Copper sulfate toxicity - Revision history

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 *Prognosis is poorer with delayed presentation, large ingested volume, renal failure, and markedly elevated transaminases (AST >234 U/L)<ref name="Consultant"/>
 *Contact [[Poison control]] for all cases
 ==See Also==

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Ostermayer: Created page with "Copper sulfate (CuSO₄) toxicity is a rare but potentially lethal poisoning caused by ingestion of copper sulfate, a powerful oxidizing agent that causes corrosive gastrointestinal injury and multiorgan failure through intravascular hemolysis, methemoglobinemia, hepatotoxicity, and acute kidney injury.Gamakaranage CS, Rodrigo C, Weerasinghe S, et al. Complications and management of acute copper sulphate poisoning; a case discussion. ''J Occu..."

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Created page with "Copper sulfate (CuSO₄) toxicity is a rare but potentially lethal poisoning caused by ingestion of copper sulfate, a powerful oxidizing agent that causes corrosive gastrointestinal injury and multiorgan failure through intravascular hemolysis, methemoglobinemia, hepatotoxicity, and acute kidney injury.<ref name="Gamakaranage2011">Gamakaranage CS, Rodrigo C, Weerasinghe S, et al. Complications and management of acute copper sulphate poisoning; a case discussion. ''J Occu..."

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Copper sulfate (CuSO₄) toxicity is a rare but potentially lethal poisoning caused by ingestion of copper sulfate, a powerful oxidizing agent that causes corrosive gastrointestinal injury and multiorgan failure through intravascular hemolysis, methemoglobinemia, hepatotoxicity, and acute kidney injury.<ref name="Gamakaranage2011">Gamakaranage CS, Rodrigo C, Weerasinghe S, et al. Complications and management of acute copper sulphate poisoning; a case discussion. ''J Occup Med Toxicol''. 2011;6:34. doi:10.1186/1745-6673-6-34</ref>

==Background==
*Copper sulfate pentahydrate (CuSO₄·5H₂O) is a bright blue crystal commonly known as '''"blue vitriol"''' or '''"blue stone"'''
*Used as a pesticide, fungicide, algaecide (pool/pond treatment), leather tanning agent, and in photography and glue manufacturing<ref name="Saravu2007">Saravu K, Jose J, Bhat MN, Jimmy B, Shastry BA. Acute ingestion of copper sulphate: a review on its clinical manifestations and management. ''Indian J Crit Care Med''. 2007;11(2):74-80.</ref>
*Also burned in Hindu and Buddhist religious ceremonies as a "good luck charm"
*The attractive blue color makes it a risk for accidental pediatric ingestion
*Most cases of intentional ingestion are reported from the Indian subcontinent, though cases occur worldwide<ref name="Naha2012">Naha K, Saravu K, Shastry BA. Blue vitriol poisoning: a 10-year experience in a tertiary care hospital. ''Clin Toxicol''. 2012;50(3):197-201.</ref>
*In adults, ingestion is most commonly intentional (self-harm)
*'''Toxic dose:''' symptoms manifest with ingestion of >1 g in adults<ref name="Gamakaranage2011"/>
*'''Lethal dose:''' 10-20 g, though individual variation exists<ref name="Gamakaranage2011"/>
*'''Mortality rate:''' 14-36% in severe poisoning if not treated promptly<ref name="StatPearls">Copper Toxicity. ''StatPearls''. 2023. PMID: 32491602</ref>
*Early deaths result from hypovolemic shock; late deaths from hepatic failure, renal failure, or sepsis

===Mechanism of toxicity===
*Copper is a powerful oxidizing agent
*'''Local effect:''' direct corrosive injury to GI mucosa
*'''Systemic effects''' (following absorption):
**Oxidizes hemoglobin Fe²⁺ to Fe³⁺ → '''[[Methemoglobinemia|methemoglobinemia]]'''
**Oxidative damage to red blood cell membranes → '''intravascular hemolysis'''
**Majority of absorbed copper deposited in the liver via portal circulation → '''hepatocellular necrosis'''
**Free hemoglobin and direct copper nephrotoxicity → '''[[Acute kidney injury|acute tubular necrosis]]'''
**Direct toxic injury to skeletal muscle → '''[[Rhabdomyolysis|rhabdomyolysis]]'''

==Clinical features==
*Characteristic '''blue-green vomitus''' and '''metallic taste''' are classic early findings<ref name="Saravu2007"/>
*Presentation evolves over hours to days in a predictable organ-system pattern

===Early (hours)===
*Nausea, vomiting (may be blue/green colored), diarrhea (may be bloody)
*Burning epigastric and abdominal pain
*Hematemesis, melena (from erosive gastropathy)
*Metallic taste
*Excessive salivation

