Samsung Galaxy J7 Android smartphone. Announced Jun 2015. Features 5.5″ display, Snapdragon 615 chipset, 13 MP primary camera, 5 MP front camera, 3000 mAh battery, 16 GB storage, 1.5 GB RAM.

Background—T-wave alternans, which is associated with the genesis of cardiac fibrillation, has recently been related to discordant action potential duration (APD) alternans. However, the cellular ...