advice including:
Wash hands thoroughly using soap
Antiseptic wipes/gel if no washing facilities available
Avoid drinking local water, even for cleaning teeth
Avoid ice cubes, dairy products, ice cream, home distilled drinks and salads
Fresh foods. “Cook it, boil it, peel it or leave it”
Avoid fish and shellfish unless sure fresh and not been near sewage outlet
Clean, hygienically run establishments

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8
Q

What can cause chronic diarrhoea

A

Many potential causes including:
Irritable bowel syndrome (IBS)
Inflammatory bowel disease (IBD)
Malabsorption syndromes e.g. coeliac disease, lactose intolerance
Metabolic disease e.g. diabetes, hyperthyroidism
Laxative abuse

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9
Q

What kind of questions must we ask people presenting with diarrhoea

A
Stool frequency
Nature e.g. blood, mucus
Occurrence – isolated or recurrent
Duration
Onset
Timing 
Food
Recent travel
Medication
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10
Q

When should we refer adults with diarrhoea

A

If the symptoms are present for:
> 72 hours in healthy adults
> 48 hours in elderly
> 24 hours if diabetic

Associated severe vomiting and fever

History of change in bowel habit

Blood or mucus in stools

Suspected ADR

Alternating diarrhoea and constipation in elderly – could be faecal impaction

Weight loss

Recent hospital treatment or antibiotic treatment (may have c. difficile)

Evidence of dehydration

Severe pain/rectal pain

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11
Q

How do we treat minor diarrhoea

A

Primary aim is to prevent dehydration

Treatments include:
Oral Rehydration Therapy
Loperamide
Morphine
Diphenoxylate
Adsorbents
Antibiotics
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12
Q

What considerations must be thought of when designing oral rehydration therapies

A

Oral rehydration solutions (ORSs) should:

enhance the absorption of water and electrolytes

replace electrolyte deficit adequately and safely

contain alkalinising agent to counter acidosis

be slightly hypo-osmolar (about 250 mmol/litre) to prevent the possible induction of osmotic diarrhoea

be simple to use in hospital and at home
be palatable and acceptable, especially to children

be readily available

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13
Q

What are oral rehydration therapies made of

A

Generally contain:

Sodium and potassium to replace essential ions

Citrate and/or bicarbonate to correct acidosis

Glucose or another carbohydrate e.g. rice starch

(we must monitor diabetics carefully)

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14
Q

What is the pharmaclogy of loperamide

A

Synthetic opioid analogue - µ (mu) opioid receptor agonist (not much enters systemic circulation)
Direct action on opiate receptors in the gut wall
Extensive first-pass metabolism therefore little reaches systemic circulation

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15
Q

What are the doses of loperamide

A

Adult dose: Initially 4 mg, followed by 2 mg for up to 5 days, dose to be taken after each loose stool; usual dose 6–8 mg daily; maximum 16 mg per day.

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16
Q

What are the contraindications of loperaide an when should it be avoided

A

Contra-indications:
Active ulcerative colitis
Antibiotic associated colitis
Conditions where inhibition of peristalsis should be avoided
Conditions where abdominal distension develops

Avoid:
Bloody/suspected inflammatory diarrhoea
Significant abdominal pain

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17
Q

Why can loperamide be misused

A

It has a mild opioid affect which can be abused in very high doses. Causes serious cardiac adverse reactions though

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18
Q

When should anibiotics be used and whe shouldnt they be used to treat diarrhoea

A

Stool sample should be taken and causative organism identified before antibiotic given

Can also be used in severe infection (fever > 39oC and prolonged symptoms, in the elderly or immunocompromised)

Empiric use not recommended

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19
Q

What other drugs can we use to slow down the GI tract and hence reduce diarrhoeal symptoms (3)

A

Morphine
Direct action intestinal smooth muscle
Morphine content per recommended dose of products available OTC for diarrhoea ranges 0.5-1mg - ? effective

Diphenoxylate
Synthetic derivative of pethidine
Available as combination product – co-phenotrope (diphenoxylate hydrochloride 2.5mg/atropine 25mcg)

Adsorbents
Adsorb microbial toxins and micro-organisms
Kaolin (Kaolin and Morphine)
Bismuth subsalicylate

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20
Q

What advice should pharmacists give to patients presenting with diarrhoea

A
General management:
Plenty of clear fluids
Avoid drinks high in sugar
Avoid milk and milky drinks
Eat light, easily digested food

