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Figures

Figure 1

Carboxyhemoglobin level post arrival time to Emergency Department. COHb level remained elevated up to 12 hours after arrival despite being on high flow oxygen therapy.

Methylene chloride is a common occupational exposure. A metabolic product of methylene chloride is carbon monoxide (CO) and toxicity can lead to increased carboxyhemoglobin (COHb) levels. The half-life of COHb is prolonged in methylene chloride toxicity as the conversion to CO can last several hours beyond the exposure. In addition, methylene chloride can be stored in tissues, particularly adipose tissue, and converted to CO over time. The following case demonstrates that patients exposed to methylene chloride can essentially become CO factories with the production of CO within the body continuing long after exposure to the toxin.

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