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Arsenic Poisoning – Comprehensive Medical Guide

Overview

Arsenic poisoning occurs when a person is exposed to toxic levels of arsenic, a naturally occurring element found in soil, water, and certain foods. It can be acute (short‑term, high‑dose exposure) or chronic (low‑dose exposure over months to years). Both forms damage multiple organ systems, primarily the skin, lungs, liver, kidneys, and nervous system.

Who it affects: Anyone can be exposed, but the highest risk groups include:

• People living in regions with arsenic‑contaminated groundwater (e.g., parts of Bangladesh, India, China, and the western United States).
• Workers in industries that use arsenic compounds (metal smelting, pesticide manufacturing, wood preservation).
• Individuals who consume large amounts of contaminated rice, seafood, or herbal supplements.

Prevalence: According to the World Health Organization (WHO), an estimated 150 million people worldwide drink water with arsenic levels above the recommended limit of 10 µg/L. In the United States, the CDC reports that about 2–3 % of private well water samples exceed this limit, affecting roughly 3–4 million people.

Symptoms

Symptoms vary by exposure type, dose, and duration. Below is a complete list with brief descriptions.

Acute Arsenic Poisoning (hours to days)

• Gastrointestinal distress: Nausea, vomiting (often profuse), abdominal cramps, and watery diarrhea, sometimes with blood.
• Cardiovascular effects: Rapid heart rate (tachycardia), low blood pressure (hypotension), and possible arrhythmias.
• Neurologic signs: Headache, confusion, seizures, and peripheral neuropathy (tingling or numbness of extremities).
• Renal involvement: Decreased urine output, flank pain, and acute kidney injury.
• Skin changes: Pallor, flushing, and a metallic taste in the mouth.
• Respiratory symptoms: Shortness of breath, cough, and pulmonary edema in severe cases.

Chronic Arsenic Poisoning (months to years)

• Skin lesions: Hyperpigmentation (dark patches), hypopigmentation (light patches), and characteristic “raindrop” keratoses on the palms and soles.
• Peripheral neuropathy: Burning, tingling, or numbness that typically starts in the feet and may progress upwards.
• Cardiovascular disease: Hypertension and an increased risk of atherosclerosis.
• Respiratory problems: Chronic cough, bronchitis, and increased susceptibility to lung infections.
• Gastrointestinal symptoms: Chronic abdominal pain and intermittent diarrhea.
• Liver & kidney dysfunction: Elevated liver enzymes, proteinuria, and reduced glomerular filtration rate.
• Endocrine disturbances: Diabetes mellitus and altered thyroid function.
• Cancer risk: Higher incidence of skin, bladder, lung, and kidney cancers.

Causes and Risk Factors

Sources of Exposure

• Contaminated drinking water: Naturally occurring arsenic leaches into groundwater; shallow wells are most vulnerable.
• Food: Rice and rice‑based products, seafood (especially shellfish), and certain herbs (e.g., traditional Chinese medicines) can contain inorganic arsenic.
• Occupational settings: Smelting, pesticide production, wood preservation, glass manufacturing, and semiconductor fabrication.
• Environmental accidents: Industrial spills, mining runoff, and the use of arsenic‑based wood preservatives (e.g., chromated copper arsenate).
• Smoking: Tobacco smoke contains arsenic, adding to overall body burden.

Risk Factors

• Living in endemic regions with high groundwater arsenic levels.
• Using private wells that are not regularly tested.
• Employment in high‑arsenic industries without appropriate protective equipment.
• High consumption of rice or rice products—especially for infants (infant rice cereals).
• Pregnancy: fetal exposure can lead to low birth weight and developmental issues.

Diagnosis

Diagnosing arsenic poisoning involves a combination of clinical evaluation, exposure history, and laboratory testing.

Clinical Assessment

• Detailed history of water sources, diet, occupational exposure, and symptom chronology.
• Physical examination focusing on skin changes, neurologic deficits, and signs of organ dysfunction.

Laboratory Tests

• Urine arsenic speciation: Measures inorganic arsenic and its metabolites (MMA, DMA). Spot urine adjusted for creatinine is most useful for recent exposure (within 2‑3 days).
  *Reference: CDC, “Biomonitoring of Arsenic in Urine.”
• Blood arsenic level: Helpful in acute poisoning; levels >50 µg/L generally indicate significant exposure.
• Hair and nail analysis: Reflects chronic exposure over weeks to months; useful when urine is normal but suspicion remains.
• Renal and liver function tests: Serum creatinine, BUN, ALT, AST.
• Complete blood count (CBC): May show anemia or leukocytosis.
• Electrolytes & arterial blood gases: Detect metabolic acidosis common in acute cases.

