A study published in the journal, Circulation, in February of 2012 showed that over a 10 year follow up period, that people with the highest BPA levels had 33% increase in the risk for heart attacks. The study compared BPA measurements in 758 people who were initially healthy but later developed heart disease with 861 people who remained heart disease free. They found that the risk for heart attack over 10 years was much higher in those patients with the highest BPA found in their urine.