What should you instruct your colleague to do if you find an adult victim unresponsive, not breathing, and with no pulse?

When you encounter an adult victim who is unresponsive, not breathing, and without a pulse, the first critical step is to activate the emergency response system and retrieve an Automated External Defibrillator (AED). This is essential because time is of the essence in cases of cardiac arrest. Activating the emergency response system ensures that professional medical help is on the way as quickly as possible.

While chest compressions are indeed crucial for maintaining blood circulation, it is important to first alert emergency services so they can arrive and provide advanced care. Simultaneously, getting an AED is vital, as it can significantly increase the chances of survival by delivering a shock to the heart if needed. The AED also provides guidance on next steps, which can aid in effective resuscitation efforts.

Checking the pulse again is not advisable at this stage because the initial assessment already indicated that there is no pulse, meaning immediate action is required without delay. Starting rescue breaths before activating the emergency response may also be inappropriate since the lack of a pulse indicates a need for compressed intervention promptly rather than an immediate focus on ventilation.