When a signal doesn't make it to the ventricles from the atria, and if a long enough time passes by, let's say about 2 seconds, then ventricle's pacemaker cells kick in, sort of as a fail-safe mechanism called a ventricular escape beat.

当一个电信号无法传导至心室，假设延误的时间足够长，比如说长达约2秒，心室起搏细胞便会成为起搏点，这是一种安全保护机制，我们称之为心室逸搏。