What Agent Caused More Chemical Casualties in World War I Than All Other Chemical Agents Combined?
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Transcript of What Agent Caused More Chemical Casualties in World War I Than All Other Chemical Agents Combined?
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What Agent Caused More What Agent Caused More Chemical Casualties in World Chemical Casualties in World War I Than All Other Chemical War I Than All Other Chemical
Agents Combined?Agents Combined?
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What chemical agent caused What chemical agent caused over 5000 known casualties as over 5000 known casualties as recently as the 1980's and was recently as the 1980's and was
also used on civilian also used on civilian populations including populations including
children?children?
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What chemical agent is in the What chemical agent is in the arsenals of at least a dozen arsenals of at least a dozen
countries around the globe and countries around the globe and ready to use against a ready to use against a
perceived enemy?perceived enemy?
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MUSTARDMUSTARD
Clifton E. Yu, MD
LTC, MC
Department of Pediatrics
4 4 4Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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VesicantsVesicants
Agent that causes vesicles or blisters Main vesicant in production today: sulfur
mustard Lewisite and Phosgene Oxime (CX) also
classified as vesicants--lesser availability and history of use
5 5 5Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Mustard--Why So Mustard--Why So Important?Important?
No antidote Causes lots of morbidity Relatively easy to synthesize Delayed symptoms Children more susceptible to its toxic
effects
6 6 6Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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HistoryHistory 1000 B.C.--arsenic smokes used by Chinese
against invading Mongol tribes 423 B.C.--Spartans used burning sulfur and
coal smoke to attack Athenians in Peloponnesian War
1854--sulfur mustard first synthesized 1917--chlorine, phosgene, and particularly
mustard used by both British and Germans resulting in thousands of casualties
7 7 7Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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8 8 8Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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History (cont.)History (cont.) 1934--nitrogen mustard synthesized 1935--used by Italy against Abyssinia 1937--Japan allegedly uses mustard gas
against China during invasion of Manchuria 1960's--used by Egypt against Yemen 1980's--extensive use of mustard gas against
Iranian soldiers and civilians during Iran-Iraq War
9 9 9Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Characteristics of Chemical Characteristics of Chemical AgentsAgents
Volatility--degree to which a substance vaporizes
Persistence--refers specifically to how long the substance stays in the environment and is inversely related to volatility
10 10 10Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Characteristics of MustardCharacteristics of Mustard
Oily, yellow to dark brown liquid Garlic or mustard odor Considered a persistent agent Is "radiomimetic" Thought to work as an alkylating agent
11 11 11Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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12 12Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
DetectionDetection
Smell M8, M9 paper, various detectors Clinical recognition
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Clinical EffectsClinical Effects
Skin, Eyes, Respiratory Tract
Bone Marrow, GI, CNS in Severe Exposures
13 13 13Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Skin EffectsSkin Effects
Latent period of several hours after exposure
Erythema, then blister formation With high dose, skin sloughing Blister fluid not hazardous
14 14 14Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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15 15 15Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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16 16 16Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Ocular EffectsOcular Effects
Most often caused by vapor Conjunctival inflammation Corneal damage Severe lid edema Rarely permanent blindness
17 17 17Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Respiratory EffectsRespiratory Effects
Vapor induced Upper respiratory tract irritation Dyspnea and productive cough Severe necrotizing tracheobronchitis with
pseudomembrane formation Secondary bacterial infection
18 18 18Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Bone MarrowBone Marrow
Involvement occurs in severe cases
Usually occurs on day 3 to 5
ANC less than 500 or a precipitous drop portends a high risk of sepsis and death
19 19 19Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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GI TractGI Tract
Usually manifested by nausea and vomiting Generally transient and not severe Thought to be caused by cholinergic activity
of mustard Delayed nausea and vomiting thought
secondary to generalized cytotoxic activity and mucosal damage to GI tract
20 20 20Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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CNSCNS
Symptoms not usually prominent Common complaints in World War I were
apathy, depression, and intellectual dullness 83% of hospitalized Iranians in one study
had CNS complaints--usually mild and non-specific
21 21 21Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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TreatmentTreatment Decon, Decon, Decon !!!
-only effective means of preventing or decreasing tissue damage
-must be performed before entry into a clean MTF
Remainder of treatment depends on the other organ systems involved
22 22 22Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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SkinSkin
Treat like a burn Erythema treated with soothing lotion, e.g.
calamine Carefully unroof larger blisters Irrigation of denuded areas 3-4X daily
23 23 23Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Skin (cont.)Skin (cont.)
Topical antibiotics, e.g. Silvedene Systemic antipruritics Systemic analgesics Fluids and electrolytes
24 24 24Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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EyesEyes
Thorough irrigation Cycloplegics (e.g. homatropine) Topical antibiotics Vaseline to edges of eyelids Systemic analgesics (e.g. NSAID's)
25 25 25Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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PulmonaryPulmonary
Upper airway symptoms--steam inhalation, cough suppressants
Avoid using antibiotics early on Intubation if lower resp. sx's progress -attempt before laryngospasm or significant edema develop -direct laryngoscopy with suctioning if evidence of pseudomembrane formation
26 26 26Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Pulmonary (cont.)Pulmonary (cont.)
No evidence steroids beneficial routinely
Prolonged assisted or controlled ventilation--bad prognosis
27 27 27Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Bone MarrowBone Marrow
If neutropenic, some advocate gut sterilization with non-absorbable antibiotics
Bone marrow transplant or transfusion--may be life-saving in selected cases
28 28 28Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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GIGI
Atropine (0.4 to 0.6 mg IM or IV for adults) or another anti-cholinergic may be helpful
IV fluids
29 29 29Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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SummarySummary
Decontamination Treat like a burn patient Liberal use of analgesics Fluids and electrolytes (less than for
standard burns) System specific treatment as necessary
30 30 30Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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But What About Children?But What About Children? Very little in literature Recent experience with childhood mustard
exposure from Iran-Iraq War (Momeni and Aminjarahari, Int. J. Derm. Vol 33, March 1994)
Earlier onset of skin lesions, more severe More frequent and severe opthalmic,
pulmonary, and GI involvement
31 31 31Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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SkinSkin
Earlier lesions, more bullae First index case may therefore be a child Traditional decontamination with sodium
hypochlorite (bleach) may be harmful to child's skin
Use copious amounts of soap and water instead
32 32 32Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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EyesEyes
More frequent and severe eye findings
Same therapeutic interventions
33 33 33Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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PulmonaryPulmonary
Higher incidence of lung involvement
Increased minute ventilation in children
May have to intubate sooner
34 34 34Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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GIGI
Increased involvement probably dose related
Children more likely to have protracted emesis
Atropine or other anti-cholinergic in age-appropriate doses may be helpful
35 35 35Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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Pediatric Exposure--SummaryPediatric Exposure--Summary
Earlier and more severe skin lesions (soap and water for decontamination)
Pay early attention to eyes in virtually all children Be on lookout for earlier and more severe lung
involvement May have to treat GI symptoms more aggressively
(and watch for increase in dehydration)
36 36 36Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center
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BE PREPARED!!!BE PREPARED!!!…and get ready for inhalants next week
37 37 37Clifton Yu, MDClifton Yu, MDDepartment of PediatricsDepartment of Pediatrics
Walter Reed Army Medical CenterWalter Reed Army Medical Center