If gastroenteritis – infections. Precautions including not returning to work until symptom free for 48 hours, hygiene advice and cleaning of sanitary equipment

Note - Diarrhoea can reduce absorption of some medicines so it is important to check their medication history and advise accordingly

21
Q

What is c. difficile and how does it link to diarrhoea

A

Clostridium difficile – spore producing anaerobic Gram-positive anaerobic bacterium

Asymptomatic commensal in 2-3% adult population

Patients prescribed antimicrobials- leading cause of antibiotic associated diarrhoea and can lead to pseudomembranous colitis

Common cause of healthcare-associated infections

22
Q

What are the risk factors for c. difficile (both antibiotic associated and general risk factors)

A

Risk factors for Clostridium difficile infection (CDI) include:

Antimicrobial choice - Use of broad‑spectrum antibiotics is associated with an increased incidence of Clostridium difficile infection.

Strongly associated with the infection were clindamycin, cephalosporins and quinolones.

However, the interpretation of data on the risk of C. difficile with different antibiotics is extremely difficult
Antimicrobial duration

Acid-suppressing medications e.g. Proton Pump Inhibitors (PPIs) - altered gi environent
Age (older)
Hospitisation
Length of stay in hospital
Recent hospitalisation
Underlying morbidities e.g. do they have any co-morbidities

23
Q

How do we manage c. diff infection

A

Stop acid-suppressing medication where possible (PPIs)

Stop concomitant antimicrobials if clinically appropriate

Stop any antimotility medicines e.g. loperamide (causes accumulation of the bacteria in the gut)

Maintain adequate fluid balance and avoid dehydration

Targeted C difficile antimicrobial treatment

Appropriate infection control procedures including handwashing (with soap and water) and isolation

24
Q

How do we treat c. diff

A

Targeted antimicrobial treatment

Oral Metronidazole

  • First-line for mild-moderate CDI
  • Oral – 400mg tablet three times a day for 10-14 days

Oral Vancomycin

  • Severe disease (can be used in mild-moderate as well)
  • Oral – 125mg every 6 hours (can give up to 500mg every 6 hours)

Critically unwell – combination therapy of IV Metronidazole and oral Vancomycin

We dont wait for cultures before treatment - treat empirically first

Oral Fidaxomicin
Macrocyclic antibiotic – inhibits C difficile sporulation
Recurrent CDI and severe CDI with high risk recurrence
Oral – 200mg twice a day for 10 days
Sometimes used for recurrent infection

