Cardiac arrhythmias: From (transgenic) mice to men

Transgenic and gene-targeted mice now are frequently used to study cardiac arrhythmias due to the ease with which the mouse genome can be manipulated. Marked electrophysiologic differences are present between the mouse and hu man heart, however, and the utility of the arouse as a model for arrhythmia s and sudden death remains controversial. Tachyarrhythmias, bradyarrhythmia s, and ECG in the mouse need to be interpreted with extreme care and withou t preconceptions based on our experience with humans. Despite its limitatio ns, the mouse can provide a powerful tool to further our understanding of b asic mechanisms that underlie human cardiac electrophysiology.