What is the first step to take when dealing with unresponsive casualties?

When dealing with unresponsive casualties, the first step to take is to check for breathing and circulation. This step is critical because establishing whether the casualty is breathing and has a pulse is essential for determining the next course of action. If the person is not breathing or does not have a detectable pulse, immediate resuscitation efforts such as CPR may be necessary to keep the individual alive until further medical help can be obtained.

In the context of emergency medical response, prioritizing the evaluation of vital functions, such as breathing and circulation, allows responders to act quickly and effectively to prevent further deterioration of the casualty's condition. Addressing these basic life-support measures early can be the difference between life and death.

While assessing body temperature and examining for potential injuries are important aspects of a complete patient evaluation, they should come after establishing whether the casualty is breathing or has circulation, as these factors are more critical to immediate survival. Administering medications should only occur after basic life support has been assessed and any life-threatening conditions addressed, making it a less immediate priority in this situation.