Cardiac arrest

Cardiac arrest or heart failure was the term for one's heart stopping. Many things could cause failure, such as a physical blow, an electrical pulse and shock. (TV The Shakespeare Code, The Power of Three)

For as many ways the heart could fail, there were ways in which it could be restarted again. Defrillibrators were a common means. (TV: The Power of Three)

Resuscitation is another way; however species with a binary vascular system would require both hearts to be restarted at the same time. (TV: Smith and Jones)