Fig. 6.

Prolongation of atrial action potentials and refractoriness, cellular depolarization and spontaneous arrhythmias. A, Typical recordings of action potentials by glass micro-electrodes in superfused right and left atrial preparations in wild-type (WT) and TG atria. B, Distribution of resting membrane potentials in TG (filled bars; 234 cells from 11 mice) and WT (open bars; 196 cells from 8 mice) atria. C, Fast spontaneous atrial tachycardia (left recording) in a right atrial TG trabeculum, representative recording.