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Carbon Monoxide Poisoning: Everything You Need to Know
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Carbon Monoxide Poisoning: Everything You Need to Know

. Chapters 0:00 Introduction 1:04 Symptoms of Carbon monoxide poisoning 1:56 Risk of Carbon monoxide poisoning 2:25 Diagnosis of Carbon monoxide poisoning 2:38 Treatment of Carbon monoxide poisoning Carbon monoxide poisoning typically occurs from breathing in carbon monoxide (CO) at excessive levels.[3] Symptoms are often described as "flu-like" and commonly include headache, dizziness, weakness, vomiting, chest pain, and confusion.[1] Large exposures can result in loss of consciousness, arrhythmias, seizures, or death.[1][2] The classically described "cherry red skin" rarely occurs.[2] Long-term complications may include chronic fatigue, trouble with memory, and movement problems.[5] CO is a colorless and odorless gas which is initially non-irritating.[5] It is produced during incomplete burning of organic matter.[5] This can occur from motor vehicles, heaters, or cooking equipment that run on carbon-based fuels.[1] Carbon monoxide primarily causes adverse effects by combining with hemoglobin to form carboxyhemoglobin (HbCO) preventing the blood from carrying oxygen and expelling carbon dioxide as carbaminohemoglobin.[5] Additionally, many other hemoproteins such as myoglobin, Cytochrome P450, and mitochondrial cytochrome oxidase are affected, along with other metallic and non-metallic cellular targets.[2][6] Diagnosis is typically based on a HbCO level of more than 3% among nonsmokers and more than 10% among smokers.[2] The biological threshold for carboxyhemoglobin tolerance is typically accepted to be 15% COHb, meaning toxicity is consistently observed at levels in excess of this concentration.[7] The FDA has previously set a threshold of 14% COHb in certain clinical trials evaluating the therapeutic potential of carbon monoxide.[8] In general, 30% COHb is considered severe carbon monoxide poisoning.[9] The highest reported non-fatal carboxyhemoglobin level was 73% COHb.[9] Efforts to prevent poisoning include carbon monoxide detectors, proper venting of gas appliances, keeping chimneys clean, and keeping exhaust systems of vehicles in good repair.[1] Treatment of poisoning generally consists of giving 100% oxygen along with supportive care.[2][5] This should generally be carried out until symptoms are no longer present and the HbCO level is less than 3%/10%.[2] Carbon monoxide poisoning is relatively common, resulting in more than 20,000 emergency room visits a year in the United States.[1][10] It is the most common type of fatal poisoning in many countries.[11] In the United States, non-fire related cases result in more than 400 deaths a year.[1] Poisonings occur more often in the winter, particularly from the use of portable generators during power outages.[2][12] The toxic effects of CO have been known since ancient history.[13][9] The discovery that hemoglobin is affected by CO emerged with an investigation by James Watt and Thomas Beddoes into the therapeutic potential of hydrocarbonate in 1793, and later confirmed by Claude Bernard between 1846 and 1857.[9]

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