Heart conduction (IMAGE) Virginia Tech Caption Steven Poelzing, associate professor at the Fralin Biomedical Research Institute at VTC, leads a team of cardiovascular scientists studying electrical conduction in the heart. Poelzing's lab recently published a study that showed increasing sodium and calcium levels in the bloodstream helps keep dangerous heart rhythms, triggered by potassium overdose, at bay. Credit Clayton Metz/Virginia Tech 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.