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Ostermayer: Created page with "Arsine gas (AsH₃) is the most acutely toxic form of arsenic. It is a colorless, nonirritating gas that causes '''massive intravascular hemolysis''' leading to '''acute renal failure''' and death. Arsine poisoning is '''distinct from inorganic arsenic poisoning''' — it does not produce classic arsenicosis, and '''chelation therapy is not effective.'''Arsine Medical Management Guidelines. Agency for Toxic Substances and Disease Registry (ATSDR). CDC.<..."

2026-03-17T23:31:57Z

Created page with "Arsine gas (AsH₃) is the most acutely toxic form of arsenic. It is a colorless, nonirritating gas that causes '''massive intravascular hemolysis''' leading to '''acute renal failure''' and death. Arsine poisoning is '''distinct from inorganic arsenic poisoning''' — it does not produce classic arsenicosis, and '''chelation therapy is not effective.'''<ref name="ATSDR">Arsine Medical Management Guidelines. Agency for Toxic Substances and Disease Registry (ATSDR). CDC.<..."

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Arsine gas (AsH₃) is the most acutely toxic form of arsenic. It is a colorless, nonirritating gas that causes '''massive intravascular hemolysis''' leading to '''acute renal failure''' and death. Arsine poisoning is '''distinct from inorganic arsenic poisoning''' — it does not produce classic arsenicosis, and '''chelation therapy is not effective.'''<ref name="ATSDR">Arsine Medical Management Guidelines. Agency for Toxic Substances and Disease Registry (ATSDR). CDC.</ref>

==Background==
*Arsine (AsH₃) is a colorless, heavier-than-air gas with a mild '''garlic-like or fishy odor''' (odor threshold ~0.5 ppm)
*'''Warning properties are inadequate''' — toxic effects occur at or below the concentration at which odor is detectable<ref name="ATSDR"/>
*Arsine is '''extremely flammable''' and decomposes above 230°C (446°F)
*Sources of exposure:
**'''Occupational (most common):''' semiconductor/microchip manufacturing (gallium arsenide wafer production), metal smelting and refining, lead/zinc/copper ore processing, battery manufacturing, soldering, galvanizing
**Generated when arsenic-containing metals contact '''acid''' or '''water/moisture''' — may be produced unexpectedly during industrial processes<ref name="Fowler1974">Fowler BA, Weissberg JB. Arsine poisoning. ''N Engl J Med''. 1974;291(22):1171-1174. doi:10.1056/NEJM197411282912207</ref>
**Cleaning of tanks, drums, or pipes that contained arsenic-bearing materials
*'''Extremely toxic:'''<ref name="Medscape">Arsine Poisoning Clinical Presentation. ''Medscape''. 2024.</ref>
**150-250 ppm: immediately fatal
**25-50 ppm for 30 minutes: massive hemolysis, potentially fatal
**10 ppm: delirium
**3 ppm for several hours: symptomatic
**0.15 ppm: may produce mild symptoms
*Prior to the advent of hemodialysis, arsine-induced renal failure was '''100% fatal'''<ref name="Medscape"/>
*Current mortality rate approximately 25% with modern ICU care

===Mechanism of toxicity===
*Arsine is rapidly absorbed through the lungs and binds to hemoglobin in red blood cells
*Causes '''rapid, massive intravascular hemolysis''' through oxidative damage to RBC membranes<ref name="Fowler1974"/>
**Arsine depletes reduced glutathione in erythrocytes
**Generates reactive oxygen species → lipid peroxidation of RBC membranes → membrane rupture
**Persons with '''[[G6PD deficiency]]''' are more susceptible to hemolysis<ref name="R7">Region VII Disaster Health Response Ecosystem. Hazardous Materials Guideline: Arsine. 2024.</ref>
*Free hemoglobin released from hemolyzed RBCs → precipitates in renal tubules → '''acute tubular necrosis (ATN)''' and '''oliguric renal failure'''
*Arsine may also exert '''direct nephrotoxicity''' by inhibiting renal tubular cell respiration, independent of hemoglobin deposition<ref name="Haddad">Pigott DC, Liebelt EL. Arsine. In: Haddad and Winchester's Clinical Management of Poisoning and Drug Overdose. 4th ed. 2007.</ref>
*'''Arsine does NOT produce classic arsenic intoxication''' — the pathophysiology is fundamentally different<ref name="ATSDR"/>

===Healthcare worker safety===
*Small amounts of arsine may be trapped in victim's clothing/hair after massive exposure, but quantities are '''unlikely to create significant hazard''' for hospital personnel away from the scene<ref name="ATSDR"/>
*Patients exposed '''only to arsine gas''' do not require decontamination
*Use standard precautions; chemical-protective clothing generally not required for gas exposure
*SCBA required for responders at the scene

==Clinical features==
*'''Patients may appear initially well''' — symptoms may be delayed 2-24 hours after exposure<ref name="ATSDR"/>
*The classic triad is: '''garlic/fishy odor + dark red/brown urine (hemoglobinuria) + jaundice'''

