In case of cardiac arrest, what immediate action should be taken?

In the event of cardiac arrest, the immediate action that should be taken is to start chest compressions. This is crucial because when the heart stops beating, blood circulation halts, which can lead to organ damage and death if not promptly addressed. Chest compressions are a vital component of cardiopulmonary resuscitation (CPR) that help maintain blood flow to vital organs, improving the chances of survival until further medical assistance can be provided.

Starting chest compressions without delay is emphasized in guidelines for CPR because it can help buy time for advanced care to arrive, such as defibrillation or advanced airway management. The effectiveness of compression can help maintain some level of blood circulation, thereby reducing the risk of brain damage and increasing the likelihood of a successful resuscitation.

The other options, while they may seem relevant, do not address the immediate necessity of restoring circulation. Offering water is not appropriate as the person is not in a condition to swallow and could risk choking. Checking for a pulse can waste precious time; if there is no pulse detected, immediate action is needed, so it's often recommended to skip this step and start compressions right away. While calling for a nurse could be part of the overall response, it does not substitute the urgent