vesicants - hsdl
TRANSCRIPT
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USAMRICDPROTECT, PROJECT, SUSTAIN
MEDICAL MANAGEMENT OF CHEMICAL CASUALTIES
U.S. ARMY MEDICAL RESEARCH INSTITUTE OF CHEMICAL DEFENSE
VESICANTS
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 2
OBJECTIVES• Know the mechanism of action (pathophysiology)
• Identify signs and symptoms for all routes of exposure and the clinical time course
• Know specific pre and post exposure treatment regimens
• Understand the specific pharmacology of each treatment regimen
• Understand the prognosis and triage for mild, moderate, and severe exposure
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 3
MILITARY VESICANTS
• Mustards
–Sulfur (agent)
–Nitrogen (chemotherapy)
• Lewisite
• Phosgene oxime
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 4
MUSTARD HISTORY
• 1822: First synthesized (Despretz)
• Mid-1800s: Synthesized again (Niemann, Guthrie)
• 1880s: Manufacturing process (Meyer)
• 1917: First battlefield use (Germany)
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 5
WORLD WAR I CW CASUALTIES
CW Casualties %Fatal
Germany 200,000 4.5
France 190,000 4.2
Britain 189,000 4.2
U.S. 73,000 2.0
Russia 475,000 11.8
Kurds 5,000 100?
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VESICANTS
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VESICANTS 6
WW I USE
• Caused more than 70% of chemical casualties
• Lethality low; under 5%
• Long convalescence
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VESICANTS
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VESICANTS 7
WORLD WAR II
• The Bari mustard disaster• 02 December 1943
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 8
POST-WORLD WAR I
• Italy against Ethiopia
• Japan against China
• Iraq against Iran, Kurds
• Alleged: Egypt against Yemen
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 9
MUSTARD
• HS: Hun Stoff
• H: Impure
• HD: Distilled, pure
• HL: Mustard/Lewisite
• HT: Mustard/agent T
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VESICANTS
USAMRICDPROJECT, PROTECT, SUSTAIN
VESICANTS 10
SULFUR MUSTARD
CH2 - CH2 - ClMustard S
CH2 - CH2 - Cl
CH2 - CH2 - OHThiodiglycol S
CH2 - CH2 - OH
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VESICANTS
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VESICANTS 11
MUSTARD
• Oily liquid
• Light yellow to brown
• Vapor heavier than air
• Liquid heavier than water
• Low volatility; persistent
• Freezes/melts at 58°F
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VESICANTS
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VESICANTS 12
MUSTARD DETECTION
• Liquid: M8, M9 papers
• Vapor: M256A1; CAM
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VESICANTS
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VESICANTS 13
MUSTARD PENETRATION
• Through skin surfaces in 2 minutes
• 80% on skin evaporates
• Part is “fixed” in skin, rest circulates
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VESICANTS 14
MUSTARD
• Quickly cyclizes in tissue
• Alkylates cell components (DNA, proteins)
• DNA damage leads to:– cell death– mutation
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VESICANTS
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VESICANTS 15
MUSTARD TOXICITY
Vapor unprotected (mg•min/m3)
Eye 10 to 50
Airways 100 to 500
Skin 200 to 1,000
Death 1,500
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VESICANTS
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VESICANTS 16
LiquidBlister 10ugDeath 100 mg/kg
7 gm/70 kg
MUSTARD TOXICITY
CONTINUEDCONTINUED
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VESICANTS
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VESICANTS 17
MUSTARD: DAMAGES
• Skin• Eyes• Airways• Systemic:
– Bone marrow– GI tract– CNS– Lymphoid tissue
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VESICANTS
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VESICANTS 18
MUSTARD CASUALTIES FROM WWI
• Eyes………………………...85%• Respiratory Tract…...75%• Scrotum ……………….....42%• Face ……………….………..27%• Anus ……………………….24%• Legs………………...……….11%• Buttocks ……………….....10%• Hands ……………...………..4%• Feet………………...………1.5%
