Which factor can indicate a more favorable outcome in an out-of-hospital cardiac arrest?

In cases of out-of-hospital cardiac arrest, a witnessed cardiac arrest is associated with a more favorable outcome because it generally leads to more timely intervention. When a cardiac arrest is witnessed, bystanders are more likely to initiate immediate cardiopulmonary resuscitation (CPR) and call emergency services without delay. This quick response is crucial as the chances of survival decrease significantly with every passing minute without intervention. Additionally, a witnessed event often means that defibrillation can happen sooner, particularly if an automated external defibrillator (AED) is readily available.

Being able to promptly establish basic life support, along with rapid access to advanced medical care, significantly increases the likelihood of a positive outcome, highlighting the immense importance of witness presence in these critical situations.