What is asystole?

Asystole refers to a state of no electrical activity in the heart, leading to a complete absence of heartbeats. In this condition, the heart is unable to pump blood because there are no impulses driving the contraction of the cardiac muscles. This is a critical and life-threatening situation often seen in patients experiencing cardiac arrest. Since asystole indicates the heart is not functioning at all, immediate medical intervention is required to attempt to revive the patient. Understanding this concept is crucial in emergency medical situations, as recognizing asystole can guide responders in choosing appropriate treatment measures, such as beginning CPR and administering medications as needed.

The other choices describe different heart rhythm conditions that either involve some level of electrical activity or specific characteristics of heart rates, but they do not accurately define asystole.