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VESICANTS
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VESICANTS 19
MUSTARD: ONSET
• Cellular interaction: 1 to 2 minutes
• Clinical effects: 2 to 48 hoursUsually 4 to 8 hours
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VESICANTS
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VESICANTS 20
MUSTARD: SKIN
• Erythema
• Small vesicles; later coalesce
• Blisters/bulla
• Possible coagulation necrosis with liquid exposure
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VESICANTS
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VESICANTS 21
MUSTARD: ONSET
• Chemical cell damage: 1 to 2 minutes
• Clinical effects: 2 to 48 hours
• Usually 4 to 8 hours
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VESICANTS
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VESICANTS 22
MUSTARD: EYE
• Mild: conjunctivitis, blepharospasm
• Moderate: lid inflammation and edema, blepharospasm, corneal roughening
• Severe: Corneal opacification, ulceration, and/or perforation
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MUSTARD: EYE
• 75% only mild conjunctivitis
– Return to duty in 2 weeks
• 15% moderate conjunctivitis
– Return to duty 4-6 weeks
• 10% severe; under 1% with residual damage
• 0.1% “legal” blindness
CONTINUEDCONTINUED
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VESICANTS 24
MUSTARD: ACUTE EFFECTS
• Upper airway
– Hemorrhage
– Pain
• Larynx
– Hoarseness
– Stridor
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VESICANTS 25
MUSTARD: ACUTE EFFECTS
• Trachea/bronchi– bronchospasm
– pseudomembranes
• Small airway and alveoli (massive exposure)– hemorrhagic edema
CONTINUEDCONTINUED
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MUSTARD: DEATH
• Usually pulmonary:
–Damaged airways
– Infection
–Depressed immune system
–Sepsis
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MUSTARD: MARROW
• Damaged stem cells
• Decreased WBC, RBC, platelets(Day 7 to day 14)
• Survival rare if WBC <200(Iran / Iraq)
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MUSTARD: GI
• Early (< 24 hours):
– transient symptoms
– cholinergic effect
• Late (>3 days):
– severe damage
– cytotoxic effect
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VESICANTS
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SEVERE MUSTARD EXPOSURE
• CNS– Apathy, lethargy
– Euphoria
– Convulsions, only with massive exposure!
– Coma
– Death
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MUSTARD
• Radiomimetic (DNA)
– epithelial cells
(eye, pulmonary, skin, GI)
– hematopoetic
– damages many tissues
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MUSTARD: SYMPTOMS
• Symptoms within 4 hours = severe injury
• Airway symptoms within 6 hours is often fatal
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DIFFERENTIAL DIAGNOSIS
• Isolated cases: plant, animal, other chemicals
• Many cases:
– Latent effects: Mustard
– Immediate effects: Lewisite, Phosgene Oxime
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MUSTARD: DIAGNOSTICS
• Non-specific
• CBC
• Early chemical pneumonitis: fever, WBC, chest x-ray
• Pneumonia: sputum exam / culture
• Urinary thiodiglycol: DA TB Med 296
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MUSTARD: MANAGEMENT
Protect Self!!!
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DECONTAMINATION
• Early decon protects casualty
– within minutes
• Late decon protects medical personnel and facility
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VESICANTS 36
MANAGEMENT: SKIN
• Soothing cream/lotion
• Unroof large blisters
• Debridement of burns
• Frequent irrigation
• Antibiotics: Topical / Systemic (cellulitis)
• Systemic analgesics
• Appropriate IV fluids and electrolytes
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VESICANTS 37
MANAGEMENT: EYES
• Soothing eye drops
• Topical mydriatics
• Topical antibiotics
• Vaseline on lid edges
• Avoid topical analgesics
• Topical steroids - ??
