Asystole is a terminal rhythm.

Asystole is cardiac standstill with no cardiac output and no ventricular depolarization; it eventually occurs in all dying patients.

A precursor to asystole may be pulseless electrical activity (PEA), which is when the heart still has electrical activity, but does not have mechanical capture.

Do you know that 90% of the stroke could have been prevented?
Smaller than a credit card, KardiaMobile allows you to capture single-lead EKGs anywhere, anytime. In 30 seconds, it records a medical-grade EKG, which can be relayed to a doctor for analysis and diagnosis. It is also easily attaches to most smartphones making it convenient to always have with you.