===Intermediate (12-24 hours)===
*'''"Saturation gap":''' pulse oximetry SpO₂ reads low (e.g. 85%) while ABG PaO₂ and calculated SaO₂ are normal — classic clue for [[Methemoglobinemia|methemoglobinemia]]<ref name="Gamakaranage2011"/>
*Chocolate-brown cyanosis that does not improve with supplemental oxygen
*Jaundice (from hemolysis and hepatic injury)
*Cola-colored or dark urine (hemoglobinuria)
*Oliguria/anuria
*Tachycardia, hypotension

===Late (24-72+ hours)===
*Hepatic failure (elevated AST, ALT, bilirubin; coagulopathy)
*[[Acute kidney injury]] (from hemoglobinuria, rhabdomyolysis, direct nephrotoxicity)
*[[Rhabdomyolysis]] (elevated CK)
*Encephalopathy, altered mental status, seizures, coma
*Cardiac dysrhythmias
*[[Acute pancreatitis]] (reported complication)<ref name="Gamakaranage2011"/>
*[[DIC|Disseminated intravascular coagulation]]
*Adrenal insufficiency (copper deposits in adrenals; rare)<ref name="Sinkovic2008">Sinkovic A, Strdin A, Svensek F. Severe acute copper sulphate poisoning: a case report. ''Arh Hig Rada Toksikol''. 2008;59(1):31-35. doi:10.2478/10004-1254-59-2008-1847</ref>
*Multiorgan failure, death

==Differential diagnosis==
===[[Methemoglobinemia]] (other causes)===
*[[Dapsone]] toxicity
*Nitrite/nitrate exposure
*Aniline dye exposure
*[[Benzocaine]] toxicity
*Amyl nitrite (poppers)

===Intravascular hemolysis (other causes)===
*[[G6PD deficiency]] with oxidant exposure
*[[Wilson disease]]
*[[Arsine gas exposure]]
*[[Transfusion reaction]]

===Other poisonings with similar multiorgan presentation===
*[[Iron toxicity]]
*[[Arsenic poisoning]]
*[[Mercury poisoning]]
*[[Zinc phosphide poisoning]]
*[[Mushroom poisoning]] (''Amanita'' species)

==Evaluation==
===Workup===
*'''CBC with peripheral smear''' — anemia, schistocytes, spherocytes (evidence of intravascular hemolysis)
*'''BMP, hepatic function panel''' — renal function, LFTs (AST, ALT often markedly elevated)
*'''Coagulation studies''' (PT/INR, fibrinogen) — for DIC screening
*'''LDH, haptoglobin, reticulocyte count, indirect bilirubin''' — hemolysis markers
*'''Methemoglobin level''' (co-oximetry on ABG) — essential; suspect when SpO₂ on pulse oximetry is discrepant from ABG-calculated saturation
*'''CK and myoglobin''' — for rhabdomyolysis
*'''Serum amylase/lipase''' — pancreatitis has been reported<ref name="Gamakaranage2011"/>
*'''Urinalysis''' — hemoglobinuria (dark/cola-colored urine, positive dipstick for blood without RBCs on microscopy), myoglobinuria
*'''Serum copper levels:'''
**Whole blood copper correlates better with severity than serum copper<ref name="Chuttani1965">Chuttani HK, Gupta PS, Gulati S, Gupta DN. Acute copper sulfate poisoning. ''Am J Med''. 1965;39(5):849-854.</ref>
**Serum copper and ceruloplasmin do '''not''' reliably correlate with clinical severity or prognosis<ref name="Consultant">Acute Copper Sulfate Poisoning. ''Consultant360''. 2016.</ref>
**Useful if etiology unknown; not essential if history is clear
*'''Type and screen''' — anticipate need for transfusion
*'''ECG''' — monitor for dysrhythmias
*'''ABG''' — metabolic acidosis, methemoglobin level
*'''Salicylate, acetaminophen, ethanol levels''' if intentional ingestion suspected
*'''Peak AST >234 U/L and ALT >55 U/L''' have been linked with higher mortality<ref name="Consultant"/>

===Diagnosis===
*Primarily clinical: history of ingestion of blue crystals/solution + blue-green vomitus + erosive GI symptoms
*'''Saturation gap''' (pulse oximetry SpO₂ << ABG SaO₂) is a key diagnostic clue for methemoglobinemia
*Blue discoloration of vomitus, stool, or gastric contents is highly suggestive
*Confirmed by elevated whole blood or serum copper levels, though treatment should not await results

