• Kerlen J Chee, Douglas Nilson, Robert Partridge, Ashley Hughes, Selim Suner, Andrew Sucov, and Gregory Jay.
• Department of Emergency Medicine, Rhode Island Hospital, Providence, Rhode Island 02903, USA. kerlenchee@gmail.com
• Clin Toxicol (Phila). 2008 Jun 1;46(5):461-9.

IntroductionThe diagnosis of carbon monoxide poisoning can be difficult because the symptoms are nonspecific and may mimic other illnesses. If carbon monoxide poisoning is suspected, the standard test at this time is venous or arterial carboxyhemoglobin levels. A new device, the Rad-57 pulse CO-oximeter (Masimo Inc.), can measure carboxyhemoglobin levels non-invasively at emergency department triage.MethodsThe pulse CO-oximeter was utilized in our emergency department triage to measure carboxyhemoglobin levels on all patients. A retrospective chart review was then conducted to identify all patients with elevated levels.Case SeriesOut of an estimated 74,880 patients who had their SpCO measured and documented at triage, seven patients who presented with vague complaints were diagnosed with occult carbon monoxide poisoning. Their diagnosis was facilitated by the non-invasive pulse CO-oximeter, which measured their carboxyhemoglobin levels when the standard vital signs were also documented at triage.ConclusionsThe non-invasive pulse CO-oximeter could be a major triage tool for identifying unsuspected carbon monoxide poisoning among patients with nonspecific symptoms.

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