Which type of cardiac arrest is characterized by the absence of heart movement?

Asystole is characterized by the complete absence of electrical activity in the heart, which results in no heart movement or contraction. This can be seen on an electrocardiogram (ECG) as a flat line, indicating that the heart is not functioning to produce any kind of cardiac output or pulse. Unlike other conditions, such as ventricular tachycardia or atrial fibrillation, asystole signifies a total lack of heart activity, which is critical to recognize in emergencies as it requires immediate and advanced resuscitation efforts. In contrast, pulsus alternans refers to a variation in pulse pressure, typically seen in cases of heart failure, and does not indicate a complete cessation of heart movement. Understanding the specific characteristics of asystole is crucial for effective management in resuscitation scenarios.