===Early symptoms (30 minutes - several hours)===
*Malaise, fatigue, headache
*Nausea, vomiting, crampy abdominal pain (among the earliest signs)
*Thirst, shivering
*Dyspnea
*'''Garlic-like or fishy odor''' on breath (may not be detectable)

===Hemolytic phase (hours to 24 hours)===
*'''"Blackwater" urine''' — dark red, brown, or port wine–colored urine from '''hemoglobinuria''' (classic finding)<ref name="Medscape"/>
*'''Jaundice''' (from hemolysis; may develop within 24-48 hours)
*Rapidly progressive anemia (hemoglobin may drop below 10 g/dL)
*Tachycardia
*Pallor progressing to bronze-yellow skin discoloration (jaundice + anemia)
*Hemolysis may continue for up to '''96 hours''' after exposure<ref name="R7"/>

===Renal phase (24-72+ hours)===
*'''Oliguria/anuria''' — acute renal failure may not be evident until up to 72 hours after exposure<ref name="ATSDR"/>
*Flank pain (renal capsular distension)
*Fluid overload, pulmonary edema
*Uremia

===Cardiac===
*'''Hyperkalemia''' (from massive hemolysis + renal failure) → peaked T waves, conduction blocks, cardiac arrest<ref name="Haddad"/>
*ECG: high-peaked T waves, nonspecific ST-T changes, various degrees of heart block
*Direct myocardial toxicity may also contribute

===Neurologic (delayed, weeks to months)===
*'''Peripheral neuropathy''' — may develop 1-6 months after acute exposure (similar to inorganic arsenic)<ref name="ATSDR"/>
*Encephalopathy, cognitive changes, psychiatric disturbances

==Differential diagnosis==
===Intravascular hemolysis (other causes)===
*[[G6PD deficiency]] with oxidant exposure
*[[Copper sulfate poisoning]]
*[[Transfusion reaction]]
*[[Malaria]]
*[[Hemolytic uremic syndrome]]
*[[Thrombotic thrombocytopenic purpura]]
*[[Wilson disease]]
*Paroxysmal nocturnal hemoglobinuria

===Other toxic gas exposures===
*[[Carbon monoxide poisoning]]
*[[Cyanide poisoning]]
*[[Hydrogen sulfide poisoning]]
*[[Phosphine poisoning]] ([[Aluminum phosphide poisoning]], [[Zinc phosphide poisoning]])

===Other causes of dark/bloody urine===
*[[Rhabdomyolysis]] (myoglobinuria)
*[[Hematuria]] (other causes)

==Evaluation==
===Workup===
*'''CBC with peripheral smear:'''<ref name="Haddad"/>
**Anemia (may be severe; hemoglobin <10 g/dL)
**Reticulocytosis, leukocytosis
**Peripheral smear: RBC fragments, '''ghost cells''', anisocytosis, poikilocytosis, basophilic stippling
**Blue-green cast to WBC nuclei on unstained preparations (reported but uncommon)
*'''Hemolysis markers:'''
**Plasma free hemoglobin — elevated
**'''Haptoglobin''' — decreased or undetectable
**'''LDH''' — markedly elevated
**Indirect bilirubin — elevated
**'''Direct Coombs test — NEGATIVE''' (critical: this is Coombs-negative hemolytic anemia; distinguishes from immune-mediated hemolysis)<ref name="Haddad"/>
*'''Urinalysis:'''
**'''Hemoglobinuria''' — urine dipstick positive for blood, but no RBCs on microscopy
**Tubular casts
*'''BMP:''' renal function (BUN, creatinine), '''potassium''' (expect hyperkalemia)
*'''Hepatic function panel:''' may show elevated transaminases, bilirubin
*'''ECG:''' monitor for hyperkalemia-related changes (peaked T waves, widened QRS, heart block)
*'''Chest radiograph:''' pulmonary edema if fluid overloaded
*'''Urinary arsenic:''' may be elevated for weeks after exposure; provides index of exposure extent but does not guide acute management<ref name="ATSDR"/>
*'''Blood arsenic:''' may be elevated acutely (<2 days post-exposure); clears rapidly from blood
*'''Type and screen''' — anticipate need for transfusion or exchange transfusion
*'''Serum electrolytes, calcium''' — monitor frequently

===Diagnosis===
*Clinical: '''occupational exposure + garlic odor + dark urine + Coombs-negative hemolytic anemia + renal failure'''
*Even if arsine odor was '''not''' detected at the scene, exposure may still be significant<ref name="ATSDR"/>
*High index of suspicion in any industrial worker with unexplained hemolysis

==Management==
'''There is no specific antidote for arsine poisoning.''' Treatment is supportive care focused on protecting renal function and managing hemolysis.<ref name="ATSDR"/>

===Resuscitation===
*Airway, breathing, circulation per standard protocols
*Supplemental oxygen
*IV access; continuous cardiac monitoring