• Sunglasses
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VESICANTS
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VESICANTS 38
MANAGEMENT: AIRWAYS
• Steam, cough suppressants
• Oxygen
• Bronchodilators, steroids
• Early intubation
• Assisted ventilation
• Antibiotics AFTER organism identified
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VESICANTS 39
MANAGEMENT: GI
• Atropine
• Antiemetics
• Fluid therapy
• Electrolyte replacement
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VESICANTS 40
MANAGEMENT: MARROW
• Blood component replacement
– RBC, WBC, Platelets
• Marrow transplants
• Hormonal therapy
• Reverse isolation
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MUSTARD: LONG TERM
• Carcinogen / mutagen
• No evidence of human reproductive toxicity
• Chronic exposure
– Respiratory cancer
– Unclear: chronic bronchitis, emphysema
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MUSTARD: LONG TERM
• No evidence of cancer after one or two exposures
• Chronic eye problems / damage may follow severe eye exposure
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LEWISITE
• World War I origin; not used
• Possible use by Japan vs China
• No other known use
• Sparse data
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LEWISITE
• Oily, amber to brown liquid
• Freezing point ~ 0°F
• Heavier than air, water
• Persistent
• Geranium odor
CONTINUEDCONTINUED
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LEWISITE: TOXICITY
Vapor– Eyes Effects 2 mg-min/m3
– Vesication 1,500 mg-min/m3
– Death 1,500 mg-min/m3
Liquid– Blister 14 µµg
– Death 2.8 g
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LEWISITE: MECHANISM
• Contains arsenic – carcinogen ??
• Reacts with many constituents: cellular necrosis
• Mechanism unknown
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VESICANTS 47
LEWISITE: DAMAGES
• Eyes
• Skin
• Airways
• Capillaries
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LEWISITE: TIME OF ONSET
• Pain, irritation within 1 min
• Tissue necrosis within 5 min
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LEWISITE: SKIN
• Progresses to blister
• More necrosis than from mustard
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LEWISITE: EYES
• Pain, blepharospasm on contact
• Rapid edema of conjunctiva, lids– Eyes swollen shut in an hour
• Damage to iris and cornea
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LEWISITE: AIRWAYS
• Severe irritation
• Bronchial epithelial necrosis, similar to mustard
• More prone to pseudomembranes, pulmonary edema than mustard
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LEWISITE SHOCK
• Increased capillary permeability– Plasma volume decreased
– Hemoconcentration
– Hypotension
– Pulmonary edema
– Circulatory failure
– Death
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LEWISITE: MANAGEMENT
• Immediate decontamination
• Treat as mustard lesion
• British Anti-lewisite (BAL)Dimercaprol– Systemic
– Topical
– Ophthalmic
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LEWISITE: TREATMENT
• Hospital care - severe exposure
– IM injection of BAL (10% in oil)
– Initial dose: 0.5cc per 25 lbs
(up to 4cc total)
– May be given at 4, 8, 12 hours after initial dose
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BAL SIDE EFFECTS
• Lacrimation
• Constriction of throat
• GI cramps, vomiting, nausea
• Anxiety, myalgias
• Hypertension
• May last up to 30 minutes
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PHOSGENE OXIME (CX)
• Rapid onset
• Toxic, irritating, corrosive
• Urticant, not vesicant
• Sparse data
• Never used in combat
• Stockpiled by USSR
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PHOSGENE OXIME (CX)
• Phosgene oxime corrosive to all tissues (skin, lungs, eyes)– Pulmonary edema
• Phosgene oxime manufactured from Phosgene
• Phosgene (CG) - lung agent only
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PHOSGENE OXIME: MANAGEMENT
• Management:
– Symptomatic
– Supportive
– Same as mustard
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USAMRICDPROTECT, PROJECT, SUSTAIN
MEDICAL MANAGEMENT OF CHEMICAL CASUALTIES
U.S. ARMY MEDICAL RESEARCH INSTITUTE OF CHEMICAL DEFENSE
SUMMARY
ANY QUESTIONS?