Final answer:
The correct ratio of compressions to breaths when using an AED after delivering one shock is cycles of 30 compressions and one breath.
Step-by-step explanation:
The correct ratio of compressions to breaths in CPR when using an AED after delivering one shock is:
- Cycles of 30 compressions and one breath
After delivering one shock, you should immediately resume CPR with cycles of 30 chest compressions followed by one breath. This is the recommended ratio for single rescuers when using an AED. It is important to continue CPR until the patient regains spontaneous contraction or is declared dead by an experienced healthcare professional.