About this episode
Contributor: Megan Hurley MD Educational Pearls: Acute toxicity of heavy metals: Gastrointestinal upset is the most common presentation Chronic toxicity of heavy metals: Symptoms depend on the metal ingested Increased risk of cancer Altered mentation Developmental delays (in children) Kidney failure Four heavy metals that are tested for in a general panel and their sources: Lead Old paint (homes built before 1977) or some older toys Pipes of older homes or those with corrosive agents May obtain testing kits from home improvement stores to test water supply Mercury Previously in thermometers, although much less common now Compact fluorescent lightbulbs, LCD screens, and some batteries Large predatory fish like tuna, swordfish, dolphins, and shark Arsenic sources Most commonly found in pesticides Contaminated groundwater (especially private wells) Cadmiun sources Most commonly found in tobacco smoke Batteries Metal plating and welding Additional heavy metals that require specific testing Chromium, Nickel, & Thallium Thallium is found in rodenticides, pesticides, and fireworks Management of heavy metal toxicity depends on the intoxicant Generally, chelation therapy is used for acute and severe cases Arsenic: dimercaprol or DMSA Mercury: DMPS (chronic or mild) or DMSA (severe) Lead: succimer is first line, followed by dimercaprol or EDTA References Baker BA, Cassano VA, Murray C; ACOEM Task Force on Arsenic Exposure. Arsenic Exposure, Assessment, Toxicity, Diagnosis, and Management: Guidance for Occupational and Environmental Physicians. J Occup Environ Med. 2018;60(12):e634-e639. doi:10.1097/JOM.0000000000001485 Balali-Mood M, Naseri K, Tahergorabi Z, Khazdair MR, Sadeghi M. Toxic Mechanisms of Five Heavy Metals: Mercury, Lead, Chromium, Cadmium, and Arsenic. Front Pharmacol. 2021;12:643972. Published 2021 Apr 13. doi:10.3389/fphar.2021.643972 Kinally C, Fuller R, Larsen B, Hu H, Lanphear B. A review of lead exposure source attributional studies. Sci Total Environ. 2025;990:179838. doi:10.1016/j.scitotenv.2025.179838 Jannetto PJ, Cowl CT. Elementary Overview of Heavy Metals. Clin Chem. 2023;69(4):336-349. doi:10.1093/clinchem/hvad022 Järup L. Hazards of heavy metal contamination. Br Med Bull. 2003;68:167-182. doi:10.1093/bmb/ldg032 Zhang H, Reynolds M. Cadmium exposure in living organisms: A short review. Sci Total Environ. 2019;678:761-767. doi:10.1016/j.scitotenv.2019.04.395 Summarized & Edited by Jorge Chalit, OMS4 Donate: https://emergencymedicalminute.org/donate/