Table 1.

Action potential parameters of rat ventricular cells before and after exposure to cumulative increase of three concentrations of piceatannol at 1 Hz stimulation.

Piceatannol (µmol·L−1)	RMP (mV)	Vmax (v/s)	APD50 (ms)	APD90 (ms)
0	−80.3 ± 1.0	337.5 ± 21.8	6.9 ± 1.5	16.6 ± 1.8
3	−80.2 ± 1.4	318.5 ± 22.0	15.4 ± 4.9	27.8 ± 6.5
10	−82.3 ± 1.7	242.5 ± 31.2*	53.0 ± 16.5*	63.7 ± 17.1*
30	−81.7 ± 1.4	161.3 ± 18.8*	82.6 ± 15.3*	95.8 ± 14.9*

Data are expressed as mean ± s.e.m. from different 6 cells. Asterisk indicates statistical significance (P < 0.05) as compared between control and drug-treated groups by paired t-test. RMP: resting membrane potential; V_max: the maximum upstroke velocity of action potential; APD₅₀ and APD₉₀: action potential duration measured at 50 and 90% repolarization.