==Management==
===Initial resuscitation===
*Airway, breathing, circulation; continuous cardiac monitoring
*Large-bore IV access; aggressive IV fluid resuscitation
*Correct hypovolemic shock from GI losses and third-spacing

===Reduction of absorption===
*'''Gastric lavage''' — may be considered if presenting early (within 1-2 hours), though vomiting typically occurs spontaneously; copper sulfate itself is a potent emetic<ref name="Saravu2007"/>
*'''Activated charcoal''' — limited data; may have some benefit if given early, but efficacy for copper is uncertain<ref name="FatalCase">Bhat P, et al. A fatal and deceiving case of copper sulphate poisoning. ''J Anaesthesiol Clin Pharmacol''. 2018;34(3):417-419. doi:10.4103/joacp.JOACP_8_17</ref>
*'''Dilution with milk or water''' — may reduce absorption if given very early
*'''Do NOT induce emesis''' — re-exposure to corrosive agent risks further mucosal injury

===Chelation therapy===
*'''D-Penicillamine''' — most commonly used chelator<ref name="Gamakaranage2011"/><ref name="StatPearls"/>
**Dose: 1-1.5 g/day in 2-4 divided doses (oral)
**Promotes urinary copper excretion
**Efficacy in acute poisoning is unproven but widely recommended for severe cases
**Nephrotoxic; use with caution or avoid if AKI develops without dialysis support
**Contraindicated if severe corrosive GI injury prevents oral intake
*'''Dimercaprol (BAL)''' — IM alternative when oral penicillamine is not tolerated or contraindicated<ref name="Gamakaranage2011"/>
**Dose: 3-5 mg/kg/dose IM q4h for first 2 days, then taper over 7-11 days
**Less effective than penicillamine
*'''DMPS (2,3-dimercapto-1-propanesulfonate)''' — alternative chelator, reported effective in severe cases<ref name="Sinkovic2008"/>
*'''Edetate calcium disodium (CaNa₂EDTA)''' — another option; some recommend as first-line when penicillamine is unsafe; carries risk of acute tubular necrosis<ref name="Gamakaranage2011"/>
*'''Trientine''' — second-line chelator (used primarily in [[Wilson disease]])<ref name="StatPearls"/>
*Duration of chelation is not established by evidence; generally continued until clinical improvement and copper levels normalize

===Methemoglobinemia===
*'''[[Methylene blue]]''' 1-2 mg/kg IV over 5 minutes<ref name="Gamakaranage2011"/>
**May repeat once after 1 hour if cyanosis persists
**Requires intact RBCs and adequate NADPH to function — '''may be ineffective if severe hemolysis is present'''<ref name="FatalCase"/>
**'''Contraindicated in [[G6PD deficiency]]''' (will worsen hemolysis)
*If methylene blue fails:
**'''Exchange transfusion''' — replaces hemolyzed RBCs and removes copper-laden cells; case reports of successful use<ref name="SaudiKidney">Copper Sulphate Poisoning and Exchange Transfusion. ''Saudi J Kidney Dis Transpl''. 2011;22(6):1227-1230.</ref>
**'''Hyperbaric oxygen''' — alternative for refractory methemoglobinemia
**'''Ascorbic acid''' — weaker reducing agent; adjunct only

===Hemolysis and anemia===
*Transfuse packed red blood cells as needed
*Monitor hemoglobin frequently (may drop rapidly)
*Maintain high urine output (target >1 mL/kg/hr) to prevent hemoglobin cast nephropathy

===Acute kidney injury===
*Aggressive IV fluid resuscitation to maintain urine output
*'''Hemodialysis''' is ineffective at removing copper (protein-bound) but '''essential for supportive management of AKI''' and its complications (hyperkalemia, uremia, volume overload)<ref name="Gamakaranage2011"/>
**Chelated copper complexes may be removed by dialysis
**Peritoneal dialysis is inferior to hemodialysis for this purpose
*'''Plasmapheresis/exchange transfusion''' — case reports suggest benefit in removing circulating copper and hemolyzed cells<ref name="Blues">Alain M, et al. She Has The Blues: An Unusual Case of Copper Sulphate Intoxication. ''Cureus''. 2020;12(2):e7045. doi:10.7759/cureus.7045</ref>

===Hepatic injury===
*Supportive care; monitor LFTs and coagulation parameters serially
*Correct coagulopathy with vitamin K, FFP as needed
*Liver transplant may be required in fulminant hepatic failure (rare)

===GI injury===
*NPO if severe erosive gastropathy
*PPI (IV omeprazole/pantoprazole infusion)
*Sucralfate for mucosal protection
*Transfuse for significant GI hemorrhage

