Frozen Channels (IMAGE) Rockefeller University Press Caption This illustration depicts how a segment in the two mutant Nav1.5 channels becomes immobilized during the cardiac action potential rather than returning to resting position, allowing charged ions to continue to leak into heart muscle cells. Credit Moreau et al., 2015 Usage Restrictions Reporters may freely use these materials in news coverage, with the appropriate credit information. 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.