During CPR for adults, how often should ventilations be provided?

During CPR for adults, the guideline is to provide two rescue breaths after every 30 chest compressions. This ratio is a standard practice that aligns with current resuscitation guidelines, emphasizing the importance of maintaining adequate blood circulation through compressions while giving oxygen to the lungs.

The rationale behind this approach is to maximize the effectiveness of chest compressions while still ensuring that the patient receives sufficient ventilatory support. Ventilations delivered at this ratio allow for maintaining oxygen levels in the blood without significantly disrupting chest compression's critical role in promoting blood flow to vital organs.

In contrast, other options do not align with established CPR protocols. For instance, providing ventilation every 15 compressions could result in less effective circulation due to the increased interruption of compressions. Additionally, ventilating once every minute would provide significantly less oxygen than needed for effective resuscitation, and ventilating only after each pulse check may lead to unnecessary delays in critical life-saving efforts.