What is a common sign that a person may be in cardiac arrest?

Unconsciousness and absence of pulse are critical indicators that a person may be in cardiac arrest. When the heart stops beating effectively, it leads to a lack of blood flow to the brain and other vital organs, resulting in the individual becoming unresponsive or unconscious. Additionally, a pulse can no longer be detected because the heart is not pumping blood through the circulatory system. Recognizing these signs is paramount, as they indicate the necessity for immediate medical intervention, such as CPR, to restore circulation and oxygenation.

In contrast, sudden violent coughing often indicates respiratory issues but does not directly suggest cardiac arrest. Fainting without recovery may suggest a transient loss of consciousness due to various causes, not specifically cardiac arrest. Consistent high blood pressure is typically a sign of ongoing cardiovascular stress or other health conditions, but it does not indicate immediate cardiac arrest. Understanding these distinctions is crucial for providing timely and effective emergency response.