Tutorial title - Intestines - Diarrhea
16 important questions on Tutorial title - Intestines - Diarrhea
What induces massive secretory diarrhea and what is often required to manage it?
- Exposure to toxins from several types of bacteria, such as E. coli heat-labile toxin, induces the same series of steps and massive secretory diarrhea that is often lethal unless the person is aggressively treated to maintain hydration.
What effect does Vibrio cholerae have on adenyl cyclase and cyclic AMP?
- Vibrio cholerae produces cholera toxin, which strongly activates adenyl cyclase, causing a prolonged increase in intracellular concentration of cyclic AMP within crypt enterocytes.
- This change results in prolonged opening of the chloride channels that are instrumental in secretion of water from the crypts, allowing uncontrolled secretion of water.
What agents, besides bacterial toxins, can induce secretory diarrhea?
- some laxatives
- hormones
- drugs
- certain metals
- organic toxins
- plant products (e.g. arsenic, insecticides, mushroom toxins, caffeine)
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How does fasting affect secretory diarrhea in most cases?
How does cholera toxin affect the enteric nervous system?
- Additionally, cholera toxin affects the enteric nervous system, resulting in an independent stimulus of secretion.
- This contributes to the mechanism of secretory diarrhea by promoting further secretion of water, exacerbating the condition caused by the activation of adenyl cyclase and increased cyclic AMP levels.
What are the characteristics of dysmotility and hypomotility?
- Dysmotility involves increased motility and decreased transit time, leading to less absorption time, often presented as osmotic diarrhea.
- An example is IBS
- Hypomotility involves overflow diarrhea, episodes of diarrhea, and constipation. An example is diabetes causing nocturnal diarrhea.
What defines diarrhea and what are the key factors involved?
Diarrhea is defined as any state where there is a change in the consistency of the stool to a fluid stool, with increased frequency (at least 3 times), urgency, and incontinence.
Key factors include:
- Stool mass, frequency, or fluidity > 200g/day.
What is Exudative or Inflammatory Diarrhea?
- Inflammatory responses include increased exudation due to injury to the epithelial surface, leading to decreased digestion and absorption.
- This causes an osmotic effect.
- Exudation increases due to dilation and permeability.
- During repair, gap junctions are not tight, resulting in increased leakage (high permeability) and mimics secretory diarrhea.
- Mediators of inflammation (neurotransmitters) interact with the nerves in the lumen causing increased peristalsis (dysmotility diarrhea).
What are the infectious and non-infectious causes of diarrhea?
- Infective: Bacteria, viruses, parasites.
- Non-infective: Antibiotic use, stress.
What factors are considered in the history taking of diarrhea patient and assessment of dehydration?
History taking include:
- travel history
- area of residency
- stool composition/appearance
- medical history
- onset and duration
- frequency and volume.
- breathing assessment (tachypnea).
- skin turgor
- mucous membranes
- eyes (sunken)
- mental state
- urine output
- capillary refill time
- perfusion mottling
How is diarrhea classified based on duration?
- Acute: Less than 2 weeks.
- Persistent: 2-4 weeks.
- Chronic: More than 1 month.
What are the characteristics of malabsorption diarrhea and its features?
Malabsorption diarrhea involves processes where disturbances can occur, such as intraluminal digestion, terminal digestion, transcellular transport, and lymphatic transport of absorbed lipids.
Features include:
- Anemia and mucositis due to pyridoxine, folate or Vitamin B12 deficiency.
- Bleeding due to Vitamin
K deficiency
- Osteopenia and tetany due to Calcium, Magnesium or Vitamin D deficiency.
- Neuropathy due to deficiencies of Vitamin A or Vitamin B12.
What are the different pathogenetic mechanisms of diarrhea?
- Secretory
- Osmotic
- Dysmotility
- Exudative
What are the clinical features of diarrhea and fluid resuscitation methods?
Clinical features of diarrhea include:
- flatus
- abdominal pain.
- weight lose
- steatorrhea.
- weight loss,
- anorexia,
- abdominal distension,
- borborygmi,
- muscle wasting
Describe the secretory mechanism of diarrhea with an example.
- In secretory diarrhea, the rate of water secretion exceeds absorption.
- Isotonic stool.
- Example: Cholera, where the cholera toxin keeps the Cl⁻ channel open, allowing continuous secretion of water into the lumen, leading to dehydration. (Dehydration and reinfection perpetuates cholera).
- Shedding of epithelium of lumen gives the whitish color
- Persists during fasting.
Explain the osmotic mechanism of diarrhea and how it can be managed.
- Osmotic diarrhea occurs when an osmotically active substance in the lumen can't be absorbed, creating an osmotic gradient that draws water in.
- Example: Lactose intolerance.
- It can be cured with fasting as it is due to osmotic forces from unabsorbed solutes.
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