===Decontamination===
*Patients exposed '''only to arsine gas''' do '''not''' require decontamination<ref name="ATSDR"/>
*Remove contaminated clothing only if liquid arsine (compressed gas) exposure or co-exposure to arsenic-containing materials
*Irrigate eyes with water if exposed to liquid

===Renal protection (critical)===
*'''Aggressive IV fluid resuscitation''' to maintain high urine output (target 2-3 mL/kg/hr)<ref name="ATSDR"/>
*'''Urinary alkalinization:''' add 50-100 mEq NaHCO₃ to 1 L of D5W 0.25 NS; infuse to maintain urine pH >7.5 until urine is hemoglobin-free
**Rationale: alkaline urine reduces hemoglobin precipitation in renal tubules
**Note: the role of alkalinization is somewhat controversial but widely recommended<ref name="Haddad"/>
*'''Low-dose dopamine''' may help preserve renal blood flow (limited evidence)
*'''Hemodialysis''' if acute renal failure develops<ref name="ATSDR"/>
**Does '''not''' effectively remove arsine-hemoglobin or arsine-haptoglobin complexes
**Indicated for standard renal failure indications: uremia, hyperkalemia, volume overload, acidosis

===Hemolysis management===
*'''Exchange transfusion:''' considered the most effective intervention for severe hemolysis<ref name="Haddad"/>
**Removes free hemoglobin, arsine-damaged RBCs, and hemoglobin-haptoglobin complexes from circulation
**Reduces renal hemoglobin load
**Should be considered early in patients with massive hemolysis
*'''Packed RBC transfusion:''' for symptomatic anemia; adequate for mild hemolysis<ref name="Haddad"/>
*Monitor serial hemoglobin/hematocrit (hemolysis may progress for up to 96 hours)

===Hyperkalemia===
*Aggressive management per standard protocols (calcium gluconate, insulin/dextrose, sodium bicarbonate, kayexalate, hemodialysis)
*May be severe due to combined massive hemolysis + renal failure
*Continuous cardiac monitoring

===Chelation therapy===
*'''Chelation (BAL/dimercaprol) is NOT effective and NOT recommended for acute arsine poisoning'''<ref name="ATSDR"/><ref name="Haddad"/>
**BAL does '''not''' prevent or reduce hemolysis even when given soon after exposure
**Chelation addresses inorganic arsenic toxicity, not arsine's hemolytic mechanism
**Unlike [[Arsenic poisoning|inorganic arsenic poisoning]], chelation should '''not''' be used routinely

==Disposition==
*'''All symptomatic patients and all patients with significant exposure history:''' admit to ICU<ref name="Haddad"/>
**Continuous cardiac monitoring
**Hourly urine output monitoring for at least 24 hours
**Serial CBC, hemolysis markers, renal function, potassium every 4-6 hours initially
*'''Asymptomatic patients with possible exposure:''' observe for '''minimum 24 hours''' with serial labs<ref name="ATSDR"/>
**Onset of hemolysis may be delayed up to 24 hours
**Acute renal failure may not be evident for up to 72 hours
*'''Patients with no signs of hemolysis after 24 hours of observation:''' may discharge with close follow-up and return precautions<ref name="ATSDR"/>
*'''Outpatient follow-up should include:'''
**Serial renal function monitoring
**Monitoring for delayed '''peripheral neuropathy''' (may appear 1-6 months post-exposure)
**Neuropsychiatric evaluation for possible encephalopathy
*Recovery from severe arsine poisoning may take '''weeks to months'''
*Contact [[Poison control]] (1-800-222-1222 in the US) for all cases

==See Also==
*[[Arsenic poisoning]]
*[[Carbon monoxide poisoning]]
*[[Cyanide poisoning]]
*[[Hydrogen sulfide poisoning]]
*[[Aluminum phosphide poisoning]]
*[[Zinc phosphide poisoning]]
*[[Copper sulfate poisoning]]
*[[Rhabdomyolysis]]
*[[Acute kidney injury]]
*[[Hyperkalemia]]

==External Links==
*[https://wwwn.cdc.gov/TSP/MMG/MMGDetails.aspx?mmgid=1199&toxid=278 ATSDR — Arsine Medical Management Guidelines]
*[https://www.ncbi.nlm.nih.gov/books/NBK222407/ NCBI — Arsine Acute Exposure Guideline Levels]
*[https://emedicine.medscape.com/article/833740-clinical Medscape — Arsine Poisoning Clinical Presentation]
*[https://www.nejm.org/doi/full/10.1056/NEJM197411282912207 NEJM — Arsine Poisoning (Fowler & Weissberg, 1974)]

==References==
<references/>

[[Category:Toxicology]]

Arsine gas exposure - Revision history

Danbot: Strip excess bold

Danbot: Moved intro into Background as bullets; removed excessive bold from bullet lead-ins; added Toxic gas exposure DDX and Hemolytic anemia DDX templates