We describe two cases of myocardial infarction with ST-segment elevation on electrocardiogram associated with carbon monoxide (CO) poisoning, a condition rarely reported in the literature. The first was a 62-year-old woman who experienced chest pain in the emergency department (ED) while being assessed for exposure to carbon monoxide in her home. The second was an 80-year-old man who fainted at home and was found to have ST elevation during the ED workup. After hospitalization, he returned home and soon thereafter had difficulty walking and speaking. The responding paramedics detected a very high CO level in the home. Both patients received hyperbaric oxygen therapy within the first several hours of presentation. For this combination of conditions, it is difficult to derive evidence-based management recommendations, given the paucity of cases reported to date. We conclude that rapid consultation with interventional cardiology and consideration of angioplasty or stenting are appropriate, especially when electrocardiographic findings and echocardiography point to a specific coronary distribution. Hyperbaric oxygen therapy might have a role in the treatment, based on its effects on myocardial ischemia and injury in other models.
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