Presents
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Transcript of Presents
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PresentsMushroom Toxin
7
Click to Proceed
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OBJECTIVES
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Identify different kinds of mushroom that has toxin;
Explain the effects of these toxins in our body;
Characterize the mushroom from its appearance.
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CausesEffectsPoisonings
tiozonpadua Pastor
Mushroom
Objectives
BACK
TOXIC
Visitor!
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Another term for mushroom poisoning. This refers to harmful effects from ingestion
of toxic substances present in a mushroom.
MycetismBack Next
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These symptoms can vary from slight
gastrointestinal discomfort to death.
MycetismBack Next
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The toxins present are secondary
metabolites produced in specific
biochemical pathways in the fungal cells
MycetismBack Next
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Fungi that are harmless to invertebrates can still be toxic to humans; the death cap, for instance, is often infested by insect larvae
The fly agaric, usually bright red to orange and/or yellow, is narcotic and hallucinogenic, there have been no reported human deaths; the deadly destroying angel, in contrast, is an unremarkable white.
Insects vs. mushrooms
No to brightly colored
FOLK TRADITIONS
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People who have eaten the deadly Amanitas reported that the mushrooms tasted
quite good.While it is true that some otherwise inedible species can be rendered safe by special preparation, many toxic species cannot be made toxin-free.
Taste bad
Just cook it!
FOLK TRADITIONS
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A number of Laotian
refugees were hospitalized after eating mushrooms
deemed safe by this
folklore rule and this
cost at least one person her life
The shape of the mushroom cap does not correlate with presence or absence of mushroom toxins, so this is not a reliable method to distinguish between edible and poisonous species
If it is red
Pointed vs. Flat-rounded
FOLK TRADITIONS
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Cap : Shape, Surface and Margins
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Gills :• Gills are described by the attachment pattern to the stalk
and by spacing, thickness, depth and forking pattern
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Stem/Stipe :
• Stipe features include size, color, color changes, shape, position, structure, and surface characteristics
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Causes Effects
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CausesOf the many thousands of mushroom species
in the world, only 32 have been associated with fatalities, and an additional 52 have been identified as containing significant toxins. By far the majority of mushroom poisonings are not fatal, but the majority of fatal poisonings
are attributable to the Amanita phalloides mushroom
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CausesA majority of these cases are due to "mistaken identity." One way
this can happen is that the victim attempts to apply folk knowledge
from one geographic area to another PROCEED
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Jack-o-Lantern
C.molybdite
s Coprine
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Amanitas
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Amanitas
DescriptionMistaken from
Coprinuscomatus when immature
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Puffball, an edible puffball mushroom, which closely resembles the immature Amanitas.
I’m not amanitasBack Next
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Foragers are encouraged to always cut the fruiting bodies of suspected puffballs in half, as this will reveal the outline
of a developing amanita should it be present within the
structure.
AmanitasBack Next
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Chlorophyllummolybdites
Sourceoften implicated
due to its preference for
growing in lawns
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C.molybdites causes severe
gastrointestinal upset but is not
considered deadly poisonous.
C.Molybdites
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C.molybdites causes severe
gastrointestinal upset but is not
considered deadly poisonous.
C.Molybdites
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C.molybdites causes severe
gastrointestinal upset but is not
considered deadly poisonous.
C.Molybdites
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A majority of mushroom poisonings in general are
the result of small children, especially toddlers in the "grazing" stage, ingesting mushrooms found in the
lawn.
C.Molybdites
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Jack-o-Lantern
DescriptionThey are sometimes
mistaken for chanterelles
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Omphalotus ssp., "Jack-o-lantern
mushrooms," are another cause of
sometimes significant toxicity
Jack-o-lanter nBack Next
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Both are bright orange and fruit
at the same time of year
Jack-o-lanter n
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Omphalotus grows on wood and has
true gills rather than the veins of
a Cantharellus.
Jack-o-lanter n
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Spot the diff!
