Cardiac arrhythmias in <i>Scn5a</i>^+/− mice with severe phenotype.

<p>Representative episodes of spontaneous ventricular arrhythmias recorded in two different <i>Scn5a</i>^+/− mice with a severe phenotype under anesthesia. An ECG recorded in an age-matched WT mouse is given for comparison. Scale bar, 500 ms.