Arsenic Poisoning Treatment Guidelines

Introduction to Arsenic Poisoning Treatment

Arsenic trioxide (ATO) is used to treat acute promyelocytic leukemia, but it is distinct from treating arsenic poisoning, as discussed in the European LeukemiaNet guidelines 1

DMSA (succimer) is the recommended first-line agent for chelation therapy in arsenic poisoning, potentially combined with dimercaptopropanol (BAL) in severe acute cases, along with supportive care and extracorporeal treatments when appropriate, according to treatment guidelines 1
BAL may have advantages in critical situations due to its lipophilicity, but it requires painful intramuscular injections and has an unpleasant odor 1
DMSA or combination therapy with monoisoamyl-DMSA (MiADMSA) shows superior efficacy in chronic poisoning cases, with a higher therapeutic index and lower toxicity profile compared to BAL 1
DMPS (dimercaptopropanesulfonate) may be considered as a first-line agent for most cases of arsenic poisoning, often in combination with BAL for acute severe poisoning 2

Supportive care, including fluid/electrolyte management and organ support, is essential for treating arsenic poisoning, as recommended by treatment guidelines 1
Long-term monitoring is crucial due to the risk of delayed complications, including cancers of the lung, bladder, and skin, with regular assessment of clinical symptoms, urinary arsenic levels, liver and kidney function tests, neurological assessment, and electrolyte balance and hydration status 1
Regular monitoring of urinary arsenic levels until normalization is crucial, along with assessment of organ function (liver, kidney, neurological) and long-term monitoring for potential development of cancers (lung, bladder, skin) in chronic exposure cases 3
Quantitative measurement of 24-hour urinary arsenic excretion is the most reliable laboratory test to confirm arsenic poisoning 4

Extracorporeal elimination techniques, such as hemodialysis, continuous venovenous hemofiltration, or peritoneal dialysis, may be considered to enhance arsenic elimination, although they may remove only small amounts of the total body arsenic burden 1
Chelation therapy should be carefully considered, with a preference for extracorporeal treatment (ECTR) to minimize exposure to chelating agents, as suggested by the Critical Care society 3

The World Health Organization and EPA set a recommended limit of 10 μg/L for drinking water, and levels above this are a potential concern for long-term exposure 4
Common sources of arsenic exposure include contaminated drinking water, particularly from ground sources like wells, and foods high in arsenic content, such as seafood, rice and rice products, mushrooms, and poultry, as reported by the Centers for Disease Control and Prevention and the American Cancer Society, with a moderate to low level of evidence 4
Reducing consumption of foods known to contain high levels of arsenic and maintaining good folate status can support arsenic elimination, with a low level of evidence based on expert opinion 4
Long-term exposure to arsenic levels above 10 μg/L has been associated with an increased risk of lung, bladder, and skin cancers, with a moderate level of evidence based on observational studies 4
The following table summarizes the recommended limits for arsenic in drinking water:

Organization	Recommended Limit (μg/L)
World Health Organization	10
EPA	10

Acute arsenic poisoning typically presents with severe nausea and vomiting, colicky abdominal pain, and profuse diarrhea, while chronic exposure produces skin pigmentation changes, palmar and plantar hyperkeratosis, and peripheral neuropathy, with a high to moderate level of evidence based on case reports and observational studies 2, 4
The American College of Medical Toxicology recommends monitoring airway patency, respiratory status, and hemodynamic parameters in cases of suspected acute arsenic ingestion, with a strength of evidence based on expert opinion 2