Ranolazine為一新穎抗心絞痛藥物，其作用機轉為何？
抑制late component of the \mathrm{Na}^{+} current
\mathrm{Na}^{+}
活化rapid component of the delayed rectifier \mathrm{K}^{+} current
\mathrm{K}^{+}
nitric oxide donor
alpha-1 adrenergic receptor blocker