Back Next
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Coprine
Sourcedisulfiram-like compound which is harmless unless
ingested within a few days of ingesting alcohol
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It inhibits aldehyde dehydrogenase, an enzyme required for
breaking down alcohol.
CoprineBack Next
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Thus the symptoms of toxicity are similar to being "hung over" – flushing, headache,
nausea, palpitations, and in severe cases, trouble
breathing
CoprineBack Next
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Effects, Symptoms, treatments
What are the effects of eating
those mushrooms
?The effects
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Group I - Cyclopeptide-containing Mushroom
• Most difficult to treat.
• 95% of all fatality due to mushroom poisoning
• Species include Amanita phalloides, A verna, A virosa, Gallerina Autumnalis
• Toxins include amanitins and phallotoxin which inhibit RNA polymerase II
• Toxin is stable to cooking, pickling, salting and is not hydrolyzed by digestion
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Group I - Cyclopeptide-containing Mushroom
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Group I - Cyclopeptide-containing Mushroom
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Amatoxin Clinical Effects :
• Delay of 6 to 12 hours before initial symptoms is common
• Phase 1: Severe Gastroenteritis- profuse watery diarrhoea, nausea, vomiting, thirst,
• Phase 2: transient improvement in symptoms– Latent period of web being lasting 1 to 5 days
• Phase 3: Recurrence symptoms, manifested with hepatic, renal toxicity, seizures, coma and death
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Amatoxins - Treatment :• Toxin elimination via repeat dose charcoal • Supportive care with fluids, electrolytes • Penicillin G may displace amanitin from plasma
binding sites 1 million Unit/kg/d • Thioctic acid • Silymarin compete for membrane transport • Liver Transplant • Forced diuresis, hemodialysis, plasmapheresis-
– Not useful
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Group II Monomethylhydrazine containing Mushrooms :
• Gyromitra esculenta, G californica• Brain like appearance• Gyromitrin: Chelate with pyridoxal phosphate- disrupt
GABA function
• Clinical Effects: long latent period of 6 to 12 hours followed by vomiting, watery diarrhea, abdominal pain, weakness and headache.
• Severe cases notable for jaundice, hyperreflexia, vertigo, loss of muscle coordination, seizures and coma
• Recovery in 2 to 6 days
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Group II Monomethylhydrazine containing Mushrooms :
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Gyromitra esculenta
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Treatment • Standard decontamination
measures • For seizures, Pyridoxine at
25mg/kg in 15 to 30 minutes IV.
Group II Monomethylhydrazine containing Mushrooms :
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Group III- Muscarine containing:
• Clitocybe dealbata, Omphalotus olearius• Toxin is muscarine which stimulates
postganglion parasympathic fibers
Omphalotus olearius
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Group III- Muscarine containing:
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Group III- Muscarine containing:
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Group III- Muscarine containing:
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Muscarine Clinical Effects:
• Onset within 30 to 120 minutes
• Clinical Feature: like OP Poisoning
• Recovery in 6 to 24 hours
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Muscarine Treatment :
• Standard decontamination methods • In symptomatic patients
–Atropine 1mg to 2mg for adults –and children
• 0 to 2 years .2 mg • 3 to 4 years .3 mg • 5 to 10 years .4mg
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Group IV – Coprine-containing Mushrooms :
• Coprinus atramentarius “Inky caps”• Toxin is coprine, • The metabolite of which inhibits aldehyde
dehydrogenase • Ingestion is asymptomatic unless ethanol is
consumed in the following 2 hours to 5 days– Disulfiram like effect
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Coprine Treatment :
• Decontamination • Symptomatic treatment
–B-blockers or sedatives for anxiety and tachycardia
• Fluids for hypotension
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Group V - Muscimol/Ibotenic Acid-containing Mushrooms :
• Amanita Muscaria, Amanita Pantherina, Amanita Gemmata
• Toxin is Ibotenic acid which is metabolized to Muscimol
• Muscimol is a false neurotransmitter which stimulates GABA receptors and usually results in anticholinergic symptoms
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Ibotenic acid
Muscimol
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Clinical Effects :
• Onset within 30 to 90 minutes, most marked at 2 to 3 hours
