In which scenario should you first call for help before starting CPR?

In the context of providing Basic Life Support (BLS), the priority is to ensure that help is summoned promptly, especially when dealing with adult patients. When you are alone with an adult victim, it's crucial to call for help first before starting CPR. This is primarily because adult cardiac arrest situations often require advanced medical assistance that a rescuer cannot provide alone.

In this scenario, calling for help allows emergency personnel to be on their way while you initiate CPR. This is especially vital because adult patients may have a higher likelihood of survival if CPR is administered in conjunction with timely defibrillation and advanced medical intervention.

For a child who is unresponsive, initiating CPR before calling for help would generally be appropriate since children often require immediate intervention. Similarly, in a drowning victim case, direct assistance is also critical and may require focused resuscitation efforts initially if the victim is not breathing. In situations where the scene is unsafe, personal safety must be prioritized, and calling for help is generally the first course of action to avoid putting oneself in harm's way.