Cardiovascular diseases are the leading cause of death worldwide, regardless of the country's economic status. We studied 50 patients admitted to the Bragan a Medical-Surgical Emergency Service of the Nordeste Local Health Unit who were diagnosed with acute myocardial infarction in 2015 and 2016, with the aim of describing the circadian rhythm of acute myocardial infarction. Of the 50 patients studied, 52 per cent were male and the most common age...