Why is it crucial to check for breathing in unresponsive casualties?

Checking for breathing in unresponsive casualties is vital because it directly informs whether immediate cardiopulmonary resuscitation (CPR) is needed. If a person is unresponsive and not breathing or only gasping, it indicates cardiac arrest or severe respiratory compromise, requiring prompt intervention to prevent brain death or fatal outcomes. By assessing breathing, responders can ascertain the urgency of initiating life-saving measures such as CPR, which can maintain blood circulation and oxygenation to vital organs until professional medical help arrives. This critical step is part of the basic life support protocol and is essential for effective emergency response in any life-threatening situation.