A new model to perform electrophysiological studies in the early embryonic mouse heart.

Background: The first electrocardiograms (ECGs) have been recorded with a capillary electrometer in the late 19(th) century by John Burdon Sanderson and Augustus Waller. In 1903 Willem Einthoven used the much more sensitive string galvanometer and was awarded Nobel Price in Medicine for this discovery. Though the physical principles of that era are still in use, there have been many advances but also challenges in cardiac electrophysiology over the last decades.