A Sodium Surprise (IMAGE) Washington University in St. Louis Caption Engineers at Washington University in St. Louis have discovered something new about how sodium ions act in cardiac muscle, a finding that could someday help inform treatment of heart arrhythmia. Credit Washington University in St. Louis Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.