Table 3.

Mean number of induced early afterdepolarizations per cell

	Dct-null CMLCs N = 11	Dct-het CMLCs N = 12	Atrial myocytes N = 23
Baseline	0.89 ± 0.34*†	0‡	0‡
5 μmol/L H2O2	1.61 ± 0.32*†	0.87 ± 0.23†‡	0.41 ± 0.21*‡
10 μmol/L H2O2	2.22 ± 0.30*†	1.54 ± 0.28†‡	0.86 ± 0.27*‡
25 μmol/L H2O2	2.98 ± 0.34†	2.46 ± 0.32†	1.39 ± 0.35*‡
50 μmol/L H2O2	3.12 ± 0.35†	2.78 ± 0.37†	1.64 ± 0.39*‡

Atrial myocyte group contains data combined from both Dct-null and Dct-het atrial myocytes.

^*P < 0.05 compared to Dct-het melanocytes at same H₂O₂ concentration.

^†P < 0.05 compared to Dct-null and Dct-het atrial myocytes at same H₂O₂ concentration.

^‡P < 0.05 compared to Dct-null melanocytes at same H₂O₂ concentration.