25
List 3 other treatments other than atimicrobials
Probiotics Restore gut microbiome Role uncertain in prevention and treatment Faecal Microbiota Transplant (FMT) Transplant from healthy donor Some evidence to support this Clinical trial stage Intravenous Immunoglobulin Severe or recurrent cases of colitis where other treatments failed
26
Define constipation
Passage of hard stools less frequently than normal Typically less than three bowel movements in one week
27
What are the symptoms of constipation and who is most commonly affected
``` Symptoms include: Abdominal discomfort and distension Abdominal cramping Bloating Nausea Difficulty passing stool ``` Affects people of all ages More common in: Women, particularly if pregnant Older people
28
What are the 2 different types of constipation
Functional (idiopathic) No anatomical or physiological cause known Secondary Induced by particular condition or medicine
29
What factors can lead to constipation
``` Non-medical factors which pre-dispose to constipation include Inadequate fluid intake Inadequate dietary fibre Dieting Changes in lifestyle Suppressing the urge to defecate ```
30
Name some conditions which can predispose a person to constipation
``` Coeliac disease Depression Diabetes GI obstruction Irritable bowel syndrome Parkinson’s disease Hypercalcaemia Hypokalaemia Hypothyroidism ```
31
Name some medicines which can predispose a person to constipation
Medications that can cause constipation include: Antacids containing aluminium and calcium Antihypertensives – diuretics, calcium channel blockers Antidepressants – tricyclics and some monoamine oxidase inhibitors Antimuscarinics – procyclidine, oxybutynin Antiparkinsonian medicines – levodopa, dopamine agonists, amantadine *Opioid analgesics* Iron
32
How do we assess a patient presenting with constipation
``` Bowel habit Examination Try to identify cause Check for red flags including; Unexplained weight loss Rectal bleeding Family history of colon cancer or IBD Signs of obstruction ```
33
What are the aims of constipation treatment
Aims: Restore normal frequency defecation Achieve regular, comfortable defecation Avoid laxative dependence Relieve discomfort
34
How do we treat constipation
``` Non-pharmacological: Consider primary cause Diet – increasing dietary fibre Ensuring adequate fluid intake Lifestyle measures including exercise ``` ``` Laxatives: Bulk-forming Stimulant Osmotic Faecal-softening ```
35
How do bulk-forming laxatives work
Increase faecal mass through water binding to stimulate peristalsis Take several days for full effect Maintain good fluid intake as they laxatives pull in water Can be used long-term in people prone to constipation Examples include: Ispaghula husk (fybogel) Methylcellulose (also acts as softener)
36
How do stimulant laxatives work
Increase intestinal motility via muscle contractions Work within a few hours (advise to take before bedtime, should work by morning) Can cause abdominal cramps due to increased peristalsis Avoid prolonged use – can lead to diarrhoea, fluid and electrolyte imbalance Examples include: Senna Dantron (terminally ill patients only) Bisacodyl
37
How do osmotic laxatives work
Work within colonic lumen to retain and draw water into intestine by osmosis to help soften and pass the stool Patient must maintain good fluid intake Macrogel powders –1-3 days to work Lactulose (semi-synthetic disaccharide) – 2-3 days to work (dose is lower than the dose given in liver disease) Phosphate enema or suppository – 15-30 minutes to work Magnesium hydroxide – 3-6 hours to work
38
How do faecal softening laxatives work
Stimulate peristalsis by increasing faecal mass: act to lower surface tension and allow water and fats to penetrate faeces Docusate sodium acts as faecal softener and stimulant – works within 1-3 days Glycerol suppository – works within one hour Arachis (peanut) oil enema – works within 30 minutes. Not to be used if nut allergy
39
What are some complications of constipation
Faecal Impaction Haemorrhoids Rectal prolapse Anal fissures
40
What is coeliac disease
An autoimmune condition affecting the small intestine. Has a genetic predisposition aspect and has environmental triggers Body’s immune system attacks itself when gluten is eaten (adverse reaction to gluten) The reaction is not an allergic reaction and does not cause anaphylactic shock (so its not an allergy or intolerance) Affects 1% of Northern Europeans and Northern Americans
41
How do we diagnose coeliac disease (not examined)
Serology IgA tTG vs IgA EMA (parts of the immune system) Endoscopy for small intestinal biopsy 2nd part of duodenum At least 4 large biopsies – well orientated Repeat biopsy on gluten-free diet Gluten challenge (>10g per day, 6/52)
42
What are the symptoms of coeliac disease
Not every patient has symptoms Vary person to person from mild – severe ``` Include: Headaches Diarrhoea Abdominal pain Lethargy ``` The symptoms may last from a few hours to a few days
43
What are the complications of undiagnosed coeliac disease
Long term malabsorption and osteoporosis Refractory coeliac disease Ulcerative jejunitis Enteropathy associated T cell lymphoma Autoimmune disease -T1DM, Autoimmune thyroid disease The longer you continue eating gluten the more your risk of triggering another autoimmune disease.
44
How do we manage coeliac disease
There is no cure and the treatment is a life long gluten-free diet All fresh meat, fish, cheese, eggs, milk, fruit and vegetables are gluten-free Specially-manufactured wheat starch is used in the gluten-free diet The Crossed Grain symbol is internationally recognised by those who have to follow a gluten-free diet.
45
Why is there low compliance with the gluten free diet
``` Taste- poor compliance in adolescents Expensive Difficult to eat out No agreed international consensus on permissible levels Range of symptoms with ingestion Nutritional aspects Low fibre Low vitamin D High calories ```
46
Can gluten free products be provided on prescription
As of 4th December 2018, the prescribing of gluten-free (GF) foods on the NHS in England will be restricted to bread and mixes only
47
Define IBS
Its a chronic condition of at least 6 months of abdominal pain and bowel symptoms (diarrhoea, constipation or combination of both) Cause unclear and can differ patient to patient Poorly understood Treatment aimed at symptomatic relief
48
How do we treat IBS
Number of different medications can be used No “gold standard” as symptoms vary Treatments include: Dietary changes and exercise Antispasmodics for cramping pain e.g. mebeverine, hyoscine, peppermint oil Anti-diarrhoeal e.g. Loperamide Laxatives e.g. bulk-forming, stimulant, osmotic Probiotics
49
What are antispasmotics and give two example of them
Smooth muscle relaxants Mebeverine is commonest prescribed drug for IBS in the UK Modified release capsule – 200mg twice daily Tends to be well tolerated Peppermint oil capsules can also be used – taken three times daily