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Carbon monoxide poisoning: a comprehensive review for prehospital specialists

03 February 2012
Volume 4 · Issue 2

Abstract

As one of the leading causes of poisonings worldwide, it is imperative that prehospital specialists are aware of carbon monoxide (CO) poisoning and its management. Awareness of the epidemiology, and the common presentations of CO poisoning may lead to prompt evaluation and early initiation of life-saving therapy. Children under 5 years of age have the highest incidence of CO-related ER visits and are at greatest risk of CO toxicity. The clinical features are nonspecific and misdiagnoses are common. Therefore, prehospital providers should have a high index of suspicion for CO intoxication in patients that experience headache, vomiting, or altered level of consciousness following exposure to hydrocarbon combustion within an enclosed space. A carboxyhaemoglobin level is a quick and reliable way to diagnose CO exposure. To prevent complications such as altered cerebellar function, seizures, rhabdomyolysis and dysrhythmias, early recognition and treatment is imperative. Removal from the source of exposure and the provision of 100% oxygen form the cornerstone of management. Preventive strategies should also be explored in susceptible populations.

Carbon monoxide (CO) is the major cause of death from poisoning in the UK (Turner et al, 1999). Based on Centers for Disease Control and Prevention (CDC) data from 2004-2006, children younger than 5 years had the highest rate estimated rate of CO-related emergency room visits amongst all age groups (CDC, 2008). It is important for the prehospital specialist to remember certain situations may lend themselves to a greater risk of CO poisoning. Historical clues include a history of enclosed spaces, especially during colder months when the use of heating is more likely.

Numbers of cases sublethal exposure to CO in the UK are traditionally quoted as 200 per year, but up 250 000 gas appliances are condemned annually. Therefore, as many as 25 000 people every year may be exposed to the effects of CO within the home. It is believed that an overwhelming majority of cases go unrecognized as patients are often misdiagnosed and as a result, remain untreated (Walker and Hay, 1999).

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