What cardiac arrhythmia requires immediate intervention?

Asystole, which is a state of no electrical activity in the heart, demands immediate intervention because it indicates that the heart is not pumping blood, resulting in a complete lack of circulation. This condition is life-threatening and requires prompt resuscitation efforts, typically through cardiopulmonary resuscitation (CPR) and the use of an automated external defibrillator (AED), if available. Without immediate action, asystole can quickly lead to death due to the body's critical need for oxygenated blood.

In contrast, while atrial fibrillation can be concerning and may require management to prevent stroke or tachycardia, it is generally not considered an immediate threat to life. Ventricular tachycardia can become dangerous, especially if sustained or with a pulse, but it does not require the same level of urgent intervention as asystole does. Bradycardia, or an abnormally slow heart rate, can be serious but often does not necessitate immediate action unless it is symptomatic or causing hemodynamic instability.