NousDefionsDoc
02-02-2004, 22:18
Ricin is a toxalbumin extracted from the beans of the castor oil plant. It inhibits protein synthesis causing cell death.
. Accidental poisoning with ricin has occurred following ingestion of castor oil seeds. Although ricin is poorly absorbed following ingestion, one to three beans chewed by a child, or as few as eight seeds chewed by an adult may be fatal.
. Ricin has been considered as a potential chemical warfare agent. Although non-volatile, aerosols may be inhaled.
. Ricin is particularly toxic if injected. The fatal dose by injection is
thought to be around one microgram per kilogram body weight.
Summary of Human Toxicology
. Onset of symptoms may be delayed after absorption via any route. Fever is common. Death may be due to multi-organ failure.
. Ingestion typically causes irritation of the oropharynx and oesophagus, and gastroenteritis.
. Irritation and conjunctivitis may occur. Miosis, mydriasis and optic nerve damage have been reported.
. Bloody diarrhoea, vomiting and abdominal pain.
. Pulmonary oedema, pneumonia and ARDS.
. Seizures and CNS depression.
. Fluid loss may cause tachycardia.
. Allergic responses have been reported following exposure to castor oil beans.
. Abnormal liver function tests, including raised transaminases occur.
. Haematuria, proteinuria and elevated creatinine.
Personnel must not enter a contaminated area without full personal protective equipment including respiratory protection.
Triage
. Primary (first look) triage should be carried out using the standard triage sieve. As symptoms may be delayed few additional discriminating factors are likely to be present.
Mass Decontamination
. Patients should be removed from the source of exposure. All the patients' clothing and personal effects should be removed. Skin decontamination should be carried out using a rinse-wipe-rinse regime with dilute detergent (10ml washing up liquid to a 10 litre bucket of water).
. Contaminated clothing should be placed in clear, labelled, sealed bags to prevent further contamination
. Casualties should subsequently don clean clothing e.g. paper suits.
. If eyes are exposed, remove contact lenses and irrigate thoroughly with running water or saline for 15 minutes.
. Casualties exposed only via ingestion do not require whole body
decontamination.
Treatment
. Treatment is symptomatic and supportive. No antidote is available for the treatment of ricin poisoning.
. Allergic reactions should be treated conventionally.
Hospital Admission Criteria
. Symptomatic patients should be admitted.
. Patients who are thought to have ingested ricin should be admitted for observation.
. Patients who are thought to have ingested ricin and remain asymptomatic after eight hours may be discharged.
. Patients who are thought to have been exposed by aerosol should be admitted for observation, even if asymptomatic.
. Patients who are thought to have been exposed by aerosol and remain asymptomatic after 24 hours should be discharged.
. Accidental poisoning with ricin has occurred following ingestion of castor oil seeds. Although ricin is poorly absorbed following ingestion, one to three beans chewed by a child, or as few as eight seeds chewed by an adult may be fatal.
. Ricin has been considered as a potential chemical warfare agent. Although non-volatile, aerosols may be inhaled.
. Ricin is particularly toxic if injected. The fatal dose by injection is
thought to be around one microgram per kilogram body weight.
Summary of Human Toxicology
. Onset of symptoms may be delayed after absorption via any route. Fever is common. Death may be due to multi-organ failure.
. Ingestion typically causes irritation of the oropharynx and oesophagus, and gastroenteritis.
. Irritation and conjunctivitis may occur. Miosis, mydriasis and optic nerve damage have been reported.
. Bloody diarrhoea, vomiting and abdominal pain.
. Pulmonary oedema, pneumonia and ARDS.
. Seizures and CNS depression.
. Fluid loss may cause tachycardia.
. Allergic responses have been reported following exposure to castor oil beans.
. Abnormal liver function tests, including raised transaminases occur.
. Haematuria, proteinuria and elevated creatinine.
Personnel must not enter a contaminated area without full personal protective equipment including respiratory protection.
Triage
. Primary (first look) triage should be carried out using the standard triage sieve. As symptoms may be delayed few additional discriminating factors are likely to be present.
Mass Decontamination
. Patients should be removed from the source of exposure. All the patients' clothing and personal effects should be removed. Skin decontamination should be carried out using a rinse-wipe-rinse regime with dilute detergent (10ml washing up liquid to a 10 litre bucket of water).
. Contaminated clothing should be placed in clear, labelled, sealed bags to prevent further contamination
. Casualties should subsequently don clean clothing e.g. paper suits.
. If eyes are exposed, remove contact lenses and irrigate thoroughly with running water or saline for 15 minutes.
. Casualties exposed only via ingestion do not require whole body
decontamination.
Treatment
. Treatment is symptomatic and supportive. No antidote is available for the treatment of ricin poisoning.
. Allergic reactions should be treated conventionally.
Hospital Admission Criteria
. Symptomatic patients should be admitted.
. Patients who are thought to have ingested ricin should be admitted for observation.
. Patients who are thought to have ingested ricin and remain asymptomatic after eight hours may be discharged.
. Patients who are thought to have been exposed by aerosol should be admitted for observation, even if asymptomatic.
. Patients who are thought to have been exposed by aerosol and remain asymptomatic after 24 hours should be discharged.