Imaging & Specialized Tests

• Chest X‑ray or CT if respiratory symptoms are present.
• Electrocardiogram (ECG) for cardiac arrhythmias.
• Neurological EMG/NCS if peripheral neuropathy is severe.

Treatment Options

Acute Poisoning

1. Supportive care: Fluid resuscitation, electrolyte correction, and treatment of shock.
2. Gastrointestinal decontamination: Single‑dose activated charcoal (if patient presents <6 hours after ingestion).
3. Chelation therapy:
   • Dimercaprol (British anti‑Lewisite, BAL) – traditional chelator; administered intramuscularly.
   • Dimercaptosuccinic acid (DMSA, Succimer) – oral chelator with fewer side effects; preferred for children and mild‑moderate cases.
   • Dosing and duration depend on blood arsenic level and clinical response; typically 5‑10 days.
4. Hemodialysis: Considered when renal failure is present or arsenic levels remain >200 µg/L despite chelation.

Chronic Poisoning

• Removal of exposure source: Switch to arsenic‑free water, alter diet, implement workplace controls.
• Long‑term chelation: DMSA is the most commonly used agent; treatment courses of 3–6 months may be repeated based on urinary arsenic trends.
• Symptom‑directed care:
  • Neuropathic pain – gabapentin, pregabalin, or duloxetine.
  • Skin lesions – topical keratolytics, regular dermatologic monitoring; early excision of suspicious lesions.
  • Hypertension – ACE inhibitors or ARBs.
• Nutritional support: Adequate intake of folate, vitamin B12, and antioxidants (e.g., vitamin C, selenium) may aid arsenic methylation and excretion.

Living with Arsenic Poisoning

Managing chronic arsenic exposure requires daily vigilance and lifestyle adjustments.

• Water safety: Use certified arsenic removal systems (reverse osmosis, ion exchange) or purchase bottled water that meets EPA standards.
• Dietary choices: Limit rice intake (especially for children); opt for quinoa, barley, or millet. Rinse rice thoroughly and cook with excess water (4:1 ratio) and discard the water.
• Regular monitoring: Schedule quarterly urine arsenic tests and annual skin examinations.
• Medication adherence: Take chelation agents exactly as prescribed; set reminders.
• Exercise & heart health: Moderate aerobic activity lowers blood pressure and improves circulation, helping peripheral neuropathy.
• Psychosocial support: Join patient support groups and consider counseling for anxiety related to chronic illness.

Prevention

• Test water sources: Private well owners should test annually for arsenic; kits are available through state health departments.
• Install filtration: Certified Point‑of‑Use (POU) filters that remove >95 % of inorganic arsenic.
• Occupational safety: Use personal protective equipment (PPE), follow OSHA regulations, and participate in workplace monitoring programs.
• Food awareness: Choose a varied diet, limit rice-based infant foods, and prefer arsenic‑tested rice products (many brands now label “low arsenic”).
• Public health measures: Support community initiatives that provide arsenic‑free water supplies in endemic areas.

Complications

If left untreated, arsenic poisoning can lead to serious, sometimes irreversible, health problems:

• Skin cancer (squamous cell carcinoma, basal cell carcinoma) and hyperkeratotic lesions.
• Bladder, lung, and kidney cancers – chronic exposure increases risk 2‑3 fold.
• Peripheral neuropathy that may become permanent.
• Chronic kidney disease progressing to end‑stage renal failure.
• Cardiovascular disease including hypertension, coronary artery disease, and peripheral arterial disease.
• Developmental delays and low birth weight in infants born to exposed mothers.
• Diabetes mellitus – arsenic interferes with insulin signaling.

When to Seek Emergency Care

References

1. World Health Organization. Arsenic Fact Sheet. 2023.
2. Centers for Disease Control and Prevention. Arsenic Toxicity. Updated 2022.
3. National Institute of Environmental Health Sciences. Arsenic. 2024.
4. Mayo Clinic. Arsenic poisoning. Reviewed 2023.
5. Cleveland Clinic. Arsenic poisoning: Symptoms and treatment. 2023.
6. U.S. Environmental Protection Agency. Drinking Water Standards and Regulations. 2022.
7. International Agency for Research on Cancer. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans – Arsenic. 2012.

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