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Asystole is also known as flatline. It is a state of cardiac standstill with no cardiac output and no ventricular depolarization, as shown in the image below; it eventually occurs in all dying patients.

Pulseless electrical activity (PEA) is the term applied to a heterogeneous group of dysrhythmias unaccompanied by a detectable pulse. Bradyasystolic rhythms are slow rhythms; they can have a wide or narrow complex, with or without a pulse, and are often interspersed with periods of asystole. When discussing pulseless electrical activity, ventricular fibrillation (VF) and ventricular tachycardia (VT) are excluded.