==Disposition==
*'''All patients with confirmed or suspected significant copper sulfate ingestion (>1 g) should be admitted'''
*'''Severe poisoning:''' ICU admission with continuous monitoring
**Monitor serial CBC, renal function, LFTs, LDH, CK, methemoglobin, coagulation studies at minimum q6-12 hours for the first 48-72 hours
*'''Mild/accidental ingestion with minimal symptoms:'''
**Observe for at least 24 hours for delayed hemolysis, hepatic and renal injury
**Check serial labs before considering discharge
*'''All intentional ingestions:''' psychiatric evaluation mandatory prior to discharge
*'''Complications may evolve over 3-5 days''' — patients may appear stable initially before rapid deterioration from hemolysis, AKI, or hepatic failure<ref name="FatalCase"/>
*Prognosis is poorer with delayed presentation, large ingested volume, renal failure, and markedly elevated transaminases (AST >234 U/L)<ref name="Consultant"/>
*Contact [[Poison control]] for all cases

==See Also==
*[[Methemoglobinemia]]
*[[Caustic ingestion]]
*[[Acid ingestion]]
*[[Iron toxicity]]
*[[Wilson disease]]
*[[Rhabdomyolysis]]
*[[Acute kidney injury]]
*[[Intravascular hemolysis]]

==External Links==
*[https://www.ncbi.nlm.nih.gov/books/NBK557456/ StatPearls — Copper Toxicity]
*[https://pmc.ncbi.nlm.nih.gov/articles/PMC3269987/ J Occup Med Toxicol — Complications and management of acute copper sulphate poisoning (2011)]
*[https://pmc.ncbi.nlm.nih.gov/articles/PMC6190426/ J Anaesthesiol Clin Pharmacol — A fatal and deceiving case of copper sulphate poisoning (2018)]
*[https://pmc.ncbi.nlm.nih.gov/articles/PMC10208537/ J Clin Diagn Res — Intravascular Hemolysis, Methemoglobinemia and Acute Renal Failure (2023)]
*[https://www.inchem.org/documents/ukpids/ukpids/ukpid56.htm UK PID Monograph — Copper Sulfate]

==References==
<references/>

[[Category:Toxicology]]
[[Category:GI]]

← Older revision		Revision as of 09:29, 22 March 2026
Line 1:		Line 1:
	==Background==		==Background==
	*Copper sulfate (CuSO₄) toxicity is a rare but potentially lethal poisoning caused by ingestion of copper sulfate, a powerful oxidizing agent that causes corrosive gastrointestinal injury and multiorgan failure through intravascular hemolysis, methemoglobinemia, hepatotoxicity, and acute kidney injury.<ref name="Gamakaranage2011">Gamakaranage CS, Rodrigo C, Weerasinghe S, et al. Complications and management of acute copper sulphate poisoning; a case discussion. ''J Occup Med Toxicol''. 2011;6:34. doi:10.1186/1745-6673-6-34</ref>		*Copper sulfate (CuSO₄) toxicity is a rare but potentially lethal poisoning caused by ingestion of copper sulfate, a powerful oxidizing agent that causes corrosive gastrointestinal injury and multiorgan failure through intravascular hemolysis, methemoglobinemia, hepatotoxicity, and acute kidney injury.<ref name="Gamakaranage2011">Gamakaranage CS, Rodrigo C, Weerasinghe S, et al. Complications and management of acute copper sulphate poisoning; a case discussion. ''J Occup Med Toxicol''. 2011;6:34. doi:10.1186/1745-6673-6-34</ref>
	*Copper sulfate pentahydrate (CuSO₄·5H₂O) is a bright blue crystal commonly known as ~~'''~~"blue vitriol"~~'''~~ or ~~'''~~"blue stone"~~'''~~		*Copper sulfate pentahydrate (CuSO₄·5H₂O) is a bright blue crystal commonly known as "blue vitriol" or "blue stone"
	*Used as a pesticide, fungicide, algaecide (pool/pond treatment), leather tanning agent, and in photography and glue manufacturing<ref name="Saravu2007">Saravu K, Jose J, Bhat MN, Jimmy B, Shastry BA. Acute ingestion of copper sulphate: a review on its clinical manifestations and management. ''Indian J Crit Care Med''. 2007;11(2):74-80.</ref>		*Used as a pesticide, fungicide, algaecide (pool/pond treatment), leather tanning agent, and in photography and glue manufacturing<ref name="Saravu2007">Saravu K, Jose J, Bhat MN, Jimmy B, Shastry BA. Acute ingestion of copper sulphate: a review on its clinical manifestations and management. ''Indian J Crit Care Med''. 2007;11(2):74-80.</ref>
	*Also burned in Hindu and Buddhist religious ceremonies as a "good luck charm"		*Also burned in Hindu and Buddhist religious ceremonies as a "good luck charm"
Line 16:		Line 16:
	* Local effect: direct corrosive injury to GI mucosa		* Local effect: direct corrosive injury to GI mucosa
	* Systemic effects (following absorption):		* Systemic effects (following absorption):
	**Oxidizes hemoglobin Fe²⁺ to Fe³⁺ → ~~'''~~[[Methemoglobinemia\|methemoglobinemia]]~~'''~~		**Oxidizes hemoglobin Fe²⁺ to Fe³⁺ → [[Methemoglobinemia\|methemoglobinemia]]
	**Oxidative damage to red blood cell membranes → ~~'''~~intravascular hemolysis~~'''~~		**Oxidative damage to red blood cell membranes → intravascular hemolysis
	**Majority of absorbed copper deposited in the liver via portal circulation → ~~'''~~hepatocellular necrosis~~'''~~		**Majority of absorbed copper deposited in the liver via portal circulation → hepatocellular necrosis
	**Free hemoglobin and direct copper nephrotoxicity → ~~'''~~[[Acute kidney injury\|acute tubular necrosis]]~~'''~~		**Free hemoglobin and direct copper nephrotoxicity → [[Acute kidney injury\|acute tubular necrosis]]
	**Direct toxic injury to skeletal muscle → ~~'''~~[[Rhabdomyolysis\|rhabdomyolysis]]~~'''~~		**Direct toxic injury to skeletal muscle → [[Rhabdomyolysis\|rhabdomyolysis]]

