1) ⅠKATP 中的 Kir 6.2 亚基对细胞内 ATP 浓度非常敏感,在细胞内 ATP 减少或耗竭时 ⅠKATP 开放,K+外流增加,动作电位平台期缩短,电压依赖性 Ca 2+ 通道活性下降,通过减少 Ca 2+内流抑制触发活动,缩短除窦房结以外的心肌组织动作电位恢复时间、不应期以及 QT 间,从而发挥潜在抗心律失常作用。
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