What occurs when the heart stops beating suddenly, leading to the cessation of respiration and body functions?

• A. Cardiac arrest
• B. Stroke
• C. Arrhythmia
• D. Heart failure

Answer: (A)

Cardiac arrest occurs when the heart stops beating suddenly, resulting in the immediate cessation of effective blood circulation and subsequently leading to the lack of respiration and loss of consciousness. This life-threatening condition demands immediate medical intervention, typically cardiopulmonary resuscitation (CPR) and defibrillation, to restore normal heart function and prevent death.

In contrast, a stroke refers to a disruption of blood flow to the brain, which can cause brain damage but is not synonymous with the heart ceasing to function. Arrhythmia involves irregular heartbeats and may or may not lead to cardiac arrest; it is a condition rather than a sudden event like cardiac arrest. Heart failure is a chronic condition where the heart does not pump blood effectively, but it is typically not an acute, sudden stoppage of the heartbeat, as seen in cardiac arrest.