心脏起搏器（If）电流的特性。

Boll Soc Ital Biol Sper. 1984 May 30;60 Suppl 4:29-33.

The cardiac pacemaker if current, once thought to be a pure K+ current, is shown to be carried by both Na and K. It is inward and activating during hyperpolarizations negative to -50/-60 mV in normal conditions. Its kinetics are delayed during both activation and deactivation.

心脏起搏器电流（曾被认为是一种纯钾电流）现显示由钠和钾共同携带。在正常情况下，当超极化至负于-50/-60 mV时，它是内向且起激活作用的。其动力学在激活和失活过程中均有延迟。