	==Clinical features==		==Clinical features==
	*Characteristic ~~'''~~blue-green vomitus~~'''~~ and ~~'''~~metallic taste~~'''~~ are classic early findings<ref name="Saravu2007"/>		*Characteristic blue-green vomitus and metallic taste are classic early findings<ref name="Saravu2007"/>
	*Presentation evolves over hours to days in a predictable organ-system pattern		*Presentation evolves over hours to days in a predictable organ-system pattern

Line 88:		Line 88:
	* Serum copper levels:		* Serum copper levels:
	**Whole blood copper correlates better with severity than serum copper<ref name="Chuttani1965">Chuttani HK, Gupta PS, Gulati S, Gupta DN. Acute copper sulfate poisoning. ''Am J Med''. 1965;39(5):849-854.</ref>		**Whole blood copper correlates better with severity than serum copper<ref name="Chuttani1965">Chuttani HK, Gupta PS, Gulati S, Gupta DN. Acute copper sulfate poisoning. ''Am J Med''. 1965;39(5):849-854.</ref>
	**Serum copper and ceruloplasmin do ~~'''~~not~~'''~~ reliably correlate with clinical severity or prognosis<ref name="Consultant">Acute Copper Sulfate Poisoning. ''Consultant360''. 2016.</ref>		**Serum copper and ceruloplasmin do not reliably correlate with clinical severity or prognosis<ref name="Consultant">Acute Copper Sulfate Poisoning. ''Consultant360''. 2016.</ref>
	**Useful if etiology unknown; not essential if history is clear		**Useful if etiology unknown; not essential if history is clear
	* Type and screen — anticipate need for transfusion		* Type and screen — anticipate need for transfusion
Line 146:		Line 146:
	===Acute kidney injury===		===Acute kidney injury===
	*Aggressive IV fluid resuscitation to maintain urine output		*Aggressive IV fluid resuscitation to maintain urine output
	* Hemodialysis is ineffective at removing copper (protein-bound) but ~~'''~~essential for supportive management of AKI~~'''~~ and its complications (hyperkalemia, uremia, volume overload)<ref name="Gamakaranage2011"/>		* Hemodialysis is ineffective at removing copper (protein-bound) but essential for supportive management of AKI and its complications (hyperkalemia, uremia, volume overload)<ref name="Gamakaranage2011"/>
	**Chelated copper complexes may be removed by dialysis		**Chelated copper complexes may be removed by dialysis
	**Peritoneal dialysis is inferior to hemodialysis for this purpose		**Peritoneal dialysis is inferior to hemodialysis for this purpose

← Older revision		Revision as of 23:02, 17 March 2026
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	*[[Rhabdomyolysis]]		*[[Rhabdomyolysis]]
	*[[Acute kidney injury]]		*[[Acute kidney injury]]
	*[[~~Intravascular hemolysis~~]]		*[[Dialysis]]

	==External Links==		==External Links==