Final answer:
Continue CPR after three 'no shock' AED analyses and ensure advanced life support is on the way, as the patient may have a non-shockable rhythm like PEA or asystole.
Step-by-step explanation:
If you have analyzed a cardiac arrest patient's rhythm three times with an automated external defibrillator (AED) and have received 'no shock' messages each time, it is important to continue CPR and follow the established emergency protocols. After three cycles of AED analysis without delivering a shock, it is crucial to ensure that advanced life support (ALS) is a route if not already on the scene.
The absence of a shockable rhythm suggests that the patient may have a non-shockable rhythm such as pulseless electrical activity (PEA) or asystole, both of which require continued CPR and may benefit from medications and other interventions delivered by ALS providers.