Table 1.

Action potential durations of left and right atrial myocytes by genotype

	WT		Kcna1−/−
	Left Atrium (n = 8/4)	Right Atrium (n = 8/5)	Left Atrium (n = 6/4)	Right Atrium (n = 4/3)
APD30, ms	5.6 ± 0.8	5.2 ± 0.6	6.3 ± 0.8	6.2 ± 0.7
APD50, ms	8.0 ± 1.1	7.9 ± 0.7	11.0 ± 1.8	8.6 ± 1.0
APD90, ms	49.9 ± 2.6	46.7 ± 2.9	70.1 ± 3.1*	102.6 ± 11.1†,‡

Values are means ± SE. APD₃₀, APD₅₀, and APD₉₀, action potential duration at 30%, 50%, and 90% of repolarization, respectively. Sample numbers (n) indicate myocytes per mouse. WT, wild type.

^*P < 0.01 vs. WT left atrium (Student’s unpaired t-test);

^†P < 0.01 vs. WT right atrium (Student’s unpaired t-test);

^‡P < 0.01 vs. Kcna1^−/− left atrium (Student’s unpaired t-test).