• Drowsiness, confusion resembling alcohol intoxication, dizziness, ataxia, euphoria, muscle cramps and spasms, delirium, visual disturbances, hallucinations
• Vomiting is rare • Deep sleep or coma terminates the episode which
usually lasts from 4 to 8 hours
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Musicmol/Ibotenic Acid Treatment :
• Standard decontamination measures • Support airway and hemodynamics with
standard measures • With life threatening anticholinergic
signs, consider physostigmine .5 to 2 mg slow IVP over 5 minutes
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Group VI - Psilocybin containing Mushrooms:
• Psilocybe caerulescens, Panaeolus, Gymnopolis
• “Magic mushrooms” • Toxins are Psilocybin and its metabolite
psilocin • Effects are serotonin and norepinephrine
mediated • Effects like LSD
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Psilocybe caerulescens
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Psilocybin Clinical Effects :• Onset of symptoms within 30 to 60
minutes, occasionally as late as 3 hours
• Symptoms include hallucination, impaired judgement, hyperkinesis, laughter, vertigo, ataxia, muscle weakness and drowsiness
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Psilocybin Treatment :
• Decontamination not recommended as this may increase agitation
• Rest and reassurance in a dark, quiet room
• Consider benzodiazepines for severe anxiety
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Group VII - GI Irritants :
• Largest group with a diverse type of mushrooms (little brown mushrooms)
• Chlorophyllum molybdites, Agaricus Xanthodermis, Russula Emetica
• No specific toxins identified • Most mushrooms cause more symptoms when
eaten raw
• Onset of symptoms within 30 minutes to 2 hours after ingestion
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Chlorophyllum molybdites
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GI Irritants Treatment :
• Standard decontamination measures • Beware of antiemetics and
antidiarrheals as these may have unpredictable interactions with mushroom toxins
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Group VIII- Orelline & Orellanine-containing Mushrooms :
• Cortinarius species - over 1000 in the US
• Causes severe renal tubular damage resulting in reduced GFR, decreased absorption of water/NA/K, proteinuria, glucosuria
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Cortinarius armillatus
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Orellanine Clinical Effects :• Initial mild gastroenteritis • Long latent period of 36 hours to 21 days • Symptoms include severe thirst, abdominal or
flank pain, chills and fever • Progresses to acute renal failure. • Chronic failure occurs in 50% of cases • Recovery takes weeks to months
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Orellanine Treatment :
• Standard decontamination • Hemodialysis • Renal transplant • Steroids, hemoperfusion, and
forced diuresis do not improve outcome
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Who are the famous people
poisoned by mushroom?
Take the Test
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Daniel Farenheit
’sParents
EmperorClaudius
NicholasEvansBack
Famous Poisonings
Buddha
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Siddartha GautamaBuddha
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Buddhaby some accounts, may have died of mushroom poisoning around ~479 BCE,though this claim has not been universally
acceptedPROCEEDMENU
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Emperor Claudius
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Emperor Claudiussaid to have been murdered by being
fed the death cap mushroom. However this story first appeared
some two centuries after the events, and it is even debatable whether
Claudius was murdered at all.PROCEEDMENU
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Daniel Farenheit’s
Parents
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Daniel Farenheit’s parents
died in Danzig on 14 August 1701 from accidentally eating
poisonous mushrooms.PROCEEDMENU
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Nicholas Evans
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Nicholas EvansThe best-selling author Nicholas
Evans (The Horse Whisperer) was poisoned after
eating Cortinariusspeciosissimus
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Mushroom hunting is a true sport: The fungi do have an equal chance to win. If we are correct in our identification, at very best we win a tasty side-dish, or an optimally seasoned main course. On the other hand, if we are not correct, we win repeated trips to the head, maybe a trip to the emergency room, and in the extreme, a trip to the mortuary .
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Thank you for
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