Table 3.

Left ventricular epicardial APD₉₀ and CaTD₉₀

		Baseline				H₂O₂
PCL		LV base		LV apex		LV base		LV apex
(ms)		APD90	CaTD90	APD90	CaTD90	APD90	CaTD90	APD90	CaTD90
300	NR	112 ± 2	195 ± 4	115 ± 6	190 ± 3	113 ± 3	195 ± 16	116 ± 1	185 ± 15
	SHR	128 ± 7***, †††	178 ± 21	108 ± 4†	170 ± 8†††	135 ± 14**, ††	200 ± 2*	107 ± 7	185 ± 3
250	NR	98 ± 9	167 ± 7	96 ± 5	164 ± 8	100 ± 4	143 ± 4	99 ± 12	136 ± 12
	SHR	114 ± 19	142 ± 7†††	99 ± 18	141 ± 9†, †	125 ± 11*, †††	149 ± 4†	104 ± 19	149 ± 20
200	NR	94 ± 8	123 ± 3	93 ± 17	125 ± 2	94 ± 9	125 ± 12	92 ± 10	124 ± 18
	SHR	110 ± 9†	120 ± 3	99 ± 15	121 ± 7	119 ± 14*, ††	130 ± 7	102 ± 18	124 ± 7
150	NR	88 ± 16	112 ± 9	87 ± 14	114 ± 1	91 ± 6	115 ± 7	88 ± 10	114 ± 2
	SHR	100 ± 8	116 ± 6	88 ± 15	115 ± 6	115 ± 7*, †††	124 ± 6†	89 ± 17	120 ± 11

Simultaneous voltage and calcium imaging (four pairs of recordings at the LV base and four pairs at the LV apex per heart, per PCL) were performed for six NR and six SHR hearts before and after perfusion with H₂O₂. Data are reported as the mean ± SD. Intragroup comparison: *P < 0.05, **P < 0.005, ***P < 0.0005; intergroup comparison: ^† P < 0.05, ^†† P < 0.005, ^††† P < 0.0005; the bootstrap method.