Cardiac electrical function is preserved in <i>Cntn2</i>^{<i>3’UTR-IRES-Cre-EGFP/+</i>} mice.

<p>(a-j) Serial surface lead II ECGs were recorded on both groups of mice (n = 9 per group) under mild anesthesia at P7, P14, P21, P28, and P42. Exemplary ECG traces for P42 (a) WT and (b) <i>Cntn2</i>^{<i>3’UTR-IRES-Cre-EGFP/+</i>} mice are shown. Scale size: 40 milliseconds (ms). (c) PR interval (in seconds), (d) QRS width (in seconds), (e) RR interval (in seconds), and (f) PR/RR ratio were measured at P7, P14, P21, and P42. At P28, (g) PR interval (in seconds), (h) QRS width (in seconds), (i) RR interval (in seconds), and (j) PR/RR ratio were measured pre- and post-isoproterenol (-/+ Iso) injection. Black circles represent individual WT and <i>Cntn2</i>^{<i>3’UTR-IRES-Cre-EGFP/+</i>} mice used in this study. Blue and red bars represent mean values for each parameter in WT and <i>Cntn2</i>^{<i>3’UTR-IRES-Cre-EGFP/+</i>} mice, respectively. No statistically significant differences were observed between groups. ns, not significant.