If you have a witnessed arrest in a child, what should you do first?

In the scenario of a witnessed cardiac arrest in a child, the priority is to quickly activate the emergency response system and obtain an Automated External Defibrillator (AED). The rationale behind this step is that immediate medical intervention is critical for improving outcomes in cardiac arrest situations.

By activating the emergency response system, you ensure that advanced care is on the way. In children, the cardiac arrest is often due to respiratory issues, but if it's witnessed, immediate access to an AED is crucial because defibrillation can significantly improve survival rates. The AED will be able to provide instructions and can deliver a shock if necessary, which is key to restoring a normal heart rhythm.

Starting CPR is important, but in cases of witnessed arrests, taking the moment to call for help and retrieve an AED is often prioritized to ensure that emergency medical services are en route while you prepare to intervene immediately. It underlines the necessity of having advanced measures ready in conjunction with CPR. Simply checking for responsiveness may not be adequate, as it can waste precious seconds where immediate action could be taken.